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PLAN TO COLLECT, RECORD AND REPORT SURFACE AND GROUND WATER MONITORING DATA <br />SURFACE WATER MONITORING <br />1. A weather station recording temperature, barometric pressure and precipitation <br />will be installed at the mine office. Any precipitation amounts will be <br />recorded so that they can be compared with the performance of all the hydro- <br />logic structures at the mine site. <br />2. A crest-stage recorder will be established in the permanent diversion just <br />above the point that the diversion leaves the permit area. Accurate cross <br />sectional area and slope measurements will be made at this point. Using <br />this information, an approximation of the peak flow in the diversion will <br />be made for each major rainfall event. Readings will be made for each signi- <br />ficant runoff event. Quality determinations will be made of the flows not <br />less than once every 3 months, provided that an adequate runoff event occurs. <br />Quarterly reports will be sent to the Division. <br />3. A rectangular opening weir box will be installed at the discharge of the <br />sediment pond dewatering pipe. The weir opening will be 2.5 feet wide and <br />8 inches high, which will measure a flow of 1.3 cfs, more than the maximum <br />through the 4 inch dewatering pipe. Quantity measurements will be made for <br />each discharge event and quality measurements will be made according to the <br />requirements of the NPDES permit, Ouarterly reports will be submitted to <br />the Division identifying all measurements taken during the quarter and a <br />copy of all analysis and reports sent to the Colorado Department of Health <br />regarding the NPDES permit. <br />A calibrated rod will be installed in the sediment pond to record the level <br />of the pond after runoff events, and also to compare the outflow through the <br />dewatering pipe with the head of the water in the pond. This information <br />will also be included with the quarterly reports sent to the Division. <br />D. H. EMLING COMPANY <br />