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<br /> <br />MII~iREC, INC. ANNUAL HYDROLOGIC REPORT PAGE S <br />The Colorado Department of Health has implemented regulations regarding saline <br />discharges into the Colorado River. A discharge of one ton of salt per day can be <br />' considered a no-salt discharge by the Department of Health. A flow rate of 100 gpm from <br />with a TDS concentration of 1500 mg/I would yield a salt concentration of 0.9 tons per day, <br />slightly below the one ton per day of salt discharge limitation. The average flow rate for <br />1 the No. 1 Mine was 69 gpm with a TDS concentration of 1409 mg/I during 1998 <br />The entire mine site has been reclaimed and seeded. Good plant growth occurred during <br />1988 through 1998. During 1992 a study was performed at the mine site that <br />demonstrates that untreated drainage from the reclaimed area contributes fewer <br />suspended solids than untreated drainage from the natural surrounding area, (permit <br />' pages 4-19i though 4-19iii). None of the sediment ponds discharged during the year. <br />METHODS <br />' The following narrative explains the methods used to pertorm water monitoring: <br />Flow -Flow is determined at discharge points 001 & 007 by timing flow into a bucket of <br />known volume. <br />pH - A Cole Parmer pocket size tester (pH. Range -1.0 to 15.0 pH). Resolution 0.1 pH. <br />Accuracy +/- 0.1 pH. Operating temperature 0 to 50 °C. Temperature compensation: <br />automatic 0 to 50 °C. <br />Conductivity -One Cole Parmer TDS Testr 20 pocket size tester. Accuracy: +/- 2% FS. <br />Temperature compensation: automatic 0 to 50 °C. Operating temperature: 0 to 50 °C. <br />Ranges: 0 to 0 to 1,900 umhos/cm and 2.0 to 19.90 mmhos/cm. <br />Depth to Water - A Water Level Indicator (M-Scope) is used to measure depth to water. <br />The cable is marked in 5-foot increments. A tape measure is used to determine accurate <br />distances between marked increments. <br />Temperature - A standard mercury thermometer which measures temperature in degrees <br />Celsius or a microprocessor based pocket sized temperature tester is used. <br />' Other parameters -Samples are submitted in bottles to either Grand Junction Laboratories <br />or SOLTESCO. <br /> <br /> <br /> <br />