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5.1 . Surface Water Handling <br /> 5.1.1. Mining <br /> Surface water will be controlled within each mining phase through the installation of a <br /> stormwater berm and rock/recycled concrete check dams. Water collected in the active mining <br /> phase will be allowed to evaporate or will infiltrate the porous ground surface. Ponds will be built <br /> in the east and west ends of the mining area to contain large (100-YR, 24-HR) storm events and <br /> the sediment said events may generate. Appendix G-2 contains all hydrologic calculations and <br /> design. <br /> 5.1.2. Post Reclamation <br /> Drainage patterns during mining will be retained following reclamation of the site. Map G-1 <br /> shows these drainage patterns. The intermittent drainage that passes through the site, as <br /> shown on Map C-1, will be rebuilt as a broad swale. The design can be found in Appendix G-2. <br /> 5.2. Disturbed Area Runoff <br /> During all stages of mining, there is enough water storage capacity to contain the 10-year and <br /> 100-year 24-hour storm events and prevent erosion from surface water discharge. Stormwater <br /> volumes for these events are listed on Map G-2. Hydrologic calculations for these storm events <br /> can be found in Appendix G-2. <br /> 6. Groundwater <br /> Limited groundwater interaction will occur at the site. Limited groundwater can be seen <br /> seasonally at the gravel and shale contract. If persistent groundwater is discovered, it will <br /> promptly be buried with a minimum of 2-feet of backfill. <br /> Groundwater is located within the Yampa River Valley to the north of the site. The watertable <br /> there is approximately five to ten feet below the ground surface. This was determined from well <br /> records of the surrounding area. Table G-2 outlines all wells within 600' of the permit area. This <br /> well location is shown on Map C-2. Ground water will not be impacted by this operation. <br /> Table G-2. Wells Within 600' of Permit Area <br /> Applicant Permit ID Total Purpose Distance from <br /> Depth nearest mining <br /> (feet) area(ft) <br /> Temple Family Revocable Trust 94196--A 39 DOMESTIC —600 <br /> 7. Water Related Permits <br /> The operator is applying for all necessary permits that are not already in place for water <br /> handling at the site. This includes a comingled process water and stormwater discharge permit <br /> with the Colorado Department of Public Health and the Environment. <br /> Yampa Valley Gravel Pit <br /> August 2025 G-3 111 1,o%icl;i 1ssaeiacea <br />