ARCHIVED REPORTS_ENVIRONMENTAL SITE ASSESSMENT

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be associated with two concrete patches where SV-25 and SB-112 were located. At both SV-25 and SV 24, petroleum hydrocarbons in the C11-22 (diesel-fuel) range exceeded the general regulatory standard of 1,000 mg/kg. On Figure 3, SV-25 is associated with the concrete patch in the southern part of the building, and SV-24 and SB-112 are associated with the concrete patch farther to the north. Outside the building the petroleum impacts to soil (below regulatory standards) appear to be associated with the railroad spur and with the two UST graves at the southeast corner of the building. ♦ VOCs were detected only in one of the 54 soil matrix samples analyzed. That sample, SV-5 (2'), was located near an UST grave at the southeast corner of the building. The sample contained low concentrations of ethylbenzene, toluene, and xylene(s) well below regulatory reporting levels. The remaining 53 soil matrix samples were below laboratory detection limits for all VOC compounds tested. ♦ Select soil samples from the shallow soil vapor samples (SV-5 and SV-7), soil borings (SB-101, -103, -104, -106-, -109, and -110), and groundwater borings (GW-1, -2 and - 3) were analyzed for semi-volatile compounds, organophosphorus pesticides, chlorinated pesticides, chlorinated herbicides and CAM 17 metals (see Table 10). None of these analytes was detected at concentrations above laboratory detection limits (or above levels of regulatory concern in the case of the metals analysis). ♦ There are impacts to groundwater above USEPA drinking water Maximum Contaminant Levels (MCLs) of 1 µg/L by benzene (21.4 µg/L) and the MCL of 5 µg/L by 1,2- dichloropropane (14.8 ug/L) beneath the septic system at the eastern border of the property. Limited Phase II Environmental Site Assessment Report Pinnacle Environmental,Inc. 248 Industrial Avenue,Stockton,CA 95206 Page 16