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Agenda 06/09/2009 Item #16B 7 EXECUTIVE SUMMARY 'I~ ~IIoBf- JZuLQ 9. 3t() 9 i~ ( v-l- rs~ Recommendation to accept the Immokalee Storm water Master Plan as commissioned by the Big Cypress Basin of the South Florida Water Management District. OBJECTIVE: To accept the Immokalee Stormwater Master Plan as commissioned by the Big Cypress Basin of the South Florida Water Management District, at the request of Collier County. CONSIDERATIONS: The Big Cypress Basin of the South Florida Water Management District developed a Stormwater Management Master Plan in 2005 for the Immokalee area to address flooding and water quality concerns. H. W. Lochner, Inc. was contracted to conduct this study. The study involved an analysis of problems and needs, data collection, hydrologic and hydraulic modeling, water quality analysis, evaluation of alternative solutions, initial cost estimates, and development of a recommended alternative. The problem areas that were identified included the following: · Fish Creek Ditch - Inadequate storage capacity and conveyance, ditch banks significantly eroded · Lake Trafford Road Ditch - Inadequate capacity, existing undersized culverts that create upstream flooding and standing water conditions · Slough Conveyance - Inadequate capacity of existing road crossings and flooding · Main Street/5th Street area - Flooding · Immokalee Drive area - Flooding · Market Street/Madison Avenue area - Flooding · Water quality issues The consultant developed four alternatives to present to the Immokalee Community Redevelopment Agency (CRA) Advisory Board. These alternatives were presented to the Advisory Board at the public meeting on March 2, 2005. The Advisory Board selected alternative four as the best option and recommended the consultant move forward with the conceptual design. The total cost for the recommended alternative is $6,109,065. The recommended alternative identifies improvements in the following areas: · Madison Ditch - The proposed improvement includes dredging of the ditch to a minimum of I foot. · Slough - The proposed improvements include installing two additional circular pipes under Sanitation Road, two circular pipes under the next crossing to the west, and one circular pipe at the third crossing to the west. · Lake Trafford Road and Fish Creek - The proposed Lake Trafford Road improvements include installing elliptical pipes for all driveway culverts. The proposed Fish Creek improvements include upgrading the cross section from Lake Trafford Road to a proposed 5 acre lake to the north (1/2 mile). ~4-eVtA- ~.. \ Co 81 ?:f . d 0+ ,~S- · Immokalee Drive - The proposed improvements include a combination of solid pipes and exfiltration trenches interconnected to an outfall control structure. · Downtown Immokalee - The proposed improvement includes alignments of solid pipes and exfiltration trenches that are interconnected to a control structure and construction of a five acre lake. During 2005 to 2008 the Collier County Stormwater Management Section completed work on three (3) separate, previously planned and prioritized projects in the Immokalee area. These projects were: · Farm Worker Village Box Culvert Improvements · Fish Branch Creek Box Culvert Extension · Fifth Street Ditch Enclosure With these projects now complete County Stormwater can begin work on the new planned improvements detailed in the Immokalee Stormwater Master Plan. Prioritization and planning can begin now with construction programmed in phases. The master plan will need to be updated as part of this effort; specifically the project 2005 conceptual cost estimates as well as the funding source analysis detailed in Section 8.0 of the master plan Alternative Analysis will need to be revised. The Immokalee CRA has commissioned Guardian Community Resource Management, Inc. to prepare a summary of potential funding sources to implement the future projects. An analysis of the ultimate storm water outfall location and adequacy, along with any anticipated real property acquisition or easements rights necessary will also be undertaken as part ofthe plan updates. FISCAL IMPACT: There is no immediate fiscal impact with Board acceptance of this master plan. The FY 2010 Storm water Management budget (Fund 325, Project No. 51013) includes $200,000 allocated for commencement of design and permitting on one of the master plan's proposed improvement projects and plan updates. The Immokalee CRA has $200,000 currently budgeted to contribute toward design and permitting. LEGAL CONSIDERATIONS: This item has been reviewed and approved by the County Attorney's Office, is not quasi-judicial and requires no ex parte disclosure, requires only a majority vote for approvaL and is otherwise legally sufficient for Board action.-SRT GROWTH MANAGEMENT IMP ACT: The Immokalee Stormwater Master Plan is in accordance with the goals and objectives of the Drainage Sub-element of the Growth Management Plan for Collier County Storm water Management. RECOMMENDA TION: Recommendation that the Board of County Commissioners accept the Immokalee Stormwater Master Plan. Prepared by: Brandy Otero, Operations Analyst, Stormwater Management Section Attachments: (1) Immokalee Stormwater Master Plan Summary; (2) Alternative Analysis; (3) Summary of potential funding sources. COLLIER COUNTY BOARD OF COUNTY COMMISSIONERS ~J1It *1 tot; 1- r:M , 3 uf /3s- IC/J. em Number: 16B7 Item Summary: Recommendation to accept the Immokalee Stormwater Master Plan as commissioned by the Big Cypress Basin of the South Florida Water Management District and approve staffs approach to update the plan. Meeting Date: 6/9/2009 9:00:00 AM Prepared By Brandy Otero Planning Tech Date Transportation Services Transportation Planning 4/27/20094:57:04 PM Approved By Caroline So to Administrative Assistant Date Transportation Services Transportation Engineering and Construction 4/28/2009 2:44 PM Approved By John Vliet Roads Maintenance Superintendant Date ...:z:...ansportation Services Road Maintenance ."proved By 4/29/2009 10:03 AM Gerald Kurtz Senior Engineer Date Transportation Services Stormwater Management 4/29/2009 1 :50 PM Approved By Scott R. Teach Assistant County Attorney Date County Attorney County Attorney Office 4/29/2009 2:12 PM Approved By Penny Phillippi Immokalee, CRA Date Bec County Redevelopment Agency 4/29/2009 4:48 PM Approved By Therese Stanley Grants Coordinator Date Transportation Transportation Administration 5/11/2009 2:52 PM Approved By Najeh Ahmad Director Date Transportation Services Transportation Engineering & Construction Management 5/12/2009 9:31 AM - 'proved By _~ff Klatzkow County Attorney Date County Attorney County Attorney Office 5/14/2009 11 :50 AM file:/ / /CJ/.. .NSENT%20AGENDN16B. %20TRANSPORAllON%20SERVICES/16B7 /16B7%20Electronic%20Approval%20Page.html[6/3/2009 6:31: 15 PM] Approved By Pat Lehnhard Executive Secretary Date Transportation Services Transportation Services Admin 5/14/200912:47 PM Approved By OMB Coordinator OMB Coordinator Date County Manager's Office Office of Management & Budget 5/14/2009 4:25 PM Approved By Mark Isackson Budget Analyst Date County Manager's Office Office of Management & Budget 5/1512009 3:04 PM Approved By Susan Usher Senior Management/Budget Analyst Date County Manager's Office Office of Management & Budget 5/19/20094:57 PM Approved By Norm E. Feder, AICP Transportation Division Administrator Date Transportation Services Transportation Services Admin. 6/212009 2:07 PM Approved By Leo E. Ochs, Jr. Deputy County Manager Date Board of County Commissioners County Manager's Office 6/2/20094:43 PM y~1ejtl q-i~llo 61- Pj . c/ ,)-t I '5S file:! / /Clf. ..NSENT%20AGENDN 16B. %20TRANSPORA TION%20SERVICESf16B7 f16B7%20Electronic%20Approval%20Paqe. htmlr6/3/2009 6 :31: 15 PF- ~~/0B+- fX3 CS cl {' I 3:=: Immokalee Area Stormwater Management Master Plan Summary I . Project Background In 2005-2006, the Big Cypress Basin in partnership with the Collier County developed a Stormwater Management Master Plan for the Immokalee area under contract with the consulting engineering firm H. W. Lochner, Inc. The urban growth in Immokalee has occurred mainly on the high ground areas east of Lake Trafford and the town is likely to experience further growth in the near future. The existing drainage system in several areas, consisting in open ditches in its majority, is inadequate and has been the reason of significant seasonal flooding in the past. The historical wetland flow paths have been disrupted by development and the flow of surface water through the slough south of Immokalee has been reduced. There are several areas where flooding and stormwater conveyance present safety risks due to open ditches and poor water quality. Since the future growth is expected to produce additional stormwater management problems, this study is an attempt to provide an evaluation of the existing and future stormwater management requirements for the Immokalee area. The study area covers the Immokalee urban area, as defined in the Collier County Growth Management Plan and adjacent areas that may be affected by implementation of the proposed elements. II. Scope The study involved initial investigations on problems and needs, data collection and hydrologic and hydraulic modeling, water quality analysis, evaluation of alternative solutions, initial cost estimates, and development of a recommended plan. III. Findings and Problem Areas The following problem areas that were identified are listed in the order of most concern: · Fish Creek Ditch - Inadequate storage capacity and conveyance, ditch banks significantly eroded · Lake Trafford Rd. Ditch - Inadequate capacity, existing undersized culverts that create upstream flooding and standing water conditions · Slough Conveyance - Inadequate capacity of existing road crossings and flooding · Main Street / 5th Street Area - Flooding · Immokalee Drive Area - Flooding · Market Street / Madison Avenue Area - Flooding I -:r=:kv-~ {108:; ~ " ~. o-L-l'35 . Water Quality Issues - Surface water exceeds regulations for Ammonia (NH3), E. Coli (EC), Total Phosphorus (TP) and Total Suspended Solid (TSS) IV. Alternatives Based on the benefit expected and the recommended level of service four alternatives were developed, and presented to the Immokalee Master Plan and Visioning Committee at the public meeting on March 2, 2005. The alternative 4 was selected as the best option for flood protection and water quality improvements, and recommended for,conceptual design and implementation. V. Conceptual Plan The recommended alternative identifies five improvements areas as follows: 1. Madison Ditch Dredging (Fig. 1) The ditch is located at northeast side of the Madison Avenue. The proposed improvement includes dredging of the ditch to a minimum of i-foot to match acceptable depth as the ditch approaches the Airport Canal. The dredging limit is indicated by the blue line shown in Fig.1 along Madison Avenue. 2. Slough Cross-Drain Additions (Fig. 2) The proposed improvements to the slough include the installation of two additional circular pipes (48J1) under Sanitation Rd., two circular pipes (50Jl) under the next crossing to the west, and one circular pipe (72J1) at the third crossing to west. The improvements will increase the conveyance capacity of the existing crossing and the water level equalization of the interconnected wetlands. 3. Lake Trafford Road and Fish Creek Improvements (Fig. 3) The proposed improvements along Lake Trafford Road includes the installation of elliptical pipes (14J1x23J1) for all driveway culverts to increase conveyance capacity, decrease head losses and achieve safer water depths. The locations of the crossings are shown in red in Fig. 3. The modification of the Fish Creek includes upgrading of the cross section for a half mile segment from Lake Trafford Road to a proposed 5-acre impoundment lake to the north. The proposed cross section will relocate the top of bank 5 ft away from the creek center line to increase conveyance and to provide more stable side-slopes. 2 ~~~ ((nf:5i-- ~~ . q b-t I~'S 4. Immokalee Drive Improvements (Fig. 4) The Immokalee Drive area is a highly impervious basin with no water quality treatment and runoff discharged directly to the slough. The proposed system is a combination of solid pipes (48") and exfiltration trenches (18") interconnected to an outfall control structure. The control structure will be located at a suitable elevation that allows the system to hold back the treatment volume in the ditches and exfiltration trenches before overflowing to the slough. The structure will located at the southern end of Wells Street adjacent to the slough. 5. Downtown Improvements (Fig. 5) The 5th Street basin has almost not water quality treatment system and runoff will be discharged directly to the slough. The proposed system includes alignments of solid pipes (48" and 24") and exfiltration trenches (18") that are interconnected to a control structure located at the southern end of the 5th Street ditch adjacent to the slough. The improvement includes also a 5 acre lake at the north east corner of Eustis and 9th Street. The proposed system will provide water quality and reduce high discharges into the slough that will prevent flooding in adjacent basins such as the Indian Reservation. VI . Preliminary Cost The total estimated cost presented at the BCB Board on December 08, 2005 for the recommended alternative is $ 6,109,065 (2005 Dollars). Phase Right of Way Acquisition (15 acres) Design and Community Awareness Plan Construction Survey Permitting Construction Engineering Inspection Total $1,500,000.00 $ 517,788.49 $3,521,821.26 $ 17,000.00 $ 98,652.72 $ 453,802.52 $ 6,109,065.00 VII. Conceptual Permitting The H.W. Lochner team, Collier County Staff and BCB Staff met on August 9, 2005 at the BCB Office with the environmental resource permitting agency (Mr. William Foley, SFWMD) to discuss permit application procedures. The conceptual plan was updated to incorporate comments derived from the meeting. It was indicated that the presented conceptual plan can be permitted as a single permit for the entire project. 3 :cAe lA^::({ ( to 61 1XJ.8 of I ~S" VIII. Project Products The following items were delivered to Collier County and BCB as the product of the project. . Drainage Basin Boundary Delineation Map . Land Use Information Map . Property Ownership Map . Composite Soils Map . Wetland Inventory Map . Wetland Flow ways Map . Existing Permits Index Report . Detailed Field Surveying . Condensed Topographic Contour Map . Environmental Assessment Map . Survey of Existing Topographic . Survey of Existing Facilities . Water Quantity Modeling and Water Quality Technical Report . Level of Service Technical Memorandum . Level of Service Deficiency Table (GIS Theme) . Environmental Evaluation Report . Flood Control Improvement Plan (FClP) Memorandum . Wetland Flow way Improvement Plan Memorandum . Water Quality Improvement Plan . Alternative Analysis Evaluation . Preliminary Opinion of Probable Construction Cost . Conceptual Design Plans IX. Next Phase Since the proposed plan is four years old now, it needs to be updated in order to accommodate changes that have occurred in the drainage system after completion of the study. The proposed plan is a concept although sufficient preliminary engineering information has been provided. For most of the proposed improvements final design plans and specs will be required to be developed for construction. The permit application process should be started as a single permit for the entire project. 4 ~l-{-lloE, 1- ,f) ~j1.A- '#-l ~ -61- X\ , (D ~ 15 5- .1 '''fIc.'''~ . ..~-;~-,~--,. I.:I\,;;.......'.:~.; ',J. . I, "".I J .,f ~ " i' 'f;;..;J :.;;:!:':'~1" ~I...!;" -:G~~Co~. . (( 0 + /3S ~f~(b~+- ~....... ' Ie 61_~~3s- '. '1~.' C.,l, . . "'. ',,(. .. ./ \........ . . "1'; .,.......... .( c;~L ,. '''f ..........- '. . ftl '.~~ ~~(~&: , l ~ 0-1:- ,~S- ~LL {t-( (061--- P3' \L{ 0-\ 135 IMMOKALEE STORM WATER MANAGEMENT PLAN FUNDING SOURCES A large majority of the funds provided under The American Recovery and Reinvestment Act (ARRA) of 2009 have been allocated through existing federal programs, formulas and competitive grants. The following identified programs have received funding through ARRA. These programs are all potential funding sources for the services, material and labor required to complete the work as described in the Alternative Analysis #4 of the Immokalee Storm Water Management Plan prepared by H.W. Lochner, Inc. This is not a shovel ready project and so will be more focused on allocations to regular programs or second round stimulus funding. This program will not be displacing any shovel ready priority projects already approved by the BCC. A brief description of the project is reflected below followed by a summary of each funding source. Immokalee Stormwater Proiect Summarv The objectives of this project are to increase drainage, reduce seasonal flooding, provide flow diversions and water treatment facilities in four areas in Immokalee; Downtown, Western Lake Trafford Road, Sloughs west of Sanitation Road and Fish Creek just north of Lake Trafford Road. When these goals are met, water quality will be improved, streets will not flood, the people will be safer and existing ecosystems will be improved. Enhancements to the existing drainage system will be made with culvert upgrades, additional cross-drains, exfiltration trenches, two (or three) water quality control structures, the lengthening and widening of Fish Creek, installation of forty-eight inch stabilization pipes and a storm and water quality control pond. With the lengthening and widening of Fish Creek, the elementary school children in the area should no longer have a problem accessing playgrounds and the school entry. Frontage business developers along Madison Avenue would now have a storm and water quality control pond in the rear of the businesses rather than a ditch in the front. Also, the relocation of the ditch on Lake Trafford road will lessen the impact on the Indian Reservation. Fundin2 Sources in Summarv The State Revolving Fund (SRF)- Water Pollution Control SRF Eligible project sponsors include counties and special districts responsible for stormwater management and estuary protection. The Florida Department of Environmental Protection (FDEP) solicits project information each year and uses this information to establish project priorities for the following annual cycle. All required documentation should be submitted prior to June 1. Please note there is a thirty day public hearing process. Funds are made available in the form oflow-interest rate Preconstruction Loans and low-interest rate Construction Loans. The Preconstruction loans are available to all communities and provide up-front disbursements for administrative services, project planning and project design. Project funding amount determined by grantor agency. Prepared by "es ~~(~{3-; P5 . l\"H 1"?5 Funds are made available as projects are submitted and approved. Prudence dictates urgency in making application for FY201 0 funding under this opportunity as local FDEP contacts advise projects are "rolling in the door". Information about this program, required documentation and guidance may be found at: http://www.dep.state.fl.us/v..<lter/wff/cwsrf/index.htm Section 319 Grant Fundill!! These funds are awarded to local governments to diffuse nonpoint source pollution, such as stormwater runoff from urban areas and agricultural operations. Approved projects are contracted with the Florida Department of Environmental Protection (FDEP) and managed by the staff of the Nonpoint Source Management Section. Please note the grant funds water quality improvement, not flood control. This grant requires a 40% applicant match of non-federal funds. Grant funds are administered on a cost-reimbursement basis. The grant period is four years. Project proposals are due to the FDEP for review and ranking by May 22,2009. The FDEP submits a draft "work plan" containing selected proposal to the Environmental Protection Agency (EPA) for review and comment on August 31,2009. Applicants receive notification of the status of their proposals from FDP during September 2009. The EP A anticipates the awarding of funds to applicants during the summer of201O and FDEP initiates work and contracting with grantees simultaneously with grant award. Funding amount determined by grantor agency. Project funding is divided by EP A into two categories: "base" and "incremental". Base funding is more limited. Projects identified as "comprehensive watershed plans" will be eligible to be considered for incremental funding. If the project has a Storm Water Master Plan, it may be considered for incremental funding. To view the nine elements the EP A uses to define a comprehensive watershed management plan, please visit: http://www.dep.state.fl.us/water/nonpoint/319h.htm United States Department of Af!riculture Rural Development (USDA RD) Grant/Loan The Rural Development Division of USDA provides Water and Environmental Programs provides loans, grants and loan guarantees to public bodies through its Water and Environmental Programs (WEP) for storm water projects in rural areas. Project eligibility is determined after project application is filed with area USDA RD office (West Palm Beach). Both grant and loan funds can be used for construction, land acquisition, legal fees, engineering fees, capitalized interest, equipment, initial operation and maintenance costs, project contingencies and other cost that is determined by USDA RD to be necessary for the completion of the project. According to USDA RD representative, once application is made, if approved and underwritten, it is possible for funding to occur within six months to one year. Funding amount determined by grantor agency. Criterion used for loan/grant ratio and loan interest rate is based upon population in the service area. Also, the median household income (MHI) of resident in the service area as it relates to being greater than or less than the non-MHI of Florida ($28,470). 2000 Census Data will be used to determine service area population and MHI. Approximately 45% or more of the Prepared by CfN ~*t loG +- P5 < t to c{ 135 grant/loan ratio would be grant funds. The loan, if based on median figures would bear 4.125% interesttoday. The repayment terms of the loan would be up to 40 years based on the applicant's authority and the useful life expectancy of the system. Approval of the project must be reflected in the County Comprehensive Plan and/or the County must have an approved Storm Water Management Plan (SWMP), a copy of either of these documents must accompany the application. All projects requiring construction must also submit a Preliminary Engineering Report and an Environmental Report. The public participation process is used when submitting application for these funds. For further information on this program and for environmental guidance, please visit: http://www.usda.gov/rus/water/ees/environ.htm US Department of Housin!! & Urban Development / Entitlement CDBG Formula grants allocated to cities and counties to service low-to-moderate (LMI) individuals. Eligible facilities include infrastructure, economic development, downtown revitalization, disaster mitigation, recreation and housing rehabilitation. Prevention of slum and blight and urgent needs are eligible. Use of funds is based upon a Consolidated Plan developed by the entitlement community and approved by HUD. Entitlement consolidated plans may be reviewed for new projects for potential leverage opportunities. The Collier County Consolidated Plan and Action Plan would need to be updated in order to include LMI areas of the Immokalee SWMP and CDBG eligible improvements. For more details, please visit: http://wW\V . h ud. gOV 1 offices/ cpd/ communitvdevel opmentlprograms/ entitlementl Municipal Service Taxin!! Units (MSTU) Community members may create, with BoCC approval, a special taxing district providing a funding vehicle to make a variety of improvements in their neighborhood or community. Improvements include drainage, roadways, sidewalks, landscapes and lighting. The Collier County Transportation Modes Department oversees the administration of the MSTU's with Board appointed advisory committee members. The committee members have the authority to approve capital improvement projects under their enabling Ordinance. The Immokalee Beautification MSTU covers the Immokalee downtown area and might be expanded or combined with one of the other Immokalee area MSTU's to provide a source of leveraged funds with grant options or pledged revenues for USDA RUS Loans and/or State Revolving Fund (SRF) loans. Tax Increment Financin!! (TIF) TIF is a fiscal tool that allows local governments to "self- finance" a broad base of economic development and capital projects, i.e. activities such as acquisition, development, rehabilitation, infrastructure improvements and building expansion. Officials may tap into their local property tax base without imposing a new tax, or higher tax rate. A special tax increment district is created, in this instance the Immokalee Community Redevelopment Agency. The base year is set at the beginning of the project, usually the year the Prepared by Ge, ~ ~'Cn69-- ftJ ~ (7- crt- ( -3~ Special tax district is adopted. The assessed valuation of property located within the special district is frozen at the base year. The tax revenue generated from the base year value belongs to all the taxing districts in the special district. After the base year, all revenue generated on the assessed value above the base value belongs to the special district. At the time the special district is terminated, the tax revenue generated from the incremental assessed value would then return to all the taxing districts in the special district. nF would provide a source of leveraged funds with grant options or pledged revenues for USDA RUS Loans and State Revolving Fund (SRF) Loans. South Florida Water Mana2ement District lSFWMD) / Bi2 Cypress Basin SFWMD funded the Storm Water Management Plan. The Big Cypress Basin Board might be approached by SFWMD to make a budgetary award for this stormwater project from district taxes. Immokalee is located near Lake Trafford. The Lake Trafford Restoration Project cost $10.4 million dollars. The reduction of bacteria, nutrients and suspended solids from Immokalee basin stormwater would have a significant effect on helping to maintain a restored Lake Trafford. Additionally, another final destination for water leaving the Immokalee watershed basin area is SR 29 canal and that water eventually flows into the Gulf of Mexico. Less Immokalee stormwater runoff, less bacteria, etc. and less fresh water pulses into the Gulf estuarine wetland system. u.S. Treasurv Department Build America Bonds A new financing tool for state and local governments by lowering borrowing costs. Capital projects such as transportation infrastructure, water and sewer projects and public utilities. The Treasury will subsidize 35% of the interest payment on these bonds thus allowing lower net borrowing costs and enable the state and local government the ability to reach more sources of borrowing. For example, if a state or local government were to issue Build America Bonds at a 10% taxable interest rate, the Treasury Department would make a payment directly to the government of3.5 percent of that interest, and the government's net borrowing cost would thus be only 6.5 percent on a bond that actually pays 10% interest. For more information on the issuance of Build America Bonds, please view the following link. http://www .irs. gov /pub/irs-drop/n-09-26. pdf Economic Development Administration. Department of Commerce lEDA) Public Works Fundin2 Funds under this program are for economic development projects that might need utilities including stormwater. Economic development funds are typically for infrastructure needed to facilitate job creation and private investment. A project that meets the annual EDA policy requirements and funding goals, includes private business expansion or development with jobs and investment and needs public water, sewer, roads, gas storm water, electric, gas etc can be eligible. It is advisable to apply to your local Regional Planning Council to include this project as a planning priority and to contact the State EDA representative to discuss projects before applying to EDA. Typically, a 50% non federal match is required. For more information, please see the following link. http://www .eda. gov Ixp/EDAPubliclN ewsEvents/PressReleases/PR W ashington0311 09.xml Prepared by .'N ~~lU~ 1106~ P5' lC6 u+- (~S TABLE OF CONTENTS EXECUTIVE SUMMARy............ ..... .......... ..................... ........ ............................................................ ...................................... 3 1.0 INTR 0 D U CTI ON.............. ............. ...................... ......... ......... ..................... ........ ..... ................... ................. ................... 5 1.1. BASIN DESCRIPTION ..................... ,..... ........ .......... ...................... ,................................ .................... ,..................... ,.. 5 1.2 SUMMARY OF COLLIER COUNTY'S DRAINAGE IMPROVEMENT PLAN ........................................................ 7 1.3 SWMP OBJECTIVES AND CONCERNS IN THE IMMOKALEE BASIN ................................................................. 8 2.0 FLOOD PR OTECTI 0 N IMPROVEMENTS .............................................................................................................. 10 2.1 RESULTS OF THE LEVEL OF SERVICE FOR FLOOD PROTECTION (FPLOS) .................................................. 10 2.2 FLOOD PROTECTION AND WATER QUALITY FACILITY LOS DESIGNATION .................................................................. 11 3.0 CO MM UNITY B RIEFIN GS......... ...... .................. ....... ............. ............ ................... .................... ................ .... ............. 12 4.0 FLOOD CO NTR 0 L IMPROVEMENTS ............ ........ ............ ..... ......................... ..................... ............ ..................... 13 4.1 IMPROVEMENTS TO FLOOD PROTECTION LEVEL OF SERVICE ........................................................................................ 13 4.2 MODIFICATION TO EXISTING FACILITIES. .......... ...... .... ...................... ......,...................................................................., 14 4.3 NEW FACILITIES ..........................,. ...... ,...,..,...... ,.".. .... ...................... .....................................,........... .........................., 15 5.0 WETLAND FLOWW A Y IMPROVEMENTS ..................................................................................................................16 5.1 STORMW A TER CONVEY ANCE AND HABITAT PROTECTION ....................................................................,....................... 17 5.2 RECEIVING WATER IMPACTS AND IMPROVEMENTS......................................................................................................, 18 6.0 WATER QUALITY IMPROVEMENT PLAN ..........................................................................................................20 6.1 BASIS FOR BEST MANAGEMENT PRACTICES (BMPS).....................................................................,...,.......................... 20 6.2 WATER QUALITY IMPROVEMENTS IMPLEMENTED IJ'\ THE SWMP ALTERNATIVES ........................,............................., 20 6.3 STRUCTURAL AND NON-STRUCTURAL BMPs.......................,...............,......................................................,...' 22 6.4 MODEL PREDICTIONS ................................. ,......... ............ ...... .... ................................................. .................. ,... ...., 22 7 .0 ANALYSIS OF SWMP AL TERNA TIVES .................................................................................................................27 7 .1 ALTERNATIVE 1 ......................... '... ,...,..,.. '... ,..... ,......... .... ........ ..........,......................................,..............................28 7 .2 ALTERNATIVE 2 ............................. ,...,..,.. .... ,..,.. ,......... .... ,....... ...,..................................,..", ................... ......., .......,.29 7.3 ALTERNATIVE 3 .............................,.............................'.............................................,..........,..................................30 7.4 ALTERNATIVE 4 .......................................................................................................................................................31 7.5 PROBABLE CONSTRUCTION COST ....... ...... .............. '........... ......................................... ,... .......... ,... .....................33 7.6 RECOMMENDA TION...........,....,. ,.,. ,.,....... ,..,.. ,.."..... ..., ......., ..................................,...,...,...... ,.................................. 45 8.0 FUND IN G ANA L Y S IS .......... ...... ......... ....................... .................. ...... .......... ........... ............... ..... .......... ....................... 46 8.1 INTRODUCTION..... .... .... .... .................,................,..,.....,..."... ...,.............. ............'..............,...,...,............,... ....... .... ,......46 8.2 ECONOMIC CONDITIONS...................,..",.,......,..,..,...,.,......,...,.......,..,.......................,...,.......,......,...,....................... ........ ,.. 46 8.3 FUNDING PARAMETERS .......................... .......... .................,...,............................................. ,............................... ....... 47 8,3.1 STEP ONE: FUNDING GOAL .....,.. ,... ...,......,. ......................,................... ,.......... ,... .... .... ............................ ....,...... 48 8,3.2 STEP TWO: FUNDING SOURCES .......,..................................,.........,....................,...,...........................,.......,...... 49 8,3.3 STEP THREE: CONCLUSION ......' '.., ...,......,... .....,.."....,.................................... ,....... ..."............,.............. ......,....50 APPENDIX A: RESULTS FOR LEVEL OF SERVICE.........................................................................................................1 Table A-l: Results for Flood Protection Level of Service ...................................................................................................... 1 Table A-2: Resultsfor Water Quality Level of Service .............................................................................,.......................... 10 APPEND IX B: INDIVIDUAL PHYSICAL CO MPONENTS .................................................................................................. 1 APPENDIX C: WATER QU ALITY RESULTS ....................................................................................................................... 1 APPEND IX D: HYD R OG RAPH RESULTS..... ........................ ......... ............. .... .......... .................. ....... ........... ......... ......... ...... 1 LIST OF FIGURES SFWMD & Collier County Immokalee Storm Water Management Plan ~\ k-vlA- ~ (~g,1 tJs' (0, ~+ /3:5 LOCHNER Alternative Analysis Figure 7-4 Immokalee Improvements Alternative # 4 LIST OF TABLES Tables 6.4,1: Water Quality Change (Total Suspended Solids) Tables 6.4.2: Water Quality Change (Total Ortho-Phosphate) Tables 6.4,3: Water Quality Change (Total Nitrogen) Tables 6.4.4: Water Quality Change (E. Coli ) Tables 6.4.5: Water Quality Change (Total Ammonia) Table 7-1 Flood Protection Level of Service (FP-LOS) Table 7-2: Probable Construction Cost I~ SFWMD & Collier County Immokalee Storm Water Management Plan '~~((Q64- ~ .d-o ~ 13S- LOCHNER Alternative Analysis EXECUTIVE SUMMARY This report presents the development of stormwater management planning (SWMP) alternatives for the Immokalee Basin Area, under existing and future land use conditions. These alternatives have been developed based on the quantitative computational model developed under this project, and documented in the Task 3.2 report [Lochner, 2004]. Specifically, the following items are presented in this report: . The establishment of a Level or Service for Flood Protection (FP-LOS) and Water Quality (WQ-LOS) of the Immokalee SWMP Basin (Section 2). . Documentation of the first Community Briefing for this project, which took place on March 2, 2005 (Section 3). . A plan for flood control improvements in the Immokalee SWMP Basin (Section 4). . A plan for wetland flow-way improvements for the Immokalee SWMP Basin (Section 5). . A plan for water quality improvements for the Immokalee SWMP Basin (Section 6). . A description and evaluation of SWMP alternatives, including detailed descriptions of the physical components of each alternative proposed, and cost estimates (Section 7). . An introductory analysis of funding sources for the proposed SWMP alternative improvements (Section 8). This item is the subject of detailed discussion under Task 6 of this project. FP-LOS problem areas correspond to locations where the computed safe depth, Le., the difference between the reference elevation and the model computed water stage is negative, implying that the water stage is above the reference elevation. As a conservative approach, the maximum water stages corresponding to each model node for the SFWMD design event storms (5-yr 24-hr, 10-yr 72-hr, 25-yr 72-hr and 100-yr 72-hr) have been used as the water stages to compute the safe depth from flooding. The safe depth computations suggest that the majority of flooding problems will occur along Fish Creek, with some limited and localized flooding problems occurring in the urbanized portion of the watershed, particularly along Immokalee Road and Main Street. These should be priority areas for flood protection control measures under the design phase of this SWMP effort. With respect to wetland flow-way improvements, we have provided complete mapping of wetland limits and establish wetland type, quality, and viability. Digital photographs provided by FOOT and black line and infra-red images provided by the SFWMD and BCB were utilized for regional mapping. Where needed, state and federal wetland jurisdiction lines were determined according to the methodologies established in Chapter 62-340, Florida Administrative Code and the Corps of Engineers Wetland Delineation Manual, Technical Report Y-87-1. Mapping of jurisdiction lines and/or potential impact areas were located via GPS. Wetland vegetation communities were identified using FOOT's Florida Land Use, Cover and Forms Classification System (FLUCCS). Wetland quality was assessed by collecting both historic and current information, including comparison of available aerial images, hydrologic information, and existing reports. Data relative to water elevations, hydroperiod, h- SFWMD & Collier County Immokalee storm Water Management Plan ~*{bt3:t-- lB . d-' o-f 155' LOCHNER Alternative Analysis vegetation stress, and encroachment by exotic vegetation was collected and opportunities for restoration are presented in this report. The methodology used in the development and evaluation of SWMP alternatives for the Immokalee basin is based on the modeling of impacts of the SWMP components. The XP software version of the United States Environmental Protection Agency's (USEPA) Stormwater Management Model (SWMM) RUNOFF and EXTRAN modules were used for the hydrologic and hydraulic evaluations, respectively. Water stages, concentrations of pollutants of concern, and peak discharge were evaluated for the following SFWMD design storms: 5-yr/24-hr, 10- yr/72-hr, 25-yr/72-hr and 100-yr/72-hr. The SWMP alternatives analyzed in this section are detailed in this report. The improvements to water quality parameters for each proposed SWMP alternative was quantitatively assessed through detailed evaluations of model results. These results provide general indications of possible water quality issues that may arise in the future. This report evaluation relies on the water quality predictions from the 5-year storm rather than longer duration storms because the greatest water quality impact would be in the early portion of the storm. In terms of regulatory standards, the model predicts that two of the four pollutants, E. Coli and TP04 will be of concern in the future. This will have to be tested to confirm model results in the field. In consultation with the SFWMD and the Collier County Board during the community briefing that took place on March 2, 2005, we recommend Alternative 4 for the conceptual design stage of this project. This recommendation is based primarily on the fact that this proposed SWMP alternative provides the best mitigation to flood protection and water quality levels of service, as documented in this report. I~ SFWMD & Collier County Immokalee Storm Water Management Plan ~i ~',~ -L -1e.J.{.C or i b r/ "L ?q. dd-u+- 135 LOc'HNER Alternative Analysis 1.0 INTRODUCTION This report presents the development of stormwater master planning (SWMP) alternatives for the lmmokalee Basin Area, under existing and future land use conditions. These alternatives are based on the quantitative computational model developed under this project, and documented in the Hydrologic and hydraulic Water Quality Modeling (Task 3.2) report [Lochner, December 14, 2004]. Specifically, the following items are presented in this SWMP report: . The establishment of a Level or Service for Flood Protection (FP-LOS) and Water Quality (WQ-LOS) of the Immokalee SWMP Basin (Section 2). . Documentation of the first Community Briefing for this project, which took place on March 2, 2005 (Section 3). . A plan for flood control improvements in the Immokalee SWMP Basin (Section 4). . A plan for wetland flow-way improvements for the Immokalee SWMP Basin (Section 5). · A plan for water quality improvements for the Immokalee SWMP Basin (Section 6). . A description and evaluation of SWMP alternatives, including detailed descriptions of the physical components of each alternative proposed, and cost estimates (Section 7). . An introductory analysis of funding sources for the proposed SWMP alternative improvements (Section 8). This item is the subject of detailed discussion under Task 6 of this project. The modeling tool utilized for the development of flood control, wetland flow-way and water quality SWMP improvements is the XP-SWMM computer program version 9.14 licensed by XP- Software Inc; which builds upon the Storm Water Management Model (SWMM). SWMM was developed by the United States Environmental Protection Agency (EPA) and has been broadly recommended for use in SWMP projects throughout the country. XP-SWMM offers enhancements to EPA-SWMM including an easy to use graphical interface and enhanced solution algorithm(s). The XP-SWMM computer model was calibrated and verified using the South Florida Water Management District (SFWMD) database of 15-minute interval flow, headwater stage, and tail-water stage data at four stage gages within the Immokalee SWMP Basin, as documented in Lochner's Task 3.2 report. 1.1. BASIN DESCRIPTION The basin area of this SWMP corresponds to the Immokalee urban area as defined in the Collier County Growth Management Plan (CCGMP, 1999). The study area is depicted on Figure 1-1. Immokalee is a small urban area in north central Collier County. Urban development has occurred on the high ground of the Immokalee island east of Lake Trafford. Although there are some areas of town with good drainage, many areas have had inadequate drainage for decades. As the town has expanded, drainage of the older areas as well as inadequate drainage in the newer areas has resulted in seasonal flooding. The historical flow paths for rs- ~~~{fB~ Sil.... ~ ::n ~o ~ !:l :n 0 !:lIO g ~ ~i:I : C) a: ~i2 CD' ~ III ~Im CD CI) ~ iit ~1:D a- m lit ~ ~ . ~ ..().., ~ .. > -V-t: ~ .... 0 . . 'tl (') :!: III ... ::t ... 0 s :;) ... 0 ... .... ... 3' '" :3 0 ~ if CI) ~ "tI :b iil III . 0 .... CI) 2' ~ SFWMD & Collier County Immokalee storm Water Management Plan ~~* I f.a61- 1?q. d~ rrC l3'5 LOCHNER Alternative Analysis runoff in lmmokalee have been disrupted by development. The flow of water through the slough south of Immokalee has been reduced and the runoff has been diverted into the Barron River Canal. Future growth is likely to produce additional flooding. There are several areas where flooding and stormwater conveyance present safety risks due to open ditches and poor water quality. Detailed maps of the lmmokalee SWMP Basin, including the general terrain slope, land cover and soil characteristics have been documented in the Task 3-2 report under this contract [Lochner, 2004]. The Immokalee Urban Area is likely to experience substantial growth in the future as the available land near the coast is developed. This report is part of a stormwater master plan effort for the area, to protect human health and welfare from nuisance flooding, enhance environmental resources and protect water quality in Lake Trafford. The Immokalee urban area is a large portion of the Lake Trafford Watershed and there is currently is no water quality treatment for stormwater runoff before it enters streams flowing to the lake. It is also requires facilities for the treatment of stormwater runoff. This SWMP has identified the main water quantity and quality conditions and needs in the Immokalee basin. This SWMP provides estimates of the impacts of existing and future land uses on flood protection and water quality, and identifies infrastructure and management strategies to accommodate these uses. The SWMP is prepared consistent with Florida Statutes 403.0891; the Surface Water Improvement and Management Act (Chapter 87-97) and Rule 62-43.035; F.A.C., State Water Policy (Chapter 62-40,404); U.S. Environmental Protection Agency (USEPA) National Pollutant Discharge Elimination System (NPDES) requirements; SFWMD rules; and the Collier County Growth Management Plan prepared pursuant to the requirements of Rule 9J5 F.A.C., Chapter 163 Florida Statutes in effect at the start of this project. 1.2 SUMMARY OF COLLIER COUNTY'S DRAINAGE IMPROVEMENT PLAN A Collier County-wide Stormwater Master Plan was prepared in 1988. The Master Plan reflected a broad watershed planning philosophy, as well as a scope of service for detailed individual basin studies with a multi-disciplinary objective of appropriate land use and natural resource management as well as traditional flood protection. The Master Plan study was used to develop the drainage sub-element of the County's Growth Management Plan. The Collier County's Growth Management Plan, "Drainage/Stormwater Management Sub- Element", was prepared to meet the requirements of Chapter 163, Florida Statutes and Chapter 9J-5, Florida Administrative Code. The document proposes a plan, through stated goals, objectives, and policies, to unify and implement the County-wide Stormwater Management Plan that provides an acceptable level of service for stormwater controls and environmental management objectives. Through the Growth Management Plan, both the government leadership and the general public are able to stay informed and provide input into the process of refining or altering program goals. The goals, policies and objectives of the Growth Management Plan are carried out through the County's Land Development Code. ~ SFWMD & Collier County Immokalee storm Water Management Plan -:c~ ~ I ~ '7.J- 1J>3 -d ~~. (3'5' LOCHNER Alternative Analysis In 1996, the Big Cypress Basin Board initiated a follow-up master planning effort called the Big Cypress Basin Watershed Plan. This Watershed Plan is being developed in cooperation with the City of Naples and Collier County at a much greater level of detail by incorporating detailed surveying, field data measurements, and computer modeling for preparing detailed basin and sub-basin stormwater management/environmental resources studies. The Watershed Plan is responsive to Florida's evolved stormwater management philosophy incorporating the water resource needs of both human populations and the existing ecosystem. It is important to note that as state and county drainage requirements evolve, as has been the case in Collier County over the past decade, drainage systems that were designed for a past standard do not perform to newer requirements. This poses the need for upgraded SWMP facilities and infrastructure which are part of the plan subject of this project. 1.3 SWMP OBJECTIVES AND CONCERNS IN THE IMMOKALEE BASIN The SWMP object of this study is motivated by the following stormwater master planning objectives, as set forth in the scope for this project. · Evaluate the current and future stormwater management requirements for the Immokalee urban area; · Identify potential stormwater management facilities to meet the current and future needs; · Develop and present alternative stormwater management measures; · Develop the overall conceptual permit. The SFWMD, Big Cypress Basin and Collier County have previously identified stormwater management needs throughout the Immokalee SWMP Basin area as: · Inadequate drainage conveyance in the majority of areas of the basin, · Substantial future growth of urban development is highly likely to increase flooding as available coastal land is developed, · Local flooding and stormwater conveyance are causing safety risks due to open ditches and poor water quality, · Potential for improvement of water quality in Lake Trafford by treating stormwater before it enters the lake, · and to develop stormwater facilities to treat stormwater runoff (Le., Dry retention areas, Exfiltration Trenches, Control Structures, and pumps). Based on the objectives and concerns expressed above, we can outline focused criteria for the development of SWMP improvements, as follows: · Identification of potential stormwater management facilities and flow diversions, · The project has a sensitive approval process with both public opinion hearings and agency approvals, ~ SFWMD & Collier County Immokalee Storm Water Management Plan +=\eJ<< * ( to 51- ~ . J.