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Vermillion Ranch Limited Partnership/Surface Water Impoundment 13659-RX <br /> 3. Seismic stability analysis of the dam foundation soils may be also be required. This <br /> will involve determination of maximum credible earthquake magnitude and peak <br /> ground acceleration through available published information, and estimation of <br /> safety factor against liquefaction and dynamic stability of dam slopes. <br /> Technologies are available to improve the conditions described above, however without further <br /> evaluation it is uncertain whether such improvements are feasible or to the extent that they <br /> ' would be necessary. Accordingly, the recommendations presented in this report are only <br /> preliminary and suitable for use only in preliminary design of the dam until detailed analysis <br /> can be completed. <br /> Scope of Services <br /> The purpose of this study was to explore subsurface conditions at the proposed earthen dam <br /> location, and to provide information on soil bearing capacity, groundwater conditions, potential <br /> settlement and seepage of foundation soils, and other pertinent foundation design <br /> recommendations. <br /> Proiect Information <br /> Project information was provided by Mr. Robert Johnson. It is our understanding the project <br /> will consist of the construction of a earthen dam located in the NE'/4 of Section 18, T.11N., <br /> R.101 W., 6' P.M., Moffat County, Colorado. We understand that the earthen dam will be <br /> approximately 450 feet in length and will be utilized to impound surface water runoff within the <br /> Talamentes Creek drainage system. We understand that exact location,positioning, and dimension <br /> ' of the proposed dam is not known at this time; however, a maximum crest height of 46 feet is <br /> anticipated. <br /> Field Exploration <br /> The field work was performed using a CME 85 truck-mounted drilling rig at the site on <br /> November 18 thru 21, 2008. A total of nine test borings were advanced at the site. Six of the <br /> test borings were advanced along the proposed dam centerline to depths ranging from 26.5 to <br /> 1 80.0 feet. Three of the test borings were advanced at the proposed spillway to depths ranging <br /> from 31.0 to 36.5 feet. Drilling was performed using 4'/4-inch inside diameter, hollow-stem <br /> augers. The augers act as continuously advancing steel casing. The method prevents test holes <br /> from caving in above the levels to be tested. Sampling tools are lowered inside the hollow-stem <br /> for testing into undisturbed soils. <br /> l <br /> Drilling and field sampling were performed according to the following standard specifications: <br /> 1. "Standard Practice for Using Hollow-Stem Augers for Geotechnical Exploration <br /> and Soil Sampling," ASTM D6151. <br /> INBERG-MILLER ENGINEERS 2 February 26, 2009 <br />