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Dan Mathews <br />May 15, 1991 <br />Page 4 <br />of annual precipitation data covering the 1990 Water <br />Year is attached. <br />D. Downstream Embankment Slope <br />Vegetation appears somewhat thicker on this slope than <br />on the upstream slope. Erosion does not appear to be a <br />problem due to the relatively short slope and limited <br />area exposed to runoff. The only significant runoff <br />from the haul road ditches would occur through a <br />controlled downdrain at the north abutment of the <br />embankment. No cracking, bulging, or other signs of <br />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 <br />of May 23, 1990. Vegetation is growing on the side <br />slopes. The embankment is stable and the underlying <br />rock fill is functioning as expected. <br />If you have any questions or concerns regarding this report, <br />please contact me by telephone (602) 774-5253 or by writing <br />me at this office. <br />.e ~ <br />• Roia~~ J. ~gke :~i <br />Se~i,B~~ Engineer Sc. <br />Col ~P~Gp~.Reg. Nod ~59 spy <br />•`F ••......•• ~ • <br />bd ~`:~Oppl E~r~~ ~~ <br />c: Fred Fest ~Q' <br />Chuck McCulloh <br />