05 - Laserfiche WebLink

DISCUSSION The upper Ruby Hills tank will have the interior and exterior coating systems replaced in addition to replacement and modification of access the ladders and replacement of the vents. The center column within the tank will be replaced, as well as other miscellaneous metal repairs. Finally, the cathodic protection system will be replaced. In order to remove the Ruby Hills tank from service, modifications to the Ruby Hills water pump station will be required. Specifically, valving will be installed within the pump station to bypass the reservoir tank, and one of the existing pump controllers will be replaced with a Variable Frequency Drive (VFD) in order to vary the speed of the existing pump based upon service area water demand in real time. In addition, a temporary 10,000-gallon water tank will be installed within the system to balance the pumping with the demand. These modifications will supply the domestic water needed during the low demand winter months. The temporary tank will be mostly screened by the existing berms around the reservoir tank and will have limited visual and sound impacts to the community. It is anticipated work will begin in late summer to install the temporary tank and valves, and it is possible that work will start on the exterior of the Ruby Hill tank (otherwise, the exterior coating work will take place in the spring). The interior work will begin around November 1, 2019, and be completed by March 15, 2020. The City's Engineering Department and Operations Services Department will closely coordinate the work to ensure no disruption to water service. To ensure all the work can be completed during the low-water-demand winter period, the working hours have been extended to 7 a.m. to 6 p.m., Monday through Friday, and 8 a.m. to 5 p.m. on Saturdays. The Moller and Laurel tanks will have the interior coating systems replaced in addition to replacement/modifications of access ladders, hatches, vents, and other miscellaneous metal repairs. The cathodic protection system at each tank will be replaced. Since the tanks are in the same hydraulic network, one tank can be taken out of service while the other tank meets the winter water demands. To ensure all the work can be completed during the low-water-demand time frame, the working hours have been extended to 8 a.m. to 5 p.m., Monday through Saturday. Dehumidification equipment will need to run 24 hours a day during each tanks interior surface preparation and coating phases of the project. The dehumidification system does create some noise, but the equipment must conform to the City's noise ordinance, and monitoring will occur to ensure that is the case. Bids Sealed bids for this project were opened on June 26, 2019. Two bids were submitted, the low bid was $1,730,706, and the second bid was $2,266,570. The low bid amount is approximately 10 percent lower than the engineer's estimate of $1.9 million (see Attachment 2). Past work performed by Olympus and Associates, Inc. was verified to be satisfactory. Staff recommends award of the construction contract to the lowest responsible bidder, Olympus and Associates, Inc., for $1,730,706. Page 3 of 5