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FROM RRMAGE Company PHONE NO 916 354 3250 Jun. 05 1998 03:36PM P3 ?Ar Harfin Knoll June 5,1998 Page 2 fa-lit iatiora The design of an in-situ soil bioremediation system typically includes previsions for the in*iron of air, water and nutrients into the plump for the purpose of enhancing the biological growth 01`natumIly occurring imicroorgaittsms. Tlw proximity oftlte plume beneM b the show which contfods the gmundwater surface, poses risks associated with the injection of water for biorernodiation. no lowing of hydrocarbons to gmundwder would likely occur and would necessitate a groundwater treatment system to contain and treat leached hydrocarbons. Groundwater treatment vmuld result in the withdrawal of di%%alvod hydrocarbons from beneath the site and would result in prohibitively expeutaive lreatmesd and disposal casts Ile rUn and prohibitive cost of m-situ bioromedialion.estimated at approximately$200,000,eliminates ibis cohort from further considcvation awLVm ar Eitraetii�ri Vapor oxtraotion pilot test data indicates that SVE has the potottial to raanove approximately 216 pounds of hydrocarbons per day. SVE has been proven to be an effective method to decontammato impacted soil,both from it technical god economic perspective. 'I'lie cost to design,install and oporate a 100(wbic foot per minnUe SPIE system for a period of one-year is approximately$104,000 As such,SVE is clearly the most economic and technically sound remedial opnon for hydrocarbon wurec romoval at the subject site. AIR SPARGING FOR GROUNDWATER TRRArMENT Due to the incresses in groundwater elevation beneath the site in the last 4 years,some of the wells originally instal led between 1990 and 1994,currently have well wA=nq that arc completely submerged below groundwater A review of the cons"tim log for existing well MWA indicates diet the upper well screen is approximately 27 feet below groundwater Moro irnportaitily,the welllbmvhole seal is also submerged approximately 23 foot bolow the groundwater surfisoc. 13aaod on the configuration of well MW-1 as compared to the curreatt groundwater depth,well MW-1 can be utilized as an air sparge well The advantages of adding;air spargmg via well MW-I are as follows The construction of new well is not neeessary r Well MW-I is located within the area of highest groundwater impact Air spargo off-gas from the saturated zLwe will be contained by the SVP system Air sparging will effect die removal of dissolved gasoline and BTEX while promoting saturated zone biodegradation via dissolved oxygen mems Themforo,Ramage hnviroinnontal proposes the inclusion of air sparging using existing well MW-1 as an s it injeeticm well The design effort for the SVE syatom will be expanded to iitelude• I)the addition of au air compressor to deliver prrssunzed air to the saturated zona,2)cu# rface piping from ilio himtww t compound to the MW.t wellhead and 3)pmooss witr9ol provisions to inanage the pressure and flowrate of sparge air. •