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2003-03-18_REVISION - C1981008
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2003-03-18_REVISION - C1981008
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Last modified
8/24/2016 3:15:40 PM
Creation date
6/11/2010 2:14:49 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981008
IBM Index Class Name
Revision
Doc Date
3/18/2003
Doc Name
Proposed Decision & Findings of Compliance for RN4
Type & Sequence
RN4
Media Type
D
Archive
No
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the deeper soils, the ditch bottom is periodically cleaned out (dredged). The overall gradient of the <br />West Lateral irrigation ditch is approximately .014 ft/ft. <br />Flow in the West Lateral irrigation ditch is exclusively controlled by the Colorado Co-operative <br />Company. The ditch is "turned on" usually in mid-April, and continues to operate up until about <br />mid-October, depending on the length of each yeaz's growing season. During the remainder of each <br />yeaz, the ditch is temporarily turned on to provide water for filling cisterns and stock ponds. Water <br />delivered via this lateral and the rest of the surrounding ditch system provides a water source for <br />irrigation, drinking water and livestock use, and is the dominant seasonal influence of the hydrologic <br />regime in the vicinity of the New Horizon Mine. <br />Most reaches along the West Lateral lose irrigation flow to diversions, evapotranspiration and, of <br />course, seepage. The reaches that showed a loss in flow had water being withdrawn along each reach <br />through diversions on the day the study was performed, as well as significant lengths of heavily <br />vegetated bank sides. Seepage of irrigation water occurs along the entire reach of the West Lateral, <br />probably occurring at higher rates and volumes along the "ridge-top" reach where the ditch was <br />excavated through the shallow soils into the highly fractured sandstone. <br />The two reaches where the ditch featured gains in flow aze portions of the general "ridge-top" <br />segment of the West Lateral. The ditch channel bottom in this reach is largely fractured and <br />weathered sandstone, and likely results in relatively lazge amounts of seepage. This seepage, in <br />combination with localized intensive "flooding-type" irrigation, travels laterally through the shallow <br />soils and fractured sandstone eventually flowing back into the West Lateral slightly downstream. <br />The combination of fractured, weathered sandstone channel bottoms in the ditch and Iocatized <br />"flood-type" irrigation along these two gaining reaches likely resulted in the measured gains inflow. <br />Flows in Calamity Draw generally reflect local irrigation practices. Water from the West Lateral <br />Ditch's return irrigation flow is its primary source. Very little supplemental flow is derived from <br />precipitation and snowmelt runoff. In 1987, measured flow rates in Calamity Draw vaned from <br />0.605 cfs in April to 13.4 cfs in July. Flow in Calamity Draw varied from 1.04 to 2.06 cfs during the <br />non-irrigation period. Shallow ground water alluvial sources provide a lazge portion of this low flow <br />period's water. This ground water flow is related to local irrigation practices but is consolidated into <br />a more uniform and regulaz flow by the permeability of these neaz surface alluvial deposits. <br />Sediment Pond 007 for the New Horizon Mine 2 mining site will contribute water to the Calamity <br />Draw system. The drainage system at the New Horizon 2 site has been designed to provide adequate <br />capacity and storage times to completely control a 10-year 24-hour precipitation event. This system <br />will collect all mnoff from the mine site and should actually lower present total suspended solids <br />(TSS) contribution from this azea over the life of the mine. Increased TDS levels in this water from <br />mining disturbances are expected but aze projected to be within acceptable discharge levels and will <br />be mitigated by dilution. Regular monitoring of these flow rates and water quality will give adequate <br />control of this current water source to protect water quality in Calamity Draw. The dischazges from <br />the mine enter Calamity Draw at a point about 2.5 miles above the confluence of Calamity Draw and <br />the San Miguel River. <br />The above-mentioned pazks consist of recent undifferentiated aeoliansilts and sands overlaying the <br />Dakota and Burro Canyon Formations. The perennial flow nature of both Tuttle and Calamity <br />
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