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• Tables 18 through 22 provide summaries of [he 1998 Water Year data collected a[ each site. Tables 18a <br />through 21a provide period of record statistical summaries of collected data at specified sites. Table 22a <br />provides a water level summary for site 304. Figures 32 t}trough 47 provide graphical representations of flow <br />rates and selected water quality parameters recorded at each site. Typical flow panems were exhibited at these <br />sites with spring runoff periods accounting for the peak flows observed. Runoff magnitudes were down during <br />2000 based upon comparison with recent years data. At all of these sites, the inverse relationship between <br />flow and field conductivity continues to be evident. <br />Water quality parameters for these sites are typically within previously established ranges with a few exceptions. <br />A[ site 800 (Table 20), new maximum values were recorded for lab conductivity and total recoverable iron. At <br />site 900 (Table 21), new maximum vales were recorded for lab pH and carbonate. <br />The base level of field conductivity measured during the fall continues to be higher in the downstream sites on <br />Foidel Creek. Since the sharp rise in 1986, the conductivity at both downstream sites has leveled off. The <br />upstream site reflects a notable conductivity increase since over the last three years. <br />The difference between the conductivities at the upstream and downstream stations is attributable primarily to <br />spoil spring discharges related to surface mining. These discharges cause increased concentrations of TDS, <br />calcium, magnesium, and sulfate and a reduction in SAR in Foidel Creek. However, the increase in TDS <br />levels during irrigation season is not sufficient to cause material damage. While the spoil spriiigs are adding <br />some manganese to Foidel Creek, the level at Station 8 is still below the total recoverable standard of 1000 ug/I <br />for Foidel Creek. Historically, high total recoverable manganese also has been recorded in the upstream <br />station (14), indicating that these values may in some instances be attributable [o non-mining related causes. <br />Middle Creek: Middle Creek downstream of Mine 1 is monitored for flow and water quality at one location <br />under the CYCC monitoring program. USGS Site 09243700, also known as site 700, is located on Middle <br />Creek approximately one mile upstream of the confluence of Foidel and Middle Creeks (see Figure 2). The <br />• USGS maintains a continuous recorder a[ site 700 and provides data summaries to CYCC. <br />Table 23 provides a summary of the 2000 Water Year data collected at Middle Creek surface flaw site 700. <br />Table 23a provides the period of record statistical summary of collected data at the site. Table 23b provides a <br />historical summary of flow rate data for [he site. Figures 48 through 50 provide graphical representations of <br />water levels and field conductivity data recorded at the site. Again, the typical flow pattern was exhibited at <br />this site with [he spring runoff period accounting for the peak flow observed. Runoff magnitude was about <br />average during 2000, though down when compared to recent previous years data. The inverse relationship <br />between flow and field conductivity was generally evident at this location. All monitored water quality <br />parameters for surface water site 700 were observed to fall within previously established ranges for [he 2000 <br />Water Year. <br />Fish Creek: Three surface flow monitoring sites on Fish Creek are utilized. Site 16 is located upstream of the <br />Mine 2 area; site 302 is located downstream of the Fish Creel $orehole mine dewa[ering site; and site 1002 is <br />located approximately 2 miles further downstream and is monitored in conjunction with alluvial well 006-AW- <br />2. One additional site, 307, is monitored for water levels only in conjunction with alluvial well 006-AZ-3. <br />Station 16 replaced Station 1001 that was located upstream of where Fish Creek enters Twentymile Park. <br />Tables 24 through 27 provide summaries of the 2000 Water Year data collected at Fish Creek surface flow <br />sites. Tables 24a, 25a, and 27a provide period of record statistical summaries of collected data a[ each site. <br />Tables 24b, 25b, and 27b provide period of record flow rate summaries for the associated sites. Table 26a <br />provides the water level summary for site 307. Figures 51 through 55 provide graphical representations of <br />water levels and selected water quality parameters recorded at each site. Again, typical flow panems were <br />exhibited at these sites with spring runoff periods accounting for the peak flows observed. Runoff magnitudes <br />were average during 2000 based upon comparison with previous years data and peak flaw estimates were in <br />some instances derived from [he high end of the rating curves developed for each site. These values represent <br />best estimates but are unsubstantiated with measured data. <br />CYCC2000.doc ]/31/01 5 <br />