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<br /> 3.3. PETROLEUM'HYDROCARBON-1,MPACTED GROUND WATER '•z'
<br /> In July;. 1996,'TPH-g was detected in MW-14 at'a concentration of:3 ' )0 parts per
<br /> „•:,,, reported as mi lcrograms-per liter); BTE&X`AV detected iii MW-1-4,at concentrations of 33 ppb
<br /> benzene, 11.0 ppb toluene, 24:ppb ethylbenzene and 370 ppb xylenes.,Petroleuin hydrocarbons were
<br /> r no't;detected_iri the sample collected from EW-1 during the• u.ly, 1996 monifoHng event.,
<br /> During the September 1996„sampling; petroleum, hydrocarbons were'•d-ete6ted -in ground_water
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<br /> samples from fig%e of the ten wells'sampled. TPH�g concentrations ranged"froin below laboratory
<br /> method detection limits 'to .12,000 ,ppb- (MW-9), which also- contained 'detectable-.BTE&X _
<br /> concentrations of 120 ppb.benzene, 31 ppb'toluene, 690 ppb ethylbenzene.and`770:ppb xylenes.: r
<br /> Only xylene's Were detected iii the sample from EW-1 ata concentration of 0:72 ppb: TPH=g and
<br /> LBTE&X were not detected in samples;from MW-6,-MW-10;MW-11, MW-12 and MW-l3 during ., '
<br /> the September 1996 saixzpling: M
<br /> Between June and•September 1996, TPH-g;concentrations increased in two of the ten wells sampled ti
<br /> and remained MOW detection limits in five.of the sampled well's: Benzene.con&ntrations increased
<br /> .' in two wells �'decreased'in.orie-well and*remained undetected in-the remaining seven�wells: Charts
<br /> 8 = 13 (Appendix'D) illustrate benzene concentrations verses.time for monitoring wells MW-6,'MW-
<br /> 8,'MW-9, MW-1.0, MWA4 and EW-1.
<br /> EDB was not detected-in the sample from M v -14. -1,2-dichlor6ethane',was detected in samples from.
<br /> EW-1; lvIW=B, MW 9, MVJ-'13 and MW-14 at concentrations'of.i.9 ppb, 0.99,ppb; 22 ppb, 2.2'ppb
<br /> and.1.9 ppb;'respectively, a'concentiation increase in'two of seven wells con1pared.zto.the previous r
<br />' monitonng-results. 1,2-dichloropiropane was detected in MW-9 and MW-.14 at concentrations of 1.3
<br /> ppb and 2:2'ppb, respectively. 'Chloroeth'ane,,:tetrachloroethene and other„volatile'halocarbons,were
<br /> not detected"in any.6f the water samples analyzed. Analytical results of ground waterlsainples are
<br /> summarized on Tables 5,and 6 The laboratory report(MAl Laboratory I.D. Nos: 67022,'67023'and
<br /> '69206 thrdugh 69215) and chain-of-custody.forms are included in.Appendix`C:
<br /> 3A.'_ SOIL GAS S, 1M . .NG-
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<br /> Elevated concentrations :of carbon'dioxide. were'enc ou'ntered-,only .in wells..VW-7 and MW=8. . T
<br /> Organic vapor was'd'etected only in MW-8-All goiigas feld'dafa are summarized in'Table 3.'Charts
<br /> 7. 1 = 7;(Appendix D) show'concentrations of,CO2, 02 d'organic'vapor.versus time for wells VWA
<br /> VW-3 V W=4,:V W=S; MW-5,.MW-1.1 and MW' 14.
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