SITE INFORMATION AND CORRESPONDENCE_1993-2003

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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0213 • 8 U.S.DEPARTMENT OF DEFENSE DEFENSE LOGISTICS AGENCY DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE GROUNDWATER REMEDIATION SYSTEM SAN JOAQUIN COUNTY Additionally, previous studies of chlorpyrifos conducted by Regional Board staff in French Camp Slough have found chlorpyrifos concentrations as high as 0.520 µg/L (micrograms per Liter), which is nearly 10 times the 96-hour Ceriodaphnia LC50 (median lethal concentration). 13. USEPA adopted the National Toxics Rule (NTR) on 5 February 1993 and the California Toxics Rule (CTR) on 18 May 2000. These Rules contain water quality standards applicable to this discharge. The State Water Resources Control Board (SWRCB) adopted the Police for Lxiplenzentation of Toxics Standards for Inland Surface Waters, Enclosed Bays, and Estuaries of California (known as the State Implementation Policy or SIP),which establishes requirements for implementation of the NTR and the CTR. 14. Federal regulations require effluent limitations for all pollutants that are or may be discharged at a level that will cause or have the reasonable potential to cause, or contribute to an in-stream excursion above a narrative or numeric water quality standard. The absence of a limitation for a constituent indicates either a lack of information is available for evaluation, or the constituent does 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: a. 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; b. 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 c. 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. 15. 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