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Many of the upper basin wells record strong seasonal fluctuations with the highest water levels <br />correlating to snow melt and spring runoff events. <br />Prior to the closure of the Black Cloud mine, the mine was the greatest producer of pumped groundwater <br />in Lake County. Today, the groundwater provides water for Lake County domestic uses. <br />Water quality in the upper Arkansas River basin alluvium is generally potable with <br />elevated metals produced by effluent natural acid rock drainage and septic system..,( <br />(Groundwater Atlas of Colorado, 2003). <br />Climate <br />Average annual precipitation is 12.19 inches (3 10 mm). Thewette <br />inches (562 mm) and the driest year was 1994 with 8.81 inche"'12 <br />precipitation in one month was 4.83 inches (123 mm) inJanuary 1 <br />24 hours was 2.10 inches (53 mm) on December 24;`198:, <br />inches (3,620 mm). The most snowfall in one yearwas 247; <br />most snowfall in one month was 63.2 inches (1,61 W, iii).in <br />Average annual lake evaporation range betw,(6ri;3 to 45 inches; <br />from less than 5 inches along the Front Rdnge to 20,incli8- -dr,mc <br />verage al <br />,inches ( <br />of <br />22.14 <br />-,,The most <br />li &m st precipitation in <br />Lal °snowfall is 142.7 <br />00 mm) in 1996. The <br />ear. Average annual runoff ranges <br />at the headwaters of the major rivers. <br />Leadville (Table B -1) has an alpiriesubarciic ocliTat6(Leadville Elevation 10,152 feet) with cold <br />winters and mild summers, borderirig-, -' &a cold semi =arid climate. The average January <br />temperatures are a maxim, "uin ofl',1 °F ( =0.5 °G)' and a minimum of 3.1 °F ( -16.1 °C). The <br />average July temperatuies`'ar �;a, m�aCimum q:72.2 °F (22.3 °C) and a minimum of 37.8 °F (3.2 <br />°C). There are averages;of 27821ays annually with freezing temperatures, which can occur in any <br />month of the yeaff •The record lirg� temperature was 86 °F (30 °C) on June 23, 1954. The record <br />low temperature_was —38 ° :(_ -39 8p) on February 21, 1995. <br />.i t. <br />Soils (Settiot�b.3:�a) <br />s:= <br />Sotls�'wathin th`e' permit -area are thin (less than 2 inches thick) well drained gravelly sandy loam. <br />Slopes within in pe area range are generally less than 3 percent. <br />- 3✓ <br />Vegetation (Section 6.3.2 (a) <br />Vegetation consists of native grasses fescue, bluegrass, nodding brome, junegrass, western <br />yarrow (MRCS, 1990). <br />January, 2013 <br />Lockland, LLC <br />Hopemore Shaft <br />Leadville, Colorado _ <br />