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Groundwater Evaluation For Proposed Heit Aggregate Operation <br />Weld County, Colorado <br />A nursery owned and operated by AWC exists in Section 13 immediately north of the Heit <br />Property. Two water supply wells are associated with the nursery: Permit No. 55792-F is a <br />shallow well with a reported yield of 20 gallons per minute (gpm), which is located a distance <br />north of the proposed pit; Permit No. 50354-F is for a higher yielding well (250 gpm) that is <br />located immediately north of the proposed mine (Drawing 1). The focus of this investigation is <br />on the latter well due to its proximity to the pit and higher permitted yield. The owner of the <br />wells has expressed concerns with possible impacts from mining of the Heit pit. The <br />characteristics of the two wells are shown in Table 1, and the locations of the wells are indicated <br />on Drawing 1. <br />Most of the subject property (and the area proposed for mining) consists of a flat, fallow <br />agricultural field. An area of native vegetation exists on a terrace on the west portion of the <br />property where the Lupton Meadows Ditch is located. This terrace is two to three feet lower in <br />elevation than the agricultural field immediately to the east. Based on field observations, <br />wetlands exist in portions of this lower terrace. <br />According to the Soil Survey Weld County, Southern Part (SCS 1980), the agricultural field <br />consists of Altvan loam and Dacono clay loam. Altvan loam is described as a deep, well drained <br />soil on terraces of old alluvium. Dacono clay loam is described as a deep, well drained soil <br />formed from mixed alluvium. The soil on the western portion of the property where the <br />irrigation ditches are located is Aquolls and Aquents, which aze deep, poorly drained soils <br />formed in alluvium with a hig11 water table. This mapping unit may support wetlands. <br />The Geologic Map of the Platteville Quadrangle, Weld County, Colorado (Soister 1965) shows <br />the site as being underlain by the alluvium of the South Platte River. The property is included in <br />the area addressed in the study Hydrogeologic Characteristics of the Valley-Fill Aquifer in the <br />Brighton Reach of the South Platte River Valley, Colorado (Hurt, et al 1972) which shows the <br />saturated thickness of the alluvium to be around 30 feet. This report identifies the direction of <br />alluvial groundwater flow to be to the north/northeast in the study area. <br />021-110.030 Wright Water Engineers, Inc. Page 2 <br />March 2003 <br />