TETRA TECH , INC. 1 - 2004 - Laserfiche WebLink

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" UNDERSTANDING THE PROJECT Proiect Definition In late 2001, Tetra Tech completed the design of the Elevated Water Tank Improvements. The improvements included tank safety related issues (ladder, safety climb devices, cages, balcony and walkway safety railings), enlarging the roof manholes, modifying the roof vent and cathodic protection hand hole covers, upgrading the existing valve vault and piping, and improving the drainage inside of the foundation ring. Construction bids were received, however, the bids were all above the approved budget amount. Therefore, the construction contract was not awarded. Since then, the City has completed the piping and valve vault improvements with City forces. In addition, the City has decided to paint/re-coat the tank at the same time the improvements are completed. Therefore, the City has increased the approved budget for the proposed tank improvements to include the work that was not previously completed as well as the cost to paint/re-coat the tank. Auuroach Based on our recent meeting with the City, Tetra Tech will revise the plans and specifications previously prepared for Project No. 3180 to delete the construction work that has been completed by City forces (piping and valve vault improvements). In addition, we have added Harper & Associates Engineering, Inc. to evaluate and provide recommendations for the re-coating and painting of the tank. Review Field Conditions: Tetra Tech will perform a field site visit to confirm the improvements that were completed by the City and obtain existing elevations within the foundation area. Based on the findings from the site visit, the previous base maps will be revised. Evaluate feasible alternatives for exterior access ladder: The City requested Tetra Tech to evaluate the feasibility of providing an elevator/one-man lift in lieu of the proposed ladder and safety cage improvements previously shown on the construction plans for Project No. 3180. We will prepare a design memorandum summarizing the findings including the estimated construction costs and any additional design costs in order to include the elevator within the PS&E (if a feasible option is available). A meeting will be scheduled to review and discuss the design memorandum, if a feasible option is available. Re-coating and Painting: We have added Harper & Associates Engineering, Inc. to our team to perform the field investigation and evaluation of the existing exterior and interior painting/coatings of the tank. In addition, they will perform the laboratory analyses and assist in the preparation of the technical specifications for the re-coating and painting of the tank. The field investigation can either be accomplished with the tank drained or utilizing divers depending on the preference of the City. Construction Costs: Specialized projects of this type can have a wide fluctuation in construction costs. In the current extremely busy construction market it may be difficult to find contractors who are interested in this size of specialized project. One of our challenges will be to obtain input from contractors and develop interest in the project from several specialized contractors. This will help to insure that competitive bids are received and the project can be completed under budget. CITY OF SANrAANA Elevated Water Tank Improvements TETRA TECH, INC. 2