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I~~ 11- BkF EXHIBIT fr-; - APPROACH Redwood Shores - Levee Improvements PROJECT UNDERSTANDING Our understanding of the levee improvements is based on a meeting with the City on 2/5/09 and a Levee System Existing Condition Report by Moffatt & Nichol. Levees surrounding Redwood Shores vary in elevation ranges from 9' -1 0' and over 12'. A section in the northeast portion of Redwood Shores is anticipated to be redeveloped and is currently undergoing improvements including levee reconstruction by the developer. This area (Area H), as well as the reach adjacent to the SBSA land (Segment III), is excluded from this proj ect. The goal of this project is to make improvements to the levee. Based on recommendations from Moffatt & Nichol, crest elevations will be increased to meet FEMA requirements. Reinforcement will be added to areas experiencing sloughing. The design for the improvements will incorporate environmental guidelines provided by others. SCOPE OF SERVICE Task 1. Data Collection and Alternative Evaluations Task la. Attend Coordination Meetings BKF will attend one coordination meeting with City staff to discuss design concepts and constraints. Task lb. Data Collection BKF will perform a site walk in the locations of the deficiencies notes by Moffatt & Nichol. BKF will review the geotechnical report and recommendations from ENGEO. No additional topographic survey is included at this time. Task Ie. Preparation and Evaluation of Alternatives Based on design details and criteria from ENGEO, BKF will prepare exhibits representing 'three different alternatives; (1) earth embankment, (2) geo-cell embankment and (3) sheet pile retaining wall. Improvement goals will be to increase the height of the levees while taking into account future settlement. The minimum levee crest elevation, which will vary per recommendations by Moffatt & Nichol, is intended to be maintained for a specified period of time. We anticipate this increased height may be up to three feet. If Moffatt & Nichol determines that the levee must be raised greater than three feet, use of a wall system may be less cost. At the City's request, evaluation and design of walls can be provided as an additional service. Reinforcement of existing sloughed areas will consider maintaining and encouraging growth of native vegetation. City of Redwood City - Redwood Shores Levee Improvements Date: February 20, 2009 650.482. 6300 www.bkf.com