This work shall consist of the rehabilitation of existing storm water, surface water pipe culverts, and sanitary sewer lines by the method or methods specified at the designated locations described in the Contract in accordance with the requirements of this provision and as directed by the Engineer. All references to the AASHTO LRFD Bridge Design Specifications herein refer to the specific version in use by VDOT Structure and Bridge Division at the time of submittal. II. MATERIALS - GENERAL REQUIREMENTS 1. Cement grout shall conform to Section 218.03(b) or (d) of the Specifications, or be a lightweight cellular foamed concrete of at least 30 pcf unit weight and 100 psi 28-day compressive strength, with foaming agent meeting ASTM C869. 2. Method A pipe rehabilitation - Corrugated steel pipe used as pipe liners for Method A pipe rehabilitation shall conform to Section 232.02 of the Specifications and shall be 10 gage with 3-inch by 1-inch angular corrugations. Corrugated steel pipe used as liners shall be manufactured by QC/QA producers on the VDOT Materials Division's Approved Products List. 3. Method B pipe rehabilitation - Flexible pipe liners used for Method B pipe rehabilitation shall be from the VDOT Materials Division's Approved Products List, List No. 38. Liner systems may be subject to limitations for use as specified herein, by site-specific limitations for those locations listed in the Contract or as shown on the List No. 38 for the specific liner type. Where such is the case, the Contractor shall use only that type or those types that the Department has specified for the specific location listed in the Contract, and which are not limited by restrictions stated in List 38. The Contractor shall furnish the Engineer information, services, or other requirements as detailed in List 38 for all materials used for pipe rehabilitation systems specified in the Contract. 4. Method C pipe rehabilitation - Smooth-wall steel pipe used as liners used for Method C pipe rehabilitation shall conform to Section 232.02(c)5 of the Specifications. III. METHOD B LINER REQUIREMENTS Method B pipe liners shall be one or more of the following categories as designated in the Contract: 1. Category A - Cured-In-Place Pipe (CIPP) - The Contractor shall submit design calculations demonstrating the liner system conforms to the requirements of this Section. The liner system shall conform to Drainage Manual, Chapter 8, Section 8.3.6.7 - Table A, "Flexible Liner (Method B) Type Selection Guidelines for Category A systems," and shall follow ASTM F1216 Appendix X1.2.2, "Fully Deteriorated Gravity Pipe Conditions." Design calculations shall provide groundwater table elevation at crown of pipe. Design calculations shall use a HL-93 traffic loading, which may be ignored after 8 feet of cover, except for multiple barrel rehabs, where it shall continue indefinitely. Assume the total wet unit weight of soil is 120 pcf, or 135 pcf when saturated. Use a factor of safety of N = 2.0.
