05 - Laserfiche WebLink

the design and prepare biddable construction documents, increasing the total task authorization amount from $74,480 to $111,395. DISCUSSION The designed system will divert recycled irrigation water collected in the underdrain system to the sanitary sewer for treatment at the DSRSD plant and not be discharged to the Alamo Canal as required by the State Water Board. The system design includes valving that will allow the underdrain system to discharge to the storm drain outfalls during the wet weather season when the irrigation system is disabled. This valving will avoid the expense of sending stormwater to the DSRSD plant for treatment. The work includes the installation of approximately 1,510 linear feet of new 8-inch gravity flow recycled water pipe by open trench and horizontal directional drill operations, 14 new manhole structures, two recycled water package pump stations with electrical and controls systems, and approximately 630 linear feet of new 2 and1/2-inch PVC recycled water force mains by open trench. The project will also rehabilitate four concrete storm drain outfalls, including approximately 580 linear feet of existing 18- to 48-inch diameter corrugated metal storm drainpipe using cured-in-place pipe liner. Since the work must occur during the dry season, at the same time the park is most heavily used, how the work impacts the park's usage was considered during the design. Open-cut trenching for the pipe installation is allowed in less heavily used park areas for cost control reasons, but directional boring of pipelines is required by the plans to minimize impact to heavily used park areas. As designed, it is anticipated that there will be minimal impacts on the Val Vista Community Park's daily field usage during construction. The contractor will be restricted to working within the fields until 3:30 p.m., Monday through Friday, unless otherwise approved by the City Engineer. The soccer fields will be utilized after 3:30 p.m. by the public and all fenced work areas will be secured by 3:30 p.m. The contractor will not be allowed to work on Fridays during the 2023 sports tournament season at Val Vista Community Park. Bids Sealed bids for this project were opened on December 9, 2022. A total of nine bids were submitted, but due to anomalies on the bid proposal sheet from one bidder that affected both a unit cost and the total cost, it was not possible to determine their intended bid amount and therefore their bid was deemed non-responsive and rejected. The eight responsive bids range from the low bid amount of$1,561,960.50 from Golden Bay Construction, Inc. to a high bid of$2,184,624. The low bid is approximately 11 percent lower than the Engineer's Estimate of$1,747,480 (see Attachment 2). Past work performed by Golden Bay Construction, Inc. has been verified to be satisfactory. Staff recommends awarding the construction contract to Golden Bay Construction, Inc. Consultant/Specialty Services Under an existing on-call contract with the City, Pakpour Consulting Group, the project designer, will be providing construction support services to review shop drawings, respond to requests for information, and periodic inspections. The task authorization for construction support services is estimated to cost $74,927, but payment will be made based on time and materials. Page 3 of 4