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ht. Peter O'Connor <br />June 30, 1988 <br />Page 3 <br />II. Inspection (06/29/88): <br />A. Crest of Embankment <br />The crest of the embankment is a 60-foot wide <br />roadway used for coal haulage. No signs of <br />stress (cracks) were noted upon inspection of <br />the crest.- The roadway and side ditches are <br />well maintained. Safety berms are in place. <br />The side ditches are clean and traverse the <br />entire length of the embankment with no <br />openings for discharge onto ertbankment <br />slopes. There was no flow in the side <br />ditches on the date of the inspection. <br />B. Upstream Embankment Slope <br />Although vegetation is sparse on the side <br />slopes due to the course and rocky material <br />present in the fill, erosion does not appear <br />to be a problem. No cracking was noted on <br />the slope. Only minimal impounding had <br />occurred over the past year as evidence by <br />the lack of debris or high water lines at the <br />toe to the fill. The steel stakes set to <br />indicate the 1D-year, 24-hour storm water <br />elevation are in place and in good condition. <br />C. Upstream Channel <br />Flow does currently exist through the rock <br />underdrain of the embankment fill at an <br />estimated rate of 5 to 15 g.p.m. The flow <br />meanders through a small sediment delta at <br />the bottom of the impoundment into the rock <br />underdrain. The rock underdrain appeared to <br />be functioning properly with no evidence of <br />water backing up in the rocks from the <br />current flow. <br />The highest 24-hour precipitation for the <br />1987 Water Year was 0.88 inches on O-tcber <br />22, 1986. This is lower than the 10-year, <br />24-hour event of 1.6 inches. A copy of the <br />annual precipitation data covering the 1987 <br />Water Year is attached. <br />