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I18 September 1998 <br /> AGE-NC Project No 96-0254 <br /> Page 2 of 8 <br /> of the 2450 Toste Road property Drilling and sampling was performed using a truck-mounted CME <br /> 75-HT drill ng equipped with continuous flight 8-inch and 10-inch hollow-stem augers The drill <br /> ng and two-man crew were provided by Soils Exploration Service (SES) of Rancho Cordova, <br /> California Soil bonngs completed as dual-screened ground water monitoring wells were established <br /> with 10-inch hollow-stem augers Soil borings completed as a single-screened ground water well <br /> were established with 8-inch hollow-stem augers <br /> Soil samples were collected from each boring at five-foot intervals, beginning at five feet below <br /> surface grade (bsg), using a California split tube sampler loaded with three clean 2-inch by 6-inch <br /> brass sleeves A 140-pound hammer was utilized to advance the sampler 18 inches, the number of <br /> blows required to advance the sampler over 6-inch increments was recorded on the boring logs All <br /> I sampling equipment was washed in an Alconox solution and rinsed twice with water prior to each <br /> sampling run <br /> Both ends of the soil sleeve of each sample collected for laboratory analysis were covered with <br /> Teflon sheets, capped and sealed with tape The samples were stored in a chilled container, <br /> transported under chain-of-custody to McCampbell Analytical Inc (MAI), in Pacheco, California <br /> and analyzed for the following <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Methods 5030/8015m, <br /> • Volatile aromatic compounds (benzene,toluene, ethyl-benzene and total xylenes, BTEX) in <br /> accordance with EPA Methods 8020, <br /> • Fuel oxygenzates Including methyl tertiary butyl ether (MTBE), tertiary butyl alcohol <br /> (TBA), di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE) and tertiary amyl methyl <br /> ether (TAME) in accordance with EPA Method 8260m <br /> 22 EQUIPMENT DECONTAMINATION <br /> tHollow stem augers were steam cleaned prior to boring advancement Sampling tools and brass <br /> sleeves used for sample collection were thoroughly washed with a solution of Alconox and <br /> thoroughly rinsed with tap water prior to each sampling run Following drilling activities,rmseate <br /> generated from decontaminating the equipment was placed in properly labeled D O T model 17H <br /> 55-gallon drums and stored on-site in an area lacking public access <br /> �i <br /> I <br /> Advanced GeoEnvironmental Inc <br />