-~ 0+ l -:S5 LOCHNER Alternative Analysis . Careful selection of modeling software that can simulate existing basin features and alternative water management strategies, simulate water quality processes, and allow for hydraulics and water quality to be conducted using an ARC/GIS input/output interface, . Compatibility with the Big Cypress Basin Growth Management Plan, · Close coordination with Big Cypress Basin and Collier County staff in regards to initial modeling, conclusions drawn from the calibration of the model, and model assumptions. ~ SFWMD & Collier County Immokalee storm Water Management Plan ~l*tbt)1- 'Fo .cl.t ~. r LOCHN~R Alternative Analysis 2.0 FLOOD PROTECTION IMPROVEMENTS 2.1 RESUL TS OF THE LEVEL OF SERVICE FOR FLOOD PROTECTION (FPLOS) This section documents the results of the level of service for flood protection (FPLOS) and water quality (WOLOS) of stormwater problem areas within the Immokalee Stormwater Master Plan (SWMP) basin, under existing conditions. These results were extracted from the SWMP model previously developed and calibrated for the Immokalee SWMP basin, and documented under Task 3.2 of this project. Table A-1 in Appendix A presents the results for the FPLOS. The results are presented as computed flooding depths with respect to a reference elevation on a node by node basis within the SWMP model developed for the basin. This reference elevation is defined as the elevation above which flooding will occur, and it will depend on the location of each model node. For instance, if the model node is located along a road, the reference elevation corresponds to the road crown; if the model node is located within a discharge structure (e.g., a weir), the reference elevation corresponds to the weir crest elevation. The locations of all XP-SWMM model nodes is shown on Figure 4-2 from the technical memorandum for Task 3.2, and attached herein under Appendix A. FPLOS problem areas correspond to locations where the computed safe depth, Le., the difference between the reference elevation and the model computed water stage is negative, implying that the water stage is above the reference elevation. As a conservative approach, the maximum water stages corresponding to each model node for the SFWMD design event storms (5-yr 24-hr, 10-yr 72-hr, 25-yr 72-hr and 100-yr 72-hr) have been used as the water stages to compute the safe depth from flooding. The safe depth computations suggest that the majority of flooding problems will occur along Fish Creek, with some limited and localized flooding problems occurring in the urbanized portion of the watershed, particularly along Immokalee Road and Main Street. These should be priority areas for flood protection control measures under this SWMP effort. WOLOS computations are presented in the form of maximum concentration of the five pollutants of concern, Le., Total Suspended Solids (TSS), Total Nitrogen (TN), Orthophosphate (OP04), Ammonia (NH3) and E. coiL These results are summarized in Table A-2 in Appendix A. This result allows us to draw some conclusions about water quality in the Immokalee SWMP basin that will allow for master planning of improvements. TSS: values of this parameter are fairly consistent throughout the basin in a range of 40-50 mg/1. These values tend to double in the urbanized portion of the area (7th Street, Immokalee Road, Airport), and decrease significantly along the slough. OP04: values of this parameter are evenly distributed through the basin at levels below 0.4 mg/l. Within this range, values of this parameter are relatively higher along Fish Creek and lower in urbanized sections of the watershed (Main St, Immokalee Rd, 7th Street). rw- SFWMD & Collier County Immokalee storm Water Management Plan ~"^ ~ l bb-=f- 1'8.68 a+ 138 LOCHNER Alternative Analysis NH3: values of this parameter are evenly distributed through the basin at levels below 0.2 mg/1. Within this range, values of ammonia increase slightly with respect to the other portions of the watershed along 7th Street. E. coli: values of this parameter present a wide range of variability throughout the basin, spanning three orders of magnitude with values less than 100,000 MPN/ml. TN: Values of this parameter tend to be below 5 mg/I throughout the watershed; concentrations are relatively higher in the eastern portion of the watershed (SR-29, Airport) and significantly lower in the Slough. The slough acts as a natural pollution attenuation system. All of the pollutants of concern are found to have decreases in their concentrations with respect to values found elsewhere in the basin. This is an important finding as it is apparent that wetlands may become an important part of SWMP water quality control measures. 2.2 FLOOD PROTECTION AND WA TER QUALITY FACILITY LOS DESIGNA TION Fish Creek: LOS 0 - Street, Yard and Structure Flooding with limited or no existing water quality measures and/or Water Supply / Recharge Benefits. Immokalee Road: LOS 0 - Street, Yard and Structure Flooding with limited or no existing water quality measures and/or Water Supply / Recharge Benefits. Main Street Ditch: LOS 0 - Street and Yard Flooding with identifiable Water Quality and/or Water Supply / Recharge Benefits. Madison Avenue Ditch: LOS C - Street and Yard Flooding with identifiable Water Quality and/or Water Supply / Recharge Benefits. 5th Street Ditch: LOS C - Street and Yard Flooding with identifiable Water Quality and/or Water Supply / Recharge Benefits. 7th Street: LOS B/C - Street Flooding with identifiable water quality and/or water supply / recharge benefits. Airport Canal: LOS A/B - Flow contained in Drainage System with significant water quality and/or water supply / recharge benefits. SR29 Canal: LOS A/B - Flow contained in Drainage System with significant water quality and/or water supply / recharge benefits. Slough: LOS C/O - Identifiable water quality and I or water supply I recharge benefits; however, the conveyance capacity of the slough itself could be improved with culvert and ditch upgrades. ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~.1i:-I~b1-- ~ . ~ct 0+ l'35 L6c~NER Alternative Analysis 3.0 COMMUNITY BRIEFINGS Please refer to section 6.0 for alternative analysis definitions. The Lochner Team met with SFWMD and Collier County. The main focus of the meeting was to present the 4 Alternatives to the Immokalee Master Plan and Visioning Committee (IMPVC). A PowerPoint presentation was presented to the board on the 4 alternatives and the following were discussed with Ananta Nath, P.E. and Dr. Max Guerra, P.E., Big Cypress Basin office, after the presentation. · There has been much flooding along Fish Creek. The school children in the elementary school situated in the Fish Creek area are having problems accessing playgrounds and school entry. · A schedule for a field visit has to be performed covering the preferred alternative solution presented to the board. · The ditch along Madison Avenue needs to be moved to the back side, behind the Frontage properties. The local developers prefer the ditch to be located behind the Frontage business and not right at the road. · The IMPVC requested that for the teams next presentation the alternate board need to show flow ways and land uses. · It was agreed that Alternative #4 is the preferred solution with more improvements added such as o changes in the location of the ditch on Lake Trafford road which decreases the impacts on Indian Reservation. o Fish Creek would be modified to eliminate inconvenience to the school children. ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~Jtr\ :#=:-l ~ 61- pC{ .~o k I~s- LOCHNER Alternative Analysis 4.0 FLOOD CONTROL IMPROVEMENTS Under Task 3.2 Hydrologic and Hydraulic modeling, we provided a comprehensive stormwater model that closely simulated the hydrologic cycle of the Urban Immokalee Area. We calibrated our model based on recorded stage data and field verification, as measured flow data was not available. After the model was calibrated, we then ran four SFWMD Florida Type II Modified design storms: 5- Year 1-Day; 10- Year 3-Day; 25- Year 3-Day; and 1 00 Year 3-Day. We utilized the SFWMD Environmental Resource Permitting Basis for Review design guidelines to establish our design rainfall depths for the watershed. From the results of these storm events, we qualitatively assigned LOS designations to the key drainage facilities located within the Urban Area. The Existing Conditions LOS can be found in Section 2.0 of this report. We then ranked these existing facilities from worst to best. The LOS designation of D being the worst case and A being the best case. This designation and ranking was very useful in determining which facilities within the watershed needed the most attention or no attention at all. The designation was not exclusive to water quantity; water quality concentrations were taken into consideration when we did our analysis. The following flood control improvements have positive effects on water quantity and quality. 4.1 IMPROVEMENTS TO FLOOD PROTECTION LEVEL OF SERVICE As indicated in Section 2.1, the target LOS to trigger the need for SWMP improvements is C. In view of this, the items that were identified are listed in the order of most concern: . Fish Creek Ditch Conveyance Capacity, . Fish Creek Basin Storage Capacity, . Lake Trafford Ditch Conveyance Capacity, . Slough Flooding, . Slough Conveyance Capacity at three road crossings, . Ponding in the Main Street 15th Street Area, . Ponding in the Immokalee Drive Area, . Ponding in the Market Street I Madison Avenue Area. Fish Creek was identified as LOS D/C based on existing elevations of nearby structure finish floor elevations, roadway crown elevations and concentrations of pollutants coming from upstream. The safe depth in the existing fish creek ditch was violated in several locations along its banks. The impact of future development (change in land use I impervious area) upstream of the Fish Creek I Lake Trafford road crossing would be very unsafe to those located within the vicinity. The Lake Trafford road ditch was identified as LOS D/C mainly from the impact of Fish Creek; however, it has very poor conveyance capacity due to insufficiently sized driveway culverts. ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~~4to61 ldJ' 31 b+ (~S LOCHNER Alternative Analysis The driveway culverts have very small diameters and are easily clogged. The effect on this facility is highly negative with the head losses taking its toll on the safe depth. During the wet season the slough can take on large volumes of water that basically sheet flow from some adjacent basins that have little to no drainage facilities to store runoff and concentrate discharges. LOS D/C was designated for the slough based on adjacent structure finish floor elevations, roadway crowns and concentrations levels of pollutants. The slough is a interconnected wetland area that needs to maintain a very delicate water balance. The design for the water levels in the slough needs to take several factors into consideration including: groundwater recharge, safe depth of water for survival of wetland aquatic vegetation and the flooding of adjacent basins. The Main Street 15th Street area is one of the higher ground basins adjacent to the slough. This Basin (B-12) has a mainline trunk drainage facility known as the 5th Street ditch (LOS C). Collier County has been working within this basin over the past few years to try to alleviate the ponding that is taking place on streets with no drainage facilities. The county has done a good job in utilizing 48 inch "Stabilizer" pipes that are interconnected to the ditches directly above them with very poor conveyance capacity. One recent county project was on Eustis Avenue where this approach has proved successful in draining this easily flooded road to the 5th Street ditch. The problem, however, with alleviating the ponding for the residents of Basin B-12 is the compounding effect of higher flows and water levels downstream in the slough. The Immokalee Drive area or Basin B-9 has the same problems of the Main Street 15th Street basin (B-12) and is located just to the east of this basin. Basin B-9 currently sheet flows into the adjacent slough with even less drainage infrastructure than Basin B-12. The Market Street I Madison Avenue area has similar ponding problems to those of Basin B-9 and B-12. Also, the Madison Avenue ditch (LOS C) is supposed to discharge into the Airport Canal, and ultimately to the Gulf of Mexico. The modeling results for Madison Avenue during larger storm events show the opposite taking place. The Madison Ave ditch is experiencing a flow reversal due to higher water levels within the Airport Canal. The Madison Avenue ditch has an acceptable depth as you get closer to the Airport Canal, but has a very poor depth for most of the length of the facility. 4.2 MODIFICATION TO EXISTING FACILITIES The calibrated XP-SWMM model developed under Task 3.2 was used to develop improvements in the in the LOS and to propose modifications to existing facilities throughout the Immokalee SWMP Basin. In the Fish Creek area, we proposed modifications to the Fish Creek ditch cross section from Lake Trafford Road to the north about ~ mile. The cross section modification was to widen and stabilize the slopes along the creek during this stretch of the ditch. Along Lake Trafford road we proposed elliptical 18 inch pipe for all driveway culverts to increase conveyance capacity, decrease head losses and achieve safer water depths. ~ SFWMD & Collier County Immokalee storm Water Management Plan -x~ it-lbf)+-- M,3G ~ (3:) '"' LOCHNER Alternative Analysis In the slough, we proposed 2 additional 48-inch pipes under sanitation road, two 60-inch pipes under the next crossing to the west and one 72-inch pipe to the third crossing to the west. These additional pipes will increase the conveyance capacity of the existing crossing and will achieve a faster water level equalization of the interconnected wetlands. The pipes are proposed adjacent to existing corrugated metal pipes. We are proposing to dredge the Madison Avenue ditch to match the acceptable ditch depth as the ditch approaches the Airport Canal. The dredging depth of one foot is a minimum depth. It should be noted that the contractor will need to maintain an acceptable side slope and will likely require the professional opinion of a geotechnical engineer to determine the slope stability of this facility before dredging the ditch. 4.3 NEW FACILITIES Half-mile north of Lake Trafford Road we proposed a 5-Acre lake with a filter marsh and control structure located within the path of fish creek's current flow direction. This required storage feature provides positive effects that lower flood stages and flows downstream and lower concentrations of pollutants downstream. In the 5th Street / Main Street area (Basin B-12), we have proposed additional 48-inch stabilizer pipes interconnected to the existing ditches directly above. We have proposed these branches off the mainline trunk (5th Street) along Boston Avenue, Delaware Avenue and Colorado Avenue. In addition to the conveyance improvements, we have proposed 18-inch exfiltration trenches along side streets to these branches to provide additional storage and water quality treatment for this basin. At the corner of Eustis Ave and 9th Street, we are proposing a 5-Acre lake with a filter marsh and control structure to provide additional storage and water treatment. At the southern end of 5th Street where the ditch outfalls into the slough, we have proposed a large control structure to release flows into the slough at a more gentler pace, while providing additional water quality treatment. In the Immokalee Drive area (Basin B-9), we have proposed interconnected an 48-inch pipe from SR 29 to the end of Wells street to allow this basin to drain more as a point source. This will help the basin to limit the sheet flow effect into the slough and will provide the opportunity to treat the urban runoff before discharge. The 48-inch pipe has connecting 18-inch exfiltration trenches providing water quality treatment. At the end of Wells Street, we have proposed a large control structure to regulate the flow and provide the additional water quality treatment before discharging into the slough. 115 SFWMD & Collier County Immokalee storm Water Management Plan -s:-~ iF-l \06"1- f4 ,~~ &t. 135 LOCHNER Alternative Analysis 5.0 WETLAND FLOWWAY IMPROVEMENTS Under Task 3.1 Data Compilation, we have provided complete mapping of wetland limits and establish wetland type, quality, and viability. Digital photographs provided by FDOT and black line and infra-red images provided by the SFWMD and BCB were utilized for regional mapping. Where needed, state and federal wetland jurisdiction lines were determined according to the methodologies established in Chapter 62-340, Florida Administrative Code and the Corps of Engineers Wetland Delineation Manual, Technical Report Y-87-1. Mapping of jurisdiction lines and/or potential impact areas were located via GPS. Wetland vegetation communities were identified using FDOT's Florida Land Use, Cover and Forms Classification System (FLUCCS). Wetland quality was assessed by collecting both historic and current information, including comparison of available aerial images, hydrologic information and existing reports. Data relative to water elevations, hydroperiod, vegetation stress, and encroachment by exotic vegetation was collected. Opportunities for restoration were noted. We utilized a two-fold wetland assessment approach in this project. This involved: 1) a remote analysis based on the interpretation of infrared aerial photographs, and 2) a field analysis using a functional assessment methodology developed by the SFWMD. Data sources included: USGS quadrangle maps, USDA (Soil Conservation Service) soil survey for Collier County, FGFWFC 1988 Landsat Thematic Mapper satellite imagery, USFWS National Wetlands Inventory, and infrared aerial photography. The first level of analysis of wetlands in the project area was carried out through the interpretation of aerial photography. This type of analysis has the advantage that it can be applied equally to all wetlands within the entire project area. This is important because of the large size project area and because the project team may not have access to all properties with wetlands. This first level of data collection was useful to evaluate and identify the locations and extent of wetlands. The second level of analysis of wetlands in the project area was carried out through field evaluations and ground-truthing of aerial photo interpretation. The advantages to ground- truthing are that additional details regarding wildlife utilization, vegetation, hydrology, and water quality function can be obtained. Ground-truthing also served to verify the types of wetland identified through individual color infrared signatures. We utilized the Wetland Rapid Assessment Procedure (WRAP) for wetland assessments, which was selected for several reasons. It has been regionally tailored for freshwater wetlands in southern Florida. It incorporates use of easily obtainable existing data, effectively addresses ecological and anthropogenic factors in wetland function, and can be conducted within an hour or two of field time. The Environmental Evaluation Report [Lochner, 2005] contains detailed maps showing the location of WRAP sites within the project area. ~ SFWMD & Collier County Immokalee Storm Water Management Plan -:L=-kvv1 ~1c2 ~1- +:q ,3'-{ u+ 13S- LOc1-iNER Alternative Analysis 5.1 STORMWATER CONVEYANCE AND HABITAT PROTECTION The surface water runoff from the Immokalee sub-basins that reaches the slough wetlands contains high levels of bacteria (e. coli) nutrients (phosphorus, nitrogen, ammonia), and suspended solids [Lochner, 2004]. Thus stormwater management plans that include hydrological restoration of the slough wetlands will also require that the stormwater be treated to reduce the bacteria, nutrient, and suspended solid load before the water is delivered to the wetlands. By using the Harper Method to calculate treatment pond size for the reduction of phosphorus levels, concurrent reductions in associated bacteria, nutrient, and suspended solids should also occur in the treatment pond. Surface water runoff from one or more sub-basins will be diverted and collected at points adjacent to the slough wetlands where it will be treated for bacteria, nutrient, and suspended solids before being used for hydrological restoration. Possible locations for such treatment ponds include: fish creek south of Lake Trafford Road, improved pasture south of Immokalee Road West, improved pasture southwest of Main Street West, and pine flatwoods south of Eustis Avenue East. Final pond site locations will be dependent on geotechnical survey data and land availability and price. As a baseline the minimum treatment pond size will be sufficient to hold a 3 day 25 year event as per SFWMD rules. Additional treatment volume will be added to the minimum treatment pond size, per the Harper Method, to achieve significant reductions in the existing phosphorus load of the stormwater run-off. Three nutrient treatment options are presented for consideration in a stormwater treatment plan for the City of Immokalee: 90 percent reduction in existing phosphorus load, 75 percent reduction in existing phosphorus load, and 50 percent reduction in existing phosphorus load. Modified WRAP scores were used to predict the improvements that would occur in the wetlands receiving additional water with reduced nutrient levels. Average WRAP scores were calculated for each of six wetland types. For each of the average WRAP scores, a single category score (e.g., wildlife utilization, wetland canopy, wetland ground cover, habitat buffer, field hydrology, water quality input and treatment) was back-calculated. A relative increase (90%, 75%, or 50%) was then calculated and added to the scores for field hydrology and water quality input and treatment. The total WRAP score was then calculated with the new single category scores. The new WRAP scores assume a linear response in field hydrology and water quality input and treatment to nutrient reduction in the stormwater treatment ponds. The single category scores for wildlife utilization, wetland canopy, wetland ground cover, and habitat buffer were not increased because these would not have a linear response to nutrient reduction and increased field hydrology. Although it is expected that wildlife and vegetation would have a positive response to nutrient reduction and increased field hydrology. Thus the adjusted WRAP scores area a liberal estimate of the field hydrology and water quality input and treatment response to nutrient reduction and increased field hydrology, and a conservative estimate of the wildlife utilization, wetland canopy, wetland ground cover, and habitat buffer response to nutrient reduction and increased field hydrology. While wet prairie, freshwater marsh, and canal/ditch wetlands show a greater response to nutrient reduction and increased field hydrology compared to wetland forested mixed, cypress, and mixed wetland hardwoods, these wetlands are a much smaller proportion of the slough ~ SFWMD & Collier County Immokalee storm Water Management Plan ~~ Ifo6l-- ~, ~ ~ 13:; L'O-cHNER Alternative Analysis wetlands compared to wetland forested mixed, cypress, and mixed wetland hardwoods (See Figure 5-1). The majority of the wet prairie, freshwater marsh, and canal/ditch wetlands are associated with citrus groves and improved pastures, and are not conducive to receiving excess stormwater from the Immokalee urban area. Thus while the improvement in wetland condition for wetland forested mixed, cypress, and mixed wetland hardwoods may not appear great, the functional improvement of large portions of these wetland types would be very beneficial to the ecological region. 5.2 RECEIVING WA TER IMPACTS AND IMPROVEMENTS The final destinations for water leaving the Immokalee basin are Lake Trafford, the slough, and SR 29 canal. The Lake Trafford Restoration Project will remove nutrient laden sediment from the bottom of the lake and pump it to a 400-acre disposal site about two miles away at a cost of 10.4 million dollars. The reduction of bacteria, nutrients and suspended solids from Immokalee basin stormwater would have a significant effect on helping to maintain a restored Lake Trafford. Using treated stormwater to increase the water stage and hydroperiod in the slough wetlands will provide a significant improvement in ecological functions. These wetlands provide multiple fish and wildlife habitats (e.g., spawning, breeding, nesting, juvenile refuge, feeding, resting, migration, etc.). Improving these habitats would have a significant effect on helping to maintain healthy sport fish and alligator populations in Lake Trafford. The water in the SR 29 canal eventually flows into the Gulf of Mexico. The benefits to fish and wildlife habitats in Lake Trafford and the slough associated with reductions in bacteria, nutrients and suspended solids from Immokalee basin stormwater, would also be beneficial to the estuarine wetlands in the Gulf of Mexico. In addition, the reduction of stormwater entering into the SR 29 canal would reduce the occurrence of freshwater pulses entering into an estuarine wetland system. hs- SFWMD & Collier County Immokalee Storm Water Management Plan r~~ J 0e--; "\JC" 3lc o~ 13c5 LOCHr\1ER Alternative Analysis Figure 5-1. Average WRAP score and total WRAP score with adjusted hydrology & water quality categories for a 50%, 75%, or 90% increase above the single score for wetlands in the Immokalee study area. .. o " ~ 0.500 ~ 3: 1.000 0,900 E:J Average WRAP Score . Total WRAP Score with 500/0 Improvement I D Total WRAP Score with 75% Improvement DTotal WRAP Score with 90% Improvement, 119 0.800 0,700 0,600 0.400 0.300 0.200 0.100 0.000 Wet Prairie Freshwater Canal/Ditch Wetland Cypress Mixed Wetland Marsh Forested Mixed Hardwoods Wetlands SFWMD & Collier County Immokalee Storm Water Management Plan ~*(tds~. f::::c\ . 3 7 ~ /35 LOC~NER Alternative Analysis 6.0 WATER QUALITY IMPROVEMENT PLAN 6.1 BASIS FOR BEST MANAGEMENT PRACTICES (BMPS) Regulatory limits for the five prescribed parameters are not all tightly prescribed. Ammonia has two primary compounds, Unionized Ammonia (NH3) and Aqueous Ammonium (NH4). Total Ammonia (NH), which is discussed in this evaluation, is the sum of these two forms of ammonia. The Florida Administrative Code (FAC) includes a value for Unionized Ammonia in Class III Fresh Water (S 0.02 mg/L). The FAC also includes limits for E. Coli, evaluated with MPN (Most Probable Number) or MF (Micro Filtration) methods. These limits include a monthly average S 200, with not more than 10% exceeding 400, and no day ~800; average values based on at least 10 samples obtained over 30 days). Among nitrogen compounds, Nitrate (which was not included in this evaluation) and Ammonia are regulated, but Total Nitrogen is not. Total Nitrogen (TN) does receive some attention because of potential impacts on vegetative development around Florida water bodies. Results of studies for the Comprehensive Everglades Restoration Plan (CERP) found that phosphorus controls much of the undesirable vegetative development in south Florida. As part of the investigation into the impact of phosphorus in the Everglades, the SFWMD determined that 10 ppb (parts per billion) is the appropriate concentration for waters in south Florida. This limit applies to the Total Ortho-Phosphate (TP04) Discussed in this evaluation. Like Total Nitrogen, Total Suspended Solids (TSS) limits reflect historical local conditions. 