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2004 Annual Hydrologic Report Page 4 <br />• <br />Whole Effluent Toxicity (WET) tests were continued this Year. The acute test involves <br />subjecting fathead minnows to various dilutions of effluent in receiving water for 4 days and <br />subjecting Ceriodaphnia dubia to various dilutions for 2 days. The tests look primarily at <br />mortality during the test period. Data page SL-5 includes summaries of the percent survival <br />at the individual effluent dilution ratios for the Year. The survival rates for all samples taken <br />this 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 twice <br />during the Year. Results of the monitoring are listed on data page GA-2. Diagrams G04-1 <br />thru 3 shows a graphical representation of the depth to water for these wells since <br />monitoring began in 1984. Table G04-1 was prepared to show average water levels in the <br />spring and fall to correspond to high and low water levels in the 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-13 includes measurements for this <br />• Year. A graphical representation of the water level elevations in the CRDA Piezometers is <br />shown on Diagram G04-4. The water levels in CRDA-01 and CRDA-01A continued to <br />decrease this Year. Piezometers CRDA-02, 03, 04, 05 and 06 have been damp to dry for <br />the past three years (2002 - 2004). The nested PZ-# piezometers showed only slight <br />variation during the Year. The water levels in the PZ-#piezometers were all below their <br />critical depths. A graphical representation of the water levels in the nested piezometers is <br />shown on diagrams G04-7, 8, 9 and 10. <br />The results of water level measurements at the unit train loadout this Year are listed on Data <br />page GB-2. Diagrams G04-5 and 6 are graphical representations of water level elevations in <br />these piezometers. Table G04-2 was prepared to show statistics on these water levels <br />corresponding to high and low flows in the adjacent river. Quality information is presented on <br />page GD-13. <br />A former mine dewatering hole (N-1) located at the North Decline area of the mine is used to <br />monitor the water level in the abandoned portions of the Roadside South Portal. Since <br />discharge point 016 was put into service, the water level in N-1 is virtually constant and it is <br />expected to stay at an elevation of about 4758. The results of monitoring N-1 are presented <br />in Table M04-2. <br />• In order to characterize the Rollins Sandstone two surface and two underground wells were <br />installed during June 1997. The surface wells were installed at the north decline and the unit <br />train loadout. The underground wells were installed in the North and South Portals. Depth <br />