Donnellson sanitary line has extensive buildup of rust, and the line is continuously getting clogged. Per a sanitary scope, the line between the clean out and lamphole cleanout needs replaced, approx. 90 feet. The DOT is seeking a plumbing vendor to remove existing 4" cast iron sanitary sewer pipe from clean out to manhole location shown on plan attached and replace with new 4" schedule 40 piping and clean out. Vendor to furnish and install all material required. Work to include excavation, cutting, fittings, infill, cast iron pipe disposal, etc. for a fully functioning sewer line repair. Iowa DOT will dispose of concrete, asphalt, and subbase debris. Iowa DOT will replace the concrete following project completion.
New section of pipe to maintain a minimum 2% slope or higher to sewer tie in location for proper pipe flow. New schedule 40 pipe to match existing pipe diameter. Assume 4” and confirm on site. All work to comply with current and local codes. Existing concrete and asphalt paving to be removed by contractor. Iowa DOT will dispose of asphalt and concrete materials. All work to be reviewed and tested prior to infill. Vendor shall place infill and 12” of granular fill flush with existing concrete. Granular fill shall be: Coarse Aggregate Type A1: Coarse aggregate, Class A crushed stone conforming to Iowa DOT SSHBC - Series 2001, Section 41 2004. Compact placed aggregate materials uniformly to achieve minimum 95 percent of maximum density.
Vendor to properly dispose of any removed/demoed cast iron piping and fittings. Any additional linear footage of sewer line replacement work to be done according to unit pricing. Reference attached site plan, photo, and original plumbing plans. Provide linear foot pricing under line 2.
