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WASTE DISCHARGE REQUIREMENTS - 2 - <br /> DEFENSE <br /> 2 -DEFENSE DISTRIBUTION REGION WEST SHARPE <br /> INTERIM GROUND WATER CLEANUP SYSTEM <br /> SAN JOAQUIN COUNTY <br /> 5. The current treatment system (North and South Balloon areas) consists of two separate ground <br /> water extraction systems, individual air stripping towers and effluent piping to the outfall structure. <br /> A polyphosphate compound is added, in very low concentrations, to the extracted ground water <br /> prior to treatment to reduce scaling in the air strippers. The Report of Waste Discharge describes <br /> the effluent as follows: <br /> Monthly Average Flow: 0.576 million gallons per day (mgd) <br /> Design Flow 1.152 mgd <br /> Average Temperature: 21.5 'C summer; 20°C winter <br /> Constituent Constituent <br /> Nitrate 0.027 mg/l Beryllium 20.0 µg/1 <br /> Sulfate 42.0µg/1 Chromium (total) 80.0µg/1 <br /> Iron 800.0µg/1 Copper 20.0 4g/1 <br /> Magnesium 67.0 mg/1 Selenium < 3.0µg/1 <br /> Arsenic 48.0 4g/1 Thallium < 100.0 4g/1 <br /> Zinc 60.0µg/1 <br /> 6. Recent monitoring indicates' the effluent at the outfall from the North and South Balloon facilities <br /> as follows: (some values reported are the averages for the detectable concentrations) <br /> Monthly Average Flow: 0.646 million gallons per day (mgd) <br /> Constituent ug/I Constituent <br /> Aluminum 105.0 Antimony < 53.0 <br /> Arsenic 19.5 Barium 161 <br /> Beryllium I Cadmium 1 <br /> Chromium (total) 8 Copper 20.9 <br /> Iron 116 Lead < 1 <br /> Mercury < 1 Nickel 20.5 <br /> PCBs < 0.065 Selenium < 5 <br /> Silver < 4 Thallium < 53 <br /> Vanadium 28.9 Zinc 30.7 <br /> Volatile Organics NDZ <br /> ' Calculated as an average for the months of April 1993 through March 1994 <br /> z ND =Non-detect per EPA methods 601/602, there was only one detection during the <br /> 12-month period <br />