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Mr Mike Infurna March 27, 2006 CAMBRIA Sail Screening Soil samples were screened using a photo-ionization detector (PID) Samples were selected for analyses based on PID readings, evidence of discoloration, stratigraphic location, depth to groundwater, and the collection depth of previous samples containing hydrocarbons Encountered Lithology Lithology encountered in each boring consists primarily of sand, silty sand, and sandy silt to a total explored depth of 40 fbg Laboratory Analyses Twenty soil and nine grab-groundwater samples were submitted for the following laboratory analysis • TPHg by modified EPA Method 8015, a BTEX, fuel oxygenates MTBE, tert-butyl ether (TBA) di- isopropyl ether (DIPE) tert-amyl methyl ether (TAME) and ethyl tert-butyl ether (ETBE) by EPA Method 826013, 1,2 dichloroethane (1,2-DCA), ethylene dibromide (EDB) and ethanol by EPA Method 8260B Sail Disposal Soil uutt ngs were stored on-site Pending landfill approval, the cuttings are scheduled to be removed by Integrated Waste Management and transported to a Chevron approved facility Groundwater Depth Groundwater was encountered from approximately 18 fbg, 22 fbg and 17 fbg in soil borings B-5 through B-7,respectively HYDROCARBONS IN SOIL No TPHg, benzene, DIPE, ETBE, TAME, TBA, 1,2-DCA, EDB or ethanol was reported in any of the twenty soil samples analyzed MTBE was reported only in one of twenty soil samples The soil sample B-5-S-38 had a reported concentration of 0 003 mg/kg MTBE The results of this investigation indicate that remaining hydrocarbons are limited to the area near the UST pit It is likely the 1991 over-excavation activities effectively removed the majority of hydrocarbon impacted soil Detailed cross-sections with estimated TPHg and benzene concentrations in soil are presented as Figures 6 and 7, respectively Soil sample results are presented on Table 2 4