East Hampton Comprehensive Wastewater Management Plan. October 14, 2014

Transcription

1 East Hampton Comprehensive Wastewater Management Plan October 14, 2014

2 Project Reports Proposed Master Plan Public Discussion Just a Study Revised Comprehensive Plan Obvious improvements of neighborhood Systems Watershed Studies to Define Nitrogen & Phosphorus Removal Requirements Demonstration Projects of Low Cost State of the Art N & P Removal Techniques Improved Regulations & Enforcement Implementation Plan Legal Structure Financing Schedule Project Advisory Committee Final Comprehensive Plan Adoption by Town Board

3 PROJECT REPORTS Available from 1. Community Profile 2. Wastewater Needs Analysis 3. Solutions Scenarios Development 4. Wastewater Management Alternatives 5. Financial Alternatives and User Charges 6. Management & Legislative Alternatives 7. Scavenger Waste Facility 8. Lot by Lot Analysis 9. Water Quality Monitoring outline Draft 10. Preferred Plan To be finalized after public 11. Financing & Permitting of Preferred Plan meetings & Town Board actions

4 Nitrogen, Phosphorus & Bacterial Discharges from Septic Systems (Adopted from USEPA, 2013) N ~ 9 lbs/person-yr P ~ lbs /person-yr Bacteria OK if LP 2 ft above GW Phosphorus Load to Septic Tank 2.2 lbs/person/year Concentration 5 +/- mg/l Too much Nitrogen / Phosphorus causes excessive / toxic levels ofalgae & ecological decline Phosphorus Load at Discharge < lbs/person/year Min. 2 feet for bacterial purification need to consider sea level rise

5 Wastewater Management Needs Category 1. Nitrogen and Phosphorus TMDL 2. Bacterial contamination 3. Impermeable/Hydric Soils 4. Malfunctioning systems considerations 5. Septic Setback requirements 6. Private water supply considerations 7. Public water supply considerations 8. Town & County Code & State Law considerations Property serving 20+ people w/cesspool SPDES >1,000-gpd 9. Cost Considerations 10. Economic sustainability issues 11. Insufficient Space availability Description Reductions needed to restore water quality Lack of min. 2 ft separation between LP & GW Bad soils - usual bacterial contamination / septic malfunction Excessive pumping / breakout / plumbing backup Minimum of 200 feet from the surface waters Lack of req'd min. 100 ft separation between well & septic Too close to well Illegal by Federal law since 2000 Denitrification treatment may be required - Suit pending Denitrification may be required. Off-site may be less expensive than on-site Support community Site may have insufficient space for require treatment system

6 Montauk Study Areas Docks Camp Hero Fire Dept. Area Ditch Plains Montauk Center

7 Scientific Findings for Montauk South Lake Montauk Bacterial Water Quality Problems Bathing Ban - Ditch Plains properties & High groundwater Montauk Center - Wastewater Malfunctioning Lots Too Small Docks - High groundwater Miscellaneous Individual Systems- High Groundwater

8 Engineering Options for Montauk Ditch Plains Community System Montauk Center Community System Docks Localized treatment & disposal multiple site options exist. Individual Docks Centralized location (Fire Dept. area) for 1 or more study areas with potential for golf course effluent reuse as done at Pebble Beach & other courses Miscellaneous Individual Systems Individual on-site upgrades

9 1. Collection 70 +/- % of cost of wastewater system 50 % cost savings are achievable with the alternative collection system septic tank effluent/ Locally validated cost savings Important to be off roads to minimize costs 2. Treatment State of the Art, Highest levels of nitrogen removal proposed Below ground Solutions Odor proactively addressed. Air tight units with air collection & purification Low maintenance, can treat emerging for emerging contaminants / pharmaceuticals

10 Solutions 3. Disposal / Reuse (reduce irrigation & fertilizer requirements) Drip Irrigation at ballfields Golf course potential with centralized option

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12 Can be a mixture of gravity & pressure connections

13 SEPTIC TANKS & GREASE TRAPS IN PARKING LOT in FRONT OF RESTAURANTS & RETAIL ESTABLISHMENTS

14 Water & air tightness of the installation with dual manhole covers

15 Wastewater System Below Parking Lot Mashpee, MA Drainfield Pump Station BIOFILTER DRAINFIELD PUMP STATION BioFilter SEPTIC TANK NITREX FILTER DENITE FILTER DENITE Nitrex TM FILTER Filter Mashpee, MA Wastewater System at Completion

16 Malibu, CA Village Plaza Wastewater Treatment System Inside fence part of treatment unit will be underground 20+ Retail and restaurants connections Effluent Total N = 2 +/- mg/l Treats for pharmaceuticals & Emerging Contaminants. Low maintenance required

17 Town Owned Lands in Montauk Center

18 State lands potential for Ditch Plains

19 Additional Sites Other site options exist

20 Project Capital Costs Montauk Center Ditch Plains Docks $ 15.6 million $ 10.6 million $ 18.1 million

21 Potential Neighborhood Wastewater Systems and Comparison to Comparable Systems Individual Systems are potentially possible for some Docks properties site specific based upon grandfathered flows and site conditions

22 Financing Options Environmental Facilities Corporation Low interest loans exist and grants being discussed County Grants through the County s wastewater fund (part of the 1/4% sales tax program) Establish local water quality improvement districts Town funding thru use of SWF funds Community Preservation Funds use for wastewater improvements being discussed Others?

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24 Townwide

25 Community needs to discuss and decide on preferred solutions & financing techniques. Many options exist. This is the beginning of the process

26 Groundwater Travel Times & Watershed Boundaries Visual Examples of Environmental & Parcel Information

27 Properties with insufficient space with most liberal variances

28 Questions - Discussion Thank you questions or comments to Pio Lombardo, P.E. at: Pio@LombardoAssociates.com and / or Kimberley Shaw, Director of Natural Resources KShaw@ehamptonny.gov

29 TREATMENT PLANT