6.2 WA TER QUALITY IMPROVEMENTS IMPLEMENTED IN THE SWMP AL TERNA TIVES Total Nitrogen TN generally reflects the effects of fertilizer application. Control of TN concentration in natural water bodies is best affected by adjusting fertilizer use. The BMP's described in this study will not change the TN concentrations. Total Suspended Solids TSS responds to river discharge and water velocity. The BMP's described in this report include adjustments to discharge and river velocity in the form of dams and culverts. TotalOrtho-Phosphate TOP4 variations in surface water have been demonstrated in Storm Water Treatment Areas (ST A's) adjacent to the Everglades. Studies in the ST A's indicate that passing the water through vegetation stands such as algae reduces TP04 concentrations to acceptable levels. Addition of ho SFWMD & Collier County Immokalee storm Water Management Plan ~V'1 #( b6--:J- '1:0 ' -?:>g ~+ '3~ LOC"-H N E R Alternative Analysis wetlands with appropriate vegetation to the improvements recommended in this report could reduce phosphorus in the Immokalee area. E.Coli E. Coli is highly variable and difficult to predict. It may respond to modifications in construction, but will require determinations be made after construction of the recommended improvements. Total Ammonia NH3. unlike the other parameters considered in this report, will require modifications beyond those used in flood control. The primary issue with NH3 is reducing the concentration of Unionized Ammonia, as opposed to reducing all forms of ammonia. The relative concentrations of Unionized Ammonia (NH3) and Aqueous Ammonium (NH4) depend upon the availability of excess Hydrogen ions (H+), The measure of H+ in water is pH. Figure 6-1 shows the NH percent concentration that is NH3. Figure 6-1: Change in percent of total ammonia (NH3), as a function of pH and temperature. Pld 20 l 15 10 /'- ,/ % Q..H=7.5 ------- o , 5 1D , 15 Temperature DC 25 30 I -<>+,=6 ~~-pH~5 -p..,=7 -.- pH=7 5 --- pH=6 ~pH=8,5 As pH increases, so does the percentage of NH3 from (at 250C) around 2% at pH 7.0 to about 15% at 8.5. Increasing pH indicates loss of hydrogen from solution. The rise in pH represented in Figure 1.1.1 can be produced by addition of limestone (CaC03) to the surface water. As the 121 SFWMD & Collier County Immokalee storm Water Management Plan Ih*~ ~8::::J- ~. ~ *-1,3 LOCHNER Alternative Analysis limestone dissolves and calcium is removed, the remaining carbonate (C03) absorbs hydrogen, increasing the pH. The amount of limestone necessary to raise the pH of a lake with volume 628,320 ft3 to 8.4 is 1,581.7 Ibs. The amount of limestone necessary to maintain that pH associated with pumping groundwater is about 5.815 lbs of limestone per day or 2,653 Ibs per year. Limestone is a natural material common in Florida costing around $10.00/1,000 Ibs. 6.3 STRUCTURAL AND NON-STRUCTURAL BMPS Structural BMP's consist of dams, weirs and culverts. These modifications will result in decreases in the concentrations of TSS, and possibly E. Coli at some locations. Nonstructural BMP's consist of addition of wetlands and use of limestone in construction. The wetlands will impact the concentration of TP04. The use of limestone in construction will result in raising the pH of the surface water and decrease the concentration of Unionized Ammonia. The locations for the individual structural and non-structural BMPs of each SWMP alternative is included in this document under Appendix B 6.4 MODEL PREDICTIONS The improvements to water quality parameters for each proposed SWMP alternative is summarized in the following tables. The detailed plots are shown in Appendix C. Detailed evaluations of model results give general indications of possible water quality issues that may arise in the future. This report evaluation relies on the water quality predictions from the 5-year storm rather than longer duration storms because the greatest water quality impact would be in the early portion of the storm. In terms of regulatory standards, the model predicts that two of the four pollutants, E. Coli and TP04 will be of concern in the future. This will have to be tested to confirm model results in the field. Model results for each of the four alternatives were compared with those derived for the existing condition LOS. Appendix C contains figures showing the water quality distributions produced at each of the four sites of interest (nodes N207, N217, N333 and N557). Comparisons on each figure are made between the current LOS, existing land uses for that alternative, and future land uses for that alternative. The following tables compare the extent of differences produced by the alternatives by making comparison to the existing LOS, for both existing and future land uses. The general form of the equation used for the comparison is shown below and at the top of each table: ~ SFWMD & Collier County Immokalee Storm Water Management Plan -=G~ =tfz( Ie B-+ J?=f.40 * /3 LOCH~~ Alternative Analysis Water Quality Change = ~(Alt-LOS)LOS The water quality change is expressed as a summation performed over the entire time covered in the figure (-24 hours). 'All' is the water quality value at any time for each of the four alternatives. Calculations are performed for both existing and future land-use schemes for each alternative. 'LOS' is the water quality value calculated for the existing LOS. Table 6.4.1: Water Quality Change; L(Alt-LOS)LOS Total Suspended Solids N207 N217 N333 N557 Alt 1 Alt 2 Alt 3 Alt4 123 SFWMD & Collier County Immokalee Storm Water Management Plan ~~\c&q- ~ . L\: \ cu-{- f6~S LOCHNER Alternative Analysis Table 6.4.2: Water Quality Change; r(Alt-LOS)LOS TotalOrtho-Phos hate N207 N217 N333 N557 Alt 1 Alt2 Alt 3 Alt4 Table 6.4.3: Water Quality Change; r(Alt-LOS)LOS Total Nitrogen N207 N217 N333 N557 Alt 1 Alt2 Alt 3 Alt4 ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~~-~ IQBi- ~\ . L\ d-- ~ /35""" LOCHNER Alternative Analysis Table 6.4.4: Water Quality Change; l:(Alt-LOS)LOS E.Coli N207 N217 N333 N557 Alt 1 Alt 2 Alt 3 Alt4 Tables 6.4.5: Water Quality Change; l:(Alt-LOS)LOS Total Ammonia N207 N217 N333 N557 Alt 1 Alt 2 Alt 3 Alt4 125 SFWMD & Collier County Immokalee Storm Water Management Plan ~-\-e-M 4=={ ~ D ::f- ~,y~ a+ f3S LocHNER Alternative Analysis We can summarize the water quality changes exhibited in Appendix C based on the values calculated in Tables 6.4.1 to 6.4.5, as follows: · The larges differences for TSS occurred at N207, and did not always indicate improved water quality for the alternatives (Table 6.4.1). · For TP04, the differences were more obvious for N217, N333 and N557 than N207. Again the variations do not always indicate water quality improvements (Table 6.4.2). · For TN, the alternatives produce substantial declines in water quality values for existing land uses, but are less effective with respect to future land uses (Table 6.4.3). · E. Coli declines are most noticeable at N207, but less dramatic at the other sites (Table 6.4.4 ). · The alternatives appear to effectively reduce NH3 contamination at all the sites (Table 6.4.5). · TP04 and E. Coli were observed in the model to most consistently exceed standards. Although that conclusion will need further confirmation with field sampling, both pollutants may be effected by both structural and non-structural BMP's. · We recommend water-quality monitoring to further refine model performance and to determine directly the areas most in need of special BMP's for improvements. ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~,~[b6+- ~ .Lt~ 0-t- IS'S LO'dHNER Alternative Analysis 7.0 ANALYSIS OF SWMP ALTERNATIVES The methodology used in the development and evaluation of SWMP alternatives for the Immokalee basin is based on the modeling of impacts of the SWMP components detailed in Section 4. The XP software version of the United States Environmental Protection Agency's (USEPA) Stormwater Management Model (SWMM) RUNOFF and EXTRAN modules were used for the hydrologic and hydraulic evaluations, respectively. Water stages, concentrations of pollutants of concern, and peak discharge were evaluated for the following SFWMD design storms: 5-yr/24- hr, 10-yr/72-hr, 25-yr/72-hr and 100-yr/72-hr. The SWMP alternatives analyzed in this section are detailed below. The impact on flood protection level of service (FP-LOS) is shown in Table 7-1. Table 7 -1 Flood Protection Level of Service (FP-LOS) Table A: Maximum Stages for Existing Land Use / Percent Impervious ~\.,je" ~,.,je '). '>Ie '?> ~,.,je 0- l(\$ ((\$ l(\'1>....' l(\$ ".,....e ~....e ~....e ~....e /I/ll/I/I/l////jl/l/i%'~ I/I/l~' //fr;~ /j/t 5/d/t:/j/S/s/g/g/f g/i/5 5/} Node Description 'f 'f 'f 'f 'f 'f 'f 'f 'f 'f 'f 'f 'f 'f 'f 'f Fish Creek (N333) 25.00 26.89 27.20 27.73 24.77 26,74 26.98 27.43 24.66 26.68 26.94 27.38 24.66 26.68 26,94 27.38 Slough (N217) 2484 24.92 24,92 24,93 24.84 24.93 24.93 24.93 24.84 2493 24.93 24.93 2484 24,93 24.93 24.94 5th Street (N207) 28.26 2859 28.82 29.12 28.26 28.59 2882 29.12 28.26 28.59 2882 29,12 28.24 28.57 28.80 29.09 Madison Ave (N557) 30.30 31.05 31,06 31,09 30.30 31.05 31.06 31.09 30,30 3105 31.06 31.09 30,31 31,05 31.06 31.09 Table B: Maximum Stat es for Future Land Use / Percent Impervious ,,-Ie" \-10, '). ..,-Ie '!I '>Ie 0- (\$" (\$" (\$' (\'1>....' ~....el ~....el p..,....e( ".,....e( ~Q~~0~~~~~~~~%Q~~~~~~~~~.~Qf~~%~~%~~~.~~Q~~l~~~~~'1.~ ,..,...: ~.).;; -...: ~ A""": ..: ~,...,...: ..: ~ ~.s:: ~ Q ~ A ~ t:).&.:..\:..\: Q ~.s:: ..\: <::) tQ ~ /!J ~ ,.., ~ ~ ~ :; ~ ~ ~ Ct) ~ ~ ~ t t t t ~ ~ ~ ~ ~ ~ d d ,! ~ ~ ~ Node Description ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Fish Creek (N333) 25,95 2724 27.62 28,04 25,52 27.18 27.47 27.80 25.46 26.99 27.27 27,62 25.46 26.99 27.24 27.62 Slough (N217) 24,84 24.92 24.92 24,93 24.84 24,92 2493 24,94 24.84 24.92 24.93 24,93 24,84 24.92 24.93 24.94 5th Street (N207) 28,32 28.68 28.89 29,16 28,34 28.67 28.89 29.16 28,33 28.67 28,89 29,16 28,32 28.62 28,87 29.16 Madison Ave (N557) 30.42 31.07 31,08 31.11 30.41 31.07 31.08 31.11 30.42 31,07 31,08 31.11 30.41 31.07 31.08 31.11 ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~~b&~ ~ .<ls:- * (~~ LOCHNER Alternative Analysis 7.1 AL TERNA TIVE 1 Alternative 1 is comprised of drainage changes in 4 areas of the watershed; Downtown Immokalee, Western Lake Trafford Road, Sloughs west of Sanitation Road, and Fish Creek just north of Lake Trafford Road. In downtown Immokalee (5th Street South), Alternative 1 comprises an enhancement of the existing drainage system. Culvert upgrades dominate this alternative in the western lake Trafford Road area. In the area west of Sanitation Road, the improvements include additions of cross-drains to 3 road crossings. Finally, Alternative 1 proposes excavation to widen Fish Creek close to Trafford Road. Alternative 1 is presented in schematic form in Figure 7-1. Figure 7-1 Immokalee Improvements Alternative # 1 Slough Cross-Drain l {"~"";::j'l,;::::.J ~ditions li{.';~.":.~....':":2 .'~ ".~:;;~'~ . . ..~.~, ..' - u"......;c.' ,.".....;::::-'_ 1J' ";""" Immokalee Storm Water Master Plan Alternative #1 n ~ ~. LOCHNER .'.. ENGINEBlSMDPlNIlERS In Assocl.lon \Vfth ~n~ hs SFWMD & Collier County Immokalee storm Water Management Plan ~~:tt: ICuD+- 'tx1.Y 1.0 '4 l~~ L'O~HNER Alternative Analysis 7.2 ALTERNATIVE 2 Alternative 2 is comprised of drainage changes in 4 areas of the watershed; Downtown Immokalee, Western Lake Trafford Road, Sloughs west of Sanitation Road, and Fish Creek just north of Lake Trafford Road. In downtown Immokalee (5th Street South), Alternative 2 comprises enhancement of the existing drainage system. Culvert upgrades dominate this alternative in the western lake Trafford Road area. In the area west of Sanitation Road, the improvements include additions of cross-drains to 3 road crossings. Also in the downtown Immokalee area, Alternative 2 incorporates construction of a water quality control structure near 5th Street and Bethune Road; 48 inch stabilization pipes and exfiltration trenches; and almost doubling the length of the section widened along Fish Creek. Alternative 2 proposes excavation to widen Fish Creek close to Trafford Road. Alternative 2 is presented in schematic form in Figure 7-2. Figure 7-2 Immokalee Improvements Alternative # 2 1J' Slough Cross-Drain U ;L~'" .:::.,_,~fdilions /.-;,.,:.:,~ ..,~,........ . I;:E:~. I:::~:: \/"'::... I..;:... 1J' ....., Immokalee Storm Water Master Plan Alternative #2 ~ ~~D~~ .j ~ In Auocl.'ion wlth . . C;) l~ n!;,~~ \29 SFWMD & Collier County Immokalee Storm Water Management Plan -X--\cvV1:# l tot31 tu.Lf1- *'~S LOCl4NER Alternative Analysis 7.3 AL TERNA TIVE 3 Alternative 3 is comprised of drainage changes in 4 areas of the watershed; Downtown Immokalee, Western Lake Trafford Road, Sloughs west of Sanitation Road, and Fish Creek just north of Lake Trafford Road. In downtown Immokalee (5th Street South), Alternative 3 comprises enhancement of the existing drainage system. Culvert upgrades dominate this alternative in the western lake Trafford Road area. In the area west of Sanitation Road, the improvements include additions of cross-drains to 3 road crossings. Also in the downtown Immokalee area, Alternative 3 incorporates construction of a water quality control structure near 5th Street and Bethune Road; 48 inch stabilization pipes and exfiltration trenches; and almost doubling the length of the section widened along Fish Creek. Alternative 3 proposes excavation to widen Fish Creek close to Trafford Road. Alternative 3 incorporates additional lengthening of Fish Creek widening. Alternative 3 also includes the following improvements in the Immokalee Drive vicinity: improved drainage to Immokalee Drive; construction of a water quality control structure at the south end of Wells Street; addition of stabilization pipe and exfiltration trenches. Alternative 3 is presented in schematic form in Figure 7-3. Figure 7-3 Immokalee Improvements Alternative # 3 - 1]' Slough Cross-DraIn W" <..:.":'f=-",~ddl"ons . /.'~'.'~":~.:'>..:. '~~:~~.~~ ..;;j' '::::::: 1]' T"' ~"_ I. Immokalee Storm Water Master Plan Alternative #3 Q - c".:. ~A~!ll 130 SFWMD & Collier County Immokalee storm Water Management Plan ~-WV1A- ~ I Lo B 7_ ~ .L{C 0+ 13~ LO'CHNER Alternative Analysis 7.4 AL TERNA TIVE 4 Alternative 4 is comprised of drainage changes in 4 areas of the watershed; Downtown Immokalee, Western Lake Trafford Road, Sloughs west of Sanitation Road, and Fish Creek just north of Lake Trafford Road. In downtown Immokalee (5th Street South), Alternative 4 comprises enhancement of the existing drainage system. Culvert upgrades dominate this alternative in the western lake Trafford Road area. In the area west of Sanitation Road, the improvements include additions of cross-drains to 3 road crossings. Also in the downtown Immokalee area, Alternative 4 incorporates construction of a water quality control structure near 5th Street and Bethune Road; 48 inch stabilization pipes and exfiltration trenches; and almost doubling the length of the section widened along Fish Creek. Alternative 4 proposes excavation to widen Fish Creek close to Trafford Road. Alternative 4 incorporates additional lengthening of Fish Creek widening. Alternative 4 also includes the following improvements in the Immokalee Drive vicinity: improved drainage to Immokalee Drive; construction of a water quality control structure at the south end of Wells Street; addition of stabilization pipe and exfiltration trenches. Alternative 4 incorporates a storm and water quality control pond at Eustis and 9th street in downtown Immokalee. Alternative 4 also adds enhancement of drainage in the Madison Creek area north of Downtown Immokalee. Alternative 4 is presented in schematic form in Figure 7-4. Detailed hydrograph results showing the reduction in flood stages for the four SFWMD design storms is included in Appendix D. 131 SFWMD & Collier County Immokalee Storm Water Management Plan ~--L ~-VYl *l~67- '1'8,~g ~-1-13S lL'dcHNER Alternative Analysis Figure 7-4 Immokalee Improvements Alternative # 4 Slough Cross-Drain ,. H/~:.,,,.,;.,;:if:;;.::::..w:,::~Cjdltions . . ....~..."......'.-.'. :""-",, /,~",:;.-t '~. . , '''......_..'. "'~"f__. ..; .::"'T ,..,~- 1]' '...-..t+....' :' ",..;::- Immokalee Storm Water Master Plan Alternative #4 w ~n~ ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~~{~~1---- ~ ,~D v+ J35 LOCHNER Alternative Analysis 7.5 PROBABLE CONSTRUCTION COST This opinion of probable construction cost is an approximate estimate made without detailed engineering data and is based on the current bidding climate for similar type projects involving drainage construction. Unit price cost data was obtained from several bid tabulation forms for recent roadway drainage and canal dredging projects within southern Florida. It is expected that an estimate of this type would be accurate within +50% to -30%. Prices are intended to include all costs and expenses for taxes, labor, equipment, and contractor's overhead and profit. The opinions of cost shown and any resulting conclusions on project financial or economic feasibility or funding requirements have been prepared for guidance in project evaluation and implementation from the information available at the time the opinion was prepared. The final and actual costs will depend on actual labor and material costs, competitive market conditions, actual site conditions, final project scope, implementation schedule, and other variable factors. As a result, the final project costs will vary from the opinions of cost presented herein. Because of this, project feasibility and funding needs must be carefully reviewed prior to making specific financial decisions to help insure proper project evaluation and adequate funding. The individual physical components of each SWMP alternative are included in this document under Appendix B. These components have been used to estimate the probable constructions costs shown in Table 7-2. Table 7-2: Probable Construction Cost. ALTERNATIVE #1 Location Description Unit Quantity Price Total 1. Delaware Ave. (151 Street to 6'" Street) a, 48" RCP (Storm Sewer) LF 2,201.00 85.00 $187,085,00 b, Inlet Type 0 EA 6,00 3,000.00 $18,000.00 2. Colorado Ave. (151 Street to g'" Street) a. 48" RCPlStorm Sewer) LF 2,632.00 85,00 $223,720.00 b, Inlet Type 0 EA 7,00 3,000,00 $21,000.00 3. Boston Ave. (151 Street to White Wav) a. 48" RCP (Storm Sewer) LF 3,281,00 85,00 $278,885,00 b, Inlet Tvpe 0 EA 9.00 3,000,00 $27,000,00 4. 7'" Street (Colorado to Boston Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 603.00 80,00 $48,240,00 b. Inlet Tvoe C EA 2.00 3,000,00 $6,000,00 Pollution Retardant Baffle c. (Alum,) EA 2.00 300,00 $600.00 133 SFWMD & Collier County Immokalee storm Water Management Plan ~~~ t ~6':r f5 - 5 ( t:s-f l~$ LOCHNER Alternative Analysis Location I Description Unit I Quantity Price Total 5. 4th Street (Colorado to Boston Ave.) Exfiltration Trench (18" a. Perforated Pioe) LF 603.00 80,00 $48,240.00 b. Inlet Type C EA 3.00 3,000.00 $9,000.00 Pollution Retardant Baffle c. (Alum,) EA 3.00 300.00 $900,00 S. 9th Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a, Perforated Pipe) LF 615.00 80.00 $49,200.00 b. Inlet Tvpe C EA 2,00 3,000.00 $6,000,00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300.00 $600.00 7. ath Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615,00 80,00 $49,200.00 b. Inlet Tvpe C EA 2.00 3,000,00 $6,000.00 Pollution Retardant Baffle c. (Alum,) EA 2.00 300.00 $600.00 a. 7'" Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80.00 $49,200,00 b. Inlet Tvpe C EA 2,00 3,000,00 $6,000,00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300,00 $600,00 9. Sin Court (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80.00 $49,200,00 b. Inlet Type C EA 2.00 3,000,00 $6,000,00 Pollution Retardant Baffle c. (Alum.) EA 2.00 300.00 $600.00 10. 4tn Street (Delaware to Colorado Ave.) Exfi Itration Trench (18" a. Perforated Pipe) LF 615.00 80.00 $49,200,00 b. Inlet Type C EA 2,00 3,000.00 $6,000,00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300,00 $600,00 11. 3ra Street (Delaware to Colorado Ave} Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80.00 $49,200,00 b. Inlet Tyee C EA 2.00 3,000,00 $6,000.00 Pollution Retardant Baffle c. (Alum.) EA 2.00 300.00 $600.00 12. 2na Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80.00 $49,200,00 ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~~Vl ~ I b6+ ~. .~d- 0'+ 13~ L6cHNER Alternative Analysis Location Description Unit Quantitv Price Total b. Inlet Type C EA 2,00 3,000,00 $6,000.00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300,00 $600,00 13. 5U1 Street (South of Maple Drive) Furnish and install 21'x10, Water Quality Control Structure #1 EA 1,00 12,000.00 $12,000,00 14. Lake Trafford Culvert Upgrades 15" CMP (Storm Sewer) Tippins Terrace (Mitered End) LF 60.00 35.00 $2,100,00 15" CMP (Storm Sewer) No Name Road "An (Mitered End) LF 60.00 35,00 $2,100.00 15" CMP (Storm Sewer) Trafford Farm Road (Mitered End) LF 60,00 35,00 $2,100.00 Taylor Terrace (S) 15" CMP (Storm Sewer) (Mitered End) LF 60,00 35.00 $2,100.00 15" CMP (Storm Sewer) Hall Road (Mitered End) LF 60,00 35,00 $2,100,00 15" CMP (Storm Sewer) Christian Terrace (Mitered End) LF 60.00 35.00 $2,100.00 15" CMP (Storm Sewer) Miraham Terrace (Mitered End) LF 55,00 35,00 $1,925.00 Raulerson Road (S) 15" CMP (Storm Sewer) (Mitered End) LF 55,00 35.00 $1,925.00 15" CMP (Storm Sewer) Little Leaque Road (Mitered End) LF 90,00 35.00 $3,150,00 15. Slough Cross Drain Additions Sanitation Road Crossinq 48" CMP (2 @ 50' Each) LF 100,00 85,00 $8,500,00 Road Crossing West of 60" CMP (2 @ 50' Each) Sanitation Road LF 100,00 125,00 $12,500.00 2na Road Crossing West of Sanitation Road 72" CMP LF 50,00 200,00 $10,000,00 16. Fish Creek Conveyance Capacity Improvements a, Canal Excavation CY 1,678.00 20,00 $33,560,00 Sub Total 1 : $1,355,430.00 GENERAL 1 Mobilization (7%) LS 1,00 94,880.10 $94,880,10 2 Maintenance of traffic (5%) LS 1.00 67,771,50 $67,771,50 3 Surveying LS 1.00 10,000.00 $10,000,00 Additional 10% Contingency $135,543,00 Sub Total 2: $308,194.60 Grand Total: $1,663,624.60 hs SFWMD & Collier County Immokalee storm Water Management Plan --::c-terV)1t ( 1.0 t;+ m'~~ v+l3~ LOCHNER Alternative Analysis ALTERNATIVE #2 Location Description Unit Quantity Price Total 1. Delaware Ave. (1s1 Street to 51n Street) a. 48" RCP (Storm Sewer) LF 2,201.00 I 85.00 $187,085.00 b. Inlet Type D I EA 6.00 3,000.00 $18,000,00 2. Colorado Ave. (1 ~I Street to gin Street) a. 48" RCP (Storm Sewer) I LF 2,632.00 85.00 $223,720.00 b. Inlet Type D EA 7.00 3,000.00 I $21,000.00 3. Boston Ave. (1s1 Street to White Wav} a. 48" RCP (Storm Sewer) LF I 3,281,00 I 85,00 $278,885.00 b. Inlet Type D EA 9.00 3,000,00 $27,000,00 4. 71n Street (Colorado to Boston Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 603.00 80,00 $48,240.00 b. Inlet Type C EA 2,00 3,000,00 $6,000.00 Pollution Retardant Baffle c, (Alum.) EA 2.00 300.00 $600.00 5. 4tn Street (Colorado to Boston Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 603,00 80,00 $48,240.00 b, Inlet Type C EA 3.00 3,000.00 $9,000.00 Pollution Retardant Baffle c. (Alum.) EA 3.00 300.00 $900.00 5. gtn Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80,00 $49,200,00 b. Inlet Type C EA 2.00 3,000.00 $6,000.00 Pollution Retardant Baffle c, (Alum,) EA 2,00 300,00 $600.00 7. aIn Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80,00 $49,200.00 b. Inlet Type C EA 2,00 3,000.00 $6,000,00 Pollution Retardant Baffle c. (Alum,) EA 2,00 300.00 $600.00 a. 7In Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615,00 80,00 $49,200,00 b. Inlet Type C EA 2.00 3,000,00 $6,000.00 Pollution Retardant Baffle c. (Alum.) EA 2.00 300.00 $600.00 g. 5tn Court (Delaware to Colorado Ave.) a. Exfiltration Trench (18" LF 615,00 80.00 $49,200.00 ~ SFWMD & Collier County Immokalee Storm Water Management Plan 'r~::U:- IbB7 M .s.Li u{. 1:S7 LOCHNER Alternative Analysis Location Description Unit Quantity Price Total Perforated Pipe) b. Inlet Type C EA 2,00 3,000,00 $6,000,00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300,00 $600,00 10. 4tn Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615,00 80.00 $49,200,00 b, Inlet Type C EA 2,00 3,000,00 $6,000,00 Pollution Retardant Baffle c, (Alum,) EA 2,00 300.00 $600,00 11. 3m Street (Delaware to Colorado Ave.) Exfi Itration Trench (18" a. Perforated Pipe) LF 615,00 80,00 $49,200,00 b. Inlet Type C EA 2,00 3,000,00 $6,000,00 Pollution Retardant Baffle c. (Alum,) EA 2,00 300,00 $600,00 12. 2na Street (Delaware to Colorado Ave.) I Exfiltration Trench (18" a. I Perforated Pipe) LF 615,00 80,00 $49,200,00 b. I Inlet Type C EA 2.00 3,000.00 $6,000,00 Pollution Retardant Baffle c, (Alum,) EA 2,00 300.00 $600.00 13. Immokalee Drive (SR 29 to Wells St.) a, 48" RCP (Storm Sewer) LF 2,435.00 85.00 $206,975,00 b, Inlet Type D EA 8,00 3,000.00 $24,000,00 14. Wells Street (Immokalee Dr. to end) a. 48" RCP (Storm Sewer) LF 1,350.00 85,00 $114,750,00 b, Inlet Type D EA 4,00 3,000,00 $12,000,00 15. Immokalee Dr. (Wells St to Gettys Dr.) Exfiltration Trench (18" a, Perforated Pipe) LF 1,430,00 80,00 $114,400,00 b, 18" Solid Pipe LF 60.00 40.00 $2,400,00 c. Inlet Type C EA 6.00 3,000,00 $18,000,00 Pollution Retardant Baffle d. (Alum,) EA 6.00 300.00 $1,800,00 16. 