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trans-mountain diversions form the bulk of the water sources for these uses in urban areas <br /> along the Front Range. Local groundwater flow and levels are strongly controlled by the <br /> Cache la Poudre River, irrigation ditches, and agricultural irrigation. <br /> At the Site, the Cretaceous Pierre Shale (Pierre) underlies the unconsolidated sands and <br /> gravels of the alluvial aquifer. The Pierre is low permeability marine shale acting as an <br /> aquiclude between underlying bedrock aquifers and the overlying alluvium. Utilizing the <br /> Colorado Decision Support System (CDSS) groundwater well database (CDWR, 2017) <br /> and Site monitoring wells, Telesto inferred the top of the Pierre Shale (Figure 4). <br /> The aquifer of primary importance at the site is hosted in the shallow alluvium of the Cache <br /> la Poudre River. This alluvial aquifer is recharged by infiltration of up gradient river flows, <br /> from storm water and snowmelt infiltration, irrigation waters applied to the ground surface <br /> and seepage from adjacent irrigation ditches when the ditches are flowing water (usually <br /> mid-April through October). Domestic and monitoring wells completed in the alluvial <br /> aquifer near the Site indicate a saturated thickness of 20 feet or less. Figure 5 displays the <br /> alluvium's thickness and indicates that across the Site, the thickness varies from 11 to 28 <br /> feet. <br /> Figure 6 depicts the groundwater elevations and general flow directions of alluvial <br /> groundwater near the Site. Telesto generated Figure 6 from on-site and neighborhood <br /> water level measurements during July 2019. Groundwater in the Cache la Poudre alluvial <br /> system in the vicinity generally flows from the north and northwest to the south and <br /> southeast, paralleling the Cache la Poudre River. Telesto (2017) provides additional, <br /> detailed information on the alluvial aquifer characteristics. <br /> 1.2.3 Groundwater Quality <br /> Flynn (2003) provides a thorough description of regional water quality from shallow <br /> aquifers throughout Colorado's Front Range urban corridor,which is summarized in Table <br /> 1. Generally, regional water quality is variable and dependent on the underlying geology, <br /> local land use agricultural activities, and recharge dynamics. Generally, pH is <br /> Loveland Ready-Mix Concrete 3 December 2019 <br /> ,0,00aa� .m„_basc�,ne„a«rqualA>> naw. T E L E S T O <br />