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27 October 2000 <br /> -- AGE-NC Project No. 98-0497 <br /> Page 3 of 8 <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 /> 3.1. DRILLING AND SAMPLING <br /> On 14 and 15 August 2000, four soil borings(P-3, MW-1, MW-2, MW-3) were advanced at the site <br /> using a CME-85 drill rig, equipped with 8.25-inch diameter hollow-stem augers. The drill rig and <br /> two-man crew were supplied by West Hazmat Drilling. Auger returns generated by drilling were <br /> stored on-site within plastic sheeting, pending laboratory analysis. <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. Samples were collected from the soil <br /> borings completed as monitoring wells at five-foot intervals, beginning at 5 feet bsg using a 140- <br /> pound hammer to advance the sampler. Soil boring P-3 soil samples were collected at five-foot <br /> intervals, beginning at 65 feet bsg. <br /> The number of blows required to advance the sampler over each 6-inch increment of the 18-inch <br /> sampling interval was recorded on the boring logs. Sampling equipment was washed in an Alconox <br /> solution and rinsed with water prior to each sampling run to avoid cross-contamination. <br /> Soil samples were preserved by covering both ends of the leading or other selected sleeve with <br /> Teflon sheets, capping with plastic and sealing with tape. The samples were labeled, stored on ice <br /> and transported under chain-of-custody to McCambell.Analytical, Inc. (MAI), a State of California <br /> Department of Health Services (DHS)-certified analytical laboratory. <br /> 3.2. LOGGING <br /> Soil was extruded from a second brass sleeve or from the unpreserved portions of the soil in the core <br /> barrel samples and were screened for the presence of organic vapor using an organic vapor meter <br /> (OVM) equipped with a photo-ionization. detector (PID: Thermo Environmental 580A, 10.0 eV, <br /> calibrated to isobutylene),and the O VM readings were recorded on the boring log. The soil was then <br /> visually described in accordance with the Unified Soil Classification System(see Appendix A). <br /> Advanced GeoEnvironmenta[,Inc. <br />