191n St (Immokalee Dr. to North) Exfiltration Trench (18" a. Perforated Pipe) LF 900,00 80,00 $72,000,00 b. Inlet Type C EA 3.00 3,000,00 $9,000.00 Pollution Retardant Baffle c, (Alum,) EA 3.00 300.00 $900,00 17. Sin Street (South of Maple Drive) ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~T --\-e v\A ''11 110 8 ~+-- t:s .~s- v-f (~5 LOCHNER Alternative Analysis Location Description Unit Quantitv Price Total Furnish and install 21'x10. Water Qualitv Control Structure #1 EA 1.00 12,000.00 $12,000.00 18. Wells Street (South Dead End) Furnish and install 21'x1 0, Water Qualitv Control Structure #2 EA 1,00 12,000,00 $12,000.00 19. Lake Trafford Culvert Uparades 18" CMP (Elliptical) (Mitered Tippins Terrace End) LF 60.00 40.00 $2,400.00 18" CMP (Elliptical) (Mitered No Name Road "A" End) LF 60.00 40.00 $2,400,00 18" CMP (Elliptical) (Mitered Trafford Farm Road End) LF 60.00 40.00 $2,400.00 Tavlor Terrace (S) 18" CMP (Elliptical) (Mitered End) LF 60.00 40.00 $2,400,00 18" CMP (Elliptical) (Mitered Hall Road End) LF 60,00 40.00 $2,400,00 18" CMP (Elliptical) (Mitered Christian Terrace End) LF 60,00 40.00 $2,400,00 18" CMP (Elliptical) (Mitered Miraham Terrace End) LF 55,00 40.00 $2,200.00 18" CMP (Elliptical) (Mitered Raulerson Road (8) End) LF 55.00 40.00 $2,200,00 18" CMP (Elliptical) (Mitered Little Leaque Road End) LF 90,00 40.00 $3,600,00 20. Slouah Cross Drain Additions Sanitation Road Crossina 48" CMP (2 @ 50' Each) LF 100,00 85,00 $8,500.00 Road Crossing West of 60" CMP (2 @ 50' Each) Sanitation Road LF 100.00 125,00 $12,500.00 2na Road Crossing West of Sanitation Road 72" CMP LF 50.00 200.00 $10,000,00 21. Fish Creek Conveyance Capacity Improvements a. Canal Excavation CY 3,871,00 I 20.00 $77,420,00 Sub Total 1: $1,990,315.00 GENERAL 1 Mobilization (7%) LS 1.00 139,322,05 $139,322.05 2 Maintenance of traffic (5%) LS 1,00 99,515.75 $99,515.75 3 Survevina LS 1.00 12,000,00 $12,000,00 Additional 1 0% Contingency $199,031.50 Sub Total 2: $449,869.30 Grand Total: $2,440,184.30 hs SFWMD & Collier County Immokalee storm Water Management Plan '-:L*W1::+t-{ b6+ ~.~ c+ \3S- LOCHNER Alternative Analysis ALTERNATIVE #3 Location Description Unit Quantitv Price Total 1. Delaware Ave. (151 Street to 61n Street) a. 48" RCP (Storm Sewer) LF 2,201.00 85.00 $187,085.00 b, Inlet Type D EA 6.00 3,000.00 $18,000,00 2. Colorado Ave. (151 Street to gtn Street) a, 48" RCP (Storm Sewer) LF 2,632.00 85,00 $223,720,00 b, Inlet Type D EA 7,00 3,000,00 $21.000,00 3. Boston Ave. (151 Street to White Way) a. 48" RCP (Storm Sewer) LF 3,281,00 85,00 $278,885,00 b. Inlet Type D I EA 9.00 3,000.00 $27,000,00 4. 71n Street (Colorado to Boston Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 603,00 80.00 $48,240,00 b. Inlet Type C EA 2,00 3,000,00 $6,000,00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300.00 $600.00 5. 41n Street (Colorado to Boston Ave.) Exfiltration Trench (18" a, Perforated Pipe) LF 603,00 80,00 $48,240,00 b. Inlet Type C EA 3,00 3,000.00 $9,000,00 Pollution Retardant Baffle c. (Alum,) EA 3,00 300.00 $900.00 6. gin Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a, Perforated Pipe) LF 615,00 80,00 $49,200.00 b. Inlet Type C EA 2,00 3,000.00 $6,000,00 Pollution Retardant Baffle c, (Alum,) EA 2,00 300.00 $600.00 7. 81n Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80,00 $49,200,00 b. Inlet Type C EA 2,00 3,000.00 $6,000.00 Pollution Retardant Baffle c. (Alum. ) EA 2,00 300.00 $600,00 8. 71n Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80.00 $49,200,00 b. Inlet Tvpe C EA 2,00 3,000,00 $6,000.00 Pollution Retardant Baffle c. (Alum,) EA 2.00 300.00 $600.00 g. 61n Court (Delaware to Colorado Ave.) a. Exfiltration Trench (18" LF 615.00 80,00 $49,200,00 SFWMD & Collier County Immokalee Storm Water Management Plan <-I+t~ '4 l ~ 67 ""PC\ ~1- o;t 13S LO'CHNER Alternative Analysis Location DescriDtion Unit Quantity Price Total Perforated Pipe) b. Inlet Tvoe C EA 2.00 3,000,00 $6,000.00 Pollution Retardant Baffle c. (Alum.) EA 2.00 300,00 $600,00 10. 4tn Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pioe) LF 615,00 80.00 $49,200.00 b. Inlet Tvoe C EA 2,00 3,000,00 $6,000.00 Pollution Retardant Baffle c. (Alum.) EA 2.00 300.00 $600,00 11. 3ra Street (Delaware to Colorado AveJ Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80.00 $49,200,00 b. Inlet Tvoe C EA 2.00 3,000,00 $6,000.00 Pollution Retardant Baffle c. (Alum.) EA 2.00 300.00 $600,00 12. 2na Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80.00 $49,200.00 b. Inlet Type C EA 2.00 3,000,00 $6,000.00 Pollution Retardant Baffle c. (Alum.) EA 2.00 300.00 $600,00 13. Immokalee Drive (SR 29 to Wells St.) a. 48" RCP (Storm Sewer) LF I 2,435.00 85.00 $206,975.00 b. Inlet Tvpe D EA 8,00 3,000,00 $24,000,00 14. Wells Street (Immokalee Dr. to end) a. 48" RCP (Storm Sewer) LF 1,350,00 85.00 $114,750.00 b. Inlet Type D EA 4.00 3,000,00 $12,000.00 15. Immokalee Dr. (Wells St to Gettys Dr.) Exfiltration Trench (18" a. Perforated Pipe) LF 1,430.00 80.00 $114,400.00 b, 18" Solid Pipe LF 60.00 40.00 $2,400.00 c. Inlet Tyoe C EA 6,00 3,000.00 $18,000.00 Pollution Retardant Baffle d. (Alum.) EA 6,00 300,00 $1,800.00 16. 19tn St (Immokalee Dr. to North) Exfiltration Trench (18" a. Perforated Pipe) LF 900.00 80.00 $72,000.00 b. Inlet Tvoe C EA 3.00 3,000,00 $9,000,00 Pollution Retardant Baffle c. (Alum.) EA 3.00 300.00 $900.00 17. 5tn Street (South of Maple Drive) Furnish and install 21'x10. Water Quality ~ SFWMD & Collier County Immokalee Storm Water Management Plan '~~w~'#: J bb'1- ~ ,S~ o{- (~,S- LOCHNER Alternative Analysis Location DescriDtion Unit Quantity Price Total Control Structure #1 EA 1,00 12,000,00 $12,000,00 18. Wells Street (South Dead End) Furnish and install 21'x10, Water Qualitv Control Structure #2 EA 1.00 12,000.00 $12,000.00 19. Lake Trafford Culvert Upgrades 18" CMP (Elliptical) (Mitered Tippins Terrace End) LF 60,00 40,00 $2,400.00 18" CMP (Elliptical) (Mitered No Name Road "A" End) LF 60,00 40.00 $2,400,00 18" CMP (Elliptical) (Mitered Trafford Farm Road End) LF 60,00 40,00 $2,400.00 18" CMP (Elliptical) (Mitered Taylor Terrace (S) End) LF 60,00 40,00 $2,400.00 18" CMP (Elliptical) (Mitered Hall Road End) LF 60,00 40.00 $2,400.00 18" CMP (Elliptical) (Mitered Christian Terrace End) LF 60,00 40,00 $2,400.00 18" CMP (Elliptical) (Mitered Miraham Terrace End) LF 55.00 40,00 $2,200.00 18" CMP (Elliptical) (Mitered Raulerson Road (S) End) LF 55,00 40,00 $2,200.00 18" CMP (Elliptical) (Mitered Little Leaaue Road End) LF 90,00 40,00 $3,600,00 20. Slough Cross Drain Additions Sanitation Road Crossinq 48" CMP (2 (a) 50' Each) LF 100,00 85.00 $8,500,00 Road Crossing West of Sanitation Road 60" CMP (2 (a) 50' Each) LF 1 00,00 125.00 $12,500.00 2na Road Crossing West of Sanitation Road 72" CMP LF 50,00 200.00 $10,000.00 21. Fish Creek Conveyance Capacity Improvements a, Canal Excavation CY 3,871,00 20,00 $77,420,00 Non-vegetated Portion of Lake b, (4 AC) CY 45,173,00 8,00 $361,384,00 Vegetated Portion of Lake (1 c. AC) LS 1,00 45,000,00 $45,000.00 Sub Total 1 : $2,396,699.00 GENERAL 1 Mobilization (7%) LS 1,00 167,768.93 $167,768,93 2 Maintenance of traffic (5%) LS 1,00 117,584,95 $117,584,95 3 Survevina LS 1,00 15,000,00 $15,000.00 Additional 10% Contingency I $239,669,90 Sub Total 2: $540,023.78 Grand Total: $2,936,722.78 141 SFWMD & Collier County Immokalee storm Water Management Plan ~~*llQ84 ~ .S9' o-f (3~ LOCHNER Alternative Analysis ALTERNATIVE #4 Location DescriDtion Unit Quantity Price Total 1. Delaware Ave. (1s1Street to 6In Street) a. 48" RCP (Storm Sewer) LF 2,201.00 85,00 $187,085.00 b. Inlet Type D EA 6.00 I 3,000.00 $18,000,00 2. Colorado Ave. (1 St Street to gin Street) a. 48" RCP (Storm Sewer) I LF 2,632.00 I 85,00 $223,720.00 b. Inlet Type D EA 7,00 3,000.00 $21,000.00 3. Boston Ave. (1 St Street to White Way) a. 48" RCP (Storm Sewer) LF 3,281.00 85.00 $278,885.00 b. Inlet Type 0 EA 9,00 3,000,00 $27,000,00 4. 7th Street (Colorado to Boston Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 603.00 80.00 $48,240.00 b. Inlet Type C EA 2.00 3,000,00 $6,000,00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300,00 $600.00 5. 4tn Street (Colorado to Boston Avej Exfiltration Trench (18" a. Perforated Pipe) LF 603.00 80.00 $48,240.00 b. Inlet Type C EA 3.00 3,000.00 $9,000.00 Pollution Retardant Baffle c. (Alum,) EA 3,00 300.00 $900,00 6. g'" Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80,00 $49,200,00 b. Inlet Type C EA 2,00 3,000.00 $6,000.00 Pollution Retardant Baffle c. (Alum.) EA 2.00 300,00 $600.00 7. 8tn Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615,00 80,00 $49,200,00 b. Inlet Type C EA 2.00 3,000,00 $6,000,00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300,00 $600,00 8. 7th Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80,00 $49,200,00 b, Inlet Type C EA 2,00 3,000,00 $6,000.00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300.00 $600.00 142 SFWMD & Collier County Immokalee storm Water Management Plan '~y\ */lcB'q pO .~() ~ \3S- LOC~NER Alternative Analysis Location Description Unit Quantity Price Total 9. 6uI Court (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80,00 $49,200,00 b, Inlet Type C EA 2.00 3,000,00 $6,000,00 Pollution Retardant Baffle c. (Alum,) EA 2,00 300,00 $600.00 10. 4111 Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615.00 80.00 $49,200,00 b. Inlet Type C EA 2,00 3,000,00 $6,000,00 Pollution Retardant Baffle c, (Alum.) EA 2,00 300,00 $600.00 11. 3ru Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615,00 80.00 $49,200.00 b. Inlet Type C EA 2,00 3,000.00 $6,000,00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300.00 $600.00 12. 2na Street (Delaware to Colorado Ave.) Exfiltration Trench (18" a. Perforated Pipe) LF 615,00 80,00 $49,200,00 b. Inlet Type C EA 2,00 3,000,00 $6,000,00 Pollution Retardant Baffle c. (Alum.) EA 2,00 300,00 $600,00 13. Immokalee Drive (SR 29 to Wells St.) a. 48" RCP (Storm Sewer) LF 2,435,00 85,00 I $206,975,00 b, Inlet Type D EA 8,00 3,000,00 $24,000.00 14. Wells Street (Immokalee Dr. to end) a, 48" RCP (Storm Sewer) LF 1,350.00 85,00 $114,750.00 b, Inlet Type 0 I EA 4,00 3,000,00 $12,000,00 15. Immokalee Dr. (Wells St to Gettys Dr.) Exfiltration Trench (18" a. Perforated Pipe) LF 1,430,00 80.00 $114,400,00 b. 18" Solid Pipe LF 60,00 40,00 $2,400.00 c. Inlet Type C EA 6,00 3,000,00 $18,000,00 Pollution Retardant Baffle d, (Alum,) EA 6,00 300,00 $1,800,00 16. 19u, St (Immokalee Dr. to North) Exfiltration Trench (18" a. Perforated Pipe) LF 900.00 80,00 $72,000,00 b. Inlet Type C EA 3.00 3,000,00 $9,000,00 Pollution Retardant Baffle c, (Alum.) EA 3.00 300.00 $900.00 \43 SFWMD & Collier County Immoka/ee Storm Water Management Plan ~ --LlQM~tL {lo B ~I- -fXj . {P I -n-f 135 LOCHNER Alternative Analysis Location Description Unit Quantity Price Total 17.5'" Street (South of Maple Drive) Furnish and install 21'x1 O. a. Water Quality Control EA 1,00 12,000,00 $12,000.00 Structure #1 18. Wells Street (South Dead End) Furnish and install 21'x1 O. Water Quality Control Structure #2 EA 1,00 12,000,00 $12,000.00 19. Lake Trafford Culvert Upgrades 18" CMP (Elliptical) (Mitered Tippins Terrace End) LF 60.00 40.00 $2,400.00 18" CMP (Elliptical) (Mitered No Name Road "A" End) LF 60,00 40.00 $2,400,00 18" CMP (Elliptical) (Mitered Trafford Farm Road End) LF 60.00 40.00 $2,400.00 18" CMP (Elliptical) (Mitered Taylor Terrace (S) End) LF 60.00 40.00 $2,400,00 18" CMP (Elliptical) (Mitered Hall Road End) LF 60.00 40.00 $2,400.00 18" CM P (Elliptical) (M itered Christian Terrace End) LF 60.00 40.00 $2,400.00 18" CMP (Elliptical) (Mitered Miraham Terrace End) LF 55.00 40,00 $2,200.00 Raulerson Road (S) 18" CMP (Elliptical) (Mitered End) LF 55,00 40.00 $2,200.00 18" CMP (Elliptical) (Mitered Little Leaaue Road End) LF 90.00 40.00 $3,600.00 20. Slouah Cross Drain Additions Sanitation Road Crossina 48" CMP (2 @ 50' Each) LF 100,00 85.00 $8,500.00 Road Crossing West of 60" CMP (2 @ 50' Each) Sanitation Road LF 100.00 125.00 $12,500.00 2na Road Crossing West of Sanitation Road 72" CMP LF 50.00 200.00 $10,000.00 21. Fish Creek Conveyance Capacity Improvements a. Canal Excavation CY 3,871.00 20.00 $77,420,00 Non-vegetated Portion of b. Lake (4 AC) CY 45,173,00 8.00 $361,384.00 Vegetated Portion of Lake (1 c. AC) LS 1,00 45,000,00 $45,000,00 22. 9th Street and Eustis Avenue Improvements Non-vegetated Portion of a. Lake (4 AC) CY 45,173.00 8,00 $361,384.00 Vegetated Portion of Lake (1 b. AC) LS 1.00 45,000.00 $45,000.00 23. Madison Ave Ditch (Manatee to Charlotte Street) /44 SFWMD & Collier County Immokalee storm Water Management Plan -~~ ~ llo(j-~l-- ~ '~J.- o-~ 13S- LOCHNER Alternative Analysis Location Description Unit Quantitv Price Total a. Ditch Excavation CY 17,100,00 5.00 $85,500.00 Sub Total 1 : $2,888,583.00 GENERAL 1 Mobilization (7%) LS 1,00 202,200,81 $202,200.81 2 Maintenance of traffic (5%) LS 1,00 142,179,15 $142,179,15 3 Surveyinq LS 1,00 17,000.00 $17,000.00 Additional 10% Contingency $288,858.30 Sub Total 2: $650,238.26 Grand Total: $3,538,821.26 7.6 RECOMMENDA TION In consultation with the SFWMD and the County Board during the community briefing that took place on March 2, 2005, we recommend Alternative 4, grand total cost $3,659,403.10, for the conceptual design stage of this project. This recommendation is based primarily on the fact that this proposed SWMP alternative provides the best mitigation to flood protection and water quality levels of service, as documented in this report and specifically shown in Section 7.0, Table 7-1, Flood Protection Level of Service (FP-LOS). \45 SFWMD & Collier County Immokalee storm Water Management Plan ~~ I~&?- '.~ . ~'~ *-/ J35 LO"CHNER AlternatIve Analysis 8.0 FUNDING ANALYSIS 8.1 INTRODUCTION A fundamental portion of this Stormwater Master Plan (SWMP) Study is the cost and funding necessary to implement the recommendations in a timely manner. H.W. Lochner, Inc. (LOCHNER) studied several funding sources that Collier County provided, which include: · Special County Revenue Fund for Water Management. . Stormwater utility service charge. . Revenue bonding. · General obligation bond for capital improvements . Pay-as-you-go funding · Municipal service taxing units (MSTU) · Municipal service benefit units (MSBU) · Special assessments · State grants . Federal grants. Collier County's Board of Commissioners authorized a concurrent stormwater utility rate study report to cover SWMP recommendations from different studies at a County wide level. The study was completed by PBS&J in January of 2005, and it presents a funding path for the Immokalee SWMP. 8.2 ECONOMIC CONDITIONS Background Collier County has made impressive economic strides since the completion of the Tamiami Trail in 1928. The State of Florida certified Collier County as a 'Blue Chip Community' in 1985. This means that the County met state requirements in important areas of economic development including the creation of plans for growth management and comprehensive land use. In December 1996, the communities of Immokalee and Everglades City were designated as Enterprise Zones. The Enterprise Zone Program offers tax incentives to businesses located within the zones to encourage private investment as well as increase employment opportunities for the area's residents. Additionally, the industrial park at the Immokalee Regional Airport was designated as a Foreign Trade Zone, which allows companies to import raw materials, manufacture their products and export them duty free. In September 1997, the Immokalee community was designated as a Foreign Investment Zone, which reduces the minimum amount of investment and number of employees in order for owners of foreign companies to apply for permanent United States residency. ~ SFWMD & Collier County Immokalee Storm Water Management Plan < _-L - \tlM- -'# ( (0 b 1- Y-F~j - la l{ l)( /3 'S' LOCHNER Alternative Analysis Diversification of the local economy is an important step toward protecting and ensuring the economic viability of this community. A manufacturing incubator facility, located at the Immokalee Regional Airport Industrial Park, opened in August of 1999 and Phase II was completed in fiscal year 2002. The goal of the facility is to provide low cost manufacturing facilities, infrastructure and services so that new and emerging businesses can have a higher success rate at launching new products and ideas. The major industries within Collier County are services, wholesale trade, retail, agriculture, construction, manufacturing, financial activities and real estate. Collier County is one of the highest producing agricultural counties in the United States. Farming activities are located 40 miles inland and surround the community of Immokalee. Major crops include tomatoes, peppers, cucumbers and melons as well as the recently developed citrus business. Beef cattle are also a significant farming commodity. Included in the agricultural sector are landscaping services, forestry, farm services and commercial fishing. Since the beginning of the Immokalee area, flooding during storm conditions have been a local nuisance. The existing storm water system was not intended to handle the large amounts of present runoff. In addition, a Master Plan was needed to connect all the new developments into one network that can provide the necessary level of service and offer a future growth plan. In 1991, the Board of County Commissioners approved Ordinance 91-27, which established a Stormwater Utility. In 1992, Collier County selected David M. Griffith & Associates Ltd. (DMG) to assist in the implementation of the County's Stormwater Management Program. The primary objective of the stormwater management project was to develop a series of stormwater charges that properly reflected the costs associated with the administration, operations and maintenance, and Capital Improvement Program of the Collier County Stormwater Management Department. [PBS&J Jan-2005 Stormwater Utility Rate Study] In 2004, the Big Cypress Basin (BCB) Office, in conjunction with Collier County's Stormwater Management Department and the Florida Department of Environmental Protection (FDEP), contracted LOCHNER to prepare a comprehensive Stormwater Management Plan for the Immokalee area. As part of this study, a funding analysis evaluation was incorporated into the plan in order to assess the total cost of the SWMP and funding sources to implement the recommendations. 8.3 FUNDING PARAMETERS To develop the actual funding needs for the SWMP a three-stepped process was utilized. The first step determines the funding goal (cost) for the SWMP in the program year. The second step determines the proposed funding sources. The third step is the conclusion on funding resources for this SWMP. The following definitions apply to the parameters in this study: ~ -r-\-Q_xvt ~ (~.g ~ ~ 1.0~ * 1~5 LOCHNER Alternative Analysis SFWMD & Collier County Immokalee Storm Water Management Plan Funding goal: Program year: Inflation rates: economy. Total amount of cost to implement the SWMP, includes construction, design, CEI, survey, permitting and incidentals. The Immokalee intend year(s) for implementing the improvement plan. Rates defining the general increase in the level of prices throughout an 8.3.1 STEP ONE: FUNDING GOAL Inflation Rates: Program Year: General Inflation Construction Inflation ROW Inflation 4% 7% 33% Design Permitting Construction CEI Survey ROW 2008 2009 2009 2009 2008 2007 PHASE Current (2005) Program Year Right of Way (ROW) {15-Acres} $1,500,000.00 $2,665,333.50 Desian and Community Awareness Plan $517,788.49 $582,441.64 Construction $3,521,821.26 $4,616,389.26 Survey $17,000.00 $19,887,60 Permittina $98,652.72 $115,409.73 Construction Enaineerina Inspection (CEI) $453,802,52 $530,884.76 FUNDING GOAL (TOTAL): $6,109,065.00 $8,530,346.48 Funding Goal Accuracy is in the range of 10% above or below estimate and sensitive to inflation rates. ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~~~{~~ t:r\ ,~ ct- l3S/ LOC~NER Alternative Analysis FUNDING GOALS . Design 8% o Construction 61% i I I I I I L . CEI 0 Survey 7% 0% 10 ROW. Design 0 Con~truction 0 Survey. CEil 8.3.2 STEP TWO: FUNDING SOURCES Although there is a relatively low ad valorem tax base in the Immokalee area in comparison to coastal Collier County, property taxes collected on a County-wide or District-wide basis could be considered. In other words, the question may not necessarily exclude all property owners. Although local Special Assessments or municipal services taxing units may not be practical in the Immokalee area, area wide taxes could be used. For example, special County Revenue Funds for Water Management, such as a Stormwater Utility Fee levied on a County-wide basis could be considered as a funding source. County Revenue Bonding (supported by sales taxes) for Capital Improvements could be considered; e.g. Penny for Collier. Our findings for the various fund sources are summarized as follows: . Special County Revenue Fund for Water Management: Collier County's Board of County Commissioners approved a recommendation to establish a Stormwater Management Fund Policy on June 22, 2004. The Fund with 0.15 mils ad valorem tax is dedicated solely for the Stormwater Management Capital Improvement Program at a county-wide level. It is estimated that this fund will generate $7 million per year for the next 20 years. Their estimated contribution to the total Stormwater Utility Funding Plan is $140 million over the next 20-years, of which $67 million will go towards Water Management CIP. . Stormwater utility service charge: Collier County is presently developing a Stormwater Management Plan at a county wide level. Upon completion, a stormwater rate study will ~ SFWMD & Collier County Immokalee storm Water Management Plan ~~y\ :#:{lo~~=i-- ~. ~(+ a.+- Ij!) LOCHNER Alternative Analysis be conducted to develop user rates for the unincorporated areas of the County to fund operations and maintenance. · Revenue bonding: No plans are in place for either Collier or SFWMD to prepare a revenue bond for this area. · General obligation bond for capital improvements: No plans are in place for either Collier or SFWMD to prepare a general obligation bond for this area. · Pay-as-you-go funding: This fund source will be considered under the stormwater rate study that will be conducted to develop user rates for the unincorporated areas of the County to fund operations and maintenance. · Municipal service taxing units (MSTU): According to the Storm Water Utility Rate Study report, prepared by PBS&J in January of 2005, Collier County will generate $67 million towards SWMP Capital Improvement Projects during the next 20 years. · Municipal service benefit units (MSBU): No plan is in place for the MSBU to be applied towards SWMP Capital Improvement Projects. Florida Statute Section 212.055 (2) Paragraph (a) 1., "LOCAL GOVERNMENT INFRASTRUCTURE SURTAX", gives the county, by majority vote of county governing board and electors, the authority to levy a sales surtax in the amount of 0.5 percent or 1.0 percent specifically to fund infrastructure, which is defined as "any fixed capital expenditure for fixed capital outlay associated with the construction, reconstruction, or improvements of public facilities which has a life expectancy of 5 or more years and any land acquisition, land improvement, design, and engineering costs related thereto". This funding source could be considered in future by the county on all CIP projects and would benefit Stormwater plans. · Special assessments: Tax rates for the Big Cypress Basin (Collier County and mainland Monroe County) remain at .5265 mills. Big Cypress Basin homeowners will pay $52.65 on a house with a taxable value of $100,000 in fiscal year 2005. Big Cypress Basin does participle on Collier's CIP projects. The County gas estimated that BCB would contribute $67 million during the next 20 years towards CIP. · State and Federal grants: ad valorem taxes, State, and Federal Grants fund SFWMD. SWMP for counties in past have received revenues from SFWMD that were allocated through State and Federal Grants. This can also be a funding source to Collier County through Big Cypress Basin funds. 8.3.3 STEP THREE: CONCLUSION According with the Storm Water Utility Rates Study Report presented by PBS&J on January of 2005, Collier County intends to assign in fiscal years 2009 and 2010, approximately $7 million per year towards the Immokalee Stormwater Management Improvement Plan. The source of ho SFWMD & Collier County Immokalee Storm Water Management Plan ~*((o61 p~ .~~ 0+ l3S' LOC14NER Alternative Analysis the funds for this allocation is designated to be one-third from the ad valorem tax imposed by the county in 2004, one-third from Big Cypress Basin as contribution and one-third from Municipal service taxing units (MSTU). The exact breakdown as to intent for these funds to be allocated has not been determined. However, a plausible plan would consider obtaining ROW in 2007, Design and survey in 2008 and Permitting, CEI and Construction in 2009. 