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Fourth Quarter 2004 and Annual Remediation Report <br /> CHAPIN BROTHERS INVESTMENTS, INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> 1 1.0. INTRODUCTION ' <br /> i <br /> At the request of Mr Russell Chapin,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> ' report for the site located at 1766 Monte Diablo Avenue, Stockton, California This report <br /> documents the fourth quarter 2004 ground water monitoring event and procedures for annual <br /> operation and monitoring of the ground water extraction treatment system The site setting is <br /> ' illustrated in Figure 1 Structures and well locations on or near the site are illustrated in Figure 2 <br /> Background information and a description of prior investigations at the site are included in the <br /> Appendix A Quarterly monitoring data from January 1994 to the present is summarized in Tables 1 <br /> and 2 in this report <br /> 2.0 PROCEDURES <br /> ' All field work was performed in accordance with Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites <br /> ' • Ground water treatment operation and monitoring were performed in accordance with procedures <br /> described in the approved Remedial Action WorkPlan Addendum,dated 28 June 2001 Groundwater <br /> monitoring activities were performed in accordance with guidelines established by the San Joaquin <br /> County Environmental Health Department (EHD) and the CVRWQCB <br /> ' 21 GROUND WATER TREATMENT OPERATION <br /> Between 15 December 2003 and 18 December 2004,the ground water pump-and-treat system was <br /> in continuous operation at the site,operating at a maximum flow rate of up to 10 gallons per minute <br /> (GPM) The pump in each of the four recovery wells operated on an intermitting cycle, extracting <br /> ground water at a flow rate of approximately 10 GPM, the intermitting operation of each pump <br /> provided a minimum four minute hiatus to allow the water level to recharge within each well <br /> Extracted ground water was routed through a ground water treatment system consisting of granular <br /> activated carbon (GAC) Following treatment, water was discharged underground via 1-inch <br /> diameter poly vinyl chloride (PVC) piping to the City of Stockton sewer system <br /> Effluent flow meter readings utilizing a Blue-White Industries F-2000 flow meter recorded <br /> approximately 771,871 gallons of water treated and discharged to the City of Stockton sewer system <br /> 1 under permit during 2004 The groundwater treatment system operates on a batch basis,with a daily <br /> total of approximately 2,500 gallons Once the holding tank fills with approximately 750 gallons of <br /> Advanced Geo Environmental,Inc <br />