2014-06-10_INSPECTION - M1981286

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PERMIT #: M -1981 -286 INSPECTOR'S INITIALS: PSH INSPECTION DATE: May 21, 2014 OBSERVATIONS The Thomas Gravel Pit 4 was inspected by Peter Hays with the Division of Reclamation, Mining and Safety (Division /DRMS) as part of the Division's monitoring inspection program. Mr. Richard Thomas and Mr. Ray Thomas with RWT Excavating and Demolition LLC (RWT) were present during the inspection. The site was previously inspected by the Division on July 19, 2010. The site is permitted for 87.60 acres with a maximum allowed disturbance of 10 acres at one time. The Division holds a reclamation bond in the amount of $25,000. The mine entrance sign and boundary markers were observed as required by Rule 3.1.12(1). The mine site was transferred from Weld County to RWT in 2010. The Division records indicate during the conversion application process in 1992 Weld County committed to a maximum allowable disturbance of 10 acres at one time. The Division GPS surveyed the estimated affected area using a Trimble Juno 3B during the inspection. The survey indicated an affected area of greater than 30 acres. The affected area survey did not include the scale house and equipment storage area. The Operator should review the approved mining plan and submit a technical revision, per Rule 1.9, to update the mining plan as needed. An increase in the maximum affected acreage at one time will likely increase the required financial warranty. Mining activity has continued to the north and west since the last inspection. The remaining 50' wide section to be mined in the northwest corner of the site was stripped ahead of excavation. A processing plant and several material stockpiles were located on the pit floor. The mine highwall was estimated to be 10 feet high. The Operator stated the last time material was processed at the site was in October 2013. Material is sold from existing stockpiles as needed. The Operator was not sure if mining would continue below the existing pit floor after the last remaining area is mined. A large stockpile of imported limestone rock was stored in the southeast portion of the site. A scale house and equipment were located at the south end of the site. The approved post mining land use is general agriculture. Reclamation activities have begun along the western boundary of the site. The highwall has been regraded to a 4H:1V slope. Two well- vegetated topsoil stockpiles were located in the southwest and northeast areas of the mine site. No noxious weeds or erosion issues were observed during the inspection. The Division GPS surveyed the access road, estimated affected area and southwestern permit boundary marker. A copy of the survey map is attached. Photographs taken during the inspection are attached. Inspection Contact Address Mr. Richard Thomas RWT Excavating and Demolition LLC 3771 Road P Wiggins, CO 80654 Enclosure — GPS survey map Cc: Tom Kaldenbach, DRMS Page 2 of 4