1 / 14

Water Resources

Water Resources. Target Nitrogen loads will be achieved Flexibility for regional solutions Site constraints at Buck Island Site are adequately conditioned Flow neutrality outside of economic growth areas is demonstrated. Yarmouth Major Watersheds. Phase 1 - 418,000 Phase 2 - 393,500

tameka
Download Presentation

Water Resources

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Water Resources • Target Nitrogen loads will be achieved • Flexibility for regional solutions • Site constraints at Buck Island Site are adequately conditioned • Flow neutrality outside of economic growth areas is demonstrated

  2. Yarmouth Major Watersheds

  3. Phase 1 - 418,000 Phase 2 - 393,500 Phase 3 – 590,000 Phase 4 – 723,000 Phase 5 – 619,000 Total - 2.75 MGD

  4. Regionalization Barnstable • Potential sharing of treatment facilities • Regional assessment of R8 Hospital Bogs site for effluent disposal • Flexibility of Pump stations to accommodate future regional solutions

  5. Regionalization Dennis • MEP indicates nearly 100% of septic nitrogen load to upper-Bass River should be removed • Mid-Bass River is less nitrogen sensitive • Lower-Bass River appears to have more assimilative capacity • Bass River will be addressed in subsequent wastewater Planning effort

  6. Effluent Disposal CapacityBuck Island Site R1 Hydrogeologic Investigation and Groundwater Modeling • Indicates 0.99 to 1.5 MGD of infiltration capacity AveBOPeak • Phase 1 318,000 gpd 418,700 • Phase 2 628,000 gpd 812,200 1.0 MGD • Phase 3 1.1 MGD 1.40 MGD 1.8 MGD • CWMP proposes decreasing 4 ft separation to increase infiltration capacity.

  7. Parkers River Watershed

  8. Effluent Disposal Buck Island Site R1 Nitrogen Constraint MEP indicates 1.93 MGD at 3 ppm is the nitrogen loading constraint for Parkers River when Culvert is completed • CWMP Phase 1 and 2 will have lower flows with a limit of 7 ppm that operationally will approach 5 ppm. • Phase 3 modifications are proposed to achieve a maximum of 5 with an average to approach 3 ppm. • Additional Effluent Disposal Capacity will be required beyond Phase 3

  9. Interbasin Transfer of Nitrogen • Phase 1 as modified in the SEIR will have a no-net increase to the Greater Parkers River Seine Pond • The MEP required septic nitrogen decrease for the Seine Pond Sub-watershed is 59% • Seine Pond will receive 25% of effluent nitrogen for an additional 4kg/day at Phase 2 • Suggest expediting sewering in Seine Pond subwatershed from Phase 4 to Phase 1 or 2.

  10. Comprehensive Effluent Disposal • Effluent Disposal sites in lower and mid Bass River and Nantucket Sound Watersheds have less constraints from nitrogen loading perspective. • Additional Site investigation is required for future Phase and Bass River Planning effort

  11. Sewer Service Alternatives Maximize use of R1 site for nitrogen removal Long Pond • Groundwater flow and natural attenuation removes approximately 95% of the nitrogen Plashes Pond • Natural attenuation should be considered Nantucket Sound • No nitrogen limitation

  12. Growth Controls Yarmouth will be seeking 0% SRF Loan which requires flow-neutral controls • CWMP uses 16% for buildout + 5 % for additional economic development • Commission is working with Town to re-evaluate buildout and buildout flows

  13. Conclusion and Recommendations • Single EIR is sufficiently detailed to complete MEPA/Joint Review process • Subcommittee vote to approve staff report as comment letter to MEPA • Vote to authorize the Subcommittee Chair to sign a cover letter transmitting the staff report to MEPA on behalf of the Commission • Comment period closes 8/19/11

More Related