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Page 29 'ENVIRONMENTAL IMPACT MITIGATION MEASURE LEVEL OF SIGNIFICANCE AFTER MITIGATION (b) The liner and leachate collection systems for the expansion have been designed to meet or exceed the regulatory requirements. a (c) The project includes a leak detection system,a series of secondary collection trenches beneath the liner and directly under the leachate collection trenches. (d)The operator would remove hazardous materials spotted during delivery,thus minimizing the potential for leachate F contamination if there is a break in the ! liner or the leachate collection trenches. (e)The landfill operator would include practices and procedures in the Solid ' Waste Facilities Permit to comply with AB 1760. The procedures would describe how the expanded landfill would salvage all F l economically feasible metallic discards. l K.6. Project activities that increase (a) The extraction wells developed as part LS leachate production from the existing of the CAP shall be maintained and F landfill materials during various phases - monitortd during Phases V and VI,to be could alternatively facilitate the employed as needed for the extraction of remediation of local groundwater,or result any residual contamination by leachate. f in groundwater contamination. (SIGNIFICANT) K.7. Surface and/or groundwater (a)Maximum preloaded settlement of the LS contamination could result if differential existing landfill would provide the settlement damaged the liner and/or maximum period for settlement, and would leachate collection system of the vertical take advantage of anticipated expansion portion of the landfill(Phases V improvements in geosynthetic technology and VI).(SIGNIFICANT) _ that would occur over the next 35 years. r i (b)The final design for the vertical expansion would,if necessary, include additional components in the liner system, depending on future differential settlement on the liner system. i f 4 V Y T (c) The extraction wells developed as part of the CAP shall be maintained and GRASSETTI ENVIRONMENTAL CONSULTING 1. ;