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'"..� IWOW Mr Michael J. Infurna Jr. P.G., S.R.E.H.S. February 14, 2006 Page 3 of-custody form, and placed into a cooler with ice for transport to Kiff Analytical in Davis California, a state-certified analytical laboratory. The soil samples were submitted under chain-of-custody protocol for analyses in accordance with the following approved analytical program: • Total petroleum hydrocarbons as gasoline (TPHg); benzene, toluene, ethylbenzene, and total xylenes (BTEX), and methyl tertiary butyl ether (MTBE) with U.S. Environmental Protection Agency (EPA) Method 826013, and • Total petroleum hydrocarbons as diesel (TPHd) and total petroleum hydrocarbons as motor oil (TPHmo)with EPA Method 8015M. Analytical results and PID readings for soil samples collected during this investigation are included in Table 1. Copies of the laboratory analytical reports and chain-of-custody forms are provided in Attachment 2. The field investigation was conducted in accordance with the soil boring permit requirements and SECOR's approved work plan. Auger cuttings and limited decon-fluids were containerized in a Department of Transportation (DOT)-rated drum and retained onsite pending the results of soil analyses. RESULTS Soil Profile The soils encountered in all four borings were similar. The top 8 inches consisted of aggregate base/gravel that was underlain by a silt horizon (silt, slit with clay, and clayey silt) to a depth of approximately 38 to 40 inches. The silt horizon was underlain by clay that extends to the top of a hard pan at 42 to 44 inches bgs. The hard pan was encountered in all of the borings and the shallow step out boring SB-1 B. No discoloration of the soils or hydrocarbon odors were apparent in the soils encountered. No elevated PID readings were measured when the soils were field screened with a direct reading instrument (Table 1). Soil Analytical Results Analytical results and PID readings are included in Table 1. TPHd and TPHmo were detected in all four soil samples at concentrations that range from 11 to 33 milligrams per kilogram (mg/kg) and 50 to 110 mg/kg, respectively. The maximum concentrations of TPHd and TPHmo were both measured in soil sample SB-1/SB-1@2'. TPHg, BTEX, and MTBE were not detected at concentrations equal to or greater than method reporting limits in any of the soil samples. The laboratory report narrative indicated that the TPHd detected did not display a typical diesel chromatogram. The narrative stated..."Hydrocarbons reported as TPH as diesel do not exhibit a typical chromatographic pattern...(for all samples). These hydrocarbons are higher boiling than typical diesel fuel." SECOR contacted Kiff Analytical for further clarification. Kiff indicated the higher boiling points were more typical of asphalt than diesel hydrocarbons. Copies of the chromatograms for all four samples, the diesel standard, and the asphalt standard are included in the laboratory report. IAPG&E\report\Final Phase 11 report.doc