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4f �U (2) The mobility and the expected rate of migration of the hazardous waste and hazardous waste constituents; (3) Site location, topography, and surrounding land use, with respect to the potential effects of pollutant migration (e.g,, proximity to ground water, surface water, and drinking water sources); (4) Climate, including amount, frequency, and pH of pre- cipitation; (5) Characteristics of the cover including material, final surface contours, thickness, porosity and permeability, slope, length of run of slope, and type of vegetation on the cover; and (6) Geological and soil profiles and surface and subsurface hydrology of the site. (d) During the post -closure care period, the owner or operator shall: (1) Maintain the function and integrity of the final cover as specified in the approved closure plan; (2) Maintain and monitor any leachate collection, removal, and treatment system to prevent excess accumulation of leachate in the system; (3) Maintain and monitor any gas collection and control system to control the vertical and horizontal escape of gases; (4) Protect and maintain surveyed benchmarks; and (5) Restrict access to the landfill as appropriate for its post -closure use. 4. Liquid waste. (a) Bulk or non -containerized liquid waste or waste containing free liquids shall not be placed in the landfill, unless: (1) The landfill liner is chemically and physically resistant to the added liquid, and the leachate collection and removal system functions and has a capacity sufficient to remove all leachate produced; or (2) Before disposal, the liquid waste or waste containing free liquids is treated or stabilized, chemically or physically (e.g., by mixing with an absorbent solid), so that free liquids are no longer present.