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• <br /> TENTATIVE WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2003-OOXX 3 <br /> LINCOLN CENTER ENVIRONMENTAL REMEDIATION TRUST <br /> SAN JOAQUIN COUNTY <br /> i <br /> 11. The Discharger proposes to install five monitoring well clusters for the proposed pilot test. The <br /> locations of the monitoring well clusters will provide characterization of the area of influence of <br /> the injection points and assess changes in the contaminant concentrations in groundwater. One <br /> well cluster is to be installed upgradient from the treatment zone, three well clusters are to be <br /> installed within the treatment zone (between and cross-gradient to the injection points) and one <br /> well cluster will be installed downgradient from the treatment zone. Each monitoring well <br /> cluster is to include one well screened between 30 and 40 feet bgs and one well screened <br /> between 40 and 50 feet bgs. <br /> 12. The background groundwater quality(key parameters) for the site, as measured from samples <br /> taken from MW-006A (MW-100A for iron) on May 20, 2003, is summarized as follows: <br /> Constituent Units Concentration Water Reference <br /> Range Quality <br /> Limit <br /> Iron ug/1 ND < 100 ug/1 300 California Secondary MCL <br /> Chloride mg/l 42 250 California Secondary MCL <br /> H 6.8 6.5 to 8.5 US EPA Secondary MCL <br /> Total mg/l 770 500 California Secondary MCL <br /> Dissolved <br /> Solids <br /> In order to assess the groundwater conditions prior to performance of the pilot study, the <br /> Discharger proposes to conduct one round of base-line groundwater monitoring prior to initiation <br /> of GZVI injection. Following GZVI injection, groundwater monitoring is proposed to be <br /> performed at 2, 6 and 10 weeks. <br /> 13. As a contingency, the Discharger will maintain hydraulic capture of the pilot study treatment <br /> zone using the existing groundwater extraction system. <br /> Basin Plan,Beneficial Uses, and Regulatory Considerations <br /> 14. Any release of GZVI into the groundwater is a discharge of waste as defined by the California <br /> Water Code. These WDRs authorize the Discharger to inject GZVI into groundwater according to <br /> all the conditions of this permit. <br /> 15. The Water Quality Control Plan, Sacramento River and San Joaquin River Basins,fourth <br /> edition, (Basin Plan) designates beneficial uses, establishes Water Quality Objectives (WQOs), <br /> contains implementation plans and policies for protecting waters of the basin, and incorporates <br />