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<br /> 4' °04 May 2000 r
<br /> !I el^ir r 1, I,AGE NC
<br /> Project No.,:95,0114 �ti ► �y„ aL�u
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<br /> Page 6 of 8 i•`r i 1 Ir a 7 1 � I#r
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<br /> 1G1
<br /> Analytical results of ground water'samples are summarized in'Tables'2.'The laboratory report (Kiff t .
<br /> �-
<br /> Analytical report number 15916}, quality assurance and_quality,control(QAIQC)report and•chaiii of
<br /> Custody form for the January 2000 ground twater monitoring event are included'in'Appendix`E
<br /> s ;i
<br /> 3.3. CHLORINATED HYDROCARBON-IMPACTED GROUND WATER
<br /> '. During the January 2000-sampling event, chlorinated.hydrocarbons were reported-in samples.from
<br /> each well-at the site. The chlorinated compound reported with,the highest concentration>in samples',,
<br /> collected was cis 1,2-dichloroethene (cis-1,2=DCE).at 840 1 in well MW--6: Low-,concentrations'
<br />,1r
<br /> of cis. 1;2-DCE were also reported in samples.from wells MW-1; MW-3,'MW-4,MW-5 sand MW-T
<br /> Vinyl chloride was reported in samples from wells MW-3 and MW-6'-at concentrations of 130'gg/1 , y k
<br /> and 80 /.cg/l, respectively. I„
<br /> Tetrachloroethene(PCE).was reported in samples from each well,with the exception of well'MW-1,1
<br /> at concentrations as high as,440µgll. Chloroform was 'reported in sariiples from wells MW-1, N1W ,; u
<br /> 4; MW-5; MW-6 and MW-7 at concentrations ranging .from 0.74 µg/l and. 1.6 µg11, '1, 2-
<br /> dichlorobenzene was detected in samples from wells MW-2;MW-6, and MW77 at,concentrations ,
<br /> of 2.8 µg/l, 0.6 4g/l, and 1:0 µg11;respectively. '
<br /> Analytical results for chlorinated hydrocarbon compounds;in ground water samples,are summarized
<br /> in Table 3. The laboratory report for January(Kiff Analytical report number 159.1'6), QA/QC report
<br /> and chair'-of-custody form are included in Appendix E. '
<br /> 4.0. . SUMMARY '.
<br /> '. In summary, AGE found that:
<br /> • Between.September,l 999 and Jai-tuary2000, the relative-ground water elevation decreased..
<br /> an average of•0.42 feet at the site. F `'
<br /> •_ TPH-ss was-not,detected in the newly installed,.down gradient, ground water monitoring'
<br /> ' wells. BTEX compounds were detected only in the sample from Well!MW=1. ::
<br /> Concentrations of PCE reported in the water samples collected from wells.MW6 and^MW7 t I'
<br /> exceeded.the Maximum Contaminant Level (MCL),of 5"µgll established by the State of., ,
<br /> California - Department of Health Services.
<br /> Concentrations of cis`1,2-dichloroethene reported-in'MW&(840 4g11) and MW3 (120 ggll) - ,
<br /> exceeded the State MCL of 6p
<br /> "
<br /> I' .
<br /> Advanced GeoEnvironmental,lnc.
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