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Page 4 of 18 <br />1 INTRODUCTION <br />This is a groundwater monitoring plan (GWMP) for the Grand Island Resources LLC <br />(GIR) Cross Gold Mine operating under Colorado Permit M1977-410. The plan is <br />required by Colorado Division of Reclamation, Mining and Safety (DRMS) rules and is <br />being submitted in partial requirements for the current permit. The DRMS guidance <br />document “Groundwater Monitoring and Protection Technical Bulletin”of November 19, <br />2019 was used in preparation of this site-specific monitoring plan and this plan conforms <br />to DRMS guidance. Tables, Maps, and Figures follow the main body of the plan. <br />Supplementary documents are attached as Appendices. This plan was originally written <br />in 2021 and it has been revised in accordance to DRMS comments made to the <br />document in its March 25, 2022 letter and other technical review criteria that is known <br />about site specific conditions. Edits have also been made to the geologic sections as <br />the prior author missed some local controls on infiltration and water storage. <br />The Cross Mine surface site is located within Sections 5, 8, and 9, in Township 1 South <br />and Range 73 West or 39°58'41.3"N latitude and 105°34' 20.9"W longitude (UTM <br />coordinates 4,425,324N and 548,861W, Zone 48, N), being approximately 3 miles west <br />of Nederland, Colorado. The street address of the facility is 4415 Caribou Road, <br />Nederland, CO 80466. The general location of the property is depicted in Map 1 and the <br />features of the property are displayed in Map 2. <br />Two small areas separate from the main mine site (not shown in the Figures) have been <br />added to the M1977-410 permit disturbance area; the Caribou 300 Level Portal and the <br />Potosi Shaft. These two parcels, totaling 0.39 acre combined, are intended for future <br />use as mine ventilation and access. Use of these areas is not reasonably expected to <br />alter the hydrologic balance or water quality at the site, or beyond, and they are not <br />included in the groundwater monitoring plan for that reason. The groundwater monitoring <br />plan is to monitor groundwater quality within the 9.60-acre disturbance area depicted in <br />Map 2. The DRMS disturbance boundary in Map 2 is proposed here as the compliance <br />boundary with respect to groundwater monitoring. <br />Colorado hard rock mining operations have requirements to minimize degradation of the <br />hydrologic environment. The DRMS has primacy for groundwater monitoring at hard <br />rock mines. DRMS is the implementing agency for groundwater monitoring compliance <br />standards and regulations set by the Colorado Department of Public Health and <br />Environment (CDPHE) Water Quality Control Commission (WQCC - standards setting) <br />and the Water Quality Control Division (WQCD - technical evaluation and enforcement) <br />at hard rock mines. Groundwater monitoring planning, implementation and reporting by <br />the mine must conform to WQCD Regulation No. 41 –The Basic Standards for <br />Groundwater, and Regulation No. 42 Site-Specific Water Quality Classifications and <br />Standards for Groundwater. <br />The CDPHE WQCC has not established Regulation 42 use classifications or site- <br />specific numerical standards for groundwater quality beneath the mine; other than <br />applicable state-wide standards. The Cross Mine is subject to the state-wide water