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1 <br /> Quarterly Report - Fourth Quarter 2002 <br /> ' CHAPIN BROTHERS,INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> ' <br /> 10. 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 DiabloAvenue,Stockton, California This report documents <br /> the operation of a low-flow ground water remediation system, the procedures for collection and <br /> analysis of ground water samples from the well network and the results of a ground water and <br /> treatment system monitoring events The site setting is illustrated in Figure Structures and well <br /> ' locations on or near the site are illustrated m Figure 2 <br /> Background information and a description of prior investigations at the site are included in the <br /> Problem Assessment Report (PAR) prepared by Science & Engineering Analysis Corporation <br /> (SEACOR) dated 22 July 1994 and in the AGE-prepared Quarterly Report -June and July 1999 <br /> dated 08 September 1999 Quarterly monitoring data from January 1994 to the present is summarized <br /> in Tables 1 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 w.ter treatment operation and monitoring were performed in accordance w, h procedures <br /> descnbedinthe approved Remedial Action WorkPlan Addendum, dated 28 June 2001 Groundwater <br /> monitoring activities were performed maccordance with guidelines established by the San Joaquin <br /> County Environmental Health Department(EHD) and the CRWQCB <br /> 1 <br /> 2 1 GROUND WATER TREATMENT OPERATION <br />' Between 22 August and 27 December 2002, the interim ground water pump-and-treat system was <br /> in continuous operation at the site, operating at a maximum flow rate of up to 14 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 allow <br /> for a minimum four minute hiatus interval,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 diameter <br />' PVC piping to the City of Stockton sewer system <br /> j Effluent flow meter readings utilizing a Blue-White Industries F-2000 flow meter recorded <br />' approximately 809,488 gallons ofwater treated and discharged to the City of Stockton sewer system <br /> Advanced GeoEnvironmentai,Inc <br />