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~ ~i i~ <br />203.09 <br />203.09 Proof Rolling. Proof rolling with pneumatic [ire equipment shall be <br />performed using a minimum axle load of I S kips per axle. Aweigh ticket from an <br />approved scale shad be famished by the Contractor to substantiate this weight. <br />The subgrade shall be proof rolled after the required compaction has been obtained <br />and the subgrade has been shaped to the required cross section. <br />The proof roller shall be operated in a systematic manner so [hat a record may be <br />readily kept of the area tested and the working time required for the testing. Areas that <br />are observed [o have soft spots in [he subgrade, where deflection is not uniform or is <br />excessive as determined by the Engineer, shall be ripped, scarified, dried or wetted as <br />necessary and recompacted to the requirements for density and moisture a[ the <br />Contractor's expense. After recompaction, these areas shall be proof rolled again and <br />all failures again corrected at the Contractor's expense. <br />Upon approval of the proof rolling, the sub base, base course, or initial pavement <br />cowse shall be placed within 48 hours. If the Contractor fails to place the sub base, <br />base course, or initial pavement course within 48 hours or the condition of the <br />subgrade changes due to weather or other conditions, proof rolling and correction <br />shall be performed again at the Contractor's expense. <br />203.10 Presplitting. When presplitting is designated in the Contract, the top of the <br />. rock slope will be established by the Engineer. The Contractor shall drill the bore <br />holes along the slope line, maintain [he drill holes at the angle designated in the <br />Contract, and enswe that al] drill boles are in the same plane. The diameter, spacing, <br />and loading of presplit holes shall result in a neat break. The presplitting holes shall <br />be drilled for the full depth of the ledge. <br />The initial presplitting of each geological formation shall be accomplished utilizing a <br />100 foot test section. After drilling, loading, and shooting this test section, the <br />material shall be removed so the Engineer can determine if the diameter, spacing, and <br />loading of [he presplit holes are adequate [o give an acceptable backslope. If the <br />results are determined acceptable by the Engineer, the presplitting may continue <br />throughout the geological formation using those methods and procedures. If the <br />presplitting is determined unsatisfactory, the Contractor shall make adjustments in the <br />spacing, diameter, loading, or a combination thereof of the presplit holes utilizing <br />another test section. <br />Presplitting holes shall be loaded with explosives in accordance with the <br />manufacturer's recommendations. The cost of presplitting shall be included in the <br />contract unit price for rock excavation. <br />203.11 Blading. Blading shall consist of furnishing motor graders of the speci£ed <br />horsepower rating, with operators, for shaping roadway, shoulders, or other areas as <br />designated by the Engineer. <br />• 146 <br /> <br />