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28 August 2000 <br /> AGE-NC Project No. 98-0481 <br /> Page 5 of 8 <br /> 3.0. PROCEDURES <br />' On 07 March 2000, two soil borings (SB-3 and SB-4) were advanced at the site as part of <br /> assessment activities related to the four former USTs. The field work was conducted as outlined in <br /> the PHD-EHD-approved work plan. <br /> 3.1. DRILLING ACTIVITIES <br />' Soil borings SB-3 was advanced utilizing an Access II drill rig equipped with 7-inch diameter hollow <br /> stem augers. Soil Boring SB-3 was advanced vertically to a depth of 23 feet bsg before encountering <br />' auger refusal. SB-4 was advanced utilizing a CME-75 drill rig equipped with 8.25-inch diameter <br /> hollow stem auger. SB-4 was advanced to 60 feet bsg. The drill rig and two-man crew were supplied <br /> by Cal-Nev Geo Exploration of Roseville, California. Auger returns generated by drilling were <br />' placed on plastic sheeting and stored on site pending laboratory analysis. <br /> 3.1.1. Soil Sample Collection <br /> Soil samples were collected ahead of the drill bit using a split-spoon sampler loaded with three pre- <br /> cleaned 2-inch by 6-inch brass sleeves. The samples were collected at five-foot intervals, beginning <br /> at 5 feet bsg in boring SB-3, and at ten-foot intervals beginning at a depth of 40 feet bsg in boring <br />' SB-4, using a 140-pound hammer to advance the sampler 18 inches. The number of blows required <br /> to advance the sampler in 6-inch increments was recorded on the boring logs. <br />' Both ends of the leading, soil-filled brass sleeve were covered with Teflon sheets, capped and sealed <br /> with tape. The samples were labeled, stored on ice and transported under chain-of-custody to <br /> McCampbell Analytical, Inc. (NW, a State of California Department of Health Services (DHS)- <br /> certified analytical laboratory. <br /> Each preserved sample was logged on a chain-of-custody form, placed in a chilled container and ' <br /> transported to a California Department of Health Services (DHS)-certified Iaboratory under chain <br /> of custody; selected samples were analyzed for: <br /> • Total petroleum hydrocarbons as gasoline (TPH-g) and diesel (TPH-d) by EPA Method <br /> 8015Modified; <br /> I Volatile aromatic compounds-benzene, toluene, ethyl-benzene, and total xylenes (BTEX) <br /> and methyl tertiary butyl ether (MTBE) by EPA Method 8020; and <br /> • Tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE) and tert <br /> amyl methyl ether(TAME), and MTBE by EPA Method 8260 Modified. <br /> Advanced GeoEnvironmental,Inc. <br />