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Agenda 06/09/2015 Item #11A 6/9/2015 11 .A. EXECUTIVE SUMMARY Recommendation to adopt a resolution authorizing the condemnation of those perpetual and temporary easement interests necessary for the construction of stormwater improvements known as the Wing South segment of the Lely Area Stormwater Improvement Project. (Project No. 51101.) Estimated fiscal impact: $1,715,000. OBJECTIVE: To authorize the condemnation of easements necessary for the construction of the Wing South segment of the Lely Area Stormwater Improvement Project. (LASIP.) CONSIDERATIONS: The Board of County Commissioners (Board) has stated its concern over the extreme flooding issues during the rainy season in the East Naples area. Design, permitting and construction of the many phases of LASIP have been ongoing for more than 20 years. During this period, a significant amount of time and effort has been spent on the analysis of dozens of considerations resulting in LASIP's final alignment. This alignment is based on the natural overland flow of stormwater working in concert with existing wetlands as well as existing ditches and canals constructed many years ago. The major portion of this final alignment is in the same location as the existing ditches and canals. LASIP will deepen and widen these existing facilities, provide new facilities, and provide the ability to drain the abundant stormwater we receive in the rainy season and retain the limited stormwater that falls in the dry season. The natural direction of sheet flow in the LASIP area is in a generally southwest direction toward the coastal zone and the headwaters of Sandhill and Rookery Bays. Nearly all of the existing conveyance ditches and public canals previously constructed within the LASIP area since the 1950's have been "designed" to convey water to the south and to the west. Twenty years of analysis has revealed that the most viable approach to construct stormwater improvements within the area is to follow these existing conveyance alignments. Since the entire LASIP area is virtually at"build-out," any alternative alignment would have serious negative and costly real estate impacts. The only practical method for increasing stormwater discharge and alleviating flooding is to improve the capacity of the existing ditches and canals. The attached map shows the approximate location of the Wing South easement acquisition area. Three new weirs will be constructed along with open channel and closed channel flow systems. Additionally, existing ditches and canals will be improved in order to alleviate flooding during typical rainfall conditions, and maintenance pathways will be constructed adjacent thereto, where required. Construction will commence at the end of this year. A technical memorandum is attached from Daniel W. Brundage, P.E. of Agnoli, Barber & Brundage, the consulting engineering firm designing and permitting this segment of LASIP. By its review, concurrence and approval of this Executive Summary, the back-up documentation, and the proposed resolution, the Board will have determined that the legal descriptions, and the interest in real property specified on each legal description attached to the resolution,represent the most feasible location, and are necessary for the construction of this phase of the LASIP project. In addition to the direct cost of all easements required for construction, the County is also required to pay severance damages to remaining properties caused as a result of the part taken to construct the project, all expenses for title work, real estate appraisals, and those expenses related to condemnation when necessary, such as property owner attorney fees and expert witness fees, according to Sections 73.091 and 73.092, F.S. To the extent settlements are achieved in lieu of litigation, these costs may be reduced significantly. Packet Page-216- 6/9/2015 11 .A. FISCAL IMPACT: The fiscal impact associated with this item is estimated to be $1,715,000. Source of funds is a transfer from the General Fund. Incremental maintenance costs for this segment of LASIP post-construction are estimated at $8,930 per year for mowing, garbage removal and other minor "as needed" maintenance of the area such as periodic inspections of drainage structures and cleaning. The life cycle costs for the three weirs will total between $75,000 and $150,000 for approximately 35 years of maintenance. LEGAL CONSIDERATIONS: This item has been reviewed as to form and legality, and requires a majority vote for Board approval. -JAB GROWTH MANAGEMENT IMPACT: This recommendation is consistent with the County's Growth Management Plan. RECOMMENDATION: That the Board of County Commissioners of Collier County: 1. Adopt the attached Resolution; 2. Authorize its Chairman to execute same on behalf of the Board; and 3. Authorize any budget amendments that may be necessary to implement the collective will of the Board as evidenced by the adoption of the attached Resolution and the approval of this Executive Summary. Prepared By: Robert Bosch, Asst.Manager, ROW Acquisitions, Transportation Engineering Division, Growth Management Department.. Attachments: 1) Resolution with Exhibit"A"; 2) Location Map; 3) Technical Memorandum from Daniel W. Brundage, P.E.; 4) Conceptual Permit Application, dated September 2001; and 5) Appraisal reports, due to their size accessible at: http://www.colliergov.net/ftp/Agendalune920I 5/GrowthMBmlt/Appraisals- Wing South.pdf. Packet Page-217- 6/9/2015 11 .A. COLLIER COUNTY Board of County Commissioners Item Number: 11.A. Item Summary: Recommendation to adopt a resolution authorizing the condemnation of those perpetual and temporary easement interests necessary for the construction of stormwater improvements known as the Wing South segment of the Lely Area Stormwater Improvement Project. (Project No. 51101.) Estimated fiscal impact: $1,300,000. (Jay Ahmad, Transportation Engineering Director) Meeting Date: 6/9/2015 Prepared By Name: robertbosch Title: Operations Analyst, Senior, Growth Management Department Approved By Name: taylor_1 Title: Management/Budget Analyst,Growth Management Department Date: 05/12/2015 10:43:31 AM Name: cox_s Title: Project Manager, Senior, Growth Management Department Date: 05/12/2015 02:09:17 PM Name: AllisonKearns Title: Manager Financial &Operational Support, Growth Management Department Date: 05/14/2015 09:41:17 AM Name: JayAhmad Title: Division Director-Transportation Eng, Growth Management Department Date: 05/14/2015 10:14:35 AM Name: geneshue Title: Division Director-Operations Support, Growth Management Department Date: 05/14/2015 10:20:59 AM Name: hendricks_k Title: Manager-Right of Way,Growth Management Department Date: 05/18/2015 11:54:20 AM Packet Page-218- 6/9/2015 11 .A. Name: kurtz_g Title: Project Manager,Principal, Growth Management Department Date: 05/18/2015 12:32:01 PM Name: gossard_t Title: Division Director-Road Maintenance, Growth Management Department Date: 05/18/2015 12:58:33 PM Name:jenniferbelpedio Title: Assistant County Attorney, CAO General Services Date: 05/19/2015 08:31:05 AM Name:NickCasalanguida Title:Deputy County Manager, County Managers Office Date: 05/20/2015 08:58:07 AM Name: klatzkowjeff Title: County Attorney, Date: 05/20/2015 10:54:47 AM Name: markisackson Title: Division Director-Corp Fin&Mgmt Svc, Office of Management&Budget Date: 05/20/2015 11:24:51 AM Name: NickCasalanguida Title: Deputy County Manager, County Managers Office Date: 05/22/2015 05:11:19 PM Packet Page -219- 6/9/2015 11 .A. RESOLUTION NO. 2015- A RESOLUTION AUTHORIZING THE CONDEMNATION OF THOSE PERPETUAL AND TEMPORARY EASEMENT INTERESTS NECESSARY FOR THE CONSTRUCTION OF STORMWATER IMPROVEMENTS KNOWN AS THE WING SOUTH SEGMENT OF THE LELY AREA STORMWATER IMPROVEMENT PROJECT. (PROJECT NO. 51101). WHEREAS, the