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I •, Quarterly Report - Second Quarter 2001 I PACIFIC MINI-MART 4511 Pacific Avenue, Stockton, California ' 1.0 INTRODUCTION AND SCOPE OF WORK At the request of Mr Art Wyatt,Advanced GeoEnvironmental,Inc (AGE)has prepared this ground water monitoring report for the second quarter 2001 for the site located at 4511 Pacific Avenue, Stockton, California. (the site) Figure 1 shows the site location The scope of work included I monitoring of the ground water monitoring well network on the site This report documents collection and analysis of ground water samples and the results of a ground water monitoring event Structures, monitoring well and soil boring locations on and adjacent to the site are illustrated in Figure 2 The site history and a description of previous work performed at the site were detailed in Quarterly Report-March 1996 dated 30 April 1996, prepared by AGE Findings from the latest soil and grab ground water sampling event were detailed in Quarterly Report-June 1998, prepared by AGE dated 22 December 1998 Data from previous ground water monitoring events are included in the tables of this report ' 2.0 PROCEDURES Fourteen ground water monitoring wells were purged and sampled on 24 April 2001 Field procedures were performed in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) and San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) guidelines for subsurface investigations of underground storage tank (UST) sites and sampling of ground water monitoring wells 21 MONITORING WELL PURGE PROCEDURES On 24 April 2001, a Solmst water level meter was used to measure the depth to ground water in ' monitoring wells MW1 through MW12B, vapor well VWl, and extraction well EW-1 and wells MW-7 and MW-8 from the Pacific Car Wash investigation After depth to ground water measurements, a minimum of 3 casing-water volumes of water were purged from each well to be sampled using a PVC submersible two-stage pump Approximately 7 to 22 gallons were purged from each well Seventy-five gallons were purged from extraction well EW-I and MW-9 was pumped dry at 4 gallons Temperature, pH and conductivity of purged ground water were measured at 1-, 2--, 3-, 4- and ---I 0::gallon intervals,-as appropriate for each well;using-a Hydac-water-analyzer The-field-dataand field sheets are included in Appendix A Purged water was temporarily stored on-site in 55-gallon DOT-approved H-17 storage drums pending proper disposal Following purging,the depth to ground Advanced GeoEnvironmental Inc