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Blue Ribbon Mine - AHR Page 4 <br />METHODS <br />The following outline explains the methods used to perform the current field monitoring: <br />pH - A Cole Parmer pocket-size tester. Range: -1.0 to 15.0 pH. Resolution: 0.1 <br />pH. Accuracy: +/- 0.1 pH. Automatic temperature compensation 0 to 50 °C. <br />Operating temperature: 0 to 50 °C. Up to three point calibration 4.0, 7.0 and <br />10.0. <br />Conductivity -One Cole Parmer TDS Testr 20 pocket size tester. Accuracy: +/- <br />2% FS. Temperature compensation: automatic 0 to 50 °C. Operating <br />temperature: 0 to 50 °C. Ranges: 0 to 0 to 1,900 umhos/cm and 2.0 to 19.90 <br />mmhos/cm. <br />Depth to Water - A Water Level Indicator (M-Scope) is used to measure depth to <br />water. The cable is marked in 5-foot increments. A tape measure is used to <br />determine accurate distances between marked increments. <br />Temperature -One of two methods; 1) a standard mercury thermometer which <br />measures temperature in degrees Celsius or; 2) a microprocessor based <br />temperature tester which measures temperature in both Celsius and Fahrenheit <br />with a 1° accuracy. <br />Flow -One of two methods is used to determine the flow at the surface water <br />monitoring stations. The flow in Hubbard Creek is determined by measuring the <br />depth and velocity of flow in the 10.0 foot diameter culvert at the entrance to the <br />property. This flow value for Hubbard Creek is representative of both upstream <br />and downstream monitoring stations. The flow from the bench underdrains is <br />determined by timing flow into a container of known size. <br />The flow through the 10 foot diameter culvert is calculated by measuring the <br />depth of flow at each end of the culvert. The depth of flow is converted to flow <br />area. The upstream and downstream flow area are averaged and multiplied by <br />the flow velocity. The flow velocity is calculated by determining the time it takes <br />an object to float through the culvert. The calculated flow in Hubbard Creek for <br />the third quarter 1997 was 13.1 cfs. It was calculated as follows: <br />I . <br />Upstream Flow Area (26" Deep) <br />Downstream Flow Area (22" Deep) <br />Average Flow Area <br />Hubbard Creek Velocity (55'= 47 Sec) <br />Hubbard Creek Flow (11.2 X 1.17) <br />12.5 SF (SF=Square Feet) <br />9.9 SF <br />11.2 SF <br />1.17 FPS (FPS =Feet per Second) <br />13.1 CFS (CFS =Cubic Feet per <br />Second) <br />