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Adsorbed Diesel Mass-Volume Calculations GREWAL'S MARKET ' 4100 East Fremont Street, Stockton CA Assumptions: 1 Utilizing Figures b, Sand 10,the mass distribution of diesel concentrations greater than 10,000 mg/kg can be approximated utilizing the equation for a coned-ellipse shape. ' The volume of an coned ellipse can be calculated by the formula: V..�=(long diam.)(short diam.)(0.7854)(1A height), where"a"is the long diameter of the coned ellipse, "b"is the short diameter and"c"is the height. The mass distribution of gasoline concentrations greater than 1,000 mg/kg, above 40 feet bsg, can be ' approximated utilizing the equation for a cylindrical ellipse. The volume of a cylindrical ellipse can be calculated by the formula: Vwne=(long diam.)(short diatn.)(0.7854)(height),where"a"is the long diameter of the cylindrical ellipse,"b" is the short diameter and"c"is the height. ' The mass distribution of diesel concentrations greater than 1,000 mg/kg below 40 feet bsg, and the mass distribution of diesel concentrations greater than 1.0 mg/kg,can be approximated with a volumetric equation utilizing thickness and area A(determined by Autocad drawing aprogram). ' The volume can be calculated by the formula: V,•n•=(Autocad-determined area)(thic"ess). ' The average TPH-d concentration was utilized for diesel-impacted area greater than 10,000 milligrams per kilogram (mg/kg), for the diesel-impacted area greater than 1,000 mg/kg and for the diesel-impacted area greater than 1 mg/kg; ' the average was calculated by summing the detected TPH-d concentrations for each area and dividing by the total number of detections. The average TPH-d concentration for the area greater than 10,000 mg/kg was calculated to be 11,500 mg/kg;the average TPH-d concentration for the area greater than 1,000 mg/kg was calculated to be 3,300 mg/kg;the ' average TPH-d concentration for the area greater than 1 mg/kg was calculated to be 155 mg/kg. 1 Advanced GeoEnvironmental,Inc. 1