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Huddleston -Berry <br />s s ro iw ILC <br />1.3 Proposed Development <br />P P <br />As discussed previously, the proposed development includes mining of gravel <br />resources in the western portion of the site. In addition, two small detention ponds are <br />proposed to collect stormwater from the small drainages which cross the site. The <br />proposed site development is included as Figure 2 — Mining Plan. <br />2.0 GEOLOGIC SETTING f <br />2.1 Soils <br />Soils data was obtained from the USDA Natural resource Conservation Service <br />Web Soil Survey. The data indicates that the soils at the site consist of the Northrim- <br />Garber-Trag complex, 3 to 25 percent slopes, very stony. Soil survey data, including a <br />description of the soil unit, is included in Appendix A. <br />2.2 Geology <br />C According to the Geologic Map of Colorado by Ogden Tweto (1979), the site is <br />underlain by Modern Alluvium. The alluvium is shown as being underlain by biotitic <br />t gneiss, schist, and migmatite or granitic rocks of 1,400 and 1,700 MY age groups. In <br />addition, the geologic map indicates that an anticline is located near the site to the east <br />and a fault is located near the site to the west. <br />2.3 Groundwater <br />Groundwater was not observed in the bottom of the existing mine area. In <br />addition, no seeps were observed along the cut slopes above Highway 141 or the fill <br />slopes below Highway 141. However, West Creek was observed to flow near the base of <br />the embankment south of Highway 141 and it is likely that West Creek reflects the <br />approximate local groundwater elevation. <br />3.0 FIELD RECONNAISSANCE <br />The field reconnaissance included walking the site. In general, no evidence of <br />landslides, debris flows, rockfalls, etc. was observed. In addition, the steep cut slopes on <br />the north side of Highway 141 were observed to be stable. However, several small <br />drainages were observed to cross the site and two of these completely crossed the site and <br />discharged into culverts below Highway 141. The drainages were dry at the time of the <br />reconnaissance. <br />4.0 GEOLOGIC INTERPRETATION <br />4.1 Geologic Hazards <br />The only potential geologic hazard at the site is the possibility of failure of steep <br />slopes along Highway 141 and/or steep slopes inside of the gravel pit. Slope stability <br />will be discussed further in a later section of this report. <br />WA2008 ALL PROJECTS \00966 - Moores Mining, LLC \00966 -0001 Moores Pit\200 - Oeo \00966 -0001 R030310.doe 2 <br />