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Interim Stormwater Systems (Segment 1 east sideslope) <br />The proper upslope diversion of stormwater collected over the sideslope liner is crucial <br />in the success of solid waste filling operations in the infill segment and for the <br />minimization of leachate. The sideslope liner will be installed by a contractor, and a <br />minimum of two feet of protective sand will be placed over the HDPE liner to elevation <br />40 feet NGVD. The portion of the sideslope liner above 40 feet NGVD will not be <br />covered with sand during the initial construction project. The side anchor berms of the <br />sideslope liner will have pipe penetrations of approximate elevations 40, 50, 60, 70, 80, <br />and 90 feet NGVD for removal of collected stormwater. One pipe penetration will be <br />installed at north and south anchor berms of the sideslope liner at the above referenced <br />elevations. The Contractor will install a diversion dam made of interlocking concrete <br />traffic barriers at the lower edge of the 40 foot elevation 6:1 slope ledge. The traffic <br />barrier diversion dam is to be placed on a minimum 16 ounce geotextile or a friction <br />pad over the textured liner. The sand layer will be increased to a minimum height of 3 <br />feet downslope of the traffic barriers to provide stability. <br />Precipitation falling in the sideslope liner will be collected in a north -south channel <br />immediately upslope of the traffic barriers. The channel will be sloped from the center <br />of the sideslope liner toward the north and south liner anchor berms. The channel will <br />discharge through the pipe penetrations located at the 40-, 50-, 60-, 70-, 80-, and 90 -foot <br />elevations. The pipes exiting the sideslope berm connect to letdown pipes buried in the <br />sideslope liner berm. The letdown pipes discharge to manhole structures which will <br />empty either to the north Segment 1 perimeter ditch or the stormwater pond. <br />A 24 -inch diameter smooth wall HDPE pipe is used for the Segment 1 northeast corner <br />letdown. The 24 -inch pipe letdown will be part of the permanent stormwater control <br />system following filling of the infill. A riser inlet will intercept stormwater runoff for a <br />416.1.143 1411112 snlitikiWMASVA <br />• <br />F-27 <br />,�j�}V!Y}�. i1�i'��+:<�lr,Tj-`.:�Y4�=i:Y; :FI��.IiT�,:j •f' <br />.. ... '-It <br />