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MSTBU WM Agenda 02/01/2021PELICAN BAY SERVICES DIVISION Municipal Services Taxing &Benefit Unit NOTICE OF PUBLIC MEETING FEBRUARY 1, 2021 THE WATER MANAGEMENT COMMITTEE OF THE PELICAN BAY SERVICES DIVISION WILL MEET AT 9:00 AM ON MONDAY, FEBRUARY 1 AT THE COMMUNITY CENTER AT PELICAN BAY, 8960 HAMMOCK OAK DR., NAPLES, FL 34108. AGENDA 1. Pledge of Allegiance 2. Roll call 3. Agenda approval 4. Approval of 01/23/20 meeting minutes 5. Audience comments 6. Current state and expected timing for Oakmont Lake 4-1 remediation project a. Detailed plan able to be used for bidding b. PBSD Board decision to proceed with Lake 4-1 c. Expected procurement elapsed time d. Estimated timeline for construction e. Methods of remediation, including mixed use of Rip Rap and Geotube 7. Criteria used to prioritize lake bank restoration 8. Incremental criteria including visibility, current functional or aesthetic problems 9. Staff progress report 10. Adjournment "indicates possible action items ANY PERSON WISHING TO SPEAK ON AN AGENDA ITEM WILL RECEIVE UP TO THREE (3) MINUTES PER ITEM TO ADDRESS THE BOARD. THE BOARD WILL SOLICIT PUBLIC COMMENTS ON SUBJECTS NOT ON THIS AGENDA AND ANY PERSON WISHING TO SPEAK WILL RECEIVE UP TO THREE (3) MINUTES. THE BOARD ENCOURAGES YOU TO SUBMITYOUR COMMENTS IN WRITING IN ADVANCE OF THE MEETING. ANY PERSON WHO DECIDES TO APPEAL A DECISION OF THIS BOARD WILL NEED A RECORD OF THE PROCEEDING PERTAINING THERETO, AND THEREFORE MAY NEED TO ENSURE THAT A VERBATIM RECORD IS MADE, WHICH INCLUDES THE TESTIMONY AND EVIDENCE UPON WHICH THE APPEAL IS TO BE BASED. IF YOU ARE A PERSON WITH A DISABILITY WHO NEEDS AN ACCOMMODATION IN ORDER TO PARTICIPATE IN THIS MEETING YOU ARE ENTITLED TO THE PROVISION OF CERTAIN ASSISTANCE. PLEASE CONTACT THE PELICAN BAY SERVICES DIVISION AT (239) 597-1749. 01/25/2021 10:25 AM PELICAN BAY SERVICES DIVISION WATER MANAGEMENT COMMITTEE MEETING JANUARY 23, 2020 The Water Management Committee of the Pelican Bay Services Division met on Thursday, January 23 at 1:30 p.m, at the SunTrust Bank Building, 801 Laurel Oak Drive, Suite 302, Naples, FL 34108. The following members attended. Water Management Committee Jacob Damouni (absent) Weir Denise McLaughlin, Chair Torn Cravens N Pelican Bay Services Division Staff eil Donill, Administrator Chad Coleman, Operations Manager Lisa Jacob, Project Manager Also Present Jim Carr, Agnoli, Barber & Brundage Susan O'Brien, PBSD Board Michael Wei Alex Murnm, Sr. Field Supervisor (absent) Barbara Shea, Interim Operations Analyst APPROVED AGENDA (AS PRESENTED) 1. Pledge of Allegiance 2. Roll call 3. Agenda approval 4. Approval of 11/21/19 meeting minutes 5. Audience comments 6. Current projects a. St. Maarten/St. Thomas Lake 2-9 b. Bay Colony Beach Dune Swale c. Grosvenor/Dorchester drainage basin 7. Prioritizing lake bank restoration projects for next FY21 budget 8. Review of Pollution Control Report 9. Review of algae problem in target lakes 10. Other committee member comments 11. Adjournment ROLL CALL Mr. Damouni was absent and a quorum was established Pelican Bay Services Division Water Management Committee Meeting January 23, 2020 Mr. Cravens motioned, Mr. Weir seconded to approve the agenda as presented. The motion carried unanimously. APPROVAL OF 11/21/19 MEETING MINUTES Mr. Cravens motioned, Mr. Weir seconded to approve the 11/21/19 meeting minutes as presented. The motion carried unanimously. AUDIENCE COMMENTS Ms. O'Brien requested that Mr. Dorrill provide the PBSD Board with an update on the Operations Analyst Position and "who's doing what" by the existing staff during this interim period. CURRENT PROJECTS ST. MAARTEN/ST. THOMAS LAKE 2-9 Ms. Jacob commented that the Lake 2-9 lake bank restoration project is scheduled to begin in April. BAY COLONY