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-6— Foothill Sanitary Landfill �Rodule LF -2 - Liner performance Demonstration , Joaquin County address the issue of a thicker layer for interim/intermediate cover during the inactive life of the Please um 12" cover considering that modules as part of the HELP simulation. Please justify long �h of time before this unit is closed. heaviest leachate flows are before the final cover, and lone 1 of liquids" per Title 27 and then Maybe a thicker interum cover could be used to "minimiz percolation removed when new waste will be placed on top. Section 4.4.1 Sensitivity Analysis -ati■ monstration report compares the modeled attenuated constituent oride and barium° Oto The performance de ding water Maximum Contaminant Levels for the inorganic constituents the results of the demonstrate that the liner design will prevent degradation rd ith background concentrations of the performance demonstration modeling need to be co— p of concern as established in the Water Quality Protection Standard as discussed above. , constituents analysis wasp performed on selected input parameters. The Report mentions that a limited sensitivity detail provided is the outcome of However, the details of this analysis are not presented: The only which it was reported that "all seven increasing the leakage rate from 0.2 gal/ac-day to 2.0 gal/ac-dayi in constituents remained well below MCLS-" The definition of degradation is any statistical or modeled cons ' 'cal increase above the WQPS (that is, two or more constituents detected above the Nfl?L or nonstatisti occurring organics, as per one or more constituent detected above the PQL in h cast for thus p�cular input parameter is the Standard Provisions). -The outcome of the sensitivity therefore evidence of a release. - on all input Parameters, Provide a*detailed explanation of the Please perform. a sensitivity analysis analysis and impact of the results. Appendix A — Table A-1 desi s. ' The alternative GCL liner was Table A-1 shows computed leakage rates for composite liner e �er was only computed with "poor "poor" and "good contact," but the prescriptive computed with p with P " ood contact" for comparison. contact." Please provide an analysis,of tile prescriptive i tive liner g Appendix D — VLEACH Modeling eters were based on? The foc percentage ' Table 2 - Please provide an explanation of what these param Valle based on samples taken at other appears to be high for soils on the eastern side of the Safi Joaquin Y 'de the rationale for using the organic carbon fraction of 0.05%. Wth recommend the sites. Please prove representative soil underlying County measure the true organic carbon content of the proposed depth of the base of the landfill)- closely preferred d to 1 The polygon are of 100 sq. feet should be reduceed°resent more on each of these parameters. { pathways. A sensitivity analysis should be perform '