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Roadside Refuse Disposal Area Inspection - 3rd Quarter 2002 <br />checked this channel configuration to assure it would pass the design flow with adequate <br />freeboard. This as-built Segment A will pass the design flow with a freeboard of 1.3 feet. <br />Segment A also has a section that has 15% grade instead of the 3% grade called for in <br />the original design. I checked the riprap size in the channel at the 15% grade. The D~ <br />riprap size is 15" instead of the 9" called for in the original design. I do not consider this a <br />significant concern since the contractor placed larger riprap through this 15% section. <br />Segment B is is a trapezoidal channel with a 3-foot wide bottom, 23% grade and 3.11 <br />feet deep with freeboard. There are segments of this as-built channel segment that are <br />up to 35% grade. I checked the riprap size in the channel at the 35% grade. The Dso <br />riprap size is 18" instead of_the 15" called for in the original design. I do not consider this <br />a significant concern. The ditch segments that are only 2-feet deep will pass the design <br />flow. The design flow in all of the segments is less than 0.4 feet. Therefore, the as-built <br />freeboard in the shallow sections of the ditch is 1.6 feet. Ditch Segment C was not <br />constructed during the quarter. This ditch segment will be constructed after Pond 9 is <br />removed. <br />The two benches were also finished during the quarter. The benches have a grade of <br />approximately 5% to the inside and approximately 2% north toward a drainage channel. <br />A failure of the pile would probably not be a hazard to human life. Even though the pile <br />is fairly close to the Interstate 70 east bound lanes, if the coal mine waste bank failed, it is <br />unlikely the material would move far enough to encroach upon the freeway. <br />I certify that to the best of my knowledge and belief with the exceptions noted above, that <br />,m=a <br />the fill and other aspects of the roadside refus~~~g® dt'~~® ave been constructed as <br />permitted in the design approved by the DNl~,°r ; E STO~~'o9 / <br />f <br />~ en~s~ a~5` r Date <br />Attachments: ~~i0'f ~ t <br />~oaaL <br />Pictures of erosional feature <br />SEDCAD 4 Check Calculations: <br />Segment A with 1.5% slope and 2'-depth <br />Segment A riprap size <br />Segment B riprap size <br />