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1 <br /> I r <br /> F <br /> 1 ~ <br /> i" <br /> 24 August 1998 <br /> I ' n j F ry <br /> AGE-NC Project No 96-0232 h <br /> Page 2 of 8 _ <br /> 1 y 1 I I r <br /> I <br /> 2 2 1 Soil Sample Collection <br /> " Discrete soil samples were collected at'S-foot intervals, beginning at 15 feet bsg from soil borings <br /> - r <br /> MW-5 and MW-6 and beginning at 10-feet bsg from soil boring MW-7 Soil samples were collected <br /> utilizing a California split-spoon sampler loaded with 2- by 6-in6h brass sleeves The sampler was <br /> driven by dropping a 140-pound weight from a height of 30 inches The number of blows required <br /> to drive each 6-inch length of the sampler (blow counts) was recorded on boring logs by an AGE <br /> staff geologist <br /> Soil samples were preserved by covering both ends of the second brass sleeve with Teflon sheets, , <br /> �> capping and sealing with tape Each preserved sample sleeve was labeled with soil boring location, <br /> depth, time, date and sampler's initials and placed in a chilled container under ice Selected soil <br /> samples were logged on a chain-of-custody,transported to a State of California Department of Toxic <br /> Substances Control (DTSC) certified laboratory and analyzed for the following <br /> r - Total petroleum,hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 5030/8015M, <br /> r , <br /> Volatile aromatics(benzene,toluene,ethyl benzene and xylene BTEX)with methyl tertiary' <br /> butyl ether (MTBE) in accordance with EPA method 8020, and <br /> • Fuel oxygenates, including tertiary butanol(TBA),di-isopropyl ether(DIPS),ethyl tert-butyl <br /> ether (ETBE) and tert-amyl methyl ether (TAME) and MTBE in accordance with EPA <br /> Method 8260 <br /> n <br /> 2 2 2 Equipment� Decontamination <br /> 1 � 1 <br /> Hollow stem augers used during' drilling'activities were steam cleaned prior to advancement in each bore hole Sampling tools and brass sleeves used for'sample collection were thoroughly washed in <br /> a solution of AIconox andl,rinsed with-clean tap water prior to each sampling run Following drilling <br /> activities, rinseate generated from decontaminating the equipment was placed in properly labeled <br />' D O T model 17H 55-gallon drums and was stored on-site in an area lacking public access '- <br /> 1 <br /> 223r <br /> Logging <br /> 1 y 1 <br /> During drilling activities,`sample duplicates were monitored for the presence of organic_yapo`rs <br />' (OVs) using an organic vapor meter equipped with a photo-ionization detector (PID Thermo <br /> Environmental 580A, 10 0 eV, calibrated to isobutylene)and were described on boring logs using - <br /> ` Advanced GeoEnvironmental,Inc <br /> , 1 , <br /> s <br /> 1 I I I <br /> r r = 1 <br /> � u <br />