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• y • <br /> WASTE DISCHARGE REQUIREMENTS -2- <br /> MARLEY COOLING TOWER COMPANY <br /> SAN JOAQUIN COUNTY <br /> contamination sources are the Retort Pit and the former Stormwater <br /> Retention Pond (now closed) , identified in Attachment B, incorporated <br /> herein and made part of this Order. Soils have been contaminated with <br /> copper, chromium, and arsenic; ground water has been contaminated with <br /> chromium and copper only. First ground water is approximately 60 feet <br /> below ground surface. A ground water contamination plume exceeding the <br /> Drinking Water Standard of 50 micrograms per liter (ug/1 ) for chromium, <br /> extends off-site threatening local domestic supplies. <br /> 8. The Board, on 28 November 1984, ratified a Settlement Agreement between <br /> the Department of Health Services, the Discharger and the Board. The <br /> Settlement Agreement required the Discharger to conduct a Remedial <br /> Investigation / Feasibility Study (RI/FS) to define the extent of <br /> contamination, to develop Remedial Action Plan (RAP) and to implement all <br /> measures necessary to remediate existing site contamination. <br /> 9. The RI/FS is essentially complete and the Discharger has prepared a final <br /> RAP for the site. On 29 August 1990 the Department of Health Services <br /> formally approved the Discharger's RAP, including the conceptual design <br /> of the ground water remedial project, following discussions with Board <br /> staff. <br /> 10. The recommended ground water remedial action in the RAP includes the <br /> discharge of up to 0.72 mgd of treated storm water and/or ground water to <br /> the Stockton Diverting Canal for an interim period, not to exceed 18 <br /> months. During this 18 month period the Discharger will be reevaluating <br /> discharge alternatives, including reuse and aquifer reinjection <br /> alternatives. In order to minimize the local dewatering of the aquifer <br /> caused by overdraft and to restore the aquifer as a usable drinking water <br /> source by recharge of the treated ground water and/or storm water, reuse <br /> and aquifer reinjection are to be evaluated as viable discharge <br /> alternatives. <br /> 11. The RWD was submitted in response to repeated violations of Effluent <br /> Limitation 1 in Order No. 88-124 for chromium, copper and total dissolved <br /> solids (TOS) during the first quarter of 1990. The Discharger was <br /> notified of the violations by letter dated 12 July 1990. <br /> 12. The RWD consisted of five technical documents entitled "Suggested <br /> Revisions to NPDES Permit", "Operation Description for Interim System", <br /> "Performance Monitoring of the Interim System", "Technical Report on <br /> Existing Water Treatment Plant Operation" and "Plan for Evaluation of <br /> Treated Water Disposal Alternatives" . <br /> 13. The Discharger was notified by letter dated 1 October 1990, that the RWD <br /> generally addressed the concerns associated with the permit violations <br /> except for those contingency plans for the operational and monitoring <br /> measures to be taken during wet weather events and in case of <br />