The goal of the Clean Water Act (cwa) is to restore and maintain the chemical, physical, and biological integrity of the Nation’s waters
WMA water withdrawal Summary (APPENDIX E, TABLE E5)
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WMA water withdrawal Summary (APPENDIX E, TABLE E5)
*System-wide withdrawal, all sources are not necessarily within this segment. Additionally, there are 11 acres of cranberry bog open space in this subwatershed, inclusive but not limited to WMA registered growers (UMass Amherst 1999). For the purpose of this report, a conservative estimate of water use for this bog area is approximately 0.10 MGD. NPDES wastewater discharge summaryThere are no NPDES wastewater discharges into this segment. Use AssessmentAquatic LifeHabitat and FlowThere are no barriers to fish migration along this segment of the Bluefish River. There is a wooden notched weir-pool fishway in the unnamed tributary (locally known as the Bluefish River) at the Armory Dam south of the Harrison Street Bridge in Duxbury (Reback et al. 2004). BiologyAccording to DMF the Bluefish River is an important shellfish area, supporting both recreational and commercial soft shelled clam (Mya arenaria), razor clam (Enis directus) and blue mussel (Mytilus edulis) fisheries along the inter-tidal and immediate sub-tidal areas as well as quahogs (Mercenaria mercenaria) in lesser abundance on the hard bottom near the mouth of the river (Churchill 2003c). Chemistry – waterDWM conducted water quality monitoring (DO and % saturation, temperature, pH, conductivity, alkalinity, hardness, and chlorides) in the Bluefish River at the Washington Street Bridge, Duxbury (Station BR101), between June and October 2001 (Appendix A, Tables A6 and A7). Water quality samples were also collected from the tributary to the river (locally known as the part of the Bluefish River) at the Harrison Street Bridge, Duxbury (Station BR102). Dissolved oxygen and percent saturation The DO in the Bluefish River near the Washington Street Bridge ranged from 5.4 to 7.1 mg/L with saturations between 73 and 87% (n=6). These data represent both daytime and pre-dawn measurements. Only one of the six in-situ measurements was less than 6.0 mg/L and 75% saturation. Temperature The maximum temperature was 21.5C. pH, hardness, and alkalinity The pH of the river ranged from 7.6 to 7.8 SU (n=6). Hardness ranged from 4700 to 5200 mg/L and alkalinity ranged from 92 to 100 mg/L (n=4). Conductivity Specific conductance ranged from 41,585 to 47,638 S/cm (n=6). The Aquatic Life Use is assessed as support for the Bluefish River based primarily on the in-situ water quality data. SHELLFISH HARVESTINGThe DMF Shellfish Status Report of July 2000 indicates that Area CCB46.5 (which contains 0.02mi2 of this segment) is prohibited and Area CCB46.2 (which contains 0.04 mi2 of this segment) is conditionally approved (MA DFG 2000 and Appendix G, Table G3). Based on the DMF shellfish growing area status, the Shellfish Harvesting Use is assessed as impaired due to elevated fecal coliform bacteria counts. It should be noted that three septic system pollution sources were eliminated since they have connected to the town sewer system (MA BAYS undated and Churchill 2003c). This project received an innovation award from the Massachusetts Municipal Association (MMA) in 1996 (Duxbury 1996). Although the current sources are unknown, discharges from municipal separate storm sewers are still suspected sources of bacteria. Primary and Secondary Contact RECREATION and AestheticsDWM conducted bacteria sampling (fecal coliform, E coli. and Enterococci) in the Bluefish River between July and October 2001 (Appendix A, Table A7) at the Washington Street Bridge, Duxbury (Station BR101). None of the fecal coliform bacteria samples exceeded 45 cfu/100 ml. Fecal coliform bacteria samples collected from the tributary to the river (locally known as the part of the Bluefish River) at the Harrison Street Bridge, Duxbury (Station BR102), were higher (ranging from 120 to an estimated 1000 cfu/100 ml). Field observations were made by DWM personnel during the surveys conducted in the Bluefish River between June and October 2001. No objectionable conditions other than a slight oily/dusty sheen on one sampling occasion were noted (Station BR101; MassDEP 2001a). The Primary and Secondary Contact Recreational and Aesthetic uses for the Bluefish River are assessed as support based on the fecal coliform bacteria data and the lack of aesthetically objectionable conditions. Bluefish River (MA94-30) Use Summary Table
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