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R9 AD Park ViewDickensCollinsParkview Island 77 Street 72 Street Park View Canal, PVC PVC 76 Street Kayak Launch Parkview Island Parkview Canal Normandy Waterway E-W Normandy Waterway N-S Biscayne Point Waterway Tatum Waterway Atlantic Ocean North Biscayne Bay PVC has Limited Natural Flushing within an Impaired Biscayne Bay 81.3-acre catchment -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 0 500 1,000 1,500 6:00 12:00 18:00 Tide Elevation (feet NAVD88)Enterococci (MPN/ 100 mL)MPN 2022 MPN 2024 Tide Height 2022 Tide Height 2024 2024 2024 2022 2022 70 MPN/100 mL Enterococci values dropped significantly b/w storm events, suggesting ARVs and pipe lining have had a positive impact Time (October 18, 2022 and August 15, 2024) Lost evidence of groundwater source 2022: 6 53rd street (9/14/2022) 73rd street (9/14/2022) 21st street (9/22/2022) 73rd street (10/19/2022) Purdy Ave (11/22/2022) 21st street (12/1/2022) 2023: 4 53rd Street (1/25/2023) 79th Street (2/9/2023) 73rd Street (3/1/2023) South Pointe (10/4/2023) 2024: 3 73rd street (3/13/2024) 79th street (7/13/2024) 53rd Street (9/5/2024) 2025: 1 21st Street Collins Park (2/5/2025) Substantially reduced ‘no swimming advisories’ over the last several years. Advisories from FDOH Healthy Beaches Program: FUNDED WORK OPERATIONS CODE COMPLIANCE (SINCE MARCH 2025) •660 INSPECTIONS •112 WRITTEN VIOLATIONS STORMWATER CLEANING (SINCE MARCH 2025) •DOUBLE CLEANING (3x/yr to 3x/6 mo) HOMELESS OUTREACH •VISITS TWICE DAILY (DAY AND NIGHT SANITATION •VISITS TWICE DAILY (DAY AND NIGHT •ALLEYWAYS AND STREETS •MANGROVE SHORELINE UV DISINFECTION DOWNSTREAM DEFENDERS OUTREACH OPERATION CLEAN WATER ADDITIONAL SLIDES Understanding Regulatory/Guideline Levels Agency Purpose Single Sample Limits (MPN/100 mL) FDOH Recreational Beach Use 70 FDEP Class III (Recreation)130 US EPA Primary Contact 130 US EPA Kayaking turbulent water 164 US EPA Kayaking calm water 371 US EPA Fishing 391 Enterococci Marker Single Sample Limits (GC/100 mL) Human 525 Dog N/A Bird (Gull)200,000 MST (Research-based Guidelines for Recreational Beach Use) REGULATORY FOR BEACHES (NOT DESIGNED FOR CANAL) EPA GUIDELINE RESEARCH RECOMMENDED FOR BEACHES Extensive Investigation starting in 2020 Dye testing of sanitary gravity system, looking for interconnections with storm sewer Extensive sampling, and hot-spot analysis (inconclusive) Night flow isolation, camera inspections, manhole inspections, and smoke testing Notices of all 2021 smoke testing deficiencies found in private property ( broken cleanout, missing cleanout caps, broken laterals) are now being mailed out by DERM to advise the owners for repairs. Abandoned force main confirmation Extensive system cleaning Past Work by City - Public Works Infrastructure Repairs •Public Works crews executed critical repairs where deficiencies were identified •150 ft of 8-inch replaced in 2022 Sanitation Enhancements Added rain domes to the public trash bins to minimize leakage Increased the frequency of hand crew cleanings from once a week to twice a week. These crews clean debris from sidewalks, gutters, and the right of way. Increased the frequency of mechanical street sweeping on Parkview Island to twice per week. Increased the cleaning of public litter cans to twice day from once a day (7 days a week). Past Work by City - Public Works (continued) Short-Term Coordinating with DERM for installation of sanitary sewer manhole Smart Covers (minimize likelihood of 1/19/23 SSO) Gravity sewer trenchless rehabilitation at Parkview Island (lining about 90% of pipes and 30% of manholes) Sanitary sewer PS 23 Maintenance 18 ARV replacements along Sewer PS 23 and PS 24 Sanitary sewer PS 19 discharge force main replacement Additional testing: dye test of sanitary sewer pressure pipes Planned and Proposed Future Work Mid-Term: 1 -3 years Budget requested to design and construct water quality systems for existing major stormwater outfalls Trenchless rehabilitation of gravity sanitary sewer beyond Parkview Island Long-Term: 3+ years Applied to multiple grants, including one for living shoreline improvements at the Parkview Island Park area. $10 M grant agreement executed for design of North Shore D improvements: New stormwater conveyance, New water quality treatment (including trash racks, vortex separator, and injection wells to capture 