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Non-Water Release Corrective Action Plan North County Recycling Center and Sanitary Landfill AU24.1294.00 | Non-Water Release Corrective Action Plan Update 3 October 2024 runoff collects in depressed areas placed around the perimeter of the landfill. Collected runoff in these areas is pumped to the interim sedimentation basin. The current final grading plan for the NCRCSL is shown in Figure 2. 3.0 LANDFILL CONFIGURATION This section of the NWCAP describes the existing landfill environmental control systems and surface water control systems. 3.1 Landfill Gas Migration Monitoring and Control System The NCRCSL has a perimeter landfill gas migration monitoring system that consists of 18 triple- probe soil gas wells (SG-1 through SG-18). It is anticipated that three other single-probe soil gas wells (SG-5, SG-6, and SG-7) will be decommissioned prior to closure. The site also has a landfill gas control system that consists of a series of 13 horizontal gas extraction wells (HC-1 through HC-13) and 7 vertical gas extraction wells (GX-1 through GX-7). The horizontal wells have been installed (but, are not connected) to provide supplemental extraction of landfill gases after closure if the vertical extraction wells cannot control landfill gas emissions. 3.2 Groundwater Monitoring System Water quality is monitored consistent with WDR Order No. R5-2010-0016. The groundwater monitoring network presently consists of six groundwater monitoring wells. It is anticipated that approximately four additional groundwater monitoring wells will need to be added during the operational life of the landfill prior to closure, providing a total of ten groundwater monitoring wells to be maintained and monitored during the post-closure period (Shaw, 2010). 3.3 Surface Water Controls As described above, stormwater run-off from the landfill is controlled by a series of top-deck berms, side-slope benches, downdrain pipes, and perimeter drainage ditches. Most of the runoff from the landfill is conveyed to an interim sedimentation basin to the east side of the site. The remaining runoff collects in depressed areas placed around the perimeter of the landfill. Collected runoff in these areas is pumped to the interim sedimentation basin. Stormwater run-on from a tributary of South Paddy Creek enters from the east and is diverted into the mitigation area at the north side of the site and when full, exists to the west. The permanent stormwater run-off and drainage control facilities were designed to carry the peak discharge resulting from a 100-year, 24-hour storm event, as required by 27 CCR, Section 20320 for a Class III waste management unit. 4.0 REASONABLY FORESEEABLE NON-WATER IMPACTS The following scenarios of non-water impacts associated with known or reasonably foreseeable site damage scenarios have been developed in accordance with CalRecycle’s BMPs for Preparing Site-Specific Non-Water Quality Corrective Action Plans (CalRecycle, 2010).