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M03086GE <br />1~ <br />i• <br />2.0 SITE CHARACTERISTICS <br />Site characteristics include observed existing and pre-existing <br />site conditions that may influence the geotechnical engineering <br />aspects of the proposed site development. <br />2.1 Site Location <br />The proposed reclamation site is located at the existing Bowie <br />Number 2 Mine about four (4) miles east of Paonia, Colorado. A <br />project vicinity map is presented on Figure 1. <br />2.2 Site Conditions <br />Our scope of services did not include observing the site condi- <br />tions. <br />2.3 Subsurface Conditions <br />Our scope of services did not include a subsurface exploration. <br />Our services included reviewing geotechnical engineering informa- <br />tion obtained from previous studies at the Bowie Number 2 mine. <br />The closest subsurface information from previous studies was our <br />test boring number 10 from our geotechnical engineering study for <br />the proposed conveyor dated October 7, 1998. The soil materials <br />encountered in our test boring number 10 advanced for our geotech- <br />nical engineering report for the conveyor consisted generally of <br />sand, gravel and clay soil mixtures to a depth of about twenty (20) <br />feet, the maximum depth of the test boring. <br />2.4 Calculated Theoretical Slope Stability <br />requested by Mr. Stover. <br />Our slope stability analysis was based on the assumption that the <br />foundation soil materials which support the excavation cut and <br />embankment fill are the same or stronger than the proposed stock- <br />pile fill material. We assumed that formational material would not <br />be encountered in or near the portal bench excavation. We assumed <br />that the soil materials encountered in the test borings for the <br />previous study for the conveyor were consistent with the materials <br />at the proposed portal bench site. These assumptions were as <br />The stability of any slope is dependent on many factors. Typi- <br />cally the stability of a slope is analyzed by calculating the <br />anticipated gravitational forces that tend to drive the mass of <br />soil downhill and the anticipated internal strength of the soil <br />along the expected plane of failure that will resist the downhill <br />lambert anD ~,ooociateo <br />LONSULTRiG GEOTELNNiLAL ENGIH EERS AHD <br />MATERIAL TESTING <br />