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Stoner- rngineening & Surveying <br />Engineering, Testing & Surveying <br />[late: April 2, 2019 <br />To: Jordan McCourt <br />Project Coordinator <br />GCC Energy, LLC <br />6473 County Road 120 <br />Hesperus, CO 81326 <br />(970) 385-4528 <br />= `- <br />VIA <br />From: Ryan Griglak, P.E. <br />Project Manager <br />Stoner Engineering & Surveying <br />Re: King Coal I — Quarterly Water Quality Improvements Inspection <br />On March 30, 2019, Ryan Griglak, P.E. visited the GCC Energy, LLC King I Mine site to conduct <br />the quarterly inspection of the water quality features installed to prevent contaminated storm <br />water runoff from escaping the site in events smaller than the 100 -year storm event. <br />Both ponds contained water and had captured additional sediment recently at the time of the <br />inspection (see Pic. 1). The ponds both appeared to generally be in good condition though the <br />amount of additional sedimentation from the last inspection was noticeable (see Pic. 2). The <br />required storage volume appears to be adequate at this time based upon the measuring gages <br />(see Pic. 3). The ponds should continue to be monitored after storm events to ensure that <br />excess sediment does not reduce the required storage capacity available for storm water <br />runoff. <br />Due to the recent storms, warmer weather, and ongoing placement of stockpiled material, <br />there are culverts and drainage ditches that are in need of cleaning maintenance. Repairs were <br />ongoing at the time of the inspection. The sedimentation traps at the entrance to the site have <br />been cleaned and reconstructed (see Pic. 4). <br />The pipe inlet into the east pond has experienced some damage due to snow/sediment <br />removal operations. In addition, it appears that the ongoing maintenance of the inlet pipe has <br />resulted in material being placed within the pond/berm area at the inlet location. This material <br />should be removed as soon as possible before the material is washed into the base of the east <br />pond. <br />The ditch connecting the culvert sections of Reach 7 north of the old bath house building has <br />experienced sedimentation (see Pic. 5) and should be cleaned to ensure the existing culverts do <br />not experience excessive sedimentation and inhibit runoff flowing though the site, <br />P.O. Box 1163 28 South Washington Street Cortez, Colorado 81321 <br />. 970.565.7483 stonerengineer@frontier.net 970.565.7704 <br />