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3. Surface Hydrology <br /> Prior to mining,the permit area has a shallow slope to the northwest. Pre-mining topography is <br /> shown on Map E-1. All of the runoff on the undisturbed site runs to the northwest generally <br /> parallel to State Highway 141 and the San Miguel River. The current river elevation is <br /> approximately 450 feet lower than the lowest area within the active mine site. Surface drainage <br /> features in the vicinity of the permit area are dry. <br /> Stormwater will be kept from entering the site from the east by the shallow ditches and<3-foot- <br /> tall berms that surround the site following the perimeter. Stormwater that occurs on site will <br /> remain on site by perimeter berms and ditches; however,the porous surface of the site will allow <br /> for all stormwater to infiltrate the site and pit floor within 72 hours. <br /> No water wells are shown within 600' of the Weimer Ranches#4 Mine 2.No groundwater or <br /> aquifers are expected to be encountered during operations. The operation is not expected to <br /> directly affect surface nor groundwater systems, because there is no near-surface groundwater <br /> table and very little surface water run-off. The sparse surface precipitation is for the most part <br /> absorbed into the surface soils. There are no nearby naturally occurring nor man-made streams, <br /> springs,wells, seeps, lakes,ponds, reservoirs, nor ditches, nor other water resources. <br /> Groundwater is expected to be>-30 feet below the lowest point of the active mining area. As the <br /> depth of mining is—15 feet, groundwater is not expected to be encountered during any Stage or <br /> stage of mining. In the event that groundwater is encountered, excavation will be halted and the <br /> area will be backfilled with at least two feet of site excavated material.No mining will occur <br /> beyond the depth where groundwater is encountered. <br /> 4. Vegetation <br /> Vegetation on site is typical sparse rangeland shrubs and grasses for this area. Common plant <br /> species on site include: big sage brush,broom snakeweed,ephedra,yucca, senecio,prickly pear, <br /> Z https://gis.colorado.gov/dnrviewer/Index.html?viewer=dwrwelipermit <br /> Weimer Ranches #4 Ort i—icW&"A., Wlm P.I. <br /> June 2021 B-2 <br />