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<br />ENGEO <br /> <br />INCORPORATED <br /> <br />GEOTECHNICAL <br />ENVIRONMENTAL <br />WATER RESOURCES <br />CONSTRUCTION SERVICES <br /> <br />Project No. <br />P2009.000.164 (phase 002) <br /> <br />April 15, 2009 <br />Latest Revision June 30, 2009 <br /> <br />Mr. Jason Mansfield <br />BKF Engineers <br />255 Shoreline Drive, Suite 200 <br />Redwood City, CA 94065 <br /> <br />Subject: <br /> <br />Levee Improvements Adjacent to the San Carlos Airport <br />San Mateo County, California <br /> <br />PROPOSAL FOR GEOTECHNICAL EXPLORATION SERVICES - PHASE 2 <br /> <br />Dear Mr. Mansfield: <br /> <br />Weare pleased to submit this proposal to conduct Phase 2 of our geotechnical exploration <br />services in support of the Levee Improvements Adjacent to the San Carlos Airport project in <br />San Mateo County, California. The purpose of our study is to assist the design team in <br />evaluating the improvements of the San Carlos Airport levee system to comply with current <br />FEMA standards. We understand the improvements will be designed to tie into the adjacent <br />levee systems owned by the City of Redwood City (to the north) and the City of San Carlos (to <br />the south). We performed a site visit, reviewed existing data for the City of Redwood City levee, <br />and reviewed historic aerial photographs in preparing this proposal. <br /> <br />Phase 2 of our proposed scope of services presented herein includes existing data review, <br />laboratory testing, analyses, reporting, and design assistance using samples collected during <br />planned Phase 1 services. Phase 1 of our proposed scope of service will be presented under <br />separate proposal and contract, and is planned to comprise the geotechnical exploration phase of <br />service only. <br /> <br />Our proposed Phase 2 study is to take subsurface information and samples collected from <br />Phase 1 and perform laboratory testing and analysis. This information will be used to develop <br />recommendations for use in design of improvement alternatives. We understand several levee <br />raise alternatives are being considered for the various locations along the existing levee. <br />Potential levee raise alternatives may include placement of fill, a concrete masonry unit (CMU) <br />flood wall, geocell units, an inflatable bladder, and vinyl sheet piles. <br /> <br />SCOPE OF SERVICES <br /> <br />Our Phase 2 scope of services will include review of available literature, geologic maps, historic <br />aerial photographs, and any geotechnical reports pertinent to the site. We will also perform <br /> <br />2010 Crow Canyon Place, Suite 250 · San Ramon, CA 94583 · (925) 866-9000 · Fax (888) 279-2698 <br />www.engeo.com <br />