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• 2000 Annual Hydrologic Report Page 3 diameter pipe is presented on permit Figure 14-6. The capacity of this discharge pipe is about 75 gpm. Data page SD-14 presents the results of weekly monitoring on Outfall 001. The 2000 full suite water analysis results are shown on data page SN-7. Discharge point 002 is water siphoned from the reclaimed Northwest Intake Portal at the Roadside South Portals. Mine inflows that were not pumped to the preparation plant were routed to an abandoned portion of the mine for discharge from this point. The preparation plant was shut down during December 1999 so all mine inflows in excess of those handled by outfall 001, flow north to the lower portion of the mine where they are handled by the siphon, outfall 002. Data page SE-9 presents a listing of water quality monitoring performed at this site during the Year. Data page SO-7 includes a full suite analysis performed on a sample collected during 2000. The average TDS was about the same as last year. The following table presents the average TDS measurements for outfall 002 for the last four water years. Average TDS from Pages SE-6 -~ SE-9 Water Year 1997 1998 1999 2000 TDS (mg/I) 1683 1674 1558 1560 Discharge point 004, discharge from the Roadside North Portal, only had flow through December 15, 1999. It is unlikely this discharge point will have any further discharge since the North Portal was sealed on February 10, 2000. A listing of weekly monitoring results is given on data page SF-18. No full suite analysis on outfall 004 was performed this year since there was only discharge during the period October, November and December 1999. 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 pages SL-3 and SM-3 include summaries of the percent survival at the individual effluent dilution ratios for the Year. Discharge from outfall 001 and 002 are combined proportional to the total discharge for the previous month to form one sample. The survival rates for all samples taken this Year were in compliance with the discharge permit requirements.