Loading...
HomeMy WebLinkAbout05/05/2009, C1 - WATER RECLAMATION FACILITY: CLARIFIER 2 AND FACILITY MAINTENANCE PAINTING PROJECT; SPECIFICATION NO I council M °� May 5,2009 acEnaa upoM I"N CITY OF SAN LUIS OBISPO FROM: Jay Walter Public, Works Director JpW Prepared By: Bridget Fraser, Engineer III SUBJECT: WATER RECLAMATION FACILITY: CLARIFIER 2 AND FACILITY MAINTENANCE PAINTING PROJECT; SPECIFICATION NO. 90907 RECOMMENDATION 1. Approve the plans and specifications for "Water Reclamation Facility: Clarifier 2 & Facility Maintenance Painting Project, Specification No. 90907" and authorize staff to advertise for bids. 2. Authorize the City Manager to award the contract if the lowest responsible bid is within Engineer's Estimate of$220,000. DISCUSSION This project involves maintenance painting of four areas at the Wastewater Reclamation Facility (WRF). More specifically work will involve cleaning, surface preparation, and recoating of Clarifier No. 2, the adjacent pump island, the secondary recirculation pump island, and the below grade pump pit that houses the five (5) million gallons per day (MGD) pumps at the head works station. This project must occur during a time when flows at the facility are at their lowest. During low flow periods, one of the two primary clarifiers can be taken out of service and still be able to process incoming flows. Flows at the facility are lowest during the summer months when Cal Poly is out of session and the City's population is reduced. Most WRF projects are scheduled to occur during this time period. Clarifier No. 2 Coating Clarifier 2 was originally constructed in 1941 as part of the original treatment plant. The clarifier equipment and internal mechanisms were replaced in 1982 as part of an enlargement project. No major work or recoating has occurred on this clarifier since this time. After 27 years of service, the protective coatings on the walls and equipment are showing signs of deterioration. The deteriorated coatings need to be replaced to protect the underlying surfaces from deterioration and structural damage that would require costly repairs or replacement. Sacrificial anodes will be installed to provide added protection to the submerged mechanical equipment. This project also includes sealing of cracks between the clarifier tank and the perimeter gutter and smoothing of the clarifier walls to better prepare the surface for coatings. Facility Maintenance Painting As stated above, the original facility was constructed in 1941 with several major expansions occurring over the years. The facilities that were constructed over ten years ago are showing On — k Clarifier 2 and Facility Maintenance Painting Project Page 2 signs of rust and corrosion. This is not surprising due to the generally corrosive environment of the facility. Routine cleaning and recoating of the facilities is essential to slow the rate of corrosion and substrate deterioration. Recognizing this, WRF staff implemented an annual maintenance painting program to provide routine painting of these facilities. Areas in need of painting were identified and prioritized by WRF staff. The most critical areas will be addressed with this project. Bid Alternates-Award of Contract Timing of this project is critical. In order to complete the clarifier coating before students return mid-September the work must begin in early summer. However, if bids come in higher than expected requiring staff to return to Council for an award in July; work would not begin until the end of July. In this case, the contractor will not have enough time to complete the work before students return. To stay on track, it is essential that the City Manager award the contract as this would cutoff nearly a month of processing time allowing the work to begin the end of June or first of July. To accommodate this, two of the painting sites (the Secondary Island and the Pump Pit) are being bid as additive alternates to allow flexibility in awarding a. project. Staff recommends that the contract be awarded by the City Manager including or eliminating the bid alternates, as needed, to keep the award within the Engineer's Estimate of$220,000. CONCURRENCES The Utilities Department has reviewed and approved this project. FISCAL IMPACT The Clarifier coating project is identified in the 2005-07 Financial Plan on pages 110 to 112 of Appendix B where $120,000 is identified for coating of Clarifier 2 in the 2007-08 project list. The maintenance painting portion of the project is identified in the 2007-09 Financial Plan on pages 3-152 to 3-155 of Appendix B where $100,000 is identified for facility maintenance painting in the 2008-09 project list for a total budget of$220,000. The estimated project costs are shown below: Estimated Project Costs: Design $ 7,500 Printing/Misc. $ 1,000 Construction Costs: Clarifier 2 Coating& Repairs $ 170,000 Primary Island Coating $ 20,000 Pump Pit Coating (Add Alt.) $ 20,000 Secondary Island Coating(Add Alt.) $ 10,000 Total Engineer's Estimate $ 220,000 Contingencies @ 20% $ 44,000 Construction Management/Inspection @ 15% $ 33,000 Total Estimated Project Costs $ 305,500 Clarifier 2 and Facility Maintenance Painting Project Page 3 The estimated total project cost of$305,500 exceeds the budget of$220,000. For the most part this is due to costs for construction management, higher than normal contingencies (20% rather than 10% due to the high potential for unknowns), and the fact that the clarifier coating budget of $120,000 is low when compared with bids received a year ago for a similar coating project. However, given the competitive bidding climate, it is possible that bids could come in lower than the estimate. Due to the special nature of industrial coatings work and the anticipated heavy summer workload of City inspection staff, it is recommended that inspection and construction management be handled by Advantage Technical Services, one of the City's on-call inspection firms specializing in industrial coatings work. A work order for this work will be issued under their current contract. Funding for this project is available in the Water Reclamation Facility Major Equipment Replacement master account which has a current balance of$1,444,623. At time of award, funds will be transferred from the master account and two completed project accounts to this project's account via a budget amendment request. ALTERNATIVES Defer the Project. If corrosion is allowed to continue, the facility equipment and components will continue to deteriorate to the point of requiring more costly replacement or repair. ATTACHMENT Vicinity Map COUNCIL READING FILE Specifications [•.\council agenda neports\public works car\cip\90907 car adv cLuifier 2-painting.doc C � -3 jn • m"J j I �'� •� • CITY MAP I • `; t • CLARIFIER .. MAINTENANCE PAINTING PROJECT NO.SPECIFICATION = ..