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743 Kearney Street, <br /> VALUE Benicia, CA 94510 <br /> Ph. : 707 7719009 <br /> ENGINEERING Fax: 707 747 9996 <br /> September 15, 2011 <br /> Mr. Don Litchfield <br /> Environmental Manager <br /> Forward Landfill <br /> 9999 S. Austin Road <br /> Manteca CA 95336 <br /> Forward Landfill Inc. WMU F-West Leachate Impoundment <br /> Liner Compatibility with Cannery Wastewater <br /> Dear Mr. Litchfield: <br /> We have completed our review of the chemical data of the cannery wastewater for the leachate <br /> impoundment WMU F-West located at the Forward Landfill, Manteca, CA. Based on the cannery <br /> wastewater chemical analysis that you furnished (see Attachment 1), a review of the liner system design of <br /> the leachate impoundment WMU F-West indicates that it is compatible with the wastewater. The liner <br /> system of WMU F-West consists of a composite double-liner system with a leak detection and removal <br /> system. The liner system consists of the following components(from top to bottom): <br /> ® Primary 60-mil thick single-sided textured HDPE geomembrane (GSE); <br /> • Drainage geonet with a leak detection system; <br /> • Secondary 60-mil thick double-sided textured HDPE geomembrane(GSE); <br /> • Geosynthetic clay liner(GCL), manufactured by GSE;and <br /> • Prepared subgrade. <br /> GSE geomembranes are made of high quality, virgin polyethylene which demonstrates excellent chemical <br /> resistance, making it the liner material of choice for such applications.The impoundment liner system is <br /> designed to be compatible with the cannery wastewater chemistry, and no degradation is expected. <br /> This document and all attachments were prepared in accordance with a system designed to assure that <br /> qualified personnel properly gathered and evaluated the information submitted. Based on my enquiry of <br /> those persons directly responsible for gathering the information,the information submitted is,to the best of <br /> my knowledge and belief,true, accurate, and complete. <br /> Please call me if there are any questions regarding this letter. <br /> Sincerely, <br /> VALUE ET�,GINEERING <br /> Sum Kishnani, PhD, PE, GE <br /> Principal Engineer <br /> www.valuengineering.us <br />