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INTRODUCTION A Construction Quality Assurance (CQA) program consists of selected testing, inspection and documentation of a final construction product in order to provide the Owner/Agencies an evaluation of whether the end product is of the specified quality of materials and workmanship. Because of possible conflicts of interest, the Contractor should not undertake the CQA function directly. Rather, CQA inspection and testing should be left under the objective authority of a single team of design and inspection professionals. A Construction Quality Control (CQC) program consists of selected tests and inspections performed by the Contractor during production, which can assist the Contractor in producing the quality product required. While the CQC function is the sole responsibility of the Contractor, the Project Manager may, at his/her discretion, provide information regarding the ongoing CQA monitoring for the Contractor's use in implementing his/her CQC function. Release of the CQA data to the Contractor would be for convenience only and would, in no way, relieve the Contractor from the responsibility to fulfill the project requirements. Construction of final cover improvements for the Forward Landfill consist of constructing individual discrete layers of earth and synthetic materials which will function as a unit to form the containment system for the waste management area. As proposed, the final cover for the Forward Landfill will consist of from bottom to top: placement of a 2 -foot thick foundation layer composed of random soil materials; installation of very flexible polyethylene (VFPE) geomembrane over prepared subgrade; installation of a one (1) -foot wide HDPE geosynthetic drainage strips on approximately 10 foot centers, diagonal to contours on relatively flat deck areas; and placement of a two (2) -foot thick vegetative soil layer. Each of these components functions as an integral part of the final cover system and consequently must become "a"finis'hed project during the course of construct. As.,a result, it is important that each layer or component of the cover system be completed to the design specifications prior to construction of successive or overlying layers. For this reason, it is both inefficient and impractical to withhold CQA testing until completion of the cover and it is necessary to conduct an ongoing CQA program during construction to verify a quality end product. This document presents the geotechnical CQA criteria for construction of the earthwork and geosynthetic portions of the final cover system for the Forward Landfill in San Joaquin County, California. This CQA Plan is to be used in conjunction with the Project Drawings and Specifications to ensure that the proposed final cover system is constructed in accordance with applicable regulatory guidelines. -1- CA2001-048T IN AL COVER CQA.DOC\08/20/01 Geologic Associates