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Adequacy Rev.icw (GIiC) -2- Ilcccmher 12, 1~RQ 715.14(4) Small llcpressions; ilcpressions in the fill materials shall not he constructed ~n that the infiltration of water into the fill. is minimized. 715.14(1) Stabilizing +lilles and f,ullies: The operator must commit to the stabilization of all crosinn features, such as rills and gullies, should they develop to a depth of nine (9) inches or more. 715.14 (j) Acid-forming and/or 'toxic-forming Materials; Such materials shall not be hurried in proximity to a clr;rinal!e course such that a threat or danl!.er of water pollution mipht develop. It must he demonstrated that the use of the fill materials proposed as opCion (h) will not adversely affect water cluali.ty, water flow, vegetation, and will not cause instability in the hackfilled area. 715.16 Topsoil; "+y calculations indicate th;rt removing 6 inches of topsoil from an area 1511' x 500' and distributing it over :i.R acres would provide an average of 2.72 inches topsoil replacement depth. A?1.Rn cannot approve the idea of disturhin~ additional acreaJ;e to acquire topsoil: in- creasing; the disturbed. area, which would require revegeta- tion,, by 45e cannot he justified by the acquisition of less than :i inches of topsoil for t.lie existing disturbance. An alternative source of lil<+nt 1!rowth medium must be proviclecl. Although a 50 Coot (minimum) clay lined channel will he installed, all hrrt the central 1'1 feet must be tonsoilecl; the reclui.recl volume of topsoil will, therefore, be closer to 2000 LCY than 1000 LCY. 715.17(x) Sediment Control flan; No such plan was submitted. 715.17(h) Scrrf;cce 1V;rt,cr ^+onitoring; A l~l:rn for monitoring surface water quality must be submitted. 715.17(4) Stream Channel piversion: 'I'lic ^JCwlin Creek is mapped as a perennial stream and was diverted prior to GeC succession as operator. Anew di.vcrsion was established in the spring of 19RO under emergency CO17(1rt10nS with verbal permission from MI.R11. As presently C("IISLTUCtCd, the diversion channel is unstable and is contributing additional suspended sediment to the streamflow. 'I'bis plan cannot he approved unCil channel design, mainC;uience, ;ur4 stability arc addressed. Erosion control structures, such as channel lining, retention basins, and ;rrtificial channel roughness structures, could he used in addition to establishing a flat bottomed channel. The ch;rnnel, h;urk and flood , plain configurations must he des.ignecl to safely pass the 1. (1 year/24 hour precipitation event (this applies to both the diversion channel and the reconstructed channel). 'I'hc restoration of fish and/or wilcilifc habitat must be addressed. ~ ~ -- __. _ __ .._. _ -..._~.~._,. ...._., . - --.r ~ .