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1 ' 20 March 2002 AGE-NC Project No 01-0877 ' Page 3 of 7 ' El Dorado Street)the prevailing ground water flow direction in the vicinity of the site is inferred to be toward the northeast However, flow direction may be both locally and seasonably variable r3.0. PROCEDURES ' On 04 January 2002, four soil borings were advanced at the site as part of the assessment related to the former USTs The field work was conducted as outlined in the AGE-prepared Preliminary Site Assessment Work Plan, dated 24 October 2001 31 DRILLING ' Soil probe borings B 1 through B4 were advanced utilizing a van-mounted Geoprobe 5400 equipped with 1 125-inch diameter probe rods with an attached 2 15-inch diameter soil sampler,using"direct ' push"technology The probe borings were advanced vertically to depths of 40 feet bsg 32 SOIL SAMPLING ' Discrete soil samples were collected at 5-foot intervals,beginning at 5 feet bsg in boring B1 and at 10 feet bsg in borings B2, B3 and B4 to 30 feet bsg Soil samples were collected using a Geoprobe soil sampling assembly loaded with four pre-cleaned 1 125-inch by 6-inch brass sleeves Soil samples were preserved by covering both ends of the brass sleeve with Teflon sheets, capping, and sealing with tape Each sample sleeve was labeled with soil probe boring location,depth,time,date and sampler's initials Each preserved sample was logged on a chain-of=custody form, placed in a chilled container and transported to Cal Tech Environmental Laboratories (CTEL), a State of California Department of ' Health Services (DHS)-certified laboratory ' 33 SOIL ANALYSES Selected samples were analyzed for the following • TPH-g, TPH-d and TPH-mo in accordance with EPA Method 8015 Modified, • Total recoverable petroleum hydrocarbons[(TRPH)oil and grease] in accordance with EPA Method 418 1, • Advanced GeoEnvironmental,Inc