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_ 3.7.4.2 Drainage <br />• <br />Culverts are provided for road crossings of flowing drainages or streams. Given <br />the location of the proposed permit area, very few culverts are required since <br />most light-use crossings occur at the head of [he drainages, and the roads are <br />used principally during [he dry weather months. However, culverts are used when <br />required and are designed [o pass safely a ten-year, 24-hour precipitation event. <br />Ephemeral streams with a drainage of more than one square mile will no[ be forded <br />during flow periods. Natural drainages are no[ altered and any crossings will <br />not alter the normal flow or gradient of the drainage. <br />3.7.4.3 Surfacin¢ and Maintenance <br />Generally, light-use roads are used only during [he dry weather months or in the <br />winter when the surface is Erozen. When surfacing is required, however, it will <br />comply with the discussion in Section 3.7.2.4. <br />Roads are maintained as required to ensure their integrity and to minimize ero- <br />• <br />sion. Since the roads are principally used for pickup truck travel during dry <br />weather months or when frozen, very Little maintenance is required. <br />.7.4.4 Restoration <br />When no longer required, restoration of those light-use Goads constructed by <br />Trapper Mining Inc. will be accomplished according [o Section 3.7.2.6. Those <br />light-use roads which existed prior to mining operations will either be left iYlas <br />good or better condition than they were originally or removed and the area <br />restored according to Section 3.7.2.6. <br />3-177 <br />I <br />RSV}SED ~`CP 1 '~? <br />