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Denver Brick Company AEE Project E96.7084 <br />Stevens Lease Clay Mine January 8, 1998 <br />Douglas County, Colorado Page (61 <br />The lower Dawson Formation is fine-grained sandstone, carbonaceous shale, and lignite, <br />underlain by the Denver, Arapahoe, Laramie Formations, and Foxhills Sandstone and Pierre <br />Shale. All but the Pierre Shale are regional aquifers. <br />According to the Douglas County Environmental Hazards map contained in the Douglas <br />County Master Plan, there are no geologic hazards identified for the site area. <br />4.4.2 Hvdroloav <br />Groundwater <br />Four major bedrock aquifers underlie eastern Douglas County (including the proposed mine <br />site). From deepest to shallowest, these are the Laramie-Fox Hills, Arapahoe, Denver, and <br />Dawson. The upper Dawson Aquifer is at or near the surface across much of Douglas <br />County. This is a water source throughout much of Douglas County and is an important <br />source of water in domestic wells. It is widely exposed and probably receives a significant <br />amount of recharge across eastern Douglas County. <br />~ According to water well records on file with the Colorado State Engineer's Office, water wells <br />in the area of the proposed mine site (approximate one-mile radius) draw from the Dawson <br />Aquifer and other unidentified aquifers. Water levels in the registered wells range from 20 <br />feet to 370 feet below the surface for wells in unidentified aquifers throughout the one-mile <br />radius. Water levels of wells in the lower Dawson Aquifer range from 250 to 445 feet below <br />ground surface. No water levels are indicated in the records for the registered wells in the <br />upper Dawson Aquifer within the area of the proposed mina property. <br />Mining is expected to be to a maximum depth of 45 feet and will not penetrate the water <br />table. Shallow groundwater has not been encountered in test bore holes drilled to 50 feet <br />below the ground surface located within the mine pit areas. <br />Surface Water <br />A minor ephemeral drainage (Mellon Gulch) passes through the mine property from northwest <br />to southeast, entering Lemon Gulch approximately 150 feet southeast of the proposed permit <br />boundary. This drainage will not be mined. <br />Lemon Gulch is an ephemeral drainage flowing northeast to Cherry Creek approximately two <br />miles northeast of the mine site. <br />4.4.3 .Suooly and Demand . <br />t Red-firing clay is a necessary component in the manufacture and sale of red brick. Denver <br />Brick Company has mined red-firing clay from the Williamson mine south of Parker in Douglas <br />t County since 1962. The supply of clay from this mine is exhausted and other sources of red- <br />firing clay must be mined in order to maintain a supply of red brick for customer demand. It <br />' is absolutely vital to the survival of Denver Brick Company to manufacture red brick. <br />' Earth & Environmental <br />F <br />