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743 Kearney Street, <br />4VAIAUE 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 />Foiivard 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 l --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 I(DPE geomennbrane (GSE); <br />• Drainage geonet with a leak detection system; <br />• Secondary 60 -mil thick double -sided textured HDPE geomembrane (GSE); <br />• Geosynthetic clay liner (G(I.), manufactured by GSI -, 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 ►ny enquiry of <br />those persons directly responsible for gathering the information, the information submitted is, to the best of <br />►ny knowledge and belief, true, accurate, and complete. <br />Please call me if there are any questions regarding this letter. <br />Sincerely, <br />VALUE ENGINEERING <br />Sunil K�ni PhD, PE, GE <br />Principal Engineer <br />www.vaIuengineering.us <br />