SITE INFORMATION AND CORRESPONDENCE_1993-2003

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INFORMATION SHEET 20 WASTE DISCHARGE REQUIRMENTS ORDER NO. R5-2002-0213 U.S. DEPARTMENT OF DEFENSE DEFENSE LOGISTICS AGENCY DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE GROUNDWATER REMEDIATION SYSTEM SAN JOAQUIN COUNTY aluminum in the final effluent are less than 200 gg/L (ppb). The Basin Plan does not provide a numeric water quality objective for aluminum. However, the USEPA has recommended, as freshwater ambient water quality criteria for aluminum, a CCC of 87 gg/L (ppb) and a CMC of 750 µg/L (ppb) expressed in terms of total recoverable metal in the water column. Given that toxic conditions have been identified in French Camp Slough, and concentrations of aluminum exceeding USEPA recommended criteria have routinely been identified in French Camp Slough and the SSJID Canal, this Order requires acute toxicity monitoring of the effluent and chronic toxicity monitoring of the effluent and receiving water to ensure the discharge is not contributing additional toxicity to the receiving waters. This Order also requires the Discharger to collect additional effluent data for aluminum of sufficient quality for comparison with appropriate water quality criteria. This Order may be re-opened if data indicate the effluent is contributing toxicity, or if concentrations of aluminum are or may be discharged at a level which will cause or have the reasonable potential to cause or contribute to an in-stream excursion above the USEPA aquatic life ambient water quality criteria. Pesticides The pesticide Bromacil has been detected in the effluent of the three GWTPs at maximum concentrations of 5.2 Ag/L (ppb) (North Balloon GWTP, 8/4/1998), 4.1 99/L (ppb) (Central Area GWTP, 8/7/2001), and 7.6 gg/L (ppb) (South Balloon GWTP, 8/8/2000). The Basin Plan does include an objective for Pesticides, stating in part; • No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses • Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses • Pesticide concentrations shall not exceed those allowable by applicable antidegradation policies • Pesticide concentrations shall not exceed the lowest levels technically and economically achievable The Basin Plan includes a narrative Toxicity objective which states, in part, that:All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human,plant, animal, or aquatic life. With regard to applicable water quality criteria, no MCL has been established for Bromacil. The USEPA has published a drinking water health advisory, or Suggested No-Adverse Response Level (SNARL) of 90 gg/L (ppb). This Order requires continued effluent and receiving water monitoring for Bromacil.