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Table 4 <br /> Estimate of Contaminant Mass in Soil Removed from Site <br /> Average Concentration of Total Contaminant Mass (kg) <br /> Compound at Location <br />' (mg/kg for TPH, µg/kg for BTEX) <br /> Tank 3' Tank 4Z Tank 3 Tank 4 <br />' TPH-g 597 ND (5)3 500 91 <br /> TPH-d 231 4474 194 817 <br /> TPH-k NM 1745 318 <br /> TPH-o 2885 506 241 91 <br /> Benzene 85' ND (5)3 007 009 <br /> Toluene 1,132 225 095 04 <br /> Xylenes 6,481 53365 057 98 <br /> Ethylbenzene 723 3145 006 057 <br /> Total 937 1246 <br /> 'Average Concentration in Stockpiled soil sampled on 1/25/90 <br /> 2Average Concentration detected in Boring B-1 soil samples from 10-20 ft bgs and base <br /> ' of excavation <br /> 'TPH-g, TPH-o and BTEX were not detected in B-1 or base of excavation Average <br /> concentration assumed to be '/z the detection limit <br /> 4Average concentration of TPH-k detected in B-1 soil samples from 10-20 ft bgs <br /> r5Concentration assumed to be equal to two times the residual concentration in side wall <br /> samples (see Table 7) Measured concentration in limited number of soil samples from <br /> excavated soil volume less than this amount <br /> 'TPH-o was not detected in B-1 soil samples or base of excavation Average <br /> concentration assumed to be '/z the detection limit <br /> 'No Benzene was detected in the stockpiled soil Concentration assumed to be equal to '/2 <br /> ' the detection limit of 170 ug/kg <br />