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Newmont.. CRIPPLE CREEK & VICTOR <br /> PO Box191 <br /> CRIPPLE CREEK&VICTOR <br /> t00N.3'd5treet <br /> Victor CO 80860 <br /> 1. The method that is being used is the .4 method, or the 60% method. <br /> 2. Upon arrival at field location perform field level risk assessment to determine <br /> location is safe to perform surface water sampling. Document risk assessment <br /> with field level risk assessment form, and record image with field equipment <br /> to be uploaded to Monitor Pro 5. <br /> 3. Measure the width of the channel. <br /> 4. Divide the width of the channel into a number of equal segments (more <br /> segments increases the accuracy of the resultant flow). If the difference in <br /> mean velocity between two adjacent segments is greater than 10%, the <br /> segments should be smaller. <br /> 5. Work from the downstream side of the tape beginning on the bank side of the <br /> stream, putting the Top-Setting Wading rod into the stream. Set the depth on <br /> the wading staff's sliding rod lock to the depth of the water which is read at <br /> the bottom of the rod. <br /> 6. Record the velocity and depth measurements. <br /> • 7. Proceed to the next segments and make the depth measurement adjustment <br /> 8. Record the segment units used .5 ft., 1 ft., etc. then record the depth for that <br /> segment. <br /> Flow is calculated with the continuity equation (Q= a x A) <br /> Whereas Q is flow, a is mean velocity and A is cross-sectional area. The flow of the <br /> channel is the sum of all segment areas times the mean velocity across the channel. <br /> Remember to account for the bank measurements. <br /> Surface Water Sampling Procedure <br /> 1. Prior to leaving office turn on and calibrate YSI Pro plus water quality meter, <br /> record in calibration log the pH buffer values, DO calibration value, and <br /> Specific Conductance Calibration Values (See YSI Calibration SOP). <br /> 2. Upon arrival at field location perform field level risk assessment to determine <br /> location is safe to perform surface water sampling. Document risk assessment <br /> with field level risk assessment form, and record image with field equipment <br /> to be uploaded to Monitor Pro 5. <br /> 3. When at sampling location, place YSI probe directly in stream, allow <br /> • parameters to stabilized and record parameters. <br /> 4. If using Myron Ultrameter, submerge sample vessel to mid-depth on the <br /> Department THIS DOCUMENT IS UNCONTROLLED IN HARD COPY FORMAT Doc Id: <br /> SIIR Date of This Issue--/--/-- Date of Next Review:--/--/-- Page 54 of 73 <br />