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North County RC&SL Page 46 of 64 Public Works/Solid Waste Joint Technical Document County of San Joaquin – Revised July 14, 2025 6.8.11 Landfill Gas Control 6.8.11.1 Subsurface Landfill Gas Migration Monitoring and Control The County ensures that the concentration of landfill-generated methane gas does not exceed the lower explosive limit for methane (5% by volume) at the migration monitoring perimeter, and that the concentration of methane gas does not exceed 25 percent of the lower explosive limit (1.25% by volume) in on-site structures. Combustible gas migration is monitored in accordance with the Landfill Gas Monitoring Plan (Appendix I). Control of LFG migration is provided by an active landfill gas collection system, operated in accordance with San Joaquin Valley AQMD Permit to Operate. 6.8.11.2 Emissions Control Control of emissions and protection against groundwater contamination is provided by a landfill gas collection system, operated in accordance with San Joaquin Valley AQMD Permit to Operate. 6.8.12 Odor Nuisance Control As discussed in Section 6.4 and 6.8, waste is covered with daily cover and intermediate cover to control nuisances including odor. The County also reserves the right to refuse loads that, in their opinion, will cause unwanted operating problems such as odors. The LFG collection system minimizes the odorous gas that may emit from the surface. Public odor complaints may be submitted to the County via mail, telephone, email, or fax. Telephone calls are directed to the landfill supervisor. If the citizen desires to generate a record of complaint, they can prepare a written complaint that will be kept on file at the County. The County investigates each complaint and, if appropriate, takes the necessary corrective action. The County responds to each complaint either via telephone or mail.