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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2003-0049 -16- FORWARD INC. AND ALLIED WASTE INDUSTRIES FOR OPERATION OF FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY 3. Water used for facility maintenance shall be limited to the minimum amount necessary for dust control, and construction. 4. The Discharger shall maintain in good working order any facility, control system, or monitoring device installed to achieve compliance with the waste discharge requirements. 5. Methane and other landfill gases shall be adequately vented,removed from the Unit, or otherwise controlled to prevent the danger of adverse health effects,nuisance conditions, or the impairment of the beneficial uses of surface water or groundwater due to migration through the unsaturated zone. The existing landfill gas extraction system shall be expanded as new units are opened so that all active or filled units are within the area of influence of the system. 6. Surface drainage within the waste management facility shall either be contained on-site or be discharged in accordance with applicable storm water regulations. 7. The Discharger shall maintain a Storm Water Pollution Prevention Plan and Monitoring Program and Reporting Requirements in accordance with State Water Resources Control Board Order No. 97-03-DWQ, or retain all storm water on-site. 8. Precipitation and drainage control systems shall be designed, constructed, and maintained to accommodate the anticipated volume of precipitation and peak flows from surface runoff under 1000-year, 24-hour precipitation conditions for Class II WMUs and 100- year, 24-hour precipitation conditions for Class III WMUs. 9. Annually, prior to the anticipated rainy season, any necessary erosion control measures shall be implemented, and any necessary construction,maintenance, or repairs of precipitation and drainage control facilities shall be completed to prevent erosion or flooding and to prevent surface drainage from contacting or percolating through wastes. 10. The Class II Landfill shall be designed to withstand the maximum credible earthquake without damage to the foundation, or to the structures which control leachate, surface drainage, erosion, or gas. 11. A system of landfill gas monitoring points shall be installed that are sufficient to detect gas escaping from the landfill. Gas control measures shall be implemented for a Class II landfill module upon the detection of methane and gas-phase concentrations of volatile organic compounds (VOCs) in landfill gas monitoring points. The gas control measures shall be sufficient to prevent the gas-phase migration of VOCs from the Class II modules.