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~J Mr. Gilbert F. Rindahl -4- November 4, 1983 6. The fact that 6" of topsoil is to be placed directly over clay on t the pit floor may cause problems with revegetating this site. Typically, Y µ clay is not a good plant growth medium, and 6" of rooting depth and water V holding capacity will probably not be sufficient for plant growth. I K K~ therefore recommend that the operator leave at least 6" of product below r,~:. the topsoil (and above the clay) to help to provide adequate plant growth ~o K° medium. 1. An examination of your proposed revegetation mixture (minus the rye nurse crop) leads me to several question areas. J a. Are the seeding rates given to be in pounds? b. Is the seeding to be done by drilling or by broadcasting? If J the seed is broadcast, it should also be raked in to assure that it is properly covered. c. The total seeding rate, if drilled, is nearly four times as ,r,~ high as the recommended critical area rate of 40 seeds/s q. ft. and ~ nearly twice as high, if broadcast. In fact, my calculations, ~ ~~ given your seeding rates, give a total of 145 seeds/s q, ft. Such a ,, rate will almost assuredly result in negative effects on some 1,' ~,~°~ species due to competition. The balance among the species may b(~° accelerate such competition effects. By my calculations, the percentages of your mixture for each species (on a seeds/s q. ft. basis) are as follows: Species Seeds/sq. ft. Percent of Mixture Western Wheatgrass 32 22 Sideoats Grama 16 11 Needle-and-Thread 5 3 Little Bluestem 21 14 Prairie Sandreed 22 15 Blue Grama 49 34 Total 145 Please reconsider the seeding rates of each species to give a more practical total rate and a better species balance, or explain thoroughly your reasons for proposing this mixture. The species composition of the mixture seems appropriate, however. 8. How will the reclamation plan affect the ponds and the drainage way V to the east of the operation? Exhibit f 1. Given the fact that a pond, a well, and water usage issues are outlined in this application, I have given a copy of this application to the Division of Water Resources for their review. As soon as I receive this review, I will forward a copy to you.