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HomeMy WebLinkAboutWastewater Action Plan August 10, 2011 Presentation_201401230916467450COMMITMENT &INTEGRITY DRIVE RESULTSTown of Nantucket Sewer Action PlanMassachusetts Estuaries Program UpdateWorkshop Number 3 PresentationAugust 10, 2011 COMMITMENT &INTEGRITY DRIVE RESULTSWastewater Action Planning Project TeamWoodard & CurranJohn L. Daniels. Client ManagerTom Hazlett, P.E, Project ManagerRosemary Blacquier, Technical/Planning SpecialistPaul Dombrowski, WWTF SpecialistTown of NantucketBoard of SelectmenTown AdministrationDepartment of Public WorksBoard of HealthMarine and Coastal Resources DepartmentMassachusetts Department of Environmental ProtectionSchool of Marine Science and Technology Massachusetts Estuaries Reports (MEP)▀ Nantucket Harbor – Completed▀ Total Maximum Daily Load (TMDL) Established▀ Based on MEP Thresholds▀ Sesachacha Pond – Completed▀ TMDL Established▀ Based on MEP Thresholds▀ Madaket Harbor / Long Pond – Completed▀ TMDL In Process – Thresholds Established▀ Draft Report Released▀ Public Hearing Nantucket Harbor MEP Nantucket Harbor Delineations Nantucket Harbor Estuary System Nitrogen Load Model of Nantucket Harbor – Brant Point Tide Rotation Nantucket Harbor Total Nitrogen Concentrations – MEP Report Nantucket Harbor MEP Nantucket Harbor Nitrogen Load Rates, Thresholds and TargetsEmbayments Present Watershed Load kg/day Target Threshold Watershed Load kg/day DifferenceHead of Harbor 1.86 0.79 1.07Quaise Basin 2.12 1.14 0.98Town Basin 12.22 10.71 1.51Polpis Harbor 3.52 2.18 1.34Total19.72 kg/day14.89 kg/day4.9 kg/day Nantucket Harbor Septic ThresholdsMEP REPORT THRESHOLDS – SEPTIC LOADS Final MEP Recommendations▀ 2004 CWMP Update to Incorporate▀ Nantucket Harbor TMDL▀ Plan to Meet Thresholds▀ Sesachacha Pond TMDL▀ Plan to Meet Thresholds▀ Madaket Harbor / Long Pond TMDL▀ Once Completed, Plan to Meet Thresholds What’s Next?▀ Incorporate the MEP Supplemental Data to CWMP Update▀ Review Soon to be Released Madaket Harbor and Long Pond TMDL From MEP▀ Develop Plans to Meet Thresholds – Incorporate in CWMP update Questions and AnswersMassachusetts Estuaries Program Update Supplemental SlidesMassachusetts Estuaries Program Update • Back Up SlidesTYPICAL ON-SITE HARBOR WATERSHED WASTEWATER DISPOSAL SYSTEM Nantucket Harbor MEP Sesachacha Pond MEP Sesachacha Pond Estuary System Nitrogen Load Sesachacha Pond TMDL Madaket Harbor MEP Madaket Harbor Estuary System Nitrogen Load Madaket Harbor and Long Pond ThresholdsMadaket Harbor and Long Pond TMDL - TBD CWMP Needs Areas Matrix CWMP Needs Areas Matrix CWMP Needs Areas Matrix Monomoy Build Out AnalysisMonomoy Build Out Analysis Prepared by Nantucket Planning Office Revised Feb 16, 2011 1 Unit 2 Unit 3 or more Units Total Units Existing Dwelling 44 120 14 178 Flow @ 385 = 16,940 g/d @ 605 = 72,600 g/d @ 715 = 10,010 g/d 99,550 g/d Future Dwelling 44 56 0 100 Flow * = 9,680 g/d ** = 30,800 g/d0 g/d 40,480 g/d Total 88 26,620 g/d 176 103,400g/d 14 10,010 g/d 278 140,030 g/d Key: g/d= gallons per day  * 44 second dwellings on existing lots @ 220/unit = 9,680 g/d  ** 36 units 16 vacant lots; 20 units on newly created lots: @ 550/unit = 30,800 g/d  Flow based on 110 gallons per bedroom per day  1 unit assumed at 3.5 bedrooms  2 units assumed at 2 bedrooms Shimmo Build Out AnalysisShimmo Build Out Analysis Prepared by Nantucket Planning Office Revised Feb 16, 2011 1 Unit 2 Unit 3 or more Units Total Units Existing Dwelling 76 112 28 216 Flow @ 385 = 29,260 g/d @ 605 = 67,760 g/d @ 715 = 20,020 g/d 117,040 g/d Future Dwelling 67 118 0 185 Flow * = 14,740 g/d ** = 64,900 g/d0 g/d 79,640 g/d Total 143 44,000 g/d 230 132,660 g/d 28 20,020 g/d 401 196,680 g/d Key: g/d = gallons per day  * 67 second dwellings on accessory lots @ 220/unit = 14,740 g/d  ** 34 units 17 vacant lots: @ 550/unit =18,700 g/d 84 units on newly created lots: @ 550/unit = 46,200 g/d Total = 64,900 g/d  Flow based on 110 gallons per bedroom per day  1 unit assumed at 3.5 bedrooms  2 units assumed at 2 bedrooms Nantucket Groundwater Flow Directions Atmospheric Deposition (USEPA) Benthic Flux Sample (USGS)