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<br /> ti r `r�,f =n',24 December 190
<br /> "AGE'NG Project No. 95-0106.
<br /> Page 2-U4,':
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<br /> ' chainl'of custody to McCampbell Analytical;Inc. (MAI), dCalifornia Department of Health Services
<br /> i (DHS) certified analytical laboratory for analysis:.The,samples were analyzed,for:
<br /> p �� y' h EPA
<br /> • xTotal et ii hy drocarbon"s q.u.antified as�gasolip. {TPH g in accordarice wit
<br /> 'Method.80i S-Modified, _ ' ' t v` I"
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<br /> ' Volatile aromatic compounds, s 'ecifically-benzene,+toluene, ethylberizene, and total xylenes
<br />' fila (BTEX),with methyl tertiarybutyl ether(MTBE)in!accordance with�,EPA Method 8020;andTo
<br /> • + Oxygenated fuel'additives 'IViTBE,tertiary:butyl alcohol {TBA), di-isopropyl ether(DIFF);I
<br /> a . , ethyl-tertiary butyl.,ether(ETBE),andltertiary,amyl txiethyl'ether'(TAME) in accordance with V W"�
<br /> EPA Method 8260 Modified.
<br /> 3 0., '{' FINDINGS
<br /> Groundwater elevation-and'flow'direction were calculated from field d"ata;:hydrocarbon iinpact,to "
<br /> `ground water was inferred,'froni laboratory,,analysi's bf�the•groundwater.samples ;"{
<br /> J 1 _ 1 ,i �r I ,'t II •J i 3 ,1 s GROUND WATER ELEVATION AND'FLOW DIRECTION �r
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<br /> The average relative ground water:elevation not counting M'W6,,dh.creased'an average of 0.6.8 feet
<br /> since the° i moniioring`event and"the average flaw,direction was radially;northward. The average
<br /> :ground watertflor direction to the<area.enclmd-by inonit6hrig;Wcl1s MW3,'.MW4,.and,,1VIW6 was
<br /> 'toward the+norih northeast at a gradient!of approximately 0:00$'.ftlft,-and',the flow direction was 1
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<br /> toward- 'the north'-northWi6k sin the,area bounded by;;MW 1; 'MW5, and MW,4 atxa gradient (if
<br /> approximately 0.004 ftlft(Groundwater eleyation,data is pre.
<br /> sent{ed in Table4' the contoured;ground
<br /> y - water:elevation'data;is shown ow igure 3:Groiuld:water elevation.in 1VIW41was;unusuallyhigh for r
<br /> r reasons not currently understood=`Omis'sion of the'data from contour>map (Figure 3)'allows
<br /> construction of the flow direction arid�gradienti ni, manner,consistent with previous'groixrid"water
<br /> monitonxig events i xHhl�t " ',+` i { a"il��a i `�• ■ Irm {
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<br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES• : ! • jr, t ;1�zi �F I I s { Ir;.
<br /> ''�; 1 +:Iv "..I .+ i �! rye I [ +.} a'. �, .o! I U .-•^' 1,{r ,w'. .. I s r °7 ., 'GI+}�I`I�
<br /> �'� d�,^ I,l,•1. ti{IC � + � .r +.r'1�_{ „�. •' I r „ „ iV rl I:• �,., ,. t:•- -.: "1 - z"- I �.- �lr l� Pt.•� 11 iI.I,JIi,,,}I'�
<br /> Petroleum hydrocarbons were`detected 1n,the;ground water 'samples collected from monitoring,wells JJ „i r If,. J 1;
<br /> BMW '1 "and MW.-4 MW 1F is located]!slightly,cross'and gr the.`forrrier
<br /> down- adient from
<br /> ,excavation and lyIW-4 is located fiirther north in'the enerall down= adient direction ,TPH g w"as
<br /> detecte%d at"concentrations of-4,200 micrograms per liter,{ g7l) and '1,100 ug/l, respectively
<br /> samples firomltlie.tw0 wells Benzene Was;'detected at;300 µg11 and.43Iµg11 m samples from MW-±1 ;
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