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PBSD MSTU Backup Documents 11/21/2024Hi and thanks for your time. I'm Patrick Wack, President of the Seagate POA. I'm joined by Jo Ann Jany, who is representing Naples Cay. First of all, we'd like to thank the Clam Bay Water Committee for engaging with us in September. Now, we have three reasons for caring about the Bay: 1. Clam Bay is a jewel of Collier County. 2. Relative to our own waterways, we'd prefer to not receive impaired water. 3. Finally, The Bay is our backyard for many recreational activities, including kayaking, paddleboarding, and fishing. It is integral to our quality of life and property values. In the spirit of finding a solution to a growing problem, we have a few observations culled from the PBSD reports. We have provided your Chairman with a few copies of the supporting information. Let me summarize: 1. In 2023, for at least the 7th year in a row, Clam Bay had nutrient impairments. See page 2. 2. Last year, Clam Bay was put on FDEP's list of impaired waters. See page 2. 3. Seagrass and Mangrove health have declined. See Page 3. 4. Water levels within the mangroves South of Clam Pass seem to be pooling due to inadequate flushing. See Page 4 o Qualitatively, Jo Ann who volunteers almost daily in the park, and is a Florida Master Naturalist, has noted this. 5. Per both the 2016 NRPA, and 2016 enabling ordinance adopted by the BCC, PBSD is responsible for "Monitoring and maintaining water quality within the Clam Bay NRPA." ... "Ensuring the estuary has adequate tidal and freshwater flows to maintain ecological health." ,and, of course, the health of the mangroves. All of these mandates include areas South of the Pass. See Page 4 6. Finally, we had a chance to review TP & TN nutrient hotspots within Pelican Bay. See page 5. o We acknowledge that Pelican Bay is a large community with over 80 HOAs and many private property owners, and appreciate PBSD's efforts to educate these groups on fertilization and watering practices. We have also undertaken similar efforts. While addressing nutrient sources should always be at the forefront, our engineers believe that there may be a path to improve tidal flushing through a different inlet (pass) dredging plan. Additional data will be required to validate these concepts. We look forward to our December 2nd meeting with PBSD and our engineers to discuss ways to improve the current dredge footprint. In Conclusion, almost a year after we first raised these issues, the question becomes, what will be the plan, if any, to address the water quality? 1 WATER QUALITY OVERVIEW Earthtech compiles an annual report. Reports are available on the Pelican Bay Services Division website. Over many years, the system's water quality and ecological health have been degrading. 2020-2023 Reports • 2020 =impaired for TP and DO • 2021=impaired for TP and DO • 2022 =impaired for TN, TP, and DO • 2023 =impaired for TN and TP • 2023= FDEP added Clam Bay to its draft verified impaired list for TN & TP. On Wed, Dec 20, 2023 at 8:13 AM Tyler, David <David.Tyler@dep.state.fl.us> wrote: Hey Patrick, It was good chatting with you the other day, -Clam Bay�WBID 3278Q4) is impaired and on the draft list for TN and TP NOTE: There are now 2 WBIDS for PB Clam Bay and Clam Bay Inland Home � Biennial Assessment 2022 - 2024 Draft Lists i]Details g�Basemap 8 About 0 Content ,= Legend .1 + Legend Paln VERIFIED LIST Pelican Ma DELI5T LIST � � , STUDY LISP rth Na From the 2020 5 Year Review Results suggest that phosphorous concentrations are at potentiallyproblematic levels in Clam Bea �, and they should be carefully monitored, to ensure that conditions do not deteriorate. Similar trends were found for nitroaen. Unfortunately. the trend over the Dast six vears has been of an increase in both nitroaen and phosphorus. at least in Outer Clam BaL." (Outer Clam Bay feeds into the Naples Cay and Seagate). 2 ECOLOGICAL DECLINE Average Health of All Plots Over Time „zs9 ._.. _._.__..._. _. _._ _.. 8 z.]2 ].13 ����� y 182 1.80 ].8J .1.b6 1.92 ].92 y 1.00 --.-.- 1.83 --..