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.. r ti./ <br /> 20 July 2000 <br /> AGE Project No. 98-0456 <br /> Page 3 of 7 <br /> Equal Elevation of Groundwater Fall 1997(FCD&WCD),AGE interprets the regional ground water <br /> flow direction to be towards the east. Ground water was encountered at 50 feet bsg during the site <br /> assessment. <br /> `~ 3.0. PROCEDURES <br /> On 16 March 2000, a total of five soil probe borings (B-1 through B-4 and AB-1) were advanced at <br /> �. the site as part of assessment activities of the two former USTs areas. The field work was conducted <br /> as outlined in the PHS-EHD-approved work plans dated 28 February 2000 and 12 March 2000. <br /> 3.1. DRILLING ACTIVITIES <br /> Soil probe borings B-1 through B-4 and AB-1 were advanced utilizing a van-mounted Geoprobe <br /> 5400 equipped with 1.125-inch diameter probe rods with an attached 2.15-inch diameter soil <br /> +- sampler,using"direct push"technology. Soil probe borings B-1 and AB-1 were advanced vertically <br /> to a depth of 50 feet bsg. Soil probe borings B-2, B-3 and B-4 were advanced vertically to a depth <br /> of 20 feet bsg. <br /> 3.1.1. Soil Sample Collection <br /> Idw <br /> Discrete soil samples were collected at 5-foot intervals beginning at 5 feet bsg to total depth of each <br /> boring. Soil samples were collected using a Geoprobe soil sampling assembly loaded with four pre- <br /> cleaned 1.125-inch by 6-inch brass sleeves. Soil samples were preserved by covering both ends of <br /> the brass sleeve with Teflon sheets, capping, and sealing with tape. Each sample sleeve was labeled <br /> with soil probe boring location, depth, time, date and sampler's initials. <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 laboratory under chain <br /> of custody; selected samples were analyzed for: <br /> ,.. 0 Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d <br /> and TPH-mo) by EPA Method 8015 Modified; <br /> • Volatile aromatic compounds-benzene,toluene, ethylbenzene,and total xylenes(BTEX) and <br /> methyl tertiary butyl ether (MTBE) by EPA Method 8020. <br /> • Halogenated volatile organic compounds (HVOC's) by EPA Method 8260. <br /> • Oxygenated fuel additives di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), <br /> Advanced Geo Environmental,Inc. <br /> +w+ <br />