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ESTIMATION OF PETROLEUM HYDROCARBONS <br /> AS DIESEL IN SOIL- 1994 <br /> Beacon Station No 695 <br /> 900 South Cherokee Lane <br /> Lodi, California <br /> Assumptions <br /> 1 Inferred lateral and vertical extent of impacted soil is illustrated on Figure 3 The resulting <br /> drawings estimate what was on site as of 1994 <br /> 2 Average weight per cubic foot of soil= 110 lbs/cubic foot <br /> 3 Impacted soil as indicated on Figure 3 <br /> 4 For bonngs with multiple soil samples in an interval,the average concentration was utilized for <br /> calculation purposes <br /> Layers Vertical Interval <br /> A 0-9 feet <br /> B 10-19 feet <br /> C 20-29 feet <br /> D 30-39 feet <br /> E, 40-49 feet <br /> F 50-59 feet <br /> G 60-69 feet <br /> H 70-79 feet <br /> 5 Each layer is divided into Ito 3 concentric volumes of average concentrations The inferred extent of <br /> the concentric volumes is illustrated on Figure 3 <br /> 6 Estimated impacted area for 1994 is based upon soil samples collected during drilling <br /> activities conducted in 1994 <br /> 7 Pounds of petroleum hydrocarbons=(volume)(average weight per cubic foot)(ppm/l EE6) <br /> Note (ppm=parts per million=milligram per kilogram=mg/Kg) <br /> 8 Volumes estimated by calculating area of impacted zones elliptical area method and then multiplying the <br /> area by the depth of the layer(9feet) Area of Ellipse=(a)(b)ic Where a=short radius b=long radius <br /> Volume=(Area of Elhpse)(depth) <br /> 1 <br />