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providing an appropriate growth medium. <br />Topsoil. Topsoil and other materiel as determined under 4.06.2 will be removed from the <br />design roadbed, shoulders, and surfaces where associated structures will be placed, and <br />will be stored in accordance with 4.06.3 <br />Drainage. Each haul road will be designed, constructed, or reconstructed, end maintained <br />to have adequate drainage, using structures, such as, but not limited to, ditches, cross <br />drains, ditch relief drains, culverts and bridges. The were r-control system will be <br />designed to safely pass peak runoff from a 10-year, 24-hour precipitation event or a <br />greater event if required by the Division. <br />Natural drainage. Natural channel drainageways will not be altered or relocated for haul <br />road construction or reconstruction without the prior approval of the Division in <br />accordance with 4.05.3 and 4.05.4. The Division may approve alterations end relocation <br />only if the natural-channel drainage is not blocked, no significant damage occurs to the <br />hydrological balance, and there is no adverse impact on adjoining landowners. <br /> <br /> Stream Crossings. Drainage structures are required for ell flowing stream channel <br /> Crossings. Drainage structure will not affect the normal floe or gradient of the stream, <br />or adversely affect fish migration and aquatic habitat or related environmental values. <br />Haul Roads Within the Disturbed Aree. Drainage from haul roads constructed within the <br />disturbed area as described in 4.05.2(4), will meet the requirements of 4.05.2 end such <br />haul roads will at a minimum be designed, constructed, reconstructed and maintained <br />using the best technology currently available to minimize erosion as required by <br />4.03.1(4)(6). <br />Naul Roads Not Within [he Disturbed Area. Drainage from haul roads that are no[ <br />constructed within the disturbed area as described in 4.05.2(4), will meet the <br />requirements of 4.03.1(4 )(b)-(e) to minimize erosion, resultant siltation, and disturbance <br />to the prevailing hydrological balance. <br />Measures to Control Erosion of the Disturbed Aree. Erosion control measure used singly or <br />in combination include but are not limited to stabilizing ell exposed surface areas [o <br />promote a reduction in the rate end volume of runoff, using straw dikes, riprap, check <br />5 <br />