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i TABLE 2 (cont.) GROUNDWATER STABILIZATION DATA January 26, 1994 I Volume Temperature Conductivity (gallons) pH (°F) (US/CII] x 100) MW-4 0 69 761 125 2 69 767 125 I4 69 765 129 6 69 76.2 1.31 I 8 70 754 130 10 70 756 129 IL-12 71 749 128 Iand 55 feet in Borings. B2 and B3 The contact between this silty clay layer and the underlying fine sand layer was encountered between 55 and 60 feet in Borings B2 and B3 A sandy silt interval was encountered from approximately 30 to 55 feet in Boring B4, and from approximately 35 feet to 55 feet in Boring B5 The contact between this sandy silt layer and the underlying silty clay layer was encountered between 55 and 70 feet The boring logs are included in Appendix A 4.2 Field Evidence of Soil Contamination Slight to strong gasoline-odors were detected in all soil borings by the field geologist during I drilling Organic vapors were detected in Boring Bland concentrations increased from 2267 parts per million (ppm) at 35 feet bgs to 2333 ppm at 50 feet bgs The level of organic vapors decreased from 2333 ppm at 50 feet bgs to 632 ppm at 65 feet bgs Organic vapors ' were detected in Boring B2 at 2249 ppm at 35 feet bgs The levels of organic vapors decreased from 2249 ppm at 35 feet bgs to 1711 ppm at 55 feet bgs Organic vapors in Boring B3 ranged from a high of 545 ppm at 45 feet bgs, decreasing to 0 ppm at 60 feet bgs Organic vapors in Boring B4 were detected at 4060 ppm at 15 feet bgs, decreasing to 1338 ppm at 60 feet bgs Organic vapors in Boring B5 were detected at 1548 ppm at 45 feet bgs, decreasing to 182 ppm at 55 feet bgs. ' 4.3 Soil Sample Analysis Petroleum hydrocarbons were detected in samples from all borings A summary of the analytical results for soil samples is presented in Table 3 TPH as diesel was detected only Oeo1-g-1 Add Sary lee Vrry.A-u R.p.rr QR2%4173 10