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h. <br /> 6. MONITORING WELL INSTALLATION AND DESTRUCTION REPORT <br /> City of Stockton <br /> L Regional Wastewater Control Facility <br /> 2500 Navy Drive <br /> LStockton,California <br /> j 1.0 INTRODUCTION <br /> L This report was prepared by Condor Earth Technologies, Inc. (Condor) on behalf of the City of Stockton <br /> (City) Department of Municipal Utilities (MUD) to describe the monitoring well installation and <br /> destruction activities conducted in April and May 2010 for the City's Regional Wastewater Control <br /> Facility(RWCF) located at 2500 Navy Drive (Site) in Stockton, California(Figures 1 and 2, Attachment <br /> A). <br /> LWork activities included the installation, development, and survey of four monitoring wells (MW-1S, <br /> MW-2S, and paired monitoring wells MW-19/MW-19S) and the destruction of monitoring well MW-4. <br /> All work conducted by Condor was performed under the supervision of a State of California Certified <br /> �. Engineering Geologist. The fieldwork and reporting were conducted in accordance with San Joaquin <br /> County Environmental Health Department(SJCEHD)and Central Valley Regional Water Quality Control <br /> L Board (Regional Water Board) guidelines and requirements. This report includes project background <br /> information and a description of the fieldwork conducted. Attached to this report are maps showing the <br /> Site's vicinity and monitoring well locations (Figures 1 and 2, respectively, Attachment A); Regional <br /> L Water Board approval letters and SJCEHD monitoring well installation/destruction permit (Attachment <br /> B); geologic logs and well survey data (Attachment C); and monitoring well development field forms <br /> (Attachment D). <br /> 2.0 PROJECT BACKGROUND <br /> The RWCF consists of a primary and secondary treatment facility on the east side of the San Joaquin <br /> River (SJR). Treated effluent is piped under the SJR to the tertiary treatment facilities west of the river. <br /> ` Tertiary treatment facilities west of the SJR include approximately 630 acres of facultative oxidation <br /> ponds surrounded by distribution canals and groundwater interceptor ditches; an engineered wetland <br /> (formerly Pond 4); disinfection facilities; and a river outfall discharge system. Groundwater monitoring at <br /> the facility was initiated in 2003 and has continued on a quarterly basis. The City currently maintains a <br /> network of 21 active monitoring wells around the RWCF that are sampled quarterly or semi-annually. <br /> In December 2003, Geotechnical Consultants, Inc. (GTC)completed 16 monitoring wells(MW-1 through <br /> MW-16) at the Site to monitor the potential impact on groundwater by RWCF operations and to evaluate <br /> compliance with Regional Water Board Waste Discharge Requirements (WDR) Monitoring and <br /> Reporting Program (MRP) Order No. R5-2002-0083, dated April 26, 2002. Monitoring well installation <br /> L and development details for MW-1 through MW-16 are provided in GTC's Well Installation Report, <br /> Stockton Regional Wastewater Control Facility, Stockton, Calif.,dated January 2004. <br /> r, Groundwater monitoring was initiated during the fourth quarter 2003; GTC conducted the Site's quarterly <br /> groundwater monitoring program through the third quarter 2004. GTC concluded that groundwater <br /> quality at the perimeter of the RWCF was not significantly degraded compared to the background water <br /> '` quality and recommended the following: <br /> 6. <br /> w A�_ <br /> Ir 1, CONDOR <br />