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f.I#111M11fAlt Y.J.tylill Q11E r,99WAll ;1Wgtl.!' M.1 14AM W Irrhn1ide n�",Mantrts,CPji1 1n4% V1114 tr ii�t Na-l4-�11 l74 l.��ilt�(iS.2�fCX leased nn information provided by the tuo rail borings rtrilled by ITIS (Section 2,1) suhturface mwterials it the site,consist printalily Pf liar,• tcs caatse-grained anti silty sand uitts rrrinar amltunis of Chy and silt, ["allowing completion of the activities dcictibed in this walk Man geologic crass» seclion(s)of Ilse site will be prepired anti presented in the Ptrlin[innr; 11;�trn�rnlnFir Atte+sr[Ar,l Flr�rr. ;,ase r!?1+,psf�llt:r17t� The direction of ground water flow within the uppermost water-bcar ing?one at the site hats not lien defined at this tine. Ilowever, because of the change in elevation from about )S feet nbavt ntcan sea level(ft msl)at the site 10 le,s than it)ft mil at Me San Joaquin River, located about five miles west or the site. it is Anticipaled I1131 the direction of ground water flow at Ilse site it in a Ueslerly to northwesterly direction, The direction of ground seater flow will be defined following the installation of the around watcr monitoring writ at the site(Section 4,1)rsnd will be reported in the Preliminary 11Ydtogeologir Alsrttntrnt Rcr-ort submilted at the conclusion of the investigation dcscrihcd in this work plan. ticcausc of the Possible presence of petroleum constituents on soils and ground water at the site,one additional sail boring will be drilled to characterize the sutsurface geology and to evaluate the presence of Petroleum constituer is in the soils at the site. The soil boring will be compItted within the tipper-most water-bearing zone as a&sound water monitoring well. This well,with the existing monitoring wells at the site, will serve to establish the natural flow gradient and hydraulic characterislics Of the watcr-raring materials, and the wells wail provide information for determinvion of whether dissolved hydrocarbons and/or free product are present in ground water at the site. 4.1 rInrinzLbjaa[j2jjgj_WjH Previous Notk at the site anti M-113's experience at similar loCitiors indicate that the ntea of Ilse site, most likely to have soils and ground water containing petroleum constiluenr: would 1'e adjacent or in Close Proximity to the underground storage tanks(DST's). For this reawn.one sail bating,which will to completed as a mrniloring well,will be located sdjacent to or in close proximity to Ilse tank cxcavation.(Figure 2), It is anticipated that this +yell (NIW-))will c!rve as a <lawn-gra<licnt well, _----with monitoring wells MW-1 and ! W_2 tiihtr urs-or across-gradient in relation to NiW-3. -- --