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SPECIAL PROVISIONS - CAST IN PLACE CONCRETE PIPE Cast in place pipe shall be constructed by a process that has been successfully used and by a Contractor that has satisfactorly constructed comparable pipe for at least five (5) years. Both process and qualifications of the Contractor shall be acceptable to the Engineer. Prequalifications as described in the foregoing paragraph shall be approved by the Engineer prior to the opening of bids. Acceptance of pipe shall be based upon meeting the tests herein specified and by inspection to determine the conformance with the Standard Specifi- cations and these Special Provisions. Any unacceptable portion of the pipe- line shall be repaired or replaced to meet thesb specifications at the expense of the Contractor. Concrete shall be Type II Portland Cement. Slump shall not exceed 2 inches as determined by the Slump Cone Test ASTM Designation C-143-58 and amendments thereto, unless a modification of this slump is ordered by the Engineer. Aggregate for pipe 48 inches or less in diameter shall not exceed one inch, or one and one-half (11) inch aggregate for pipes larger than 48 inches in diameter. Compressive strength of concrete shall not be less than 1400 psi at three (3) days, nor less than 2100 psi at seven (7) days, nor less than 3500 psi at twenty-eight (28) days, as determined by moist-cured test cylinders. Pipe trench shall be excavated to the lines and grade shown on the plans therefore, or as directed by the Engineer. The trench bottom shall be graded and prepared to provide firm and uniform support by undisturbed or compacted earth throughout the bottom 230 degrees of the pipe periphery. Where strata or lenses of loose sand, silt or other noncohesive soils are encountered below the contact line of the pipe and trench wall, such strata or lenses may be stabilized by the application of asphaltic emulsions or cement mortar membranes which will provide a stable surface free from voids, or by overexcavaffo'n 'and`r'ep'tac'ement with concrete as the. pips Is.poured. No additional com6gnsation will be allowed for such trench treatment. [� PLi'3'14,' P.gfir;v ❑ Ow;,;:r En CJ ArchitEQt ""."••..._ Other .... ........ .'_Y� ..............................