Agmt10 RMC Water and Environment

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. Casing size or direct jacked pipe size and material · Hydraulics and sizing of the replacement pipeline based on the hydraulic model used for the City Master Plan . Utility conflicts The alignment alternatives will be developed to a point that allows a comparison of the alternatives in a matrix-type alternatives evaluation. Preliminary plan and profiles layout figures will be developed for each alternative. Opinions of probable construction costs will be developed for the construction of the project and based on results of the trenchless construction method evaluation described elsewhere. The evaluation will be based on how each alternative best achieves a set of criteria that will be developed through the alternatives development process. Each alternative will be scored against each criterion and ranked by total score. I I I j I I I Subtask 3.2: Geotechnical Investigation RMCs geotechnical subconsultant will conduct a geotechnical investigation that will include one exploratory boring at each of the Jacking and receiving shaft locations (two total) and a review of other available information on the soil characteristics. Subtask 3.2.1: Research and Site Reconnaissance Geologic and seismic research to establish geologic setting and current seismic design parametersl field mapping and notation of geology and significant surface featuresl historic topographic map review and historic air photo review to evaluate development history and changes in geomorphology. Review of pertinent construction precedent Including design and construction records of existing nearby pipelines and structures as provided by the City of Redwood City and from DCMjGeoEngineersl current South Bayside System Authority project files. Subtask 3.2.2: Boring Locations, Utility Notifications and Permits Field mark a total of two (2) proposed test boring locationsj one (1) at planned launching and receiving pit locations at each end of the proposed Highway 101 undercrossings in public right-of-ways In Maple Street and Walnut Street. Notify Underground Service Alert (USA) prior to beginning field work so that public and private underground utilities can be identified and proposed boring locations cleared. r.. ; For the performance of the test boringsl obtain (1) a drilling permit from the Environmental Health Services Division of San Mateo County, and (2) an encroachment permit from the City of Redwood City. This scope of work assumes that the City of Redwood City will waive any encroachment permit fees and that no other permits or rights of entry or access will be needed. Subtask 3.2.3: Subsurface Investigation Drill a total of two (2) test borings at the sites indicated in Subtask 3.2.2, each to a depth of 15 feet below the planned Invert of the proposed pipeline, to a maximum of 40 feet below the existing ground surface. A continuous log of soli and groundwater conditions will be maintained by GeoEngineers' field engineer. Disturbed and "undisturbedJl soil samples will be taken at maximum 5-foot vertical Intervals with continuous sampling through the anticipated tunnel zone plus one diameter above and below. The test borings wJII be backfilled with grout in accordance with City and County permit requirements and capped with a minimum of 6 inches of cold patch asphalt or quick-set concrete. Soil cuttings will be disposed of off-site, This scope of work and budget assumes that contaminated 5011 and/or groundwater will not be encountered. If any unusual vapors, odors or visual contamination are noticed during drilling of any test boring, the boring will be stopped, backfilled with grout and the suspected drill cuttings will be bagged, labeled for future source reference and provided to the City for disposal. This i..