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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 12 October 2024 • The presence of carbon monoxide (CO) in the gas collected by the landfill gas collection system at levels that exceed 1,000 parts per million (ppm) • Substantial settlement over a short period of time • Smoke emanating from the gas extraction system or landfill • Combustion residue in landfill gas extraction wells and/or headers • Increase in gas temperature in the extraction system (above 140° Fahrenheit) • Temperatures in excess of 170° Fahrenheit in the waste Note that the County measures the concentration of CO at each well using portable detection equipment on a monthly basis. CalRecycle consider levels of CO in excess of 1,000 ppm to be a positive indication of an active underground landfill fire. Levels of CO between 100 and 1,000 ppm are viewed as suspicious and require further air and temperature monitoring. Levels between 10 and 100 ppm may be an indication of a fire but active combustion is not present. To date, CO has not been detected at the NCRCSL over 100 ppm at any well. Due to the landfill gas extraction systems at the NCRCSL, subsurface fires are considered a reasonably foreseeable casual event and therefore mitigation measures were evaluated as part of this NWRCAP. 4.3.2 Wildfires Wildfires have been documented to destroy or damage landfill monitoring systems, vegetation, and irrigation systems. The potential damage to a landfill caused by wildfires can vary significantly depending on the facility location, surrounding terrain, local weather conditions, and protective measures (such as fire breaks). CalRecycle’s BMP guidelines recognize the Department of Forestry and Fire Protection (Cal Fire) and local fire agencies for potential fire hazards. Landfills located within or adjacent to moderate/medium or high/very high fire hazard zones should be evaluated for potential damage due to wildfire. Based on a current review of Cal Fire’s Fire Hazard Severity Zone map for San Joaquin County, there have been no updates to the map. The current map shows that the NCRCSL falls under the responsibility of the local fire jurisdiction (see Figure 4) and is within an un-zoned area of fire hazard severity. Also, the landfill is surrounded by irrigated agricultural land and fuel for a wildlands fire is minimal. Due to the location of the NCRCSL, and designation of un-zoned fire hazard severity, wildfires are not considered a reasonably foreseeable causal event for this facility. 4.4 Flooding Impacts CalRecycle’s BMPs require evaluation of the landfill in relation to the 500-year flood zone,