Board of County Commissioners desires to improve the treatment and control of stormwater in the East Naples Area in order to alleviate flooding; and WHEREAS, the Lely Area Stormwater Improvement Project consists of improvements to an existing drainage system for an approximately 11,100 acre area located in East Naples, of which Wing South is one phase(hereinafter referred to as the"Project"); and WHEREAS, the Project includes the construction of maintenance pathways and open and closed channel flow systems, and the expansion of existing flow systems in order to improve the conveyance and capacity of the flow way; and WHEREAS, the Lely Area Stormwater Improvement Project is in accordance with both the Capital Improvement Element and Drainage Sub-element of the Growth Management Plan; and WHEREAS, the location for the construction of the proposed improvements has been fixed by survey and is collectively represented by the legal descriptions comprising Exhibit "A" attached hereto and incorporated herein; and WHEREAS, after consideration of the availability of alternate routes and locations, the comparative costs of Project alternatives, various impacts upon the environment, long range planning options, and public safety considerations, the Board desires to exercise its right to condemn the property for public purposes. NOW, THEREFORE, BE IT RESOLVED BY THE BOARD OF COUNTY COMMISSIONERS OF COLLIER COUNTY, FLORIDA, that it has been determined by the Board that it is necessary and in the public's best interest to acquire the property described in Packet Page -220- 6/9/2015 11 .A. Exhibit "A" (the "Property") for the purpose of constructing the improvements proposed as part of the Wing South segment of the Lely Area Stormwater Improvement Project located in East Naples, and for providing access to the improvements, in order to protect the health, safety and welfare of the citizens of Collier County. AND IT IS FURTHER RESOLVED that acquisition of the Property and construction upon the Property is part of the County's long range planning effort to alleviate flooding in the East Naples area. AND IT IS FURTHER RESOLVED that the Board has reviewed the staff report and considered the presentation concerning alternative locations for the Project, various impacts to the environment, public safety and welfare considerations associated with the design and construction of the Project, and the costs associated with the design, property rights acquisition, and construction of the Project; and the Board finds that after consideration of these issues, the most feasible location for construction of the proposed improvements is collectively represented by the legal descriptions comprising Exhibit"A" attached hereto and incorporated herein. AND IT IS FURTHER RESOLVED that the perpetual, non-exclusive drainage, access and maintenance easements include the right to place and/or excavate materials for the purpose of constructing, operating, and maintaining drainage structures and facilities, including but not limited to canals, ditches, swales, earthen berms, rip-rap and retaining wall systems, underground pipes, weirs, and various types of water control structures within the easement areas. These easements also include the right to remove and use any and all excavated material and to construct and maintain a stabilized roadbed facility capable of providing access for vehicles and equipment for perpetual maintenance of drainage facilities thereon and adjacent thereto. AND IT IS FURTHER RESOLVED that the perpetual, non-exclusive drainage easements include the right to place and/or excavate materials for the purpose of constructing, operating, and Condemnation Resolution Packet Page-221- 6/9/2015 11 .A. maintaining drainage structures and facilities, including but not limited to canals, ditches, swales, earthen berms, rip-rap and retaining wall systems, underground pipes, weirs, and various types of water control structures within the easement areas. These easements also include the right to remove and use any and all excavated material and the right to perpetual maintenance of drainage facilities thereon and adjacent thereto. AND IT IS FURTHER RESOLVED that the temporary construction easements include the temporary right-of-entry on to private property in order to construct drainage structures and facilities within the permanent drainage easements and the public right-of-way adjacent thereto; to store and marshal equipment and materials during construction of the Project, and to demolish or clear any structures, improvements or other features required to be removed in order to construct the Project, with full authority to enter thereon and to grade, regrade and excavate as necessary for the construction of the Project and for restoring the temporary construction easement area. Throughout the duration, the County has the right and authority to remove and dispose of dirt, rocks and vegetation within the temporary construction easement area. AND IT IS FURTHER RESOLVED that foresaid easement interests, more fully described in Exhibit "A" attached hereto and incorporated herein, are necessary for the construction of the Project. AND IT IS FURTHER RESOLVED that all of the Property shall be put to public purposes. AND IT IS FURTHER RESOLVED that the County Manager or his designee and the Office of the County Attorney are hereby authorized and directed to immediately acquire by gift, purchase or condemnation, in accordance with the provisions of Chapters 73, 74 and 127, Florida Statutes, the real property interests more particularly described in Exhibit "A", attached hereto and incorporated herein. Condemnation Resolution Packet Page-222- 6/9/2015 11 .A. AND IT IS FURTHER RESOLVED that the County Manager or his designee are hereby authorized and directed to make purchase offers to property owners for the land and easements required to construct the Project, which offers shall be based upon estimates of the market value of the subject real estate (real estate appraisals) which have been developed by licensed state-certified general real estate appraisers. AND IT IS FURTHER RESOLVED that no mobile homes are located on the Property and therefore it will not be necessary to remove any mobile homes from the Property to be acquired. This Resolution, adopted on this day of , 2015, after motion, second and majority vote. ATTEST: BOARD OF COUNTY COMMISSIONERS DWIGHT E. BROCK, Clerk OF COLLIER COUNTY,FLORIDA By: Tim Nance, Chairman Approved as to form and legality: 'z-Eaa.vtit Assistant County Attorney � b k\% Condemnation Resolution Packet Page-223- I EXHIBIT"A" 6/9/2015 11 .A. Page 1 of 17 r N. S 0, 7 < Z _c a CD a m a.0 cc 0 o 1... 