Comprehensive Wastewater Management Planning (CWMP)

Project Update forEast Falmouth Watersheds

Board of Selectmen Progress MeetingOctober 22, 2007

Nathan C. Weeks, P.E.

Stearns & WhelerEnvironmental Engineers and Scientists

Presentation Outline

• Project Overview• Needs Assessment• Alternatives Screening Analysis • Next Steps• Questions and Discussion

This Project is One of the Many Town Wastewater and Nutrient

Management Projects

• Upgrade and Expansion of the Falmouth WWTF

• Many completed and on-going MEP Projects

• Sewer service to New Silver Beach Area• Sewer service to Falmouth High School

Project Planning

Area

Town-Wide Evaluation of Potential Treated Water Recharge Sites

Project Overview and General Need

Project Overview and

General Need(continued)

Four Main Components for the CWMP Project

• Phase 1, Needs Assessment• Phase 2, Alternatives Screening

Analysis• Phase 3, Detailed Evaluations and

Preparation of Draft Plan • Phase 4, Additional Evaluations and

Preparation of the Final Plan

Needs Assessment: Primary Findings

Needs Assessment: Additional Findings

• Existing Falmouth WWTF is operating well (3mg/l TN on average)

• Several institutional issues need to be addressed:–Growth management once sewer

extension begins (Growth Neutral Bylaw?)– Sewer connection policies– Funding and cost sharing

Alternatives Screening Analysis:

• Several Categories of Alternative Management Solutions– Expansion of the existing Falmouth

WWTF–A new WWTF–New treated water recharge site(s)–Decentralized wastewater management–Non-wastewater nitrogen management

Alternatives Screening Analysis:

• Expansion of the Existing Falmouth WWTF

Alternatives Screening Analysis:• Possible new WWTF at the Falmouth

Country Club Site

Alternatives Screening Analysis:• Possible new WWTF at the Otis AFB

Site

Alternatives Screening Analysis:• Possible new treated water recharge sites

Alternatives Screening Analysis:• Possible Otis WWTF Water Recharge Site

Alternatives Screening Analysis:

• Decentralized Wastewater Management Solutions• Individual

nitrogen removal systems

• Cluster systems

Alternatives Screening Analysis:

• Additional Non-Wastewater Nitrogen Management Solutions– Fertilizer management– Stormwater management–Pond inlet modifications/Increased tidal

flushing–Possible watershed modifications in

cranberry bogs

Development of 3 Major Alternatives Scenarios

• Alternative scenarios are combinations of:– Treatment sites–Recharge sites– Treatment technologies–Non-Wastewater nitrogen management

solutions

Alternatives Scenario No. 1

Alternatives Scenario No. 2

Alternatives Scenario No. 3

No Action Alternative• Water quality will decline

Next Steps

• Prepare and file an Environmental Notification Form (ENF) to initiate public review

• Proceed with detailed evaluations• Continue with public participation

program

Public Participation Items

• Meetings with NMG• Meetings with BOS and others• Website (Town-wide focus)• Project kiosk (table-top display) • Newsletters• Presentations as part of the

environmental review process

Timeline

Needs Assessment Report October 07

Alternatives Analysis Report October 07

Environmental Notification Form (ENF)

November 07

CWMP and Draft EIR May 08

CWMP and Final EIR November 08

Questions and Discussion