SITE INFORMATION AND CORRESPONDENCE_1993-2003

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INFORMATION SHEET 9 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 not have the reasonable potential to cause, or contribute to an in-stream excursion above a narrative or numeric water quality standard. As a means of collecting additional information necessary to conduct a complete reasonable potential analysis, this Order contains provisions that: Require the Discharger to conduct a study and provide information as to whether the levels of NTR, CTR, or other pollutants in the discharge have the reasonable potential to cause or contribute to an in-stream excursion above a numeric or narrative water quality standard, including Basin Plan numeric or narrative objectives and NTR and CTR pollutants; If pollutants in the discharge have a reasonable potential to cause or contribute to an in- stream excursion above a water quality standard, requires the Discharger to submit information to calculate effluent limitations for those pollutants; and Allow the Regional Board to reopen this Order and include effluent limitations for those pollutants. On 10 September 2001, the Executive Officer issued a letter, in conformance with Section 13267 of the California Water Code, requiring the Discharger to prepare a technical report assessing effluent and receiving water quality. A copy of that letter, including its Attachments I through IV, are incorporated into this Order as Attachment D. This Order includes a Provision that is intended to be consistent with the requirements of Attachment D in requiring sampling and reporting of NTR, CTR, and additional constituents to determine if the discharge has a reasonable potential to cause or contribute to an in-stream excursion above a water quality standard. Consideration of Effluent Limitations Technolozy Based Effluent Limitations Technology-based treatment requirements under section 301(b) of the CWA represent the minimum level of control that must be imposed in a permit issued under section 402 of the CWA. Regulations promulgated at 40 CFR 122.44 (a)require technology-based effluent limitations to be placed in NPDES permits based on national effluent limitations guidelines and standards,best professional judgment(BPJ), or a combination of the two. Total Volatile Organic Compounds (VOCs) Previous Order No. 95-258 included daily maximum and monthly median effluent limitations for total VOCs (1.0 ltg/L (ppb) and<0.5µg/L(ppb),respectively)based upon technically achievable treatment levels for air strippers. These technology based effluent limitations still apply to the discharge, and total VOC constituents have been detected in influent groundwater,prior to treatment, at concentrations up to 57.7 µg/L(ppb). Therefore, the daily maximum and monthly median effluent limitations for total VOCs have been retained and included in this Order.