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REVISED WASTE DISCHARGE REQUIREMENTS ORDER NO. 97-115 13 <br /> CITY OF MANTECA AND CITY OF LATHROP <br /> WASTEWATER QUALITY CONTROL FACILITY <br /> SAN JOAQUIN COUNTY <br /> Task Date <br /> a. Submit the results of an industrial user survey. 1 Jan 1998 <br /> b. Submit an Inspection and Monitoring Program. 1 Feb 1998 <br /> c. Submit specific effluent limitations (local limits) 1 April 1998 <br /> for the general prohibited pollutants which shall <br /> Incorporated into the pretreatment ordinance. <br /> d. Submit Legal Authority and control mechanism 1 June 1998 <br /> Implementation documentation, an Enforcement <br /> Response Program, and a list of resource allotments <br /> for the program. <br /> e. Submit proposed Pretreatment Ordinance 1 June 1998 <br /> f. Adoption and Implementation of Approved 60 days after <br /> Program. approval <br /> 7. The Discharger shall initiate construction of the diffuser by 1 June 2001, and have the <br /> diffuser fully operational by 1 December 2001. <br /> The Discharger shall establish river velocity station near the point of discharge, with <br /> sufficient sensitivity to measure flows as low as 0.5 ft/sec and shall be fully operational by <br /> 1 June 2001. Interim river velocity monitoring will be conducted by field measurement in <br /> accordance with an approved work plan. The workplan for measuring river flow velocity <br /> prior to 1 June 2001 shall be submitted to the Board for Executive officer approval by 1 May <br /> 2000. River velocity monitoring shall begin immediately upon Board approval. <br /> 8. By 1 August 2000, the Discharger shall conduct a receiving water sampling investigation to <br /> confirm accuracy of the CORMLY model in predicting the existing side-shore discharge <br /> under current discharge and receiving water conditions. The results of the confirmation study <br /> shall be submitted to the Board by 15 September 2000. The study shall consider flow <br /> reversals in the river that could concentrate constituents of concern. The results of the study <br /> shall be used to evaluate the modeled worse case low flow conditions, the maximum effluent <br /> flow and maximum effluent concentration of ammonia that could be discharged to the San <br /> Joaquin River. A workplan must be submitted to the Board for approval by 1 May 2000 for <br /> approval prior to implementation of the study. <br /> If after review of the study results it is determined that the discharge has reasonable potential <br /> to cause or contribute and exceedance of water quality objectives beyond the initial zone of <br /> dilution(ZID) described in finding 20, then this Order may be reopened and effluent <br /> limitations may be modified. <br />