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<br />DATE: December l2, 1997 <br /> <br />TO: Lloyd V. "Buck" Barnhart ~/~D <br />FROM: Lany D. Oehler, Environmental Protection Specialist <br />RE: File No. M-97-087, IBCO, Hartman Pit, Adequacy Items <br />The following items must be addressed by the applicant in order to satisfy the applicable requirements <br />of C.R.S. 34-32.5-L01 et seg and the Construction Materials Rules and Regulations of the Mined Land <br />Reclamation Boazd: <br />Exhibit D - Minine Plan <br />ak <br />QcS~~~ <br />~ ~ The Division is concerned that if the top 4" - 8" of topsoil is to be salvaged and used as topsoil <br />l <br />h <br />~ es t <br />in reclamation and this fraction of the soil profile is 60% cobb <br />at upon replacement the <br /> cobbles will remain on the surface and the organic soil will essentially be buried. The Division <br /> recommends that the topsoil be screened of rock lazger than 2 inches, separately from other <br /> screening operations. The remaining topsoil and small rock should then be mixed with an equal <br /> amount of fines before being spread as topsoil. This soil material should then be further <br /> amended with 20 tons/acre of manure. If the cobbles were to remain in the topsoil, it would <br /> probably not be possible to drill seed the reclamation mix and the mix would have to be <br /> doubled to broadcast seed it. Either commit to this change of the reclamation plan (no <br />`` Technical Revision) or provide your own plan to solve the above problems. <br /> <br />~~ y 2. <br />~~7~ <br />Incorporate into the Mining Plan and on the Mining Plan Map the requirements of the CIG <br />i <br />f <br />h <br />i <br />d <br />bli <br />h <br />li <br /> t <br />ther side o <br />e p <br />pe <br />ne an <br />esta <br />s <br />ing 4:1 <br />agreement such as remaining 50 feet away from e <br /> slopes from that point to the pit floor. <br />xhibit E -Reclamation Plan <br />f'~ ~ <br />F+Ot" 1. The Division recommends that the berm azound the edge of the reclaimed area be taken out of <br />n ~ <br />C 1 the plan. Such a berm would not be constructed on the level (contour) and would act as a <br /> diversion overland flow. The diverted water would no doubt break the berm in low areas <br /> concentrating flows and causing erosion of the hill slopes below the pit and in some instances <br /> possible off site damage. Such berms unless build on the contour or to a grade not exceeding 2 <br />~~ or 3°!o and spilling to a constructed catchment basin or protected waterway could do more harm <br />ld b <br />i <br />l <br />f <br />b <br />h <br />d <br />i <br />L e a <br />ve cover wou <br />etter eros <br />on contro <br />met <br />a good vegetat <br />. <br />than good. Establishment o <br />o <br /> <br />~'~ ` ` <br />~ You stated that if topsoil or growth media is to remain in stockpiles For more than one growing <br />season an SCS (NRCS) recommended vegetative cover shall be employed... Only a final <br />~ revegetation seed mix was found in your plan, this mix is not very suitable for establishing a <br /> quick vegetative cover. These grasses take too long to establish. The Division recommends <br /> that you commit to using the following mix or a similar mix. These are large seeded cool <br /> season grasses that establish more readily when moisture is more likely to be available in the <br /> area. <br />d'! - <br />