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Ju~~ 1999 Sorera Caul Comparry ' Yaa.r! aline Srdimenlarion Pond 073 Slaln'Gry Ana}+++ 13 <br />C I <br />2.0 RESULTS <br />The following results were realized using the input data described: <br />TABLE 4 <br />STABILITY RESULTS <br />EMBANKMENTMATERWL BASED9ATERIAL BISHOPF05 <br />Sand Cla Sliehd Sand Clav 1.94 <br />As described under Rule 4.05.6 (I I) (k), all surface water impoundment swctures must be conswcted <br />with a SF not less than 1.3. As shown in Table 4, Sedimentation Pond 013 will meet the criteria for <br />stability. In order to ensure the embankment is constructed within these parameters, the following <br />recommendations have been presented. <br />3.0 RECOMMENDATIONS <br />• <br />In order to achieve the design parameters, it is recommended that the following procedures be utilized in <br />the construction of the sedimentation pond embankrttents: <br />1.) Upon clearing topsoil and non-engineered fill materials, and construction of embankment <br />key-way, have Registered Eneineer verify subgrade material classification in association <br />with this stability report. <br />2.) Also, have Registered Engineer verify embankment fill progenies prior [o consvuction. <br />3.) Construct embankment in maximum 1-foot horizontal lifts. <br />4.) Compact each individual lift to 9590 of standard proctor using available equipment. <br />5.) Maintain upstream and downstream slopes no steeper than 3H:1 V. <br />4.0 REFERENCES <br />CJ <br />Huang, Yang H. (1983). Stnbilirv Ana/ysis of Enrth Slopes. University of Kentucky. Van Nostrand <br />Reinhold Company, New York, NY. <br />Leidich, Tom (1999). Proposed Pond 012 Design. £.r![ibit 13-12.2, Yoast Permit. Prepared for Seneca <br />Coal Company. <br />NCRS (1999 draft). Soil Serve}~ for Rmrrr Counn~. NCRS. Craig, Colorado. <br />Northwest Colorado Consultants (July. 1994). "Geotechnical Invesrigarion. Haalronds Y-A & Y-B and <br />Sedimeruarion Pond 0/0, Yoasr Mine Area, Rourt Counn~, Colorado". Prepared for Seneca Coal <br />Company. <br />Northwest Colorado Consultants (August, 1996). "Geotechnicnl hrvestigarior/Summnn• Report Pond 010 <br />Embankment -Permit C-94-082 Yoasr Mine. Roust Counn~, Colorndo'". Prepared for Seneca Coal <br />Company. <br />Nyenhuis, Jim (1993-a). Yoasr Mine Resenrch Soil Analysis. CSU Soil Testing Laboratory. Performed for <br />Seneca Coal Company. <br />Nyenhuis, ]im (1993-b). "Soil Types and Soil Salvage Map". Esitibit 9-/, Yoast Permit. CSU Soil Testing <br />Laboratory. Performed for Seneca Coal Company. <br />dtonlgomrp~ Ik''atron Amrnmt, Inc 1G5 South Union Boukuard, Suilr 410 ' Ltkrmood Colorado 80228 ' (303J iG3~5140 <br />J:\851 \rrpo.rr\pondl3rlubiG~ <br />07////99 nA <br />