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RULE 4 PERFORMANCE STANDARDS <br />1.Inspections will be conducted at least quarterly during the construction period and during the <br />following specific construction periods. <br />a.removal of topsoil and organic material <br />b.placement of underdrain system <br />c,installation of surface drain system <br />d.placement of fill material to insure that the largest rocks are reaching the bottom of the dump <br />face and that the formation of voids that adversely affect mass stability are prevented and <br />e.revegetation <br />The purpose of the inspections is two fold. First, these inspections will document and certify that the <br />construction plan is being followed. Secondly, during the above phases of the construction, a key emphasis of <br />all inspections will be to implement routine contingencies as situations warrant. For example, perhaps a <br />section of underdrain should be reworked, or the spoil dump raised to provide optimum gravity spoil sorting. <br />Inspections and implementation of contingencies during these critical phases of fill construction will be a <br />routine but very important component of fill inspections. <br />2.Each certified inspection report will be provided to the Division within two weeks after then end of <br />each quarter. Each report will certify that the fill has been constructed as specified in the minimum <br />design approved by the Division. The reports will include a description of any appearances of <br />instability, structural weakness and other hazardous conditions observed during the inspection. <br />3.Certified reports addressing the underdrain system will include color photographs taken during and <br />after construction,but before the underdrain is covered with spoil. <br />After construction, the South Taylor fills will be monitored quarterly for the following items and reports will <br />be submitted within two weeks after the end of each quarter. Monitoring will continue until such time that <br />Division allows relinquish of quarterly monitoring. <br />1.On a quarterly basis, a certified report by a registered engineer will be completed taking into <br />consideration any changes and will note any evidence of surficial slope failure or the formation of <br />springs or seeps on the face of the fill. <br />4.10—4.12 DISPOSAL OF EXCESS SPOIL <br />These sections are addressed in Volume 1. <br />4.13 CONTEMPORANEOUS RECLAMATION <br />All reclamation efforts, including backfilling, grading,topsoil replacement and revegetation, of land disturbed <br />by the mining activities in the South Taylor pit shall occur as contemporaneously as practicable with mining <br />operations. Colowyo has formally requested a variance for a delay in contemporaneous reclamation in the <br />South Taylor mining area due to the unachievable requirements listed in Rule 4.14.1(1)(d), which the <br />Division has approved. <br />South Taylor/Lower Wilson—Rule 4,Page 9 Revision Date: 4/14/22 <br />Revision No.: RN-08