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' ~ ~ $rightou Water Storage Project ~ ~ • <br />-' - Slope StabiliTy Calculations <br />' Adams County, Colorado <br />As discussed above, GROUND recommends that temporary, excavation slopes be cut no steeper <br />than 1%:1 (horizontal :vertical) in the native soils and bedrock in the absence of seepage. Somo <br />surficial sloughing and local failures may occur on slope faces, cut at this angle. Significant , <br />'. erosion should be anticipated during major rainfall events. Stockpiling of materials should not be <br /> <br />i~ <br />permitted closer to the tops of temporary slopes than 30 feet. <br />Good surface drainage should be provided around temporary excavation slopes to direct surface, <br />runoff away from~the slope faces. A properly designed drainage Swale should be provided at the <br />top of the excavations. In no case should water be,allowed to pond at the site near the slopes. <br />.Excavations in which personnel will be working must comply with all OSHA Standards and <br />Regulations particularly CFR 29 Part 1926, .OSHA Standards-Excavations, adopted March 5, <br />' 1990. <br />Closure _ - <br />' This report has been prepared for Les Ewegen, LLC, as it pertains to preliminary design of the <br />' subject water storage project as described herein.. It may not contain sufficient information for <br />other parties or other purposes. In addition, GROiJND has assumed that project construction will <br />' commence by Summer, 2003. ,Changes in project plans or schedule should be brought to the <br />attention of the Geotechnical Engineer, in order that the geotechnical recommendations may be <br />re-evaluated and, as necessary, modified. ~ ~ _ <br />' The geotechnical conclusions and recommendations in this report relied upon subsurface <br />t exploration at a limited number of exploration points, as shown on Figure 1. Subsurface <br />conditions were interpolated between and extrapolated beyond these locations. Findings were <br />dependent on the'Iimited amount of direct evidence obtained at the time of this geotechnical <br />' ~ evaluation. Our recommendations were developed for site conditions as described above. Actual <br />conditions exposed during construction may be anticipated to differ, somewhat, from those <br />' encountered during site exploration. If duffing construction, surface, soil, bedrock, or <br />groundwater conditions appear to be at variance with those described herein, the Geotechriical <br />t ~ Engineer should be advised at once, so that re-evaluation of the recomtendations may be made <br />in a timely manner. <br />~, This report was prepared in accordance with generally accepted soil and foundation engineering <br />practice in the.Adams County, Colorado, area, at the date of preparation. GROLiND makes no <br />' - <br />' - _ lob No. 02-0065 ` Ground Engineering Consultants, Inc: Page 9 <br />