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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Steven T.Butler,Chair -a <br /> Winston H.Hickox Gray Davis <br /> Secretary for Sacramento Main Office N Governor <br /> Environmental Internet Address: http://www.swreb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 24 July 2000 ,a <br /> Mr. Kevin Basso <br /> General Manager <br /> Forward Inc. <br /> 1145 West Charger Way <br /> Stockton, CA 95206 <br /> REVIEW OF DESIGNAND CONSTRUCTIONOCUMENTS WASTEMANAGEMENT UNIT <br /> D-00, FORWARD LANDFILL, SAN JOAQUIN COUNTY(Case No. 2209) <br /> We have reviewed the Design and Construction Documents Waste Management Unit D-00 submitted by <br /> CH2M Hill on behalf of Forward Landfill. The report presents design drawings, engineering <br /> calculations, specifications, clay acceptance program and construction quality assurance procedures for <br /> construction of a new waste management unit (WMU) D-00. The report addresses the following issues: <br /> 1. Design of landfill liner and leachate collection and removal system; <br /> 2. The WMU is designed to control inundation, washout, erosion, and slope failure resulting from <br /> flooding caused by a 24-hour, 1,000 year storm; <br /> 3. A minimum 50-feet set-back creek easement; <br /> 4. Slope stability calculations to demonstrate that the design will withstand the Maximum Credible <br /> Earthquake without damaging the liner or the leachate or surface drainage control systems; and <br /> 5. Seismic studies completed in 1992 that indicate that the Forward Landfill site is not located <br /> within 200 feet of a Holocene fault and complies with the regulatory provisions regarding active <br /> faults. <br /> The landfill design includes a base liner and an interface and side slope line. The base liner system is <br /> composed of a 2-foot thick clay layer(conductivity< 10'cm/sec), overlain with a 60-mil thick, high- <br /> density polyethylene (HDPE) geomembrane. The base lining system complies with the Title 27 <br /> California Code of Regulations(CCR). The interface and side slope liner will consists of a Geosyenthic <br /> Clay Liner (GCL) overlain with a 60-mil thick, single sided textured HDPE geomembrane. The <br /> interface and side slope liner is an engineered alternative that complies with the facilities waste <br /> discharge requirements and that has been previously approved and used at other WMUs at Forward <br /> Landfill. <br /> The refuse fill stability analysis identifies two issues that must be presented in the final CQA report. <br /> 1. The maximum refuse height and slope for WMU D-00 should be re-evaluated based on actual <br /> CQA direct shear test results. <br /> 2. The dynamic stability calculations should be re-evaluated following construction using actual <br /> material properties. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />