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EXHIBIT A <br /> BROWN AND CALDWELL <br /> CONSULTING ENGINEERS <br /> <br /> December 16, 1988 <br /> <br /> Mr. Joseph Elliott <br /> Director of Public Works and Utilities <br /> City of Pleasanton <br /> 200 Old Bernal Avenue 11-3826-01/1 <br /> Pleasanton, California 94566 11-3826-01/6 <br /> <br /> Subject: Special Engineering Services No. 4 for <br /> Weir Design, Division of Bidding, Schedule, <br /> and Evaluation of Micro-Tunneling; <br /> Contract for Consultant Services, <br /> Preliminary Design Phase of Cross-Town <br /> Sanitary Sewer Interceptor <br /> <br /> Dear Mr. Elliott: <br /> <br /> As directed by Garry Lee on November 18, 1988, we are proceeding <br /> with the completion of the subject project with the following <br /> changes: <br /> <br /> 1. Design of an overflow weir at the junction of the existing <br /> Del Valle Trunk Sewer and the proposed Cross-Town Sanitary <br /> Sewer Interceptor. <br /> <br /> 2. Division of the project into two bidding schedules. <br /> <br /> The above changes are outside of the scope of services to our <br /> Contract for Consulting Services, Preliminary Design Phase of <br /> Cross-Town Sanitary Sewer Interceptor, dated February 2, 1988, and <br /> subsequent amendment. Furthermore, on November 28, 1988, we were <br /> directed by Mr. Lee to evaluate the feasibility of micro-tunneling <br /> as an alternate construction method for a portion of the Cross-Town <br /> Sanitary Sewer Interceptor. <br /> <br /> To evaluate the feasibility of micro-tunneling, we propose to <br /> perform the following tasks: <br /> <br /> Task 1--Evaluate Micro-Tunnelinq Construction Method. <br /> Investigate local availability of micro-tunneling machines and <br /> experienced contractors. Evaluate possible disturbance to <br /> adjacent structures and utilities during construction. <br /> Determine portion of the Cross-Town Sanitary Sewer Interceptor <br /> appropriate for micro-tunneling construction. Determine the <br /> size and location of construction sites. <br /> <br /> Task 2--Pipe Material Evaluation. Evaluate available jacking <br /> pipe material, considering resistance to corrosion, ease of <br /> '~ installation, structural loading, and costs. <br /> <br />MAILING: POST OFFICE BOX 8045 WALNUT CREEK, CALIFORNIA 94596-1220 <br />STREEt. 3480 BUSKIRK AVENUE PLEASANT HILL CALIFORNIA 94523-4342 · (415) 937-9010 · FAX: (415) 937-9026 <br /> <br /> <br />