SITE INFORMATION AND CORRESPONDENCE 1980-1999

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FACT SHEET, ATTACHMENT C WASTE DISCHARGE REQUIREMENTS ORDER NO. 5-00- CITY OF LODI WHITE SLOUGH WATER POLLUTION CONTROL PLANT SAN JOAQUIN COUNTY EPA's Freshwater Ambient Water Quality Criteria DWS' CCC2 CMC, Endosulfan --- 0.056 0.22 Toxaphene 3.0 0.0002 0.73 DDT --- 0.001 1.1 1 Drinking Water Standard,most stringent from U.S.Environmental Protection Agency or California Department of Health Services 2 Criteria Continuous Concentration,an estimate of the highest concentration of a material in surface water to which an aquatic community can be exposed indefinitely without resulting in an unacceptable effect. 3 Criteria Maximum Concentration,an estimate of the highest concentration of material in surface water to which an aquatic community can be exposed briefly without resulting in an unacceptable effect. Lindane (an organochlorine pesticide) was detected in 7 of 19 sampling events and a single detection of DDT (also an organochlorine pesticide) was reported. The single detection of DDT is not adequate evidence that there is reasonable potential to exceed the water quality objectives. The detectable concentrations of lindane were less than freshwater ambient water quality criteria. However, per the Basin Plan requirements, this Order applies a non-detectable limitation to each individual pesticide at any detection level. No individual pesticide may be present in the discharge at detectable concentrations. The Discharger should use EPA standard analytical techniques that have the lowest practical detection level for organochlorine pesticides with a maximum acceptable detection level of 0.02 µg/1. This detection level was selected based on a review of the available pesticide analytical data. The Discharger is not currently capable of meeting this requirement. This Order requires the Discharger to monitor for all 303(d) listed pesticides including diazinon and chlorpyrifos, as outlined in the monitoring and reporting program. The Discharger will be required by the Order to determine whether the level of diazinon and chlorpyrifos in the discharge cause or contribute to an in-stream excursion above water quality objectives, and allows the Board to reopen this Order and include effluent limitations for these specific pesticides which are not addressed by the Basin Plan. k) Monitoring of Constituents in Receiving Waters There are presently four receiving water sample stations (R-1 through R-4) used to monitor water quality in the receiving waters. A fifth monitoring station (R-5) has been added for this Order. The frequencies of sampling and required analyses have been modified from the previous requirements and are summarized in Monitoring and Reporting No. 5-00- . These modifications reflect the need to better understand receiving water quality and its assimilative capacity for discharge of treated wastewater. Priority pollutant monitoring will be required at receiving water stations R-1 and R-2 collected with a quarterly frequency. Priority pollutant monitoring will be limited to Stations R-1 and R-2 since both locations represent the direct path of the effluent stream and will aid in our understanding of the potential for the receiving water to mix and dilute effluent priority pollutants. Daily DO monitoring at R-1 will be required since the DO conditions in Dredger Cut (5 mg/l or greater) is a limiting factor for effluent discharge.