Scope_of_Services_Backflow_Replacement.pdf
PDF 417 KB Posted
- Attached to
- DEVA- STRUCTURAL FIRE SYSTEMS REPAIR & ITM AND BAC Federal contract opportunity
- Solicitation number
- 140P8125Q0034
About this file
This Scope of Services document details a fire suppression backflow replacement project at Scotty's Castle in Death Valley National Park. The project requires a contractor to install a 6-inch Watts 757 OS&Y double check backflow preventer assembly in the historic tunnel's utility area, replacing existing infrastructure to improve potable water safety and prevent contamination. The work involves demolishing existing piping, modifying adjacent steel or ductile iron piping, providing seismic supports, labeling equipment, and conducting pressure and backflow testing.
The project has a 120-calendar day performance period and requires strict adherence to multiple codes and standards, including OSHA, AWWA, ANSI, and others. Contractors must follow specific guidelines for tunnel access, equipment use, and preservation of the historic site, including using rubber-tracked equipment, avoiding invasive species transport, and preventing damage to the tunnel's infrastructure. Key deliverables include an Accident Prevention Plan, tunnel access plan, backflow test results, photo documentation, O&M manual, and a final walkthrough with the Contracting Officer's Representative (COR).
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Text version
SCOPE OF SERVICES
FIRE SUPPRESSION BACKFLOW REPLACEMENT AT SCOTTY’S CASTLE
PART 1 – GENERAL
ITEM 1 – DESCRIPTION OF WORK
1.1 Background:
Scotty’s Castle, located within Death Valley National Park, is a historic mission-style compound featuring unique subterranean infrastructure. As part of ongoing e orts to improve potable water safety and infrastructure resilience, this project addresses the installation of a backflow prevention device to mitigate risks of contamination from reverse flow. The target work area is within the historic utility tunnel beneath Scotty’s Castle, specifically near the tunnel entrance where the main water line enters the structure. A picture of the current installation is below.
1.2 Work Covered by the Contract Documents:
The contractor shall furnish all labor, materials, supervision, equipment, and tools to complete the following work:
Provide and install one 6-inch Watts 757 OS&Y double check backflow preventer assembly with integral OS&Y shuto valves or approved equal, per AWWA M14, ASSE 1015, and USC FCCCHR specifications.
The installation will occur inside the Scotty’s Castle tunnel, near the tunnel entrance, adjacent to the incoming potable water main.
Demolish and remove any existing obstructions, failing valves, or redundant piping sections as necessary.
Modify or fabricate adjacent 6-inch schedule 40 steel or ductile iron piping to accommodate assembly, ensuring all cuts, welds, and fittings are made per IPC and SMACNA standards.
Provide pipe supports and seismic restraints compliant with SMACNA Seismic Restraint Guidelines for Mechanical Systems and California Building Code (CBC) anchoring standards.
Clearly label the backflow assembly and shuto valves in accordance with ANSI A13.1.
Conduct pressure testing and obtain backflow certification by a California-licensed backflow tester. Submit certified test reports to the COR.
Remove debris and ensure historic fabric of the tunnel is not impacted. Coordinate all coring and penetrations with COR to avoid sensitive structural or historical features.
Period of Performance:
Work shall be completed within 120 calendar days from the award of contract, including 5 weather contingency days.
ITEM 2 – EXISTING UTILITIES
Confirm potable water main routing inside the tunnel prior to cutting or tapping operations.
Coordinate with park utility manager or COR for verification of outside utility connections.
Any utility damages shall be reported and repaired immediately at contractor’s expense.
ITEM 3 – CONTRACTOR’S USE OF PREMISES
Contractor shall access the tunnel entrance using park-authorized routes. No unapproved staging or storage within the historic grounds.
Use only rubber-tracked or low-PSI equipment where transit over sensitive grounds is required.
No open flames or fuel storage in the tunnel.
ITEM 4 – SERVICES REQUIRED
The services required under this contact include:
A: Replace the backflow and supports according to the manufacturers’ recommendations all relevant codes per section 1.2
ITEM 5 – ABBREVIATIONS
Applicable codes and standards include:
OSHA 29 CFR 1926
AWWA M14, ASSE 1015
IPC, UPC, IBC
SMACNA
NECA
ANSI A13.1
UL 1479
NFPA 13, 99
ITEM 6 – ACCIDENT PREVENTION
Submit Accident Prevention Plan (APP) with emergency response procedures, and tunnel-specific JHA.
ITEM 7 POST-AWARD CONFERENCE
Contractor shall attend preconstruction meeting with draft schedule, APP, and submittal register.
ITEM 8 – SUBMITTALS
Provide cut sheets for Watts 757 assembly, pipe supports and anchoring materials.
Submit tunnel access plan and backflow test results signed by a certified tester.
ITEM 9 – TEMPORARY SERVICES
Provide tunnel lighting and generator-based power if needed. Secure all cords and hoses.
ITEM 10 – PROJECT CLOSEOUT
Submit certified backflow test results, as-builts, equipment labels, warranty documents, and photo documentation.
Final walkthrough with COR required. Punch list items must be completed within 10 days of issuance.
PART 3 – EXECUTION
Phase 1 – Mobilization:
Deliver equipment via designated route. Clean all tools to avoid transporting invasive species. Secure tunnel access per park procedures.
Phase 2 – Demolition/Preparation:
Isolate water line and relieve pressure. Remove or cut existing piping to receive new assembly.
Phase 3 – Installation:
Mount Watts 757 assembly or equivalent per manufacturer specifications using flanged joints and torque-rated hardware.
Anchor unit to pad using stainless steel seismic-rated anchors.
Test alarm control systems.
Tag piping and install directional flow signage per ANSI A13.1.
Perform hydrostatic pressure test to 150 psi for 2 hours and backflow performance test by certified tester.
Phase 4 – Restoration & Cleanup:
Patch any wall/floor openings with fire-rated sealants (UL 1479).
Clean tunnel work area, remove debris, and restore lighting and ventilation conditions.
Verify no damage to tunnel wall or historic infrastructure.
Phase 5 – Inspection & Documentation:
Conduct joint inspection with COR using NPS punch list protocol.
Provide photo log, test reports, and as-builts for closeout documentation.
Submit O&M manual and conduct brief training for park maintenance sta .
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