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iv. The Mine Engineer may at his discretion direct that the replacement fill noted in items 1, <br />2, & 3 above will be placed on geotextile or geogrid where deeper subsurface conditions <br />make such action necessary and appropriate. <br />The Mine Engineer or designated representative will prepare and maintain records of all <br />subgrade and embankment Proof Roll tests and of any remedial work undertaken as a result of <br />said Proof Roll tests. The gravel structural section for mine haul roads will be constructed in <br />conformance with the project plans prepared by a professional engineer. Aggregate will be <br />placed in lifts not exceeding twelve (12) inches thick, moisture conditioned as needed to <br />facilitate compaction and will be compacted by wheel rolling using mine haulage equipment. <br />The Mine Engineer will determine the number of passes required for the compaction equipment <br />based upon the type, weight and load of the equipment and upon observation, experience and <br />evaluation of the response of the gravel being placed to repeated passage of the compaction <br />equipment. The Mine Engineer or designated representative will prepare and maintain records of <br />all Proof Roll tests of the aggregate structural section and of any remedial work undertaken as a <br />result of said Proof Roll tests. The Mine Engineer will document the date of completion of the <br />mine haul and access roads and will prepare and retain records of any significant subsequent <br />remedial road maintenance work that may be needed during the life of the mine. <br />Embankment slopes will not be steeper than 2h: Iv, except where embankment material is a <br />minimum 85 percent rock, slopes will not be steeper than 1.35h:Iv. The specified slope gradients <br />will not be exceeded unless it has been demonstrated to the Division that a minimum safety <br />factor of 1.3, or such higher factor as the Division may specify will be achieved. Temporary <br />erosion control measures will be implemented during embankment construction to minimize <br />sedimentation and erosion until permanent control measures can be established. Immediately <br />upon completion, measures will be taken to stabilize all embankments with vegetation cover or <br />other means as approved by the Division to minimize erosion. Topsoil and other material as <br />determined under 4.06.2 will be removed from the design roadbed, shoulders, and surfaces where <br />associated structures will be placed and will be stored in accordance with 4.06.3. <br />Drainage Each haul road will be designed, constructed, and maintained to have adequate <br />drainage, using structures, such as, ditches and culverts. The water control system will be <br />designed to safely pass peak runoff from a 10 -year, 24-hour precipitation event. Drainage <br />structures are required for all flowing stream channel crossings. Drainage structures will not <br />affect the normal flow or gradient of the stream, or adversely affect fish migration and aquatic <br />habitat or related environmental values. Drainage from haul roads that are not constructed within <br />the disturbed area as described in 4.05.2(4) will meet the requirements of 4.03.1(4)(b)(e) to <br />minimize erosion, resultant siltation, and disturbance to the prevailing hydrological balance. <br />Erosion control measures used singly or in combination include but are not limited to: Stabilizing <br />all exposed surface areas to promote a reduction in the rate and volume of runoff; Using straw <br />Section 2.05.3(3) Page 7 April 2016 (PR -01) <br />