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CONTAMINANT MASS CALCULATIONS <br /> QUANTITY REMOVED IN SOIL AND GROUNDWATER <br /> 8960 W Walnut Grove Rd, Thornton, CA <br /> CONTAMINANT MASS CALCULATIONS <br /> Barnyard <br /> Mass in soil prior to remediation. <br /> Based on average concentration of soil samples collected from beneath USTs and from borings <br /> in vicinity of USTs Excavation (HB1-HB6, HA1-HA4, SB1-SB5, MW1-MW4) <br /> Only detectable concentrations used in averaging, ND results ignored <br /> mass = (Volume of impacted zone)(soil den sity)(Average Concentration)(E-6), <br /> Volume in cu ft , thickness of impacted zone is 14' <br /> Volume of impacted sod (140570 cf) minus UST pit (15540 cf) = 125030 cf <br /> Soil density assumed 45 5 kg/cu ft (100lb/cu ft}, <br /> Total mass of TPHG in Soil = 12503OF 6340 1 360671 79348 <br /> Avera a Concentration (mg/kg) = 63401 <br /> Total mass of TPHD in Soil = 1 1250301 4600 1 261691 57571 <br /> Avera a Concentration (mg/kg) = 46001 <br /> Total mass of Benzene in Soil = I 125030 171 971 21 4 <br /> Avera a Concentration (mg/kg) = 1 7 <br /> Total mass of Toluene in Soil = 1 1250301 357 1 2031 44 7 <br /> Avera a Concentration (mg/kg) = 3 6 <br /> Total mass of Eth (benzene in S1 1250301 1093 1 6221 1368 <br /> [Average Concentration (mg/kg) = 10 9 <br /> Total mass of Xylenes in Soil = 1 1250301 6166 1 35081 771 7 <br /> Avera a Concentration (mg/kg) = 61 7 <br /> Total mass of MTBE in Sod = 1 1250301 763 1 4341 95 5 <br /> Avera a Concentration m Ik = 7 6 <br /> contmass soilla As <br />