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Special Provisions - CIPP (Con't) If soft and spongy soils are encountered, soil shall be stablized or replac- ed in conformance with Section 19 of the Standard Specifications. Should conditions be encountered under portions of the pipeline which make the use of cast-in-place pipe unsatisfactory, in the judgement of the Engineer, he may require the use of precast pipe in such locations. The additional special inspection cost provided for later in this section shall not be appli- cable to precast pipe so substituted. At the time of concrete placement, all soils in contact with cast-in-place pipe shall be moist, stable and the trench shall be completely free of water, mud and debris. Concrete shall be mixed and placed in conformance with the applicable portions of the Standard Specifications, except as directed by these Special Provisions. Fresh concrete shall not be permitted to fall from a height greater than six (6) feet without the use of adjustable length pipes or elephant trunks. Minimum wall thickness for the various sizes of pipe shall conform to the fol lowing: Internal Diameter Minimum Wall Thickness 30" 3111 48" 5" 60" 6" 72" 7" The actual internal diameter of the pipe at any point shall not be less than 98% of the nominal internal diameter. Offsets at form laps and horizontal edges shall not exceed the thickness of the forms plus seven (7) percent of the minimum wall thickness. The temperature of the concrete, when being placed shall not be more than 90 F. in moderate weather. In weather during which the mean daily temperature drops below 40 F. , concrete when placed, shall not be less than 50 F. , and if the daily mean temperature remains below 40 F. for more t ferfhglT`d;�y'srlf e7 ctineret"hall�#�maj�.p ed at a temperature ofd qN agr.'ealer fpr, a period bf seventy `�Yo 2) hours after_-placing. C me`iib' b_!gt6d LAgatNlst f ee �r ? n add- itional three (3) days. s`teuP„a � a'Ld d ti ey I�em � d When artificial heat is required, caution shall be exercised to prevent the concreterL HP'u iY.*intpncy --- -------- -------•------------_--- ------- ------.................... LIC " r ......... ....... ..................... Concrete shale€rrr}irec� b1C__RRg.Rf.the- two-following--methods: ................. .......................................................- ................... ,I O ;h'r ---- _]G..... ...............