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Subject: Condemnation Resolution for LASIP Naples Manor Outfalls 3 &4 Improvements The Board of County Commissioners will be considering the adoption of a Condemnation Resolution for the property interests necessary to construct the Wingsouth Airpark portion of the Lely Area Stormwater Improvement Project(LASIP). This memorandum contains vital information that the Board of County Commissioners must consider in adopting this resolution. The LASIP system, as a whole, will provide a comprehensive stormwater outfall system for an area of East Naples formerly known as Water Management District#6,which has for years experienced an increasing level of drainage related problems as growth has continued in the area. The drainage area of LASIP consists of about 11,135 acres and consists of two sub-basins known as the Lely Canal Basin (LCB) system and the Lely Manor Basin (LMB) system. The Lely Canal Basin discharges into an estuarine coastal zone along the intercoastal waterway near Dollar Bay. The Lely Manor Canal discharges into an estuarine coastal zone near the headwaters of Sandhill Bay and eventually into Rookery Bay Continued development of the area has impacted flood levels as well as water quality due to the lack of a comprehensive drainage outfall system in the LASIP area. Available data indicates that K:',7000`..759Q 7WS LASIP Winesouth Airpark Correspondences Memo`:L.ASIP Wingsouth Technical Menlo;-16- 15.'MENI.doc Packet Page-242- 6/9/2015 11 .A. water quality is generally good at present but could be expected to deteriorate unless an improved water management outfall system for the area described as follows is developed. A. Lely Canal Basin The existing Lely"Main" Canal flows from Rattlesnake Hammock Road south then west and parallel to Rattlesnake Hammock Road, then south again and through the bridges at U.S. 41 and south until it discharges into an estuarine coastal zone along the intercoastal waterway near Dollar Bay. The LASIP Lely Main Canal Extension improvements consist of the portion of the Lely Main Canal system located south of and parallel to Rattlesnake Hammock Road between a point approximately 1/4 mile east of County Barn Road, thence south for approximately 344 feet, and thence westerly approximately 1 mile to the southern bend of the Main canal. The flow capacity of the canal and structures in the Main upstream of the U.S. 41 bridges have been increased. At the downstream discharge of the Main canal, a spreader lake with a control berm elevation of 2.5 NGVD has been constructed to eliminate current over drainage, salt water intrusion, and provide a broader distribution of fresh water instead of the existing concentrated point discharge. South of Rattlesnake Hammock Road a weir has been constructed at Doral Circle to raise the normal stage elevation to 4.0 to eliminate current over drainage. The LASIP overall plan has extended the Lely Main Canal system upstream using the stormwater management system of the Royal Wood Development. A network of smaller canals, weirs and swales has been constructed to provide appropriate flood relief without over draining existing wetlands. One new canal system has been extended north from the northeast corner of Royal Wood to serve the northeast portion of the Lely Canal Basin area. The canal was extended from Royal Wood upstream to the southern edge of a wetland area near Cope Lane. Three weirs were constructed in this canal to maintain water levels in the wetland areas and to cause flows to continue to pass through a historic slough lying in a northeast to southwest direction across Cope Lane, Country Road, and Whitaker Road to provide lateral distribution of excess flow into the K:`:7000 7$99 %WS I_.ASIP W'ingsouth Airpark!Correspondences`.Memo ALASIP 4t ingsouth Technical Memo 3-16- 15.MFTvI.doc 2 Packet Page-243- 6/9/2015 11 .A. proposed canal. Water levels in these swales are maintained by the downstream weir control elevations. The weir structures have gates that allow lowering water levels if needed after, or in preparation for, a major storm event. Also, an east to west canal is proposed to will collect part of the drainage from the area along Sandy Lane. It will also provide a cross-basin connection that will normally be closed, but in special emergency situations can be opened to allow interconnection of the Lely Canal Basin and the Lely Manor Basin systems. A culvert and canal system has been extend from the northwest corner of Royal Wood up to Whitaker road. It provides added capacity for flood relief for the downstream end of the slough and for the area between Royal Wood and Whitaker. A tributary called the "Branch"joins the Lely Main Canal a short distance upstream of the U.S. 41 Bridge and east of the intersection of U.S. 41 and Rattlesnake Hammock Road. The Branch provides drainage for the developed area along the Florida Power and Light Corporation right- of-way north of Rattlesnake Hammock Road,the areas surrounding Loch Louise and Crowne Point developments located south of Davis Boulevard, and the developments along the north side of Davis Boulevard. The capacity of the Branch downstream of Loch Louise has been increased by construction of a larger canal cross section, the Loch Louise weir has been reconstructed, a new weir has been constructed at the northern end of the existing triple box culverts under Davis Boulevard, and the collection system along the north side of Davis Boulevard has been extended to its full planned length east of Santa Barbara Boulevard. Construction of a weir structure has been completed at the intersection of the Branch system with the Haldeman Creek Basin system. Elsewhere in the Lely Main Canal system, LASIP drainage improvements associated with two road projects, Rattlesnake Hammock Road, and Santa Barbara Boulevard Extension, have been constructed. The County Barn Road portion of the LASIP system including a new weir and ditch improvements along the roadway's east side are currently under construction. The majority of wetland impacts associated with the Lely Main Canal portion of the LASIP project are related to modifications involving excavating existing canals. However,there are K:°.7000`,7599-'WS LASIP Win south Airpark Correspondences;Memo`:LASIP Wingsouth Technical Memo 3-16- 1 5.11E :l.doc 3 Packet Page -244- 6/9/2015 11 .A. some areas where new canal and swale construction will create new wetland impacts, although extensive efforts have been made to avoid or minimize these impact areas. The capacity of the Main Canal downstream of U.S. 41 has been increased by excavation to a larger cross section and the construction of an outlet spreader lake that conducts flow into existing wetlands immediately to the south,west, and east of the canal. Wetlands were impacted by this construction but impacts were offset by the improved flow conditions into the existing receiving estuarine wetland area. B. Lely Manor Basin The Lely Manor"Main" Canal collects stormwater from within the Naples Manor subdivision, developments to the north, and from the drainage area to the northeast of Naples Manor subdivision. Storm water then flows west to the U.S. 41 culvert which discharges into a wide canal oriented east to west eventually discharging into a large fresh water marsh. The lower Main begins south of the marsh and discharges into an estuarine coastal zone near the headwaters of Sandhill Bay and eventually into Rookery Bay. A number of smaller canals provide internal drainage for the Naples Manor subdivision and discharge into the U.S. 41 road ditch. Stormwater in the road ditch flows through three additional culverts and to the south and then to the west to the lower main canal. Construction of the proposed plan downstream of U.S. 41 has increased the capacity of the main canal to provide flood relief for upstream areas. Additionally, a weir and a spreader lake was constructed to prevent over drainage of a large wetland marsh while eliminating the problem of a freshwater point discharge. Construction of a new north/south canal system roughly along the east side of Sections 30 and 31 of Township 50 South Range 26 East has taken place. The existing canals that currently divide a historic slough/flowway have been abandoned by development plans of the land owner, a pump station has been installed to re-hydrate the slough, K:°7000'.7599-7WS L.ASIP Wingsouth Airpark Correspondences Memo yL?SIP Wingsouth Technical Memo 3-16- 1 5.MEM.tloc 4 Packet Page-245- 6/9/2015 11 .A. capacity improvements have been made to the existing canals extending from U.S. 41, and a new discharge point has been created by constructing a spreader lake adjacent to another wetland flowway system that has been cut off from historic sheet flow for many years. Capacity improvements Upstream of U.S. 41 have been made to the north perimeter canal of Naples Manor, including construction of a weir at Warren Street to reduce current over drainage impacts to adjacent