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Californiattegional Water Qualitocontrol Board - a Terry Tamminen Central Valley Region t _, _ Arnold Schwarienegger Secretary for Robert Schneider, Chair + x . i iiQ;; f ,'., Governor Environmental Protection 11020 Sun Center Drive #200 Rancho Cordova, CA 9567 1 (916) 464-3291 -Fax(916)464-4775 http://www.swrcb.ca.gov/rwgcb5 21 May 2004 Mr. Kevin Basso General Manager Forward Inc. 1145 West Charger Way Stockton, CA 95206 REVIEW OF DESIGN REPOR T, WASTE MANAGEMENT UNIT FU -04, FORWARD LANDFILL, SAN JOAQUIN COUNTY (CASE NO. 2209) We have reviewed the Design Report, Waste Management Unit FU -03 submitted on 7 May 2004. The report presents design drawings, engineering calculations, specifications, clay acceptance program and construction quality assurance procedures for new waste management unit (WMIJ) for solid waste, WMU FU -04. WMU FU -04 consists of northeast, central, and northwest portions that will be constructed sequentially. Staff may approve individual portions for waste discharge after review of a complete CQA report. The design report addresses the following issues: 1. Design of WMU FU -04 where the central portion will receive Class II solid waste, and the northeast and northwest portions will receive Class III solid waste constructed over the old Austin Road waste cell. The design includes base and final grades, liners, and leachate collection and removal systems; 2. WMU FU -04 is designed to control inundation, washout, erosion, and slope failure resulting from flooding caused by a 24-hour, 1,000 year storm; 3. Seismic hazard analysis indicates that the Forward Landfill site is not located within 200 feet of a Holocene fault and complies with the regulatory provisions regarding active faults; 4. Slope stability calculations to demonstrate that the design for WMU FU -04 will withstand the Maximum Credible Earthquake without damaging the liners or the leachate or surface drainage control systems; 5. The central portion has a design similar to adjacent WMU FU -03 and to other Class H units constructed at Forward over the previous 3 years; 6. The northeast portion will be constructed over the existing interim cover of Austin Road WMU. The design incorporates the existing 1 -ft thick clay layer and vegetative layer as its low permeability component and adds a leachate collection and removal system (LCRS) and an operations layer; and 7. WMU FU -04 will have a base liner, side slope liners and LCRS designed to conform to the requirements of Title 27, Subtitle D and the facility Waste Discharge Requirements. The central portion of WMU FU -04 liner consists of a 2 -ft. of compacted clay, overlain with a 60 -mil, HDPE geomembrane, and 1 -ft of gravel LCRS on the base.. The side -slope liner will substitute a geo- California Environmental Protection Agency 0, Recycled Paper