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OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/l) (mg/l) (mg/l) (MPN/100ml) (mg/l) N135 0.24 2,21 31,34 7660,17 0.08 N136 0.23 2,16 35,30 8626,69 0.09 N143 0.23 2.14 36.01 8800,86 0,09 N146 0,22 2,01 38,06 9301.80 0,10 N147 0.12 1,61 39,52 9658,39 0,10 N148 0,12 1,61 39,33 9612,82 0,10 N149 0,12 1,60 39.20 9581,33 0,10 N151 0,12 1,60 39,00 9530.48 0.10 N152 0,25 2,28 21,26 5196,87 0.05 N153 0,25 2,35 16,69 2521,57 0,04 N155 0,26 2.40 17,02 873,21 0,04 N158 0,25 2,34 16,60 851 ,72 0,04 N159 0,26 2.42 17,19 881.29 0.04 N160 0,27 2,54 18,02 923,26 0,05 N161 0.28 2,60 18,47 946.23 0,05 N290 0,33 3,17 22,44 1205,67 0,06 N323 0.12 1,61 39,51 9655,74 0,10 N325 0.29 2,66 18,88 966,58 0.05 N326 0,33 3.09 21,87 1171,15 0.06 N333 0,13 1,74 43,02 11833,77 0,09 N333a 0,13 1.74 43,12 12193,49 0,09 N334 0,11 1,58 38,97 9524,89 0,10 N335 0,13 1,73 43,10 12068,03 0,09 N337 0,08 1.09 13.33 2286,99 0,06 N340 0,12 1.59 38.99 9529.41 0,10 N474 0,13 1,74 43.12 12094,99 0,09 N503 0,29 2,70 19,13 979,03 0,05 N507 0,29 2,72 19,31 988,21 0,05 N668 0.12 1,61 39,39 9627.41 0,10 N669 0,24 2,24 26.43 6459,35 0,07 N670 0,24 2,25 24.34 5949.22 0,06 N671 0,28 2.54 18.04 925.34 0.05 N672 0,28 2,60 18.43 944.29 0.05 N673 0,28 2,63 18.65 955.30 0.05 N674 0,29 2,66 18,84 964.84 0.05 N675 0,27 2,51 17.79 912.93 0,05 SFWMD & Collier County Immokalee Storm Water Management Plan -ri-ey\- ~lla8; ?8 .7-7 0--/ 13>~ LOCHNER Alternative Analysis Fish Creek - Existing Conditions L.O.S 5-yr 24-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mglJ) (mg/I) (mgll) (MPN/100ml) (mg/I) N676 0.27 2,53 17.95 920.89 0.05 Fish Creek - Existing Conditions L.O.S 10-vr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mg/I) (mgll) (MPN/100ml) (mgll) N135 0.27 2,52 17,88 914,84 0,05 N136 0.27 2.51 19,47 3204.94 0,05 N143 0.27 2,50 24.96 5021.68 0.06 N146 0.27 2,48 35.40 8556.13 0.09 N147 0.14 1,76 39,59 9675.11 0.10 N148 0.14 1.76 39,53 9661.76 0.10 N149 0.14 1.76 39.53 9660,83 0,10 N151 0.14 1,75 39,49 9651,01 0.10 N152 0,28 2,55 18.12 927.03 0,05 N153 0.28 2,57 18.22 931,68 0.05 N155 0.28 2.58 18,31 936,24 0.05 N158 0,28 2.63 18,63 952,32 0.05 N159 0.28 2,63 18,65 953,00 0.05 N160 0,29 2,63 18.67 954,04 0.05 N161 0.29 2.63 18,69 955.01 0,05 N290 0.31 2.92 20,68 1111,05 0.06 N323 0.14 1.76 39.56 9668.24 0,10 N325 0.29 2.64 18,71 956,09 0.05 N326 0,31 2,86 20,26 1056,53 0,05 N333 0,15 1.85 43.75 12967,39 0.09 N333a 0.15 1,84 47,25 14783.49 0,09 N334 0.13 1.72 39,43 9635.67 0,10 N335 0.15 1.82 45.71 14330,20 0,09 N337 0,08 1.14 13,04 873,08 0,06 N340 0,14 1.72 39,45 9639.95 0,10 . N474 0.15 1.83 46,98 14702.05 0.09 N503 0.29 2,69 19.07 974.35 0.05 N507 0,30 2.73 19.39 990,33 0.05 N668 0,14 1.76 39,53 9662,05 0.10 N669 0,27 2,53 17.92 916.85 0,05 N670 0.27 2,53 17.97 919,13 0,05 N671 0.28 2.62 18.60 950,67 0.05 ~ SFWMD & Collier County Immokalee storm Water Management Plan <l4-erv) -it ( CoB:= <-t=C\ . gD 0'* /3S LOC H'KfE R Alternative Analysis Fish Creek - Existing Conditions L.O.S 1 O-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/I) (mgll) (mg/I) (MPN/100ml) (mg/I) N672 0,28 2,63 18,65 953,05 0.05 N673 0.29 2,63 18,68 954,52 0.05 N674 0.29 2,64 18,71 955.86 0,05 N675 0.28 2,62 18,56 948,66 0.05 N676 0,28 2,62 18,59 950,09 0.05 Fish Creek - Existing Conditions L.O.S 25-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/I) (mg/I) (mgll) (MPN/100ml) (mg/I) N135 0.28 2,54 18,04 2537,11 0,05 N136 0.27 2,54 28,99 6277.03 0,07 N143 0,27 2,53 31,57 7139.63 0.08 N146 0,27 2,52 38,07 9252.79 0.10 N147 0,14 1,79 39,72 9707,93 0,10 N148 0,14 1,78 39,68 9698,56 0,10 N149 0,14 1,78 39,68 9697.99 0.10 N151 0.14 1,78 39,65 9691,02 0.10 N152 0.28 2.56 18,16 928.46 0,05 N153 0,28 2,57 18,24 932.22 0,05 N155 0,28 2,58 18,32 936,31 0,05 N158 0.28 2,63 18,65 952,68 0,05 N159 0,29 2,63 18,67 953,83 0,05 N160 0.29 2,64 18,71 955,64 0,05 N161 0,29 2,64 18,74 957.42 0,05 N290 0,33 3,09 21,89 1176.11 0,06 N323 0.14 1,79 39,69 9700,16 0,10 N325 0,29 2.65 18.78 959,48 0,05 N326 0.31 2,85 20,20 1053.40 0.05 N333 0,15 1,87 43,32 12900,86 0.09 N333a 0,15 1,86 46,76 14684,35 0.09 N334 0,14 1,74 39,62 9682,61 0.10 N335 0,15 1,85 45,00 14157,37 0.09 N337 0.09 1,22 13,97 908.34 0,07 N340 0,14 1,74 39,63 9684,60 0,10 N474 0.15 1,85 46.45 14591.46 0,09 N503 0.29 2,70 19,13 977,31 0,05 N507 0,30 2.74 19,43 992.33 0,05 N668 0.14 1,78 39,68 9698,71 0,10 I 1AT2 SFWMD & Collier County Immokalee Storm Water Management Plan ~~I-\e W\. ~~ l ~f!51- ~tx\ .81 cyf IDS- La c'-R N E R Alternative Analysis Fish Creek - Existing Conditions L.O.S 25-yr 12-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NHa Model Node (mgll) (mgll) (mgll) (MPN/100ml) (mgll) N669 0.28 2.55 18.07 923,96 0.05 N670 0.28 2,55 18.10 925.51 0.05 N671 0.28 2.62 18.57 948.84 0,05 N672 0.29 2.63 18,68 954,21 0.05 N673 0.29 2.64 18.73 956,67 0.05 N674 0.29 2,65 18.77 959.06 0,05 N675 0.28 2.61 18.51 945.90 0.05 N676 0,28 2,61 18,55 947.95 0,05 Fish Creek - Existina Conditions L.O.S 1 OO-vr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NHa Model Node (mgll) (mgll) (mal/) (MPN/100ml) (mall) N135 0.28 2.61 24.20 4411,31 0.06 N136 0,28 2.60 32.68 7342,43 0.08 N143 0.28 2.60 34,41 7935,33 0,09 N146 0.28 2.58 38.96 9473,81 0,10 N147 0.14 1,77 40.14 9809.15 0.10 N148 0,14 1.77 39.93 9759,40 0,10 N149 0,14 1.77 39,86 9741.47 0.10 N151 0.14 1,77 39.77 9718,77 0,10 N152 0.29 2,65 18.78 960.42 0.05 N153 0,29 2,66 18.88 965,01 0.05 N155 0.29 2.67 18,97 969.81 0,05 N158 0.30 2.73 19.38 990,03 0,05 N159 0,30 2,74 19.42 992.00 0,05 N160 0,30 2,74 19.43 992.46 0.05 N161 0,30 2.74 19.44 992.86 0.05 N214 0.11 1.49 16.59 890.59 0.08 N256 0,12 1.60 17,82 956.72 0.09 N290 0,32 3,03 21 .44 1151.99 0.06 N323 0,14 1.77 40.10 9800,02 0.10 N325 0.30 2.74 19.45 993.70 0.05 N326 0,31 2.85 20,18 1052.31 0.05 N333 0,15 1,87 43.53 12675.90 0,09 N333a 0,15 1.86 45.78 14411,97 0,09 N334 0.14 1.73 39.73 9709.17 0.10 N335 0.15 1.86 44.73 13736.83 0.09 b- SFWMD & Collier County Immokalee Storm Water Management Plan ~~*(to~ ~ .8d-- '* J3~--- LOCHNER Alternative Analysis Fish Creek - Existing Conditions L.O.S 1 OO-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/l) (mall) (mall) (MPN/1OOmll (mall) N337 0.10 1.33 15,17 977.67 0.07 N340 0.14 1,73 39.74 9711.24 0.10 N474 0.15 1,86 45.41 14296.52 0.09 N503 0.30 2.74 19.48 994,84 0.05 N507 0.30 2.75 19.49 995,53 0,05 N668 0.14 1.77 39,94 9760,97 0,10 N669 0.28 2,62 18,58 1986,88 0.05 N670 0.29 2,63 18,67 954.58 0.05 N674 0.30 2,74 19.45 99363 0.05 Madison Avenue - Existing Conditions L.O.S 5-yr 24-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/l) (mg/l) (mg/l) (MPN/1OOml) (mg/l) N109 0,19 2.33 47.33 4870,00 0,13 N110 0,07 1.44 28,18 2556,01 0.13 N197 0,19 2.33 47.31 4865,81 0,13 N263 0,19 1,92 36,87 756,78 0,04 N331 0.32 2.92 21,13 1084.56 0,05 N332 0.29 2,67 19.28 989,98 0,05 N442 0,09 1,19 70,90 9738.44 0,18 N443 0,08 1,19 65,09 8930.43 0,16 N460 0,08 0,96 61,61 8446.97 0,15 N461 0,08 0,96 61,39 8417,42 0,15 N557 0,19 2,33 47,32 4867,91 0,13 N558 0,19 2,33 47,27 4857,25 0,13 N559 0,19 2,33 47,29 4862,83 0,13 N560 0.19 2,32 47,25 4853,10 0.13 N625 0,06 1,32 25,73 2333,61 0.12 N627 0,06 1,30 25.44 2404,57 0,12 N628 0,06 1,30 25.42 3127,24 0.12 N629 0,08 0,94 60,13 8243,00 0,15 N630 0,08 0,96 59,14 8104,64 0.15 N639 0,12 1,51 30,37 3003,92 0.08 N921 0,19 2,33 47,32 4868,20 0.13 ~ SFWMD & Collier County Immokalee storm Water Management Plan ~ it It()~~ TC\" ~'3 ~+- 13Sc~ LO~HNER Alternative Analysis Madison Avenue - Existing Conditions L.O.S 1 O-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.ColI Max. NH3 Model Node (mgll) (mg/I) (mgll) (MPN/100ml) (mg/I) N109 0,20 2.39 49.04 5272.09 0.13 N110 0,07 1.41 27.48 2492.66 0.13 N197 0.20 2.39 49.04 5270.73 0.13 N273 0.20 2.38 50.31 6340.89 0.13 N443 0.10 1.25 53,63 7275.74 0.13 N460 0.15 1,77 51.41 6936.91 0.13 N461 0.15 1,80 51.41 6937.08 0,13 N557 0.20 2,39 49.04 5271,36 0.13 N558 0.20 2,38 49,04 5268.17 0,13 N559 0.20 2,39 49,04 5269.84 0.13 N560 0.20 2,38 50,32 6358.10 0.13 N625 0.06 1,32 25,82 2341.79 0.12 N627 0,06 1,32 25,78 2338.64 0.12 N628 0,06 1,32 25,79 2338.67 0.12 N629 0.18 2,13 50,84 6851.69 0.13 N630 0,19 2,35 50,29 6319.83 0.13 N639 0.20 2,38 50,30 6325,68 0.13 N921 0,20 2,39 49,04 5271.68 0.13 Madison Avenue - Existing Conditions L.O.S 25-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/I) (mg/I) (mg/I) (MPN/100ml) (mgll) N109 0,20 2.41 49,62 5338.44 0.13 N110 0,07 1.41 27,54 2497.78 0.13 N197 0,20 2,41 49,61 5336.26 0.13 N273 0,20 2,39 50,91 6659,80 0.13 N443 0,09 1.27 56,61 7703.42 0.14 N460 0,14 1.65 54,96 7438.60 0.14 N461 0,14 1.71 54,96 7438.18 0.14 N557 0,20 2,41 49,62 5337.20 0.13 N558 0,20 2.41 49,60 5332.38 0.13 N559 0,20 2.41 49,61 5334.92 0.13 N560 0,20 2.39 50,91 6669.92 0,13 N625 0,06 1,32 25,83 2342.48 0,12 N627 0,06 1.32 25.81 2340,57 0,12 N628 0,06 1.32 25.81 2340.68 0.12 1A15 SFWMD & Collier County Immokalee Storm Water Management Plan -=r:km #-/ (069- ~ ~ BL( (j-t- 13S- L 0 C H"--r<J E R Alternative Analysis Madison Avenue - Existing Conditions L.O.S 25-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mall) (mg/l) (mgll) (MPN/100ml) (mgll) N629 0,17 2,08 54.67 7393,59 0,14 N630 0,19 2,36 50.92 6648.98 0.13 N639 0,20 2,39 50,90 6650.60 0.13 N921 0,20 2.41 49,62 5337,83 0,13 Madison Avenue - Existing Conditions L.O.S 100-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mg/l) (mg/l) (MPN/100ml) (mgll) N109 0,20 2,39 49,30 5315,69 0,13 N110 0,07 1.42 27,66 2508,62 0,13 N197 0,20 2,39 49,29 5313.43 0,13 N273 0,20 2,37 51,62 7203,24 0,13 N443 0.08 1.29 61,49 8402.61 0.15 N460 0,11 1,30 59,74 8111.30 0,15 N461 0.12 1.43 59,74 8111,73 0,15 N557 0.20 2,39 49,29 5314,28 0.13 N558 0,20 2.39 49,27 5309,91 0.13 N559 0.20 2,39 49,28 5312,22 0,13 N560 0,20 2,37 51,62 7207.65 0.13 N625 0.06 1,32 25,81 2341.04 0,12 N627 0,06 1,32 25,78 2338.62 0.12 N628 0,06 1.32 25,79 2338.73 0,12 N630 0,19 2,34 51,87 7205,10 0.13 N639 0.20 2,37 51,61 7199.48 0,13 N921 0,20 2,39 49,30 5315,14 0,13 Airport - Existing Conditions L.O.S 5-yr 24-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/l) (mg/l) (mg/l) (MPN/100ml) (mg/l) N01 0,19 2,32 47,04 4823.40 0,13 N02 0,19 2,32 47,05 4825,04 0,13 N03 0.19 2,32 47,05 4825.37 0.13 N04 0,19 2.32 47,04 4823,59 0,13 N102 0,19 2,31 47.01 4818,83 0.13 N103 0.19 2,31 46,98 4814.52 0,13 1Ai6 SFWMD & Collier County Immokalee Storm Water Management Plan L~ ~~\Ges1- ~.~S*/3~ LOCHNER Alternative Analysis Airport - Existing Conditions L.O.S 5-yr 24-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NHa Model Node (mgll> (mgll> (mg/I) (MPN/100ml) (mg/I) N104 0,19 2.30 46,77 4783.11 0.13 N105 0.19 2.28 46,04 4636,82 0.13 N106 0.19 2,32 47,10 4832.21 0.13 N107 0.19 2,32 47.20 4847.75 0.13 N109 0.19 2.33 47.33 4870.00 0.13 N162 0.19 2.32 47.10 4817.27 0.13 N163 0,19 2.31 46.70 4734.51 0.13 N164 0.19 2.30 46.63 4721.04 0,13 N165 0.19 2.30 46,61 4715,62 0,13 N166 0.19 2.30 46.54 4704.15 0,13 N167 0,19 2.30 94.65 10350,92 0,13 N583 0,19 2,35 47.50 4899.33 0.13 N587 0.19 2.30 46,51 4699.87 0,13 N588 0,19 2.30 46.48 4695.45 0.13 N591 0,19 2.33 47.04 5337.96 0,13 N592 0,19 2.29 46.27 4644.74 0.13 N594 0,19 2.29 46.21 4638,90 0.13 N595 0,19 2.29 46,17 4634,21 0.13 N605 0.19 2.33 47,30 4864,04 0.13 N606 0,19 2.33 47,28 4861,13 0.13 N608 0.19 2,32 47.25 4855,97 0,13 N609 0,19 2,32 47,23 4853.22 0.13 N610 0,19 2,32 47.22 4851 .42 0.13 N661 0,19 2.32 47.20 4847.72 0.13 N663 0,19 2.30 63.64 7042,46 0.13 N664 0,19 2,29 64.18 7104,01 0.13 N681 0,19 2,30 46,54 4704.13 0.13 N682 0,19 2,30 46,55 4706,53 0.13 N683 0.19 2,30 46.58 4710.69 0.13 N684 0,19 2,30 46,60 4713,81 0,13 N685 0,19 2,31 46,69 4732.81 0,13 N686 0,19 2.31 46.71 4737.34 0,13 N901 0,19 2.31 46.73 4740.34 0,13 N902 0,19 2.32 47.20 4837.39 0.13 N903 0.19 2.33 47.38 4875.12 0,13 N904 0,19 2.34 47.64 4929.10 0,13 N905 0.19 2,33 47.46 4892,07 0,13 N906 0.19 2,33 47.44 4888.66 0,13 1A17 SFWMD & Collier County Immokalee storm Water Management Plan .~YYI =t:k llo &. t:q ,~ tQ 0{ 13:; LOCHNER Alternative Analysis Airport - Existing Conditions L.O.S 5-yr 24-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mgll) (mgll) (MPN/100ml) (mg/I) N907 0,19 2,33 47.43 4886,98 0.13 N908 0,19 2,33 47.42 4884.73 0,13 N909 0,19 2,33 47.40 4880,84 0,13 N910 0,19 2,33 47,37 4875,38 0.13 N911 0,19 2,33 47,34 4871,87 0,13 N961 0,19 2,33 47,47 4894,16 0.13 N963 0,38 4,66 93.58 9253,53 0,26 Airport - Existing Conditions L.O.S 1 D-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mg/I) (mg/I) (MPN/1 DOml) (mg/I) N01 0,20 2,38 49,00 5264,36 0.13 N02 0,20 2,38 49,00 5264,56 0.13 N03 0,20 2,38 4900 5264,61 0,13 N04 0,20 2,38 49,00 5264,39 0.13 N102 0,20 2,38 49,00 5263,54 0,13 N103 0,20 2,38 49,00 5262,77 0,13 N104 0,20 2,38 48,98 5257,21 0.13 N105 0,20 2,37 48,78 5185,75 0,13 N106 0,20 2,38 49,00 5265.72 0,13 N107 0,20 2,38 49,02 5268,34 0,13 N109 0,20 2,39 49,04 5272,09 0,13 N162 0,20 2,39 49,07 5239.14 0,13 N163 0,20 2,37 48,59 5117,12 0,13 N164 0,20 2,37 48.49 5095,05 0,13 N165 0,19 2,37 48.45 5085,49 0,13 N166 0,19 2.37 48.40 5076,04 0,13 N167 0,19 2,36 93.22 10183,70 0.13 N583 0.20 2.39 49,06 5278.03 0,13 N587 0,19 2,37 48,38 5072,93 0,13 N588 0,19 2,37 48,37 5070,13 0.13 N591 0.20 2.38 49,34 5152.38 0,13 N592 0,19 2.36 48.83 5099.56 0.13 N593 0,19 2,36 48,80 5096.19 0,13 N594 0.19 2,36 48,78 5094,69 0.13 N595 0,19 2,36 48.77 5093,30 0,13 N605 0,20 2,38 49,03 5271,10 0.13 ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~_:-\-e J'Y\ i{ ( (~ 6::t- 15, ~(+ ~ 13S- LOCHNER Alternative Analysis Airport - Existing Conditions L.O.S 1 O-yr 72-h r SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mgll) (mg/I) (MPN/100ml) (mg/I) N606 0.20 2.38 49.03 5270.61 0.13 N608 0.20 2.38 49.02 5269,74 0,13 N609 0.20 2.38 49,02 5269,30 0,13 N610 0.20 2,38 49,02 5268,99 0,13 N661 0.20 2,38 49,02 5268,33 0,13 N663 0,19 2,36 59,58 6578.25 0,13 N664 0,19 2,36 60,02 6627.84 0,13 N681 0,19 2,37 48,40 5076.02 0,13 N682 0.19 2,37 48,41 5078.14 0.13 N683 0.19 2,37 48.43 5081,26 0.13 N684 0.19 2,37 48.44 5083.63 0,13 N685 0.20 2,37 48.58 5115,84 0.13 N686 0,20 2.37 48.59 5119.08 0.13 N901 0,20 2.37 48.60 5121.33 0.13 N902 0.20 2,39 49,07 5249,44 0.13 N903 0,20 2,39 49.09 5269,25 0,13 N904 0.20 2.39 49,16 5295.94 0,13 N905 0.20 2.39 49.06 5276.33 0.13 N906 0,20 2.39 49.06 5275.70 0.13 N907 0.20 2.39 49.06 5275,33 0.13 N908 0,20 2.39 49.05 5274.90 0,13 N909 0,20 2.39 49.05 5274.07 0,13 N910 0,20 2.39 49.04 5272.94 0,13 N911 0.20 2.39 49,04 5272.44 0,13 N961 0,20 2,39 49,06 5276.73 0,13 N963 0,38 4,66 93,61 9256.06 0,26 Airport - Existing Conditions L.O.S 25-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/I) (mg/I) (mgll) (MPN/100ml) (mg/I) N01 0,20 2,40 49,57 5327.63 0.13 N02 0,20 2,40 49,57 5327.93 0.13 N03 0,20 2,40 49.57 5328,01 0.13 N04 0,20 2,40 49.57 5327.67 0.13 N102 0,20 2,40 49.56 5326.52 0.13 N103 0.20 2,40 49.55 5325.47 0.13 N104 0.20 2.40 49,51 5317,89 0.13 1M9 SFWMD & Collier County Immokalee Storm Water Management Plan ~-\0)\~\ l.Q 6-::t- ~~~R ~. 13S- Alternative Analysis Airport - Existing Conditions L.O.S 25-yr 72-h r SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NHa Model Node (mgll) (mg/l) (mg/l) (MPN/100ml) (mgll) N105 0,20 2.39 49.14 5239.16 0.13 N106 0.20 2.40 49.58 5329.55 0.13 N107 0,20 2,41 49,60 5333,17 0.13 N109 0.20 2.41 49,62 5338.44 0,13 N162 0,20 2,40 49,39 5283,87 0.13 N163 0,20 2,38 48.78 5155,50 0,13 N164 0.20 2,38 48,67 5132,80 0,13 N165 0,20 2,37 48,62 5123.02 0.13 N166 0,20 2,37 48,57 5113.60 0,13 N167 0,19 2.37 93,31 10184,28 0,13 N558 0,20 2.41 49.60 5332.38 0.13 N583 0,20 2.41 4966 5346,81 0,13 N587 0.20 2,37 48,56 5110,55 0,13 N588 0,20 2,37 48,54 5107.83 0,13 N591 0,20 2,39 48,66 5195,30 0,13 N592 0,19 236 48,59 5123,63 0,13 N593 0,19 2,36 48,59 5109,07 0.13 N594 0,19 2,36 48,58 5103,08 0.13 N595 0.19 2,36 48.57 5101,43 0,13 N605 0,20 2.41 49,62 5337,05 0,13 N606 0,20 2,41 49,61 5336,37 0,13 N608 0,20 2.41 49,61 5335,16 0.13 N609 0,20 2.41 49,60 5334,51 0.13 N610 0,20 2,41 49,60 5334,08 0,13 N661 0,20 2.41 49,60 5333.16 0,13 N663 0,19 2,37 61,84 6837.07 0.13 N664 0,19 2,37 62.28 6886,86 0.13 N681 0,20 2,37 48,57 5113,59 0,13 N682 0,20 2,37 48.58 5115,68 0,13 N683 0,20 2,37 48.60 5118,78 0,13 N684 0,20 2,37 48,61 5121.14 0,13 N685 0,20 2,38 48,77 5154,16 0,13 N686 0.20 2,38 48,79 5157.55 0.13 N901 0,20 2.38 48,80 5159,91 0,13 N902 0.20 2.40 49.45 5298,28 0,13 N903 0,20 2.41 49,58 5327,60 0,13 N905 0,20 2,41 49,65 5344,36 0.13 N906 0,20 2.41 49,65 5343.46 0,13 huo SFWMD & Collier County Immokalee storm Water Management Plan ~-*-LlDb1-- ~ ~~q o-t I~~- LOCHNER Alternative Analysis Airport - Existing Conditions L.O.S 2S-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/I) (mg/I) (mgll) (MPN/100ml) (mgll) N907 0,20 2.41 49,65 5342.96 0,13 N908 0.20 2,41 49.64 5342.35 0,13 N909 0.20 2.41 49,64 5341.22 0.13 N910 0.20 2.41 49.63 5339,66 0,13 N911 0,20 2.41 49.63 5338.93 0.13 N961 0.20 2,41 49,66 5344.92 0.13 N963 0.38 4.65 93,46 9241.82 0.26 Airport - Existing Conditions L.O.S 100-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mg/l) (mgll) (MPN/100ml) (mg/I) N01 0.20 2.39 49.25 5306,10 0.13 N02 0.20 2,39 49,25 5306.36 0.13 N03 0.20 2.39 49,25 5306,43 0.13 N04 0.20 2,39 49,25 5306.14 0.13 N102 0.20 2,39 49.24 5305.13 0,13 N103 0.20 2.39 49.24 5304,22 0,13 N104 0,20 2.39 49,20 5297,65 0,13 N105 0,19 2.37 48.92 5228.63 0,13 N106 0.20 2,39 49.25 5307,54 0,13 N107 0.20 2.39 49.27 5310,89 0.13 N109 0.20 2.39 49,30 5315,69 0.13 N162 0,20 2,38 49.07 5261,75 0.13 N163 0.19 2.36 48.50 5136,07 0,13 N164 0.19 2,36 48.40 5113.03 0.13 N165 0,19 2.36 48.35 5102.90 0.13 N166 0.19 2.36 48,31 5093.58 0.13 N167 0.19 2,35 92,97 10152,09 0.13 N583 0,21 2,52 50,55 5323.10 0.14 N587 0,19 2,36 48.29 5090,72 0.13 N591 0,19 2,34 48.83 5201,23 0.13 N592 0.19 2.34 48,76 5145.79 0,13 N593 0.19 2,34 48.75 5144.66 0,13 N594 0.19 2,34 48.74 5143.52 0,13 N595 0.19 2.34 48.73 5142.39 0,13 N605 . 0.20 2.39 49,29 5314,43 0,13 N606 0.20 2.39 49,29 5313,80 0,13 1A21 SFWMD & Collier County Immokalee Storm Water Management Plan .=c~ ry\ .4:\:- i to 6~~ -rc\ ,90 ~ 15~ LOC~NER Alternative Analysis Airport - Existing Conditions L.O.S 100-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mgll) (mg/I) (MPN/100ml) (mg/I) N608 0,20 2.39 49,28 5312.68 0.13 N609 0,20 2,39 49,28 5312,12 0,13 N610 0.20 2.39 49.28 5311,73 0.13 N661 0.20 2,39 49,27 5310,88 0,13 N663 0,19 2.35 64,23 7123.06 0,13 N664 0.19 2,35 64,72 7177.73 0,13 N681 0,19 2,36 48,31 5093,56 0,13 N682 0,19 2,36 48,32 5095,62 0.13 N683 0,19 2,36 48.33 5098.67 0.13 N684 0.19 2.36 48,35 5100,98 0.13 N685 0,19 2,36 48,50 5134.74 0.13 N686 0,19 2,36 48,51 5138,10 0,13 N901 0.19 2.36 48,52 5140.43 0.13 N902 0.20 2.38 49,13 5275,73 0,13 N903 0,20 2,39 49,26 5304.18 0,13 N904 0.20 2.42 49,42 5344,43 0.13 N905 0.20 2,39 49,32 5320,96 0,13 N906 0,20 2,39 49,32 5320,20 0,13 N907 0,20 2,39 49,32 5319.74 0,13 N908 0,20 2,39 49,32 5319,24 0,13 N909 0.20 2,39 49,31 5318.20 0.13 N910 0,20 2,39 49,30 5316,77 0,13 N911 0.20 2_39 49,30 5316,14 0,13 N961 0,20 2,39 49,32 5321,44 0.13 N963 0,38 4,64 93,24 9219,96 0,26 N588 0,19 2,36 48.28 5088,27 0,13 State Road 29 - Existing Conditions L.O.S 5-yr 24-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mg/I) (mg/I) (MPN/100ml) (mgll) N173 0,19 2,27 45,94 4625,82 0,13 N174 0,19 2,26 45,72 4601.48 0,13 N175 0,19 2.26 45,68 4597,38 0,12 N596 0,19 2,27 45,95 4627,08 0,13 N597 0,19 2,28 46,01 4632,94 0,14 N598 0.19 2,28 45,96 4627,52 0,13 N599 0,29 2,86 45,90 4621 .41 0,13 ~ SFWMD & Collier County Immokalee Storm Water Management Plan --:r=-Wm * [loJ~~~- ~. CJ/ ~135 LOCHNER Alternative Analysis State Road 29 - Existing Conditions L.O.S 5-yr 24-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mgll) (mgll) (MPN/1 DDml) (mgll) N600 0.19 2,27 45,84 4615,16 0,13 N601 0.19 2,27 45,80 4610,90 0,13 N602 0.23 3.20 45.77 67004.03 0,13 N603 0.19 2.26 45.72 4601.76 0.13 N604 0.19 2.26 45.66 4595.60 0.12 N912 0,19 2,26 45.65 4594.21 0.12 N913 0,20 2.30 42,49 4213,95 0,12 State Road 29 - Existing Conditions L.O.S 10-yr 72-hr SWMM Max.OP04 Max. TN Max. TSS Max. E.ColI Max. NH3 Model Node (mgll) (mg/l) (mg/l) (MPN/10Dml) (mgll) N169 0.20 2,37 48,77 5182.99 0.13 N170 0.20 2,37 48,74 5176.71 0.13 N171 0.20 2,37 48.74 5175.54 0.13 N173 0.20 2.37 48.77 5182,99 0.13 N174 0,20 2.37 48.74 5176.70 0.13 N175 0.20 2,37 48.74 5175.50 0,13 N597 0.20 2,37 48.78 5184,79 0,13 N598 0,20 2,37 48.78 5183,53 0.13 N599 0.29 2,88 48.77 5181,61 0.13 N600 0,20 2,37 48.76 5180,04 0,13 N601 0.20 2,37 48.75 5178.95 0,13 N602 0.25 3.40 48.75 71280.26 0,13 N603 0,20 2,37 48,74 5176,80 0.13 N604 0.20 2,37 48,74 5174.76 0,13 N912 0.20 2,37 48.74 5174.12 0,13 N913 0,20 2,39 48.10 5035.51 0,13 N920 0,20 2.37 48.77 5179,04 0,15 State Road 29 - Existing Conditions L.O.S 25-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.ColI Max. NH3 Model Node (mgll) (mgll) (mg/l) (MPN/1DDml) (mgll) N169 0.20 2,39 49.12 5235,75 0,13 N170 0.20 2,39 49,08 5228,56 0,13 N171 0.20 2.39 49.08 5227.24 0,13 IAn SFWMD & Collier County Immokalee Storm Water Management Plan r:_\_, ..-~ (V\ -~ft t (~ 6:; L~H~f~ of-' /3<) Alternative Analysis State Road 29 - Existing Conditions L.O.S 25-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/l) (mg/l) (mg/l) (MPN/100ml) (mgll) N173 0,20 2,39 49,12 5235.74 0.13 N174 0.20 2.39 49,08 5228.54 0.13 N175 0.20 2,39 49.08 5227,18 0.13 N596 0,20 2,39 49,12 5236.18 0.13 N597 0.20 2,39 49,13 5237,98 0,14 N598 0,20 2,39 49,12 5236.41 0.13 N599 0,29 2,84 49.11 5234,16 0.13 N600 0,20 2.39 49,10 5232,37 0,13 N601 0,20 2,39 49.10 5231,14 0,13 N602 0.25 3,39 49,09 71185,43 0.13 N603 0,20 2,39 49,08 5228,66 0,13 N604 0,20 2,38 49,07 5226,13 0.13 N913 0,20 2.40 48,32 5084,11 0.13 N920 0,20 2,38 49,08 5225,73 0,15 State Road 29 - Existing Conditions L.O.S 100-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/l) (mg/l) (mg/l) (MPN/100ml) (mgll) N105 0.19 2,37 48,92 5228,63 0,13 N169 0,19 2,37 48,91 5226,02 0,13 N170 0,19 2,37 48,88 5220.35 0,13 N171 0,19 2,37 48,88 5219,74 0,13 N173 0.19 2.37 48,91 5226,01 0,13 N174 0,19 2,37 48,88 5220.34 0,13 N175 0,19 2,37 48,88 5219,70 0,13 N596 0,19 2,37 48,91 5226,35 0,13 N597 0,19 2,37 48,91 5227,72 0,14 N598 0,19 2,37 48,91 5226,52 0,13 N599 0,28 2.76 48,89 5221,68 0,13 N600 0,19 2,37 48,89 5221.22 0,13 N601 0.19 2.37 48,89 5221.04 0,13 N602 0.25 3,38 48,89 70807.22 0.13 N603 0,19 2,37 48,88 5220,39 0,13 N604 0,19 2,37 48.88 5218,97 0,13 N912 0,19 2,37 48,88 5218.59 0,13 N913 0,20 2,39 44,94 4670.77 0.12 b- SFWMD & Collier County Immokalee Storm Water Management Plan '~ -=t+-lIcJBi- ~~~~E'gf- (SS Alternative Analysis Immokalee Road - Existina Conditions L.O.S 5-yr 24-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mall) (mg/l) (mall) (MPN/100ml) (mall) N229 0.14 2.03 45.22 2655.34 0.05 N231 0.00 0.04 1.08 373,46 0,00 N245 0.20 2.32 60.33 20833.45 0.05 N333 0,13 1.74 43.02 11833.77 0.09 N518 0,10 1.24 80.85 11106,33 0.20 N519 0,00 0.01 0.50 67,11 0,00 N523 0,00 0,00 0,00 0.00 0.00 N524 0.20 2.31 60.11 20756.88 0.05 N525 0.13 1.71 41.56 11388.48 0.08 N526 0.12 1.62 40.02 10954.99 0.08 N527 0.12 1.61 39.88 10920.12 0.08 N528 0.10 1,42 35.37 26328.15 0,07 N529 0.10 1,65 33,48 45626,43 0.07 N623 0.10 1,57 33.44 43401.05 0.07 Immokalee Stormwater Master Plan Immokalee Road - Existina Conditions L.O.S 1 O-yr 72-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.ColI Max. NH3 Node (mall) (mall) (mall) (MPN/100ml) (mgll) N229 0.15 2,05 46.29 3859,33 0.06 N231 0.02 0.18 4.79 1653,49 0.00 N238 0.19 2.29 59.50 20546.33 0,05 N245 0,19 2.29 59,50 20546.36 0,05 N333 0.15 1,85 43.75 12967,39 0.09 N333a 0.15 1,84 47.25 14783.49 0,09 N518 0,09 1.12 70,82 9699.36 0,18 N519 0.06 0.73 44,79 6108.73 0,11 N524 0.19 2,28 59,35 20494.78 0,05 N526 0.15 1.83 41,63 11425,37 0,08 N527 0.15 1,83 41,57 11410,54 0.08 N528 0.14 1,76 40.15 27723,45 0.08 N529 0,14 1.76 40,13 45299,31 0,08 N539 0.19 2,29 59,47 20537.37 0.05 N540 0.19 2.29 59.46 20532,24 0.05 N623 0.14 1,76 40.13 44643,61 0,08 Immokalee Stormwater Master Plan Immokalee Road - Existing Conditions L.O.S 25-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mg/l) (mg/l) (mg/l) (MPN/100ml) (mg/l) N229 0.15 2.05 46.29 4372.09 0,06 N231 0.02 0,21 5,36 1851.93 0.00 b- SFWMD & Collier County Immokalee Storm Water Management Plan ~---~'(Y\~/4! B:::J- '1X"\ _CfLI ~I 13S- L<JCHNER Alternative Analysis Immokalee Stormwater Master Plan Immokalee Road - Existing Conditions L.O.S 25-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 ModeJ Node (mgll) (mg/l) (mg/l) (MPN/1 DDml) (mgll) N238 0,19 2,29 59,52 20553,69 0,05 N245 0,19 2,29 59,52 20553,72 0.05 N333 0,15 1,87 43,32 12900,86 0,09 N333a 0,15 186 46,76 14684.35 0,09 N518 0,09 1,14 72.84 9988.64 0.18 N519 0,06 0,80 50,83 6964,65 0.13 N524 0,19 2,28 59,35 20493,65 0,05 N525 0,15 1,87 42,65 11732.52 0,09 N526 0,15 1,86 42.08 11604,39 0.08 N527 0.15 1,86 42,01 11586,99 0,08 N528 0.14 1,79 40,24 28196.39 0,08 N529 0,14 1,79 40,23 45460.99 0.08 N539 0,19 2,29 59.49 20543,97 0,05 N540 0,19 2,29 59,48 20539,82 0.05 N623 0.14 1,79 40,23 44858.48 0,08 Immokalee Stormwater Master Plan Immokalee Road - Existing Conditions L.O.S 100-yr 72-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mg/l) (mg/l) (mgll) (MPN/1DDml) (mg/l) N229 0.15 2,05 46,25 5146.11 0,06 N231 0.02 0,24 6,24 2154,68 0.01 N245 0,19 2.29 59,55 20563,73 0.05 N333 0.15 1,87 43,53 12675,90 0.09 N518 0,10 1,19 76,84 10547.24 0.19 N519 0.08 0,94 61,11 8389,64 0,15 N523 0,00 0,00 0,00 0,00 0,00 N524 0.19 2,28 59.31 20479,60 0.05 N525 0,15 1,87 43,29 12021.02 0.09 N526 0,15 1,87 42.85 11907,35 0.09 N527 0,15 1,86 42,77 11889,03 0,08 N528 0,14 1,81 41,03 29081,14 0,08 N529 0,14 1,81 41,00 45575,87 0,08 N623 0,14 1,81 41,00 45011,28 0.08 hm- SFWMD & Collier County Immokalee Storm Water Management Plan ~*I(d)1- .lX-\ /9\ * I~~ LO'c1-i N E R Alternative Analysis Main Street - Existing Conditions L.O.S 5-yr 24-hr SWMM Model Max. OPO.. Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mg/l) (mall) (mg/l) (MPN/100ml) (mall) N177 0.13 2.01 42,02 29708.77 0.12 N178 0.13 2.00 42.02 29673.74 0.12 N179 0,12 1.91 42.04 28376.63 0.12 N180 0,12 1.91 42.05 28358,62 0.12 N181 0.12 1,87 42.07 27779,49 0.12 N182 0.12 1,87 42.07 27758.45 0.12 N183 0.12 1,86 42.17 26934.52 0,12 N184 0,12 1,86 42,17 26927.73 0,12 N185 0.12 1,91 42,18 27484.36 0.12 N187 0.13 2,04 43.63 29431.78 0.13 N188 0.13 2,04 43,67 29448.36 0.13 N190 0.14 2,21 47.29 31864.36 0.14 N192 0.14 2.22 47.31 31877,21 0.14 N193 0.15 2.27 48.46 32686.44 0.14 N207 0.13 2.08 42,00 30735.93 0,12 N209 0.15 2,24 47.91 32296.19 0,14 N210 0,04 0.78 8.47 6788.47 0,05 N211 0.04 0,78 8.47 6788,38 0.05 N733 0,04 0,72 7,76 6219,91 0.04 Main Street - Existing Conditions L.O.S 10-yr 72-hr SWMM Model Max. OPO.. Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mg/l) (mall) (mg/l) (MPN/100ml) (mg/l) N177 0,13 2,05 40.88 30332,29 0.12 N178 0.13 2.05 40.89 30277,62 0.12 N179 0.12 1,94 40.95 28768,46 0.12 N180 0,12 1.94 40,95 28733.29 0.12 N181 0.12 1,90 41,02 28084.07 0.12 N182 0.12 1.90 41.02 28070,23 0,12 N183 0.12 1.88 42.80 27167.71 0,13 N184 0,12 1.88 42,82 27163.43 0.13 N185 0.13 1.94 44,37 27565,01 0.13 N187 0.14 2,11 48.35 29956,34 0.14 N188 0.14 2.11 48,39 29976.37 0.14 N190 0.15 2.30 52,72 32678.72 0.15 N192 0.15 2.30 52.75 32692.66 0.15 N193 0,16 2,36 53,89 33556,24 0,16 N207 0,14 2.12 40.85 31407.32 0.12 N209 0.14 2,10 45.15 30139.55 0.13 b- SFWMD & Collier County Immokalee Storm Water Management Plan ~ :::k\t1 :It: (to f3 -::; ~~.9~ ~ J~~ LO'C-?i N E R Alternative Analysis Main Street - Existina Conditions L.O.S 25-yr 72-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mg/l) (mgll) (mgll) (MPN/100ml) (mg/l) N177 0.13 2.07 40,18 30588.76 0,12 N178 0,13 2,06 40.19 30541,59 0.12 N179 0,13 1.96 40,55 28993,77 0,12 N180 0.13 1,96 40,57 28962,46 0,12 N181 0,12 1,91 40,97 28222.23 0,12 N182 0.12 1,90 40.99 28200,46 0,12 N183 0,12 1,84 43,29 27175,80 0,13 N184 0.12 1,84 43.28 27170.70 0.13 N185 0,12 1,87 43,95 26918,74 0,13 N187 0,13 1,94 44.35 27431,95 0.13 N188 0,13 1.94 44,32 27426,35 0.13 N190 0,13 1,95 43,13 27873,90 0.13 N192 0.13 1,95 43,07 27851,51 0.13 N193 0,12 1,91 41,51 27256,88 0,12 N207 0,14 2,14 39.99 31697.98 0,12 N209 0.12 1,82 37,26 26395,86 0,11 Main Street - Existing Conditions L.O.S 100-yr 72-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mall) (mall) (mall) (MPN/100ml) (mall) N177 0,13 2,10 40,51 31015.55 0,12 N178 0.13 2,09 40.51 30997.54 0.12 N179 0.13 2,00 40,49 29561,79 0.12 N180 0,13 2,00 40,48 29519,28 0.12 N181 0,12 1,94 40,45 28678.24 0.12 N182 0,12 1,94 40.45 28665,24 0,12 N183 0,12 1,83 40,01 27135,60 0,12 N184 0,12 1,83 40.00 27129,86 0,12 N185 0,12 1.81 39,53 26875,01 0.12 N187 0,12 1.82 38,37 26632,97 0,11 N188 0,12 1,82 38,36 26633,00 0,11 N190 0,12 1,81 37,53 26598,55 0,11 N192 0,12 1,81 37,53 26588,75 0,11 N193 0,12 1,80 37.47 26414.67 0.11 N207 0.14 2,17 40,51 32052,29 0.12 N209 0,12 1,80 37,23 26365,25 0.11 b- SFWMD & Collier County Immokalee storm Water Management Plan L.-tent ~ !Ln(3 ~ 1x1 j q 1- .,{2 /3S- LocFfNER Alternative Analysis 7th Street - Existing Conditions L.O.S 5-yr 24-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mgll) (mgll) (mg/l) (MPN/100ml) (mgll) N207 0,13 2,08 42,00 30735.93 0.12 N476 0,09 1,12 72.58 9969.22 0.18 N477 0,09 1,12 72.57 9969.01 0.18 N478 0,09 1,12 72.52 9961.06 0.18 N479 0.09 1.12 72,52 9961,08 0.18 N480 0.09 1.13 73,69 10122.68 0.18 N481 0.09 1.13 73,72 10125,93 0.18 N482 0.10 1.22 79,00 10852,17 0.20 N484 0.10 1.22 79,48 10917,76 0.20 N485 0,10 1.28 83,48 11467,05 0.21 N486 0.09 1,12 73,00 10026.89 0,18 N487 0.09 1.12 73,00 10026.94 0,18 N488 0.09 1.12 72.97 10023,42 0,18 N489 0.09 1.12 72.97 10023,31 0,18 N490 0,09 1,12 72,89 10012,59 0,18 N491 0.09 1,12 72.89 10012,55 0,18 N492 0.09 1.12 72.78 9997,50 0.18 N493 0.09 1.12 72.78 9997.39 0.18 N494 0.09 1.12 72.75 9993.06 0.18 N495 0,09 1,12 73.04 10032.78 0.18 N496 0,09 1,12 73.03 10032.25 0.18 N506 0,09 1,12 73.01 10029.15 0.18 N573 0,09 1,12 72.75 9993.04 0.18 N576 0,09 1,12 73.01 10029.02 0.18 7th Street - Existing Conditions L.O.S 10-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mgll) (mg/l) (MPN/100ml) (mgll) N476 0.09 1,12 72.83 10003,55 0,18 N477 0.09 1,12 72.83 10003,61 0,18 N478 0,09 1,12 72,83 10004,39 0,18 N479 0,09 1,12 72.83 10004.54 0,18 N480 0.09 1.15 74.66 10255.03 0.18 N481 0.09 1.15 74.67 10257.43 0,18 N482 0.10 1,23 80.16 11011.44 0,20 N484 0,10 1,23 80.23 11019,94 0,20 N485 0.10 1,28 83.05 11408.27 0,21 I-m- SFWMD & Collier County Immokalee Storm Water Management Plan ~n\ .~..((cBq -;::c . 9~ D* /3 ")- LOCHNER Alternative Analysis 7th Street - Existing Conditions L.O.S 10-yr 72-hr SWMM Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Model Node (mgll) (mgll) (mg/l) (MPNI100ml) (mgll) N486 0.09 1.12 72.74 9991.72 0.18 N487 0.09 1.12 72.74 9991.57 0.18 N488 0.09 1.12 72.75 9993.25 0.18 N489 0.09 1.12 72.75 9993.14 0.18 N490 0.09 1.12 72.78 9996.88 0.18 N491 0.09 1.12 72.78 9996.77 0.18 N492 0.09 1.12 72.80 10000.31 0.18 N493 0.09 1.12 72.80 10000.42 0.18 N494 0.09 1.12 72.81 10001.18 0.18 N495 0.09 1.12 72.71 9988.24 0.18 N496 0.09 1.12 72.72 9988.58 0.18 N506 0.09 1.12 72.73 9989.75 0.18 N573 0.09 1.12 72.81 10001.23 0.18 N576 0.09 1.12 72.73 9989.89 0.18 7th Street - Existing Conditions L.O.S 25-yr 72-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mg/l) (mgll) (mg/l) (MPN/100ml) (mg/l) N476 0.09 1.12 72.83 10004.00 0.18 N477 0.09 1.12 72.83 10004.05 0.18 N478 0.09 1.12 72.83 10004.77 0.18 N479 0.09 1.12 72.84 10004.98 0.18 N480 0.09 1.15 74.82 10278.01 0.19 N481 0.09 1.15 74.81 10276.43 0.18 N482 0.10 1.25 81.18 11150.91 0.20 N484 0.10 1.25 81.04 11131.51 0.20 N485 0.10 1.29 83.59 11481.81 0.21 N486 0.09 1.12 72.75 9992.55 0.18 N487 0.09 1.12 72.74 9992.43 0.18 N488 0.09 1.12 72.76 9993.99 0.18 N489 0.09 1.12 72.76 9993.93 0.18 N490 0.09 1.12 72.78 9997.68 0.18 N491 0.09 1.12 72.78 9997.60 0.18 N492 0.09 1.12 72.81 10001.06 0.18 N493 0.09 1.12 72.81 10001.15 0.18 N494 0.09 1.12 72.81 10001.81 0.18 1A30 SFWMD & Collier County Immokalee Storm Water Management Plan '~l\~( 06<7, ~~~R 0(' 135 Alternative Analysis 7th Street - Existing Conditions L.O.S 25-yr 72-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mgll) (mg/l) (mg/l) (MPN/100ml) (mg/l) N495 0.09 1.12 72.72 9989.03 0.18 N496 0.09 1.12 72.72 9989.39 0.18 N506 0.09 1.12 72.73 9990.66 0.18 N573 0.09 1.12 72.81 10001.84 0.18 N576 0.09 1.12 72.73 9990.80 0.18 7th Street - Existing Conditions L.O.S 1 OO-yr 72-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mg/l) (mg/l) (mg/l) (MPN/100ml) (mg/l) N207 0.14 2.17 40.51 32052.29 0.12 N476 0.09 1.12 72.83 10004.69 0.18 N477 0.09 1.12 72.83 10004.74 0.18 N478 0.09 1.12 72.84 10005.36 0.18 N479 0.09 1.12 72.84 10005.55 0.18 N480 0.10 1.18 76.87 10558.68 0.19 N481 0.10 1.18 76.93 10567.89 0.19 N482 0.10 1.27 82.82 11377.01 0.20 N484 0.10 1.27 82.67 11356.36 0.20 N485 0.10 1.29 83.95 11531.16 0.21 N486 0.09 1.12 72.75 9993.66 0.18 N487 0.09 1.12 72.75 9993.49 0.18 N488 0.09 1.12 72.77 9995.19 0.18 N489 0.09 1.12 72.76 9995.07 0.18 N490 0.09 1.12 72.79 9998.49 0.18 N491 0.09 1.12 72.79 9998.4 7 0.18 N492 0.09 1.12 72.81 10001.88 0.18 N493 0.09 1.12 72.81 10001.94 0.18 N494 0.09 1.12 72.82 10002.41 0.18 N495 0.09 1.12 72.73 9990.19 0.18 N496 0.09 1.12 72.73 9990.56 0.18 N506 0.09 1.12 72.74 9991.98 0.18 N573 0.09 1.12 72.82 10002.41 0.18 N576 0.09 1.12 72.74 9992.11 0.18 b- SFWMD & Collier County Immokalee Storm Water Management Plan J-J-erv}tf 1&>69- ~. (O() (JrI3~ LOCHNER Alternative Analysis Slough - Existing Conditions L.O.S 5-yr 24-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mg/l) (mgll) (mg/l) (MPNI100ml) (mg/l) N163 0.19 2.31 46.70 4734.51 0.13 N165 0.19 2.30 46.61 4715.62 0.13 N210 0.04 0.78 8.47 6788.47 0.05 N211 0.04 0.78 8.47 6788.38 0.05 N212 0.04 0.68 12.67 3866.89 0.03 N214 0.09 1.18 13.14 854.50 0.07 N216 0.01 0.15 2.79 141.32 0.01 N217 0.04 0.81 8.75 7014.01 0.05 N218 0.10 1.66 30.87 9422.32 0.08 N244 0.07 0.88 24.18 1066.84 0.05 N256 0.11 1.44 16.04 1014.09 0.08 N270 0.01 0.20 2.25 1838.94 0.01 N337 0.08 1.09 13.33 2286.99 0.06 N517 0.04 0.81 8.75 7013.94 0.05 N686 0.19 2.31 46.71 4737.34 0.13 N709 0.01 0.15 2.79 141.28 0.01 N710 0.01 0.20 2.25 1838.81 0.01 N713 0.04 0.68 12.57 3836.34 0.03 N732 0.06 1.18 12.61 10104.08 0.07 N733 0.04 0.72 776 6219.91 0.04 N734 0.04 0.68 7.29 6358.72 0.04 N735 0.01 0.07 1.25 226.07 0.00 N736 0.04 0.56 8.10 664.41 0.03 Slough - Existing Conditions L.O.S 1 O-yr 72-h r SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mgll) (mgll) (mg/l) (MPNI100ml) (m g/l) N210 0.05 0.96 10.30 8246.81 0.06 N211 0.05 0.96 10.27 8228.03 0.06 N212 0.03 0.60 6.41 5136.92 0.04 N214 0.10 1.35 15.04 806.20 0.08 N216 0.04 0.51 5.82 348.49 0.03 N217 0.05 0.91 9.75 7804.35 0.05 N218 0.07 1.13 20.40 6643.85 0.05 hm- SFWMD & Collier County Immokalee Storm Water Management Plan ~*Xl"\ * I (Q(j1- 'l:X3. . l Q ( c{ \ ;1~~ L'odHNER Alternative Analysis Slough - Existing Conditions L.O.S 10-yr 72-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mg/l) (mg/l) (mg/l) (MPN/100ml) (mg/l) N244 0.07 0.96 10.86 683.32 0.05 N256 0.11 1.48 16.44 881.39 0.08 N270 0.01 0.28 3.05 2468.84 0.02 N337 0.08 1.14 13.04 873.08 0.06 N517 0.05 0.91 9.75 7804.33 0.05 N709 0.04 0.51 5.82 348.49 0.03 N710 0.01 0.26 2.90 2349.48 0.02 N713 0.03 0.60 6.42 5145.72 0.04 N732 0.06 1.12 12.04 9639.61 0.07 N733 0.05 0.91 9.79 7837.79 0.05 N734 0.04 0.77 8.88 7521.14 0.05 N735 0.03 0.45 5.07 303.92 0.02 N736 0.05 0.72 8.13 482.50 0.04 Slough - Existing Conditions L.O.S 25-yr 72-h r SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mg/l) (mg/l) (mgll) (MPNI100ml) (mg/l) N210 0.05 0.94 10.13 8115.64 0.06 N211 0.05 0.94 10.10 8086.50 0.06 N212 0.03 0.62 7.44 5363.80 0.04 N214 0.10 1.40 15.62 837.48 0.08 N216 0.04 0.58 6.62 399.29 0.03 N218 0.07 1.18 21.36 6936.87 0.06 N244 0.08 1.05 11.94 749.80 0.06 N256 0.11 1.54 17.16 920.19 0.09 N270 0.02 0.30 3.36 2731.58 0.02 N337 0.09 1.22 13.97 908.34 0.07 N517 0.05 0.90 9.68 7751.99 0.05 N709 0.04 0.58 6.62 399.29 0.03 N710 0.02 0.29 3.24 2636.57 0.02 N713 0.03 0.63 7.38 5368.58 0.04 N732 0.06 1.11 11.95 9567.65 0.07 N733 0.05 0.90 9.65 7730.56 0.05 N734 0.04 0.77 9.88 8476.29 0.05 N735 0.04 0.51 5.80 350.37 0.03 IAn SFWMD & Collier County Immokalee Storm Water Management Plan '~-\-==\Q ry) ~~. ( LO f3 i ^Pj , {O cJ tr (' J'3~ LOCHNER Alternative Analysis Slough - Existing Conditions L.O.S 25-yr 72-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mg/l) (mgll) (mgll) (MPN/100ml) (mg/l) N736 0.06 0.84 9.49 567.13 0.05 Slough - Existing Conditions L.O.S 100-yr 72-hr SWMM Model Max. OP04 Max. TN Max. TSS Max. E.Coli Max. NH3 Node (mgll) (mg/l) (mg/l) (MPNI100ml) (mg/l) N210 0.05 0.93 9.93 7957.06 0.06 N211 0.05 0.92 9.85 7885.43 0.06 N212 0.04 0.67 10.26 5780.28 0.04 N214 0.11 1.49 16.59 890.59 0.08 N216 0.06 0.77 8.81 533.33 0.04 N217 0.05 0.90 9.71 7773.84 0.05 N218 0.07 1.26 22.94 7378.34 0.06 N244 0.09 1.21 13.64 845.64 0.07 N256 0.12 1.60 17.82 956.72 0.09 N270 0.02 0.29 3.35 2767.26 0.02 N337 0.10 1.33 15.17 977.67 0.07 N517 0.05 0.90 9.71 7773.83 0.05 N709 0.06 0.77 8.81 533.33 0.04 N710 0.01 0.27 3.24 2682.10 0.02 N713 0.04 0.67 10.22 5790.56 0.04 N732 0.06 1.08 11.55 9246.49 0.06 N733 0.05 0.88 9.39 7519.83 0.05 N734 0.05 0.83 12.36 10829.14 0.05 N735 0.05 0.67 7.58 460.92 0.04 N736 0.08 1.04 11.77 715.85 0.06 ~ . ~ !1 -tel' , c: I\lCil S~ .,.,. 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Delaware Ave (E-W between 1 st street 6th street, and then between Delaware and Colorado along vertical 6th street) Proposed 48"0 RCP 6 Inlets (Type "0" with grate TOP) Total Length 2201 ft 2. Colorado Avenue ( 1 st street to 9th street) Proposed 48"0 RCP 7 Inlets (Type "0" with grate TOP) Total Length 2632 ft 3. Boston Avenue ( 1 st street to White Way) Proposed 48"0 RCP 9 Inlets (Type "0" with grate TOP) Total Length 3281 ft 4. 7th Street (Colorado to Boston) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 603 ft 2 Aluminum baffles 5. 4th St. (Colorado to Boston) Proposed 18" FD Exfiltration Trench 3 Inlets (Type "C" with grate TOP) Total Length 603 ft 3 Aluminum baffles 6. 9th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 7. 8th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles IBl SFWMD & Collier County Immokalee Storm Water Management Plan :r=--\-€JY\ .~ I if! B .-:+ 'ts . II U of- 135 LOCHNER Alternative Analysis 8. 7th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "c" with grate TOP) Total Length 615 ft 2 Aluminum baffles 9. 6th Ct. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 10.4th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 11.3th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "c" with grate TOP) Total Length 615 ft 2 Aluminum baffles 12.2th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "c" with grate TOP) Total Length 615 ft 2 Aluminum baffles 13. Water Quality Control Structure # 1 At 5th street south of Maple Drive: At the end of the double 48" we need a customized large control structure. 6" Bleeder @ Elev 20.00 and Weir @ Elev 23. Length of weir is equal to 20 ft. Structure dimensions equal 21ft X 10ft. 14. Lake Trafford Culvert Upgrades (Upsizing insufficient driveway culverts) · Tippins Terrace (S): 60 LF of 15" CMP with Mitered End Sections · No Name Road 'A': 60 LF of 15" CMP with Mitered End Sections · Trafford Farm Road: 60 LF of 15" CMP with Mitered End Sections · Taylor Terrace (S): 60 LF of 15" CMP with Mitered End Sections · Hall Road: 60 LF of 15" CMP with Mitered End Sections · Christian Terrace: 60 LF of 15" CMP with Mitered End Sections · Miraham Terrace (5): 55 LF of 15" CMP with Mitered End Sections · Raulerson Road (S): 55 LF of 15" CMP with Mitered End Sections · Little League Road: 90 LF of 15" CMP with Mitered End Sections 1B2 SFWMD & Collier County Immokalee Storm Water Management Plan . ~_~\-:-\e (y \--t!- l ~ B"'1- .15 . I t I o~ I~.s LOCHNER Alternative Analysis 15. Slough Cross Drain Additions: . Add 2-48 inch CMP Cross Drains (50 feet in length) to the Sanitation Road crossing . Add 2-60 inch CMP Cross Drains (50 feet in length) to the Road crossing west of Sanitation Road . Add 1-72 inch CMP Cross Drain (50 feet in length) to the second Road crossing west of Sanitation Road 16. Fish Creek Conveyance Capacity Improvements Cross Sections have been modified to relocate the top of banks 5 ft. away from the creek. This modification increases capacity and provides a more stable side-slope. Total excavation equal 1678 CY. hu- SFWMD & Collier County Immokalee Storm Water Management Plan -:L~~l ~e~ -rq ,l \1- b{- 135 LOCHNER Alternative Analysis II. Alternative #2 1. Delaware Ave ( 1 st street 6th street, between Delaware and Colorado (vertical 6th street) ) Proposed 48"0 RCP 6 Inlets (Type "0" with grate TOP) Total Length 2201 ft 2. Colorado Avenue ( 1 st street to 9th street) Proposed 48"0 RCP 7 Inlets (Type "0" with grate TOP) Total Length 2632 ft 3. Boston Avenue ( 1st street to white way) Proposed 48"0 RCP 9 Inlets (Type "0" with grate TOP) Total Length 3281 ft 4. 7th Street (Colorado to Boston) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 603 ft 2 Aluminum baffles 5. 4th St. (Colorado to Boston) Proposed 18" FD Exfiltration Trench 3 Inlets (Type "C" with grate TOP) Total Length 603 ft 3 Aluminum baffles 6. 9th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 7. 8th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 8. 7th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles ~ SFWMD & Collier County Immokalee Storm Water Management Plan 9. 6th Ct. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles ~-\em ~ I ~l.n B 1- t"'S ' Il '3 ~+ J3~ LOCHNER Alternative Analysis 10.4th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 11.3th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 12.2th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 13. Immokalee Drive (State Road 29 to Wells Street) Proposed 48"tZJ RCP 8 Inlets (Type "0" with grate TOP) Total Length 2435 ft 14. Wells Street (Immokalee Drive to dead end) Proposed 48"tZJ RCP 4 Inlets (Type "0" with grate TOP) Total Length 1350 ft 15.lmmokalee Drive (Wells to Gettys Drive) Proposed 18" FD Exfiltration Trench 6 Inlets (Type "C" with grate TOP) Total Length 1430 ft (French Drain Pipe) Total Length 60 ft (Solid Pipe) 6 Aluminum baffles 16.19th Street (I mmokalee Drive to the North) Proposed 18" FD Exfiltration Trench 3 Inlets (Type "C" with grate TOP) Total Length 900 ft (French Drain Pipe) 3 Aluminum baffles ~ SFWMD & Collier County Immokalee storm Water Management Plan +-~ 4-(iitQ6~ ::Y-\ f 11 ,I 1i:2. r- ro.--: ( < I Y .01- \ J::; '--" LOCHNER Alternative Analysis 17. Water Quality Control Structure # 1 At 5th street south of Maple Drive: At the end of the double 48" we need a customized large control structure. 6" Bleeder @ Elev 20,00 and Weir @ Elev 23. Length of weir is equal to 20 ft. Structure dimensions equal 21ft X 10 ft. 18. Water Quality Control Structure # 2 At the south dead-end of Wells Street: At the end of the double 48" we need a customized large control structure. 6" Bleeder @ Elev 22.50 and Weir @ Elev 24. Length of weir is equal to 20 ft. Structure dimensions equal 21ft X 10 ft. 19. Lake Trafford Culvert Upgrades (Upsizing insufficient driveway culverts) · Tippins Terrace (5): 60 LF of 18" (elliptical) CMP with Mitered End Sections · No Name Road 'A': 60 LF of 18" (elliptical) CMP with Mitered End Sections · Trafford Farm Road: 60 LF of 18" (elliptical) CMP with Mitered End Sections · Taylor Terrace (5): 60 LF of 18" (elliptical) CMP with Mitered End Sections · Hall Road: 60 LF of 18" (elliptical) CMP with Mitered End Sections · Christian Terrace: 60 LF of 18" (elliptical) CMP with Mitered End Sections · Miraham Terrace (5): 55 LF of 18" (elliptical) CMP with Mitered End Sections · Raulerson Road (5): 55 LF of 18" (elliptical) CMP with Mitered End Sections · Little League Road: 90 LF of 18" (elliptical) CMP with Mitered End Sections 20. Slough Cross Drain Additions: · Add 2-48 inch CMP Cross Drains (50 feet in length) to the Sanitation Road crossing · Add 2-60 inch CMP Cross Drains (50 feet in length) to the Road crossing west of Sanitation Road · Add 1-72 inch CMP Cross Drain (50 feet in length) to the second Road crossing west of Sanitation Road 21. Fish Creek Conveyance Capacity Improvements Cross Sections have been modified to relocate the top of banks 5 ft. away from the creek. This modification increases capacity and provides a more stable side-slope. Total excavation equal 1678 CY + 2193 CY (for additional 987 ft of conveyance improvements) = 3871 CY. ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~~YY\~~ ~~'::L \8 ~ l tcs ~4- /3S- LOCHNER Alternative Analysis III. Alternative #3 1. Delaware Ave ( 1 st street 6th street, between Delaware and Colorado (vertical 6th street) ) Proposed 48"0 RCP 6 Inlets (Type "0" with grate TOP) Total Length 2201 ft SFWMD & Collier County Immokalee Storm Water Management Plan ':r.-4eJy\~ { toB<f ~.I\lo c-C 1~S- LOCHNER Alternative Analysis 9. 6th Ct. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 10.4th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 11.3th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 12.2th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 13. Immokalee Drive (State Road 29 to Wells Street) Proposed 48"0 RCP 8 Inlets (Type "0" with grate TOP) Total Length 2435 ft 14. Wells Street (Immokalee Drive to dead end) Proposed 48"0 RCP 4 Inlets (Type "0" with grate TOP) Total Length 1350 ft 15.lmmokalee Drive (Wells to Gettys Drive) Proposed 18" FD Exfiltration Trench 6 Inlets (Type "C" with grate TOP) Total Length 1430 ft (French Drain Pipe) Total Length 60 ft (Solid Pipe) 6 Aluminum baffles 16.19th Street (Immokalee Drive to the North) Proposed 18" FD Exfiltration Trench 3 Inlets (Type "C" with grate TOP) Total Length 900 ft (French Drain Pipe) 3 Aluminum baffles IRS SFWMD & Collier County Immokalee Storm Water Management Plan ~\e-w it-( ~ G.~ r-rj (I \ 1-- u+ j:;S- LOCHNER Alternative Analysis 17. Water Quality Control Structure # 1 At 5th Street south of Maple Drive: At the end of the double 48" we need a customized large control structure. 6" Bleeder @ Elev 20.00 and Weir @ Elev 23. Length of weir is equal to 20 ft. Structure dimensions equal 21ft X 10 ft. 18. Water Quality Control Structure # 2 At the south dead-end of Wells Street: At the end of the double 48" we need a customized large control structure. 6" Bleeder @ Elev 22.50 and Weir @ Elev 24. Length of weir is equal to 20 ft. Structure dimensions equal 21ft X 10 ft. 19. lake Trafford Culvert Upgrades (Upsizing insufficient driveway culverts) . Tippins Terrace (S): 60 LF of 18" (elliptical) CMP with Mitered End Sections . No Name Road 'A': 60 LF of 18" (elliptical) CMP with Mitered End Sections . Trafford Farm Road: 60 LF of 18" (elliptical) CMP with Mitered End Sections . Taylor Terrace (S): 60 LF of 18" (elliptical) CMP with Mitered End Sections . Hall Road: 60 LF of 18" (elliptical) CMP with Mitered End Sections . Christian Terrace: 60 LF of 18" (elliptical) CMP with Mitered End Sections . Miraham Terrace (S): 55 LF of 18" (elliptical) CMP with Mitered End Sections . Raulerson Road (S): 55 LF of 18" (elliptical) CMP with Mitered End Sections . Little league Road: 90 LF of 18" (elliptical) CMP with Mitered End Sections 20.Slough Cross Drain Additions: . Add 2-48 inch CMP Cross Drains (50 feet in length) to the Sanitation Road crossing . Add 2-60 inch CMP Cross Drains (50 feet in length) to the Road crossing west of Sanitation Road . Add 1-72 inch CMP Cross Drain (50 feet in length) to the second Road crossing west of Sanitation Road 21. Fish Creek Conveyance Capacity Improvements . Cross Sections have been modified to relocate the top of banks 5 ft. away from the creek. This modification increases capacity and provides a more stable side-slope. Total excavation equal 1678 CY + 2193 CY (for additional 987 ft of conveyance improvements) = 3871 CY, . Proposed 5 acre lake (with a 1 acre vegetated wetland area and a 4 acre non- vegetated deeper section with a berm between them) 2788 feet up stream of Lake Trafford Road. Wetland will have a control structure (ditch block) located at the southern-most portion of the lake where the existing stream heads south to Lake Trafford Road. Where the creek discharges into/and exits out of the wetland area, limestone riprap will be placed to alleviate any erosion concerns and will provide additional treatment for ammonia. (A) 4 AC Non-Vegetated Portion of Lake: Estimated excavation quantity = 28 acre-ft (7 ft depth X 4 acres) = 45,173 CY. (B) 1 AC Vegetated Portion of Lake: Estimation excavation = 3 acre-ft (3 ft depth x 1 acre) = 4,840 CY. Proposed Weir / Spillway between the 1 AC wetland area and the 4 AC lake area. ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~-J:::~ M '=tl' ((P 8y "~ r II g ~~ I?>S LOCHNER Alternative Analysis IV. Alternative #4 1. Delaware Ave ( 1 5t street 6th street, between Delaware and Colorado (vertical 6th street) ) Proposed 48"0 RCP 6 Inlets (Type "0" with grate TOP) Total Length 2201 ft 2. Colorado Avenue ( 15t street to 9th street) Proposed 48"0 RCP 7 Inlets (Type "0" with grate TOP) Total Length 2632 ft 3. Boston Avenue ( 15t street to white way) Proposed 48"0 RCP 9 Inlets (Type "0" with grate TOP) Total Length 3281 ft 4. 7th Street (Colorado to Boston) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 603 ft 2 Aluminum baffles 5. 4th S1. (Colorado to Boston) Proposed 18" FD Exfiltration Trench 3 Inlets (Type "C" with grate TOP) Total Length 603 ft 3 Aluminum baffles 6. 9th S1. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 7. 8th S1. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 8. 7th S1. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 1B1() SFWMD & Collier County Immokalee storm Water Management Plan ~~~ lG?6+-- m.ll9 ~ \~~ LOCHNER Alternative Analysis 9. 6th Ct. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 10.4th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 11.3th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 12.2th St. (Delaware to Colorado) Proposed 18" FD Exfiltration Trench 2 Inlets (Type "C" with grate TOP) Total Length 615 ft 2 Aluminum baffles 13. Immokalee Drive (State Road 29 to Wells Street) Proposed 48"0 RCP 8 Inlets (Type "0" with grate TOP) Total Length 2435 ft 14. Wells Street (Immokalee Drive to dead end) Proposed 48"0 RCP 4 Inlets (Type "0" with grate TOP) Total Length 1350 ft 15.lmmokalee Drive (Wells to Gettys Drive) Proposed 18" FD Exfiltration Trench 6 Inlets (Type "c" with grate TOP) Total Length 1430 ft (French Drain Pipe) Total Length 60 ft (Solid Pipe) 6 Aluminum baffles 16.19th Street (Immokalee Drive to the North) Proposed 18" FD Exfiltration Trench 3 Inlets (Type "C" with grate TOP) Total Length 900 ft (French Drain Pipe) 3 Aluminum baffles ~ SFWMD & Collier County Immokalee Storm Water Management Plan ~h},-~ lto6+ '1->9 ( I do ~ 1':>> LOCHNER Alternative Analysis 17. Water Quality Control Structure # 1 · At 5th Street south of Maple Drive: At the end of the double 48" we need a customized large control structure. 6" Bleeder @ Elev 20,00 and Weir @ Elev 23. Length of weir is equal to 20 ft. Structure dimensions equal 21ft X 10ft. 18. Water Quality Control Structure # 2 At the south dead-end of Wells Street: At the end of the double 48" we need a customized large control structure, 6" Bleeder @ Elev 22,50 and Weir @ Elev 24, Length of weir is equal to 20 ft. Structure dimensions equal 21 ft X 10ft. 19. lake Trafford Culvert Upgrades (Upsizing insufficient driveway culverts) 22. Tippins Terrace (5): 60 LF of 18" (elliptical) CMP with Mitered End Sections 23. No Name Road 'A': 60 LF of 18" (elliptical) CMP with Mitered End Sections 24. Trafford Farm Road: 60 LF of 18" (elliptical) CMP with Mitered End Sections 25. Taylor Terrace (5): 60 LF of 18" (elliptical) CMP with Mitered End Sections 26. Hall Road: 60 LF of 18" (elliptical) CMP with Mitered End Sections 27.Christian Terrace: 60 LF of 18" (elliptical) CMP with Mitered End Sections 28. Miraham Terrace (5): 55 LF of 18" (elliptical) CMP with Mitered End Sections 29. Raulerson Road (5): 55 LF of 18" (elliptical) CMP with Mitered End Sections 30. Little league Road: 90 LF of 18" (elliptical) CMP with Mitered End Sections 20. Slough Cross Drain Additions: · Add 2-48 inch CMP Cross Drains (50 feet in length) to the Sanitation Road crossing · Add 2-60 inch CMP Cross Drains (50 feet in length) to the Road crossing west of Sanitation Road · Add 1-72 inch CMP Cross Drain (50 feet in length) to the second Road crossing west of Sanitation Road 21. Fish Creek Conveyance Capacity Improvements · Cross Sections have been modified to relocate the top of banks 5 ft. away from the creek. This modification increases capacity and provides a more stable side-slope. Total excavation equal 1678 CY + 2193 CY (for additional 987 ft of conveyance improvements) = 3871 CY. · Proposed 5 acre lake (with a 1 acre vegetated wetland area and a 4 acre non- vegetated deeper section with a berm between them) 2788 feet up stream of Lake Trafford Road. Wetland will have a control structure (ditch block) located at the southern-most portion of the lake where the existing stream heads south to Lake Trafford Road. Where the creek discharges into/and exits out of the wetland area, limestone riprap will be placed to alleviate any erosion concerns and will provide additional treatment for ammonia. (A) 4 AC Non-Vegetated Portion of Lake: Estimated excavation quantity = 28 acre-ft (7 ft depth X 4 acres) = 45,173 CY. (B) 1 AC Vegetated Portion of Lake: Estimation excavation = 3 acre-ft (3 ft depth x 1 acre) = 4,840 CY. Proposed Weir / Spillway between the 1 AC wetland area and the 4 AC lake area. ~ SFWMD & Collier County Immokalee storm Water Management Plan ~iFI~8:J, tx3 ' ~ L\ ~ (5~--- LOCHNER Alternative Analysis 20. 