wetlands. Construction of capacity improvements have also been made to the canal along the north side of U.S. 41 that allow for lateral distribution of stormwater to all the culverts crossing beneath U.S. 41. For safety and capacity reasons, one existing channel within the Naples Manor subdivision has been enclosed in a pipe. Upstream of the Naples Manor subdivision,the southern end of the existing Rattlesnake Hammock slough has been bermed and a discharge weir constructed to prevent current over drainage into the north perimeter ditch of the Naples Manor subdivision. North of Rattlesnake Hammock Road the existing piecemeal system of ditches will be modified to create a manageable stormwater system. Strategically located culverts, weirs, and channel improvements will direct stormwater flow into the northern remnants of the Rattlesnake Hammock slough. Weirs are located with control elevations to provide flood protection while keeping the adjacent wetlands as wet as possible. A major component of this reconstruction involves connecting the existing perimeter canals around the Wingsouth Airpark into the Lely Manor Basin canal system. The areas of wetland impact are at and near the proposed discharge spreader lakes, the wide main canal south of U.S. 41 and the lower main canal, the proposed new Region 5 East outfall canal, areas near the County's South County Water Reclamation Facility, and areas around the Wing South Airpark. The impacts are minimized by installation of weirs to maintain water levels and to promote replenishment of existing wetland areas in the lower and upper parts of this basin. A weir is proposed north of the Wingsouth Airpark to maintain water levels in the extensive wetland preserve areas of developments to the north. The majority of wetland impacts lc:;7000;7599-7WS LASIP Wingsouth Airpark lCorrespondences'_Memo y;LASiP\Vingsouth Technical Memo;-16- 15.MEM.doc 5 Packet Page-246- 6/9/2015 11 .A. associated with the Lely Manor Basin portion of the LASIP project are related to modifications involving excavating existing canals. However, there are some areas where new canal and spreader lake construction will create new wetland impacts, although extensive effort was made to avoid or minimize these impact areas. C. LASIP Wingsouth Airpark Improvements Easement Requirements Easements are required across the parcels indicated on the exhibits for the purpose of construction of the Wingsouth Airpark facilities as well as access for maintenance of the outfall systems when constructed and in operation. The following is a location map of the Wingsouth Airpark area. k',. II �;� '� l „f ,• rd"., ° '' `wm r T- ✓f F �xK''''',,'"'''''l� .S following r* �., m �€ r1'�i..A.1r ,r,,yz t ;r v t ,, � _ e '�'�„,, t- 3* ^a-. �`F'4! '* It'1_5:41- 'gi1 , gs ju a + e' S a, 9iz ''4.'44t,_,,'", C "Y tg_rx of-t >s , ,,; 4 r '0.+ "s "s t 82 ';-,, ` r tr 4,^F ^a s �� 1s ay �r + :7,—,..,,,,:x.,-\,$,,e'„p; i°'"`,y5 g� � � r£ •j.�»4a�,�.. kii'�c'� 'E,r#hr# w !h' Ti 'Y k ; + k a' Nve ” if'��,.�'Iz? , p u,,k n -, +'—''`4 r- ., 4 k' A 3'i.1t F`a, a' , y r �1 4 'F •re ! s t� .�rl i ,t.! ,r , °j�' � 1,1 aY '„ 'a ,� c 9,'d":, #,7� y„ pp� rp 1,I sh [._. .�qy, II +,--- .5� p, : r.. ''- 2 L, r� ' TS ;w " `-,,,: ,aye 1? 1,„2-.,-,...:„, .. , d ..1i ,..11„ z '"..„ ' -, ��K x4G S hy'•,* ;U��" ;t- x' P I '''''41- d at r- . *: d r: u ��# ,�'. M �j', d""� � 4 '� zry`v.. ",a e z' 'sk y r sue,. .Y ; r —io6 49.4 a.,:.e� , ]".. .' �� i ms oo rim oo'. +t6 aop ,- .00 Ti570o i '3o w , o-. 02 ''''1"7.7 sr w "`t ', .,,yT ?�- .� :- �` .sKi� g�ti � *,&2.. q�' f ' fl c i°x w �T 4 y i .,...fl" ,t} i fn zi.'::*:N4**!-r. - '' ,;:i''^,' . ''' 4.4,,::-.! ,, I -. voNGsou TN A:wF ARK J- ��- i 3 00 155« :i60 0 "",#ti,, PP'''''CT trap o+�r a oc sr ► W ,. — r a 200 00j d ;205.0' „r!," 210 00 '7-2,1549° 220+00 225*t .230*00 23500 240 00 245 00 . 250+00 ! .'fk M�:K l�l a cacao f''' i t qe - . rye f i A Staff has considered the following factors before recommending that these easements must be acquired, and this memo serves to summarize them for the Board's benefit. K:';7000 7-99-7\A'S LASIP "in�so>all :Airpark;Correspondences'_Memo`,LASIP Wingsouth Technical Memo 3-16- 15.MEN I.doe 6 Packet Page-247- 6/9/2015 11 .A. 1. Alternate Routes Alternate alignments and configurations of the LASIP proposed improvements were exhaustively analyzed during the conceptual design and permitting process for the LASIP system. A detailed alternatives analysis was prepared for the permitting agencies and is presented in a document entitled "Conceptual Permit Application-Lely Area Stormwater Improvement Project-Lely Canal and Lely Manor Basins" dated September 2001. Throughout the permitting process each alternative configuration was reviewed and debated to determined which design was the one that provided the most public benefit with the least environmental and economic impacts. Before the Wingsouth Airpark was constructed, stormwater flowed overland as sheet flow, slowly draining the area and hydrating the wetlands. Construction of the Wingsouth Airpark and development of surrounding communities has altered the overland sheet flow and existing drainage significantly. Canals and other drainage conveyances were constructed which quickly conveyed stormwater and limited flooding in the developments. This rerouting of the sheet flow limited the amount of water available to hydrate the existing wetlands surrounding the Airpark on the north, east, and west, adversely affecting them. The existing wetlands need seasonal rehydration in order to thrive. To mitigate wetland over-drainage, the LASIP conceptual plan called for construction of several weirs in the vicinity of the Airpark to force water to flow overland through the surrounding cypress wetlands. The water would then flow into existing and proposed channels and culverts around the Wingsouth development and then eventually into the Rattlesnake Hammock Slough and Roadway drainage system. The easterly portion of the Wingsouth Airpark project calls for improvements to the existing canal along the easterly boundary which is the most practical location for the K:'7000:7599-7WS LASIP WinLsouth Airpark Correspondences Memo L.,ASIP Winasouth Technical Memo -16- 15.MEM.doc 7 Packet Page-248- 6/9/2015 11 .A. improvements resulting in the lowest cost and fewest environmental impacts. The easement requirements along the easterly boundary of the Airpark were straight forward due to the small amount of wetlands located along the alignment of the existing canal. Water flowing over proposed weir C4C-O1-SO11O, located at the north end of the Airpark runway, would flow through the existing channel C4C-01-COOS and then over weir C4C- 01-50100 into the Rattlesnake Hammock Road drainage system. The proposed easements along the easterly boundary are sized to be just wide enough to accommodate the required canal widening and the proposed maintenance pathway. The existing canal lies primarily within Wingsouth. A spoil berm from the original construction of the canal lies primarily within the Naples Lakes Country Club adjoining Wingsouth on the east. Because of this existing configuration the proposed canal improvements are designed to take place within Wingsouth to take advantage of the existing excavation, and the proposed maintenance pathway is designed to take place in the Naples Lakes Country Club to take advantage of the existing berm. The proposed canal improvements in this area will be approximately 5,290 feet in length and will run from Station 200+75.20 to Station 253+64.07. The pathway along the east side will be constructed at an elevation of 10.00 NGVD along the existing spoil berm. The total width of the proposed drainage easement along the easterly portion of the project is 65 feet. The portion of the easement width encumbering Wingsouth is 45 feet while the portion