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RECEIVEC_'; -y <br /> GAVIN NEWSOM <br /> so0S ^ 1 '� GOVERNOR <br /> C 11 L I F 0 A M I• ENVIRONMENTAL HEAL)-H 11 FIE e`OMENFE LD <br /> SECRETARY FOR <br /> Water Boards PERMIT/SERVICES ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 25 January 2019 <br /> Taj M. Bahadori, P.E. <br /> San Joaquin County Department of Public Works <br /> P.O. Box 1810 <br /> Stockton, California 95201 <br /> REQUEST FOR MODIFICATION OF LINER ENGINEERED ALTERNATIVE DESIGN, WASTE <br /> DISCHARGE REQUIREMENTS ORDER R5-2015-0058;FOOTHILL LANDFILL, SAN JOAQUIN <br /> COUNTY <br /> Central Valley Water Board staff reviewed the 8 May 2018 technical report Leachate Collection <br /> and Removal System (LCRS) Engineered Alternative Design Report, Foothill Sanitary Landfill <br /> Module 2B (Liner EAD Report). The report requests approval for modification of the leachate <br /> collection and removal system (LCRS) component of the liner design for Landfill 2, Module 2B and <br /> future LF-2 modules. WDR Construction Specification DA specifies the following engineered <br /> alternative design (EAD)for LF-2 module liners (WDR table footnotes excluded): <br /> Component Base Liner Side Slopes <br /> Excavation LF-1/1-F-2 Interface <br /> Operations Layer >_2 feet soil <br /> Filter Fabric Geotextile <br /> 9-inch gravel layer <br /> LCRS <br /> Appropriately-sized HDPE Geocomposite <br /> collection piping in drainage <br /> troughs <br /> 60-mil HDPE None <br /> Base Liner <br /> Geosynthetic Clay Liner(GCL) <br /> Foundation Layer >_ 1-foot prepared subgrade <br /> The attached drawing (Attachment 1) shows a cross-section of the existing liner design for <br /> Module 2A and that proposed for Module 2B and future LF-2 modules. The Discharger is <br /> requesting approval of the proposed liner EAD modification per WDR Construction <br /> Specification D.6, which requires a demonstration of the following factors to the satisfaction of <br /> the Executive Officer: <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PATRICK PULUPA, ESO., EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley <br /> C.*RECYCLED PAPER <br />