2015-07-14_HYDROLOGY - C1981035 (2)

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,5toncr engineering & 5urve ing Engineering, Testing & Surveying Date: July 6, 2015 To: Tom Bird Manager, Coal Services GCC Energy, LLC 5473 County Road 120 Hesperus, CO 81326 (570) 385-4528 From: Ryan Griglak, P.E. Project Manager Stoner Engineering & Surveying Re: King Coal I — Quarterly Water Quality Improvements Inspection On June 29, 2015, Ryan Grglak, P.E. visited the GCC Energy, LLC King I Mine site to conduct the quarterly inspection of the water quality features installed to prevent contaminated storm water runoff from escaping the site in events smaller than the 1170 -year storm event. There were approximately 6 -inches of water in the west pond (see Pic. 1) and 8 -inches of water in the east pond at the time of the inspection. The ponds are 'both generally in good condition. There has been some sediment build-up in the ponds but the required storage volume is adequate at this time. In the event that there are frequent storm events during the summer months, the ponds may need to have the excess sediment removed. The drainage ditches and pipes were in generally good condition (see Pic. 2). The drop inlet on Reach 7 noted in the previous report has been cleaned of debris and repaired to prevent infiltration of sediment into the piping system (See Pic. 3). The sub -surface erosion/washout at the corner of the waste haul road noted in the previous Inspection has been repaired (see Pic. 4). All ditches should be inspected and repaired as necessary, especially after storm events. The drainage for the overall site is functioning well and is generally in good shape. There were no items noted during the inspection which required attention. The drainage features have been constructed and are operating as stated in the drainage plan submitted to the Division of Minerals and Geology. P.O. Box 1163 28 South Washington Street Cortez, Colorado 81321 970.565.7483 stonerenaineer@frontier.net 970,565.7704