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• Larry Oehler - 9 - Permanent Ponds Reclamation Resources has proposed the creation of two pe during the reclamation phase. The dimension of each pond approximately 1000 X 350 X 15 feet deep with gentle side Division requests that the side slopes be no greater than slopes of 10:1 or 5:1 are preferred. The 1000 X 350 feet acres of surface area. The ponds shown on exhibit F are 8.0 and 11.0 acres. Please clarify the intended size of Also, please discuss the location of the permanent ponds, for locating the pond on the uphill portion of the distur Reclamation Resources is advised to consult with the State Office regarding the need fora well permit or substitute evaporative losses from the two ponds. '~ O Topsoil Application April 4. 1990 anent ponds ill be op es. The :1 . Side quals 8.03 proximately larger pond. .e., reasons i area. n g i neer' s~-,~a~w.wf,~.-,,. pply~ plan for The proposed reclamation plan includes the placement of 4 12 inches of topsoil on a gently sloping southwest facing landform and a creation of forest and grassland communities. Exhibit F - Reclamation tan Map depicts 6 "islands" ranging in size from 0.46 to 5.16 acres of forest community. The average island size is 2.8 acres. Since the supply of topsoil at the Alma Placer is limited, he Division G~ur"} encourages the applicant to use this resource wisely during reclamation. The Division recognizes that plant rooting zones for grassl nd ~y,~,r 7 communities, typically average 6 to 12 inches and plant roo ing zones for shrub and woodland communities typically average greater th n 18 inches. The woody shrub and forest species often have deep root sys ems, and therefore require a deeper rooting zone. In consideration of these facts, the D of topsoil for the grassland community remaining topsoil should be applied to of 12-18 inches where feasible. These result in greater revegetation success 4. Native Seeding and Seedling Mix ivision recommends th t application average 6 to 8 inche The the forested communi ies at depths topsoil depths shout ultimately at the Alma Placer. I The seed rate proposed for the forest community is 6 lbs/A LS. The seed rate proposed for the grassland community is 28.2 lbs./A PL Since the forest and grassland communities will be established in the same area, the potential for sheet and rill erosion would appear to be equal for these communities. The seed rate for each community should be based on the recommend seeding rate defined by the SCS for "Critical Area Planting." In Colorado, these rates are 40 pure live seeds per square foot for non-irrigated areas and 50 pure live seeds per squ re foot for irrigated areas. IVrthecettrs~y ~st~y ~ t Cc~Y G~.~t~ Reclamation Resources should indicate if it igation water w 11 be applied to the forest community. The seed rate for Arizona Fescue nd Mountain Muhly in the forest community should be within 90 percent of the critical area planting rate to minimize soil erosion between seedlings.