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EXHIBIT ~ iii 40 YC'MS of Service 405 Clyde Avenue Mountain View, CA 94043 :1969 i2009 650.967.2365 PHONE 650.967.2785 FAX www.TRCsolutions.com November 24, 2009 172484 Mr. Joel B. Evora CITY OF REDWOOD CITY INFRASTRUCTURE AND TRANSPORTATION DEPARTMENT 1017 Middlefield Road Redwood City, California 94062 RE: REVISED PROPOSAL FOR GEOTECHNICAL SERVICES REDWOOD SHORES LAGOON BELMONT SLOUGH PUMP STATION IMPROVEMENT PROJECT REDWOOD CITY, CALIFORNIA Dear Mr. Evora: As requested, we are providing our revised proposal for geotechnical services for the proposed Redwood Shores Lagoon Belmont Slough Pump Station Improvement Project in Redwood City, California. Our proposed scope of services to complete a geotechnical investigation for the project is presented below. We have prepared this agreement based on our previous work in the area, our site visit. We also reviewed the project plans, prepared by BKF Engineers, undated. We performed the geotechnical investigation for the Redwood Shores Branch Library located on the north side of Marine Parkway. The subsurface condition at that location consisted of 7 to 8 feet of sandy clay fill over 20 to 25 feet of Bay Mud, over medium dense sands and stiff clays. We anticipate that the Bay Mud thickness is less at the location of the existing intake structure as the drawings indicate that it is founded at a depth of approximately 17 feet below the existing site grade. We would anticipate some Bay Mud to be present at the location, but the proposed 30-foot boring depth should be adequate, and can be adjusted in the field if conditions warrant. THE PROJECT The existing intake structure is located on the north side of Redwood Shores Lagoon, south of Marine Parkway in Redwood City, and consists of a reinforced concrete structure approximately 10 feet by 20 feet in plan and based 17 feet below the existing site grade. The proposed discharge chamber will be of