Laserfiche WebLink
Interoffice Memorandum <br />To: Rob Zuber <br />From: Zach Trujillo <br />Subject: Colowyo — Fourth Quarter 2013 West Pit Fill Monitoring Report <br />Date: 1/30/2014 <br />••• <br />After my review of the Fourth Quarter West Pit Fill Monitoring Report for the year 2013, 1 find the report in compliance <br />with the following rules: <br />1. 4.09.1(11)(a) —The fill was inspected for stability by a registered engineer during the placement and compaction <br />of fill materials. <br />2. 4.09.1(11)(b) —The qualified registered engineer provided to the Division a certified report within two weeks <br />after the inspection that the fill is being constructed as specified in the design approved by the Division. The <br />South Taylor Fill was inspected on September 17, 2013 and the Quarterly Fill Monitoring Report was received by <br />the Division on October 7, 2013. No appearances of instability, structural weakness, and other hazardous <br />conditions were noted in the inspection report. <br />3. 4.09.1(11)(c) — Rule 4.09(11)(c) is no longer applicable during this stage of fill construction. <br />In my review of the 2013 Third Quarter West Pit Fill Monitoring Report I noted that there was a change in elevation <br />decrease of 0.202 feet when compared to the June 19, 2013 data. The third quarter report stated that due to personnel <br />and equipment changes between the second and third quarter inspections, they concluded it to be human error in the <br />second quarter measurements. Within the 2013 Fourth Quarter West Pit Fill Monitoring Report, Colowyo's confirms <br />their opinion on human error being the cause of the large deviation measured in the 2013 Third Quarter West Pit Fill <br />Monitoring Report. <br />The largest displacement surveyed was 0.053' at the West monument which could likely be from survey variation. <br />Colowyo states total displacements of the monuments are not of concern in which I agree. The 2013 Fourth Quarter <br />West Pit Fill Monitoring Report for Colowyo Mine meets all rules required by the Division. If you have any questions, feel <br />free to contact me. <br />Sincerely, <br />Zach <br />