Laserfiche WebLink
Second Submittal <br /> Bedrock <br /> The Cretaceous Pierre shale (Pierre)underlies the unconsolidated sands and gravels of the <br /> alluvial aquifer. The Pierre is low permeability marine shale that is considered to be an <br /> aquiclude relative to the overlying alluvium. The groundwater wells and monitoring wells <br /> near the Site are typically screened to the top of the Pierre shale. Utilizing the Colorado <br /> Decision Support System (CDSS) groundwater well database (CDWR, 2017) and Site <br /> monitoring wells, the top of the Pierre shale was inferred as shown in Figure 5. <br /> 2.2.4 Alluvial Aquifer <br /> The primary aquifer is hosted in the shallow alluvium of the Cache la Poudre River. This <br /> alluvial aquifer is recharged by infiltration of up gradient River flows, from storm water <br /> and snowmelt infiltration,irrigation waters applied to the ground surface and seepage from <br /> adjacent irrigation ditches when the ditches are flowing water (usually mid-April through <br /> October). <br /> Domestic and monitoring wells' completed in the alluvial aquifer in the Project vicinity <br /> indicate a saturated thickness of 20 feet or less. Figure 6 shows the thickness of the alluvial <br /> aquifer for Project area. As can be seen in Figure 6, the alluvium varies from 11 to 28 feet <br /> in thickness across the Site. <br /> 2.2.5 Groundwater Flow Patterns <br /> Figure 7 shows groundwater elevations from depth to groundwater measurements in <br /> vicinity wells. Data for Figure 7 were collected by Telesto during monitoring well testing <br /> on site and during the neighborhood water level measurement campaign during early <br /> summer. The groundwater elevations depicted in Figure 7 represent the spring-summer <br /> irrigation season when infiltration of irrigation ditch flows raise the water table. <br /> Groundwater in the Cache la Poudre alluvial system in the vicinity generally flows from <br /> the north and northwest to the south and southeast, paralleling the Cache la Poudre River. <br /> LRM will measure depth to groundwater in the same wells (with owner's permission) <br /> during the winter (i.e., non-irrigation season) when irrigation infiltration, rainfall, and <br /> irrigation ditch flows have ceased allowing the water table to drop. <br /> Loveland Ready-Mix Concrete 8 Telesto Solutions, Inc. <br /> zoisniIzgoundwxr tudy_fidsub-Hala«x Januarv2018 <br />