Res 2016-181/approving an agreement with Freese & Nichols, Inc. for the provision of Professional Engineering Services in connection with the Travis Street/Heritage Drainage Outfall Project in the not-to-exceed amount of $525,375.00

Home Browse Search

BASIC SERVICES 1. SURVEY Considerable survey information was obtained during the Preliminary Engineering phase, however additional survey will be needed for further refinement and in areas not obtained (e.g. drainage outfall alignment and portions of the upper reaches of the watershed). FNI will coordinate with and support Byrn & Associates, Inc. to perform this additional survey based on their attached detailed scope of services. Services will basically be horizontal and vertical control and additional topographic surveys for two areas: Along the channel near Veramindi St to capture additionally needed information for the drainage analysis and survey information for the outfall (Design Package 1). See Byrn and Associates, proposal for more detail. 2. GEOTECHNICAL SERVICES Perform up to three (3) geotechnical bores along the outfall alignment to identify soil conditions for the purpose of design and contractor information. Two bores will be performed within the pavement area and one bore will be performed within Dunbar Park. Bores will be taken at a depth up to 15 -ft deep. Update the geotechnical findings with a letter report to be included with the geotechnical report. 3. UPDATE DRAINAGE ANALYSIS Complete a final hydrologic and hydraulic analysis for design of the proposed drainage system. All designs will be accordance to AASHTO standards at a minimum, with the ability to carry the 25 -year ultimate design flows within a proposed storm drainage system and the 100 -year system to carry the 100 -year ultimate design flows within the ROW. The City of San Marcos Standards will be used to supplement AASHTO standards where required. Design considerations for drainage within the area along the south portion of the watershed, parallel to Bishop Street from Prospect Street, crossing Hopkins, W. San Antonio St., W. Martin Luther King St and emptying into Purgatory Creek will be performed under supplemental services upon approval. The following services will be performed: A. Update the drainage divides based on new topographical survey. B. Update the 2D model prepared during the 30% design phase to incorporate Purgatory Creek water surface elevations from Halff Associates' updated HEC -RAS model. C. Perform a preliminary conceptual design of the Belvin System, anticipating that all flows will be captured along Belvin in the future and conveyed through the proposed storm drain system. D. Update the drainage design along Hopkins Street based on the conceptual Belvin System design. E. Along Hopkins Street, prepare inlet placements and calculate curb and grate inlet sizes. F. Design the discharge point and outfall into Purgatory Creek, including rock riprap, channel design, velocity control structures, and wingwall/headwall design. G. Review HGL/EGL plots to value -engineer the storm drain system for the project. A-2