CORRESPONDENCE_1990-1993 - Laserfiche WebLink

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WASTE DISCHARGE REQUIREMENTS -10- FORWARD INC.,FORWARD LANDFILL SAN JOAQUIN COUNTY to the unit. A record of the sealing and/or abandonment of such wells shall be sent to the Board and to the State Department of Water Resources. GENERAL WMU CONSTRUCTION 8. All containment systems shall include a leachate collection and removal system(LCRS)which shall convey to an appropriately lined sump or other appropriately lined collection area all leachate which reaches the liner. The LCRS shall not rely upon unlined or clay-lined areas for such conveyance. 9. Clay liners and landfill caps shall have a hydraulic conductivity of 10-7 cm/s or less and a minimum relative compaction of 90 percent.Hydraulic conductivities of liner materials shall be determined by laboratory tests using solutions with similar properties as the fluids that will be contained. Hydraulic conductivities of cap materials shall be determined by laboratory tests using water. Hydraulic conductivities determined through laboratory methods shall be confirmed by field testing in accordance with the Standard Provisions and Reporting Requirements as described in Provision D.1. 10. LCRSs shall be designed,constructed, and maintained to collect twice the anticipated daily volume of leachate generated by the WMU and to prevent the buildup of hydraulic head on the underlying liner at any time.The depth of fluid in any LCRS sump shall be maintained as low as feasible and no greater than the minimum needed for safe pump operation. PROTECTION FROM STORM EVENTS 11. Precipitation and drainage control systems shall be designed and constructed to accommodate the anticipated volume of precipitation and peak flows from surface runoff as follows: Classification Storm Size Class I WMUs Probable maximum precipitation Class II WMUs 1,000-year, 24-hour Class III WMUs 100-year, 24-hour 12. Waste management units shall be designed, constructed, and operated in compliance with precipitation and flood conditions contained in the Standard Provisions and Reporting Requirements referenced in Provision D.1, below. 13. 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 of the site and to prevent surface drainage from contacting or percolating through wastes.