09 - Laserfiche WebLink

BACKGROUND The City's water distribution system includes storage reservoirs, pump stations, pressure reducing stations and pipelines within eighteen pressure zones. The largest of these, the "lower zone" includes the central, flat part of the City below an elevation of 390 feet and serves approximately 80% of the community, including almost all commercial water demands. The other zones serve smaller areas and include the Bonde zone, the Ruby Hill upper and lower zones, the Kottinger Ranch zones, etc. The recommended project will benefit both the lower zone and the Bonde upper zone. As part of the City's water system maintenance efforts, the Four Year Capital Improvement Program (CIP) includes funding for ongoing annual water system maintenance that focuses on replacing aging water mains that have a potential for breakage and leaks. Water main replacement projects are selected by the City's Utilities Division based on a combination of several factors such as: past records of maintenance; water quality issues; anticipated service life of the facility; roadway maintenance schedule, etc. The recommended project is high priority due to the poor condition of the existing 12' cast iron water main installed in the micl-1950's and the benefits of completing the work prior to beginning the Vineyard Avenue resurfacing project scheduled for next summer. The project will improve water quality in the area by providing better blending of water sources. The project involves installing new fusible 8" and 12" PVC water lines on Vineyard Avenue between Adams Way and Bernal Avenue, replacing existing water service laterals and fire hydrant lines, and completing pipe line upgrades required for the Vineyard Avenue pump station. At the conclusion of the project, some of the residences along Mavis Drive, Ewing Drive, Vineyard Avenue and Zwissig Court now served in the lower zone will be served by the Bonde upper zone, which will result in increased water pressure at the street. Addressing this situation requires the installation of a pressure regulator and a new ball valve at each of the affected residences to control the water pressure entering the house. Staff is in the process of acquiring a pressure regulator installation agreement with each of the affected residences and will install the equipment at no charge to the owners. Completing this project requires soils testing which will be performed by ENGEO, one of the City's on-call soils testing consultants. The soils testing cost is estimated at $15,700. DISCUSSION Bids Sealed bids for this project were opened on December 17, 2012. A total of eleven responsive bids were received ranging between $498,603.30 and $752,877.00 (see Attachment 1, Bid Summary). The low base bid amount is approximately 91% of the engineer's estimate of$550,000. Page 2 of 3