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Rule 2: Permits <br />• Light Use Roads <br />Light use roads are constructed to provide infrequent access to multiple locations on the property. At <br />Lorencito Canyon, light use roads range from pre-mine ranch roads to roads constructed for the <br />establishment and maintenance of sediment ponds, exploration drill pads and other auxiliary <br />facilities. Light use roads required for construction and maintenance of Ponds 007a, 009, and 009a <br />are delineated on Figure 2.05.3-14a. All existing roads will be maintained in their existing condition, <br />and where needed, new light roads will be constructed as summarized below. <br />Alignments follow existing roads, ridge lines, or the most stable available slopes when possible. <br />Except for crossings, no segments of light use roads are located in the channel of an ephemeral, <br />intermittent, or perennial stream. The light use low water crossing of the Purgatoire River <br />immediately east of the access bridge will only be used for those occasions when loads exceed the <br />load limit of the bridge. Generally, it will only be used for fuel trucks and when transporting heavy <br />mine equipment onto or off of the site. These occurrences should average less than one per day. <br />Intermittent or perennial natural drainages will not be altered or relocated. No unique, endangered, or <br />special environmental or cultural resources are known to be impacted by the road system. <br />Light use road design is appropriate for the speci5c uses of the road. Grades exceeding 20 percent <br />shall not be longer than 300 feet within any consecutive 100'; grades steeper than 20 percent will not <br />be longer than 1000 feet. The overall grade will be less than ten percent. <br />Light use roads will range in width from 10 to 16 feet. The travel way is insloped (5%), ditched <br />• adjacent to cuts, and has culverts or swales when necessary to prevent ponding. Typical cross section <br />are shown in Figure 2.05.3-14. <br />Vegetation will be cleared for no more than the width needed for the roadway, drainage control, and <br />any cut and fill. Topsoil will be removed from road cut and embankment footprints and stored for use <br />in reclamation and as a vegetation growth medium for cut and till slopes as required by the Division. <br />Side-cast construction may be used on cut slopes. Embankment materials will be free of organic <br />matter, peat, or other unsuitable (acid-producing) materials. Embankments shall be compacted only <br />as necessary to control erosion and maintain the road. <br />Drainage ditches will be placed at the toe of al] cut slopes to intercept flows. Ditches are sized to <br />minimally accommodate design flows from a 10-year 24-hour even with 0.3 feet of freeboard. Ditch <br />relief cross-culverts (to transfer ditch flows across the roadway) or swales remove storm runoff from <br />the roadway. <br />Culverts will be established in all perennial and intermittent, and ephemeral channels draining <br />watersheds greater than one square mile. Culverts or swales, placed at natural grades, are used to <br />cross drainages of ephemeral watersheds less than one square mile. Culverts will be sized to <br />accommodate design flows without a head over the conduit. However, the minimum diameter will be <br />18 inches to minimize plugging and accommodate maintenance. All culverts have mitered <br />i• <br />Page 2.05-29 Rule 2 Permits (Feb.20.03).doc 2.05-29 (Revised 02/19/03) <br />