Laserfiche WebLink
Groundwater Monitoring & Response Plan <br />2.0 WATER WELL INVENTORY AND ASSESSMENT <br />An inventory and assessment of vicinity wells will be conducted in advance of dewatering <br />activities. The inventory will be conducted to verify existing well locations and construction <br />information for wells located within the projected area where the groundwater model forecasts <br />drawdowns of 5 feet or greater at maximum build -out of the Pit. Well construction information <br />will include but not necessarily be limited to, well depth, pump set depth, static water level during <br />baseflow conditions, and drawdown responses to pumping. The well inventory and assessment <br />will be conducted by 1) reviewing existing state well records, 2) contacting the land owners to <br />gain permission to access and locate their wells, 3) verifying the locations of the wells, and 4) <br />verifying well construction information and static water level conditions where possible. The <br />wells will then be assessed for potential impacts by comparing the verified well construction <br />information to the forecasted drawdowns from the WWL numerical groundwater model. Results <br />of the well inventory and assessment task will be used to update this Plan as appropriate. <br />3.0 WATER LEVEL MONITORING PROGRAM <br />The water level monitoring program will provide the data to document water level responses to <br />dewatering operations and protect the surrounding water well users from detrimental impacts <br />resulting from water level declines. Ultimately, the data will be used to more accurately forecast <br />and respond to projected and observed water level responses. The monitoring program will <br />consist of monitoring groundwater levels in the vicinity of the Pit by measuring and recording <br />water levels in a network of monitoring wells. In addition, surface water levels in the Animas <br />River will be monitored upstream and downstream of the Pit. The surface water monitoring data <br />will provide supplemental input to the numerical model and will be used to refine model <br />calibration and improve the reliability of model predictions. <br />3.1 Monitoring Network <br />The proposed monitoring well network includes one existing water well and four new monitoring <br />wells to be installed by Elam (Figure 2). The one existing well is owned by Mr. Mark McGarry <br />(referred to herein as the "McGarry Well ") and is the closest existing well to the Pit. The <br />McGarry Well is permitted as an exempt well (Well Permit No. 244426A), with a maximum <br />pumping rate of 15 gallons per minute (gpm) and uses limited to fire protection, ordinary <br />household purposes inside not more than 3 single family dwellings, the irrigation of not more <br />Western Water & Land, Inc. 3 <br />