- — -1.81 - i1.89....................................... ... ..lr�{...163 d' 1.50 aR 1.00 J.016 Mar Mar 6¢p Apr 8�p Mar Sep Mar Apr 201) 201> 2018 301ft 2019 20]9 2020 20't0 2U31 2021 2022 2022 2023 2023 Mpnlipring Date GRAPH 1. Averog¢ NAS of all mm�Rrpro plots 2M6- 2023 • Since 2016, 15%decline re -Ian in average health • 2016 to post -Ian = 25%decline • Milton will not improve the situation • Water flow is more critical than ever • Outer Clam Bay has significantly stressed areas Average 5eagrass Cover in each Transect m �] � E m 3 }�„ ul � i '' I � �'Iii� .I .' Transett A Transer 2 Toansett 3 Trarosect 4 Transed 5 Transett 6 ■2418 �2©29 ■T424 x2421 i2ti22 Systematic Decline to less than 5°/D average cover o� 3 MANGROVE WATER LEVEL Higher average water level is indicative of decreased flushing Clam Bay South Well No. 1 - -Wnar Cycle ----Water Level (It) �NaturalGround (Oft)--aalnrall (in) 5 _.. __—_____ —_.-- _—___--._—_—_.___ _.�____--_ � Hurricane Irma � Hurricane Hurricane Idalia Milton q-....—_. _.__ _-.._.._..__..___.. __ __....._...-..___..- _ _.._. ____.__ Hurricane tan G 0 a; __.______._.-...._.__._____.._—___.____..__._..__...._..._.__.. _.,.. 5 lry7 5 2 __.___...—___._... __..__.._...._.____.__ .— __-.__� __ _ Z d Ni � Pi. , T PT=I- j ll f_t � _ , _ o 3 .i )J l 1 � � � � � � I�f � z j 2 ! i I �- _— -- - i 1 - - --- ,i � - i I � d 0 mNnaom�,���tla�cc,"���ms����m�c�"ce��$C�c��e���� 7. 2016 NRPA Coordination with community members and stakeholders has been balanced with anticipated administrative and financial resources to develop the following goal and supporting objectives for this Management Plan. All activities in support of these objectives will be prioritized and governed by the PBSD and available funding. Goal: To establish the basis for management activities that will be undertaken to protect the health of the Clam Bay NRPA estuary. Objectives to support this goal include: 1. Maintain and protect the native floral and faunal communities within the Clam Bay NRPA 2. Ensure the estuary has adequate tidal and freshwaterflows to maintain ecological health within the Cdam Bay NRPA 3. Monitor and maintain water quality within the Clam Bay NRPA 4. Monitor archaeological sites within the Clam Bay NRPA 5. Ensure recreational activities are environmentally compatible within the Clam Bay NRPA !� NUTRIENT HOT SPOTS Levels are � 10x higher than the Bay. , � ,US..r1,N lry; ti*., I I� I ~` ti 'r�ir '�, m• v o • , • ,:� � �� a � yi 1'^.' f ..! ;�; � . • a• �O; � rnuandAuv.ounrgv=�d � 1�r �lv '' `�� �o . .q �. TN Concentration {mg/L) • 0.1 0 9-0.75 IrJ� 1.76-2 • 9,25 � 0.76 -1 U 2.01 - 2.Y5 • 9.5 � 1.91-1.25 0 2.26-2.5 • 9.75 � 1.26-1,5 ®2.51-2.75 • 1 � 1.51 _ 1,75 ®2.76-3 • �N ' u o� 'au �� EXAMPLE STUDIES- SIMILAR SITUATIONS These are 100 page+studies. Blind Pass- Captiva 2016 Flnal Report Impact of Dredging the Lower Narrow River on Circulation and Flushing In the Narrow River Prepared for: Rhoda Island Coastal Raaurces Management Council Authon: Cralg 6wamen, Swenson Environmental Associates Malcolm 6pauldingand Aba Shaw, ocam Engineering, Unlvarcity of Rhode Island Oata: 15 August 2616 �`. The overall objective of the modeling effort is to The US Army Corps of Engineers (USAGE) Water evaluate coastal processes at Blind Pass and Management Section discussed results of a analyze alternatives for their effect on the inlet, numerical modeling study to determine the relative adjacent islands and coastal system. impacts of incremental dredging alternatives at the The three-dimensional DeIft3D model consists of mouth of Narrow River ranging from 28,000 cubic several modules for the simulations of physical yards to 68,000 cubic yards. The modeling processes such as wave transformation, considered effects on tide range, current speeds, hydrodynamics, sediment transport. erosion. scour peak volume flows, and tidal prism/flushing time and deposition. After developing the model setup changes. and calibrating the wave, flow and morphology hips•//narrowriver org/wp-content/uploads/2022/09/2 modules using measured datasets, the numerical 009 04 21-Armv-Corps-DRAFT-NARROW-RIVER-A modeling tool was applied to evaluate sand pendix-A-H-H-Re ort. df bypassing, inlet processes and the performance of p p p potential alternatives. In 2016, the US Fish and Wildlife Service (USFWS), https://www.leeaov.com/naturalresources/Documents USAGE, and CRMC recommended that a numerical /Blind%20Pass%201n1et%20Manaaement%20Stu� modeling study be undertaken to determine what the 20Appendix%20and%20Sub%20Appendices.pdf impact of dredging at the mouth might be on the circulation, flushing, and general water quality in the river. A hydrodynamic model was used to evaluate a series of four hypothetical dredging scenarios. Impact of Dredging the Lower Narrow River on Circulation and Flushing t