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2003 Annual Hydrologic Report Page 4 • Discharge point 016 was put into service April 1, 2002. Discharge began April 3, 2002. This gravity discharge point handles all of the water that flows into the sealed South Portal. Since it is a gravity discharge point, the flow discharged will equal the flow into the mine. Table M03-1 presents a summary of the monthly flow from the mine. Data page SV-2 presents a listing of flow and water quality monitoring performed at this site during the Year. Data page SU-2 includes a full suite analysis performed on a sample collected during the Year. The average TDS value at discharge point 016 for the Year was 1,408 mg/I. Whole Effluent Toxicity (WET) tests were continued this Year. The acute test involves subjecting fathead minnows to various dilutions of effluent in receiving water for 4 days and subjecting Ceriodaphnia dubia to various dilutions for 2 days. The tests look primarily at mortality during the test period. Data page SL-5 includes summaries of the percent survival at the individual effluent dilution ratios for the Year. The survival rates for all samples taken this Year were in compliance with the discharge permit requirements. The ground water monitoring points on Cottonwood and Rapid Creeks were monitored twice during the Year, Results of the monitoring are listed on data page GA-2. Diagrams G03-1 thru 3 show a graphical representation of the depth to water for these wells since monitoring began in 1984. Table G03-1 was prepared to show average water levels in the spring and fall to correspond to high and low water levels in the adjacent creeks respectively. Ground Water Piezometers CRDA-01 thru 06 at the Cameo Refuse Disposal Areas (CRDA) No. 1 and No.2 continued to be monitored quarterly. Data page GC-12 includes measurements for this Year. A graphical representation of the water level elevations in CRDA-01 is shown on Diagram G03-4. Water levels decreased during Year. Most of the original CRDA-# piezometers and the PZ-# piezometers showed only slight variation during the Year. The water level in PZ-# piezometers were all below their critical depths. The results of water level measurements at the unit train loadout this Year are listed on Data page GB-2. Diagrams G03-5 and 6 are graphical representations of water level elevations in these piezometers. Table G03-2 was prepared to show statistics on these • water levels corresponding to high and low flows in the adjacent river. Quality information is presented on page GD-13.