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<br /> <br />Foothill Sanitary Landfill Page 23 of 53 San Joaquin County DPW - Solid Waste <br />Joint Technical Document Revised 6/09/2020 <br /> <br />Within each collection trench will be a 6-inch diameter perforated High Density Polyethylene <br />(HDPE) pipe used to collect the leachate and transmit it to the collection sump. This pipe <br />provides a large cavity for leachate to flow freely to the sump. It also provides redundancy in <br />the overall LCRS system. If the pipe were to fail over time, the permeability of the gravel <br />drainage layer would suffice to transmit the leachate to the sump. <br /> <br />The sump of the LCRS will be constructed with a sideslope riser system. This sideslope riser <br />system allows for a pump to be placed into the sump area for ultimate extraction of the leachate <br />for disposal <br /> <br />5.5.3. Collection and Removal <br />The main leachate collection drains were sized to carry a minimum of "twice the maximum <br />anticipated daily volume of leachate," as required under 27 CCR 20340(b). This will be <br />achieved with a minimum cross-slope of 1.4 percent. The lateral collection drains will have a <br />minimum slope of 1 percent. A comprehensive construction quality assurance program was <br />developed that establishes criteria for proper grade control and spacing of lateral collection lines <br />during construction. The liner and LCRS for the landfill will be constructed in incremental <br />phases. All operational components of the LCRS within each phase will be in place prior to <br />refuse being placed in that cell. Each phase will be either independent or compatible with <br />preceding phases. <br /> <br />The leachate collection pipes are constructed with risers that extend to the perimeter of the <br />landfill. During the initial operations of each module, the risers will allow for camera or other <br />means of inspection. As the landfill expands, the risers that have been constructed at the <br />interior of the landfill will be decommissioned. The pipe risers at the exterior perimeter of the <br />landfill will be accessible during the life of the landfill for inspection of the LCRS system. These <br />risers will enable devices such as cameras or cleanouts to be inserted into the LCRS system to <br />check for clogging or the removal of clogs, respectively. <br /> <br />Final designs for each module for sequential liner and LCRS construction will be prepared and <br />submitted for review and approval to the appropriate regulatory agencies prior to construction.