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amounts of precipitation are diverted away from the azea or the moisture is removed from <br />the system before reaching the site. <br />Precipitation and Runoff <br />Major runoff can be expected to occur in the spring snowmelt months of March, April, <br />and May and during heavy thunderstorms in the summer months of July through October. <br />Peak runoff may occur during any of the spring runoff months depending upon regional <br />climatic conditions. Review of the historical climate of this area indicates that the peak <br />runoff normally occurs between April and May. Evaporation is less important during <br />periods of intense spring runoff and discrete rain events because of the short duration of <br />the precipitation events. Additionally, the slope of the land supports rapid runoff once <br />the ground becomes saturated and runoff begins. Evapotranspiration becomes important <br />when the ground is not saturated, is clear of snow, and the time between precipitation <br />events is long. When these conditions occur, the antecedent moisture condition is <br />reduced which results in an increased soil storage capacity. Increased soil storage serves <br />to increase the time between the beginning of the precipitation and initiation of runoff <br />(lag time). <br />Drainaees <br />The major drainage in the San Luis mine area is the Rito Seco, which transects the mine <br />property from east to west. The Rito Seco is a perennial drainage. There are several <br />arroyos and unnamed tributaries that join the Rito Seco along its length as it transverses <br />the mine site. These ephemeral drainages have surface flows only in response to high <br />precipitation events. These drainages are subject to erosion during periods of high <br />precipitation and runoff and therefore support little vegetation. <br />The largest drainage area in the vicinity of the tailing disposal area is an unnamed <br />drainage to the west of the tailing facility. This drainage is characterized by a wide sandy <br />bottom that has established vegetation and a relatively flat slope. Channel definition <br />becomes difficult as the drainage emerges onto the San Luis Valley; however, <br />topography and drainage patterns show that if drainage were to occur, the water would <br />flow to Culebra Creek approximately 5 miles south of the mine site. No flow has been <br />Battle Mountain Resources, Inc. Telesto Solutions, Inc. <br />,ate me sro.m~wne, m~~a8eme„~ pm,,.da~ 12 May 3, 1001 <br />