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RULE 4 PERFORMANCE STANDARDS <br /> 34,,tY o"4.n4N,t ">:w,.:tr,t`,1,0.;44 4,1,,;,..,;. a-,.'.:,",...:,.. >, t R1.,V.. . ':,S,IV•Yb "%**$4.$4,k,, <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 each required <br /> inspection. 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 quarterly. Monitoring will continue until such time that Division allows relinquish of quarterly <br /> monitoring. <br /> 1. The groundwater piezometer well will be established in the West Taylor valley fill (please see Map <br /> 10B) and will be monitored quarterly for water level and the other parameters consistent with the <br /> present Colowyo groundwater monitor plan. <br /> 2. 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: 12/20/19 <br /> Revision No.: TR-135 <br />