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<br />I. <br />I. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3741 <br /> <br />The EPA made no other reference to sal t load ing from natural <br />diffuse sources in specific areas within the basin. Mineral <br />springs in the vicinity of Steamboat Springs contributed 8,800 <br />tons of salt per year. <br /> <br />USGS & BLM - Ground Water Contribution <br /> <br />No data was collected in the Yampa Basin as part of this <br />study. Data collected as part of a 3-year river basin <br />assessment by the USGS (Analysis of Stream Quality in the Yampa <br />River Basin, Colorado and Wyoming - Wentz and Steele, 1980) was <br />used to estimate the base flow salinity contribution of the Yampa <br />River Basin. <br /> <br />It was estimated that approximately 160,000 tons of salt per <br />year were contributed to the Yampa system by ground water <br />inflow. This was 39% of the total average salt yield in the <br />basin for water years 1966-75. Base flow was 50,000 and 110,000 <br />tons per year for the Little Snake tributary and Yampa mainstem, <br />respectively. A relatively large proportion of base flow load <br />from the Little Snake and Yampa mainstem is picked up along the <br />lower and middle reaches where the river channels intersect the <br />Mancos Shale and shales in the Mesa Verde Group. <br /> <br />Summary <br /> <br />Attempts to identify salt loads by source in the Yampa River <br />Basin have been made by the USGS and EPA. The percentage of <br />total salt load attributed to natural and man caused sources does <br />not differ significantly in the two reports. <br /> <br />-9- <br />