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Linda Turkatte of the San Joaquin County Public Health Services Environmental Health Division <br /> provided verbal approval to spread the 25 cubic yards of excavated soil in an open area previously <br /> used to aerate gasoline contaminated soil. <br /> A copy of the excavation sampling report was submitted to and reviewed by the Environmental <br /> Health Division. Ms. Turkatte has requested a mass fuel oil calculation to determine the amount <br /> of fuel oil present in the excavated soil spread at the site and in the soil remaining in the backfilled <br /> excavation. This letter report presents Kleinfelders calculations, assumptions, and estimate of fuel <br /> oil present in the soil based on the results of the excavation and stockpile sampling. <br /> Fuel oil was detected at 51 mg/kg in the stockpiled soil and at 51 mg/kg at the bottom of!the <br /> excavation. The volume of excavated soil is known (25 cubic yards), therefore it is possible to <br /> calculate the fuel oil mass in the excavated soil. The assumptions and calculations for the fuel oil <br /> mass in the excavated soil are as follows: <br /> FUEL OII.MASS EXCAVATED SOIL <br /> Assumptions: <br /> 1. Soil stockpile: 675 cubic feet(ftp) <br /> 2. Average soil composition: Silty sand <br /> 3. Average specific gravity: G = 2.66 <br /> 4. Average void ratio: 1 = 1.25 <br /> S. Average porosity: n = 0.56 or 56% <br /> 6. Density of soil. p = 110 (7hy?) <br /> 7. kg/lbs conversion: I kg = 2.2046 lbs <br /> Calculations: <br /> Volume of soil: <br /> n = 0.56 Porosity <br /> Vr = 675 (ftp) Total affected sail volume <br />{ KI = n(Vd = 378 (ftp) Total void volume in soil <br /> VS = Vr- Vv = 297 (ft 3) Volume of affected soil <br /> Mass of Affected Soil Stockpile- <br /> P(V) <br /> tock ile-PVV) <br /> msorr =110( Ib (297 ft3k .0kg <br /> = 14,819.0(kgs,,) <br /> l � <br /> Y-2-04-61b) <br /> msorr = 14,819 (kgs-;) <br /> ! i <br /> a � <br /> i <br /> 24-220152-GOO/CR38-28 (1994) Page 2 of 5 June 7, 1994 <br /> Copyright 1994 Kieir&lder,Inc. <br /> KLEINFELDER 2240 Northpoint Parkway, Santa Kosa, CA 05407 (707) 571-1883 <br /> L <br />