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Modules 1 and 3 North County Recycling Center and Sanitary Landfill The purpose of this report is to: • Describe the current condition and operational controls of the Leachate Collection and Recovery System (LCRS) at the North County Recycling Center and Sanitary Landfill. • Describe the operation after Module 1 and 3 sumps are automated. • Present a workplan and schedule for upgrading Module 1 and 3 sump pumps to automatic operation. The dry climate of the North County Recycling Center and Sanitary Landfill allows leachate to be returned to the landfill, where it is absorbed by the dry refuse. Overwhelming of the LCRS due to excessive recirculation would be indicated by the inability of a leachate sump pump to empty the sump or to maintain the leachate level below the one -foot maximum head allowed. Leachate seeps on the side of the fill would be an indication that the refuse has become saturated. These conditions have not been observed, so we believe that the relatively small amount of leachate generated at this landfill can be returned to the refuse without negative impact to the LCRS. AT-TWUMSIVOW Facilities The leachate collection and recovery system for Modules 1 and 3 includes (Figure 1): ■ Sumps with dedicated pumps for Module 1 and Module 3. ■ Volumetric flow meter for each leachate sump pump, indicating total gallons pumped. ® A 3,000 gallon leachate storage tank at the southwest corner of Module 1. This tank is provided with high level and low level (float) sensor, and with a high-level alarm sensor. ■ Discharge pump located on the storage tank. Module 1-3 LCRS Pump Control Upgrade North County Recycling Center and Sanitary Landfill May 26, 2010 San Joaquin County