BEACH DUNE SWALE Ms. Jacob reported that the Bay Colony Beach Dune Swale project is out for bid; bids are due back on Feb. 12, GROSVENOR/DOI2CHESTER DRAINAGE BASIN Ms. Jacob commented that she expects our ABB engineer, Mr. Jim Carr, to finalize the design plans for the Grosvenor/Dorchester drainage basin project by tomorrow. Once received, she will put the project out for bid. Mr. Dorrill commented that the project will include malice removal only in areas affecting the re -alignment of the swale. Ms. O'Brien asked for clarification on the length of time and complexity of this project. Ms. McLaughlin suggested that when the drainage pipes were unblocked, unnatural drainage flows were created, causing additional work to be needed. PRIORITIZING LAKE BANK RESTORATION PROJECTS FOR FY21 BUDGET The committee reviewed and discussed the prioritized list by critical need of lake bank remediation of our PB lakes, which was created by ABB a few years ago. Mr. Carr commented that he estimates costs of remediation have risen by approximately 40% since this list was created. The committee and staff tasked Mr. Carr to update the estimated cost of remediation for the top 7 lakes on the list (omitting Lake 2-9 for which a project is currently in process). Mr. Coleman noted that lakes 1-6, 4-1, and 2-5 are on our list of targeted algae lakes and in the top 10 of our prioritized lake bank remediation list. Mr. Car suggested that it would be worthwhile to do a walk around all of our lakes to determine whether any of the lake bank conditions have changed. Mr. Dorrill commented that he will contact Mr. Dave Mangan, General Manager of the Club Pelican Bay golf course, to determine whether he feels we should address lake bank remediation of lakes 2-8 and 4-11 (within the golf course) in light of the recent golf course restoration work. 2 Pelican Bay Services Division Water Management Committee Meeting January 23,2020 Ms. O'Brien suggested that we consider asking an engineer from the South Florida Water Management District to do a walk around at the top seven lakes that are under our consideration for lake bank remediation and share with us what they are expecting us to do relative to our permits. Mr. Dorrill commented that he is not interested in doing this. Ms. O'Brien commented that the board has had discussions to bundle lake bank projects and include these into our upcoming large project financing package. REVIEW OF POLLUTION CONTROL REPORT Ms. McLaughlin reported that she recently had a meeting with Mr. Coleman, Mr. Mumm, and Ms. Jacob to discuss the report of recommendations to improve water quality, prepared by the County's Pollution Control Dept. A list of all the recommendations along with (1) priority, (2) staff required, (3) doing now?, (4) cost, (5) complexity, and (6) a proposed plan for each item was included in the agenda packet. The committee and staff discussed the first 11 items on the list, and follow up that was agreed upon is as follows: • Mr. Dorrill will look into the feasibility of bagging grass clippings. • The possibility of the PBF employing an inspector that safeguards against water quality impacts to the stormwater system could be included for discussion at a future PBF/PBSD workshop. The committee suggested that the PBF would be the more appropriate entity to take on this responsibility as they have enforcement capability. • Mr. Dorrill will ask staff to identify a test lake to plant littoral plants to study whether these plants will cause a reduction in algae. • Mr. Dorrill will contact the Grey Oaks community to obtain information on the device they are using to mechanically remove algae. • Mr. Coleman will determine whether all of our lakes with algae problems have aerators installed. • Ms. Jacob will contact our environmental consultant, Mr. Jeremy Sterk, to determine whether he would be able to systematically determine whether our aerators are causing algae reduction in our lakes. The meeting was adjourned at 2:59 Denise McLaughlin, Chair Minutes approved [_] as preseirted OR [_� as amended ON 1 date IF 4 MEN ■■■■■AA ■..