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- keyways have been constructed in accordance <br /> with sound engineering practices; <br /> - placing and spreading of fill material has <br /> been started at the lowest point of the foundation <br /> and brought up in 12" horizontal layers . Each <br /> layer has been compacted per engineering consultants <br /> recommendations to achieve maximum compaction; , <br /> - moisture content of the fill material has been <br /> optimized to improve compaction. <br /> The principle spillways are constructed of cor- <br /> rugated metal pipe in conformance with Federal specifications W. <br /> W-P-402 . The pipe has been imbedded firmly and uniformly through- <br /> out the impounding structure. <br /> c ., Permanent impoundments design criteria <br /> Mid-Continent has not nor will not be constructing <br /> permanent sedimentation control impoundments, therefore this <br /> section is not applicable. <br /> d . Diversion design criteria <br /> Mid-Continent has designed, constructed and main- <br /> tained a large number of diversion ditches to control surface <br /> runoff and to minimize water quality degradation. Ditches have <br /> been located to divert water away from disturbed areas or to <br /> convey water flowing out of disturbed areas to treatment facilities . <br /> The diversion ditches have been designed in accordance with CMLRB <br /> regulations to minimize erosion. <br /> Temporary diversion ditches,- such as at the base <br /> of the old coal refuse disposal area, have been designed to <br />