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Q1) Regarding the culverts to be lined with cured-in-place pipeliners at locations 1-4 and 6-16, there is no depth, slope, or invert elevation information provided for these culverts in the bid documents. Please provide pipe depths in terms of maximum soil cover over the pipe crown, and either pipe slopes or invert elevations at both ends of each culvert for these culverts. The depth information is needed for designing the CIPP thickness, since specifications require groundwater to be calculated at half the pipe depth. The slope &/or invert elevation information is needed for determining appropriate cleaning and installation procedures to be used.
A1) Use CIPP thickness as in section 10-1.13, Cured-in-Place Pipeliner (CIPP), acceptance criteria No. 4. 28Mar11.
Q2) For the culverts to be lined with cured-in-place pipeliners at locations 1-4 and 6-15, the specifications currently require the CIPP thickness to be at least 0.7 inches (17.8mm). This is an extremely thick minimum thickness, especially in the smaller diameters, and likely much thicker than any CIPP thickness design calculation would produce. Please re-evaluate this minimum thickness requirement and either eliminate it or reduce it to a lower minimum required thickness for the CIPP.
A2) Use CIPP thickness as in section 10-1.13, Cured-in-Place Pipeliner (CIPP), acceptance criteria No. 4. 28Mar11.