Laserfiche WebLink
Given'the following assumptions, <br /> Q • The average concentrations of the:constituents of concern are assumed to be <br /> Cj distributed uniformly throughout the volume of impacted soil j <br /> • Soil density = 110'!p66rid (lb)Icubic,foot; and <br /> I it 1 part per million 3(ppm) = 1 pound contaminant per 1 million pounds of soil <br /> the hydrocarbon mass in soil prior to remediation.is calculated as follows: <br /> TPHg upper cylinder (25.132)ft--sei)1(110.Ib-se4)(3,163 lb TPHg) = 8,744 Ib TPH-as-gasoline <br /> ftz:seil) {100. -sei)) <br />[ Benzene upper cylinder= (25,132)W---'&41(110 W-seil)(9.7 Ib benzene) = 26.9 Ib Benzene <br /> j <br /> ,{100 I•b-seii) . . ' <br /> TPHg lower cylinder= (98,96OW-s4(11 ib, seil)(2.5 Ib TPHg) = 27.2 Ib TPH-as-gasoline <br /> (106 ) <br /> Benzene upper cylinder J98,960)#3:60410 10_U�-seit)(02 Ib benzene) = 2.0 Ib Benzene <br /> (#1�seit) (106 fb seil) <br /> TPHg total mass = 8,744 Ib + 27.2 lb:- 8;771.2 pounds <br /> Benzene totalmass = 26.9 Ib +-2.O.-Ib"--.:28.9 poundst- <br /> As indicated in the mass calculati6's, approximately 99.7% of the TPH-as-gasoline mass and <br /> 93.1% of the benzene mass in soil prior to remedial activities was concentrated between 10 <br /> } and 30 feet bgs. <br /> 3.1.2 Petroleum Hydrocarbon Mass in Soil (Post'-Remediation) _ <br /> According to ENSR, approxirhately one year of soil vapor extraction system removed over <br />[ 7,000 pounds of gasoline hydrocarbons from the subsurface. Based on the analytical results <br /> I[ <br /> from the'post=SVE, confirmatiori�soil boring drilled through the former UST source area <br /> (Table 5), SVE was effective lin remediating all of the benzene, all of the TPH-as-gasoline in <br /> ':inti i i. .. <br /> the lower cylinder, and most of.the TPH-as-gasoline in the upper cylinder. 1 <br /> I <br /> J 1 <br /> - II <br /> 1 <br /> 12 <br />