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<br /> 25April2000 .
<br /> i AGE-NC-Pr0'ect'No. 95-01`09
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<br /> 3:2. MICROBIOLOGICAL'ACTIVITY IN"GROUND WATER
<br /> Gene''ral and selective microbiological subpopulatiorisdecreased in MW-9and increased inMW-14: r:
<br /> concentrati: � . . .
<br /> ` • " ' generally ons:remaln`beloW'aptlrnal
<br />' Nutrient concentrations 'remained`stable.•Nutrient` .
<br /> for:ongoing bioremediation. Field' measurement for indicators, of microbiological-activity. are
<br /> summarized on Table'2;rrlicxobiological and physicochemical analyiieal results"are summarized on ,r
<br /> Table=3': The laboratory report (A. Keith Kaufman April 13, 2001) and chain-ofcustody form are
<br /> .included iri Appendix B:
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<br /> 3 3 PI'ETROLEUM•HYDROCARBON-IMPACTED GROUND WATER 4,
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<br /> 'Petroleumhydrocarbons were detected- in ground water samples 'from;six of the -fifteen wells
<br /> sampled: -TPH-g ,concentrations ranged.as ;liigh'.'as '6,100,';parts per billion.(ppb; 'reported as ^
<br /> t ':'micrograms per liter). Benzene;toluene; ethylbenzene,and xylenes were detected at concentrations `
<br />' a&.high as 230 ppb;.150•ppb,A80'ppb•and'820 ppb, respectively. The highest concentrations'were
<br /> detected in samples'collected`.from MW 8, MW-9'and MW-14':Petroleum hydrocarbons'were not
<br /> detected in the samples collected from'MW-2, MW-3, MW-55 MW76; MW-7,'MW-10, MW-11,.,
<br /> MW.12;and MW-13. The results of analysis by EPA Method.8015n-/602 for the Match 2001
<br /> monitoring event are presented on Table 4,Historical analytical results by EPA Method 8015m/602
<br /> are summarized•in'!Table 5..Graphs illustrating the concentrations of benzene and TPH-g over time
<br />' are presented in Appendix C.
<br /> TBA I Was detected in the",s`dmp le,collected from MW=9 at a:concentration' of 45-.ppb. Other
<br /> oxygenated compoun s were not detecfed in-the samples collected: 1;2'Dichl6r6ethane(1;2-DCA),
<br /> was detected in es collected 'frolri 1VIW-1, MW-3, MW-4, MW-5, MW-7, MW-8, 'MW,
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<br /> MW-12, MW ;14.and EW 1 at-concentrations as great as 59 ppb.'Six additional analytes,"d'etected`
<br /> ' ;by EPA Method 8260,are noted in Table 6:The laboratoryreport NAI Laboratory I D Nos.62944 '
<br /> through'62958)"and°chain=of-custody,form are included in Append x'B'. r' .
<br /> ' .4 0 �'DISCUSSION" D CONCLUSIONS'> y
<br /> y 'Based» ' • 1 ' � �• rn- e1 ite Ili.• €�„ • F '. �; -: E .a r: ..
<br /> upon data co lecied'rfro th s ,;AGE" rids
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<br /> N's Ground water elevation Increased at the site 0 58.feet during the first quarter of 2001.Ground.
<br /> ' .water flow direction continues1o'be,tbward the south=southwest at the site
<br /> ' Hydrocarbon,concentrations in,ground'wate' increased Slightly in sam' les
<br /> 'c011ected from
<br /> 'we11s�IVIW8,MW9 and MW-14 and generally'decreased,�where'detected, in't_he remaining,'c '
<br /> ,. wells cornpared.to results of the:December,2000 sampling
<br /> Advanced Geo'Environmental,Inc: ;
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