Res 2015-010/agreement between the City and Freese and Nichols, Inc. for the provision of Professional Engineering Services in connection with The Hopkins Street: Bishop to Moore Improvements Project

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Hopkins Street — Preliminary Engineering Attachment A January 22, 2015 (b) The downstream study limits will be the outfall locations of discharge points 1, 2 and 3 at Purgatory Creek. Hydraulic analysis will extend upstream from Purgatory Creek to the upstream side of Hopkins Street. Assumptions will be made regarding the location of discharge entry points for simulation of flow crossing the roadway. (c) The closed storm drain system along Blanco Street will be included in the models. (d) Execute model, analyze results and iterate as necessary to create a stable simulation of existing hydraulic behavior for storm events identified above. (e) Document extents and depths of flooding within the limits of the detailed study area. (f) Existing condition deliverables include GIS shapefiles and exhibits showing inundation mapping with depth grids for the area between Belvin Street and Purgatory Creek. A written memorandum will summarize assumptions and methodology utilized in the creation of existing conditions. (2) Initial Development of Proposed Improvements (a) Meet with City and Project team to discuss existing conditions flooding limits and affected properties upstream and downstream of the project limits. (b) A range of 3 — 5 improvement alternatives will be discussed for possible additional improved conditions modeling. Improvements alternatives may include, but are not limited to utilization of existing and proposed roadway sections to convey storm drainage; diverting flows to maximize the efficiency of the existing closed storm drain system in Blanco; additional closed storm drainage systems extending downstream to Purgatory Creek; channel improvements from Discharge Point 2 downstream to Purgatory Creek; parallel relief lines in West Hopkins to Purgatory Creek, Cross - Drainage sizing at Bishop and Travis Streets. (3) Proposed Conditions (Additional Service to be added upon request by the City) (a) Update H &H Models for improvement alternatives as selected in meeting with City staff (Task 4.D.2). (b) Evaluate impacts to upstream water surface elevation, downstream discharge and velocity for each of the proposed alternatives. (c) Document alternatives considered, resulting inundations levels, upstream and downstream impacts and opinions of probable construction costs. Tabulate pros and cons of each alternative considered. (d) Meet with City Staff and Project team to select preferred alternative for 30% level design. (e) Summary design report documenting methodologies, alternatives considered, updated opinions of probable construction costs, benefit cost considerations, and a recommended improvement alternative to advance to preliminary design. S. Roadway and Pedestrian Schematic Design A. Develop Schematic Design: (1) Complete Street Analysis: Perform and document the ASCE 6 -step process for Complete Street Design to define street type and initial cross - section. (2) Prepare exhibits and assist with public input (Task 6) (a) Seek input from the residents related to the street geometry and pedestrian level improvements to be considered by the City for inclusion in the project. (b) Meet with the City to review input and select final proposed roadway improvements. [OFF14041] L: \OLCR \San Marcos