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check dams. C. Evaluation of Compliance of Proposed Plan Water Quality Standards and Effluent Limitations n 1` The applicant is routing all surface drainage from the Refuse Disposal and D- Portal Areas through sediment ponds (See "Sedimentation Ponds" section in this ~y TEA). These two areas represent the majority of surface disturbance at the 6 Deserado Mine. There are three areas however, which appear to be lacking suf- ~ ficient run-off control, and for which the applicant has requested an exemption ~~ a from constructing sediment ponds. These areas include: the Ventilation Entry 3~y Area, the Water Storage Tank Area and the Explosive Storage Area. The Ventila- b tion Entry Area is located adjacent to the abandoned Staley-Gordon Mine near the confluence of Scullion Gulch and the White River.. Approximately 2.2 acres will be disturbed by the entry area and access road. The Water Storage Tank Area is located on a drainage divide irtonediately north of the D-Portal Area. The storage area and access road constitute approximately 8 acres of the total Scullion Gulch watershed. The Explosive Storage Area is immediately adjacent to the southeast corner of the D-Portal area, but run-off from the storage area will not be directed into the D-Portal sediment pond. The site consists of two small buildings and an access rodd, constituting a disturbance of approximately 1 acre. All of these sites comprise very small upstream drainage areas and di- sturbed acreage is relatively insignificant to the overall Scullion Gulch -ti} watershed. The applicant has proposed some erosion control for each site, such -~i` as gravel surfacin diversion ditches, collector ditches, riprap, revegetation ~~' and rock check dams (page IV-70). It is therefore recommended that the appli- cant be granted a small area exemption for the Water Storage Area and the Ex- plosive Storage Area providing that the proposed erosion controls be implement- ed prior to the onset of construction at these sites and that location of all rock check dams to be installed for sediment control be illustrated on the J Water Storage Area Maps 52-55 and on a map illustrating the Explosive Storage Area. The Ventilation Entry Area is one of the two access sites to the underground mine, but will be used only for ventilation purposes as an emergency exit (p. 12