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• Final cover will be at least two feet thick and will be constructed of <br />low permeability soil then compacted to minimize percolation of rain <br />into buried waste and resultant leachate formation. The final cover <br />will be tested to assure that the permeability rate is 1 x 10-7 cm/sec <br />or slower (recommended by the EPA, Federal Register, Vol. 44, No. 59, <br />p. 18144). <br />• Revegetation will be with plants having a high rate of transpiration <br />such as the grasses recommended in the soils mitigation section. This <br />is to maintain a high rate of moisture removal from the final cover <br />layer. - <br />• The bottom of each disposal trench will be sloped to one or more points <br />to collect leachate, if any develops. The final design may include <br />underdrains to aid leachate collection, if necessary. <br />• The leachate monitoring program will provide information about the <br />formation of leachate so that remedial action may take place, if <br />necessary. This may include recirculation and/or evaporation in <br />evaporation ponds. <br />• Indigenous soils, if sufficiently impermeable, or artificial liner <br />materials will be used as necessary to construct a barrier between <br />the groundwater system and any leachate which may develop. The bottom <br />liners will be tested to assure that the permeability rate is 1 x <br />cm/sec or slower (recommended by the EPA Federal Resister, Vol" 44, <br />-No. 59, p. 18144). <br />• Groundwater monitoring wells will be located up and down the;ground- <br />water gradient. Periodic sampling and analysis of water from these <br />wells would provide an indication of groundwater contamination if it <br />occurs. if contamination is detected, remedial measures would be <br />employed such as extraction and water treatment. <br />• Watering for dust control shall be avoided on active disposal areas <br />whenever possible to reduce the possibility of leachate formulation. <br />Other Possible Measures <br />• For additional assurance that surface water quality will be protected, <br />water retained in the siltation basin should be monitored for turbidity <br />prior to release into South Paddy Creek. <br />52 <br />