Laserfiche WebLink
would occur within the vadose zone, VOC leakage at Forward Landfill would be non- <br />detectable. <br />Leachate Constituent <br />Average <br />Leachate <br />Concentration <br />(4g/1) <br />Calculated Degraded <br />Concentration in <br />Groundwater <br />(µg/1) <br />1,1,1 -Trichloroethane <br />2.45 <br />0.001 <br />1,1,2-TrichIoro- 1,2,2-trifluoro ethane <br />0.43 <br />0.000 <br />1,1-Dichloroethane <br />4.21 <br />0.001 <br />1,1-Dichloroethylene <br />0.54 <br />0.000 <br />1,2-Dichloroethane <br />0.96 <br />0.000 <br />1,2-Dichloropropane <br />0.48 <br />0.000 <br />Acetone <br />101.53 <br />0.030 <br />Benzene <br />2.27 <br />0.001 <br />Carbon disulfide <br />7.05 <br />0.002 <br />Chloroethane <br />2.99 <br />0.001 <br />cis-1,2-Dichloroethylene <br />1.70 <br />0.001 <br />Dichlorodifluoromethane <br />7.34 <br />0.002 <br />Ethylbenzene <br />2.32 <br />0.001 <br />Methyl ethyl ketone <br />163.40 <br />0.049 <br />Methylene chloride <br />5.17 <br />0.002 <br />Tetrachloroethylene <br />1.05 <br />0.000 <br />Toluene <br />3.61 <br />0.001 <br />trans-1,2-Dichloroethylene <br />0.43 <br />0.000 <br />Trichloroethylene <br />0.82 <br />0 11 .0 11 00 <br />Trichlorofluoromethane <br />1.59 <br />0.000 <br />Vinyl chloride <br />1.09 <br />0.000 <br />Xylenes (Total) <br />4.31 <br />0.001 <br />As described above in Section 3.1.1, owing to the size of HDPE defects and the low <br />hydraulic conductivity properties of the clay liner, leachate leakage through the liner <br />section is expected to occur as unsaturated flow. Considering the clayey character of <br />near -surface soils in the area, leachate migration through the vadose zone beneath the <br />liner would also occur as unsaturated flow. While some leachate constituents may <br />eventually arrive at the groundwater table, the adsorptive capacity of the unsaturated soils <br />within the vadose zone would further retard the rate at which these constituents mix with <br />groundwater. <br />C:\2002-002\Revised Appx A - Leakageldae\09/19/02 <br />Geologic Associates <br />