2022-02-24_INSPECTION - M2021059

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PERMIT#:M-2021-059 INSPECTOR'S INITIALS:PSH INSPECTION DATE:December 16,2021 OBSERVATIONS This was a pre-operational inspection of the proposed Dunn Pit conducted by Peter Hays and Rob Zuber with the Division of Reclamation, Mining and Safety(Division/DRMS). Ms. Stephanie Fancher-English with Loveland Ready-Mix Concrete, Inc.was present during the inspection. The 112 construction materials permit application was received by the Division on September 13, 2021. The application was deemed complete on November 1, 2021. The Applicant published public notice as required by Rule 1.6.2(d)for four consecutive weeks. The last notice was published on November 24, 2021. The public comment period for the application ended on December 14, 2021. No letters of objection to the application were received by the Division during the public comment period. The notice sign was observed during the inspection as required by Rule 1.6.2(b). The Dunn Pit is a proposed 114.25 acre construction materials site with approximately 76 acres disturbed by mining excavation and approximately 38 acres for boundary offsets,the access road,the Big Thompson River corridor and stormwater management areas. The proposed mine site is currently used as pastureland for cattle grazing. The site is located approximately 1 mile northwest of Milliken, CO in Weld County. The mine site is proposed to be mined to bedrock utilizing an excavator to wet mine the site. The mining areas will not be dewatered during the mining activities. The mining activities are proposed in three (3) cells ranging in size from 11 to 36 acres. The mined slopes are proposed to be excavated at 1.5H:1V. The mined material will be stockpiled to allow the material to drain. The drained material will be transported off-site by trucks. No processing will occur at the site. The depth of the sand and gravel deposit ranges from 25 to 28 feet with 1 to 2 feet of topsoil above the deposit. The bedrock is weathered shale. A bridge crossing is planned to be constructed over the Big Thompson River to access the north side of the site. The proposed post-mining land use for the site is wildlife habitat with the construction of three (3) groundwater ponds. The construction of 2.55 acres of new wetlands during reclamation is possible. The Applicant has contacted the Army Corps of Engineers to discuss the need for a 404 permit. The disturbed areas above the waterline of the ponds will be topsoiled and revegetated with an upland seed mixture. A wetland seed mixture is also proposed to be used if the wetland areas are constructed by the Applicant. The proposed mine site was observed during the inspection. The site was observed from WCR 48.5 and the interior of the site was observed from the existing oil and gas road and by traveling off-road across the site. The site vegetation consisted of a pastureland with areas of well-established trees and grasses. Cattle were observed grazing the land during the inspection. All utilities along WCR 48.5 appear to have been identified by the Applicant. The Division's permit application adequacy review letter was sent to the Applicant on January 4, 2022. The current decision date for the application is March 1, 2022,following the approval of a decision date extension request from the Applicant on January 19, 2022. Photographs taken during the inspection are attached. If you need additional information or have any questions, please contact me at the Division of Reclamation, Mining and Safety, 1313 Sherman Street, Room 215, Denver, CO 80203, by telephone at 303.866.3567 x 8124, or by email at peter.hays@state.co.us. Page 2 of 8