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. However, there are 178 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 1.6 MGD. Use AssessmentAquatic LifeHabitat and FlowThe tide gates at the Route 139 dike restrict the natural flow/tidal flushing of this segment of the Green Harbor River. Although there is no evidence of tidal fluctuations or flow reversal, the lower portion of this segment is subject to saltwater intrusion at the dike. Marine macroalgae were also observed upstream from the dike (DeCesare 2005). The upstream extent of the salt water influence of this segment of the Green Harbor River is unknown at this time. The upstream passage of anadromous fish is almost completely inhibited because of the tide gates (Reback et al 2004). The tide gates have been at the Dike Street location since industrial revolution times. They consist of four separate gates that will only allow flow out. Currently the local conservation agent is working with CDM to develop a plan for partial opening in one of the gates. During a previous 4-year period one of the gates was in disrepair and would not fully close. In that 4-year period a herring run re-established itself into the upper portion of Green Harbor River (Wennemer 2005). Chemistry – waterDWM conducted water quality monitoring (DO and % saturation, temperature, pH, conductivity, alkalinity, hardness, chlorides, nitrate-nitrite nitrogen, ammonia-nitrogen and/or total phosphorus) in the Green Harbor River just upstream from the Route 139 dike, Marshfield (Station GH01), between June and October 2001 (Appendix A, Tables A6 and A7). In-situ measurements were also collected at this sampling location during the summer of 1996 (Appendix B, Table B2). The 2001 data are summarized below. Dissolved oxygen and percent saturation The DO ranged from 5.0 to 7.0 mg/L with saturations between 56 and 87% (n=5). These data represent both daytime and pre-dawn measurements. Temperature The maximum temperature was 34.4C. One of the five measurements was >28.3C. pH, hardness, and alkalinity The pH of the Green Harbor River ranged from 6.9 to 9.3 SU (n=6). Hardness ranged from 340 to 770 mg/L and alkalinity ranged from 25 to 52 mg/L (n=5). Conductivity Specific conductance was high ranging from 1,663 to 47,764 S/cm (n=4). The Aquatic Life Use for this segment of the Green Harbor River is assessed as impaired based on the flow regime alterations from the tide gate structure. These gates also prevent most of the anadromous fish migration. Primary and Secondary Contact RECREATION and AestheticsDWM conducted bacteria sampling (fecal coliform, E coli. and Enterococci) in this segment of the Green Harbor River just upstream from the Route 139 dike, Marshfield (Station GH01), between July and October 2001 (Appendix A, Table A7). Samples were also collected at this location during the summer of 1996 (Appendix B, Table B3). None of the fecal coliform bacteria counts exceeded 200 cfu/100 ml in either of the 2001 or 1996 surveys. Field observations were made by DWM personnel during the surveys conducted in the Green Harbor River between June and October 2001. Some foam and excessive algae growth and scums were noted in the river upstream from the Route 139 dike Sstation GH01; MassDEP 2001a). Recent observations made at various points along this segment (July 2005) indicate the water column was very turbid and brown in color and excessive growth of algae and duckweed were also present (DeCesare 2005). The Primary and Secondary Contact Recreational and Aesthetic uses for the Green Harbor River are assessed as impaired based on the aesthetically objectionable conditions including turbidity and excessive algal growth. Green Harbor River (MA94-10) Use Summary Table
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