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Quarterly Report - Second Quarter 2000 <br /> • Former ARCO MINI-MART <br /> I4511 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 second quarter 2000 for the site located at 4511 Pacific Avenue, <br /> Stockton, California (the site) l,igure 1 shows the site location The scope of work included <br /> installation of three single-completed and two dual-completed ground water monitoring wells and <br /> monitoring of the ground water monitoring well network on the site This report documents <br /> collection and analysis of soil and ground water samples and the results of a ground water <br /> monitoring event <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 /> I December 1998 Data from previous ground water monitoring events are included in the tables of <br /> this report <br /> 2.0. PROCEDURES <br /> ISeven ground water monitoring wells and one vapor extraction well were purged and sampled on <br /> 26 April 2000 Scvcn ground water monitoring wells were installed in June 2000, and were purged <br /> and sampled on 20 June 2000 Field procedures were performed in accordance with Central Valley <br />' Regional Water Quality Control Board (CVRWQCB) and San Joaquin County Public Health <br /> Services - Environmental Health Division (PHS-EHD) guidelines for subsurface investigations of <br /> underground storage tank (UST) sites <br /> 21 DRILLING AND SAMPLING <br /> In June 2000, five soil borings were advanced at the site Three soil borings were advanced using <br /> a CME-75 drill ng, equipped with 8 25-inch diameter hollow-stem augers to advance borings MW8 <br /> through MW 10 Two soil borings were advanced using a CME-75 anil ng, equipped with iO-tneti <br /> diameter hollow-stem augers to advance borings MW 11 and MW 12 The dell rig and two-man crew <br /> were supplied by West Hazmat Drilling Auger returns generated by drilling were stored on-site in <br /> Department of Transportation (DOT)-approved 55-gallon drums, pending laboratory analysis <br /> i <br /> Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler <br /> . loaded with three pre-cleaned 2-inch by 6-inch brass sleeves The samples were collected from <br /> monitoring well pilot bonngs MW8 through MW 12 at five-foot intervals, bcginning at 5 feet bsg <br /> Advanced Geo E nviron mental Inc <br />