Attach_2_-_Combined_Plans_and_Inspection_Report.pdf
PDF 17 MB Posted
- Attached to
- RECOAT LAS VEGAS BAY RAW WATER TANK
- Solicitation number
- 140P8124B0003
About this file
This document appears to be an Attachment 2 - Combined Plans and Inspection Report, related to the federal contract opportunity for Recoating the Las Vegas Bay Raw Water Tank at Lake Mead National Recreation Area in Nevada. The key details are as follows:
The contract opportunity is solicitation number 140P8124B0003, issued by the Department of the Interior National Park Service Pacific West Region. The requirement is to recoat the Las Vegas Bay raw water tank. The document provides the combined plans and inspection report for this tank recoating project. It includes details on the tank inspection, necessary repairs, surface preparation, coating system, quality control, and safety requirements. The document appears to be a technical specification or performance work statement outlining the detailed scope of work and standards for the tank recoating services required under this contract opportunity.
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Text version
E-mail david@potabledivers.com
Andy Johnson Dive Supervisor
Potable Divers Inc.
PO Box 474
Vernal, UT 84078-0474
Phone: (866) 789-3483
Facilities Management and Engineering
National Park Service, Interior Region 8
Phone: 702-293-8984
Submitted By:
Potable Water Storage Tank
Submitted To:
Lake Mead National Recreation Area H. Scott Bell
Las Vegas Bay
Field Report 20-Jan-23
Underwater Cleaning and Inspection
Concrete Storage Tank
Concrete
Satisfactory Y X N
Earth Covered Y N X
Cracking Y X N
Efflorescence Present Y N X
Spalling Y N X
Scaling Y N X
Exposed Aggregate Y N X
Strength Members
Exposed Y N X
Seams/Joints Good condition
Low Areas No
Conclusion/Discrepancies: The Exterior roof has
Extensive superficial cracks.
Satisfactory Y X N
Construction Aluminum
Coating
Corrosion Y N X
Proper Design Y X N
Locked Y X N
Gasket Y X N
Hinge
Hatch Size 3 FT X 5 FT
Conclusion/Discrepancies Both hatches and gaskets are in good condition.
Satisfactory Y X N
Construction Steel
Coating
Corrosion Y X N
Proper Design Y X N
Screens Y X N
Sealed Edges & Seams Y X N
Cap/Cover Y X N
Conclusion/Discrepancies Screen and vent are in good condition. Minor surface corrosion noted.
EXTERIOR ROOF
ACCESS HATCH
VENTS
Earth Embanked Y X N
Cracking Y X N
Efflorescence Present Y X N
Spalling Y N X
Scaling Y N X
Exposed Aggregate Y N X
Strength Members
Exposed Y N X
Seams/Joints Good condition
Honeycombing Y N X
Conclusion/Discrepancies: The shell is partially earth embanked. Shell is in good condition one small crack with efflorescence prersent.
Construction None
Satisfactory Y N
Coating
Satisfactory Y N
Oxidized Y N
Pitting Y N
Delamination Y N
Corrosion % Y N
Welds/Joints
Supports
Safety Cage/Climb Y N
Conclusion/Discrepancies No exterior ladder.
Coating PVC
Satisfactory Y X N
Oxidized Y N
Pitting Y N
Delamination Y N
Corrosion % Y N X
Welds/Joints
Supports
Screens Y X N
Attachments
Foundation Good condition
Conclusion/Discrepancies Overflow and outfall are in good condition.
OVERFLOW STRUCTURE
EXTERIOR SHELL
EXTERIOR LADDER
Cracking Y N X
Spalling Y N X
Exposed Aggregate Y N X
Erosion / Undermining Y N X
Seismic Restraints None
Corrosion Y N
Tight Y N
Conclusion/Discrepancies Foundation is in good condition no issues noted.
Locations
Coating
Satisfactory Y X N
Oxidized Y N
Pitting Y N
Delamination Y N
Corrosion % Y N
Welds/Joints
Conclusion/Discrepancies
No other man way entires other than the roof access
FOUNDATION
MANWAY ENTRIES
Cracking Y N X
Efflorescence Present Y N X
Spalling Y N X
Scaling Y N X
Exposed Aggregate Y N X
Strength Members
Exposed / Corrosion Y N X
Seams/Joints Good condition
Honeycombing Y N X
Vent Penetration Good condition
Roof Hatch Good condition
Conclusion/Discrepancies: Roof is in good condition no issues noted.
