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The plots of the historic water levels in the spoil wells are presented on Figures 24, 26, 28, 30, and 31. The <br />water levels normally have a similar pattern to the alluvial wells: they respond rapidly to the spring runoff and <br />then decline rapidly in the summer. Wells 026-SP-I and 026-SP-3 have on occasion been dry by the fall, <br />although this has not happened since 1988. Water levels in these wells closely mirror the pattern of the spoil <br />spring discharges discussed elsewhere in the report. Wells 001-SP-6 and 001-SP-7 reflect fluctuation in the <br />spoil aquifer water table attributable to pumping activities associated with the adjacent Foidel Creek Mine. <br />Water quality data for wells 026-SP-I, 2, and 3 are summarized in Tables 14, I5, and 16 for [he 2000 water <br />year. Tables 14a through ]6a provide period of record statistical summaries of collected water quality data at <br />each site. Figures 25, 27, and 29 provide graphical representations of TDS concentrations recorded at each <br />site. TDS values in all three of these wells are observed to decrease during spring runoff period and increase <br />during the latter part of the water year. <br />Water quality parameters for these sites are typically within previously established ranges with a few exceptions. <br />At site 265P1 (Table 74), new minimum values were recorded for field conductivity, lab pH, bicarbonate, and <br />nitrate. New maximum values were recorded for field conductivity dissolved magnesium, dissolved selenium, <br />nitrite, and ortho-disc phosphate. At site 26SP2 (Table 15), new minimum values were recorded for lab pH <br />and bicarbonate. New maximum values were recorded for sulfate, dissolved selenium, and ortho-diss <br />phosphate. And at site 26SP3 (Table 16), new minimum values were recorded for sulfate and nitrate. New <br />maximum values were recorded for dissolved sodium, dissolved selenium, dissolved manganese, nitrite, and <br />ortho-diss phosphate. <br />In general, the spoil groundwater has comparable TDS concentrations to most of the spoil spring discharge, <br />but much higher values than in the background bedrock ground water. Much of spoil ground water is a <br />calcium-sulfate type with relatively high bicarbonate and low SAR. Spring 114, located just downgradien[ <br />from wells 001-SP-6 and 001-SP-7, typically exhibits higher sodium and sulfate levels than other spoil springs. <br />• The water quality data for spoil wells does no[ indicate any significant changes in trace metals concentrations <br />have occurred over time. <br />SURFACE WATER MONITORING <br />Monitorine(Samnlina Frequency (exceQt as noted): Surface sites monitored under this permit are also monitored <br />under Permit No. C-82-056. Prior to the approval of Perini[ No. C-82-056, TR-35, (May 2000), both permits <br />required 12 flow and field parameter monitoring instances to occur between March and September along with 4 <br />water quality sampling events. In 2000, monitoring/sampling began in the March with exVa monitoring and <br />sampling scheduled through September to provide the required instances. Permit No. C-82-056, TR-35, requires <br />only monthly flow and field parameter monitoring, with only quarterly water quality sample collection. After the <br />approval of TR-35, [he monitoring and sampling schedule was changed [o comply, and the extra <br />moni[oring/sampling was cancelled. As a result, [he 2000 Water Year includes fewer surface water <br />monitoring/sampling instances than normal. Although complying with Petmit No. C-82-056, [his change resulted <br />in missed monitoring/sampling instances for Permit No. C-81-071. <br />Foidel Creek: Four surface flow monitoring sites on Foidel Creek in the vicinity of [he CYCC mined areas and <br />facilities areas are utilized. Site 14 provides data from the undisturbed watershed area adjacent to (northeast <br />of) Eckman Park. Site 800 is located a short distance downstream from Eckman Park below the confluence of <br />the Pond A discharge and site 14 and flows a[ [his station aze monitored by the USGS (Station 09243800). <br />Site 8 is located a short distance downstream of the Foidel Creek mine portal area below Mine 1. And lastly, <br />site 900 is located further downstream above the confluence with Middle Creek. Flows at site 900 are also are <br />. monitored by ttte USGS (Station 09243400). One additional site on Foidel Creek, site 304, required water <br />level tonitoring on a monthly basis in conjunction with alluvial well 008-A V-2. <br />CYCC2000.doc I/3]/Ol <br />