of the width encumbering Naples Lakes Country Club is 20 feet. The proposed drainage easement will accommodate an approximate 46 foot wide canal, a 12 foot maintenance travel way on the east, and space for side slopes and plantings. The design of westerly improvements is more of a challenge due to 1)the close proximity of Wingsouth dwelling units that have been built very close to the westerly property line, 2)private improvements that have been constructed within the slough located west of Wingsouth, and 3)the large amount of wetlands located west of the Wingsouth westerly K: 7000 7599-7WS ASIP Wingsouth Airpark`:Correspondences`;Memo I, SIP Wingsouth Technical Memo ;-16- 15.MEM.doc 8 Packet Page-249- 6/9/2015 11 .A. property line. Water flowing over weir C4C-01-S0110 would also flow along the west side of Wingsouth into proposed channels C4C-02-C0035, C0045, and C0055, for outfall into the Rattlesnake Hammock Slough and Roadway drainage system. Proposed weir C4C-02-S0100 (originally located at Station 113+50+/-)had to be relocated further south to Parkers Hammock Road (Station 109+85+-) due to the potential to flood newly constructed improvements. This design modification will conduct a portion of the flow along the Parkers Hammock Road rather than through the slough located north of the Parkers Hammock community. The flow along Parkers Hammock Road will discharge into the slough located at its western terminus. Of the various options considered, relocation of weir C4C-02-S0100 will prevent flooding of the recent improvements in the area while still providing for its wetland rehydration. Moving weir C4C-02-S0100 to the south will necessitate a wider conveyance to carry the flow further south to the new location; however,the proposed canal extension cannot be made wide enough because of the close proximity to an existing house. Therefore construction of 463 +/- feet of 54-inch storm culvert is required to adequately conduct the flow. The C4C-02-S0100 weir will function as a diversion structure by directing most of the stormwater to flow to the west through a proposed 1300+/- feet of 48-inch storm culvert along Parkers Hammock Road to the existing wetland slough at the roadway's western terminus where it will outfall into the Rattlesnake Hammock Road system. Excess stormwater that flows over the weir will flow to the south through 945 +/- feet of 24-inch storm culvert to the Rattlesnake Hammock Road drainage system. Starting at Rattlesnake Hammock Road and heading north the proposed drainage easement configuration is as follows. a. An existing 20 foot drainage easement located within Shadow Wood Villas and Shadow Wood Park from Station 100+50+/-to Station 109+95+/-will be K:`;7000\7599-7W'S LASIP Win/south _airpark;Correspondences:Memo 1,.SIP L1%ingsouth Technical Memo 3-16- I5.MENI doc 9 Packet Page-250- 6/9/2015 11 .A. utilized to construct the 24" culvert. Construction will include a shallow swale over the pipe to collect local drainage. A 10 foot wide Temporary Construction Easement(TCE)will be required along the east side of the Parkers Hammock Community(which abuts Shadow Wood Villas and Shadow Wood Park on the west)to accommodate reshaping and grading of the area adjacent to the proposed shallow swale. b. An existing 30 foot drainage easement located within Shadow Wood Villas and Shadow Wood Park from Station 109+95+/-to Station 114+58+/-will be utilized to construct the 54" culvert. Construction will include a shallow swale over the pipe to collect local drainage. A 10 foot wide TCE will be required along the east side of the Parkers Hammock Community(which abuts Shadow Wood Villas and Shadow Wood Park on the west)to accommodate reshaping and filling of an existing ditch in the area. c. From Station 114+58+/-to Station 133+16+/- a proposed 55 foot drainage easement, west of and adjacent to the west Wingsouth property line, will be used to accommodate a 12 foot maintenance travel way on the west, a 30 +/- foot wide canal, and space for side slopes and plantings. An existing ditch lying in an existing 30 foot drainage easement located within, and along, the west Wingsouth property line, will be filled. d. From Station 133+16+/-to Station 144+00+/-a proposed 37.5 foot drainage easement, north of and adjacent to a northerly Wingsouth property line, will be used to accommodate a 12 foot maintenance travel way on the west, a 35+/- foot wide canal, and space for side slopes and plantings. e. From Station 144+00+/-to Station 163+70+/- a proposed 37.5 foot drainage easement, west of and adjacent to the westerly Wingsouth property line, will 1:;7000:7599-7 WS LASIP Wingsouth A irpark;Correspondences`Memo:LASIP Wingsouth Technical Memo 3-16- 15.MEM.doc 10 Packet Page -251- 6/9/2015 11 .A. be used to accommodate a 12 foot maintenance travel way on the west, a 35+/- foot wide canal, and space for side slopes and plantings. Finally, the proposed improvements to the existing canal (C4C-01-C0005) north of the Wingsouth runway consist of the addition of maintenance pathways on each side of the canal and filling and reshaping of the canal itself to facilitate its maintenance. The proposed canal improvements in this area will be approximately 256 feet in length and will run from Station 163+70.36 to Station 166+26.54. The pathway along the north side will be constructed at an elevation of 10.25 NGVD along an existing spoil berm. This pathway will also function as a berm to prevent discharging of flow from the north directly into the canal, forcing it to flow through Weir C4C-01-50110. The improvements in this area have been located adjacent to the north property line of Wingsouth to take advantage of the existing canal location and to avoid encroachment into the existing Collier County Conservation Easement located north of and adjacent to the Wingsouth property line. The proposed drainage easement in this location is 71 feet wide to accommodate a 10 foot maintenance travel way on the north, a 36.75 foot wide canal, a 12 maintenance travel way on the south, and space for side slopes and plantings. 2. Safety Factors Construction of the LASIP improvements will provide needed stormwater outfall capacity for the Basin and thereby reduce the threat and damage of flooding. The Wingsouth Airpark portion of the project is a vital component of the system providing an outfall for sheet flow from the northern portions of the Lely Manor Basin. K:;77000`;7599-1WkS 1..ASIP Wingsouth Airpark':Correspondences Memo`•,LASIP Winasouth Technical Memo 3-16- 15.MEM.doc 11 Packet Page-252- 6/9/2015 11 .A. 3. Long Range Planning Factors The LASIP improvements including the Wingsouth Airpark project are part of the County-wide plan to improve the level of service for flooding and flow-way enhancement within the Basin and further the stated goals, objectives, and policies of the drainage/stormwater management sub-element of the Collier County Growth Management Plan to unify and implement the County-wide Stormwater Management Plan that provides an acceptable level of service for stormwater controls and environmental management objectives. The project improves the LASIP regional stormwater management system and natural flowways within the area. 4. Environmental Factors The LASIP system has been designed to limit the amount of environmental disturbance as much as possible. Natural flowways and sloughs have been preserved and incorporated into the design as much as possible. A pump system has been included in the design to re-hydrate an existing wetland slough by pumping excess stormwater from within the LASIP system into the slough. Weirs have been incorporated in the design in order to avoid over-draining the Basin. Spreader lakes have been designed at the ends of the three major outfalls to disperse the discharge as sheet-flow to the receiving waters/wetlands. As mentioned above, the Wingsouth Airpark project consists of improvements to existing canals and the design of Airpark system has been adjusted resulting in the least amount of environmental disturbance possible. 