2024-04-29_REVISION - M2022001 - Laserfiche WebLink

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CIVIL RES'JURCES, LLC ENGINEERS & PLANNERS November 17th, 2023 r Colorado Division of Reclamation and Mining Safety Mr. Peter Hays 1313 Sherman Street, Room 215 Denver, CO 80203 RE: Technical Revision -Section 20 Mine(Permit M-2022-001),Weld County, Colorado Dear Mr. Hays: Red Tierra Equities, LLC requests a Technical Revision 1 (TR-01) to Permit M-2001-046 to set pre-mining baseline groundwater analyte parameters and to request a reduction to the bond amount. Background The Section 20 Gravel Mine Construction Materials Reclamation Permit Application was approved by the Division of Reclamation Mining and Safety on March 9, 2023. Red Tierra is currently in completeness review for a Weld County Use by Special Review permit and it is expected that this process will not be completed this year. Jalisco International, Inc. holds a Construction Materials Special 111 Construction permit at the Site in the future location of the proposed slurry wall lined Cell 8. Red Tierra committed to initial groundwater sampling at monitoring wells MW-2 and MW-5 to establish baseline water quality for the site. This sampling was performed on August 8th, 2023. Red Tierra's Groundwater Monitoring and Mitigation Plan requires yearly analytical testing of MW-2 for the analytes listed in Tables 1 through 4 of "The Basic Standards for Ground Water." Discussion of Baseline Groundwater Analysis Results Samples were taken in the afternoon of August 8th, 2023 and were sampled in accordance with the, "Manual of Ground- Water Quality Sampling Procedures," Scalf, 1981. Depth to groundwater was obtained using at Heron Dipper-T water level indicator. The volume of groundwater inside the well casing was calculated using the depth to groundwater and total well depth. The wells were bailed with a 1.5-inch diameter 36-inch long polyethylene bailers pulled by#15 white nylon twine. The volume of water bailed for each well was five (5) times the volume of water contained in the well casing: 13.1 gallons for MW-2 and 15.3 gallons for MW-5. Samples were collected with new polyethylene bailers and poured into a glass beaker utilized for filling the sample bottles. Sample collection protocol for each type of analyte was provided by Colorado Analytical Laboratory and these protocols were followed by Civil Resources personnel. Of the thirty-five (35)analytes reported, six(6)in both MW-2 and MW-5 were above the standard set forth in Tables 1-4. The analytes above the compliance standard are listed below: 8308 COLORADO BLVD •SUITE 200• FIRESTONE, CO 80504•PHONE: 303.833.1416