Concrete
Satisfactory Y X N
Cracking Y N X
Efflorescence Present Y N X
Spalling Y N X
Scaling Y N X
Exposed Aggregate Y N X
Strength Members
Exposed / Corrosion Y X N
Seams/Joints Good condition
Honeycombing Y N X
Wall to Roof Seam Good condition
Baffle/Support Walls None
Conclusion/Discrepancies: The shell is in good condition no issues noted. Exposed rebar that is cosmetic.
Construction none
Satisfactory Y N
Spalling Y N
Cracking Y N
Scaling Y N
Honeycombing Y N
Coating Y N
Corrosion % Y N
Seams/Welds
Floor/Base Plates
Conclusion/Discrepancies:
INTERIOR ROOF
INTERIOR SHELL
SUPPORT COLUMNS
Cracking Y N X
Efflorescence Present Y N X
Spalling Y N X
Scaling Y N X
Exposed Aggregate Y N X
Strength Members
Exposed / Corrosion Y N X
Seams/Joints Good condition
Honeycombing Y N X
Floor to Wall Seam Good condition
Conclusion/Discrepancies: The floor is in good condition no issues noted. Sediment depth on average was 1/16 inch
Coating
Satisfactory Y X N
Blistering Y N
Cracking Y N
Peeling Y N
Holidays Y N
Pitting Y N
Corrosion % Y N
Seams/Welds
Conclusion/Discrepancies: No manway entries besides the roof entry hatch.
Construction Steel
Satisfactory Y X N
Coating
Satisfactory Y X N
Blistering Y N X
Cracking Y N X
Peeling Y N X
Holidays Y N X
Pitting Y N X
Corrosion Y N X
Seams/Welds Good conditrion
Safety Cage/Climb Y N X
Conclusion/Discrepancies: No issues noted.
Coated steel ladder.
FLOOR
MANWAY ENTRIES
LADDER
Influent
Construction Steel
Coating
Satisfactory Y X N
Blistering Y N X
Cracking Y N X
Peeling Y N X
Holidays Y N X
Pitting Y N X
Corrosion 10% Y X N
Seams/Welds Fair condition
Conclusion/Discrepancies: The inlet has corrosion.
Effluent
Construction Steel
Coating
Satisfactory Y X N
Blistering Y N X
Cracking Y N X
Peeling Y N X
Holidays Y N X
Pitting Y X N
Corrosion 20% Y X N
Seams/Welds Fair condition
Conclusion/Discrepancies: Outlet has corrosion and moderate pitting.
Drain
Construction Steel
Coating
Satisfactory Y X N
Blistering Y N X
Cracking Y N X
Peeling Y N X
Holidays Y N X
Pitting Y X N
Corrosion 25% Y X N
Seams/Welds Fair condition
Conclusion/Discrepancies: Corrosion with moderate pitting.
APPURTENANCES
Location Entry point
Coating
Satisfactory Y X N
Blistering Y N X
Cracking Y N X
Peeling Y N X
Holidays Y N X
Pitting Y N X
Corrosion 10% Y X N
Seams/Welds Fair condition
Conclusion/Discrepancies: Funnel and flange have surface corrosion.
Based on the results of this underwater inspection and the cleaning which took place, it appears this tank is in full operational condition and should continue to provide a reliable water storage capacity for potable water use with proper maintenance.
PDI concurs with the recommendations of AWWA that all potable water reservoirs or storage tanks be cleaned and inspected at least every five years and in some cases, depending upon source waters, type and quantities of sediment, and presence (or lack thereof) of cathodic protection systems, more frequently.
The following recommendations are made to provide continued, uninterrupted service of your water storage tank:
1 Your tank should be inspected and cleaned every five years, as suggested by the AWWA.
Routine inspections and cleanings provide ample time to perform remedial repairs to abnormalities discovered before having a chance to become problematic.
2 Roof has extensive superficial cracks Recommend applying a coating on the exterior of the roof to prevent water from traveling into the cracks and corroding the rebar that could cause interior spalling of the concrete.
3 Both tanks are in good condition interior recommendation is to install sacraficial anodes to the inlets, outlets and drains of both tanks.
Conclusion
Recommendations
OVERFLOW
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