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Quarterly Report - Third Quarter 2002 <br /> CHAPIN BROTHERS, 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 <br /> documents the operation of a low-flow ground water remediation system, the procedures for <br /> collection and analysis of ground water samples from the well network and the results of a ground <br /> water and treatment system monitoring events The site setting is Illustrated in Figurel Structures <br /> 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 /> 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 <br /> summarized 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 water treatment operation and monitoring were performed in accordance with procedures <br /> described in the approved Remedial Action Work Plan Addendum,dated 28 June 2001 Groundwater <br /> monitoring activities were performed in accordance with guidelines established by the San Joaquin <br /> County Enviromnental Health Department (EHD) and the CRWQCB <br /> 2 1 GROUND WATER TREATMENT OPERATION <br /> ' Between 30 May and 22 August 2002, the interim ground water pump-and-treat system was in <br /> continuous operation at the site, operating at a maximum flow rate of up to 12 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 up to a 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 <br /> diameter 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 641,602 gallons ofwater treated and discharged to the City of Stockton sewer system <br /> Advanced GeoEnviron mental,Inc <br /> 1 <br />