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• <br /> STAFF REPORT -3- <br /> WHITE SLOUGH WATER POLLUTION CONTROL PLANT <br /> SAN JOAQUIN COUNTY <br /> disinfection for the waste discharge requirements. In a letter from the City of Lodi (dated 24 <br /> February 1999) to the Regional Water Quality Control Board, the city provided a cost estimate <br /> of between $10 to $15 million dollars to design and construct the proposed treatment facility. <br /> To date, there has been no elaboration or refinement of this rough estimate. <br /> 3. Effluent Chlorine Residual <br /> The effluent chlorine residual in the existing permit exceeds the US EPA recommendation for full <br /> protection of aquatic life; therefore, more protective chlorine residual limits are proposed for the <br /> permit. A weekly average and 1-hour average chlorine residual effluent limitation are presented in <br /> the proposed permit. <br /> 4. Cyanide <br /> Review effluent monitoring data indicates that cyanide was detected at concentrations <br /> exceeding both the Basin Plan Objective and EPA's ambient water quality criteria for <br /> protection of aquatic life. Because there is a reasonable potential for cyanide concentrations <br /> to exceed water quality objectives, effluent limitations for cyanide have been included in the <br /> proposed permit. The Discharger is not currently capable of meeting this limit and therefore a <br /> CDO for cyanide has also been proposed. <br /> 5. Lead <br /> Effluent monitoring for lead has shown that the total recoverable concentrations of lead in the <br /> effluent have exceeded the converted EPA's chronic criteria for protection of aquatic life. <br /> Effluent limitations for lead have been included in the proposed permit based on the converted <br /> chronic criteria. The Discharger is not currently capable of meeting this limit and therefore a <br /> CDO for lead has also been proposed. <br /> 6. Zinc <br /> Sampling results have shown that effluent concentrations of zinc have exceeded the converted <br /> acute and chronic EPA criteria, and also the Basin Plan water quality objective if converted to <br /> a total recoverable metal concentration. The Basin Plan objective is the most stringent and an <br /> effluent limitation for zinc has been included in this proposed permit based on the Basin Plan <br /> objective, with no mixing zone designated. The Discharger is not currently capable of <br /> meeting this limit and a CDO for zinc has been proposed. <br /> 7. Mercury <br /> Mercury is listed under the California 303(d) list as a pollutant causing impairment in the <br /> Sacramento-San Joaquin Delta. This listing is based partly on elevated levels of mercury in <br /> fish tissue. The discharge must not cause or contribute to an increased mercury level in fish <br /> tissue. The current EPA Ambient Water Quality Criteria for continuous concentration of <br />