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Y z'p Yk-`, e L _ ' ^ 1 - h ., r y •^ x ` i Y ,.. i - 1 .. , F . 04 April 2000 AGE-NC Project No 95-0142 ' Page 2 of 4' Soil samples were collected ahead of the drill bit using a California-modified split-tube sampler ' loaded with three pre-cleaned 2-inch by 6-inch brass sleeves The samples were collected from monitoring well pilot soil borings MW-7 and MW-8, at five-foot intervals,beginning at 45 feet bsg, using a 140-pound hammer to advance the sampler 18 inches< The'number of blows required to y ' advance the sampler in 6-inch increments was recorded on the boring logs All sampling equipment was washed in an Alconox solution and rinsed with water'prior to each sampling run to avoid cross- contamination Both ends of the leading or selected soil-filled sleeve were covered with Teflon sheets, capped and ' sealed with tape The preserved samples were labeled and were stored on ice pending transportation to a State of California Department of Health Services (DHS)-certified analytical laboratory Only soil sample from well,MW-7 were sent under chain-of-custody to McCampbell Analytical, Inc ' (MAI) for analysis t22 WELL AND BORING COMPLETION i Borings MW-7 and MW-8 were completed as ground water monitoring wells using two-inch diameter PVC casing with 0 020-inch slotted screen installed from approximately 80 feet to 70 feet bsg with blank casing extended to the surface The filter pack (No 3 Lonestar sand) was installed from 80 feet to approximately 67 feet bsg A nominal 5-foot bentonite pellet plug was then installed ' above the filter pack and was well hydrated The wells were then grouted to near the surface with portland cement Water-tight, traffic-rated well boxes were then installed over the wells Soil boring logs with the well construction are depicted in Appendix A ' 23 LABORATORY ANALYSES OF SOIL SAMPLES i Selected soil samples were analyzed for •, .Total petroleum hydrocarbons quantified 4as gasoline (TPH-g) in accordance with EPA _ Method 8015 Modified, • Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020, and ' • Oxygenated fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), ' methyl tertiary-butyl ether(MTBE), tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA) in accordance with EPA Method 8260 Modified, respectively Advanced GeoEnvironmental,Inc , r i s '