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i 28 January 1996 ' AGE-NC Project No 95-0144 Page 2 of 6 ' 23 SITE ASSESSMENT Between 1990 and 1994, five ground water monitoring wells and two soil borings were installed at rthe site by Resna Industries Hydrocarbon-impacted soil and ground water were encountered during the initial investigation Results of the Resna investigation have been summarized in numerous reports ' submitted between 1990 and 1994, and are not recounted herein In 1995, AGE completed assessment of hydrocarbon-impacted soil by advancing 17 soil probings at ' the site four probings were installed near each former tank location for Tanks No 1, 2 and 8, five probings were installed near the former location of Tank No 3 Soil samples were collected from 13 probings, ground water samples were collected from five probings Results of the later assessment ' investigation were summarized in the Quarterly Report -June 1995 prepared by AGE 3.0. PROCEDURES 3 1 DRILLING AND SAMPLING To complete the assessment of hydrocarbon-impacted ground water at the site, AGE installed four additional ground water monitoring wells Between 26 and 28 September 1995, borings MW-11, MW-12 and MW-13 were advanced to depths of 37 feet below surface grade (bsg), and were completed as ground water monitoring wells On 17 November 1995, one soil boring was advanced immediately east of the site in Madison Street Boring MW-18 was advanced to a depth of 36 feet ' bsg and completed as a ground water monitoring well Well locations are illustrated in Figure 2 ' All borings were drilled using a truck-mounted CME-55 drill rig The drill rig and two-man crew were supplied by Soils Exploration Services, Inc (SES) of Benicia, California During drilling, auger returns were monitored for the presence of organic vapors using a photo-ionization detector(PID ' Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) Soil samples were collected ahead of the drill bit using a split-tube sampler loaded with three pre- cleaned 2-inch by 6-inch brass sleeves The samples were collected at five-foot intervals, using a 140- pound hammer to advance the sampler 18 inches The number of blows required to advance the sampler in 6-inch increments was recorded on the boring logs To avoid cross-contamination, the ' sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run Augers were steam-cleaned between borings Auger returns were placed on plastic sheeting and stored on-site ' Each soil sample collected for analysis was preserved in the lead sleeve by covering both ends of the . sleeve with Teflon sheets, capping and sealing with tape The samples were then stored on ice and ' transported under chain-of-custody to McCampbell Analytical, Inc (MAI) in Pacheco, California