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constructed in compliance with the approved design, to the extent possible, as specified <br />In Attachment 13-4 of Seneca Coal Company's approved mine permit. MSnor field <br />adjustments Sn horizontal and vertical alignment were necessary during construction to <br />compensate for unanticipated natural conditions, limit the disturbed area, and construct <br />a structure consistent with the existing and reclaimed topography. The proposed layer of <br />stabilization fabric which was to be placetl over the stabilized subgrade prior to placing <br />embankment fill materials was not done, due to [he dry conditions at the time of <br />embankment co nsiruct io n. Hal Schlich c, our goo technical consultant, confirmed that this <br />layer was not necessary since wet conditions were not observed. <br />To [he best of my knowledge and belief, field adj ustmen[s made during construction to the <br />structure are in conformance with the Rules and Fegulat ions in the intent of the approved <br />design plans and specifications (see Exhibit 13-SAI• <br />DEC 1 ~ 1997 <br />Date <br />• <br /> <br />Sedimentation Pond 011 does meet or exceed the design and performance requirements of the <br />CMLRB's regulations. Seneca will inspect the pontl quarterly to evaluate structural <br />integrity, storage capac Sty conditions, and remedial work requirements in accordance with <br />the approved mine permit. Therefore, pursuant to Rule 4.05.6(101, the above is the <br />Sedimentation Pond Oll as-built certification report. <br />Selected References <br />Barfield, B.J., W'a rn er, R.C., and Haan, C.T. 1983. Applied Hyd rology and <br />Sedimentology for Disturbed Areas. Oklahoma Technical Press, Stillwater, Oklahoma. <br />Dotlson 6 Associates, Inc., Houston, Texas. 1986. "Pipe Culvert and Traoe zoidal <br />Channel Analysis". User's Manual and Program Feference. <br />McKOOl, D. 6., Brown, L.C., Foster, G.R., Mutchler, C.K., and L.D. Meyer. 198"7. <br />"Revised Slope Steepness Facto[ for the Universal So11 Loss Equatron". ASAE - Soil <br />and Water Division (approved for publication - June, 1981• <br />• 13-4A-11 Revised 12/12/9"7 <br />