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Section 816.115 (a) Continued. <br />nation of seeds, or increase the moisture-retention capacity of the soil. <br />The regulatory authority may, on a case-by-case basis, suspend the <br />requirement for mulch, if the permittee can demonstrate that alternative <br />procedures will achieve the requirements of 816.116 and do not cause or <br />contribute to air or water pollution. <br />As previously approved, CYCC will not apply cereal grain mulch to <br />retopsoiled areas. Regraded spoil is stabilized in two different <br />ways. The physical properties of the spoil itself tend to stabilize <br />the surface upon regrading. Secondly, the application of topsoil <br />serves as a stabilizing mulch. <br />Unlike overburden that quickly fraements into soil size fractions, the <br />material within the permit area remains in relatively coarse fragments <br />for several years. The effect of these coarse fragments is a decrease <br />in bulk density. The rough surfaces of the fragments catch and retard <br />• water runoff. Surface spoil pores remain open longer than is the case <br />with finer materials which tend to become puddled and swell shut. This <br />phenomenon was documented by two hydrologists, Farmer and Richardson <br />(1976), with respect to spoil piles in P;ontana. They reported that <br />spoil ridges should be graded to their final configuration as soon as <br />feasibie because such regrading not only "increases the infiltration <br />rate, but also decreases the soil erosion potential". <br />Kay (197E), in a comprehensive review of mulchinc, reported that a <br />stone mulch 1 inch deep provided more effect erosion control than ~9S2 <br />lbs/acre of straw. Greater rates of stone Y~ere reported to be even <br />more effective. <br />The results cf 96 samples cf spoil sized in connection with overburden <br />leaching studies revealed an average rock size (fragments larger <br />• - <br />816-149 Revised 64/22/87 <br />