Laserfiche WebLink
1 <br />lJ <br /> <br /> <br />1 <br /> <br />1 <br />1 <br />1. <br />1. SUMMARY <br />1. Piteau & Associates was contracted by Chimney Rock Coal Company <br />to perform aquifer testing of the Stollsteimer Creek alluvium <br />and Fruitland Formation bedrock at the Martinez Strip near <br />Pagosa Springs, Colorado. Upon completion of the testing and <br />evaluation of the test data, this study determined current and <br />projected inflows to the active and proposed Barren Ridge pits <br />and a determination of the effects of mining on water chemistry. <br />2. A step drawdown test was conducted at Well W-15. Evaluation of <br />test data indicates a transmissivity value for the Stollsteimer <br />Creek alluvium of approximately 100,000 gpd/f t. <br />A 24 hour drawdown/recovery constant discharge test was con- <br />ducted at Well W-9 along the Barren Ridge area. Water level <br />changes were monitored in the pumped well and at observation <br />Well W-10. Evaluation of the test data indicates representative <br />transmissivity and storativity values of 210 gpd/ft and <br />1.3x10-4 respectively, for the Fruitland Formation. <br />4. Computer simulation of the constant discharge test indicated a <br />' representative value for transmissivity of 130 gpd/ft and stora- <br />tivity of 1.3x10-4. The computer program utilizes the Theis <br />equation. <br /> <br />1 <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br />An estimation of pit inflows using hydrogeologic data and com- <br />puter analysis was performed. Representative_v_alues for inflow <br />to the active pit area and the proposed Barren Ridge area are TO <br />and-0:68 gpm, respectively. <br />~~~~~\ <br />1 e<<e <br />1 <br />