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WMU D-99 Construction September 1999 <br /> Forward Landfill Job No.986011.02 <br /> Vector's CQA Monitor observed the smooth drum rolling procedure and <br /> advised the Contractor of areas where ridges or rough areas were present so that <br /> these areas could be reworked. The surface of the compacted clay liner was also <br /> observed for potential desiccation cracking. Once the surface preparation was <br /> complete, the area was approved for geomembrane placement. <br /> 4.4 Leachate Collection and Removal System Drainage Layer <br /> Granular leachate collection and removal materials were installed over the <br /> geomembrane in the floor portion of WMU D-99. Additionally, a LCRS trench was <br /> constructed along the centerline of the unit in the east-west direction, draining to a <br /> sump. The LCRS trench consisted of perforated HDPE pipe encapsulated with coarse <br /> gravel and geotextile. <br /> A leachate detection sump and an HDPE riser pipe were constructed in the <br /> southeast corner of the Class II Leachate Impoundment. The detection sump consisted <br /> of perforated HDPE pipe encapsulated with coarse gravel and geotextile. <br /> Vector's Grass Valley laboratory performed hydraulic conductivity (AST <br /> D-2435) and grain size analysis (ASTM C-136) on the granular materials used for both <br /> WMU D-99 and the Class II Leachate Impoundment. The materials placed met the <br /> requirements of the specifications. A small amount of the granular material was found <br /> to have excessive fines and that load was rejected. Results of the laboratory testing <br /> are included in Appendix I. <br /> Drainage materials were brought to the edge of the geomembrane by end-dump <br /> trucks. The material was then pushed forward over the geomembrane with low ground <br /> pressure dozers. At no time during this operation was the equipment allowed to come <br /> into contact with the geosynthetic layers. Vector's Monitor was present during the <br /> placement of the material on top of the geomembrane and did not observe any damage <br /> to the geosynthetics. <br /> The material was placed in one lift and graded with a dozer to the specified <br /> grades and elevations. Thickness verification of the LCRS layer was performed by <br /> survey and potholing is included in Exhibit 4. <br /> Vector Engineering, Inc. • 12438 Loma Rica Dr., #C • Grass Valley, CA• (530)272-2448 <br /> -9- <br />