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Mr. Michael Cunningham <br />CDRMS <br />June 14, 2013 <br />Please see response to Question 1. We will provide flow rate estimate and sub - surface <br />drain dimensions along with response to Question 1 <br />3. The Applicant has stated the leak detection system will be tested after it has been <br />installed. Please describe the testing process. <br />Response: The leak detection system is not tested during installation. It is a secondary <br />system, to the polypropylene primary system which is installed simultaneously with the <br />GCL. The contractor installing the GCL, leak detection and polypropylene liners will <br />certify that the installation was performed according to the engineer's specification. <br />Testing will only be done on the polypropylene liner as required for certification. <br />4. The Applicant has stated the Division will be notified if a leak is detected in the <br />composite liner. Please commit to notifying the Division in writing within 48 hours of <br />detecting a leak. <br />Response: UMC commits to notifying the Division in writing within 48 hours of detecting <br />a leak. <br />5. The proposed leak detection system appears to cover less surface are of the CGL than <br />the currently approved leak detection system. Will the proposed leak detection system <br />be installed in strips, or will the entire surface of the GCL be covered by the leak <br />detection system? <br />Response: The original design called for the leak detection system to be installed in <br />strips. This design has since been modified. The current plan calls for the entire surface <br />of the GCL to be covered by the leak detection system. <br />6. According to the manufacturer's recommendations the liner material contractor must <br />have prior experience installing GCL's. Please confirm that the liner material contractor <br />has prior experience installing GCL's and briefly describe his experience. <br />Response: UMC has not yet selected a liner installation contractor. However, last <br />summer we sent RFQ's to qualified contractors and have narrowed our selection to two <br />potential installers. Both contractors are Colorado -based companies with experience in <br />liner installation, are supplied directly by CETCO, our GCL manufacturer, and are <br />approved by the manufacturer to install their product. <br />UMC commits to notifying the Division upon selection of our contractor, and providing a <br />resume of their experience prior to commencing with the installation of the liner. It is our <br />understanding that there will be a 30 -45 day lead time for the delivery of the liner and <br />leak detection materials. Upon our ordering of the materials, UMC will notify the Division <br />of our contractor selection, thus allowing maximum time for the Division to review the <br />contractor's credentials. <br />7. The manufacturer calls for placing a cover layer at a minimum depth of 1 ft over the GCL <br />to eliminate the potential of seam separation. The Applicant has stated water will be <br />added to the TSF to act as a weight until such time as the mill becomes operational. <br />