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TABLE 7: Contaminant Mass Estimates-2004 Speedy Foods 8200 N. Hwy 99 Stockton,California Mass in soil Based on Concentrations from drilling investigations1999 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 r, x r2 x h) Concentration Contaminant ' Contaminant -- �- (m9/k9) - --(kg) _(Ibs) TPHG 10+ ppm A 2827 15 42411 30 57.9 127.4 TPHG 10+ oom B 2827 15 42411 20 _ 38.6 84.9 TPHG 1-10 ppm 11310 50 565486 5.5 141.5 311.3 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 1 2827 28 79168 5.5 19.8 43.6 MTBE 1-10 ppm B 707 10 7069 5.5 1.8 3.9 MTBE 0.1-1 ppm A 5027 55 276460 0.55 6.9 15.2 BE 0.1-1 ppm B 908 12 10895 0.55 0.27 0.60 VTBE_0.01-0.1 ppm A 5542 55 304797 0.0551. 0.763 1.678 TBE 0.01-0.1 ppm B 1257 15 18850 0.055 0.0471 0.104 otal estimated mass of MTBE in Soil = 30.4T- 66.81 Gross estimation in soil avg MTBE in MW1, VW1, SB1-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 Ib/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. tuleburgeontmass.xls Page 1 of 2