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I 0 ia h California Regional Water Quality Control Board Terry Tamminen Central Valley Region + Secretaryfor Arnold Schwarzenegger Environmental Robert Schneider, Chair Governor Protection 11020 Sun Center Drive #200 Rancho Cordova, CA 95670-6114 (916) 464-3291 - Fax (916) 4644775 http://www.swrcb.ca.gov/rwgcb5 24 February 2004 Mr. Kevin Basso General Manager Forward Inc. 1145 West Charger Way Stockton, CA 95206 ENVIloiWENT HEALTH PERMIT/SERVICES REVIEW OF FINAL CONSTRUCTION QUALITY ASSURANCE REPORT, WMU FU -03, WMU F -WEST LEACHATE IMPOUNDMENT AND DESILTING BASIN, FORWARD LANDFILL, SAN JOAQUIN COUNTY We have reviewed the Final Construction Quality Assurance Report, WMUFU-03, WMUF- West Leachate Impoundment and Desilting at the Forward Landfill submitted on 13 February 2004 and results of the final survey submitted via FAX on 23 February 2004. The report with final survey results document construction and CQA procedures for the new Class H Waste Management Unit (WMU) FU -03, a Class II surface impoundment WNW F -West for landfill leachate, and a storm water retention and de -silting pond. FU -03 consists of from bottom to top on the floor a prepared subgrade, a minimum 2 -foot compacted clay liner, 60 -mil HDPE geomembrane, a minimum 1 -foot of granular drainage layer, 8-oz/yd2 filter fabric, and minimum 1 -foot operations layer; and on the side slope a prepared subgrade, a Geosynethetic clay liner (GCL), a geocomposite drainage material and a minimum 1 -foot operations layer (constructed in 10 -foot lifts as the unit fills). Where the unit is constructed over the capped Austin Road Landfill the liner consists of 5 -feet of engineered fill, GCL, 60 -mil HDPE, a geocomposite drainage layer and a minimum 1 -foot thick operations layer (to be placed as needed during operations). The report addresses: preparation of the subgrade; construction of a compacted clay liner; installation of Geosynethetic clay liner on side slopes; placing HDPE geomembrane to form a composite base liner; constructing a LCRS of geocomposite drainage net on the side slopes and gravel drainage blanket on the base; constructing LCRS sumps; and placing the soil operations layer. F -West is a 1 -acre leachate impoundment and consists of a prepared subgrade; a GCL; 60 -mil HDPE; a drainage geonet; and a upper 60 -mil HDPE. The storm water de -silting basin is a 1.5 acre unlined pond with an outlet structure. Vector Engineering conducted the CQA observations and testing during construction of the waste management unit. Vector states that the composite liner system has been constructed in accordance with the plans and specifications with approved clarifications and modifications, Title 27 and Consturction Quality Assurance Manual WMU FU -03. Based on the CQA report, on supporting test Cali ornia Environmental Protection Agency 0 Recycled Paper