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Stoner Engineering & Surve�ing <br />Engineering, Testing & Surveying <br />Date: October 3, 2016 <br />To: Tom Bird <br />Manager, Coal Services <br />GCC Energy, LLC <br />6473 County Road 124 <br />Hesperus, CO 81326 <br />(970) 385-4528 <br />From <br />Ryan Griglak, P.E. <br />Project Manager <br />Stoner Engineering & Surveying <br />Re: King Coal li - Annual Water Quality Improvements Inspection [Amended] <br />On September 30, 2016, Ryan Griglak, P.E. visited the GCC Energy, LLC Icing Coal II site to <br />conduct the annual inspection of the water quality pond installed to prevent contaminated <br />storm water runoff fro escaping the site in events smaller than the 100 -year storm event. <br />There were approximately 6 -inches of water (Surface El. = 7226.8) in the water quality pond at <br />the time of the inspection. The elevation at the bottom of the pond was determined to be at <br />an elevation of 7226.6, 16 -inches below the concrete of the outlet structure. Based upon this <br />elevation, the pond can collect an additional three (3) feet of sediment before reaching the 60% <br />cleanout level (El. = 7229.25). The current sediment level in the detention pond represents less <br />than 10% of the allowable 1.57 [ac -ft] of sediment which is the 60% cleanout level as shown in <br />the Sediment Pond Stage Discharge Curve prepared by EIS Environmental & Engineering <br />Consulting dated 12/18/08. <br />The vegetation established both inside and out of the pond is well established to minimize the <br />erosion impacts of storm runoff. The outlet structure shows no signs of damage and was <br />functioning as designed at the time of the inspection (see Pic. 1). The water quality pond <br />appears to be in generally good condition. There were no signs of weakness or distress to <br />either the outlet structure or the embankment material. The water quality pond has the <br />storage capacity to function as designed. <br />P.O. Box 1163 28 South Washington Street Cortez, Colorado 81321 <br />970.565.7483 stonerengineer@fronter.net 970.565.7704 <br />