5. Costs Cost to provide the LASIP improvements including the Wingsouth Airpark project have been carefully considered as part of the alternatives analysis and design of the project. K: 7000 7599-7 W'S LASIP Win south :Airpark`Correspondences`Memo LASIP inasouth Technical Memo 3-16- 15.MEAt.doc 12 Packet Page-253- 6/9/2015 11 .A. As the project has been refined during the design and permitting process, more specific costs have been developed and considered as part of developing a financially feasible construction phasing and Capital Improvement Program. The design of a portion of the Wingsouth Airpark improvements along an existing canal maximizes the improvement benefits while minimizing the amount of impact to the environment and adjacent properties. We are pleased to advise you that the construction of the Wingsouth Airpark portion of this project is anticipated to commence during fiscal year 2016, and will comprise the final construction project for the LASIP system. Thank you for your time and review of this vital information. K: 7000 7599 7WS LASIP Wingsouth Airpark Correspondences.Mema':L_,AS1P\k'inggsouth Technical Memo 3-16- 15.MEM.doc 13 Packet Page-254- 6/9/2015 11 .A. CONCEPTUAL PERMIT APPLICATION LELY AREA STORM WATER IMPROVEMENT PROJECT LELY CANAL AND LELY MANOR BASINS Region 7 NAPLES, FLORIDA Prepared for: COLLIER COUNTY BOARD OF COUNTY COMMISSIONERS Naples,Florida Prepared by: AGNOLI, BARBER& BRUNDAGE,INC. Naples,Florida Revision 3 September 2001 ABB Project 7599 (Based in part upon materials previously prepared by Law Engineering and Environmental Services,Inc.) K:•I700017599 Lely Outfall BasinlCorrespondences\DocumentslABB RAI Responses Rev 3 9-20011Region 7140141 703 1 0.Regio n 7.doc Packet Page-255- 6/9/2015 11 .A. LASIP September 2001 ERP Application,Revision 3,Region 7 REGION 7 THE NORTHEAST AREA OF LELY MANOR BASIN K:1700017599 Lely Outfall BasinlCorrespondences\Documents\ABB RAI Responses Rev 3 9-2001IRegion 7\40141 70310.Region7.doc Packet Page-256- 6/9/2015 11.A. LASIP September 2001 ERP Application, Revision 3, Region 7 TABLE OF CONTENTS Pate REGION 7—THE NORTHEAST AREA OF LELY MANOR BASIN 7.1 INTRODUCTION 7-1 7.2 EXISTING CONDITIONS 7-1 7.3 EVALUATION OF ALTERNATIVES 7-4 7.4 PROPOSED PLAN 7-5 7.5 IMPACTS 7-9 LIST OF APPENDICES A: SOIL AND SEASONAL HIGH GROUND-WATER TABLE ELEVATION DATA B: HYDROLOGIC/HYDRAULIC ANALYSIS C: WATER QUALITY DISCUSSION D: CONSTRUCTION TECHNIQUES AND SCHEDULE E: DRAWDOWN DISCUSSION F: CONCEPTUAL AND PHASE ONE CONSTRUCTION PLANS G: ENVIRONMENTAL IMPACTS AND PROPOSED MITIGATION PLANS Packet Page-257- 6/9/2015 11 .A. LASIP September 2001 ERP Application, Revision 3,Region 7 REGION 7 THE NORTHEAST AREA OF LELY MANOR BASIN 7.1 INTRODUCTION Collier County is requesting an overall conceptual Environmental Resource Permit (ERP) and a construction and operation permit for Phase I of a storm-water management system project known as the Lely Area Stormwater Improvement Project(LASIP). These improvements will be made in the Lely Main Canal, Lely Branch, and Lely Manor drainage basins located in Naples, Florida. Phase One consists of improvements to the Lely Main Canal from US-41 to Rattlesnake Hammock Road (Region 2), the Lely Branch Canal located north of Rattlesnake Hammock Road (Regions 2 and 4) and the Lely Manor Main Canal eastern outfall (Region 5 east). There are no Phase I improvements in Region 3. Development pressures within these two basins (aka, Water Management District #6) have created a critical need for a primary storm-water management outfall system to address the current issues and those expected to arise. The term"primary storm- water management outfall system" is important to understanding the objectives of this application. A primary outfall system is designed to receive flows from developments along the route. It is the responsibility of the designer of each of these developments to meet current South Florida Water Management District (SFWMD) and Collier County rules for water quality and quantity discharges. For purposes of permitting LASIP is divided into seven regions grouped according to land use and hydrology. Regions 1 through 3 constitute the Lely Main Canal Basin, Region 4 is a tributary to the Lely Canal Basin named the Lely Branch, and Regions 5 through 7 are divisions of the Lely Manor Basin. This chapter of the application addresses Region 7. 7.2 EXISTING CONDITIONS Description — Region 7 includes land from the northeast corner of Naples Manor to the intersection of Davis Boulevard and CR 951, north of Rattlesnake Hammock Road. This region can be subdivided into three parts: 7-1 Packet Page -258- 6/9/2015 11.A. LASIP September 2001 ERP Application,Revision 3, Region 7 • The area north of Wing South Air Park (Sections 9, 10 and 3) and Section 15 (east of Air Park). This area is sparsely developed now, but future development is underway. • The area between Wing South Air Park, Royal Woods, and Rattlesnake Hammock Road. This area in Section 16 has some multi-family development and single-family homes on lots of various areas. Remnants of a flow way/slough are found in this area. • Section 21 —An undeveloped area with a flow way/slough located in the western '/<of the section. The area of Region 7 is 2,995 acres. Topography, Ground Water and Soils — Based on SFWMD/WMD#6 aerials with contours, the ground surface elevations in this region are: North and East of Section 16 9— 10.5 feet Section 21 7.1 —7.5 feet Section 16 7.9— 10 feet Overall,the topography is flat. The elevations in the flow way/slough are often less than 0.5 feet below the elevation of house pads and older roadway crowns. Sections 9 and 15, Northeast — The soils in this area are predominantly Pineda fine sands with a slow permeability. Ground water is within one foot of the ground surface 3 to 6 months of the year. After storm events, water may flow on the surface for 7 to 30 days. Isolated areas of more permeable sand can also be found in this segment of the region. An existing canal is located along the Section 9/16 and 15/16 border. Section 16 —The soils in Section 16 vary from being similar to the type described for Section 21 below in the north one-third of the section to a more permeable sand in the eastern one half Ground-water levels are rarely above the surface but the water table can be from 6 to 18 inches below land surface 1 to 3 months per year. The historic slough/flow way is evident by soil type on the soil survey map. This soil type is characteristic of marshes and water is often ponded at the surface for 6 to 9 months of the year. 7-2 Packet Page-259- 6/9/2015 11 .A. LASIP September 2001 ERP Application,Revision 3, Region 7 Section 21 - In Section 21 the soil types are Boca, Riviera limestone strata, and Copeland fine sands, Hallandale/Boca fine sands. These soils are found in cypress swamps and marshes. In most years, under natural conditions, these soils are ponded for 6 to 9 months or more each year. In other months, the water table is within 12 inches of the surface and recedes to a depth of 12 to 40 inches during extended dry periods. The soils map in Appendix A gives the soil types for this region. The descriptions for the soil types are also provided in Appendix A, along with additional data about water table elevations. Environmental — Land uses within this region have been delineated, but a wetland jurisdictional determination has not been completed. A wetland jurisdictional determination will be completed as part of the permit application for construction. Land uses, as described by the Florida Land Use, Cover and Forms Classification System (FLUCFCS) within