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f <br /> 771-'NTOR <br /> ACOIL11 <br /> ENGINEERING, INC. <br /> September 3, 2002 <br /> Job No. 021605.00 <br /> Mr. Ross Atkinson <br /> Central Valley Water Quality Control Board <br /> 3443 Routier Road <br /> Sacramento, California 95827 <br /> Re: Interim Construction Certification Letter, Waste Management Unit D-02 <br /> Construction at the Forward Landfill <br /> Dear Mr. Atkinson, <br /> Vector Engineering, Inc. (Vector) of Grass Valley, California has completed the <br /> construction quality assurance (CQA)field observation and testing associated with the <br /> construction of Waste Management Unit D-02 (WMU D-02) at the Forward Landfill. <br /> Based on our field work, it is Vector's opinion that WMU D-02 has been completed in <br /> general accordance with the "Construction Documents,Waste Management Unit D-02, <br /> Forward Landfill", prepared by Lewis Engineering, and subsequent <br /> recommendations/revisions provided by the project engineer. <br /> The composite liner system for WMU D-02 consists of the following components (from <br /> bottom to top): <br /> Floor of Cell <br /> • Excavated and prepared subgrade; <br /> • 24-inches of low-permeability soil liner; <br /> • 60-mil single-sided textured geomembrane; <br /> • 12-inches of granular drainage layer; <br /> • geotextile; and <br /> • 12-inches of protective operations layer. <br /> West Sideslope <br /> • Excavated and prepared subgrade; <br /> • Geosynthetic clay liner (GCL); <br /> • 60-mil single-sided textured geoembrane; <br /> • Geocomposite drainage layer; and <br /> • 12-inches of protective operations layer placed 10 feet vertically up the slope <br /> (the remainder to be placed during operations). <br /> During the construction, Vector provided a construction quality assurance monitor that <br /> observed and tested the earthworks and geosynthetic portions of the project. In order for <br /> refuse to be placed within the WMU D-02 area, the liner system must be installed and <br /> tested to ensure compliance with the project plans and specifications. As part of the CQA <br /> inspection services at the site, Vector evaluated and observed the preparation of the <br /> 143E Spring Hill Drive • Grass Valley,CA 95945 • (530) 272-2448 Fax: (530) 272-8533 <br /> USA•ARGENTINA 9 BRAZIL•CHILE•PERU•PHILIPPINES <br />