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l � <br /> V.) '�' RECEIVED <br /> _ _ t�111ka Western Water [and , Inc. MAR 3 02020 <br /> II! DJVISION OF RECLAMATION <br /> MINING AND SAFETY <br /> March 20,2020 <br /> Mr.Lucas West <br /> Environmental Protection Specialist <br /> Division of Reclamation,Mining and Safety <br /> 101 South 3'1,Suite 301 <br /> Grand Junction,CO 81501 <br /> RE: Submittal: Sunday Mine Complex Hydrogeology Report <br /> Dear Mr.West, <br /> Western Water& Land, Inc. (WWL), on behalf of Pinon Ridge Mining LLC (PRM), is submitting the accompanying <br /> Sunday Mine Complex Hydrogeology Report (Report). The Report was prepared to document the hydrologic <br /> characterization component of the uranium/vanadium mining operation at the Sunday Mine Complex (SMC) in San <br /> Miguel County,Colorado.The hydrogeologic study was conducted to support regulatory permitting requirements for the <br /> SMC, as administered by the Colorado Division of Reclamation, Mining and Safety (DRMS) and the U.S. Bureau of <br /> Land Management (BLM). Specifically, the report will augment the Environmental Protection Plan as required by <br /> DRMS and the Topaz Mine Plan of Operations required by the BLM. <br /> The SMC consists of five existing underground mines within close proximity to one another (Figure 1-2). The five <br /> mines included in the group are from east to west: <br /> • The Sunday Mine—DRMS Permit No.M-1977-285 <br /> • The Carnation Mine—DRMS Permit No.M-1977-416 <br /> • The St.Jude Mine—DRMS Permit No.M-1978-039HR <br /> • The West Sunday Mine—DRMS Permit No.M-1981-021 <br /> • The Topaz Mine—DRMS Permit No.M-1980-055HR <br /> Mining at the SMC has occurred intermittently since the 1950s by various mining companies. PRM currently controls <br /> approximately 233 unpatented mining claims at the SMC. <br /> A key component of the hydrogeologic study focused on the installation and monitoring of four monitoring wells at the <br /> SMC.The wells were installed in 2012 and 2013 and have been monitored since installation.These wells included MW- <br /> TPZ1 (waste rock area), MW-SUN1 (point of compliance well), MW-SUN2 (intermediate well), and MW-SUN3 <br /> (ambient well). With exception of the MW-TPZ I well, which monitors for groundwater downslope of the waste rock <br /> area, the wells were completed in the Top Rim Sandstone of the Salt Wash Member of the Morrison Formation. The <br /> Top Rim Sandstone is the sandstone unit being mined at the SMC. <br /> Monitoring activities at the wells included water level measurements and water quality sampling (eight events); slug <br /> testing was conducted at MW-SUN1 and MW-SUN2.Analytical data from the first six quarterly sampling events of the <br /> Applications in Earth Science 743 Horizon Court Suite 330,Grand Junction,CO 81506 <br /> Phone:(970)242-0170 Fax:(970)242-0270 <br />