City of Morgan Hill Sewer System Master Plan 2017

8.2.4 Construction Contingency Allowance Knowledge about site-specific conditions for each proposed project is limited at the master planning stage; therefore, construction contingencies were used. The estimated construction costs in this master plan include a 30 percent contingency allowance to account for unforeseen events and unknown field conditions. 8.2.5 Project Related Costs The capital improvement costs also account for project-related costs, comprising of engineering design, project administration (developer and City staff), construction management and inspection, and legal costs. The project related costs in this master plan were estimated by applying an additional 30 percent to the estimated construction costs. 8.3 CAPITAL IMPROVEMENT PROGRAM The Capacity Improvement Costs for the previously identified projects in this master plan for mitigating existing system deficiencies and for serving anticipated future growth throughout the City are summarized on Table 8.2 . The Capital Improvement Program lists the type of improvement, location, cost, construction trigger, suggested phasing, and cost sharing. 8.3.1 Pipelines The recommended pipeline improvements are grouped by collection basin and listed on Table 8.2 . Each improvement includes a general description of the street alignment and limits as well as existing pipe diameter and length. x Replacement Pipeline. This improvement is intended as a replacement to an existing pipeline and along the same alignment. The existing pipeline should be abandoned when the replacement pipeline has been constructed. x Parallel Pipeline. This improvement is intended as a parallel to an existing pipeline. The existing pipeline should remain in service, even when this new improvement is constructed. The opinion of probable construction costs, for the projects included in this master plan, are based on the pipe unit costs summarized on Table 8.1 . It is assumed that any replacement pipes will be in the same alignment and at the same slope as the existing pipe. However, this study recommends an investigation of the alignment during the pre-design stage of each project. The following three pipeline improvements categories were identified: x New Pipeline. The new pipeline is proposed where none exists.

August 2017

8-4

City of Morgan Hill Sewer System Master Plan