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u -• _ <br /> 7.1 <br /> 16 March".1998�`: �? t <br /> a _ <br /> AGE.NC`Project No 95-0-1.1,4 ,' <br /> F Page 2 of 4 s , � <br /> ! T + l <br /> volatile halocarbons (chlorinated hydrocarbons)and the sam'ple from well M)X-3`was-analyzed for <br /> �,. mefhyl-iertiaryfbutyl ether,(MTBE), tertiary butyl alcohol (TBA');di-isopropyl ether_(DIPE),ethyl <br /> tertiary-butyl ether(ETBE)'and,tertiary any methyl-ether(TAME)in' accordance'with EPA methods . <br /> r <br /> - 5030/8015m„602 and.601/8010 and 8260ffi, respecti-My. ` <br /> 3.0. FINDINGS <br /> 3:I'. GROUND,WATER GRADIENT AND DIRECTION <br /> 'l. The average relative ground water elevation at the site decreased approximately 1 foot since tYie June <br /> 1997'sarripling event::Relati%ie.ground•water elevations'are summarized in Table. l'. During the,, <br /> December 1997 sampling;th&depth'to,°ground•Water at,the site ranged'from 27.91 to 28.4 feet below <br /> ' tops of.the well casings. <br /> The screened intervalsTor wells MW-1•and.M.W-2 lie betty en 34 and 54 feet bsg;and the screened <br /> intervals for wells MW-3R, MW-4 and MW-5 lie between-30-and 50'feet bsg,•thus,ground•'water <br /> is above the tops of the screened,interval in all five monitoringwells.-,` ' • ” <br /> The ground water gradient appears to be,steepest from MW-1 flowing eastward and less steep in the <br /> area between MW-5.and MW-4. The relative ground water,elevation is-depicted in Figure 3. ; <br /> 3.2:, PETROLEUM HYDROCARBON-IMPACTED GROUND WATER- <br /> During-the <br /> ATER Duringthe Decembersampling,'TPH-ss'was:detected in monitoring wells MW-2 arid,MW-3. <br /> at concentrations of 430 parts per..billion (ppb; reported as-micrograms per liter),and 1,700 ppb,, . <br /> ` res ectiVee . T-PH-ss'was"not detected•in the sam les collected from`MW-1 MW-4 or MW-5•durin <br /> p . . y p g <br /> this sampling event. 5. " <br /> .w _ BTE&X compounds were detected only iii the water:sample.collected from monitoring well MW-3,- <br /> Avhicnta <br /> hl'coined 0,98'ppb benzene, 0.98 ppb,toluene, 6.-2-ppb'ethylbenzene, and 1:1 ppb xylenes:° <br /> MTBE'TBA,.DIPE,-ETBE and TAME were�not detected.in'the ground water sample collected from, . { <br /> well MW=3;,arialyzed by;EPA-method 8260m: <br /> Analytical,results of ground water samples :are summarized i'n'-Table .l --,analytical•Results of ' ; -'-'• <br /> Stoddard ar�d BTE&.Y'Ar�cil}-ses. The laboratory report(MAI'Laboratory ID numbers 84719,through <br /> 1' 847263);.chain-df-custody.and QA/QC.report are included in Appendix;B <br /> Adrgnciel�Cco£mi'0nrn ;Inc. " <br />