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Mass of Fuel Oil in Stockpile: <br /> 1. Estimated TPH mass in affected soil based on average concentration of 51 mg/kg. <br /> TPH-„o = 5.1(10"s)kg/kgdo;t <br /> mrPH = m1eu(TPH-a„d _[14,819.(kgso,d][5.1(10-s)(kg of TPH1kgso;t�][2.2046 lb j <br /> kg <br /> mrPH = 1.67(Ib) Pounds of TPH in affected soil based i�on <br /> given assumptions <br /> FUEL OIs.MASS REMAINING IN BACKFILLED EXCAVATION <br /> The volume of impacted soil remaining beneath the excavation, cannot be estimated as easily as <br /> the excavated soil, however, some assumptions can be used to estimate the volume. Fuel oil was <br /> detected a the bottom of the 10 foot long by 5 foot wide excavation, but the four sidewall samples <br /> were non-detect. Therefore, it is assumed that the surface area of the impacted soil is 10 feet by 5 <br /> feet. Soil was excavated to a depth of I 1 feet. The fuel oil mass is calculated for the surface area <br /> from a depth of I I to 15 feet. <br /> Assumptions: <br /> 1. Soil volume: 10'x 4'x 5' = 200 (ft3) ri <br /> 2. Average soil composition: Silty sand <br /> 3. Average specific gravity: G = 2.66 <br /> 4. Average void ratio 1 =.8 <br /> 5. Average porosity: n =.45 or 45% <br /> 6. Density of soil: p�3 � <br /> 0(Iby?) � <br /> 7. kg/lb conversion: 1 = 2.2046 b) <br /> Volume of soil: <br /> J <br /> n = 0.45 Porosity <br /> Vt = 10 ft long x 5 ft wide x 4 ft deep <br /> Vt = 200 ft, Total affected soil volume 4 <br /> V,, = n(Vd = 90 (W) Total void volume in soil <br /> VS = Vt- V, = 110 (ft3) Volume of affected soil <br /> Mass of Affected Soil Excavation:. <br /> msoa=P(V) <br /> lb ft, 1.0(kg) <br /> msail =130 3)110 }( <br /> ft / 2.2046 Ib <br /> t <br /> jnso,l .— 6,486 nCgsa;d <br /> 24-220152-GOO/CR38-28 (1994) Page 3 of 5 June 7, 1994 <br /> Copyright 1994 Kleinfelder,Inc. � <br /> KLEINFELDER 2240 Northpoint Parkway, Santa Rosa, CA 95407 (707) 571-1883 <br />