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Gary A. Reents 2 24 April 1989 <br /> placement and compaction of wastes to ensure that the riser <br /> pipes are not damaged. An alternative that should be <br /> considered, is the redesign of the floor of the burial chamber <br /> to provide for perimeter sumps, and the burial of the riser <br /> pipes within the 2 : 1 side slope walls of the chamber. This <br /> exterior riser pipe design will eliminate the construction <br /> problems associated with the interior design. The exterior <br /> pipes will have to be designed to resist the live loads <br /> associated with the filling and compaction operations, as well <br /> as the dead loads of the fill and lumber storage facilities, <br /> and surface traffic loads. <br /> 4 . In Detail 8/3 of the design drawings; the geotextile fabric <br /> is shown as being lapped over the riser pipe flange. This <br /> lapping seems fairly insecure, and could result in the <br /> infiltration of the overlying sand fill into the riser pipe <br /> if the lapping slips and/or if the fabric is torn on the <br /> stainless steel bolts holding the pipe flange to the base <br /> plate. It is recommended that a more effective method be used <br /> to ensure that the geotextile fabric does not fail at this <br /> crucial point in the leak detection and leachate collection <br /> system. One possibility would be to cut the geotextile fabric <br /> to fit over the bolt ends and secure the fabric with the nuts. <br /> 5. The contractor' s Waste Stabilization Plan should be submitted <br /> to this office for review. <br /> If you have any questions regarding these comments, please contact <br /> John Tomko at (916) 361-5670. <br /> C *6w,7 <br /> Gary A. Reents <br /> Senior Engineer <br /> CC. Mr. James Austreng, Department of Health Services, Sacramento <br /> his. Laurie Cotulla, San Joaquin Local Health District, <br /> Stockton <br /> Mr. Tom Hickey, Black and Veatch, Missouri <br />