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WMU D-99 Construction September 1999 <br /> Forward Landfill Job No.986011.02 <br /> 6.0 CONCLUSION <br /> The completion of construction work requiring CQA observation occurred on <br /> September 2, 1999. Based on our observations and testing during the construction of <br /> WMU D-99, the Eastern Ash Pit Closure, and the Class II Leachate Impoundment, it is <br /> Vector's professional judgement that the construction was completed in general <br /> accordance with the project plans and specifications, CQA plan, and applicable <br /> regulations, with the following minor modifications: <br /> • Modify the liner ballast from the current cement-filled tires to a 1-foot thick layer of <br /> on-site silty sandy soil uniformly placed over the impoundment base. <br /> • Modify the wind vents from the hooked pipes shown on the construction drawings to <br /> the patch-type wind vent shown on the attached detail. The patch-type wind vents <br /> will be located 1 foot vertically downward from the pond crest and spaced laterally <br /> at 50-foot centers. <br /> Vector Engineering, Inc. • 12438 Loma Rica Dr., #C • Grass Valley, CA • (530)272-2448 <br /> -20- <br />