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SG <br /> CfllnT.�Pi r, iva.. ,} <br /> October lr,. 19 (8816EB) 6 <br /> _ f <br /> TABLE 2 <br /> _ SOIL VAPOR 8URVEY R1:8vT_iS <br /> (Results in parts per millinn by volume) <br /> August 1989 <br /> 1 -- <br /> Tata!Yoiadla <br /> Dept Paealavm Ya4a!4�lailla <br /> No. (W) fttromum <br /> of{tam le rocarbaza Hydrom-bons <br /> 3 Mrd <br /> CSL-i $ <br /> € GSL ? g6 <br /> 0. D <br /> t <br /> M-3 a 2 0.S <br /> CSL-4 6 <br /> 2.7 <br /> 2.2 0.6 <br /> CSLr 7 6 3.7 <br /> 1.t <br /> C51-8 ° Zo 0.5 <br /> CSL_9 S t2 8 7.4 <br /> . y <br /> CSL-10 6 1.7 Q 6 i <br /> j3 I <br /> CONCLUSIONS <br /> Based on the field observations, the soil vapor survey, and <br /> laboratory analytical results, significant soil contamination does not anpear <br /> to have migrated laterally outside the tank excavation in the upper 6 feet eet of � <br /> the subsurface. Soil samples collected from the south end of the tank <br /> excavation, during the tank removal, contained ethylbenzene, .total xylenes, and <br /> TPH concentrations above regulatory applied action levels. The sample from the' <br /> t. _ <br /> u :north end of the excavation was below regulator actionlev <br /> y <br /> els. The tank <br /> ! appeared structurally sound upon its removal, thus the contamination in the <br /> southwest corner is likely due to overspill of product at the fill port or <br /> 1 leaking pipes from the tank to the product dispenser. f <br /> y <br /> 5 REGOMHENDATIONS <br /> G <br /> We recommend that because the extent of the contamination appears <br /> to be limited the remaining contaminated soil be removed from the excavation with <br /> a backhoe and be remediated with the existing contaminated soil stockpile by r <br /> „ surface aeration. As the soil is being removed, it should be monitored with a <br /> PLD and segregated into clean and contaminated_ stockpiles. Soils-exhibiting_TPH_—__ _ <br /> -concentrations;-of--more than- 25--ppm 'above background should be considered <br /> - - - <br /> contaminated, Sail contamination in excess of regulatory action levels in the #' <br /> excavation is likely limited in extent and should be able to be removed with a <br /> backhoe. After the contaminated soils have been removed from the excavation, <br /> y� <br /> �iligill,lig 11M MIMI FEW— <br />