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· ~ EXHIBIT "A" <br />· l arth Investigations C onsultants <br /> <br /> September 5, 1997 <br /> <br /> Redwood City Community Development <br /> Services <br /> Engineering and Construction <br /> 1020 Middlefield Road <br /> Redwood City, California 94064 <br /> <br /> Attention: Mr. Phong Du, P.E. <br /> <br /> RE: ADDENDUM TO PROPOSAL FOR GEOTECHNICAL SERVICES <br /> Jefferson Avenue and Madison Avenue Sewer Main <br /> Replacement Project <br /> Redwood City, California <br /> <br /> Ladies and Gentlemen: <br /> <br /> INTRODUCTION <br /> <br /> In accordance with the request of Mr. Phong Du, we have prepared this addendum <br /> to our original proposal dated August 24, 1997. In particular, Mr. Du wanted us to <br /> consider reducing the per-test charge for use of our nuclear gauge on the proposed <br /> compaction testing. In addition, Mr. Du provided more details that allowed us to <br /> develop cost estimates for specific lab testing, and field observations and testing. <br /> <br /> PROPOSAL <br /> <br /> Laboratory Testinq <br /> <br /> Perform laboratory material acceptance standard tests based upon American <br /> Society for Testing and Materials (ASTM) and Caltrans (Calif.) test methods. Test <br /> that may be required include: <br /> <br /> Geologists & Engineers <br /> 505 Tunnel Ave., Suite 6 · P.O Box 673 · Brisbane, CA 94005 · (415) 467-6645 · FAX (415) 467-7707 <br /> <br /> <br />