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• <br />2002 Annual Hydrologic Report Page 4 <br />Average TDS from Pages SE-8 -~ SE-11 <br />Water Year 1999 2000 2001 2002 <br />TDS (mg/I) 1558 1560 1500 1500 <br />Discharge point 004 had a minor discharge when a crack developed in the bottom of <br />Pond 12 and some drilling water flowed out of the pond. Data page SF-19 presents a <br />listing of flow and water quality monitoring performed at this site during the Year. This <br />discharge point will not have any further discharge since pond 12 has been reclaimed <br />and the North Portal was sealed during February 2000. <br />Discharge point 016 was put into service April 1, 2002. Discharge began April 3, 2002. <br />This gravity discharge point handles all of the water that flows into the sealed South <br />Portal. Since it is a gravity discharge point, the flow discharged will equal the flow into <br />the mine. Data page SV-1 presents a listing of flow and water quality monitoring <br />performed at this site during the Year. Data page SU-1 includes a full suite analysis <br />performed on a sample collected during the Year. The average TDS value at discharge <br />• point 016 for the period April 2002 through September 2002 was 1,516 mg/I which is <br />virtually identical to discharge point 002. <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 <br />and subjecting Ceriodaphnia dubia to various dilutions for 2 days. The tests look <br />primarily at mortality during the test period. Data pages SL-4 & SL-5 include <br />summaries of the percent survival at the individual effuent dilution ratios for the Year. <br />Discharge from outfall 001 and 002 were combined proportional to the total discharge <br />for 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 G02-1 thru 3 show a graphical representation of the depth to water for these <br />wells since monitoring began in 1984. Table G02-1 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 />