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TABLE 7: <br /> Contaminant Mass Estimates -2004 <br /> Speedy Foods <br /> 8200 N. Hwy 99 <br /> Stockton, Califomla <br /> Mass in Groundwater Prior to treatment <br /> Based on isoconcentratlon contours shown on attached maps (A-5 and A-6), and average of two samples <br /> immediately prior to initiating groundwater extraction. <br /> mass = (Volume in cu ft)(porosity)(Conc. in ppb)(E-9)(7.48 gal/cu ft)(8.34 Ib/gal)(0.4536 kg/ib) <br /> Thickness of aquifer is 20 feet; porosity is 0.30 <br /> Area Volume Average Mass of Mass of <br /> Contaminant (sq.ft.) (cu. ft.) Concentration Contaminant Contaminant <br /> (ug/1) (k9) (lbs) <br /> TPHG 10000+ ppb 1963 39270 50000 16.67 36.67 <br /> TPHG 1000-10k ppb 6362 127234 5500 5.94 13.07 <br /> TPFIG 100-1000 ppb 9503 190066 550 0.89 1.95 <br /> TPHG 50-100 ppb 11310 226194 75 0.14 0.32 <br /> Total Mass of dissolved TPHG in groundwater 23.6 52.0 <br /> MTBE 10000+ ppb 2969 59376 14000 7.06 15.52 <br /> MTBE 1000-10k ppb 9425 188495 5500 8.80 19.36 <br /> MTBE 100-1000 ppb 17357 347146 550 1.62 3.57 <br /> MTBE 10-100 ppb 20892 417831 55 0.20 0.43 <br /> MTBE 1-10 ppb 1 28039 L 560774 5.5 0.03 0.06 <br /> Total Mass of dissolved MTBE in groundwater 1 17.7 38.9 <br /> Mass in Groundwater September 2004 <br /> Based on isoconcentration contours shown on attached maps (A7, A-8). <br /> mass = (Volume in cu ft)(porosity)(Conc. in ppb)(E-9)(7.48 gal/cu ft)(8.34 Ib/gal)(0.4536 kg/lb) <br /> Thickness of aquifer is 20 feet; porosity is 0.30 <br /> Area Volume Average Mass of Mass of <br /> Contaminant {sq.ft.) {cu. ft.} Concentration Contaminant Contaminant <br /> (U9/I) (kg) {lbs) <br /> TPHG 10000+ ppb 1257 25133 27000 5.76 12.67 <br /> TPHG 1000-10k ppb 2827 56549 4200 2.02 4.44 <br /> TPHG 100-1000 ppb 6362 127234 550 0.59 1.31 <br /> TPHG 50-100 ppb 11310 226194 75 0.14 0.32 <br /> Total Mass of dissolved TPHG in groundwater 8.5 18.7 <br /> MTBE 10000+ ppb 0 0 14000 0.00 0.00 <br /> MTBE 1000-10k ppb 1885 37699 4200 1.34 2.96 <br /> MTBE 100-1000 ppb 13430 268606 550 1.25 2,76 <br /> MTBE 10-100 ppb 21991 439823 55 0.21 0.45 <br /> MTBE 1-10 ppb 1 30709 614181 5.5 0.031 0.06 <br /> Total Mass of dissolved MTBE In groundwater 2.81 6.2 <br /> luleburgconlmass.xls Page 2 of 2 <br />