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:r <br /> C <br /> ii RECOMMENDATIONS - <br /> From LH'S prel tminary investigation, It appears that petroleum esite. <br /> hydrocarbon. Furter <br /> i Dost;tuents exist 1n tho soil in the northwest corner of the site. Further <br /> Investl gatlon of this area is warranted. Therefore, LH recommends that two or <br /> I three 5011 earings be installed in the northwest corner of the site to determine <br /> the extent of the contaminated soil for future remedlaticn. <br /> I Groundwater ap�ppears to flow in an easterly direction at a gradient of , <br /> .-{ 0.003 ft/ft. Honi toring wells located owngradient at the site. H02 and MH5, <br /> ,. i. contain high levels of dissolved petroleum hydrocarbons. This suggests that <br /> contamSnated g,oundwator may be moving offsite. Mans taring wells M41,MH3, and - <br /> FlW4 also show deLostahis concentrations of BTAE, suggesting possible off-site -- <br /> sources. Information regarding the upgradient Texaco service station located - <br /> ✓ approximately 7S feet to the west of the proJact site should he collected and <br /> oval uated as a potential source. -- <br /> �� In order to address the offsite, downgradient lateral extent of the suspected <br /> contaminant plume, LII recommends Installation of an off-site monitoring well <br /> r-� east of the site. <br /> l'• <br /> An aquifer test from ane of the existing 4-Inch nit-ring wells $s also <br /> recommended to determine aquifer characteristics for future remediation. <br /> �� Ti <br /> As for the current status of the site, LH recaamends that 0. oil stockpile <br /> and non-hazardous soil contained in drums be used as backfill material In the <br /> currently open excavation. The excavation hould be backfilled to grade, .., <br /> " ehjsacted, and repay-d to minimize the physical safety hazards associated with <br /> oPon excavation. <br /> 9832.12.rpt/dkj - - <br /> i <br /> i " <br /> Z, <br />