Laserfiche WebLink
• DRILLING AND TESTING REPORT FOR <br />GROUND WATER MONITORING AT <br />THE NORTH THOMPSON CREEK MINE, <br />PITKIN COUNTY, COLORADO <br />INTRODUCTION <br />four bedrock ground water monitoring holes were drilled in the vici- <br />nity of the North Thompson Creek Mine during the period of April 17 <br />through May 8, 1980. One of these four holes was plugged and aban- <br />doned after considerable difficulty in completing the hole as planned, <br />due to excessive artesian pressure and flow. The three completed <br />holes were tested and sampled during the period of May 8 through May <br />14, 1980. In addition to these three holes, two alluvial refuse area <br />monitoring holes were tested. <br />• The drilling was done by the Golden Eagle Drilling Company of Frisco, <br />Colorado, using a Speedstar SS-15 II Air-Rotary drilling rig. Since <br />all drilling was performed with either air or air-mist, the lithology <br />and hydrology were easily observed during drilling. All holes were <br />drilled with a 7-7/8" bit to a shallow depth to set a steel surface <br />casing and a 6-1/2" bit to total depth. <br />Testing was performed by either pumping water from the hole at a <br />constant rate and measuring drawdown and/or recovery of the water <br />level, or by injecting a slug of known volume and measuring residual <br />head at discrete time intervals. <br />L~ <br />