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RULE 4 PERFORMANCE STANDARDS <br />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 />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 />The groundwater piezometer well will be established in the West Taylor valley fill (please see Map <br />1013) 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. To view the specific area covered under the requested variance from <br />contemporaneous reclamation, please refer to Map 29A. <br />South Taylor/Lower Wilson — Rule 4, Page 9 Revision Date: 4/7/17 <br />Revision No.: RN -07 <br />