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0 Y) <br /> . Quarterly Report - Fourth Quarter 2003 <br /> CHAPIN BROTHERS INVESTMENTS, INC <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> 1.0. INTRODUCTION <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 documents <br /> the operation of a ground water remediation system, the procedures for collection and analysis of <br /> ground water samples from the well network and the results of the first quarter ground water and <br /> treatment system monitoring events The site setting is illustrated in Figure 1 Structures and well, <br /> 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 <br /> a <br /> 1 and 2 in this ieport <br /> a ' <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 ti eatment operation and monitoring were performed in accordance with procedures <br /> described in the approved Remedial Action Work Plan Addendum,dated 28 June 2001 Ground water <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 11 September and 15 December 2003,the ground water extraction(pump-and-treat)system <br /> was in continuous operation at the site, operating at a maximum now rate of up to 15 gallons per <br /> minute (gpm) The pump in each of the four recovery wells operated on an intermitting cycle, <br /> extracting ground water at a flow rate of approximately 10 gallons per minute(gpm),the intermitting <br /> operation of each pump provided a minimum four-minute hiatus to allow the water level to recharge <br /> within each well <br /> At the direction of the EHD and CVRWQCB a month ground water treatment hiatus was conducted <br /> between 18 October and 17 November 2003, to measure the increase of dissolved benzene <br /> concentrations over the month period > <br /> Extracted ground water was routed through a ground water treatment system consisting of 4x80 <br /> granular activated carbon(GAC) Following treatment,water was discharged underground via 1-inch <br /> diameter PVC piping to the City of Stockton sewer system <br /> Advanced GeoEnvironmental,Inc <br />