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r <br /> Up-Gradient °E°`„ 9 thAC j <br /> C-SR 13A y]y <br /> 7Ir `5 <br /> Burro <br /> Mine End <br /> .;Vent Mid Graftpc- T044N Legend <br /> T044N Alternate <br /> � /A - . <br /> R019�V� Burro �j fhillholc SR-243 <br /> River Mine Prrq,osed Monitor Wells <br /> Down Ve _., eom7r , <br /> SttQaaDown Ellison `' " " ^--- Existing GEMlOmund <br /> ntDecline n <br /> Monitoring Z <br /> _ O <br /> a <br /> C-SR-13 t�.,, + Burn,Vent Alternate Mid Q <br /> J Down radient w <br /> is p <br /> ExistingOEMlStvfacc v <br /> River UPP Monitoring Z <br /> StrearH�°r ! - Existing Mine Workings ceO <br /> Q\01 Project Boundary <br /> Additional DOE Lease Areas 0 <br /> i - 0 PLSSTounship G <br /> TO43N I PISS Section ,� N <br /> R019W TG43N R018W ( O <br /> 0 0,25 0.5 0.75 1 p' �><Al <br /> Miles c <br /> Proposed Monitoring Well Locations <br /> Hydrogeology Background <br /> Dakota Sandstone <br /> The Dakota Sandstone is composed of fine to medium-grained sandstone that ranges from <br /> non-cemented to well-cemented. Interbedded with the sandstone are carbonaceous shales, <br /> low-grade coals, and mudstone.According to the EPA remedial investigation report for the <br /> area, "the Dakota may be water-bearing only locally. Generally,the erosional remnants of the <br /> Dakota in the Uravan area are unsaturated, but may allow recharge to the Burro Canyon." <br /> Burro Canyon Formation <br /> The Burro Canyon Formation is composed of as much as 85 percent sandstone with <br /> individual sandstone beds. Green shale or siltstone, red or purple shale, and locally, thin gray <br /> nodular limestone is also present in the formation. <br /> Because the sandstones of the Burro Canyon are generally lenticular and tightly cemented, <br /> intergranular permeability is very low. South of the San Miguel River on Club Mesa,the <br /> Burro Canyon exists as isolated erosional remnants,whereas north of the river it caps much <br /> of the area. The erosional remnants are likely unsaturated. <br /> Slick Rock Project Groundwater Sampling and Analysis Plan-2025 <br /> Slick Rock NOI Modification July 2025 <br /> Appendix C Page 6 of 35 <br />