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T CION ��INC. Mr. Michael Carr August 28, 1997 Page 3 of 4 LABORATORY ANALYTICAL RESULTS Two soil samples were collected from each borehole, as described above. The samples collected at approximately 11.5 feet bgs were submitted to Excelchem Environmental Labs (EEL) of Roseville, California, a California-certified hazardous waste analytical laboratory, for determination of TPH-HO concentration by EPA Method 3550 and 8015 modified, and PCBs by EPA Method 3550 and 8080, as necessary. The soil samples collected from 11.5 feet bgs were analyzed first to determine if hydraulic oil had leaked to this depth from the hydraulic lifts. TPH-HO was measured at non-detectable levels in samples collected from boreholes BH-10 through BH-12, and to 544 parts per million (ppm) in the sample collected from borehole BH-8. Based on the BH-8-11.5 TPH-HO sample result of 544 ppm, EEL was instructed to analyze sample BH-8-11.5 for PCBs, and sample BH-8-14.5, collected from the same borehole at 14.5 feet bgs, for TPH-HO. No detectable concentrations of PCBs were measured in sample BH-8- 11.5, and no detectable concentrations of TPH-HO were measured in sample BH-8-14.5. Table 1, Attachment A, summarizes the soil analytical results from this supplemental investigation, and Attachment C presents the EEL Analysis Reports. CONCLUSIONS Based on the findings of this limited subsurface investigation, soil analytical results indicate that releases of hydraulic oil from the hydraulic lifts in the area of BH-8 and BH-9 have occurred. The soil beneath the hydraulic lifts is impacted with low concentrations of TPH-HO to less than 11.5 feet bgs in the southeastern hydraulic lift area, and to less than 14.5 feet bgs in the northwestern hydraulic lift area. No detectable concentrations of PCBs were measured in borehole BH-8. { E i I i; H'.VROIECTS LERTSCA ON DSOIL.DFT