Region 7, are shown in the conceptual plans. Wildlife and habitat surveys were not done for this conceptual permit application, but they will be done as part of the permit application for construction. Hvdrolo2y - The area north of Wing South Air Park is a flat area with storage available by virtue of ponded water and a few lower wet areas. An existing ditch (C4C-01-C0015) located at the Section 16/9 line collects runoff through breaks in an earthen berm, from areas directly to the north. Polly Avenue is at the western end of this ditch. To the east of Polly Avenue, storm water flows toward the Air Park. To the west, it flows toward Royal Wood. The topography in Section 15, which is east of Wing Air Park,varies with the higher elevations in the southwest corner of the section. A ditch is located along the east side of the Air Park. There is no outlet for this ditch. Therefore, stone water accumulates in this area to the east of the Air Park runway. Even if an outlet were available, the road ditch along the northern side of Rattlesnake Hammock Road is small and could not carry higher flows. The historic slough/flow way is evident in the area between the Air Park, Royal Wood and Rattlesnake Hammock Road. This flow way is part of the Rattlesnake Hammock Slough and extends from the northeast of the Air Park runway in a slightly northeast to southwest direction down to Rattlesnake Hammock Road. The slough continues in Section 21 down to Naples Manor. 7-3 Packet Page-260- 6/9/2015 11 .A. LASIP September 2001 ERP Application,Revision 3, Region 7 The same slough is located in Sections 30 and 31 (Region 5 East). Development has encroached into the flow way in Section 16 that tends to limit conveyance. Flows from upstream areas pass beneath Rattlesnake Hammock Road through culverts discharging into Section 21. Runoff from Section 21 and upstream areas drains to the south-southwest in the slough toward the northeast corner of Naples Manor subdivision. A roadway named Wildflower Way with four double 3' x 6' box culverts has been constructed across the flow path of the flow way/slough into Naples Manor and the Lely Manor Main Canal. Currently, storm-water flows from upstream do not enter the Lely Manor Main canal along the north edge of Naples Manor except during periods of high flows. At present, the Lely Resort Development has been designed to handle all the flow from Rattlesnake Hammock Slough through their development. The permits for the Lely Resort Development and the construction of a new access road to the Lely High School identify the planned discharge of one-half total inflow into the Lely Manor Basin once the proposed system described herein has been constructed. Flooding Problems — Developed areas in Section 16 and along Sandy Lane experience flooding. Some street and yard flooding occurs in Wing South Air Park. Data from "Jerry" confirms that water levels will reach 0.6 feet above ground surface in the area near the intersection of Rattlesnake Hammock Road and Polly Avenue. Sheet flow from the slough in Section 21 frequently overtops the St. Andrews Blvd. Curb and causes road flooding. A computer model was developed to simulate existing condition hydrology for a 25-year, 72-hour storm event. Storm-water runoff flows to the south by sheet flow. There is no canal to collect flow, so water ponds in one low area, overflows into the next downstream, and so on until it reaches the slough in the area north of Naples Manor. For more information about hydrology and the model,refer to Appendix B. Water Quality — This region includes a variety of water quality in storm water runoff, from undeveloped land to residential land. For more information about water quality, refer to Appendix C. 7-4 Packet Page-261- 6/9/2015 11 .A. LASIP September 2001 ERP Application,Revision 3,Region 7 7.3 EVALUATION OF ALTERNATIVES The approach to finding a plan to accomplish the objective in this region was to use the existing system to the extent possible. The topography in this region is very flat and storm-water runoff flows slowly across numerous shallow low areas and into the slough system. The slough is also flat and without an outlet. A field examination of the slough identified a large amount of exotic infestation, primarily Brazilian pepper. There were also indications that the slough was not receiving historical normal flow, probably due to restrictions to sheet flow. It was decided to utilize the flow way slough to the extent possible rather than excavate a canal to collect storm water. This approach will reduce the area of possible environmental impacts and provide more water to the slough for longer periods of time. Development in the area is already encroaching into the slough/flow way conveyance and there are a number of projects in the final permitting stages that further limit options in this region. The plan proposed in the following paragraphs is considered to be the only viable alternative for accomplishing the project objectives. 7.4 PROPOSED PLAN Description - A man-made channel (C4C-01-C0015) that exists along the boundary between Sections 16 and 9 will be used to collect and carry runoff from northern areas. A culvert with a sluice gate (LCB-12-S0110) will be placed beneath Polly Avenue to interconnect Regions 3 and 7 to allow water to flow between regions, if necessary. Under normal conditions the gate will be locked closed. The existing spoil berm on both sides of C4C-01-00015 will be modified as needed to make it a suitable maintenance road on the south and a reliable berm on the north. On the south side of the channel, some fill will be added to make the road continuous. There is currently at least one break in the north berm opposite of the Air Park runway. A weir (C4C-01-S0110) will be constructed at this location (Link 506) with a 30-foot crest length and crest elevation of 9.4 to control water elevations in areas upstream of the improved canal. The weir will be constructed with a 3-by 3-foot sluice gate to allow for emergency dumping of water. The existing man-made channel (C4C-01-C0005)located immediately east of the Air Park runway will be modified as needed to carry upstream flows. Refer to the conceptual plans for the 7-5 Packet Page-262- 6/9/2015 11.A. LASIP September 2001 ERP Application,Revision 3, Region 7 proposed cross section. A large portion of the runoff from the drainage area to the north enters the system here. The proposed channel improvements extend from the 9/16 section intersection south to Rattlesnake Hammock Road. Near the south end of the channel on the east side of the Air Park runway (C4C-01-C0005) a weir (C4C-01-S0100) will be constructed. The crest length will be 30 feet, the crest elevation will be 9.0, and there will be a 3-by 3-foot sluice gate for emergency dumping of water. This elevation is compatible with the control elevation for the permitted development to the east (Naples Forest- Toll Brothers). A spoil berm exists to the east of the canal (C4C-01-C0005). The proposed improvements include shaping this spoil berm and adding fill, as needed so it can be used as a maintenance road. The downstream weir (C4C-01-S0100) will discharge into a 4- by 8-foot box culvert (C4C-01-S0700) to be constructed along the Rattlesnake Hammock Road right-of-way. This long box culvert will then discharge into the existing culvert (C4C-00-S0500) beneath Rattlesnake Hammock Road. A second 4' x 12' barrel will be constructed to C4C-00-S0500 to provide adequate outfall capacity into the slough south of Rattlesnake Hammock Road. Refer to the conceptual plans for drawings of the weir and outlet culvert. The control elevations for the area to the north and east of the Wing South Air Park were taken from permit data: • Naples Forest 9.4 feet • Club Estates 9.0 feet • Naples National 9.7 feet Weirs in the improved canal located