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kqKLEINFELDER Table 1 Summary of analytical results ` SAMPLE IDENTIFICATION 2/2/05 ANALYTE Ll-0" L2-0" L3-0" L4-0" L5-0" BGl-0" LI-PM ` TPH-D ND 0.36 ND ND ND ND 0.91 Cr+ ND ND ND ND ND ND ND UNITS Milli ams per a liter L ND =None Detected For detailed analytical results of the requested analytes, refer to the laboratory analytical reports ►� in Appendix B. CONCLUSIONS AND RECOMMENDATIONS 1. TPH-D was detected in one of five shallow soil samples collected from immediately beneath the parking lot base(L2-0"), with a concentration of 0.36 mg/l, and from the rinseate of the parent material (Ll-PM) with a concentration of 0.91 mg/l. Based on this data it appears TPH-D has the ability to leach from the parent material at relatively low levels (< lmg/1) under ambient conditions. The subsurface shallow soil sampling results appear to indicate that leachable TPH-D has impacted one of the five samples at concentrations at approximately 1/3d of the TPH-D concentration detected in the parent material. Please note however that this particular sample (L2-0") was noted in a trailer parking area and as such the TPH-D contaminant may potentially be related to incidental small spills of diesel powered trucks. Based on these sampling results and the concentrations of TPH-D detected, it is Kleinfelder's opinion that regulatory agencies would not require mitigation at these low levels. Based on the estimated depth to groundwater of approximately 20 feet bgs obtained from SJCFCD and the limited source material and reported TPH-D concentrations, it is Kleinfelder's opinion that there is a low probability of contaminants impacting groundwater from this source material. 2. Hexavalent chromium was not detected in any of the shallow soil samples collected from immediately beneath the parking lot base or in the rinseate of the concrete tile material included in the base. Based on the results, Kleinfelder does not recommend any additional r.. sampling and analysis for hexavalent chromium at the subject site at this time. 3. In accordance with the EHD permitting requirements, Kleinfelder recommends submitting a copy of this report to the San Joaquin County EHD. 4. Although the sampling results show relatively small concentrations of TPH-D leaching from the parent material, Kleinfelder recommends that no additional tile be brought onto the site as an aggregate base or other use in which leachable TPH-D may impact soil at the subject site. r 52495.E01/ST05R268/FB:Iv Page of m 2005,Kleinfelder, Inc. March 8,2005 r V