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North County Recycling Center & Sanitary Landfill Department of Public Works/Solid Waste First Semiannual 2025 Groundwater Monitoring Report ©2025 COUNTY of San Joaquin. All Rights Reserved 17 9 LEACHATE COLLECTION AND RECOVERY SYSTEM Leachate is collected in the Leachate Collection and Recovery Systems (LCRSs) of the four landfill Areas. This leachate is returned to the refuse in accordance with the WDRs for this site. Landfill gas condensate is pumped into the LCRS of Area 4, and is handled as leachate also in accordance with the WDRs. The semi-arid climate of the North County Landfill and the waste shed from which the refuse is collected provides dry refuse in which the leachate can be absorbed. Leachate quantities do not typically indicate significant intrusion of water, or difficulty in meeting regulatory limits. Normal operation of the leachate system at the North County Landfill provides redundancy in absorption. Leachate may be pumped to the deep infusion points, to a leachate storage tank, or to the active landfill face if the active face is over Area 3, 4 , 5, or other future lined Areas. 9.1 Facilities The leachate facilities for each Area include:  Sump with dedicated leachate pump. The sump pumps are equipped with automatic controls and a sump level indicator.  Volumetric flow meter for the sump pump, indicating total gallons pumped and flowrate measuring dial.  Leachate storage tanks. These tanks are normally not in use but are available if leachate cannot be returned to the refuse directly from the sump. o Areas 1 and 3 sumps share one tank (3,000 gallons) o Area 4 and 5 sumps share one tank (12,000 gallons). The tanks have the following features: o Float switches that activate alarms based on high or low level conditions. Under high-level conditions, the leachate sump pumps are deactivated. This prevents overflow of the tanks. o Under low-level conditions, pumps that can remove leachate from the tanks are deactivated, preventing the operation of these pumps with insufficient fluid. o Transfer pumps at each leachate tank that can deliver leachate into a water truck, if needed. o Return pump at the Area 4 leachate tank delivers leachate to the infusion point or into a water truck, if needed. Permanent points of return of leachate to the refuse include three Deep Infusion Points (“dry” wells), with two dry wells over Area 4 and one over Area 3 and Area 5. The highest elevation of the base of Area 3 in this area is approximately 96 feet NAVD 88. The bottom of these Deep Infusion Points (DIPs) are approximately at elevation 140 feet NAVD 88. Approximately 50 feet of refuse in multiple lifts exists between the point of infusion and the base of the landfill.