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LEAK LOCATION SERVICES, INC. <br />16124 UNIVERSITY OAK ! SAN ANTONIO, TEXAS 78249 ! (210) 408-1241 / FAX (210) 408-1242 <br />September 1, 2016 <br />Mr. Joe Hickey <br />Newfields <br />9400 Station Street <br />Lone Tree, CO 80124 <br />Email:JHickey@Newfields.com <br />Subject:Report for “Geomembrane Leak Location Survey of a Portion of Phase One of the <br />Squaw Gulch Valley Leach Facility near Cripple Creek, Colorado”; <br />LLSI Project 2516 <br />Dear Mr. Hickey, <br />On August 30, 2016, Edgar Barraza and James Haynes of Leak Location Services, Inc. <br />(LLSI) conducted a leak location survey on the primary geomembrane of a portion of Phase One of <br />the Squaw Gulch Valley Leach Facility near Cripple Creek, Colorado. The site has an area of <br />approximately 121,000 square feet and is lined from the bottom up with a prepared subgrade, <br />approximately one foot of clay, 80 mil textured LLDPE primary geomembrane, and approximately <br />two feet of one and a half inch rock drainage gravel. The site is almost entirely comprised of 2H:1V <br />slopes. This report documents the results of the survey. <br />I.RESULTS <br />No leaks were found during the survey of Phase One. The drainage gravel covering the <br />geomembrane, however, could not be electrically isolated from earth ground per Client personnel. <br />Thus, leak detection sensitivity may have been compromised during the survey. <br />II.TECHNIQUE <br />A.Principles of the Electrical Leak Location Method <br />The principle of the electrical survey method for geomembrane liners is to impress <br />a high DC voltage across the liner and measure the resulting potential gradients on or in the <br />conducting material on the liner. If any holes are present, characteristic anomalies in the potential <br />measurements caused by electrical current flowing through the holes indicate their location. <br />OVER TWENTY YEARS <br />www.llsi.com results@llsi.com