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f,�? ., _ • - .. ."}E. � `r �#,,._:�..yam.� _ , �:. Asa.N �� '-4-� �� ti-:�- '_�µ `� _ -k <br /> rs <br /> P� <br /> 9teektaa Plating Inc. <br /> - October 20? 1991 - <br /> Page -21- <br /> former tank site. One of the drawbacks of this option are that <br /> s • <br /> the Limits of gasoline contamination need to be further <br /> w• <br /> investigated, most likely with additional soil boxings, which may <br /> be very difficult due to thr: limited space. .Also the soil types <br /> at the site which consist of clay, silt and fine sand, generally <br /> are too fine grained and dense for optimum vapor extraction in <br /> I <br /> large zones. The advantage of this option is that as the <br /> i..a volatiles are removed from the soils, the potential for further <br /> to <br /> contamination of soils and groundwater is reduced. <br /> j <br /> Option 3 <br /> Re-excavate the site to remove as much of the remaining <br /> gasoline contaminated soil as possible. The clean soil would be <br /> segregated and left an site while the contaminated soil would be <br /> loaded onto trucks and delivered to another SPI property for <br /> i , remediation or temporary storage. The disadvantage of this <br /> option is that it may not be possible to remove all of the <br /> contaminatca, soil without jeopardizing the structural .integrity <br /> of the building near SS3. Therefore, depending on the quantity <br /> F,4 <br /> and concentration of remaining contamination, add..tional <br /> remediation may be necessary (ie., vapor. extraction) . The <br /> advantage of this option is that much of the gasoline <br /> contaminated soil located beneath and adjacent to tank site TKI- <br /> �e 90 could be removed. The actual fieldwork would probably___require_.._____ <br /> only a few days. Re-excavation may be the most economical <br /> U' <br /> remedial option. <br /> 1 � CONDOR ; <br /> Is <br />