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Table 1 Soil Sample Results Pacific Gas and Electric McDonald Island Compressor Station C-51 Tank Site Investigation and Soil Removal Sample Sample Parameters Primary/ Depth Soil Boring Contingency (feet bgs) TPH-g TPH-d TPH-mo Benzene Toluene Ethylbenzene Xylenes Moisture RWQCB ESL for Shallow Soil with Residential Land Use 83 83 83 0.044 2.9 2.3 2.3 - USEPA RSL for Residential Soil -- -- -- 1.1 5000 5.4 630 - Units mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg % 1.5-2 NA NA NA NA NA NA NA NA C51-SB13 Contingency 3.5-4 NA NA NA NA NA NA NA NA 5.5-6 0.55U 14 190 NA NA NA NA 8.60 7.5-8 0.54U 5AU 27U NA NA NA NA 6.80 1.5-2 NA NA NA NA NA NA NA NA C51-SB14 Contingency 3.5-4 NA NA NA NA NA NA NA NA 5.5-6 0.57U 5.7U 28U NA NA NA NA 11.9 7.5-8 0.57U 5.7U 29U NA NA NA NA 12.8 C51-SB15 Contingency 1.5-2 NA NA NA NA NA NA NA NA 2-2.5 NA NA NA NA NA NA NA NA C51-SB16 Contingency 3.5-4 NA NA NA NA NA NA NA NA 5.5-6 NA NA NA NA NA NA NA NA 7.5-8 NA NA I NA NA NA NA NA NA 1.5-2 NA NA NA NA NA NA NA NA C51-SB17 Contingency 3.5-4 NA NA NA NA NA NA NA NA 5.5-6 NA NA NA NA NA NA NA NA 7.5-8 NA NA NA NA NA NA NA NA 1.5-2 NA NA NA NA NA NA NA NA C51-SB18 Contingency 3.5-4 NA NA NA NA NA NA NA NA 5.5-6 NA NA NA NA NA NA NA NA 7.5-8 NA NA NA NA NA NA NA NA Notes: - Not established % Percent bgs Below ground surface ESL Environmental Screening Level mg/kg Milligrams per kilogram NA Not analyzed RSL Regional Screening Level RWQCB Regional Water Quality Control Board TPH-d Total petroleum hydrocarbons as diesel TPH-g Total petroleum hydrocarbons as gasoline TPH-mo Total petroleum hydrocarbons as motor oil U Not detected at the stated reporting limit USEPA United States Environmental Protection Agency Highlighted results indicate concentrations above the respective screening level. Table 1 MDI Sample Results.xls ARCADIS Page 2 of 2