9th Street and Eustis Avenue Improvements i. Proposed 5 acre lake (with a 1 acre vegetated wetland area and a 4 acre non- vegetated deeper section with a berm between them). (A) 4 AC Non-Vegetated Portion of Lake: Estimated excavation quantity = 28 acre-ft (7 ft depth X 4 acres) = 45,173 CY. (8) 1 AC Vegetated Portion of Lake: Estimation excavation = 3 acre-ft (3 ft depth x 1 acre) = 4,840 CY. 21. Excavate Madison Avenue Ditch Dredge the ditch from Manatee to Charlotte Street 5,500ft length, to 1 ft. depth, 17100 CY of Dredging. 1Bi3 SFWMD & Collier County Immokalee Storm Water Management Plan ~~(IQB::) "t9 . (d d- o-I' ) 35- LOCHNER Alternative Analysis Appendix C: Water Quality Results Alternative # 1 Total Suspended Solids for a 5yr Storm, XP-SWMM Results (Individual Site Standards) N201. Att. 1 Existing & Future Land Use Concentration and Flow N212, Alt. 1 Existing& Future L8nd Use Concentr..lon liInd Flow 50 ---. E](istTSS - Currenl LOS Future TS5 14 " " ~ 10 8 ~ 5 .. 4 E 2 o - bistTSS - Existing LOS Future TSS ~ 40 "30 (; =&20 E 10 21 4' 61 81 21 41 61 " TIme Step (16 Minute Intervala) Time Step {is Minute Intervals) N333, All, 1 EKisting & Futur. I I Land Use Conee "tration and Flow 50 00 I BO ~ 4000 I-EXiSITSS : I ~60 ~ 3000 " , ~-~ Ex""n, LOS i D .40 ~ 20.00 ~ ~uture TSS ]' 20 E 1000 I 000 21 41 51 B1 Time Step 115 Minute Intervals) --~-~ N5S7, Alt. 1 Existing & Future land Use Concentration and Flow -ExlstTSS I; ----..-.. ExISllng LOS I I FutureTSS I 21 41 61 " Time Step 115 Minute Interval.1 Total Ortho-Phosphate for a 5yr Storm, XP-SWMM Results (,01 ppm) Alt. 1 Existing & Future Concentration and Flow N217, Alt. 1 Existing & Future Land Use Concentration and Flow ~ o 01 o ~ ~ EExlstmg 0TP04l - EXI6tll1g ~OS Future OTPQ4 I' :~ ~ 005 .. 004 ~ 003 Il ':~ , - Etistl119 OTP04 ~ Etisting LOS Future OTP04 21 4' 61 B1 " 41 5' 81 Time Step (16 Minute Intervalsl Time Step (15 Minute Intervals) N333, Alt. 1 Existing & Future und Use Concentration ~nd Flow N557, All 1 Existing & Future Land Use Concentration ~nd Flow ~ 015 " o 010 ~ toos 0.00 - Etisllng OTP04: I~'~ ''''Ii", LOS ' ::llIure 01P04 ~ ~ 0 :g. 01 E 005 . , , ' c-:- I:. 1- Etl5tmg O'TF'04 --. EXisting LOS Future OTP04 21 41 51 ., " 41 61 ., Time Step (16 Minutl!!l Intervals) Time Step (1S Minute Intervals) ~ SFWMD & Collier County Immokalee storm Water Management Plan Total Nitrogen for a 5yr Storm, XP-SWMM Results (No Standards) N207, AIL 1 Exl.ting & Future lAnd U.. Concentration and Flow 25 Future Total Nitrogen ~ 2 " 1.5 a ... 1 110 E 05 o 1 _ExistlngTotaI Nitrogen ExistIng LOS 21 41 61 81 Tlme SlIIp 115 Mlnu. In.rnlsJ N333, All. 1 Exilling & Future Land Use Concentration and Flow 2_00 FutLre Totll N1trogl!ln ~ 150 u D 1.00 ... l' 0.50 000 1 -Existing Total Nitrogen Existing LOS 21 41 6' 81 Time Sta p (15 Minute l"terv.11I N217, All, 1 Exloting & Future Land Use Concentndion and Flow 1,2 .. 1 ~ 0.8 Ci 0.6 a 0.4 E 0.2 o 1 21 41 ., ., nme Step (16 Minute In.rv.l~ NIi67, All. 1 Exlotlng & Future und Use Concentndlon and Flow 3 en 2_5 ~ 2 Q 1.5 ~ 1 E 0_5 o 1 21 41 61 81 11me Step 115 Mlnu. tn.tvala) E. Coli for a 5yr Storm, XP-SWMM Results (800 coloniesl100 mL) N207. Alt. 1 Existing & Future Land Use Concentration and Flow 35000 ~ 30000 IE 25000 g UJ 20000 1 ~ 15000 .~ 10000 f 5000 u 0 - Existing E Coli -~ Eldsting LOS Future E Coli 21 41 61 81 Time Step (16 Minute IMeI'\lAII) N333, Atl1 Existing & Future Land Us. Concentration and Flow 40000_00 30000.00 .. 20000.00 ~ " 10000,00 000 -10000.00 - ElCistlng E. Coli ElCistlnglOS Future E. Coli I Time Step (16 MlnulltlnteNl1aI ;; 20000 ... IE 15000 o i 5 10000 oi 5000 . u 10000 . 8000 ... .. 6000 8.. -~ 4000 lu 2000 . 8 0 -2000 N211, Alt. 1 Existing & Future Land Use Concentration and Flow 21 41 61 81 'J3ew.- * { to 8 1-. ~.V3,-i {~S- LodHNER Alternative Analysis -Existing Total Nitrogen - .. Existing LOS Futurl!l Total Nitrogen - ElCisting Total Nitrogen ElCI5tlng LOS Future Total Nitrogen - ElCisting E. Coli --ElCisting LOS Future E Coli -ElCisting E. Coli -- Existing LOS Future E Coli Time Step (16 Minute Inlllrvall) N557, Alt. 1 Exiotlng & Future Land Use Concemr8tion and Flow Time Step (16 Minute Interv.11) ~ SFWMD & Collier County Immokalee Storm Water Management Plan Alternative # 2 N2D7, Alt. 1 Existing & Future Land Use Concentration and Flow Total Ammonia for a 5yr Storm, XP-SWMM Results (-0.2 mg/L) N217, Alt. 1 Existing & Future Land Use Concentration and Flow 014 012 ~ 0.1 ~ 0.08 ~006 0004 E 002 o - Existing Total Ammonia ~,Ex"isting LOS Future Total Ammonia 007 ~~~ {(-DD-:J- ~. Id-\..f D~ )3~ LOCHNER Alternative Analysis - EXisting Total Ammonia - Existing LOS FutlR Total Ammonia -ExislingTotal Ammonia --- u E)(jsting LOS Future Total Ammonia' 21 81 Total Suspended Solids for a 5yr Storm, XP-SWMM Results (Individual Site Standards) 006 : 0,05 ~004 ...J 0.03 "0002 E 0.01 o 1 " 41 61 61 Time Step (16 Minute Intftnlal-l I I N557, Alt. 1 Existing & Future Land Use Concentration and Flow -ElCIStTSS .'-- El(il!iting LOS FLJtureTSS J r1~I(IStTSS m,_... ElCisting LOS Future TSB 21 41 61 " Time Step 11li Minute Intervals, N333, Aft. 1 Existing & future Land Use Concentration and Flow 008 ~006 u 0: 0,04 .... -: 0.02 0,00 - EXisting Total Ammonia Existing LOS Futur@Total Ammonia 21 41 81 81 Time Step (15 Minute Intervals) N207, Alt. 2 Existing & Future Land Use Concentration and Flow 50 - E..istTSS ~I Lm.. ~'. '''m, LOS 1 " ruturl" TSS _~i ~ 40 ~ 30 ~20 . 10 21 41 61 61 Time Step (15 Minute Interv~lsJ ~ I I N333. Att. 2 Existing & Future Land Use Concentration Ind Flow 5000 ~ 4000 ~ 3000 o ~ 2000 E 1000 r-EXiStTSS - Existing LOS FL:lure TSS 000 21 4' 61 " Time Step (is Minute Intervals) 0.14 012 ~ 0.1 ~ 008 ...I 0,06 Ii. 0_04 '002 o 41 61 Time Step 115 Minute Inlervals) N212, Alt. 2 Existing& Future Land Use Concentration and Flow ~ :~,~~I.."-.. ......'...,...,..'..........'.~.' .."'......'..,.............~..'......... -...,:.. i~:--2~,.......'~ E ~: ..' _ y,:==", < '""c_j 1 21 41 61 81 Time Step 115 Minute Intervals) N557, Alt. 2 Existing & Future Land Use Concentration and Flow 80 ~ 60 u Ci 40 .... r 20 21 41 61 " Time Swp (16 Minute Internl., 10- SFWMD & Collier County Immokalee Storm Water Management Plan -\ --te V\^--={( \ <0 b i-- ~ . I ~ rJ 13~ LOCHNER Alternative Analysis N207, All, 2 Existing & Future und U.. Conee ntratlon ..d Flow Total Ortho-Phosphate for a 5yr Storm, Xp.SWMM Results (0.01 ppm) 0.15 -ExlstingOTP04 - Existing LOS Future OlP04 N217, All. 2 Existing & Future Land Use Concentration and Flow 0.07 0,06 ~ 0.05 .. 0,04 ~ 0.03 ..002 E 0.01 o - EJC:istlng OlPo.1 -. ElfIsting LOS Fut~l! OTP04 -Existing OTP04 - Existing LOS Future OTP04 - Existing Total Nitrogen Existing LOS Future Total Nitrogen -ExistingTot81 Nitrogen - Existing LOS Future Total Nrtrogen 101 .. ~ 0.1 . ~ 0.05 E 21 41 6' 8' Time Step (16 Mlnu" Inbuvalal N333, All. 2 Existing & Future Land Use ConcentrMlon .nd Flow 02 ~ 0.15 u :s 0.1 .. t 0,05 - Existing OT'PO" -- Existing LOS Future OTP04 21 41 6' 8' TIme Step 115 Minute Intervala) 2' 41 61 6' Time S~p (11i Minute Intarval-l N567, All. 2 Existing & Future Land U.. Conce ntration IInd Flow 0.25 ~ 0.2 u 0.15 a .... 0.1 .. E005 21 41 6' 6' Time Stllp (15 Minute Intlllrvalsl Total Nitrogen for a 5yr Storm, XP-SWMM Results (No Standards) N207, All, 2 Existing & Futuro Land Use Concentration .ncI Flow 2.5 ~ 2 ~1.5 ~1 EO,S o EXisting Total Nitrogen Ellisting LOS F utl... Total Nitrogen 2' 41 51 51 Time Step (15 Minute Interv.ls) N333, All. 2 Exil1lng & Future Land Use Concentration and Flow ~ 15 u a , .. ~ 05 o 1 -ExJ5tJngTotIII Nitrogen --Existing LOS Future Total Nitrogen 2' 4' 51 6' Time Slap (t5 Minute inlilrval&J N217, All, 2 Existing & Future Land Use Concentration .nd Flow 1,2 .. ' ~ 0.8 C 06 a. 0.4 E 0.2 o 1 2' 41 51 B1 Tlme Stap (15 Mlnuta Intervals) N6li7, All, 2 Existing & Future Land Use Concentr8tlon .,d Flow 3 Cl) 25 1; 2 0: 15 i 1 E 05 o 2' 4' 5' B1 Tlme Step (1& Minute Intervals) SFWMD & Collier County Immokalee Storm Water Management Plan E. Coli for a 5yr Storm, XP.SWMM Results (800 coloniesl100 mL) N2D7, AIt. 2 Existing & Future Land Use Concentration and Flow 35000 30000 25000 ~ 20000 u 15000 10000 5000 o - Existing E Cedi ~- Existing LOS Future E Coli 21 41 51 81 Time Slap 115 Minute Inlllrvllls) N333, Alt. 2 Existing & Future l.8nd Use ConcentrBtion and Flow 40000 30000 ~ 20000 u 10000 ~ExistingE Coli Existing LOS J::utureE Coli -10000 Time Step (16 Minute Intervals) N217, Aft. 2 Existing & future LIlnd Use ConcentTlltlon Ind Flow o 20000 ~ :E 15000 ~ ~ '0000 ." g 5000 '0 u <=l-~ W\ ~ l ~ eq ~,(2~ ~f (~S- LOCHNER Alternative Analysis E:;tilitingE. CoIl ExistlnglOS Future E. COli 21 41 61 61 E)[ISling E. Coli Exisltng LOS Future E Coli TIme Step (15 Minute Interval..) N 557. All 2 Existing & Future Land Use Concentr8tion and Flow (; i o 0,", -... lu ~ 8 10000 6000 6000 4000 2000 o -2000 Time Step (15 Minute Intervals) N207, Att. 2 Existing & Future Land Use Concentration and Flow Total Ammonia for a 5yr Storm, XP-SWMM Results (-0.2 mg/L) N217, Alt. 2 ExistinG & Future Land Use Concerrtration and flow 0.14 012 ~ 01 ~ 008 ~ 0.06 m004 E 002 o o,oa ~ 0,06 " o 0,04 ~ t 0.02 -E:.:istingTotal Ammonia -- E:.:istil'lg LOS SefiesJ 007 005 : 0.05 ~004 ..J 003 m 002 E 001 o -histingTotal Ammonia - Existing LOS FutlJeTotaI AmmOl'\ia 014 012 ~ 0,1 ~008 ~005 0. 0,04 E 002 o -ExistingTotl!l1 Ammonia -- EKisting LOS Ics 21 41 61 B1 Tlme Step (16 Minute Intervalaj ~~~--, N333, Aft. 2 Existing & Future i Land Use Concentration and Flow -E:.:islmgTotal Ammonia EKisting LOS , Future Total Ammonia I 21 41 61 61 Time Step (16 Minute Intervals) 21 41 61 61 Time Step 115 Minute Interval.) NS57, Alt. 2 Existing & Future Land Use Concentr'8tlon and Flow 21 81 Future Total Ammonia " 61 Time Step (16 Minute Inmrvallj SFWMD & Collier County Immokalee Storm Water Management Plan Alternative # 3 ~-teJ<<- ~l (0 B 1-- LJdi ~~] ~ I~~ Alternative Analysis Total Suspended Solids for a 5yr Storm, XP-SWMM Results (Individual Site Standa~ds) N20T, All, 3 Existing & Future Land Use Concentration and Flow 50 ~40 "30 ;; ...20 -a. E 10 _ExI5tTSS - E)C~tlng LOS Future TSS 21 61 81 41 Time Slep (15 Minute In..rvala) N333, All. 3 Existing & Future Land Use Concentration and Flow 50 - ExislTSS .- Existing LOS FutureTSS ~40 1;30 ...20 -a. E 10 o 21 41 61 81 Time Step 116 Minute Inlarvals) N212, All, 3 Exlatlng& Future Land UN Concentration and Flow 14 12 ~ 10 ~ 8 ~ 6 -a. 4 E 2 o - Exi6tTSS Exi&ting LOS Future TSS - ExistTSS - -.- Existing LOS FutureTSS N20T, All. 3 Existing & Future LIInd Use Concentration and Flow Total Ortho-Phosphate for a 5yr Storm, XP-SWMM Results (0.01 ppm) 0.15 ., ~ 0,' ;; =a. 0.05 E - ExistOTP04 ~,Existing LOS Future OTP04 2' 41 81 81 Time Step (16 Minu.. Intervall) N333, All. 3 Existing & Future Land Use Concentration and Flow 0,2 - Existing OTPQ4 Existing LOS Future QTP04 ~ 0.15 " (; 01 ... r 005 21 41 ., 81 Time Step (Hi Nlnute In"Nalll 21 41 61 81 TIme Step (16 Mlnullt l"taNala) N65T, Nt. 3 Existing & Future Land Use Concentr81:ion and Flow 8ll -Eristing OTP04 -~. Ellisting LOS Future OTP04 - Existing OTP04 Exisltlng LOS Fl/lure OTP04 1C6 :811 " ;;40 ... }2O 21 41 61 81 Time Step 116 Minute Interval-J N217, All, 3 Existing & Future Land Use Concentnltlon and Flow 0,07 006 ~ 0,05 .004 ~ 0_03 1io 002 E 001 o 21 41 8' 81 nme Step (16 Minute Inllttvala) N557, All, 3 Existing & Future Land Use Concentration and Flaw 025 ~ 0_2 u 0,15 ;; :a. 0,1 E 005 21 41 61 81 nme Step 116 Minute In..rvala) SFWMD & Collier County Immokalee Storm Water Management Plan N207, Alt. 3 Existing & Future Land Use Concentration and Flow Total Nitrogen for a 5yr Storm, XP-SWMM Results (No Standards) N217, Alt. 3 Existing & Future u.nd Use Concentration and Flow 25 ~ 2 (J 1.5 ~ ~ ' E 05 Future Total Nitrogen 21 41 81 81 TIme Step 115 Minute Intervals) : 15 u . -' ~05 N333, AIL 3 Existing & Future :1 Land Use Conce ntration and Flow - E"""g T.t~ -hi'tingLOs ,"",,,II ::.'"J 21 41 81 81 Time Slep 116 Minute Intervals) J 12 " 1 ~ O.S ;; DB =a. 04 E 02 o 21 " 81 81 TIme Step (to Minute Intervalat N557, Alt. 3 Existing & Future Land Use Concentration and Flow 3 co 25 ::; 2 a 15 -' - 1 e 0.5 o 21 41 81 81 Time Step 115 Minute Interval.) N207, Alt. 3 Existing & Future Land Use Concentration and Flow E, Coli for a 5yr Storm, XP-SWMM Results (800 colonies/100 mL) N217, Alt. 3 Existing & Future Land Use Concentration and Flow 4000 a ," .- a a .. 'i 30000 - EXIsting E Coli -- Existing LOS L-!...~Iure E Col S 2000 1000 21 41 81 81 SteFl 115 Minute Intervals, N333, Alt. 3 Existing & Future L..::Iind Use Concentration and Flow 50000 40000 30000 " 20000 ~ " 10000 -10000 CEXlstirtg E C,ii --. EXisting LOS Future E Coli Time Step (15 Minute Interul.) 20000 ~Il ~(~bq ~ . \~<2 of- \ .?:>S LOCHNER Alternative Analysis -ElClstingTotal Nitrogen Existing LOS Future Total Nitrogen -Existing Total Nitrogen ~ Existing LOS FLJture Total Nitrogen ~ 15000 ~'oo00 u 5000 21 41 81 81 -----, i-ExlstingE Coji ~ Existing LOS FLJture E Coli Time Step 115 Minute 'ntervals) N557, All. 3 Existing & Future Land Use Concentration and Flow 10000 8000 6000 ~ 4000 u 2000 -2000 Time Step (15 Minute Intervals) w- SFWMD & Collier County Immokalee storm Water Management Plan Alternative # 4 Total Ammonia for a 5yr Storm, XP-SWMM Results (-0.2 mglL) N2D7, All, 3 Existing & Future Land Use Concentrlltlon .nd Flow 014 0.12 ~ 0.1 ~ 0.08 ~ 0.06 l004 0.02 o -Existing Total Ammonia -- Existing LOS Future Total Ammonia N217,.lIIt, 3 Existing & Futuro Land Use Concentration and Flow 0,07 0D6 f 0.05 C; 0.04 ~ 0.03 lit 0.02 E 0.01 o 1 21 41 61 81 Time Step (16 Minute Int.,...alll ~b-~labf- f=q , (2f/ uf /3S- LOC~NER Alternative Analysis - Existing Total Ammonia Exlstlng LOS Future Total Ammonia -ExlltlngTotaI AmmonIa -.-- Existing LOS Future Total Ammonia Total Suspended Solids for a 5yr Storm, XP-SWMM Results (Individual Site Standards) 21 41 61 81 Time Step (16 Mlnutlt Intervallt N333, All, 3 Existing & Futuro Land Use Concentration and Flow 0.1 Future Total Ammonia N567, All, 3 Existing & Futuro Land Use Concentration and Flow 0.14 0.12 ~ D.' ~ 0.08 ~006 1i. 0.04 E 0.02 o 1 21 41 61 B1 -ExistTSS --- Existing LOS FutureTSS B1 - ExistTSS -- Existing LOS Future TSS 81 Ics : 0.08 ~ 0.06 . ~ 0.04 E 002 o -Existing Total Ammonia --, Exisli~ LOS 21 41 61 81 Time Step 115 Minute lntervallJ N207, Att.. 4 Existing & Future lIInd Use Concentration and Flow 60 "'so ~ 40 (; 30 i. 20 E 10 o - ExistTSS ElCisting LOS Future TS S 21 41 61 81 Time Step (is Mlnumlntervallo. N3U, Alt. 3 Existing & Future lIInd Use Concentration and Flow 5000 : 40.00 o 30,00 . ...I 20,00 .. E 10.00 O.DD _ ExistTSS Existing LOS Future TSS 21 41 61 81 llme Step (16 Minute Interval_) Time Step (16 Minute Internla) N212, Alt. 3 Existlng& Future Land Use Concentration and Flow 14 12 '" ~ 10 c.> . il. E 21 41 61 Time Step (16 Minute Intervala) N567, All. 4 Existing & Future Land Use Concentration and Flow 60 '" 50 ~ 4] ;; 30 a 20 E 10 o 21 41 61 Time Step (16 Minute Interval&! SFWMD & Collier County Immokalee Storm Water Management Plan r ~ttA- .:p;-- / 0 8 ~ '~.l \~o ~ 135 LOCHNER Alternative Analysis N207, Alt. . Existing & Future Land Use Conce ntration and Flow Total Ortho-Phosphate for a 5yr Storm, XP-SWMM Results (0.01 ppm) 0.2 ~ 0.15 " o D.' -' f 005 - E~istOTP04 ! - Existing LOS Future OTPO<l' 21 41 ., 81 Time Step 11& Minute Intef"YDIa) N333, Alt. 3 Existing & Future Land Use Concentration and Flow 02 : 0.15 " o 0.1 -' rO_DS - ElCi&ting OTP04 -Ell'isting LOS Future OTP04 21 41 ., 81 ilme 5mp 115 Minute Inbe-rv.I_1 N217, All. 3 Existing & Future Land Use Concentration and Flow 007 006 ~005 ~ 0.04 ~ 0.03 ti 0.02 e 0,01 o 21 41 ., " l1me Step (16 Minute Intervals) I N557, All, . existing & Future LInd Use Concentration and Flow 0.25 : 02 ~ 015 ~ 0.1 E 0,05 o 21 41 61 " Time Step (15 Minute Inlrrva's' N2D7, Alt. 4 Existing & Future Land Use Concemratlon and Flow Total Nitrogen for a 5yr Storm, XP-SWMM Results (No Standards) 3 en 2.5 l:; 2 0: 1.5 =a. 1 E a.s o - Existinll Total Nitrogen - Existing LOS Future Total Nitrogen 21 ., 61 81 Time Step (115 Minute Intervals) N333, Alt. 3 existing & Future Land Use Cont:entr~tion and Flow : 1.5 " . 1 -' ~ as - EXisting Total Nitrogen EXiSting LOS 21 41 61 81 Time Step (16 Minute Intern Is) N217, Alt. 3 existing & Future Land Use ConcentratlDn and Flow 12 .. 1 ~ O.B o 0.6 ~ 04 E 02 o - ElCisting OTP04 - Existing LOS FLllure OTP04 -Existing OTP04 -Existing LOS FutureOTP04 -EJo:istmgTotaI Nitrogen - Existing LOS -'~"'.~ -Existing Total Nitrogen - Existing LOS Future Total Nitrogen ~ 21 41 61 81 Time Step f15 Minute Intervals) ~~7, Alt. 4 EKlstlng & Future ! Land Use ConcentratlDn and Flow 3 CI) 2.5 l:; 2 015 .t 1 IE as o 21 41 ., 81 Time Step (Hi Minute Interval&) leg- SFWMD & Collier County Immokalee Storm Water Management Plan ;; 50000 Ii 40000 ! ~ 30000 I I.> 20000 g 10000 ~ 0 3 .. '" o 0" it; g ~ 0.14 0.12 f 0.1 ~ 0.08 ~ 0.06 '00,04 E 0.02 o 0.1 ~ 0.08 1.>006 3 ' ~ 0.04 .. E002 o 1 E. Coli for a 5yr Storm, XP-SWMM Results (800 colonles/100 mL) N207. Alt. 4 Exlstll1ll & Future Land Use Concentrldlon and Flow Elilsting E Call _. Ell'latlng LOS Future E Coli 21 41 61 81 Time Step (16 Minute Intervslll N333. A1t, 3 ExlSllI1ll & Future Lind Use Concent'rMlon and Flow 50000 40000 30000 20000 10000 o .10000 - Elllsting E Coil .n Existing LOS Future E Coil Ci 20000 i 15000 8 i S 10000 1 5000 15 I.> 3 .. '" ~~ II.> g 15 I.> N217. Alt. 3 existing & Future lJtnd Use Concentration and Flow 21 41 61 S1 Time Step (16 Mlnule I"tlrv.'s) N667, A1t, 4 Exlstll1ll & Future Land Ule Concent....lon and Flow 10000 .000 8000 '000 2000 o .2000 ~1erY\*( lof:>1- 'fX:\. t3l ~+ I~ LOCHNER Alternative Analysis _ E)l'iating E. Coil - Existing LOS Future E. Coli - Existing E Coil .. -. Existing LOS Future E. Coil -Existing Total Ammonia Existing LOS Future Total Ammonia -Existing Total Ammonia l - Existing LOS I Futu," Tol.1 Ammo";. rru- Tim. Step (16 Minute Interval" 11me S.p IHi Mlnu. In.rvall) N207. All. 4 Existing & Futuro Land Use Concentration and Flow Total Ammonia for a 5yr Storm, XP-SWMM Results (-0.2 mg/L) N217, Alt. 3 ExIIlII1ll & Futuro Land Use Concentration and Flow - ExistIng Total Ammonia hitting LOS Future Total Ammonia 21 41 61 81 Time Step (16 Minute Interv.laI N333, All, 3 Existing & Future Land Use Concentration and Flow _ExilitingTotaI Ammonia - Existing LOS Future Total Ammonia 21 41 ., ., 11me SlIIp (16 Mlnull! In"rvalll 0.07 0.06 ~ 0.05 ~ 0.04 ~ 0.03 l' ~:~~ o 21 41 61 81 Time Slep 115 Minute Intltrvaltrl N567. Alt. 4 Existing & Future Land Use Concentration and Flow 0.14 0.12 ~ 0.1 ~ 0.08 ~ O.DEi D 0.04 E 0.02 o 1 21 41 ell 81 l1me Step (16 Minute Intervall) SFWMD & Collier County Immokalee Storm Water Management Plan ~1JA~l 0r3q ~ \ \~d- ~ (35' LOCHNER Alternative Analysis Appendix 0: Hydrograph Results 5 Year 24 Hour Stage - Fish Creek (N333) 281 ;;; 27 .. c 26 > ! 25 ~ CD 24 '" .l!l en 23 /' 22 12:00 12:00 12:00 12:00 12:00 PM AM PM AM PM Time (Hoursl - 5YR AL T4 - Future Land Use - 5YR AL T4 - Existing: Land Use j' 5YR Existing LOS 5 Year 24 Hour Flow - Fish Creek (N333) 90 i 80 70 -SYR ALT4 - Future I ~ 60 r Land Use SO - SYR AL T4 - Existing ~ 40 Land Use iL 30 SYR Existing LOS 20 10 O-~ --2 1200 12:00 12:00 12:00 12:00 PM AM PM AM PM Time (Hoursl 5 Year 24 Hour Stage - Slough (N217) -l 25 1 r ;;; 24 i .. ( C 23 > c( 22 L ~ .. 21 '" .l!l en 20 19 12:00 12:00 12:00 12:00 12:00 PM AM PM AM PM Time (Hours) r= 5YR ALT4 - Future Land Use -5YR ALT4 - Existing i Land Use , I 5YR Existing LOS II , i 5 Year 24 Hour Stage - 5th Street (N207) -I 29 j ;;; 28,5 '" 28. C : ~ 27'51 - 27 .. E 26.S en 26 1 2S.S I 12:00 PM ."\ \ / '" 12:00 12:00 12:00 12:00 AM PM AM PM Time (Hours) -SYRA'LT4-Future I: Land Use - 5YR AL T4 - Existing Land Use 5YR Existing LOS 5 Year 24 Hour Stage - Madison Ave (N557) 29 1 ;;; 28.5 i '" 28 i I 272~ 11 i 26,S en 26 25.5 1200 PM '1- 5YR AL T4 - Future I Land Use '- SYR AL T4 - Existing Land Use 5YR EXisting LOS f\ / 12:00 12:00 12:00 12:00 AM PM AM PM Time (Hours) 5 Year 24 Hour Flow - 5th Street (N207) 120 ] 100 , -SYR ALT4 - Future ~ 80 ~ Land Use 60. \ - SYR AL T4 - Existing ~ Land Use iL 40 SYR Existing LOS 20 ~ o -t-------------,-< 1200 12:00 12:00 12:00 12:00 PM AM PM AM PM Time (Hours) rm- SFWMD & Collier County Immokalee Storm Water Management Plan 10 Year 72 Hour Stage - Fish Creek (N333) 28 ;::; 27 ~ -10YR ALT4- Future 10 Land Use Q i 26 -10YRALT4- 25 Existing Land Use GO 24 j 10YR Existing LOS III 23 22 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) 10 Year 72 Hour Stage - Slough (N217) 25 (/ :3 24 -10YR AL T4 - Future Q Land Use i 23 -10YRALT4- 22 Existing Land Use GO 21 j 10YR Existing LOS III 20 19 , , 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) 10 Year 72 Hour Stage. 5th Street (N207) 29 _ 28.5 '\ -10YR AL T4 - Future M 10 28 Land Use Q ,\ ~ 27.5 -10YRALT4- - 27 Existing Land Use CIl ~ j 26.5 10YR Existing LOS III 26 25.5 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) '~--\q,\ ~ ~ 6q '~ \ l~~ .)-\-' /35 LO\C"~NER Alternative Analysis 10 Year 72 Hour Flow - Fish Creek (N333) 90 80 70 - 10YR AL T4 - Future i 60 ) Land Use 50 -10YRALT4- ~ 40 Existing Land Use ii: 30 10YR Existing LOS 20 10 0 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) 10 Year 72 Hour Stage. Madison Ave (N557) 32 ;::; 31 r -10YR AL T4 - Future 10 Land Use Q > 30 ! -10YRALT4- 29 Existing Land Use GO '" 28 10YR Existing LOS .llI III 27 26 , , , , 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) 10 Year 72 Hour Flow - 5th Street (N207) 140 120 100 -10YR ALT4 - Future i \ Land Use 80 -10YR ALT4- ~ 60 \ Ex isting Land Use ii: 10YR Existing LOS 40 \ 20 0 ~,..~j" ,~ 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) hn- SFWMD & Collier County Immokalee Storm Water Management Plan 25 Year 72 Hour Stage - Fish Creek (N333) ff ~~ 1 g 26 <( ~ 25-i i ~: J 12:00 AM ~ .r= 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM Time (Hours) - 25YR AL T4 - Future Land Use - 25YR ALT4- Existing Land Use : I 25YR Existing LOS II 1 i ----r=1 (') 1'\ ~ ' ,I ! ~ t2-- -4-;cJV~~ {'UfJr t3 I 3Lf 415~ LOCHNER Alternative Analysis 25 Year 72 Hour Flow - Fish Creek (N333) ~ ~ ii: 90 , 80 70 60 50 40 30 1 ~H /- 1200 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) -25YR ALT4 - Fu1urel Land Use -25YR ALT4- Existing Land Use 25YR Existing LOS 25 Year 72 Hour Stage - Slough (N217) i:1 (/ i ~~1-: CIl 20 19 , , 1200 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time {Hours} -25YR ALT4 - Fu1ure Land Use -25YR ALT4- Existing Land Use 25YR Existing L~ 25 Year 72 Hour Stage - Madison Ave (N557) ; ~~ ~ l~l~r 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) - 25YR AL T4 - Future Land Use ,-25YR ALT4- I Existing Land Use 25YR Existing LOS 25 Year 72 Hour Stage - 5th Street (N207) 29.51 ;::; 29 co 28,5 g 28 ~ 27.5 :; 27 g> 26,5 in 26 25,5 , 12:00 AM \ ~ 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM Time (Hours) 1-25YRAlT4 - Fut~ I Land Use I . - 25YR AL,T 4 - ExiS:'in,gl' ! Land Use I 25YR EXIsting L~S , -.J 25 Year 72 Hour Flow - 5th Street (N207) ~ ~ ~ o u: 1401 120 I 100 80 60 40 20 I \ --~ - 25YR AL T 4 - Future Land Use - 25YR AL T4 - Existing Land Use , 25YR Existing LOS J 1153 o ------, . 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) SFWMD & Collier County Immokalee storm Water Management Plan 100 Year 72 Hour Stage - Fish Creek (N333) 28 c:> 27 J -1ooYR AL T4- CD Future Land Use Q i 26 -100YRALT4- 25 Existing Land Use CD 24 '" 100YR Exls1lng LOS J!l lil 23 r 22 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) 100 Year 72 Hour Stage - Slough (N217) 25 ( c:> 24 -100YRALT4- CD Future Land Use Q i 23 -100YR AL T4 - 22 Existing Land Use CD 21 l:ll 100YR Existing LOS J!l lil 20 I 19 , , , , 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) 100 Year72 Hour Stage - 5th Street (N207) 29.5 ;:;- 29 '\ -100YRALT4 - Future co 28.5 Land Use Q > 28 <( -100YR AL T4- I ~ 27.5 ~ Existing Land Use Cll 27 ~ 26.5 100YR Existing LOS U; 26 25.5 12:00 12:00 12:00 12:00 12:00 12:00 f>M f>M AM AM f>M AM Time (Hours) ~~l\a~::t- ~ ' l ~S- 1>+ {3,~ LOC~HNER Alternative Analysis 100 Year 72 Hour Flow - Fish Creek (N333) 90 80 70 ~-~ -10oYR ALT4- I 60 Future Land Use 50 -100YR ALT4- ~ 40 Existing Land Use iL 30 100YR Existing 20 LOS 10 0 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM TIme (Hours) 100 Year 72 Hour Stage - Madison PNe (N557) 32 c:> 31 r -100YR AL T4 - CD Q Future Land Use > 30 ~ - 100YR AL T4- 29 Existing Land Use CD i 28 100YR Existing LOS 27 26 , 12:00 12:00 12:00 12:00 12:00 12:00 AM AM AM AM AM AM Time (Hours) 100 Year 72 Hour Flow - 5th Street (N207) 140 120 -100YR ALT4 - Future ~ 100 ~ Land Use ~ 80 -100YR ALT4- ~ Existing Land Use 0 60 ~ u: I \ 100YR Existing LOS 40 20 ~ o +-----< -<" , 12:00 12:00 12:00 12:0012:00 12:00 AM AM AM AM AM AM TIme (Hours) ~