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TABLE S.l: SUMMARY OF IMPACTS AND MITIGATION MEASURES (Continued) <br /> Environmental Impact Mitigation Measure Level of Significance After Mitigation <br /> K. Hydrology,Geohydrology,and Water Quality <br /> (Cont.) <br /> (c) The project includes a leak detection system,a <br /> series of secondary collection trenches beneath <br /> the liner and directly under the leachate <br /> collection trenches. <br /> (d) Removal of any hazardous materials spotted <br /> during delivery thus minimizing the potential for <br /> leachate contamination if there is a break in the <br /> liner or the leachate collection system. <br /> K.6. Project activities that increase leachate (a) The extraction wells developed as part of the Less than Significant <br /> production from the existing landfill materials CAP should be maintained and monitored during <br /> during various phases could alternately Phases V and VI,to be employed as needed for <br /> facilitate the remediation of local groundwater, the extraction of any residual contamination by <br /> or result in groundwater contamination. leachate. <br /> (SIGNIFICANT) <br /> K.7. Surface and/or groundwater contamination (a) Maximum pre-loaded settlement of the existing Less than Significant <br /> could result if differential settlement damaged landfill would provide the maximum period for <br /> the liner.and/or leachate collection system of settlement,and would take advantage of <br /> the vertical expansion portion of the landfill anticipated improvements in geosynthetic <br /> (Phases V and VI). (SIGNIFICANT) technology that would occur over the next 35 <br /> years. <br /> (b) The final design for the vertical expansion may <br /> include additional components in the liner <br /> system,depending on future differential <br /> settlement on the liner system. <br /> S.26 <br />