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SCOPE OF SERVICES CITY OFSANTAANA SANTA ANA BOULEVARD GRADE SEPARATION MARK THOMAS future proposed conditions. There will need to be . Street Flow/Catch Basin analysis. Street confirmation if the Interstate 5 sump to the north flow hydraulics of the existing roadway and outputs it's pumped flow to a pipe that leads to the catch basins will be analyzed for the south to the project site to join the main drainage roadway hazard during design storm pipe. This includes a site visit to the project site to events. review the watershed and the Caltrans pump . Proposed Condition Alternative Measures. station. Conceptual designs will be developed to Based on topographic data, the improvement minimize storm flows to the proposed plans, and confirmation of the drainage patterns to project grade crossing and associated the site through coordination with Orange County pump station location. This will evaluate Flood Control District and Caltrans, Tetra Tech measures that may include diverting flows WTR will conduct a series of analyses based on around the project site, detaining water in the OCPW Hydrology Manual (OCHM) basins or offline catchments, and methodology generating high confidence flows stormwater infiltration. (per the OCHM Addendum) for flood control • A technical memorandum will be prepared, design purposes that will include the following: summarizing the baseline existing condition • A Hydrology Study. This will include an of the project drainage area and include study assumptions, results, and findings for existing condition baseline study of the each task previously fisted to inform the watershed, flow paths, concentration pump station proposed design and points, and routing delineations based on potential alternative measures that could be topography and pipe dimensions/elevations. It also includes land incorporated to limit the pump station sizing. use, and land cover per the Orange County hydrology manual and available Orange After review and incorporation of the results of the County geomatics data. baseline study by the project design team and • Rational Method Analysis. Using the pump station design team, a proposed condition hydrology input, the rational method will be analysis will be performed incorporating new implemented in AES to determine time of grading, drainage patterns, and pump station and concentration and designed discharges for pipe locations, etc. This will include: the 10, 25, and 100 year events which • Proposed condition Hydrology Study aligns with both the City of Santa Ana and • Proposed condition Rational Method Orange County Public Works (OCPW) Analysis requirements. • Proposed condition Unit Hydrograph • Unit Hydrograph Analysis. Using the Analysis hydrology input, a unit hydrograph method . Proposed condition WSPG analysis to will be implemented also to determine include HEC-HMS for modeling the pump volumes discharged to the proposed pump station functionality station. • Proposed condition Street Flow/Catch • WSPG Analysis. Pipe hydraulics will be Basis analysis, and conducted using the Los Angeles County • Proposed condition Technical 2018 WSGP software for all the proposed Memorandum pipe systems that lead to the proposed pump station and pump station outlet pipe 7.3.2 Pump Station (inclusive of structure, to the existing storm drain system. If the electrical, mechanical, SCADA) and Caltrans pump on Interstate 5 to the north Retention Basin discharges into the project area, an The design of the pump station and retention evaluation of that pump system and design includes the following: resulting outflows will be included based on provided data.