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Figure G-4. Map of San Juan River Watershed <br /> .J <br /> f <br /> • References: <br /> http://cfpub.epa.gov/surf/huc.cfm?huc code=14080107 <br /> http://biology.unm.edu/stacey/Functional%20Assessment%20of%20the%2OMancos%2ORiver%2OWatershed.pdf <br /> http://www.usbr.qov/uc/Iibrary/envdocs/ea/mancos—valley/ <br /> State databases: http://165.127.23.41/websitellttools/index.asp?iw=800&ih=600 <br /> http://l65.127.23.41-StatelMS(Colorado's Decision Support Systems) <br /> 3. Other available data: No other information for recorded water rights was available from published data. <br /> 4. Changes to drainage basins caused by operations on site: <br /> There will be no significant and permanent changes in watershed boundaries caused by operations on site. As <br /> discussed in the reclamation plan, mining may slightly change the boundary between the Martinez and Dutton Creek <br /> watersheds. (Less than 1/2% of the watersheds: less than 10 acres.) It will not significantly impact flows or points of <br /> entry into the watersheds. <br /> Other than disturbances in vegetation, area exposed to erosion, and evaporation, the only significant change <br /> in drainage basin characteristics is the blocking of potential surface flows from pit and working areas during the life of <br /> the pit and after reclamation, resulting in increased infiltration into the surficial alluvial deposits and shale bedrock <br /> beneath the material being mined. The impact will be minimal, as less than 0.001% of the total Martinez watershed <br /> will be blocked from surface discharge at any one time during mining and reclamation operations. <br /> 5. Aquifers and watersheds in this area: <br /> There are no recognized aquifers in the area due to the various members of the Mancos Shale which underlies the <br /> Site and its alluvial and colluvial deposits.Although at least one well is registered as getting water from the Mancos, if <br /> that is correct, the water is almost certainly coming through fracture. The alluvial aquifer associated with Dutton and <br /> Martinez Creeks is potentially a source of water, and the landowner reserves the right to drill wells for livestock and <br /> other use, with proper registration and authorization from the State Engineer, during and after mining and reclamation. <br /> The overburden (including soil) and the alluvium/colluvium are not significant aquifers in this area4. Based on the <br /> 4 Per conversations with Natural Resource Conservation District personnel. <br /> C&J Gravel Products, Inc. Page 35 of 93 20 OCT 2021 <br /> Application for Permit: Oakbrush Hill Gravel M-2021- C&J-DPR-V5-001 <br />