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To stabilize this condition, the following measures are recommended, as <br />• shown on Figure 2, between Culverts 7 and 8: <br />1. Regrading of the road surface to achieve a 3 percent superelevation and <br />to direct all runoff to the inslope ditch. Regrading should be done in <br />fill; no cuts should be made on the road surface to avoid undercutting <br />uphill cutslopes. <br />2. The oversteepened safety berm should be pulled in using the material <br />for regrading fill. <br />In addition, it may be necessary to relocate culverts to carry off runoff from <br />the inslope ditch. <br />A related consideration involves observations of cutslopes in the general <br />area between Culverts 7 and 10 as shown on Figure 1. In this region, there is <br />evidence of seasonal concentrated seepage along the vegetation mat/natural-soil <br />interface at the head of cutslopes. Locally, this seepage causes sheet-type <br />• erosion and shallow sloughing of the cut face in conjunction with observed <br />down slope creep of the vegetation mat at the head of the cut. Concern here is <br />not with overall stability of the cutslope but, rather, with deposition of <br />material at the toe of the cut which could cause blockage of the inslope ditch. <br />As a result, the inslope ditch should be widened to 3 feet. All ditch widening <br />should take place by excavation on the road surface; the ditch should not be <br />extended back into the cutslope, as shown on Figure 2. <br />• <br />- 201 - (Rev. 5/86) <br />