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Y }.1 s `. _ ` "r !J r ti f j,4 ( Y, r y, , u ij t rc• y <br /> i f ^ r f ti'• i• ^i r, <br /> 1, ..cy <br /> Septen. 1996 r <br /> t AGE NC Project No 95 .0114 <br /> a c` <br /> Z 4 t 1 • ! r f s [ r JI r[ 4 r j ,,r r N4 <br /> Page 2 of 3 <br /> and BTE&X'in'raccoruance with'EPA metho`ds.GCFID/5030'and 602',-re'spectively <br /> y 1'. "'fin 'r' :4 I'• -1 F' t v» y . <br /> FINDINGS r G <br /> 3 1 , `GROUND WATER',GRADIEN,T AND DIRECTION f. <br /> Diiring the June 1996 sarripling,the,depth to ground water at.the site ranged from 30'80-to 32A feet: <br /> r . , below'tops�of the*ell,casings: The:average',relative groundwater elevation-at the site increased <br /> -.approximately 1.52 fed since'the March- 1996 sampling event.Relative`ground'water elevation s`•are .• ,:` - <br />`', summarized in Table <br /> 4 Between March and June 1996,groundwater flow'direction rotated frorn southwest to tlie'northeasi ; <br /> ' :The calculated gradient for June 1996 is consistent with the dominant historical'gradient at the srte ' <br /> ;. <br /> Ground water flow.direction isndepicted in'Figure=3 -Relative Ground.Water.Elevatirrn' - <br /> -3.2. PETROLEUM HYDROCARBON-IMPACTED GROUT}D WATER':- <br /> z. <br /> "''During the June 1996 sarripling, TPH=ss was de#ected in MW-'2.and MW-3 at concentrations of 250 <br /> and 2,300-F:cg/l'(niicrograms per liter,equivalent to parts,per billion: ppb),respectively.'Neither TPH� <br /> ' :ss,nor BTE&X,"were-detected•-in ariy ,s rriples collected during the June 1996-sarnpling,event. ' <br /> .' Anal -tical results°of round wafer sam les are summarized in Table 2:.The laboratory re oft' <br /> y g P rY p { , <br /> Batch Number 96-0626=01'4) and-chain-of-custody.are included in`Appendix C, K <br /> 4.0.' CONCLUSIONS AND RECOMMENDATIONS- <br /> _CONCLUSIONS' <br /> ''• : Based:upon Curren#`analytical results of.ground water'samples`;tlie,dissolved hydrocaibori plume <br /> appears to be stable;however,the•southern u = adient) extent of the dissolved liune•has riot been` <br /> { 1? g ) p <br /> ;delineated;.An additional ground.water'monitoring welt may need to be'installed'`south'of the former, <br /> UST'excavatiori.'Monitoring well construction details`for existing wells are included in Table 3,"' <br /> -Monitoring,Well Constru'chon, <br /> 4.2: RECOMMENDATIONS + s <br /> A well: urve' •should be erformed to'determine'the number and locatioris,of,any possible ground <br /> 16,� , Y p <br /> water.receptors-near the site. Results of the.v�ell survey should be used to deteriniire:if groundwater <br />