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, 14,September 1998 . .. .� .', AGE-NC Project No. 98-0440 . Page 3 of 9 3.0: PROCEDURES 3:1.• INSTALLATION OF GROUND WATER:MONITORING WELLS On"08,4 09'and X10 July 1998,'Iten soil borings.(B1_through'B6 and MW-1.through MW-4) were advanced'ori aril off--site a5 part-of site assessment activities re lafed to ihe-former UST facility_: Soil,: `• . borings B1 through B6 were advanced vertically to maximum depths of 30'feet bsg; soil borings,' ' MW-1 throu h MW-4 were advanced vertically to maximum depths of.25-feet bsg. Soil borin 's• g Y , p g . g ,. - _ .were advanced utilizing a B-60 truck-mounted drill rig equipped with 8-inch diameter hollow stem augers. During drilling activities,•all rinseate was containerized in properly labeled b.O.T, model a',17H 55-gallon drums,while soil cuttings were•stockpiled on'plasti6 sheeting•in an' area at the'site lacking public access. The soil boring locations are depicted in Figure 2: . 3.L L'. Soil}Sample Coll'ectibn' Soil samples were continuously sampled from:soil boring B1 utilizing a 5-foot macro core sampler, beginning at 15f feet bsg. Discrete soil,samples were collected at 5=foot•intervals from soil,borih. gs B2 through B6 and'MW= lI through MW-4. Soisamples were collected starting at depths of 5 feet bsg from soil borings B4 through B6 and MW-1 through MW-4; starting at depths of.10 feet bsg from -boring B2.and starting'at-depihs of 15-fee bsg from soil boring B3. Soil samples were collected:utilizing,a California-split-spoon sampler loaded with 2-inch by 6-inch brass sleeves. The •sampler`was:driven'.Yy'dropping,a 140-pound weight from a height of 30 inches. The numberof blows required to drive each 6-inch length of the sampler(blow counts) was recorded on boring logs by aia.AGE staff geologist: Soli°samples were preserved by covering bath ends of the second brass sleeve.with Teflon sheets,, ` capping . pp g:and sealing with tape. Each:preserved sample sleev�e,was labeled 'soil boring ' , depth;time;`date and sampler's initials. `Each preserved sample was logged on a chain=of-custody.,form; placed in.a'chilled.container and transported'to a California state-certified laboratory,for analysis in accordance with th',following:.. EPA•Method 503078015M-fortotal_petroleumhydrocarbons�4uantified as gasoline and diesel•. (TPH g`and TPH d,;respectively),° EPA Method 8020 for volatile aromatics (benzene, toluene, - benzene and "xylene: . BTEX) with methyl=tertiary.-1 iutyl'ether'(MTBE), and . • � EPA Method,8260 modified for tertiary'butanol (TBA),'dI-isopropyl ether (PIPE),:ethyl teirt butyl ether(ETBE).'and tert.amyl methyl ether(TAME), and t'o confirm and.quantify-MTBE' ' �.. Advanced GeoEnvironmental,Inc.