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• Quarterly Report - January 1998 <br /> r <br /> LARRY'S AUTO REPAIR <br /> 308 North Grant Street, Stockton,California <br /> r <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> In accordance with a request from Mr Charles Skobrak,Advanced GeoEnvironmental, Inc (AGE) <br /> has prepared this report summarizing ground water monitoring activities performed at 308 North <br /> Grant Street, Stockton, Califorrita Quarterly ground water monitoring was conducted on 30 January <br /> 1998 The location of the site is Illustrated in Figure 1 -Location Map Structures and well locations <br /> are Illustrated on Figure 2 - Site Plan Background information was summarized in the Quarterly <br /> Report-August 1997 prepared by AGE <br /> Field work was performed in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Regional Water Quality Control Board -'Central <br /> Valley Region(RWQCB-CVR) guidelines for the investigation of underground storage tank (UST) <br /> sites <br /> 2.0. PROCEDURES' <br /> t• <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> On 30 January 1998, a Solinst water level meter was used to measure the depth to ground water in <br /> five monitoring wells and seven vapor wells at the site relative to the tops of the well casings A <br /> Ullage Interface probe was used to check for the presence of free product in wells MW-2, MW-4, <br /> VW-2B, VW-3, VW-4 and VW-5B The ground water elevations, ground water flow direction and <br /> hydraulic gradient were determined from these data (Table 1) <br /> IAfter measuring ground water depths, monitoring wells MW-1, MW-2, MW-3, MW-4 and MW-7 <br /> and vapor wells VW-2B, VW-3, VW-4, VW-513 and VW-5C were purged using a Grundfos <br /> submersible purge pump Approximately 3 to 18 gallons of water were removed from each purged <br /> well (minimum of three well-volumes for each well) Temperature, pH and conductivity were <br /> measured at regular intervals during purging The measured properties of the purged water and the <br /> field sheets are included in Appendix A The purged water was stored on-size in 55-gallon DOT <br /> drums pending laboratory analyses <br /> k <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable bailers Each sample was <br /> transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acid as a <br /> preservative The sample from MW-4 was also transferred Into a I-liter amber bottle without <br /> Advanced GcoEnvironmentai,Inc <br />