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Newmont.M CRIPPLE CREEK & VICTOR <br /> PO Box 191 <br /> CRIPPLE CREEK&VICTOR 1 d Street <br /> Victorctor 800 <br /> COC860 <br /> Sample collection from well, stream, pond, reservoir, & waste rock discussed <br /> below. <br /> 8.5. Well Sampling <br /> To begin each sampling event, measure depth, to the nearest one-tenth of a foot, <br /> to static water level from the top of casing (TOC) with a water level indicator <br /> (Solinst). Rinse the level indicator with deionized water (type III reagent grade) <br /> before and after use. <br /> A dry well will be recorded as "Dry at X feet"to assure that the Solinst did not hang <br /> up in the well. <br /> Water standing in a well prior to sampling is not representative of in-situ ground <br /> water quality. Therefore, the stagnant water must be removed and replaced by <br /> • fresh formation water.At CC&V, the standard well sample collection method is the <br /> EPA Low Flow methodology (Low-Flow (minimal drawdown) Ground-water <br /> sampling procedures). <br /> When sampling using EPA Low-Flow methodology, start the pump at low speed <br /> and slowly increase the speed until the discharge occurs. Record the pumping rate <br /> for future sampling and try to match the pumping rate used during previous <br /> sampling events. Otherwise adjust the speed until there is little to no water level <br /> drawdown. If the minimal drawdown exceeds 0.3 feet, but remains stable, <br /> continue purging. Monitor and record the water level and pumping rate at least <br /> every five minutes during purging. Record any pumping rate adjustments (both <br /> time and flow rate). Pumping rates should, as needed, be reduced to the minimum <br /> capabilities of the pump to ensure stabilization of the water level. Adjustments are <br /> best made in the first fifteen minutes of pumping in order to help minimize <br /> purging time. During pump start-up, drawdown may exceed the 0.3 feet target and <br /> then "recover" somewhat as pump flow adjustments are made. Purge volume <br /> calculations should utilize stabilized drawdown value, not the initial drawdown. If <br /> the initial water level is above the top of the screen do not allow the water level to <br /> fall into the well screen.The final purge volume must be greater than the stabilized <br /> • drawdown volume plus the pump's tubing volume. If the drawdown has exceeded <br /> 0.3 feet and stabilizes, calculate the volume of water between the initial water level <br /> Department THIS DOCUMENT IS UNCONTROLLED IN HARD COPY FORMAT Doc Id: <br /> SER Date of This Issue--/--/-- Date of Next Review:--/--/-- Page 23 of 73 <br />