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T ~ _ <br />Ms. Susan Burgmaier <br />August 31, 1995 <br />Page 4 <br />C. Upstream Channel <br />Water does not currently flow through the rock underdrain <br />of the embankment fill. No water was impounded upstream <br />of the embankment. <br />The highest 24-hour precipitation event for the previous <br />twelve months before the inspection was 1.06 inches of <br />rain on April 30, 1994. This is lower than the 10-year, <br />24-hour event of 1.6 inches. A copy of annual <br />precipitation data covering the previous twelve months is <br />attached. This format was changed from previous <br />inspection reports. Instead of providing data for the <br />water Year (October to September) which did not cover the <br />time frame from one inspection to the other, this report <br />covers the twelve months of data preceding the current <br />inspection. <br />D. Downstream Embankment Slope <br />Vegetation is sparse on the side slopes due to the coarse <br />and rocky material present in the fill. Erosion does not <br />appear to be a problem due to the relatively short slope <br />and limited area exposed to runoff. No runoff from the <br />haul road ditches can occur down the embankment slope. No <br />cracking, bulging, or other signs of stress were noted. <br />III. Conclusion <br />There appears to have been no noticeable change in the <br />embankment structure since the last annual inspection of <br />June 8, 1994. Vegetation is growing on the side slopes. <br />The embankment is stable and the underlying rock fill is <br />functioning as expected. <br />I apologize for the delay in getting this report to you and hope it <br />did not cause an inconvenience. The cause for the delay was in <br />reducing the field precipitation data charts to use in preparing <br />Table 1. If you or any other members of the Division have any <br />questions or concerns regarding this report please contact me by <br />telephone or by writing to me at this office. <br />Respe gQ~1~5G/sl <br /> ~~~. '~ G. ~r9. <br /> <br /> '" 28455 <br />Mic '~], G. Alta~%' a, P.E. <br />Engi ding Map' <br />Color `;:•~` 28455 <br />Attachment <br />AUG 31 1995 <br />c: Fred Fest (PWCC) <br />