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Method to determine peak flow rates to aid in calculating depth of flow in the street during 2-, 5-, 10- and 100 -year storm events. CONSULTANT will use the 100 -year storm event to check City drainage criteria to contain flow within the right-of-way. In order to determine the footprint of storm water management measures, CONSULTANT will calculate the volume of flow generated during each design storm event, and will use the 6 -hour storm duration depths for each recurrence interval to determine volume needed to be contained. CONSULTANT will use Attachment G of Redwood City Design Criteria for rainfall data. Deliverables: Drainage Map (PDF format) TASK 2 — SURVEY AND GEOTECHNICAL INVESTIGATION 2.1 Ground Survey: CONSULTANT will plan on conducting full topographic survey of the intersection of Oakwood Drive with East Oakwood Boulevard. This will include surveying: a. 100 -feet of Oakwood Drive, and b. 100 -feet of East Oakwood Boulevard, at the intersection CONSULTANT will perform conventional ground topographic survey of the existing surface improvements using GPS RTK survey. The survey horizontal datum will be on CA State Plan Zone III and the vertical datum will be on NAVD88. If we cannot obtain GPS signal, CONSULTANT will place the survey on an assumed datum and provide control information to aid in preparing future bid documents. Prior to scheduling survey, CONSULTANT will request USA to mark utilities so that CONSULTANT'S survey crew can pick-up the paint markings and place it on the topographic map. The intersection topographic survey will include: a. Surface materials including edge of pavement, flow lines, grade breaks, grades along right-of-way and edge of fence or landscape/partition walls b. Sanitary sewer manhole rim elevations, pipe inverts at manhole, pipe diameters, sanitary sewer lateral cleanouts and sanitary sewer lines. c. Storm drain or storm sewer manhole rim elevations, pipe inverts at manhole, pipe diameters, drain inlets bottom, drain inlets pipe inverts, catch basin grate elevations and storm drain lines. d. Water valve boxes, meter boxes, anode boxes, fire hydrants and water lines. e. Gas valve boxes and gas lines. f. Traffic signal boxes, street light boxes, utility vaults, electrical poles, loop detectors, traffic sign posts, street lights, and electrical lines. g. Cable TV boxes, Cable TV lines, telephone poles, telephone lines and REV: 10-12-18 PR Page 11 of 14 ATTY/AGR.2018.246/BKF Engineers - Oakwood Drainage Management