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North County RC&SL Page 25 of 64 Public Works/Solid Waste Joint Technical Document County of San Joaquin – Revised July 14, 2025 5.3.3 Fill Sequencing Plans The NCRC&SL is currently planned to be developed in approximately eleven Lined Areas. Development of the areas would be in the sequential, counterclockwise numerical order (Plate 6 and Appendix B Drawing 3). Detailed design plans for each area will be submitted to the appropriate regulatory agencies for review prior to the construction of each lined area. Currently, MSW is being placed in Lined Area 5A, 5B and Area 6 with area 7 serving as the soil borrow area. The County intends to fill Areas 1 through 6 to near final maximum permitted elevation in accordance with the revised permit height. Area 7 will be constructed in advance of Areas 1-6 reaching their permitted refuse fill capacity. The next landfill area will then become soil borrow area for daily cover. This process will be repeated for the remaining Areas 7 through 11 (See Appendix B, Preliminary Closure/Postclosure Maintenance Plan for fill sequencing). It is presently contemplated that soil will be stockpiled in the eastern mitigation area to provide daily cover for the final Lined Area and closure of any un-closed landfill surfaces (Plate 6). Note that the orientation and limits of Areas 7 and 8 maybe adjusted during final design. 5.4 LEACHATE COLLECTION AND REMOVAL SYSTEM All lined areas will have a leachate collection and recovery system (LCRS). Leachate collection systems include collection troughs with lateral and header piping surrounded with drainage gravel. Each lateral leachate pipe will be equipped with a pipe riser for inspection and cleaning if necessary. Leachate will drain along the troughs in the LCRS laterals to a leachate sump. The sumps will include one or more pumps with sensors and automatic controls to maintain a low leachate level. Above-ground leachate storage tanks are and will be used as needed to receive leachate pumped from the sump. All leachate will be returned to the landfill in accordance with the WDRs (Appendix A). 5.5 SURFACE WATER DRAINAGE AND EROSION PLANS Final surface drainage will conduct rainwater north to the mitigation area and wetlands and to the discharge points at the west and south property boundary (Appendix B, Drawing 1). Temporary drainage will be managed as described in Section 6.8. As the landfill surface changes over time and as appropriate, the County will design and construct temporary surface water drainage features to control runoff and erosion, and to deliver runoff to