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From THE UULCRN RRNCH CO <br />PHONE No. 303 964 3601 • <br />-1fi- <br />De c. 09 1994 12:S1PM P11 <br />sire GRADING <br />Dared on LY~c general soil conditions encountered, slopes <br />graded to 1.7$ horizontal to 1 vertical and flatter Ulrich are <br />properly compacted and drained should De relatively stable <br />against massive failure. Steeper slopes such as that proposed <br />near Portal No. t will have a higher potential for instability. <br />Seepage and wet aurfaco conditions will be adverse to slope <br />stability and could cause slope failure. IF wet conditions <br />develop in 1 to 1 graded elopee near Portal No. 1, significant <br />slope movement could occur. We aesume that some Slope movement <br />can he tolerated. <br />Fill section areas should be properly prepared before embank- <br />ments construction. Before fill placement, the subgrade should <br />be prepared by removing topsoil and vegetation, sr_arifying to a <br />dcptlr of abouL• f inches, adJuating the moisture content to near <br />optimum and compacting to at least 95S oC standard Proctor <br />density (ASTN D698). Compaction of fill embankments to at least <br />95>: standard Proctor density within 2 percentage points of <br />upLiniunr moisture as specified appears atlequate. To reduce <br />problems associated with settlement of deep fill sections, com- <br />paction nray De increased to at least 1002 of standard Proctor <br />density. The till strould ue ~preaJ Sn Chin horizontal layers and <br />compacted to ttre JuL spcaifications. The fill should be benched <br />into hillsides steeper Liras 201;. Nun-structural (miscellaneous <br />landscaped areas) backCil] may De compacted to at least 90Z of <br />~ standard Proctor density. <br />CLcn &Assucintes <br />