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Quarterly Report - First 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 thus <br /> report for the site located at 1766 Monte Diablo Avenue, Stockton, California This report <br /> documents the operation of a ground water remediation system, the procedures for collection and <br /> ' analysis of ground water samples from the well network and the results of the first quarter ground <br /> water and treatment system monitoring events The site setting is Illustrated in Figure Structures <br /> and well locations on or near the site are Illustrated in Figure 2 <br /> ' <br /> Background Information and a description of prior investigations at the site are included in the <br /> �' P p g <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 WorkPlan Addendum,dated 28 June 2001 Groundwater <br /> ' momtonng activities were performed in accordance 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 27 December 2002 and 15 April 2003, the ground water pump-and-treat system was in <br /> continuous operation at the site, operating at a maximum flow rate of up to 11 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 PVC piping to the City of Stockton sewer system <br /> Effluent flow meter readings utilizing a Blue-White Industries F-2000 now meter recorded <br /> ' approximately 461,765 gallons of water treated and discharged to the City of Stockton sewer system <br /> Advanced GeoEnviron mental,Inc <br /> 1 <br />