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TABLE 7: Contaminant Mass Estimates -2004 Speedy Foods 6200 N. Hwy 99 Stockton, California Mass in soil Based on Concentrations from drilling investigations 1999 to 2004 mass = (Volume of impacted zone)(soil density)(Average Concentration)(E-6); Volume in cu.ft.; thickness of impacted zone is 7 ft. 5-12 ft. deep) Soil density assumed 45.5 kg/cu. ft. (100lb/cu.ft.); Area (sq.ft.) Height Volume(cu.ft.) Average Mass of Mass of Contaminant (pi x r, x rZ) (feet) (pi x r1 x rz x h) Concentration Contaminant Contaminant (mg/kg) k lbs TPHG 10+ p m A 28271 151 42411[- 301 57.9 127.4 TPHG 10+ ppm B 28271 151 424111 2OF 38.6 84.9 TPHG 1-10 ppm 113101 501 5654861 5.51 141.5 311.3 Total estimated mass of TPHG in Soil= 238.0 523.6 MTBE 10+ppm 154 10 1539 11 0.8 1.7 TBE 1-10 ppm A 2827 28 79168 5.5 19.8 43.6 TBE 1-10 ppm B 707 10 7069 5.5 1.8 3.9 MTBE 0.1-1 pprn A 5027 55 276460 0.55 6.9 15.2 TBE 0.1-1 ppm B 908 12 10895 0.55 0.27 0.60 TBE 0.01-0.1 ppm A 5542 551 304797 0.0551 0.763 1.678 TBE 0.01-0.1 ppm B 12571 151 188501 0.0551 0.047 0.104 [Total estimated mass of MTBE in Soil Gross estimation In soil avg MTBE in MW1, VW1, S81-SB3 is 1.5 ppm area of impact is radius of 40 feet or about 5026 sq ft impacted from below tank pit to groundwater(15-70 feet),or 55 feet volume is 276460 cu ft,with density of 100 lb/cu ft mass is 41 Ib MTBE avg TPHg in soil over same area is 18.5 ppm mass is 511 Ib Free Product: Prior to pumping, average thickness of 0.29-foot of free product with an estimated radius of 10 feet, 30%porosity, density of gasoline 0.80, 15%of gasoline comprised of MTBE Estimated 205 gallons of free product, or 1365 pounds of gasoline and 205 pounds of MTBE in the free product. Note that an estimated 180 gallons of product/water mix removed through passive skimmer and bailing before pump and treat began; Estimated 10-20 gallons of product removed during initial days of pump and treat. tuleburgcontmess.xls Page i of 2