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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- NPDES wastewater discharge summary (APPENDIX E, TABLE E1)
- Use Assessment
- Primary and Secondary Contact RECREATION and Aesthetics
WMA water withdrawal Summary (APPENDIX E, TABLE E5)
*System-wide withdrawal, all sources are not necessarily within this segment. NPDES wastewater discharge summary (APPENDIX E, TABLE E1)Broadway Water Treatment Plant in Hanover is permitted (MAG640063) to discharge supernatant from their water treatment facility to wetlands and then to Iron Mine Brook. Backwash is typically discharged to a receiving basin and the supernatant discharged to the ground, however. Use AssessmentAquatic LifeChemistry – waterDWM conducted water quality monitoring (DO and % saturation, temperature, pH, conductivity, alkalinity, hardness, chlorides, nitrate-nitrite-nitrogen, ammonia-nitrogen and/or total phosphorus) in Iron Mine Brook Elm Street crossing, Hanover (Station IM101), between June and October 2001 (Appendix A, Tables A6 and A7). These data are summarized below. Dissolved oxygen and percent saturation The DO ranged from 7.3 to 8.7 mg/L with saturations between 69 and 91%. These data represent both daytime and pre-dawn measurements. Temperature The maximum temperature in Iron Mine Brook was 20.4C. pH, hardness, and alkalinity The pH of Iron Mine Brook ranged from 6.7 to 7.0 SU (n=7). Hardness ranged from 65 to 90 mg/L while alkalinity ranged from 27 to 38 mg/L (n=4). Conductivity Specific conductance ranged from 458 to 763 S/cm (n=6). Ammonia-nitrogen No detectable concentrations of ammonia-nitrogen (exclusive of qualified data) were found in Iron Mine Brook. Total phosphorus With the exception of one very high measurement (0.16 mg/L), the total phosphorus concentrations measured in samples collected from Iron Mine Brook ranged from 0.024 to 0.064 mg/L. The Aquatic Life Use for Iron Mine Brook is assessed as support based primarily on the in-situ water quality data. This use is identified with an Alert Status, however, because of the very high total phosphorus measurement. Primary and Secondary Contact RECREATION and AestheticsDWM conducted bacteria sampling (fecal coliform, E coli. and Enterococci) in Iron Mine Brook Elm Street crossing, Hanover (Station IM101), between July and October 2001 (Appendix A, Table A7). The three fecal coliform bacteria samples collected during the primary contact recreational season (1 April to 15 October) ranged from 280 to 540 cfu/100 ml. The geometric mean of all four fecal coliform bacteria counts was 444 cfu/100 ml. With the exception of a small amount trash near the roadside on one occasion, no other objectionable odors, deposits or any other conditions were observed by DWM personnel near the Elm Street crossing, Hanover (Station IM101), during the surveys conducted in Iron Mine Brook between June and October 2001 (MassDEP 2001a). The Primary Contact Recreational Use for Iron Mine Brook is assessed as impaired because of elevated fecal coliform bacteria counts. Although the source(s) are currently unknown, elevated counts were found during both dry and wet weather sampling conditions. Suspected sources include discharges from municipal separate storm sewer systems. Both the Secondary Contact Recreational and Aesthetic uses are assessed as support, however, based on the limited fecal coliform bacteria data and the lack of aesthetically objectionable conditions. Iron Mine Brook (MA94-24) Use Summary Table
* Alert Status issues identified, see use assessment section Directory: eea -> docs -> dep -> water -> resources -> 71wqar09 dep -> Charles D. Baker Governor dep -> Charles D. Baker Governor dep -> Charles D. Baker Governor dep -> Index of Photographs dep -> Department of environmental protection one winter street, boston, ma 02108 617-292-5500 water -> Water Resource Management Planning 71wqar09 -> 2004 water quality assessment report Download 3.32 Mb. Share with your friends:
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