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<br /> <br />some areas where the safety berms are omitted and where slope stability is a <br />consideration. <br />' The roadway culvert crossings recommended include a series cP 6 <br />culverts located as shown on the plans on the Exhibit maps in sizes ranging <br />' from 21"-36". All culverts have been designed to accommodate a 25 year storm <br />event with an HW/D of 2. Culverts were sized for Corrugated Steel Pipe <br />' (CSP), 2z/s x 1/x annular corrugations, unpaved !overt, Manning coefficient <br />for roughness of 0.027. A minimum 16 gage thickness is recommended wl~:h a <br />Class B bedding condition to accommodate an HS-20 line load. Pipe lenf;ths <br />vary as to location and skew angle but all are less than 100' so an anti ~ eep <br />1 collar is not recommended. <br />Each location is relatively unique in its individual requ[rement to <br />' accommodate either road ditch runoff, natural runoff from the South or b~~th. <br />Entrance and exit conditions will need to be addressed on a "site by site" b,isis <br />' considering existing topography and grades so a functional facility results vrith <br />a minimum oP additional disturbance. Grouted rock headwalls or special end <br />~ sections may be necessary in some locations. <br />' The following is a tabular summary of the roadway culvert cros:~ing <br />system proposed in this plan. Refer to the Exhibits and Typical Road Section <br />for additional information. <br />t <br />LENGTH <br />' CULVERT +M M_P. 'I- SIZE CSP) ze CFS) (FT`/-Z <br /> HR-6 0.14 24" 56.4 60' <br />i HR-5 0.30 21" 14.1 60' <br /> HR-4 0.36 30" 37.9 85' <br />' HR-3 0.55 36" 52.6 130' <br /> HR-2 0.80 27" 28.2 65' <br /> HR-1 0.92 27" 26.8 85' <br />1 <br />s <br />1 <br />