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• ESTIMATION OF PETROLEUM HYDROCARBONS <br /> AS DIESEL IN SOIL- 1996 <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 1996 <br /> 2 Average weight per cubic foot of soil= 110 lbs/cubic foot <br /> 3 Impacted soil as indicated on Figure 4 <br /> 4 For borings with multiple soil samples m an interval,the average concentration was utilized for <br /> calculation purposes <br /> Layers Vertical Interval <br /> A 0-9 feet(not sampled) <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 teet <br /> H 70-79 feet(not samplers) <br /> 5 Each layer is divided mto Ito 3 concentric volumes of average concentrations The inferred extent of <br /> the concentric volumes is illustrated on Figure 4 <br /> 6 Estimated impacted area for 1996 is based upon soil samples collected during dinning <br /> activities conducted in 1996 <br /> 7 Pounds of petroleum hydrocarbons=(volume)(average weight per cubic foot)(ppm/lEE6) <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 EIlipse=(a)(b)7c Where a=short radius b=long radius <br /> Volume=(Area of Ellipse)(depth) <br /> 1 <br />