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<br /> December 1:999',
<br /> AGE-NC Project'No:,95-0106
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<br /> andMW=4,respectively:;Other'volatile aromatic`cori3p'ounds;were detected at,'concentrations'of•79 i
<br /> a ; µg/l'arid $.5,µg/1 toluene,'and•35,µg11 and 7Tµg/l.ethylberizene and 71 Eig/l.and 79 µg/1 xylenes in ;
<br /> ' samples from MW 1 and MW 4; respectively Other analytes were riot,detected in the'two samples
<br />``a.': ,,,s#- ,h�,..7. nr, y: J p = 'i,� �,-cis ' - _ 's _ h. _•._ i I Mt,4'•� I-_�.f`,
<br /> I. r ,:},. .. ,. ''' he 1.`, a ;:. '. ' J � ,• � , i I '” Y � ,.
<br /> .`"Neither TPH-g.nor BTEX'comp''un ds were''detected in the ground water samples from monitoring ,'0i"a`
<br /> wells'MW=2,IVIW-3,MW-5,1V1W-b(upper.)o,MW-6(lower)and MW;7:•Oxygenated fuel additives r `
<br /> I ' } were notdetected in'a'n' of the,ground water'samples.Analytical results of ground water=samples
<br /> 4 i
<br /> for:the August''1999 monitoring event.are surrimarized on•Tables 2 and 3'::The.laboratory report
<br />' (MAI I aboratory ID 26721 through 26728),0 QC and chain-of-custody are included'm Appendix 'Jh
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<br /> F r I1;5 i � NYti '� ,rl�L� •' ,c =_ - i_. .. _ ,•- -..Kn .if; t - a! ;' , �£,. ' S e a a: �i J.Via--.
<br />'I 4 0 SUMMARY/CONCLUSIONSJ .j.
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<br /> The•following conclusions were drawn from the results of the safe,investigation
<br /> •._
<br /> The J adient on 24,Nowember 1999 was ealciilated to ran e,froin 0.008rtoward r'
<br /> ground 'water g :
<br /> J the north-northwest to 0.004-toward the north-northeast. '
<br /> Ground water elevation at`the site increased`an aver 0 68 feet since the lastquarterly
<br /> • a
<br /> y monitoring event ,
<br /> oY Dissolved petroleum h droc'arbons were;`detected in;ground water samples from monitoring
<br /> wells MW-
<br /> Land MW..=4;tloeated'cross-to down-gradient on-site acid down.gradierit off=site; ;r
<br /> respectively a from the former US I I
<br /> T qtr. ,T
<br /> *excavation t '• ,' "
<br /> 1 , t
<br /> ,
<br /> + •';'� OxygenatedY compounds were not detected in any of the ground water samples b'y EPA r ,4
<br /> r _
<br /> h. Method'8260 Modified J
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<br /> sir �, 'I=-� - iY". ...• .,., ,'' Y:•.
<br /> aBTEX
<br /> co ounds were detected in the water sam les collected froni IVIW 1 and MW,4,the
<br /> p p.,; '
<br /> y, ' '; � concentrations'of lienzene exceeded the_State".of California maximum contaminant level
<br /> IVIG - ' 4i •i` 1 j,
<br /> �w '.1,'( L) of 1'µg/, for.anAking:water , ' , r •I I r.
<br /> As;cari;,be rseen'on Table 2, the'concentrations of analytes detected,in the-'g' ro'u'nd'' ater
<br /> "''-the
<br /> r i ,I'• 4.-
<br /> samples in impacted-on-site monitonng well(MW-1,)have generally-declined over the
<br /> 'course-of the six previous sampling/moriitonhg event's,`but-have rebounded during the,four
<br /> ,, . quarters of 1999 a „,
<br /> F��if rzr.Il h1 r ,ii• :.:Y - - ' _ ', 1 .. ,Y -�', F, l tqM `Ir,l „rYS=I,I f f I. °
<br /> F ,Y 7
<br /> � ` •• . ` Analytical data from'rrionitoring,well MW-'2 limits,the extent'of dissolved:hydrocarbons
<br /> ;'southward of'thd site. Analytical:data;frorr well MW 3, and-MW;6 limits the extent'of 9
<br /> - ,
<br /> dissolved.hydrocarlions�northeastward of the site Analytical'data from rrionitoring well MW
<br /> 5 limits the extent:of dissolved hydro carbons'westward of,the site; Analytical.data from well
<br /> ;' '� - ''MWf-7 limrt_s"the'ex'tent of dissolved Hydrocarbons east o'f the site Y,1 3+, " i • ,
<br /> ' n t J " t n ` ° �� " G Environmental'inc.
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<br /> A Panned CO ,
<br /> 1 m�qf lir �� t 'J i' s '' ' ` •I , ; I , ,
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