immediately to the east of the Air Park will maintain water levels consistent with permit values. In addition to improvements along the north and east sides of Wing South Air Park,water will also be conveyed, via a 3' X 5' box culvert (C4C-02-S0110), into an existing channel excavated along the west side of the Air Park. This channel (segments C4C-02-00035 thru C4C-02-0055) is proposed to return flows into another portion of the remnant historic slough/flow way. Improvements will be made to this existing channel along the west side of the runway and 7-6 Packet Page-263- 6/9/2015 11 .A. LASIP September 2001 ERP Application,Revision 3,Region 7 residential development. Bottom widths of 3 and 5 feet and depths of 3 to 4.5 feet are proposed for the improved channel. A weir (C4C-02-S0100) is to be placed in this channel west of the Air Park to force water via overland flow to a cypress wetland. The location was chosen to take advantage of lower elevations to the west of this canal. From the western side of the wetland, storm water will flow south through proposed culverts (C4C-03-P0015) and then south through another short segment of the slough before outletting at Rattlesnake Hammock Road. Flows that pass over weir C4C-02- S0100 will flow through the existing channel(C4C-02-C0005)to Rattlesnake Hammock Road. One additional box culvert will be added beneath Rattlesnake Hammock Road to carry future storm-water flows from existing and future developments and from the improvements proposed here. The Lely Manor main canal located in the northeast corner of Naples Manor receives flows from Section 21 and from drainage basins upstream of Rattlesnake Hammock Road. Flows will enter the Lely Manor main canal across a 100 foot long weir (LMB-00-S0120) with a crest at elevation of 7.0. In accordance with permit considerations for the Lely Resort Development, one half the flow from upstream will enter the Lely Manor system and the other half will be received by the adjacent development. Storm-water runoff in the large Rattlesnake hammock slough will pass beneath Wildflower Way through 4 large box culverts and thence flow overland through the existing slough to the 100 foot long weir. A tabulation of structure and channel geometry is given in Appendix B. Ground Water—The weirs described above will allow the County to maintain ground water levels at or above existing levels. Hydrology — A computer model was developed to simulate future condition hydrology for a 25- year, 72-hour storm event. Future condition hydrology accounted for future land use changes. The area north of Wings South Air Park is in various stages of development ranging from pre- application meetings to construction of the facilities. Directly north of the Air Park in Section 9 and part of Section 4 is a permitted development that (Naples Heritage) discharges 10 cfs to the south/east Region 7 system and 4 cfs to the west across the area to the north of Sunset and Sandy 7-7 Packet Page-264- 6/9/2015 11 .A. LASIP September 2001 ERP Application, Revision 3,Region 7 Lane (Region 3 system). Further to the north and east, near the intersection of Davis Boulevard and CR 951 is future development that will discharge 66 cfs to the neighbors to the south. Along CR 951 are two other developments (Naples National and Club Estates, Ltd.) that will discharge toward the north end of the Air Park runway. Conveyance to provide an outlet for the developments to the north is via sheet flow through preserved wetlands that ultimately direct flow toward the northeast corner of the Air Park. Section 15 is to the east of the Air Park and contains a 99 acre vacant tract plus the Naples Forest (Toll Brothers) development. Supposedly, the Naples Forest development has storage up to the 25-year storm, and their design includes a flow way preserve along the western boundary of the section and immediately east of the Air Park runway. Limited future development is projected in the area bounded by Wing South Air Park on the east, Royal Wood on the west, Section 9 to the north and Rattlesnake Hammock Road. The areas that have not been developed are located immediately to the west of the Air Park runway and in the middle of the southern half of this section. The remnants of the historic slough are bounded on all sides by existing or future development. New developments will have to meet SFWMD and County requirements, and that was accounted for in the model. A summary of flow rates predicted by the model are presented below. For more information about hydrology and the model,refer to Appendix B. A tabulation of flows and stages is given in Appendix B. Water Quality — The detention created by the various weirs in this Region will provide water quality treatment. A calculation of the water quality treatment provided by the live storage within the modified canal system is provided in Appendix C. Increasing volume in the canal will increase travel time. This will allow more sediment settlement and will permit more nutrient conversion to a more stable form, such as ammonia to nitrate Construction, Operation and Maintenance — Collier County will be responsible for all aspects of the construction of the proposed improvements in this region. This includes preparation of 7-8 Packet Page-265- 6/9/2015 11 .A. LASIP September 2001 ERP Application, Revision 3,Region 7 construction drawings and specifications, obtaining all local, regional, state, and federal permits, implementing the provisions of the permits, managing the construction and providing certifications. The County plans to hire firms/contractors to complete the various components of the work. A discussion of construction techniques and schedule is given in Appendix D. Collier County will be responsible for the operation and maintenance of the proposed improvements. The County will provide an operation schedule for the gated structures and a schedule for maintaining the proposed improvements in the application for construction. 7.5 IMPACTS Permanent Impacts - Permanent impacts will occur as a result of excavation of canals and construction of weirs and culverts. Temporary Impacts —Construction access will be needed to secure the berm along the north side of channel C4C-00-00015 and excavate the canal (C4C-02-00035 through C4C-02-C0055) along the west side of the Wing South Air Park. Secondary Impacts—The proposed design call for weirs to maintain water levels in the area above the current levels, so the ground-water level in adjacent lands should be higher than existing conditions. No secondary impacts are expected. A tabulation of wetland and upland data is given in Appendix G. A summary is given below: Area (acres) Wetlands Impacts 3.4 Other Surface Water 1.0 Uplands 6.0 Total Project Area 10.4 In order to evaluate how well the proposed system will maintain water levels in the wetland located north of the northeast corner of Naples Manor during storms that will occur more 7-9 Packet Page-266- 6/9/2015 11 .A. LASIP September 2001 ERP Application, Revision 3,Region 7 frequently, a 5-year, 24-hour storm event was simulated with the model. The results are tabulated below. In each case the water level is at or above the adjacent ground. Model Prediction Location (feet NGVD) Split,near Wildflower 7.7 South side of Rattlesnake Hammock Road 8.3 North of Rattlesnake Hammock Road North side of Rattlesnake Hammock Road 8.3 Slough, west 8.3 Slough, east 9.2 7.85 8.79 North Air Park, section corner 9.2 Air Park Runway canal 9.0 Rattlesnake south of runway weir 8.3 Toll Bros wetland 9.8 North of Toll, Club Estates, etc. 10.1 Surveyed land surface = 7.85 Surveyed high water = 8.79 7-10 Packet Page-267- 6/9/2015 11 .A. LA SIP September 2001 ERP Application,Revision 3, Region 7 Table 7.2 Region 7 was analyzed as a hydrology area, so no hydraulics data are given. Packet Page -268-