■1t'GNOLI . :::::�B RBER;. s :�i'u'a::� RUNDAGE, FIN #p a r �. 11 , All t fir, a 71 cFOCI IjoF,, IF IF fl QrSS- - nn t Af is 0. 111 IF IF IF IF I IF IF IF �41, i FIFF 4Fall 41wm oil I Vol �►n�c r / r �tt�� Fri a e,:;to J Background Erosion can be defined as the gradual removal or movement of soil from one area to another caused by water, wind, or other natural causes. Lake bank erosion is very common is southwest Florida due to the variance in seasons it faces. It can be caused by strong winds that damage the shoreline such as in events like Hurricane Irma and overland runoff. A site visit was conducted on August 61h, 2020 for lake 4-1 at Pelican Bay to measure erosion and assess the condition of the lake banks. Even though all indications of erosion are noted when conducting site visit, the primary form of analytical data that is taken to determine the degree of erosion are measurements of both escarpment height and slope. Escarpment height can be defined as any sudden drop-off that separates the lake bank from the elevation just inside the water's edge. It is important to note that drop-offs are common for any lake however any drop-off over 9 inches exceeds the permitted threshold for the South Florida Water Management District (SFWMD) permit. The slope can be defined as the degree of inclination of the ground. The slope is an indicator of erosion because the slope determines the rate at which water flows over the top of lake banks, its action will accelerate the process of erosion. Like the escarpment height, there is a permitted limit of how steep the slope may be. Any slope greater than 4:1, meaning a length of four feet for every foot in depth, is considered out of compliance with the SFWMD permit. Wind is a major factor in creating waves, fortunately for Lake 4-1 the longest distance from the east to the west side of the lake is about 260 linear feet however the length from north to south is quite significant. Approximately 2600 linear feet separates the north and south sides of the lake, leaving it prone to erosion. Incoming cold fronts and increased wind from storms can create waves that worsen the condition of the lake banks and create additional problems. The long fetch allows the waves to build up energy before crashing into the lake bank requiring a more robust and reinforced shoreline. LIP I ; � 1t ILL LLO 41 'Y '' - t.sk f o ar t °k r si 9 ... L. :i.: f� hr PFF rH 10 •f . Agenda item #6 PELI g BAY Financial Summary Given the amount of lake bank Lake 4-1 provides, there are different restoration options depending on expenses and degree of erosion. Generally, there are three methods of restoration, installing rip -rap, a geoweb system or simply regrading the existing lake bank to comply with the standards. Rip -rap is primarily made-up of lime rock that have been sized to have a mass that resists manipulation due to wind and wave action. The rocks sit on top of a liner that allows water to slowly percolate into the soil rather than creating large divots in the lake bank caused by the overland runoff. It is important to note that SFWMD only permits a maximum of 40% of the lake bank to be hard cover (seawall or rip -rap). Lake banks exceeding 40%. if permitted, typically require additional mitigation such as increased littoral plantings. Geoweb is athree-dimensional system made up of interconnected cells that reinforces the lake bank due to the infill inside of these cells. The type of infill selected depends on the extent of the erosion, however in this case, compacted soil would be used. This will allow vegetation to grow through the cells keeping the aesthetic view of a natural lake. This would require minimal maintenance however the additional maintenance would out -weigh the cost of long-term severe erosion. The third option is to re -grade the existing lake bank to restore it to the permitted conditions. However, it must be noted that only regrading the lake bank will provide a short-term solution rather than a longer term structural enforcement. The geoweb and regrading options may require additional costs regarding imported fill. Due to significant slopes and drops -offs, fill is required in some areas to satisfy SFWMD standards. The field data collected in Appendix A determined that there are areas that are considered more severe than others. Therefore, different options regarding the extent of restoration has been provided below. For further financial information, refer to the tables in Appendix B. DRAINAGE Fill Requ STRUCTURE Ii lmd S: 4:1 - - r- S: 4:1 r JSiconsideted out of compliance with pi S'f0 v e S: 4:1 lwrr - , 5: 4:1� � -u i KID S: 4:1 / owl S: S: 4:1� t 5: 5:1 S: 4:1 Flklict :4:1 i S: 4:1 _ 1 _ t 5: 4:1 ,— - RifCh ppl n r A. S: 4:1 i r• S 51 y f 5:4:1 p 1-,do TAs rie � S:5:1 S: 4:1 w �� H: 9 p l f.ekV- p' Lan S: 4:1 ' I j .: � ��'�7 r1 r innernar��L-n H:9.i S:5:1 Imor iivo(D � Ln f a ©� ., + t t . . �. S: 8:1 F t S: 10:1 7r S: 4:1 l:i5FTl�F� ry Ptr�e did f :77du psi S: 8:1 For pc V M0he ) S: 4:161 • (92020 gr o } t r ;.. reE� �r Q� waW Alf! a� - Appendix B Agenda item #6 Page 7 of 12 PYeliminary Budget Estimate Item No. Description Unit quantity Unit Cost Total Cost OPTION 1: GEO-WEB SYSTEM &RIP -RAP GEO-WEB SYSTEM 1 Mobilization LS 1 $ 125,000 $ 125,000 2 Landscape Replacement (Sod, Native Vegetation) (1 O' wide x 3,025 LF) SF 30,250 $ 3 $ 90,750 3 Irrigation Replacement in impacted areas (10' wide x 3,025 LF) SF 30,250 $ 2 $ 60,500 4 Littoral Plantings @ 2 per linear foot of modified lake bank EA 6,050 $ 4 $ 24,200 5 In Place Compacted, Imported Fill CY 6,842 $ 100 $ 684,200 6 Silt Fence LF 31025 $ 2 $ 6,050 7 Turbidity Barrier LF 100 $ 30 $ 31000 8 Yard Drain Connections @ approx. 2 per lot/home (includes ADS 12" Yard Drain) EA 27 $ 1,009 $ 275000 9 Sandy Top Soil with 10%-12 % Organics (3" deep over impacted areas) 3,025 LF x 8' x 3") CY 224 $ 100 $ 22,407 10 GeoWeb- GW 30V3 12' wide Includes backBil, 57 stone, anchors, non -woven fabric SF 36,300 $ 15 $ 544,500 SUBTOTAL - $ 1,587,607 RIP -RAP 1 Ri Ra 12" to 24" with Underla ment 4' wide x 1,950 LF) SY 733 $ 300 $ 220,000 2 In Place C0 n acted, Imported Fill CY 11420 $ 1O0 $ 142,000 SUBTOTAL - $ 362,000 GnAND TOTAL - $ 1,949,607 Note: Estimated costs are pre -survey and are approximate. Cost estimates tlo not inalpde survey, site permltBng or desl9a plans. Agenda item #6 Page 8 of 12 Preliminary Budget Estimate Item No. Description Unit Quantity Unit Cost Total Cost OPTION 2: RE -GRADE &RIP -RAP RE -GRADE 1 Mobilization LS 1 $ 1253000 $ 125,000 2 Landscape Replacement (Sod, Native Vegetation) (10' wide x 3,025 LF) SF 30,250 $ 3 $ 90,750 3 Irrigation Replacement in impacted areas (10' wide x 3,025 LF) SF 30,250 $ 2 $ 60,500 4 Littoral Plantings @ 2 per linear foot of modified lake bank EA 6,050 $ 4 $ 24,200 5 In Place Compacted, Imported Fill CY 61842 $ 100 $ 684,200 6 Silt Fence LF 33025 $ 2 $ 61050 7 Turbidity Barrier LF 100 $ 30 $ 31000 8 Yard Drain Connections @ approx. 2 per IoNhome (includes ADS 12" Yard Drain EA 27 $ 11000 $ 27,000 SUBTOTAL - $ 11020,700 RIP -RAP 1 Rip-Ra 12" to 24" with Underlayment (4' wide x 1,950 LF SY 733 $ 300 $ 220,000 2 In Place Compacted, Imported Fill CY 11420 1 $ 100 1 $ 1421000 SUBTOTAL = $ 362.000 GBAND TOTAL - $ 1,382,700 No[e: Estimated costs are pre -survey antl are approximate. 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