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<br /> AGE NC Rroj ect N6.95 0114 '
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<br /> 2 3.1., Drillin and Sam lin '
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<br /> Soil borings`EW 1; MW8, MW9 and-MW 10 were -advanced onsite as part of'sitc assessment ,
<br /> activities related to the former USTs,at the site: Soil borings MW8 through,MW10 we're advanced
<br /> 'e' vertically'to a'total depth.of 45 feet Below-surface-grade(bsg), soil boring EWI. was advanced to-50
<br /> feetbsg. The soil borings for the;monitoring wells were advanced.utilizing.4 CME-75 high torque,
<br /> truck-mounted drill rig equipped-with 8-inch-diameter hollow-stem,augers and the soil,boring for
<br /> •extraction.well EWl was advanced'utilizing 12-inch diameter hollow-stem augers. Soil cuttings we're
<br /> placed in labeled DOT-approved model'1.7H 55=2allon drums and stored on site pending'disposal;
<br /> the sollyboriilg and monitoring well':locatioris are depicted in Figure 2.
<br /> 2.3,2. Soil Sample Collection and Analysis. ,
<br /> Discrete soil samples were,collected at 5-foot intervals beginning at varying depths from soil borings
<br /> ' MWB, MW9�and MW10; soil samples:were collected beginning at, 10 feet bsg from soil boring
<br /> MWS and MW9;and at 25'feet bsg from soil boring MW10. Soil.samples-were not collected-from
<br /> soil boring EW 1.
<br /> Soil samples were collected,utilizing a California split-spoon sampler loaded with 2-inch by-6-inch
<br /> brass sleeves. The sampler was'driven by dropping a 140:-pound weight from a height of 30 inches.
<br /> The number of blows required to drive each 6-inch'length of the sampler(blow counts}was recorded
<br /> "on Boring logs-by an.AGE-staff geologist.-
<br /> 'Soil
<br /> eologist:"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: j
<br /> Each sample preserved for analysis was logged on a chain-of custody form, placed in a chilled'� .
<br /> container and transported to a.Callfornia Department of Health Services(DHS}certified laboratory,
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<br /> for analysis for:anal '
<br /> ' Totalpetroleum: hydrocarbons quantified-as gasoline' and,diesel (TPH-g_:and TRH-d,
<br /> respectively)by EPA Method 8015 Modified; ;
<br /> • Volatile aromatic compounds benzene.-toluene, ethylbenzene and.xylene (BTEX)'.with '
<br /> 'I methyl=tertiarybutyi'ether(N4TBE)by EPA Method 8020; and ;
<br /> Methanol,; ethanol, ethylene dibromide (EDB), ;1;27dichloroethane.(1,2-DCA), tertiary
<br /> ' butanol (TBA);-di-isopropyl'ether (DIPE), ethyl telt butyl ether (ETBE), tert'amyl methyl,',
<br /> ether'(TAME); andconfirmation of MTBE_ by EPA Method 8260•Modified.-
<br /> Advanced GeoEnvironMcninl,Inc.
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