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1 Lane. The tank had previously stored diesel ;used to fuel <br /> Vehicles., The tank removal. was observed: by Mr.. Harlin Knoll, an <br /> 3 inspector from the Health Department. According to Color S.pot,:s <br /> 4 consultants., Stall, Gardner & Dunn ("SG&D") , the tank appeared <br /> 5 intact: when. removed. However, Mr. Knoll requested that Color <br /> 6 Spot submit a remedial action plan for review and approval prior <br /> to: c+cnductng acldit3 on'al site work. <br /> 8 On August 18", 19:8:9', SG&D conducted a soil vapor survey and <br /> 9 sampled adjacent domestic water wells for icofita&i nants associated <br /> 10 with diesel. :Based ion the survey, SG&D concluded that soil <br /> i1 . contamination had not migrated laterally outside the tank <br /> 12 excavation, in the upper six feet of the subsurface. The data <br /> 13 from the- grr�undsi�ater in the wells indicated that there was no <br /> 14 hydrocarbon contamination present above regulatory action levels. <br /> 15 Cin January 9, 1990, SGD removed approximately 1:60 cubic <br /> 16 yards of contaminated sail from the excavation. Confirmatory <br /> 17 sail samples taken from the walls and base of the excavation <br /> 18 indicated that trace concentrations of toluene and xylene were <br /> 19 present at concentrations well below action levels. Following <br /> 20 the completion of the excavation, an additional five feet ;of <br /> 21 material was over excavated to :make sure that no contaminated <br /> 22 soil remained . <br /> 23 In a .lettar dated s'anuary 17, 19900the xealth. .Department <br /> 24 requested that Color Spat conduct a survey Of, groundwaiteri W. US <br /> 25 within .a 2,.0.00 :fo+ri`,t radius of site and that confirmation zamplos <br /> 25 <br /> bel collected from all groundwater wells within A50.0 foot. radius <br /> 27 of the site. Four wells were identified for sampling.. and all <br /> 28four contained trace ::amounts of benzene. Threecontained trace: <br /> -2- MVUCW0L0RSFAAMAL:ru3y <br />