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<br />Lake San Cristobal, in Hinsdale County, has been identified as being impacted <br /> <br />by sediments containing metals from the Slumgullion Slide, a natural geologic <br />.' t\J <br />0] ~feature which has been aggravated byroad construction and lakefront <br />',{\~A <br />~developmel1t . <br /> <br />Local reports 'of impacts to aquatic life in both Lake San <br /> <br />F~ <br />....,':. <br /> <br />Cristobal and downstream in the Lake Fork of the Gunn.ison lliverrequire both. <br /> <br />/t.,., <br />~;'_.~ <br />t~~" <br /> <br />. <br />chemical and biological monitoring to substantiate the identified. problems. <br /> <br />The East Fork of the Mancos River has been identified by the U.S. Forest <br /> <br />L1:;, <br />t~~1 <br /> <br />Service as being impacted by inactive mining. Initial monitoring by the <br /> <br />Forest Service indicate that heavy metals are affecting aquatic life in the <br /> <br />~~1~ <br />':u.; <br />!.~~:.;; <br /> <br />East Fork. Additional monitoring to locate the sources of the loading and <br /> <br />impacts to aquatic life are recommended. <br /> <br />:.~; " <br /> <br />""J <br />~:\; <br /> <br />Groundwater Impacts From Nonpoint Sources <br /> <br />L:! <br /> <br />".". <br /> <br />,. <br /> <br />P;'/l <br />~~~J <br /> <br />The 1988 Colorado Nonpoint Assessment Report identified the lack of <br /> <br />groundwater quality data as a defiCiency which prevented a thorough assessment <br /> <br />~:; <br /> <br />of nonpoint impacts to this valuable water resource. In an effor.t to improve <br /> <br />the data base for groundwater quality, several steps have been taken since the <br /> <br />.t~{~~ <br />0:'-:~ <br /> <br />1988 report was produced. <br /> <br />i;i! <br /> <br />First, a groundwater monitoring work group, comprised of many local, state and <br /> <br />federal agencies involved in groundwater quality and data collection, has been <br /> <br />formed to study how groundwater monitoring should be conducted. The work <br /> <br /> <br />group has evaluated existing groundwater information, data deficiencies, and <br /> <br />procedures for analyzing and storing groundwater data. It is anticipated that <br /> <br />the outcome of this effort will be standardized protocols for groundwater <br /> <br />collection and a centralized groundwater data base for Colorado. <br /> <br />-6- <br /> <br /> <br />,-. <br />