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)