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IMonitoring Well Installation Report YAMADA BROTHERS 15406 South Tracy Boulevard, Stockton, California 1.0. INTRODUCTION At the request of Mr Bob Yamada, Advanced GeoEnvironmental, Inc (AGE) has prepared this Monitoring Well Installation Report for the property located at 15406 South Tracy Boulevard, Stockton, California(site) The site and the surrounding area are illustrated on Figure 1 Structures, boring and well locations are Illustrated on Figure 2 Background information is summarized in Appendix A 2.0 PROCEDURES Four ground water monitoring wells(MW-4 through MW-7)were Installed,developed and surveyed in April 2004 Three wells were scheduled for Installation, as outlined in the AGE-prepared Monitoring Well Installation Work Plan, dated 09 February 2004 and approved by the San Joaquin County Environmental Health Department (EHD)by letter dated 27 February 2004 A fourth well was installed at the request ofthe on-site regulator due to hydrocarbon odors detected during drilling, as shown in the regulatory letter included in Appendix B Field work was performed in accordance with guidelines Issued by the Central Valley Regional Water Quality Control Board(CVRWQCB) for the Investigation of underground storage tanks (UST) sites 21 DRILLING AND SAMPLING I IOn 15 April 2004, four soil borings were advanced at the site The soil borings were advanced using a CME-75HT drill rig, utilizing 8 25-Inch diameter hollow-stem augers The drill ng and two-man crew were supplied by Mitchell Drilling Environmental Auger returns generated by drilling were containerized in properly labeled Department of Transportation (DOT)-approved model 17H 55-gallon drums and stored on-site Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler loaded with three pre-cleaned 2-Inch by 6-inch brass sleeves The samples were collected from the I pilot borings at five-foot intervals,beginning at 5 feet below surface grade(bsg),using a 140-pound hammer to advance the sampler The number of blows required to advance the sampler over each 6-inch Increment of the 18-Inch sampling interval was recorded on the boring logs For each sample,both ends of the second or other selected sleeve were covered with Teflon sheets, capped and sealed with tape The samples were labeled, stored on Ice and transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a State of California Department of Health Services (DHS)-certified analytical laboratory Selected soil samples were analyzed for IAdvanced GeoEnvironmental,Inc I