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WASTE DISCHARGE REQUIREMENTS -8- SAN JOAQUIN COUNTY NORTH COUNTY SANITARY LANDFILL CLASS III LANDFILL SAN JOAQUIN COUNTY impairment of beneficial uses of water due to migration through the vadose (unsaturated) zone. ,017. Each module shall have a 60 mil High Density Polyethylene (HDPE) liner over compacted soil with a minimum thickness of six inches and permeability of 10" cm/sec. 18. Each module shall have a dendritic LCRS immediately above the liner, which is designed and operated to prevent the development of significant hydraulic head on the liner at any time. 19. Landfill leachate shall be discharged by a Board approved method. A plan for long term leachate disposal shall be submitted to the Board in accordance with the time schedule in Provision C.16. 20. Leachate generation by a landfill unit LCRS shall not exceed 85% of the design capacity of a) the LCRS or b) the sump pump. If leachate generation exceeds this value and/or if the depth of fluid in an LCRS exceeds the minimum needed for safe pump operation, then the Discharger shall immediately cease the discharge of sludges and other high-moisture wastes to the landfill unit and shall notify the Board in writing within seven days. Notification shall include a time table for corrective action. LANDFILL CLOSURE SPECIFICATIONS 21. The closure of the landfill shall be under the direct supervision of a California registered civil engineer or certified engineering geologist. 22. Closed landfills shall be provided with at least two permanent monuments, installed by a licensed land surveyor, from which the location and elevation of all wastes, containment structures, and monitoring facilities can be determined throughout the post-closure maintenance period. 23. At closure, each landfill unit shall receive a final cover which is designed and constructed to function with minimum maintenance and consists, at a minimum, of a two-foot thick foundation layer which may contain waste materials, overlain by a one-foot thick clay liner, and finally by a one-foot thick vegetative soil layer, or an engineered equivalent final cover approved by the Board pursuant to Subsections 2510(b) and (c) of Chapter 15. 24. Vegetation shall be planted and maintained over each closed landfill unit. Vegetation shall be selected to require a minimum of irrigation and maintenance and shall have a rooting depth not in excess of the vegetative layer thickness.