Inspection Services Perform in-service inspections using ROVs or divers trained in potable water operations. Provide detailed reports including high-resolution video, photographs, and condition assessments. The inspection should be focused on documenting findings related to the following criteria and standards and shall document in the report any OSHA, Cal-OSHA, AWWA, California State Water Resources Control Board and NFPA-22 compliance discrepancies related to the reservoirs. Generally, all reservoirs shall be inspected for condition of floors, walls, roofs, ladders, hatches, welds, vents and screens, inlets, outlets, interior piping, diffusion systems and flaps, overflow structures, cathodic protection systems, and potential points and sources of contamination. For welded steel tanks, interior coatings are also to be inspected for conditions including, but not limited to, peeling, blistering and other indications of loss of coating integrity. Any areas of pitting or rust, as well as any associated undercutting or migration, should be documented in the final report. A representative pit and blister survey shall be conducted. Interior pitting depth measurements, to 10 mils accuracy, shall be reported by location and character. A non-destructive thickness test shall be performed to establish the dry film thickness (DFT) of installed coating systems. DFT sampling shall be performed on various surfaces of the reservoirs, paying particular attention to obvious or suspected deficient or degraded areas. Representative readings (location and findings) from accessible areas of the interior and exterior coating shall be provided in the final report. Welded steel tanks shall also be inspected for chime corrosion and findings reported. For concrete tanks, interiors shall also be inspected for conditions including cracking, spalling and exposed reinforcement. Any areas of identified or suspected leaking should be documented in the final report. All findings are to be graded in accordance with the applicable standards from the following agencies: • Coatings - Society for Protective Coatings, ANSI/SSPC VIS 2-82/ASTM D610- 85 • Corrosion - National Association of Corrosion Engineers, ASM/NACE RPO178- 91- A,B,C • Welds - American Welding Society, ANSI/AWS B1.11:2000 • Concrete - American Concrete Institute, ACI 201.1R-92. Cleaning Services Remove accumulated sediment, biofilm, and debris without draining the reservoir fully. Ensure compliance with AWWA C652 – Disinfection of Water-Storage Facilities. The contractor shall provide the procedure, labor, equipment and supplies necessary to thoroughly remove accumulated sediment and debris from the reservoirs in a manner that does not compromise the tank integrity and/or coating system. The work shall not cause disruption to the use or quality of the water. • The reservoir shall remain in operation while the cleaning is in progress. The operation shall not require draining of the reservoir. Lowering of water level up to forty percent (40%) is permissible with prior approval from the City. • The total price entered on the Cost Summary/Bid Worksheet shall include up to one (1) hour of sediment/debris removal from each reservoir. An hourly rate for sediment/debris removal in excess of one hour per reservoir shall be provided in Appendix B. Should sediment/debris removal exceed one (1) hour per reservoir, the City will be notified, and a signed authorization will be obtained to proceed prior to the City incurring any additional cost. Maintenance and Repair Services Provide minor repairs including Coating touch-ups, patching, and sealing Replacement or repair of hatches, vents, screens, and ladders. Spot coating repair shall be performed where appropriate in accordance with AMPP (Association for Materials Protection and Performance) Standard and guidelines. Coating shall be AquataPoxy A-6, A-6 Thick, A-61, or approved equal, applied in accordance with manufacturers recommendations. Cost estimates for more substantial repairs shall be provided to the City and approved prior to performance of work. All repairs shall be made in accordance with applicable standards. The total price entered on the Cost Summary/Bid Worksheet shall include one (1) hour of spot repair for each reservoir. An hourly rate for repair work in excess of one hour per reservoir shall be provided in Appendix B.
