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<br /> r' u � October' 1999 " ' r ,. ^ ' 4a `Ih, -�„ „ �{ II +' ,t ',
<br /> r AGE=NCr
<br /> Project No 95-0144
<br /> .'Page 3 of 4 ASI
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<br /> �N';Ground water elevations 2n s'lulW-19 n 1? x ,'
<br /> well , , MW=20 and MW-21,were between l 63 and 2 02 feet
<br /> 'lower>iri the lower screened intervals beneath°the confining clay layer than in the upper screened '
<br /> F}
<br /> interval Data frorri the upper screened rnterval,'�established in first-encountered ground,water was
<br /> 1
<br /> 11
<br /> used for'gradzent determination t _
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<br /> 3j - � ANALYTIC" t
<br /> �4
<br /> a r
<br /> s HL RESUL T'S OFWATER SAMPLES '
<br /> ' , I
<br /> �I Dunng 4 IS
<br /> the Augus# 1999 monitonng, TPH-g was detected in samples from momtornng,wellshMW-1
<br /> , � 1 1 ♦
<br /> Mme- , MW-I3, MW-2013, MW-21A and MW-2I B at concentrat�ans rang}ng from 52 parts per
<br /> I
<br /> billion(ppb,reported'`as m�crogr'ams`per,litef)to 2,900 ppb BTEX compounds,were detected p
<br /> well except MWI-21 at concentrations as high as 190 b in each
<br /> „A
<br /> to wells MW-4, MW-,13,-MW-21A and MW;2113 at concentratiorzs�rang�ng'fr mP°pp was
<br /> dQtected
<br /> Ppb TPH-mo was not detected during the'August Il 999 sampling event ,Detected eoncep` g�600 '� I
<br /> hydrocarbons in ground water remained relatively stable or decreased,slightl during the'last sons of i , I n
<br /> Y g Iasi quarter ,
<br /> r ' MTBE,was detected'm - �' `
<br /> 1 + n, .�'�.
<br /> f ground water samples from wells MW 12, MW-4 `MW_119B and MW-2l$ xtl l r?,;
<br /> MW-
<br /> at concentrations ranging from I 0 ppb'to 2 2 ppb Other oxygenates were not detected at the site W, '
<br /> dunng the°August 1999 monrtonng event Htstoncally,„onlyrlow concentrations of MTBE and TB
<br /> ”a "I
<br /> have been detected intermittently,at the site Analytical result`s for August 1999 are sum A
<br /> Table 2 'Analytical results of b2stoncal ground water samples are summarized on Ta 'malfzed on
<br /> {r'The'laboratory report (MAI Laboratory,I D Nos 170b 1-17070) and chain-of-custod les,3 band{4 rt
<br /> :-included w - =
<br /> ` �n Appendix B r r y forms are`, '
<br /> ,
<br /> 40
<br /> ^° 14 I .,. ,. r J ' p �, •,{�'• ,•° Fns + n�{ ,t. r ti I t
<br /> S UNTMARY/CO {
<br /> NCLUSIONS
<br /> lie
<br /> ' �} • '
<br /> is g I Yr
<br /> Based upon data collected
<br /> the A
<br /> i T , 'Co cted from site, GE concludes �' ti `r I '
<br /> ,Ground w "
<br /> + iter elevation decreased�slightly at the,site' during the previous quarter Ground
<br /> water remained above the screened interval In four of the shallow wells sam 1 I r
<br /> current quarter Ground water elevations-in',wells completed beneath the Pay layer were {
<br /> lower than rn wells completed wlthin`first ground water '
<br /> y
<br /> ' Pgust
<br /> etroleum hydrocarbonsawere detected in nine of the ten'wells sampled durin t
<br /> ti 1999 mon�torrng'event Concentrationsrof hydrocarbons have generally remained stable 1:
<br /> decreased sl2 ,at the
<br /> gtatly site between' ," '
<br /> May and August 1999, t, ' '�
<br /> f MTBE was detected in four of the'ten wells sampled at concentrations as high as 2 2 ppb
<br /> Other``
<br /> oxygenates were °not detected in the,samples'collected durmgi,,the°Adjust 1999 '
<br /> 4'+
<br /> y f ,monitoring event �, h
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