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GN" 10i PAGE 5,19 length of pipe connecting to the box culvert and joining existing metal pipe in the 161' Street right-of-way. The Public Works Department staff is of the opinion that the entire length of all fourteen storm sewer laterals should be replaced and not simply the last downstream section. In addition, the laterals should be enlarged to improve Rockridge drainage. Staff has communicated with the DOT and consultant, Dames. and Moore, Inc., regarding the County joining into the project to replace the entire length of all fourteen laterals. The Consultant originally proposed a fee of $29,000 to revise the design. The Public Works Department objected to this cost. Recent negotiations have resulted in a fee of $18,482.74. ALTERNATIVES AND ANALYSIS = The entire length of all fourteen laterals including new terminating structures (catch basins) are needed. There are numerous advantages and some disadvantages to the County entering into a joint project agreement with the DOT. The construction cost should be less since the Contractor will already be mobilized and lesser unit costs are usually attributable to large cost projects. The attached engineering scope of services has been prepared by the Public Works staff, DOT and Consultant (Dames and Moore, Inc.). The engineering and permitting cost is $18,482.74 and the construction cost is estimated to be $40,000. The alternatives presented are: Alternative No. 1 - Authorize staff to prepare an agreement with -Dames and Moore including the attached scope of work and agenda it for future Board action. In addition, request DOT to prepare a Joint Project Agreement to replace the entire length of all fourteen laterals and terminating structures. Alternative No. 2 - Do not replace the entire length of the fourteen laterals and allow the DOT work to proceed as originally proposed. RECOMMENDATIONS AND FUNDING Staff recommends-Attemative No.1 whereby staff is authorized to prepare the agreements for future Board action. Funding to be from 10 Local Option Sales Tax ($1,100,000 budgeted in FY98199 for Drainage purposes). MAY 20, 1997 84