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water and unused fertilizer onto the course instead of discharging into Briggs Harbor.

¾ Evaluate feasibility of effluent reuse as part of the NPDES permit renewal process to reduce discharge into Cohasset Cove.

Little Harbor:

¾ The Town of Cohasset should complete the Wastewater Facilities Plan Supplement and implement its recommendations for community sewerage treatment in the Little Harbor and Atlantic Avenue area as required in the DEP Amended Final Judgment.

¾ Monitor bacteria levels to document effectiveness of bacteria source reduction activities associated with the Phase II community stormwater management program and to assess the status of the Primary and Secondary Contact Recreational uses.

¾ Implement Little Harbor TMDL recommendations (see http://www.mass.gov/dep/brp/wm/files/litlharb.doc

Scituate Harbor:

¾ The Stellwagen Bank National Marine Sanctuary should hook up to sewer as planned during fall of 2006.

¾ Bacteria sampling at the Scituate Light Beach should be conducted in accordance with the 2001 Massachusetts “Beaches Bill”. These data should be reported to MDPH for inclusion in their annual reports.

¾ Minimize direct fish waste runoff into the harbor when fish and fish products are loaded and unloaded from commercial fishing vessels.

3.0 Aquatic Habitat Impairments

3.1 Invasive Species Impacts

Lily Pond is a Class A public water supply and the primary source for Cohasset. The Cohasset Water Treatment Plant (MAG640070) has two lagoons for backwash and the supernatant goes into Lily Pond. Chlorine is used in the process but is not added to the supernatant. The Town of Cohasset has received numerous grant awards to assess and implement improvements to water quality. A multiphase project has been funded to improve water distribution system and source water improvements. Three nonnative aquatic plants were documented by ENSR in 2002 - fanwort (Cabomba caroliniana), variable watermilfoil (Myriopyllum heterophyllum) and curly-leaved pondweed (Potamogeton crispus) (ENSR 2003, Appendix F DCR Lakes & Ponds Grant for Lily Pond FY 2002). Two grant projects, a 319 grant project and a Clean Water SRF Loan will fund the design and installation of BMP stormwater control devices and Low Impact Development urban retrofit strategies wherever possible to contain and minimize off-site flows and pollutant loading in the Peppermint Brook subwatershed. In 2000 Cohasset extended its sewer system to include over 750 houses in the vicinity of Peppermint Brook (Lefebvre et al. 2003). Anticipated pollutant load removal is 658 kg/yr of nitrogen and 22 kg/yr of phosphorus. Secchi disc tests done to measure turbidity in the water (a black and white disk is lowered and the depth where the distinction between black and white is no longer discernable is measured) reported that visibility was lost at less than 4 inches during three surveys completed in 2002 (ENSR 2003). The Recreational and Aesthetic uses are assessed as impaired because of the high biovolume of non-

South Coastal Watershed Action Plan 9/12/2006 Watershed Action Alliance


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