1st flush) New pump station and outfall Planned and Proposed Future Work (continued) More than 300 tons of debris captured annually Entire system is cleaned yearly & high priority areas are cleaned more frequently – More than 5 times what is required by NPDES Citywide Stormwater Cleaning for Litter, Debris, and Sediment Above-ground Walk-Throughs Departments: Environment & Sustainability, Public Works (Infrastructure, Engineering, and Sanitation Divisions), Communications, Code Compliance, Homeless Outreach & Police Department Homeless individuals in Parkview Park and under the 73rd Street bridge. Continued outreach- began the relocation process and provided them with assistance. Dead chickens under the kayak launch were removed. A wildlife feeding area sign was removed. Changed the open-top bins to covered bins to prevent overflow or seepage. A restaurant with an overflowing dumpster near inlets and catch basins was cited. Enterococci elevated in PVC Improved but still elevated 92% exceed 70% exceedSewage Spill 70 70 CMB Surfrider Water Quality Study No data prior Before During After * ********* * Enterococci elevated in PVC Improved but still elevated CMB Surfrider 70 70 92% exceed 70% exceedSewage SpillWater Quality Study No data prior Before During After Kayak Guideline * ********* Considering Kayaking Guidelines (yellow)Kayak Guideline CMB Surfrider Before During After * ********* * 370 370 56% exceed 20% exceed Still elevated above 370, but closer for intended use Groundwater Stormwater PVC Water Results of Enterococci in Groundwater Enterococci Levels in Street Runoff going into Stormwater System are much higher than Groundwater Enterococci in PVC water Wa Charts below compare the different samples by water type and depth within PVC UMiami Samples (Enterococci only) All Water Types PVC only Kayak Launch Comparison to other urban environments.Median is in range/ below available study literature Environment Location Enterococci Median (MPN/100 mL) Roof runoff Miami, FL 1,200 Canals impacted by stormwater New Orleans, LA 4,300 Norfolk, VA 1,200 PVC 300 Stormwater (from street)Houston, TX 10,100 Raleigh, NC 12,300 PVC 20,000 Microbial Source Tracking MST PVC water shows evidence of bird (a lot), some dog and some human Microbe Level (MPN or gc/100 mL) Groundwater shows evidence of bird (due to stormwater and PVC mixing) but no dog and one with very low human Microbe Level (MPN or gc/100 mL)MST markers 525, human threshold Stormwater showed highest levels of enterococci, dog, and human markers Microbe Level (MPN or gc/100 mL) MST Marker Distribution G: Groundwater S: Storm C: Canal PVC: Kayak Launch Sample Label MST sample distribution Area of human detects at street surface Conclusions Enterococci levels lower between storm events (lost earlier signal of possible sewer leaks). Sanitary sewer pipe-lining and repair of air release valves appears to have improved water quality between storms Main water type contributing to enterococci in the PVC is stormwater Source to stormwater comes from birds, humans, and dogs from street runoff Additional load from birds within the PVC BBE outfall contributes enterococci to the PVC Recommendations Stormwater Outfalls: Address outfall at Biscayne Beach Elementary. Miami-Dade should investigate private outfalls contributing to PVC. Street Sweeping: Increase frequency on east side of catchment. Improve street sweeping access (add smaller units). Cleanliness of Public Spaces: Deep clean grassy areas and surfaces with visible animal waste. Explore UV disinfection. Pet Waste: Continue public education campaign. More pet waste stations. Deep clean up of pet waste. Address Homeless Sanitation Practices and Needs: Explore ways to improve access to sanitation. Birds: Evaluate what is attracting birds to PVC and throughout catchment Stormwater Groundwater Community Complex Resilient Grant Groundwater Continue with aggressive inspection and maintenance of sanitary sewer PVC Implement water quality treatment for stormwater outfall improvements Improve PVC flushing (in design and permitting phase) Improve shoreline to reduce erosion and trash (federally funded living shoreline) Consider EPA kayaking guideline (370 MPN/100 mL) coupled with a weather based pre-emptive closure Thank you! Next steps Release report to general public in March. Integrate feedback from public into report.