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I <br /> TABLE 3 <br />' ANALYTICAL RESULTS OF WATER SAMPLES <br /> HVOC's and Lead <br /> Geweke Land Development & Marketing <br />' (AgIL) <br /> Compound/ EW- MW- MW- MW- MW- MW- MW- MW- MW- MW- <br /> Sample Date 1 6 7 8 9 10 11 12 13 14 <br /> 1,2-Dichloroethane <br /> 9-27-93 25 ND ND NA NA ND ND ND 12' 93 12-27-93 33 ND ND NA NA ND ND ND 14 43 <br /> 3-28-94 22 ND ND 5 1 70 ND ND ND 33 70 <br /> 6-21-94 58 ND ND NA NA ND ND ND 56 1 85 <br />' Lead' <br /> 9-27-93 ND ND ND NA NA ND ND ND ND ND <br /> 12-27-93 0 012 0 012 0 013 NA NA 0 008 0 011 0 011 0 013 0 012 <br />' 3-28-94 ND ND ND ND ND ND ND 0 021 0 008 0 023 <br /> 6-21-94 ND ND ND NA NA ND ND ND ND ND <br />' EDB <br /> 9-27-93 ND ND ND ND ND ND ND ND ND 2 7 <br /> 12-27-93 ND ND ND ND ND ND ND ND ND 11 <br /> 3-28-94 ND ND ND ND ND ND ND ND ND ND <br />' 6-21-94 ND ND ND I NA NA I N2__L ND ND I ND 055 <br /> gglL =parts per billion(ppb) ND =Not Detected <br /> "Results in mgfl(parts per million ppm) NA = Not Analyzed <br /> 1 <br /> petroleum hydrocarbon plume has not migrated beyond the down-gradient wells (MW-12 <br /> and MW-13) Overall, hydrocarbon concentrations at the site are decreasing, the overall size <br />' of the plume also appears to be decreasing <br /> Only very low concentrations of volatile aromatics (BTE&X) were detected at the site The <br /> 1 State of California Maximum Contaminant Level (MCL) for benzene is 10 ppb, toluene is <br /> unregulated, but has an Action Level (AL) of 100 ppb, ethylbenzene has an MCL of 680 <br />' ppb, and the MCL for xylene is 1,750 ppb <br /> Concentrations of toluene, ethylbenzene and xylenes did not exceed the MCL in any wells <br /> t sampled Benzene was detected only in samples from MW-14 and EW-1 at 2 4 ppb and 0 95 <br /> ppb However, only concentrations in MW-14 exceed the MCL <br />' A combination of intrinsic and engineered bioremediation is a possible explanation for the <br /> decreasing hydrocarbon concentrations at the site Soil conditions at the site have already <br /> shown reductions of hydrocarbons within the vadose zone, the groundwater samples from <br />' the June 1994 monitoring may be an indication that bacteria at the site are now degrading <br /> hydrocarbons in the groundwater at an accelerated rate Physical sampling of contaminant <br /> 14 <br />' k 33/&KOCDM QM/ <br />