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Ground Water Monitoring Report - First Quarter 2000 <br /> Former ARCO MINI-MART <br />' 4511 Pacific Avenue, Stockton, California <br />' 1.0. INTRODUCTION AND SCOPE OF WORK <br />' At the request of Mr Art Wyatt,Advanced GeoEnvironmental, Inc (AGE) has prepared this ground , <br /> water monitoring report for the first quarter 2000 for the site located at 4511 Pacific Avenue, <br /> Stockton, California(the site) Figure 1 shows the site location The scope of work was to monitor <br /> I the ground water monitoring well network on the site This report documents collection and analysis <br /> of ground water samples and the results of ground water measurements <br />' Structures,monitoring well and soil boring locations are illustrated in Figure 2 The site history and <br /> a description of previous work performed at the site were detailed in the Quarterly Report-March <br /> 1996 dated 30 April 1996, prepared by AGE Findings from the latest soil and grab ground water <br />' sampling event were detailed in Quarterly Report - June 1998, prepared by AGE, dated 22 <br /> December 1998 Data from previous ground water monitoring events are included in the tables of <br /> this report <br /> I <br /> 2.0. PROCEDURES <br /> Field procedures were performed in accordance with Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) and San Joaquin County Public Health Services - Environmental Health <br /> Division (PHS-EHD) guidelines for subsurface investigations of underground storage tank (UST) <br /> sites <br /> 21 <br /> MONITORING WELL PURGE PROCEDURES <br /> IOn 31 January 2000, a Solinst water level meter was used to measure the depth to ground water in <br /> monitoring wells MW 1 through MW7 and vapor well V W 1 <br /> rAfter depth to ground water measurements, a minimum of 3 standing water casing volumes of water <br /> was purged from each well to be sampled using a PVC submersible two-stage pump Approximately <br /> 12 gallons of water were removed from vapor well VW1, 24 gallons of water were removed from <br /> well M W l, 20 gallons from wells MW2 and M W 3, 1-2 ga'l'lons water were removed from wells <br /> MW4, MW5, MW6 and MW7 Temperature, pH and conductivity of purged ground water were <br /> measured at 4-gallon, 5-gallon or 6-gallon intervals, as appropriate for each well, using a Hydac <br /> water analyzer The field data and field sheets are included in Appendix A Purged water was <br /> temporarily stored on-site in 55-gallon DOT-approved H-17 storage drums pending proper disposal <br /> Following purging, the depth to ground water was measured to ensure that a minimum of 80% well- <br /> volume recharge had been achieved prior to sampling <br /> Advanced GeoEnvi ron mental Inc <br /> I <br />