HomeMy WebLinkAboutMadaket-FishersLanding-Somerset_NantTownAssnPres_062816NANTUCKET WASTEWATER PLAN
UPDATE
Atheneum
Tuesday, June 28, 2016
Nantucket Town Association
•Current Status of Overall Wastewater Planning
–Comprehensive Wastewater Management Plan (CWMP) Update
–Surfside WWTF Improvements Project
–Sewer Extension Implementation Plan
•2016ATMApproved
–Nantucket Harbor Shimmo
–PLUS
•2016 Fall STM – Proposed
–Madaket/Warrens Landing & Somerset
–Estimated Project Costs
–Fall Special Town MeetingArticles
–NoActionAlternative
Agenda
1
ComprehensiveWastewaterManagementPlan
Update
•Incorporates Massachusetts Estuaries Program Results IntoRecommended Plan
–Nitrogen Reduction to Meet Total Maximum Daily Loads(TMDLs)
•Ranks “Areas of Need”
•Septage Management Solutions
–Board of Health Local Regulations
•Full Use of Surfside WWTF Permit - Flows
–Madaket WWTF Eliminated
•20-Year Planning Document
2
Structured Nitrogen Reducing Solutions
•Address all NeedsAreas With a Plan Defined as a Structured,Iterative Process andAdaptAs Necessary
–Sewer Expansion
•Aim to Reduce Nutrient Loading Over Time – Water QualityMonitoring Program
–Start With Plans That Give the Town the Biggest Bang for its Buck
•Add or Reduce Solutions as Needed to Meet EstablishedThresholds
–Hummock Pond Breach – Jetties Reconstruction
–Sesachacha Pond Breach
AdaptiveManagementPlantoMeetNitrogen
Reductions
3
Non-Structured Nitrogen Reducing Solutions
•Septage Management Plan
–Pumping Incentive
–Innovative/Alternative Systems
•Fertilizer Management
–Education and Enforcement of Local Regulations
•Stormwater Management
–Island-wide
AdaptiveManagementPlantoMeetNitrogen
Reductions
4
NitrogenPollutionFromLandUses
5
SepticSystemsandNitrogenPollutionImpacts
ALGAE BLOOMS
DYING EEL GRASS
WEED GROWTH
6
ComprehensiveWastewaterManagementPlan
UpdateFinalRecommendedPlan
7
SurfsideWWTFImprovementsProjectUpdate
•MassDEPApproved Expansion Up to 4.0 MGD
–SupportsAll NeedsAreas From CWMP Update
–NoAdditional Discharge Beds Needed
–Groundwater Discharge Permit – Monitors Water Quality Testing atTMDLLocations
•MassDEPApproved State Revolving Fund (SRF) Loan atZero Percent Interest – 20 Years
•Highest and Best Use of Surfside WWTF
–Madaket WWTF Eliminated
•Final Improvements Project Out to Bid Summer 2016
8
April2,2016ATMSewerImplementationPlan
Design&Constructionof
“NantucketHarborShimmo”and“PLUS”
•Two-Phase Sewer DesignApproved
–Phase 1 - Nantucket Harbor Shimmo (Formerly Called
Monomoy)
–Phase 2 - PLUS (LargerNeighborhoodIn-fillAreas
WithinorAdjacenttotheExistingTownSewerDistrict
10
2016TownMeetingSewerLocations
11
Approved ATM
Proposed STM
October17,2016 STMSewerImplementationPlan
Design&Constructionof
“Somerset”,“Madaket/WarrensLanding”
•Two-Phase Sewer DesignApproved
–Phase Somerset
–Phase 2 – Madaket / Warrens Landing
12
Phase1-Somerset
13
Phase2–Madaket/WarrensLanding
14
WhytheNeedtoSewer–NaturalResources
Department
Natural Resources Department
•Annual Water Quality Sampling Program
•Water Quality Issues
–Nitrogen Impact to Water Quality
•Total Maximum Daily Load
•Surfside WWTF Groundwater Discharge Permit
–Monitoring TMDLThrough Sampling
2
WhytheNeedtoSewer–BoardofHealth
•Inspection Results
–574 Total Septic Systems (69 Innovative /Alternative)
•422 Passed
•111 Failed
–85 Technical
–26 Hydraulic
2
WhytheNeedtoSewer–BoardofHealth
•Severe Soils
–Soils Percolate at Less than 5 Minutes Per Inch
•Too Fast – No Nitrogen Reduction in Bio-Mat (If a Bio Mat Can Even Form)
•Inadequately Cleansed Wastewater Enters the Groundwater - Pollution
•Severe Groundwater
–Extremely Shallow in MadaketArea
•On-Site systems Do Not Meet Regulatory Mandate for Separation From GW
•Records of 1.5 Feet of Separation inArea – Regulatory Standard is 6 Feet
•Alternatives
–Sewer – RemoveAll On-site Systems from Watershed
–I/ASystems Do Not Remove Enough Nutrients to Meet TMDL
–Tight Tanks – Last Resort Technology Governed by Title 5 – 315 CMR 15.00
•NeedApproval From MassDEP
•Logistically, technically and economically Not Feasible
2
OverallEstimatedProjectCosts–Finance
Department
Phase 1 – 2017 Cost Estimate
Somerset
–Design - $ 1,753,430.
–Construction - $15,780,867.
TOTAL $17,534,297.
Phase 2 – 2019 Cost Estimate
Madaket / Warrens Landing
–Design - $ 6,109,648.
–Construction – $54,986,828.
TOTAL $61,096,475.
14
EstimatedProjectCoststoTaxpayers–Finance
Department
17
UsingAverageAssessed Property Values, the following are theEstimatedAnnual Cost Impacts to the Taxpayers for EachProject:
•AverageAssessment of $1,784,378
–Somerset - $53.50
–Madaket / Warrens Landing - $186.40
•AverageAssessed Value of $1,144,544 Year Round Residential
–Somerset - $34.31
–Madaket / Warrens Landing - $119.56
2016FallSpecialTownMeeting–Town
Administration
•Two WarrantArticles:
–“Somerset” and “Madaket / Warrens Landing”
•Adding NeedsAreas Parcels to Town Sewer District
•Approve Design and Construction
•2016 STM Follow Up
–Ballot Questions to Follow
18
WhatIfWeChooseToDoNothing?
The Town has been issued TMDLs (a regulatory term in the
U.S. Clean Water Act, describing a value of the maximum amount of a
pollutant that a body of water can receive while still meeting water quality
standards for the subject estuaries)in Nantucket, Polpis and
Madaket Harbors, as well as Sesachacha Pond and has
an order pending in Hummock Pond.
If the Town chooses NOT to do anything, EPA
with MassDEP has the authority to issue orders
with fines to mandate restoration of the Town’s
waters under its own terms and conditions.
19
AndwhatWouldDoingNothingCostUs?
–We Will Lose SRF Funding
–Increased Construction Costs
–We Will Lose the Local Control of the Projects
–Administrative Consent Order Determines:
•When to Do the Project
•How to Do the Project
•How to Pay For the Project
20
Wastewater Plan Update
QUESTIONS &
ANSWERS
Wastewater Plan Update
BACK-UP SLIDES
Phase1SewerLocation
12
Phase2SewerLocation
13
Funding&Financing:CapitalRecoveryPlan
•SRF Loan at Zero Percent Interest
–Paid Over 30 Years
–Costs Savings
•$44.6M Over Life of Loan
15
ContributingAreastoWaters
NantucketHarborTMDLLocations
MadaketHarborTMDLLocation
Excerpt from Nantucket Harbor TMDL from MassDEP: