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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0123 -7- H.M. HOLLOWAY, INC. H.M. HOLLOWAY SURFACE MINE LANDFILL PROJECT KERN COUNTY compliance must be met in waste discharge requirements or orders for the discharge of waste at solid waste disposal facilities. 46.The Discharger proposes to construct a waste containment system which will be designed, constructed, and operated to prevent degradation of waters of the state during disposal operations, closure, and the post-closure maintenance period in accordance with the criteria set forth in Title 27 for a Class III waste management unit. 47.The waste containment system consists of, from the bottom up: a. Naturally occurring geologic materials prepared and conditioned to prevent the migration of waste constituents to groundwater and to convey leachate to the leachate collection sump. b. A leachate collection and removal system drainage layer consisting of either appropriate selected geologic materials or a geonet/geocushion. c. An operations layer designed to protect the leachate collection and removal system. 48.The leachate collection and removal system will be constructed to convey leachate from Pit G to a sump on the west side of the Unit. The leachate collection pump will detect the level of leachate in the sump and remove leachate to an aboveground storage tank when the leachate reaches a designated level to ensure adequate freeboard is maintained in the sump at all times. The minimum capacity of leachate collection and removal system will meet or exceed twice the maximum anticipated daily volume of leachate. 49.The Discharger demonstrated that site characteristics alone, without a liner, meet the performance goal contained in Section 20310 of Title 27. The demonstration utilized a mathematical model to predict fate and transport of waste constituents discharged to the Units. Results of the model and past performance of the existing Units demonstrate that the proposed Unit design will ensure no impairment of beneficial uses of surface water or groundwater beneath or adjacent to the landfill in accordance with Section 20260(b)(1) of Title 27. 50.The unsaturated zone will be monitored by the construction of a pan lysimeter installed beneath the leachate collection pumps of the leachate collection and removal system. If leachate is produced, it will collect in the leachate collection sumps until a sufficient depth of leachate is attained to operate the collection pumps efficiently. Therefore, the most likely location that leachate could penetrate the surrounding geologic materials is beneath the collection sumps.