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Mayo and Assotla/es, LC <br />• 5.0 SPRING DISCHARGE CHARACTERISTICS <br />Since 1978, discharge rate data have been collected from 83 springs and one mine adit. Most <br />of these springs are part of series of springs designated with one of the following prefixes: <br />numeric, D, F, G, J, and WCC. Forty-five of the springs were only monitored between 1978 <br />and the mid-1980's including most of the D, many of the G, most of the J and many of the <br />WCC series springs. Thirty-nine of the locations are part of the current monitoring program. <br />Hydrographs of the spring discharges are included in Appendix C. <br />Although the number of monitored bedrock springs is only slightly less than the number of <br />monitored springs issuing from superficial sediments, most of the volume of spring <br />• discharges is from superficial sediments (Figure 9). In this context, superficial sediment <br />means those sediments that have a limited thickness and are generally considered to be <br />unconsolidated (i.e. alluvial, mantle cover, and landslide deposits). In Figure 9, cumulative <br />discharges are based on the sum of the maximutu and minimum recorded discharge rates for <br />each spring. Superficial systems springs account for 65% of the cumulative discharge and <br />the total of landslide springs accounts for 42% of [lie cumulative discharge. Barren Member <br />springs only account for 25% and the Upper- and Lower Coal Member springs account for <br />only 5% of the cumulative discharge. All other sources account for only 5% of the <br />cumulative discharge. No springs are known to exist in the Rollins Sandstone. <br />Hydrographs for each spring that has had a measurable discharge rate, show a response [o <br />. seasonal recharge effects. Although springtime discharge rates have been recorded as great <br />Characterization of Groundwater Systems in the Vicinity oC the west Elk Mine, Somerset, Colorado <br />29 January 1999 <br />Page 56 <br />