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i - ~ ~ ENVZP,ONMENTAL I:~fPACT STATE~1EtdT TO ACCO`PAh"Y APPLICATIONS FOR SPECL4L USE PER,`IIT - MINERAL IdASTE DISPOSAL DUMP, MIT7E 3C, LOG AN WASH OIL SHALE OPERATION. LOCATTON AND SCOPE ~ Application is made for a Special Use Permit for a mineral disposal site located in the E1/2 Ir'W1/4 Section 25 T75 - P.97IJ, a side re entrant off the north side of Logan Wash (Figure 1). The site will contain approximately 500 thousand cubic yards of raga oil shale. (See cross sections A-G and Figure 2). Application was previously made for a Conditional Use Permit for construction of a road and mine designated the "3C adit", in this same parcel. The present applicatinn covers the mine dump that will originate from these operations. The material to be dumped will be rata oil shale rock with chemical and physical characteristics virtually identical to those of oil shale talus slopes that now exist beneath the mahogany ledge in the same area. Purpose of the dump, other than servicing mining operations in this parcel will be an experimental site for re- vegetation, compacting, and slope stability experiments. DESIGN AND CONSTRUCTION The disposal pile at Garrett's 3A Adit, the present operation, was constructed by end dumping plus a small amount of compaction. The dump has proven to be exceptionally stable. Configuration of - the canyon suggests that similar methods be used at the 3C adit. No problem is anticipated in maintaining slope and stability of the pile if care is paid to compaction and trirening. WATER Construction of the dump will not have an adverse effect upon underground :cater. Surface water may be somewhat affected. This is covered under the site rehabilitation section of this appLi- cation. The material being dumped is raw oil shale and should not affect either the salinity or the chemical balance of the ~:ater.