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October 20, 2003. <br />Recommended Placement of Groundwater Observation Wells <br />Haldorson Gravel Mine <br />Don R. May, PE, PhD <br />Phase 1 <br />groundwater <br />flow <br />1 <br />Schematic -not in schale <br />Observation Wells <br />• Existing <br />® Phase 1 <br />O Future phases (tentative) <br />Explanation <br />All indications are that the flow of groundwater is this area is from SW to NE. Observation wells <br />should be placed so that there is the greatest likelihood that they will be along flow lines. I would <br />recommend the pattern of six wells as shown around phase 1 to achieve this objective. <br />The remaining observation wells should provide more than adequate coverage to understand the <br />effect of the pit on regional groundwater flow. As the excavation moves south and a greater <br />understanding of the groundwater condition is gained, through the monitoring program, there is less <br />and less need for the south monitoring well located on the interior of the site. <br />Placement of wells surrounding future phases could be constructed now, however I think it would be <br />prudent to wait until data has been collected on phase 1. This data may suggest a different <br />configuration and/or a different number of wells. <br />