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4.2 Analytical Results of Soil Samples <br /> No TPH as gasoline, benzene, toluene or ethylbenzene was detected in the soil samples. <br /> _ Xylenes were detected only in MW1-10 at 0.0054 mg/kg (parts per million, ppm, the <br /> detection limit is 0.005 ppm). The laboratory report and chain-of-custody are included in <br /> Appendix C. <br /> 4.3 Depth to Groundwater <br /> On October 26, 1994, groundwater depth was measured at 5.98 feet below surface grade <br /> _ (bsg). On December 1, 1994, groundwater depth was measured at 6.44 bsg. The depth-to- <br /> water is approximately five feet higher than expected, based on the San Joaquin County <br /> Flood Control map for Fall 1993. <br /> 4.4 Analytical Results of Groundwater Samples <br /> No TPH as gasoline or BTE&X were detected in groundwater samples from MW-1. The <br /> laboratory reports and chains-of-custody are included in Appendix C. <br /> 5.0 CONCLUSIONS <br /> Only a small concentration of xylene (0.0054 ppm) was detected in one soil sample from <br /> MW1 (at a depth of 10 feet). This is only 0.0004 ppm over the method detection limit, this <br /> small concentration of xylene could be due to laboratory contamination, instrument <br /> calibration or sampling procedure. Furthermore, it is very unlikely that such a minute <br /> concentration, if present, could adversely impact groundwater. <br /> It does not appear that impacted soil is present at the site. Therefore, further investigation <br /> is not warranted. <br /> No petroleum hydrocarbons have been detected in two groundwater samples from MW-1. <br /> Therefore, it does not appear that groundwater has been impacted at the site. We <br /> recommends abandonment/destruction of MW-1 subject to approval by the PHS/EHD. After <br /> MW-1 has been properly abandoned, we recommend site closure. <br /> 6.0 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily <br /> exercised by environmental consultants practicing in this or similar localities. The findings <br /> were based upon analytical results provided by an independent laboratory. Evaluations of <br /> Ccobgi.+l Audi,Scrv—1- 6 <br /> P,I,*,Pl—PIER'102 Jl o.1994 <br />