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� M � 1 �Claytori 4. GENERAL FINDINGS Presented below are the general findings associated with the fill material delineation at the Site. 4.1. LITHOLOGY ' The fill material in the western portion of the Site is generally a soft brownish clay with silt, and was identified as fill by the presence of foreign matter(e.g., brick fragments, glass, plastic). The fill thickness encountered was up to 10.5 feet. The native soil beneath the fill material at the site appeared to be a brown silty clay(topsoil), underlain by a light tan to light brown silt/siltstone. The interface between fill material and native soil was marked by the presence of rootlets in the soil. Soil boring logs are presented in Appendix A. 4.1.1. Groundwater Occurrence Groundwater was not encountered during the soil borings. Based on Clayton's i experience, groundwater in this vicinity of the Site is generally greater than 100 feet below ground surface. ' 4.2. LABORATORY ANALYTICAL RESULTS Soil samples were tested in accordance with the analytical program described in Section 3.4. Analytical results for diesel/crude oil range petroleum hydrocarbons, VOCs, and metals are presented in Tables 1, 2 and 3, respectively, and certified analytical results are presented in Appendix B. The analytical results for TCLP analysis of B2 at 4.0'—4.5' are included in Table 1. No detections of semi-volatile organic compounds occurred in the soil samples analyzed. ' Diesel/crude oil range petroleum hydrocarbons were detected in all soil samples. The concentrations reported ranged from 7 mg/kg(B5 @ 2.0' -2.5') to 3,700 milligrams per kilogram(mg/kg, B2 at 2.0' - 2.5'). TPH soil concentrations are shown on Figure 3. TCLP diesel/crude oil range petroleum hydrocarbons were detected at 3 milligrams per liter(mg/L)in soil sample B2 at 4.0'- 4.5'; however, TCLP gasoline range organics in this sample were below detection limits. The only VOC detected in the three samples analyzed was acetone at 0.15 mg/kg in sample B2 at 4.01 - 4.51. The Cam 17 metals detected in all three samples analyzed were generally at low levels. 5. DISCUSSION The ten soil borings advanced in the western portion of the site during this investigation were placed in order to delineate the vertical extent of the fill material and to assess if the fill is impacted with petroleum hydrocarbon. The vertical extent of the fill was established, as native soils were encountered below the fill in all borings. Diesel/crude ' oil range petroleum hydrocarbons were detected at concentrations ranging from 3,700 SAESTROIECTS\3004�%Shdl Tracy eery Station RWn\I000 .Dpi 3