Laserfiche WebLink
Groundwater Monitoring and Mitigation Plan for <br />Heit Aggregate Resource Operation-Weld County <br />Aquatic and Wetland Nursery and Coyle Properties <br />' The goal of the following potential mitigation measures is to: 1) restore groundwater levels to <br />pre-mine conditions, or 2) alleviate a groundwater impact by another means. <br />' 5.1 Construction of Pipe to Equalize Groundwater Levels <br />I Initial calculations indicate that it may be possible to convey groundwater by gravity from the <br />azea of predicted mounding southwest (upgradient) of the proposed pit to the north onto AWC <br />' property where a small lowering of groundwater is predicted. Smooth wall pipe (at least 6 inch <br />diameter) would be needed, and the pipe would have to be cazefully constructed to maintain <br />' adequate slope. <br />' Initial calculations indicate that insufficient slope will exist between the southwest comers of the <br />proposed pit to the Coyle property to permit a gravity pipeline. <br />' 5.2 Deepening of Existing Wells <br />AWC owns several wells that aze reportedly used to irrigate nursery stock (Figure 3). These <br />wells could be deepened or other improvements made (e.g., new pipelines), if necessary, to <br />increase their yield to offset lowered groundwater. Existing wells on the Coyle property could <br />also be improved. <br />5.3 Drilling of New Well(s) <br />A new well or wells could be constructed on AWC and/or the Coyles to provide additional water, <br />if needed. <br />5.4 Delivery of Water from the Meadow Island Ditch <br />The project applicant owns shares in the Meadow Island Ditch, which flows to the west and <br />upgradient of AWC and the Coyles. Water from this ditch could be delivered via new or existing <br />laterals for flood irrigation of either property. <br />021-110.030 Wright Water Engineers, Inc. Page 5 <br />July 2003 <br />