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t <br />J &T Consulting, Inc. <br />August 25, 2014 <br />Mr. Peter Hays <br />Environmental Protection Specialist <br />State of Colorado <br />Division of Reclamation, Mining, & Safety <br />1313 Sherman Street — Room 215 <br />Denver, CO 80203 <br />RE. Northern Colorado Constructors, Inc. — NCCI Pit #1 — Technical Revision No. 8 Request <br />File No. M- 2001 -107 <br />Dear Mr. Hays, <br />Northern Colorado Constructors, Inc. (NCC) requests a revision to their existing permit to address the <br />following item: <br />1. Exhibit L — Reclamation Costs <br />a. Revision of the financial warranty required for the reclamation of each phase of mining. <br />A detailed description of this revision is in the following section. <br />Exhibit L - Reclamation Costs <br />NCC requests a reduction of the required financial warranty for the clay liner to 20% of the cost to <br />install the liner under the regulated construction option detailed in the "Guide to Specification <br />Preparation for Slurry Walls and Clay Liners as a Component of a Colorado Mined Land <br />Reclamation Permit ". <br />NCC has completed the design of the clay liner proposed for the NCCI Pit #1 perimeter. <br />Attached is the documentation required to provide the Division assurance that the <br />constructed liner will meet the State Engineers performance standard for lined gravel pit <br />leakage rates, as detailed in the "State Engineer Guidelines for Lining Criteria for Gravel <br />Pits ", including: <br />a. Reservoir liner construction drawings; <br />b. Technical specifications for the construction of the liner. The specifications include <br />the requirements for the materials, equipment, and construction methodology to be <br />used in the construction of the slurry wall, and Quality Control /Quality Assurance <br />testing and reporting required to ensure the quality /performance of the wall and <br />document the construction process. <br />c. NCC commits to providing to the Division as -built drawings and a final construction <br />report for the liner at the completion of the construction and leak testing of the liner. <br />The inclusion of this information enables NCC to be eligible for the regulated construction <br />financial warranty option (20% bonding option). <br />4 , 305 Denver Avenue, Suite D • Fort Lupton, CO 80621 • Ph: 303 - 857 -6222 • Fax: 303 - 857 -6224 <br />-./ A-F c�-- Iii t5T 2- 21-1-1-5 <br />