Attachment_C_-_18_Inch_Line_Alternative_Alignment.pdf

This is an engineering design attachment for the 18-Inch Sewer Replacement Project in California, specifically depicting the alternative alignment for an 18-inch sewer line replacement. The document illustrates a proposed route that relocates an existing 18-inch cast iron pipe sewer crossing beneath the Union Pacific Railroad corridor to a new gravity sewer alignment outside of the railroad right-of-way. The design includes multiple components: new 60-inch pour-over manholes, new 60-inch standard manholes, new 18-inch polyvinyl chloride sewer pipe, a 30-inch water service pipe encasement section, and abandonment and plugging of existing facilities. The plan notes uncertainty regarding the connection of one proposed pour-over manhole to existing manhole 10J-M060 and indicates areas where existing infrastructure will be abandoned in place.

The attachment serves as a technical exhibit supporting the consulting services RFP, which requests qualified firms to provide surveying, hydraulic evaluation, engineering design, permitting support, preparation of Plans, Specifications, and Estimates, bidding support, and construction-phase engineering services. This alternative alignment represents one design option for the project, with detailed notation of manhole locations, pipe sizing, and existing facility modifications necessary to accomplish the sewer relocation outside the UPRR easement.