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Page 3 <br /> 3.3.2 Estimate with Existing Sample Data <br /> Approximately 66 tuft of soil wouldtremain between the 30 inch auger <br /> holes. This soil will be surrounded by cement onlfour sides, hard pan clay on <br /> the bottom and a pea gravel with a. concrete cap on the top. In short the <br /> remaining soil would be encapsulated. i� The average concentration of <br /> contaminants is shown in Table 1 "Residual Contamination",{Reference soil <br /> sampling by Tom Vogel July 1, 1993). <br /> Table 1 "Residual Contamination" <br /> .r <br /> Soil 66 cuft @ Benzene Toluene Ethyl l',Total TPH <br /> 115#/cu =7590# Benzene Rylefie ft Gasoline <br /> Average (ppb) 297 1234 82,535 1'508,339 16,467 <br /> Concentration <br /> Estimated 1.02 4.25 284.17 1750.21 56.7 <br /> Residual (grams) <br /> t <br /> a <br /> 3.3.3 Estimate with additional site specific sampling data <br /> To augment the aforementioned soil estimations, TVG is proposing <br /> additional samples be secured during excavation. Three types of samples <br /> would be secured. <br /> 4 <br /> 1. Samples will be taken to confirm removal. <br /> 2. Samples will be taken where a soil portion cannot be removed and <br /> used to characterize potential petroleum a residual. <br /> 3. Samples will be taken to provide data for modeling: <br /> a. Total Organic Carbon <br /> { b. Soil Porosity i� <br /> C. Soil Density <br /> d. Soil Moisture b <br /> '! e. Other As Specified by Contractor(See attached Secor Proposal) <br /> " I <br /> P.D.Boa 7114,Battery St..,San Franc]", Califomia 94120-7114 Mane:(41-79 44-7-10W Telex.279046 Fax (41-9 445-1628 <br /> i <br /> i. 0 <br />