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1999 Annual Hydrologic Report <br />Page 4 <br />for 4 days and subjecting Ceriodaphnia dubia to various dilutions for 2 days. The tests <br />look primarily at mortality during the test period. Data pages SL-3 and SM-3 include <br />summaries of the percent survival at the individual effluent dilution ratios for the Year. <br />Discharge from ouffall 001 and 002 are combined proportional to the total discharge for <br />the previous month to form one sample. The survival rates for all samples taken this <br />Year were in compliance with the discharge permit requirements. <br />Ground Water <br />The ground water monitoring points on Cottonwood and Rapid Creeks were monitored <br />twice during the Year. Results of the monitoring are listed on data page GA-2. <br />Diagrams G99-1 thru 3 show a graphical representation of the depth to water these <br />wells since monitoring began in 1984. Table G99-1 was prepared to show average <br />water levels in the spring and fall to correspond to high and low water levels in the <br />adjacent creeks respectively. <br />Piezometers CRDA-01 thru 06 at the Cameo Refuse Disposal Areas (CRDA) No. 1 and <br />No.2 continued to be monitored quarterly. Data page GC-8 includes measurements for <br />this Year. A graphical representation of the water level elevations in CRDA-01 is shown <br />on Diagram G99-4. Water levels decreased slightly this Year. Most of the original <br />CRDA-# piezometers and the PZ-# piezometers showed only slight variation during the <br />Year. <br />The results of water level measurements at the unit train loadout this Year are listed on <br />Data page GB-1. Diagrams G99-4 and 5 are graphical representations of water level <br />elevations in these piezometers. Table G99-2 was prepared to show statistics on these <br />water levels corresponding to high and low flows in the adjacent river. <br />A former mine dewatering hole (N-1) located at the North Decline area of the mine is <br />now being used to monitor the water level in the abandoned portions of the Roadside <br />South Portal. It is monitored primarily to keep it within a 10' zone between the bottom <br />of the siphon for ouffall 002 and the reclaimed Northwest Intake Portal. The results of <br />monitoring are included in the Mine Water section, Table M99-4. <br />In order to characterize the Rollins Sandstone two surface and two underground wells <br />• were installed during June 1997. The surface wells were installed at the north decline <br />and the unit train loadout. The underground wells were installed in the North and South <br />