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C A M B R I A Mr Harlin Knoll April 5, 2005 Over-excavation Cambria proposes to conduct aver-excavation in the gasoline UST excavation shown on Figure 2, based on preliminary analytical data following the UST, dispenser, and piping removal Cambria will attempt to remove impacted soil in these areas to the extent that is feasible Cambria estimates that we will excavate the outlined areas (Figure 2) to approximately 19 feet below grade (5 feet deeper than the existing excavation), generating approximately 100 to 150 cubic yards of soil The final extent of over-excavation will be based on field observations and photo-ionization detector measurements Soil Sampling and Chemical Analyses Cambria will collect soil samples below the original UST samples from the bottom of the excavation at its final depth to document soil conditions Soil samples will be analyzed ter total petroleum hydrocarbons as gasoline, benzene, toluene, ethylbenzene, xylenes, and fuel oxygenates by EPA Method 8260B Cambria will request a standard two-week turn-around time for the laboratory results Soil Disposal Soil generated during over-excavation activities will either be stockpiled on site or directly loaded into trucks for transportation to Allied Waste's Forward Landfill in Manteca, Calitorma under an existing profile • Report Preparation Following the receipt of analytical results from the laboratory, Cambria will prepare a written report, which will include field procedures, laboratory results, and conclusions This report will document both the initial UST, dispenser, and product piping removal and the ! subsequent over-excavation activities The scope of work described in this work plan will be performed under the supervision of a professional geologist SCHEDULE Cambria proposes to conduct these over-excavation activities on April 7, 2005, with approval from SJCEHD r 0 '4 2