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' PHASE VI SUBSURFACE INVESTIGATION Sae Code 2163 Montgomery Ward Auto Service Center 5400 Pacific Avenue Stockton, CA 6.0 DISCUSSION ' 6 1 SOIL SAMPLES No TPH-g or BTEX were detected in any of the soil samples collected from boring MW-5 Only one sample from boring MW-6 (MW-6 @ 49-50 5') contained detectable concentrations of toluene (0 0052 ppm) (see Table 8) In borings MW-3 and MW-4, TPH-g and/or benzene, ethylbenzene and xylenes were detected in ' samples obtained between 44-50 5' The highest TPH-g (670 ppm) and BTEX were detected in the sample obtained from boring MW-4 at 49-50 5 feet bgs (see Table 8) ' HVOC testing of soil samples collected between 44 and 50 5 feet bgs show that only methylene chloride and 1,2-DCA were detected (see Table 6) It is EAI's opinion that the presence of methylene chloride results from laboratory contamination, since methylene chloride is a common laboratory contaminant 1,2-DCA was only detected in soil samples obtained from ' borings MW-3 and MW-4 at concentrations ranging from 0 053 and 0 060 ppm (see Table 6) No TPH-G, BTXE or HVOCs were detected in the trip and equipment blanks 6 2 GROUND WATER TPH-G, BTEX and 1,2-DCA were detected in the ground water samples collected from monitoring wells MW-3 through MW-6 (see Table 6) For specifics, see EAI, 1995B report ' 7.0 LIMITATION Our professional services have been performed using that degree of care and skill ordinarily exercised, under similar circumstances, by reputable environmental consultants practicing in this or similar localities No other warranty, expressed or implied, is made as to the professional advice contained in this report ' Respectfully submitted, ENVIRONMENTAL AUDIT, INC ' Christopher P R d'Sa R E Aw �F Protect Geologist �- Z°c' a h URAMOT0 V � No 4248 Frank S Muramoto, R G �fy,� 9, Senior Geologist Fay c�>.ti�Q ' Project No 1232 8 ENVIRONMENTAL AUDIT, INC