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rrj �y Mr Martin Harms March 22, 2000 • Page 3 of 5 4.1 Subsurface Conditions Soil beneath the site consists primarily of well graded sand to a depth of approximately 11114 feet bgs, and clayey sand, silt, and lean clay from approximately 10114 feet bgs to at least 26 feet, the maximum depth explored Well graded sand was also encountered in boring SB2 at a depth of 24 feet bgs Groundwater was encountered at a depth of approximately 9 5 feet bgs in each boring Petroleum hydrocarbon odors and some discoloration were noted in each boring In boring SB 1, the soil samples collected from 4 and 14 feet bgs exhibited slight odors with no discoloration, and the sample collected from 9 feet bgs exhibited moderate to strong odors with discoloration In boring SB2, slight odors were noted in samples collected from 4, 14, and 19 feet bgs, and moderate to strong odors were noted in the sample collected from 9 feet bgs Discoloration was noted in the samples collected from 9 and 14 feet bgs Samples collected from 4 and 9 feet bgs in boring SB3 exhibited slight to moderate odors and discoloration The highest FID readings were recorded in the depth interval of 9-11 feet bgs in each of the three bonngs (6,000 parts per million [ppm] in SB 1, 8,000 ppm in SB2, and 500 ppm in SB3) Soil boring logs are included in Attachment A 4.2 Laboratory Analysis Soil samples collected at 10, 15 and 25 feet bgs from each boring were analyzed for total petroleum hydrocarbons as gasoline (TPHg) using EPA method 8015 modified, and benzene, toluene, ethylbenzene and xylenes (BTEX) using EPA method 8020 In addition, the soil samples collected at 10 and 25 feet bgs were analyzed for gasoline oxygenate additives and total lead utilizing EPA methods 8260, and 6010, respectively The groundwater sample collected from boring SBI immediately north of the former gasoline UST was also analyzed for TPHg, BTEX, and gasoline oxygenate additives using the methods indicated above, as well as total lead using EPA method 200 7 The groundwater sample collected from boring SB2 north of the former UST was held at the laboratory pending the results of the first groundwater sample 4.3 Soil Analytical Results No petroleum hydrocarbon constituents were detected in any soil sample collected at 15 and 25 feet bgs from any of the three bonngs Soil samples collected at 10 feet bgs from borings SB 1, SB2 and SB3 contained TPHg at 630 ppm, 200 ppm, and 16 ppm, respectively Benzene, toluene, and ethylbenzene were detected only the sample from SBI at 10 feet bgs Xylenes were detected in the samples collected from 10 feet bgs in borings SB 1 (6 1 ppm) and SB2 (0 79 ppm) No gasoline oxygenate additives were detected in any sample Lead ranged from <30 ppm to 5 3 ppm Analytical results of soil samples collected during the investigation are aatakgrounamltuaboy\mportslsubs,usum ace