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- -.w� e. .'. ':�:b_. .A +r.:,`c x T" :a.� .. .- X54 m"�.,�„�;y _`rr,' �,s n?t mac•. '`�i'.Kx '�.�°Pa � -_:�-�'. :?a '3 fir- ,°'-� �- —�3 ,�, .�a,- •m�` �`"� - .� In addition to the field investigation,EA recommends collection of any information on athcr potential srwmts of petrrleum and previous haul use in the vicinity of the sits, Two of(site wells(Figure 2)arc also proposed to define the downgmdlcnt extent of the plume sheet may Bare nwved along a buried streartt channel indicated by earlier investig>Ilons, Placc. trtcnt of downgradicnt yells was based on output of the computer model BIOPLUME 11 (Rice Unlvcrsity 1987)wing data from the 15 Novemb” 1988 and 14 Aprd 1989 well gauging and umpling tcwnds(1-igurc 2). 4. STATV8 OF SOIL,AND GROUNDIVATI R REMEDIATION lletween 23 and 25 January 1989,rive vapor extraction wells were installed in and around the fomter undcrVound storage tank arca,to be used for mrrcdiadon ofpetrolcum hydrocarbons in soils. Shills were sampled during drilling and analyzed for petroleum hydrocubons. t onecrttra- tWit up to 16,O00 ppm TPH were found at 24.5 feet in wells V3 and V5. T1'll levels fou.-A at 31 X feet In MW4 were 3.300 ppm(see Table 3). On 24 April 1989,four of the five vapor cunction wells wcre tested to dctemrine design param- vers for a vapor extraction and treatment system at the site. The coaccntrations measured in vapor Rant*yells V2.V4.and V5 averaged 4,5CO3$0.000.and 16,000 ppm.respectively. Can the slate day,the vapor tmnsmissivhy of the soil was tested. The sail vapor h)*ocarbon concentrations and the soil vapor trartsmissivity nr mpirements indi- cate that the soils beneath former SS 9-1918 arc well suited to pet;olcum vapor extraction. Vspor extraction and treatment wilt be Initiated upon completion and installation of the system an site(29 Octol 1990). Grouadwster%;-tele MW3.MW4.MWS,and MW6,which are now dry will be plumbed to the system so that hydrocarbom stem ied in clays and ssr.ds by the de- cline of grvindw�tcr can be mmiedsated i'Figurr 3). Bocausc all wells on the:site are dry.EA has developed a work plan for further investigation prior to considering remedist;on of pp7outrdwatex. S. REFERENCES CA (EA f ngincering,Science, and Technology). 1990. Proposed Work Plan to Assess Gro�rndu�atcx Corrtaminadon,l"�nrr:�r t;.'heti�xrn SS 9.1918.Stocktbrs,t^..i, 4�larctt. t4*1 avgt 2