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4.8.1 Buttress and Underdrain Construction Inspection <br />The RPE East refuse pile construction will be inspected at least quarterly by a by a registered <br />engineer or other qualified professional specialist experienced in construction of earth and rockfill <br />embankments under the direction of a qualified professional engineer. Construction inspection <br />activities will include observation to confirm the following activities are performed in accordance <br />with the approved permit design and specifications: <br />(1) Removal of all organic material and topsoil <br />(2) Placement of underdrainage systems <br />(3) Installation of surface drainage systems <br />(4) Placement and compaction of fill materials, and <br />(5) Revegetation <br />A report signed by an engineer licensed in the state of Colorado will be submitted to the CDRMS <br />within 2 weeks after each inspection. The report will state whether the fill has been constructed as <br />specified in the approved design. The report will also include a description of any appearances of <br />instability, structural weakness, or other hazardous conditions observed during the inspection. MCC <br />will retain a copy of the report at the West Elk Mine offices. <br />Reports addressing the underdrain system and protective filters will include color photographs taken <br />during and after construction, but before underdrains are covered with excess spoil. Since <br />construction of a new phase of underdrain system will likely occur every one to two years, each <br />construction phase will be certified separately. The color photographs accompanying each certified <br />report will be taken in adequate size and number with enough terrain or other physical features of the <br />site shown to provide a relative scale to the photographs and to specifically and clearly identify the <br />site. <br />4.8.2 Routine Quarterly Refuse Pile Inspections <br />The refuse pile will be inspected quarterly by a by a qualified registered engineer, or other qualified <br />professional specialist under the direction of the professional engineer, experienced in construction <br />Revised July 21, 2011 P4s <br />P \Mpls \06 CO \26 \06261003 RPE E Permit Mod Support\WorkFiles \Permit Apphcation \Text \Exhibit 82 RPEE design 2011 -07 -21 TR 127.doc 25 <br />