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1 <br /> QuarterlySeptember 1998 <br /> Report A - A <br /> CHAPIN BROS.,INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> ' lA. INTRODUCTION <br /> At the request of Mr Russell Chapin,Advanced GeoEnvlronmental, Inc (AGE) has prepared this <br /> ' Quarterly Report of field activities conducted at 1766 Monte Diablo Avenue, Stockton, California <br /> The work completed included quarterly ground water monitoring activities conducted on 30 <br /> September 1998 and ongoing soil and ground water remediation activities at the site <br /> The site setting is illustrated in Figure 1 •Location Map Structures and well locations on or near the <br /> ' site are illustrated in Figure 2 - Site Plan <br /> Site history and findings from previous investigations and monitoring events at the site are <br /> summarized in Problem Assessment Report (PAR) prepared by Science & Engmeenng Analysis <br /> Corporation(SEACOR)dated 22 July 1994 and in the Quarterly Report-September 1995,prepared <br /> ' by AGE, dated 03 October 1995 <br /> 2.0. PROCEDURES <br /> Ground water monitoring activities were performed in accordance with guidelines for the subsurface <br /> ' investigation and remediation of underground storage tank (UST) sites established by the San <br /> Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central <br /> Valley Regional Water Quality Control Board (CVRWQCB), and were performed in accordance <br /> ' with the approved Work Plan Addendum, dated 07 April 1997 <br /> ' 2 1 MONITORING WELL PURGE PROCEDURES <br /> On 30 September 1998, a Soling water level meter was used to measure the depth to ground water <br /> ' in monitoring wells MW-1 through MW-7 relative to the tops of the well casings The ground water <br /> elevations were calculated by subtracting the depths to ground water from the surveyed well casing <br /> ' elevations(Table 1) <br /> After measuring and recording the depth to ground water measurements, monitoring wells MW-1 <br /> ' through MW-7 were purged using a Mo-stage purge pump A minimum of three well volumes of <br /> water was removed from each well Ground water parameters (temperature, pH and conductivity) <br /> of purged ground water were measured at two-gallon and five-gallon intervals using an ICM model <br /> ' 52200 water analyzer Dissolved oxygen measurements of ground water were collected using a YSI- <br /> 55 dissolved oxygen meter <br /> Advanced GeoEavironmental,Inc- <br />