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2.05.3 <br />Temporary erosion control measures will be implemented during the <br />construction of the haul roads. Straw bales or other alternative <br />sedimentation control devices will be placed along the edge of the <br />embankments. After construction is complete the area disturbed will be <br />seeded and mulched to reduce the rate and volume of run-off. <br />A typical haul road section is shown on Map HR -1, Haul Road Sections, <br />presented in Volume V. Maps 52-1-011 through 52-1-014, presented in <br />Volume V, show plan and profile views of this haul road segment. <br />Drainage <br />The drainage design for the haul road includes ditches, ditch relief drains and <br />culverts as shown on the Drainage Plans, Maps 21-1 and 21-2. Volume III, <br />Exhibit 8, Protection of the Hydrologic Balance, presents the run-off <br />calculations based on the 10 -year, 24-hour precipitation event. The ditch <br />and culvert sizes are presented in Exhibit 8 and on Maps 22-B, 22-C, 22-J <br />and 22-K. <br />Culverts are designed in accordance with the Handbook of Steel Drainage & <br />Highway Construction Products (1983). According to table HC -1, page 126, <br />the minimum depth of cover for corrugated steel pipe, H-20 live load, 2 2/3 X <br />1/2 inch corrugations is 12 -inches for diameters or spans of 12 to 96 inches. <br />The depth of cover is measured from the top of pipe to the top of subgrade. <br />Therefore all culverts will be covered by compacted fill to a minimum depth of <br />1 foot. <br />The inlet end of culverts as necessary will be protected by an end section, a <br />rock, concrete or metal headwall also known as a wing wall. <br />2) Haul Road along old railroad bed. <br />General Requirements <br />This road has two segments. One is approximately 3,000 feet long and <br />provides access to Gob Pile #1. The second segment turns off of segment <br />one at station 123+00 and is approximately 300 -feet long to provide access <br />to Gob Pile No. 2. Reference Map 16, Haul Road Plan & Profile - Gob Pile. <br />These roads provide access to the gob piles and sediment ponds C, D and <br />F. Drainage from the majority of the road is not contained in any sediment <br />ponds. A portion of this road was re -constructed with the preparation plant <br />MR -158 2.05-28- 08/14 <br />