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B. Highway Drainage Culvert #1 and Bypass Culvert <br />This existing culvert system is shown as features #10 and #11 on <br />Exhibit 3A. The configuration of the culverts after completion of <br />drainage modification work is shown in plan view on Exhibit 36. The <br />CONTRACTOR shall reconstruct the outlet end of the highway culvert by <br />daylighting or exposing the outlet end to forma trapezoid shaped <br />riprap lined drainage channel for a minimum distance of 50 feet from <br />the outlet end and in the cross sectional configuration shown on <br />Exhibit 4C. The buried bypass portion of the culvert extending from <br />the outlet end of the highway culvert to near the river embankment <br />shall be removed as necessary to accomplish the regrading work. In <br />the event required regrading work can be completed to the specified <br />lines and grades without exposing the buried culvert, both the <br />highway culvert outlet end and the buried bypass culvert can be left <br />in their present configuration. <br />C. Highway Drainage Culvert #2 <br />This culvert is shown as feature #13 on Exhibit 3A. The plan view <br />configuration of this culvert after completion of drainage <br />modification work is shown on Exhibit 3B. The CONTRACTOR shall <br />reconstruct the portion of the culvert located south of the highway <br />by daylighting or exposing the culvert at some distance between <br />5 feet and 15 feet from the south edge of the highway pavement. The <br />CONTRACTOR shall construct a new outlet end at this point by removing <br />the remains of the buried culvert extension and constructing a riprap <br />lined drainage channel beginning at the outlet end and extending a <br />minimum distance of 50 feet down the slope of the regraded surface. <br />Exhibit 4C contains a cross sectional diagram showing the required <br />configuration of the channel segment. <br />D. Highway Drainage Culvert #3 <br />This culvert is shown as feature #48 on Exhibit 3A. The plan view <br />configuration of this culvert after completion of drainage <br />modification work is shown on Exhibit 3B. The CONTRACTOR shall <br />reconstruct the portion of the culvert located south of the highway <br />by constructing a minimum 50 foot long trapezoidal shaped drainage <br />channel beginning at the existing outlet end and extending down the <br />regraded hillslope. Exhibit 4C contains across sectional diagram <br />showing the required configuration of the channel segment. <br />-24- <br />