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8 <br />• with 758 occurring in the May to October period. (See Tech. <br />Paper 37, U.S. Dept. Ccnmeree, 1959.) <br />ELEVATION AMID ~POC~APHY <br />The NUCLA Mine Lease lies on a gently to strongly rolling plateau <br />or bench above the San Miguel River Valley about 15 miles north <br />of IvTt?Cla in Nbntrose, County, Colorado. Elevations range from <br />about "aG00 to 5800 feet above sea level. Slopes are steep <br />(30-4081 adjacent to sane of the drainageways but gentle slopes <br />of 2-7~ vL~tr on the divides. Sane southward flawing intermittent <br />drainageway8 Cross the area. The 116-acre tract is gently sloping <br />(2-108) except Los ~ few small ridges and streamside slopes of <br />1C-208. This tract lies at 5672' to 5767' elevation, sloping <br />generally southwestward in the southeast forty and southeastward <br />in the southwest forty toward a small drainageway. <br />• DRASNAGE AND PREVIOUS IRRIGATION <br />Three small waterways cross the tract, one paralleling the stripped <br />area in SW4 SFl; leaving the tract (Map 1) at the extreme south- <br />west ~rner of this forty. The next drainageway passes to the <br />southwest wrner of SE4 S~w3; just east of the ridge which lies <br />across this forty and the forty to the west. The third drain <br />lies just west of this ridge and floras across the southeast part <br />of SW; SW;. None are deeply entrenched, all are crossable by <br />machines and there are ro mappable alluvial depositions. <br />These drains serve as a part of an abandoned and partially dis- <br />rupted irrigation systan, one branch of which enters by a canal <br />flawing southeasterly across the NE4 SW; of Section 25. This feeds <br />three small holding tanks (.06-.15 acres) which lie in a raw in <br />west part of SEa SWa and one which lies just south of the farm <br />house in north center of SWa SW4. The canal is tree-lined from <br />the farm house northeastward for about 1200 feet. A ditch flows <br />westward along the north forty line of SW; SWa and several small <br />