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Excavate the soft area to the depth designated by the Mine Engineer, moisture <br />condition (wet or dry as required) the material removed, replace and recompact the <br />same material in lifts as directed by the Mine Engineer. Repeat the Proof Roll test, or <br />2. Excavate the soft area to the depth designated by the Mine Engineer, dispose of the <br />material excavated and replace it with select imported fill placed in lifts and <br />compacted as directed by the Mine Engineer. Repeat the Proof Roll test, or <br />3. Excavate the soft area to the depth designated by the Mine Engineer, dispose of the <br />material excavated and replace it with imported Pit Run Gravel placed in lifts and <br />compacted as directed by the Mine Engineer. Repeat the Proof Roll test. <br />4. The Mine Engineer may at his discretion direct that the replacement fill noted in <br />items 1, 2, & 3 above shall be placed on geotextile or geogrid where deeper <br />subsurface conditions make such action necessary and appropriate. <br />The Mine Engineer or designated representative shall 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. <br />The gravel structural section for mine access and haul roads shall be constructed in conformance <br />with the project plans prepared by a professional engineer. Aggregate shall be placed in lifts not <br />exceeding twelve (12 ") thick, moisture conditioned as needed to facilitate compaction and shall <br />be compacted by wheel rolling using mine haulage equipment. The Mine Engineer shall <br />determine the number of passes required for the compaction equipment based upon the type, <br />weight and load of the equipment and upon observation, experience and evaluation of the <br />response of the gravel being placed to repeated passage of the compaction equipment. <br />The Mine Engineer or designated representative shall prepare and maintain records of all Proof <br />Roll tests of the aggregate structural section and of any remedial work undertaken as a result of <br />said Proof Roll tests. The Mine Engineer shall document the date of completion of the mine haul <br />and access roads and shall prepare and retain records of any significant subsequent remedial road <br />maintenance work that may be needed during the life of the mine. <br />Temporary erosion control measures (ditches, berms, straw dikes, silt fence) will be utilized <br />during embankment construction to minimize sedimentation and erosion until permanent control <br />measures can be established. Immediately upon completion, measures will be taken to stabilize <br />all embankments with vegetation cover or other means as approved by the regulatory authority to <br />minimize erosion. Where a vegetation cover is used, consideration shall be given to providing an <br />appropriate growth medium. <br />Drainage Each haul road not within areas disturbed by mining and reclamation activities will be <br />designed, constructed and maintained to have adequate drainage using ditches and culverts to <br />safely convey the peak runoff from a 10 -year, 24 -hour precipitation event while maintaining a <br />minimum of one half foot of freeboard to the top of the road embankment (see Map 2.05.3(3) -3 <br />for typical details of drainage structures). <br />Section 2.05.3(3) Page 6 October 2013 (TR -05) <br />E: \New Horizon \DRMS \NHN Permit \04_Technical Revisions TR \TR -05 \Documents from Jason \2.05.3(3) Mine Facilities TR- 05.docx <br />