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lu G) For the 0 to 5-foot vertical interval, the volume of remaining contaminated soil was estimated �- -... :..to be approximately^'6,4$5 ft' based on"geometric a�estimation of the contamination limits. ry -- _ Subtracting the volume of soil exca_.vated'from both..excavations _1 and 2 over the 5-foot vertical 'in#erval (approximately 1,610 #t3-and=765_ft3, respectively);-the net volume af_remaining _ contaminated:soil is estimated to be approximately 4,1.10 ft3 for�the vertical.interval of 0 to 5 - - feet. For the.5 to 10-foot vertical interval-;-the volume of remaining contaminated soil was estimated-, to beapproximately2,077 ft3 bad o sen"geometric-estimation 'of the contamination.limits Subtracting the volume of soil excavated for excavation-1 over the 5-foot vertical interval (the- lateral. thelateral.limit of contamination at this depth had narrowed laterally to the point where it excluded - the-limits of excavation 2), thenet volume.ofiremaini6d contaminated soil is estimated to be approximately 467 W for the vertical.interval of 5 to'.10-feet Y - MH) _Applying the soil density factor of.S7 pcf, and converting to Sl units, yields soil grass quantities of 161,796 kg and 18,384 kg, respectively. - - I) Soi! sample analyses:from the boring-logs-suggest .the fallowing average remaining contaminant concentrations for each vertical interval: 0 to 5 ft -TPHg: 10 mg/kg (rep�esents minimumlaboratory reporting limit) TPHd: 10 mg/kg (represents minimum laboratory reporting limit) Benzene: 0.005 mg/kg (represents minimum laboratory.reporting limit)— 5 i 10 ft -TPH 40 m-Ik TPHd: 129 mg/kg _ = Benzene .14 mg/kg - Applying these contaminant concentrations to the mass,quantities of remaining contaminated soil, tfie estimated mass of contaminants remaining are as-follows: - -_ - - Mass. TP�Ha. . `_ TPHd _ Benzene ft 161,796-k -l'.62-kg ,1.62 k 0.0008 k 0to5 - 5 to loft m -18,384 kg;r 0:74(kg ` . 2.37_kg- 0.026 kg _ g : s TUTAL - -4--'I$0,18D k =-2:3� 6C _:. 3�.99'kg ',- - - -<0A27 kg- J) g J) The estimated.mass quantities for-the excavated soil versus the contaminated soil remaining in.place are presented in.the table below. For comparison purposes,=the SI mass:values have also been converted into standard English values - :. - JJW GEOSCIENCES lnC.