Laserfiche WebLink
<br />additional monitoring sites on Dry Creek at which very limited amounts <br />of Hydrologic data were collected. These two sites called DC-7 and No <br />Name (for lack of a name), are shown on Exhibit A. The data collected <br />from these sites are presented and discussed on pages 7-120, 7-141 and <br />7-142 of the Seneca II-W Mine Permit Application. <br />D. Springs - Flow and Quality <br />As previously discussed in Section II, 46 springs and seeps were <br />initially inventoried in July, 1979. Per agreement with MLRD, those <br />springs highlighted in rectangular boxes on Exhibit 7-7 of the permit <br />application were monitored three times for flow and quality during the <br />summer of 1983. Further monitoring of spring 5-45, also called the <br />Olson Spring, was requested by the MLRD during the technical adequacy <br />review of the permit application. The Olson Spring is water-righted for <br />domestic use and could potentially be impacted by the Seneca II-W Mine <br />operations. In response, spring 5-45 was sampled three times during the <br />summer of 1985 in order to establish baseline conditions. Most <br />recently, as part of the Interim Monitoring Program submitted to the <br />MLRD in early June, 1986, five springs were committed to being monitored <br />annually (September/October) for flow, field parameters and the <br />constituents shown on Table 16. These springs, shown on Exhibit A, are <br />labelled S-1, S-5, 5-23, S-41, and 5-45 and were sampled this past fall <br />(1986) in October. These recenty collected data will be presented in <br />the 1987 AHR. All spring monitoring data collected through 1983 are <br />presented and discussed in the permit application on pages 1-I1 through <br />7-77v. Therefore, only the data collected from spring 5-45 are <br />discussed in this AHR; they are presented in Table 30. Examination of <br />the data reveals that spring 5-45 is a Mg-Ca-SO4 type with a mean TDS <br />concentration of 1,428 mg/1. From the limited data collected to date, <br />the water quality of this site appears to be very similar to that <br />monitored at surface water sites FG1 and SGS; however, the TDS <br />concentration is approximately 40 to 50 percent higher. Finally, <br />although this spring is water-righted for domestic use, it should be <br />pointed out that the level of concentrations for the constituents <br />dissolved Mn and 504 do not meet the Colorado Department of Health's <br />Secondary Drinking Water Standards. <br />107 <br />