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WILSON,SU1VSIATt,GOODRICEI&RosAri <br /> Ms. Linda Turkatte, REH '. <br /> May 26, 1993 <br /> . . P,age:Z .• . <br /> In August 18, 1989, SG&D conducted a soil vapor survey and groundwater sampl tg <br /> t6 determine the lateral extent of the:contamination and to evaluate the:adjacent domestic: <br /> groundwater wells for contaminants associated with diesel. Based on the survey, SG&l <br /> cbri+cluded that the soil contamination did not appear to have migrated laterally outside the a <br /> tank excavation in the upper six feet of the subsurface. Because of this, SG&D , <br /> recommended that the remaining contaminated soil be excavated and properly disposed. of <br /> The,data from the groundwater in the wells indicated that there was no hydrocarbon <br /> cittamination_present above regulatory action levels. <br /> 0>2 January 9, 1990,, SG&D removed approximately 160 cubic yards of contaminated <br /> s>il froth the excavation. Confirmatory soil samples taken from the walls and base of the <br /> excavation.revealed A race concentrations of toluene and xylene were present at concentxat ong. <br /> v�ell below action levels.,. Following the completion of the'excavation, an additional. five feet: <br /> of material was over excavated to make:sure that no contaminated soil remained. <br /> Because benzene.wais found`in the groundwater samples but.not in the confirmatory <br /> soil samples from the excavaition, SG&I concluded that the underground storage tank:was,, <br /> not the rause of the benzene contamination in the groundwater. <br /> n a letter dated January17 <br /> , 19901, the Health Department requested that Color Spot <br /> ca►nduct a survey of groundvyater:wells within a 2,000 font radius of site and that <br /> 06nfirrnatiorl sainples tie collected from 411' <br /> ll groundwater wells within.a 500 foot radius of the <br />(. site: Four wells were identified for sampling, ;and all four contained trace amounts of <br /> y <br /> benzene. Three`containdd..trace amounts of toluene. Both constituents were:gresent.in <br /> concentrations well below the drinking water standard. <br /> • •L3uring the week of October 8, 1990, SG&D conducted a supplemental site assessment 14 <br /> 6 <br /> ai the site.. This iricluded,the advancement of four drill holes to depths;ranging'from 30-90. <br /> feet'bel+ w the.ground. sutface. 4S-G advanced the borings to 81�and>:90 feet wi put t <br /> finding grouW*At&. Finally, SG&D was able to collect a grouwater sarnpie firom one of <br /> rte drill holes at a depth of approitimately 92 feet. Because the drill rig had reached its <br /> mechanical limit, the groundwater;sample was collected from inside the'hollow stem auger:, <br /> It was not possible to construct a proper groundwater monitoring well ;at the.site. Neither the <br /> soil cuttings from the our bore holes not the groundwater sample contained detectible <br /> + nc ntrahorss;of hydroca .n_contamination. <br /> i <br /> We understand that the Health'Department's current position as set forth in a letter'to <br /> Color Spot dated April 2, 1993 is that Color:Spot must submit a work plan providing,for (1} <br /> the invesdodon•rn the vertical extent of the contamination in title tank excavation and Q) the <br /> iristallat on of three monitoring wells at the site. In addition, the Heailth,bepartment has, ' <br /> a. .* <br /> :1EiClMEt1t11LC.1COIOFlSP111[7RKQ511:L1A(SP2}: <br /> • _ r <br />