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Exhibit 90. Condition rating guidelines.......................119 Exhibit 91. Shape inspection structural plate box culverts...... .... ..... ... ... ...... . ... . .. ... .. . . .121 Exhibit 92. Condition rating guidelines.......................122 Exhibit 93. Typical long-span shapes..........................124 Exhibit 94. Simple linear measurements may not describe the structural shape.....................125 Exhibit 95. Shape inspection crown section of long span structures.................................. .127 Exhibit 96. Shape inspection low profile long span arch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .128 Exhibit 97. Condition rating guidelines.......................129 Exhibit 98. Shape inspection high profile long span arch........................................ .131 Exhibit 99. Condition rating guidelines.......................132 Exhibit 100. Shape inspection long span pear-shape.............133 Exhibit 101. Condition rating guidelines..................... ..134 Exhibit 102. Potential for differential settlement in hori zonta 1 ell ipse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135 Exhibit 103. Shape inspection long span horizontal ell ipse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136 Exhibit 104. Condition rating guidelines.......... .............137 Exhibit 105. Surface indications of infiltration...............140 Exhibit 106. Example of severe infiltration of backfill material through separated joints......................... ,............... .. .141 Exhibit 107. Severe infiltration of ground water through separate joint........................... .142 Exhibit 108. Results of poor and good side support, rigid pi pe. . .. .... . . . .. ... . .. . . .. . . . . .. .. . ... . . . . .143 ix