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INFORMATION SHEET • • ]6 <br /> WASTE DISCHARGE REQUIRMENTS ORDER NO. R5-2002-0213 <br /> U.S. DEPARTMENT OF DEFENSE <br /> DEFENSE LOGISTICS AGENCY <br /> DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN <br /> SHARPE GROUNDWATER REMEDIATION SYSTEM <br /> SAN JOAQUIN COUNTY <br /> have been less than the analytical reporting limit of 3 9g/L (ppb). For purposes of the reasonable <br /> potential analysis, and as summarized in Attachment C, the CMC and CCC aquatic life criteria of <br /> 40 CFR 131.38 were adjusted based upon the minimum observed hardness of the SSJID Canal (28 <br /> mg/L (ppm)). The adjusted CMC and CCC are 16.2 gg/L (ppb) and 0.63 gg/L (ppb) respectively. <br /> Considering the Reporting Limits (RLs) utilized by the Discharger, existing data are not of <br /> sufficient quality for comparison with the adjusted CCC criterion, and a determination of whether <br /> reasonable potential exists cannot be made. The data indicate that final effluent from the three <br /> GWTPs does not have the reasonable potential to exceed the adjusted CMC. <br /> At times, the effluent from the DDJC Sharpe facility may constitute the majority or entire flow of <br /> water in the SSJID Canal. Pursuant to Section 1.3 of the SIP, when the observed maximum <br /> ambient background concentration exceeds a criterion, an effluent limitation is required. Results <br /> of monitoring in French Camp Slough indicate two instances where concentrations of total lead <br /> were detected. On 7 July 1998, and on 13 July 1999, total lead concentrations in French Camp <br /> Slough were reported as 3.0 gg/L (ppb ). The hardness of French Camp Slough was also <br /> monitored on 13 July 1999, and was reported as 100 mg/L (ppm) as CaCO3. Considering that at <br /> 100 mg/L hardness as CaCO3 the adjusted CCC criterion for total lead is 3.2 µg/L (ppb)), the data <br /> indicate that the observed maximum background concentration did not exceed the CCC for total <br /> lead. <br /> Based upon the results of effluent and receiving water monitoring, there is insufficient information <br /> to determine whether the discharge from the DDJC-Sharpe facility does or does not not have the <br /> reasonable potential to exceed the adjusted CCC criterion for lead. This Order requires the <br /> Discharger to collect additional effluent and receiving water data for lead of sufficient quality for <br /> comparison with appropriate criteria. This Order may be may be re-opened if the data indicate <br /> concentrations of lead are or may be discharged at a level which will cause or have the reasonable <br /> potential to cause or contribute to an in-stream excursion above the appropriate criteria. This <br /> Order retains the weekly average effluent limitation for total lead of 3.2 µg/L (ppb) from the <br /> previous Order as an interim limitation pending collection of new data. <br /> Mercury <br /> Previous Order No. 95-258 included a monthly median effluent concentration limitation for <br /> mercury of 0.012 µg/L (ppb). The Basin Plan does not provide a numeric water quality objective <br /> for mercury. The current USEPA water quality criteria for mercury, for protection of human <br /> health for consumption of both water and organisms, is 0.050 µg/1. The USEPA is currently <br /> reviewing the ambient water quality criteria for mercury and may recommend more stringent <br /> criteria, based in part on organism uptake and bioaccumulation. The Delta has been listed as an <br /> impaired water body pursuant to Section 303(d) of the Clean Water Act for mercury, based on fish <br /> tissue concentration and not water column toxicity. The California DHS has issued health <br /> warnings regarding the consumption of fish from Delta waterways. While the SSJID Canal and <br /> French Camp Slough are not identified as impaired for mercury on the California 303(d) list, <br />