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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 001) <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 A GEOTECHNICAL EXPLORATION - PHASE 1 <br /> <br />Dear Mr. Mansfield: <br /> <br />Weare pleased to submit this proposal to conduct Phase 1 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 1 of our proposed scope of service presented herein will comprise the geotechnical <br />exploration phase of service only. Phase 2 of our proposed scope of service will be submitted <br />under separate proposal and contract and will include existing data review, laboratory testing, <br />analyses, reporting, and design assistance. <br /> <br />Our proposed Phase 1 study is intended to obtain subsurface information by collecting soil <br />samples and performing in-situ soil testing. This information will then be analyzed and used to <br />develop recommendations for use in design of improvement alternatives as part of Phase 2 <br />activities. We understand several levee raise alternatives are being considered for the various <br />locations along the existing levee. Potential levee raise alternatives may include placement of <br />fill, a concrete masonry unit (CMU) flood wall, geocell units, an inflatable bladder, and vinyl <br />sheet piles. <br /> <br />SCOPE OF SERVICES <br /> <br />Our scope of services under the Phase 1 proposal will include only the geotechnical exploration <br />phase of service. The associated tasks include the following: <br /> <br />1. Prior to drilling, ENGEO Incorporated (ENGEO) will obtain the required drilling permits <br />from the County of San Mateo (County) and complete the appropriate Underground Service <br /> <br />2010 Crow Canyon Place, Suite 250 · San Ramon, CA 94583 · (925) 866-9000. Fax (888) 279-2698 <br />www.engeo.com <br />