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} 1 <br />' 26 April 2000 <br /> AGE-NC Project No 99-0520 <br />' Page 4 of 8 ' <br /> I4.0. SITE INVESTIGATION ACTIVITIES <br /> On 08 and 09 February, AGE advanced six soil borings for the construction of five ground water <br />' monitoring wells and collected soil samples Additionally, the five ground water monitoring wells <br /> were developed On 28 February 2000,ground water samples were collected from each of the ground <br /> water monitoring wells <br /> I , <br /> 41 DRILLING/SAMPLING AND WELL DESIGN <br />' On 08 and 09 February five ground water monitoring wells and one soil boring were installed on- <br /> site Drilling and sampling'was performed using a truck-mounted CME 75-HT drill rig equipped <br /> Iwith continuous flight 8-inch augers The drill rig and two-man crew were provided by WestHaz Mat <br /> Drilling of Rancho Cordova, California <br /> Soil samples were collected from each boring at five-foot intervals, beginning at five feet below <br /> surface grade(bsg), using a Califorma-modified split spoon sampler loaded with three clean 2-inch <br /> • by 6-mch brass sleeves A 140-pound hammer was utilized to advance the sampler 18 inches, the <br /> number of blows required to advance the sampler over 6-inch increments was recorded on the boring <br /> logs <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 Precision Enviro-tech (PET) of Stockton, California, a <br /> Department of Health Services (DHS)-certified analytical laboratory and were analyzed for the <br /> following <br /> I • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified'and <br /> I • Volatile aromatic compounds benzene, toluene, ethyl-benzene and total xylenes (BTEX), <br /> di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), ethanol, methyl-tertiary butyl <br /> I ether(MTBE),'tertiary-amyl methyl ether(TAME) and tertiary-butanol(TBA)in accordance <br /> with EPA Method 8260 Modified <br /> 42 EQUIPMENT DECONTAMINATION <br /> Hollow 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 /> Ithoroughly rinsed with tap water prior to each sampling run Following drilling activities, rinseate <br /> Advanced GeoEnvironmental,Inc. <br />