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May Day Idaho Mine Complex 112 (d) Permit Application <br />• Absorbent mats will be used to absorb moisture; <br />• Any impacted soil will be removed within 24 hours and disposed off-site in an <br />approved facility within 14 days. <br />(f) Containment Facilities Design Capacity <br />In accordance with the Storm Water Management Plan (Attachment T-4), chemicals will <br />be stored in either 55 gallon drums or in sacks. Chemicals stored within drums will be <br />placed into 70 gallon polyethylene secondary containments vessels. Containment <br />structures are designed and certified by a registered Colorado Professional <br />Engineer. <br />6.4.20(8) Groundwater Information <br />(a) Map <br />Water information required by Rule 6.4.21(8) a is presented on Figure C-6, Exhibit C. <br />(Attachment H) <br />(b) Known Aquifers and Related Subsurface Water Bearing Fracture Systems Within 2- <br />miles <br />The permit area is located at the northern boundary of the San Juan Hydrogeologic Basin <br />(Topper et. al., 2003). The Morrison Aquifer is the only hydrogeologic unit of the San <br />Juan Basin present within the permit area and is stratigraphically higher than the ore- <br />bearing zones. The May Day and Idaho mines are located within southward-dipping <br />sedimentary rocks cut by a series of east-west faults. The May Day-Idaho Fault System <br />are two eastward-trending reverse faults, each with a down throw to the south with <br />vertical displacement along the two faults of 350-475 feet. <br />The sedimentary units associated with the San Juan Basin are shown below with units <br />within the workings shaded (Sources: Eckel, 1949; Topper et. al., 2003): <br />Age Formation San Juan Basin Hydrologic <br /> <br />LUppe: Cretaceous <br />Mancos Shale H dro eolo is Unit <br />Confining Layer Characteristics <br />Well yields as much as 10 g pm <br /> Dakota Sandstone Dakota Aquifer Well yields as much as 10 g pm <br />pper Jurassic Morrison Formation Morrison Aquifer Well yields as much as 25 m <br /> Junction Creek Sandstone <br /> Wanakah Formation <br /> Entrada Sandstone Not significant in Colorado <br />Jurassic and Dolores Formation Not considered significant in Colorado <br />Upper Triassic <br />Permian Cutler Formation Base of San Juan Basin <br /> Rico Formation <br />Pennsylvanian Hermosa Formation <br />REVISED June 5, 2011 <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />v <br />8