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California Regional Water Quality Contgal Boarda Central Valley Region <br /> Robert Schneider,Chair <br /> Linda S.Adams Arnold <br /> Secreraryfor Sacramento Main Office Arnold <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Governor <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 +- <br /> http://www.waterboards.ca.gov/centralvalley2 -AUG Z-1 1' 4 <br /> 18 August 2006 'ENVIRONMENTAL <br /> T A <br /> HEALTH DEPARTHENT <br /> Mr. Kevin Basso <br /> General Manager <br /> Forward Inc. <br /> 1145 West Charger Way <br /> Stockton, CA 95206 <br /> PROPOSED CHANGES TO INTERFACE/PIGGYBACK LINER DESIGN, FORWARD <br /> LANDFILL, SAN JOAQUIN COUNTY <br /> Regional Water Board staff has reviewed the RE: Interface/Piggyback Liner, Forward Landfill <br /> (memo) submitted by Lewis Engineering on 16 August 2006. The memo proposes to make <br /> changes to the design of the Interface liner between the existing unlined Austin Road Class III <br /> solid waste unit and the under construction, composite lined FU-06 Class II/III solid waste unit. <br /> The previous design (termed a piggyback liner) placed Class III waste on the top deck of the <br /> Austin Road unit and extended a composite interface liner from the toe of the Class III unit to <br /> the final fill height. The revised design would stop the interface liner at the height of the <br /> existing Austin Road unit top deck. Air space over the Austin Road unit footprint and above <br /> the elevation of the top deck will be filled with Class III waste. <br /> Staff believes that the proposed revised design provides equivalent water quality protection as <br /> the piggyback design and therefore, concurs with the proposed revision. Plans showing the <br /> revised design details (anchor system, tie between top deck and side slope LCRS, etc.) should <br /> be submitted for staff review. <br /> We recall that the piggyback design was a compromise to installing a HDPE membrane over <br /> the Austin Road top deck. If we are doing away with the piggyback design, installing a <br /> composite liner over Austin Road unit for the Fu-07 unit should be re-considered. <br /> If you have any questions, please call me at (916) 464-4614. <br /> ROSS D. ATKINSON <br /> Associate Engineering Geologist <br /> cc: Robert McClellon, San Joaquin County LEA, Stockton <br /> Randy Fridlander, CIMWB, Sacramento. <br /> Reuben Ramirez, Forward Landfill Operations Manager, Stockton. <br /> Sangeeta Lewis, Lewis Engineering, Piedmont. <br /> Lochlin Caffey, Forward Inc. Stockton <br /> RDA;W:\staff\atkinsrWlyDocume nts\Forward\pig ba cLi ner.doc <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />