Mechanical and Electrical

TRAILER 1888 HVAC REPLACEMENT

  • Client: Lawrence Livermore National Laboratory
  • Location: Livermore, CA
  • Date: 2017
  • Contract #: B623475
  • Value: $390,860

Project Details

Trailer 1888 at Lawrence Livermore National Laboratory is divided into north and south sides.  This scope of work was to replace the AC units on the rooftop of T1888 south building, and to provide air balancing of both the north and south side AC units (the north AC units had been replaced under a separate contract).  Nine existing rooftop AC units (heat pumps) were removed.  The units were delivered via crane tightly wrapped from the roof to the laydown area to prevent asbestos containing material on the unit and their sleepers, and the units’ refrigerant from becoming friable or escaping into the atmosphere.

Eight new owner-furnished AC units and their curbs were transported to the roof by crane, curbs set and units installed.  The client provided all roof patching.  A roof platform was built and a disconnect switch frame was constructed to service the new units.  New supply and return branch ductwork with grilles and diffusers was installed above the ceiling inside the trailer.  Penetrations were cut through the existing glulam roof beams to accommodate the new duct runs.  New operable thermostats were installed, programmed and configured for the new roof units.

DESIGN BUILD GENERATOR REPLACEMENT

  • Client: Lawrence Livermore National Laboratory
  • Location: Site 300, San Joaquin County CA
  • Date: 2018
  • Contract #: B623062
  • Value: $321,402

Project Details

Lawrence Livermore National Laboratory required a new permanent engine generator and automatic transfer switch (ATS) for their mission critical Building 836 at Site 300.  This project was for the design, purchase and installation of the generator and ATS.

The new generator and ATS were secured to new housekeeping pads in the courtyard between Buildings B836A and B836B.  Site and utility alterations required to accommodate these new pads were designed and implemented.  Power, controls and lease line conduits and cable were extended as necessary to accommodate the new layout.

The 125k generator is a diesel engine-driven alternating current assembly with integral fuel tank built by Cummins Power Systems, designed for automatic remote operation with a weatherproof enclosure.  The Cummins automatic transfer switch is a heavy-duty, industrial-type, 3-phase, 4 pole automatic power transfer and bypass isolation switch.  It is designed to automatically provide continuous electrical power from the emergency generator during failure of the normal utility power supply, and capable of bypassing the power from the live source or engine-driven generator set to the load in the event the transfer switch is disabled.

Prior to placement of the new generator and ATS, pull boxes and conduit were installed inside the building.  After placement, final conduit connections were made, wires pulled and generator frame bonded.  An electrical outage for cutover from existing temporary generator to new emergency generator was initiated and power diverted to the new generator set.  The generator and ATS were commissioned, and Lab personnel trained on the equipment.

LAWRENCE LIVERMORE NATIONAL LABORATORY, BUILDING 391 GENERATOR REPLACEMENT

  • Client: Lawrence Livermore National Laboratory
  • Location: Livermore, CA
  • Date: 2017
  • Contract #: B624015
  • Value: $243,096.50

Project Details

The owner required a new permanent generator for this mission critical building. The existing generator was removed by crane to a flatbed truck and transported to a holding area. A new housekeeping concrete slab was constructed at the site of the existing generator. Work included all site and utility alterations necessary to accommodate the new generator footprint and utility layout requirements. This included extension of associated power, control and lease line conduits and cable. Modification No. 2 was issued to install additional electrical underground conduits for exterior lighting, rerouting of designed conduit runs and additional trench pull boxes and associated equipment. The new 150kW generator, supplied by the owner, was installed on the new housekeeping pad. The building’s temporary generator was required to remain operational during construction.

US COAST GUARD SECTOR SAN DIEGO – COMMS ROOM HVAC SYSTEM REPLACEMENT

  • Client: US Coast Guard
  • Location: San Diego, CA
  • Date: 2016
  • Contract #: HSCG88-16-J-PQQ113
  • Value: $186,081

Project Details

Cerrudo replaced the HVAC system supporting the COMMS Rooms at Sector San Diego, Building F. Phasing of the demolition and installation of the units was required in order to maintain continuous server operation throughout the construction schedule. Structural design of new roof sleeper supports and anchoring for the two new AC units was provided.

There were two existing roof-top HVAC units, AC-3 and AC-4. Unit AC-3 which was already out of service was removed first, along with associated refrigerant lines back to the roof mounted condensing unit. The power feed was demolished back to the electrical panel. The condensing unit was then removed along with the supply air fan and associated ductwork. The wall penetration was sealed.

New roof sleeper supports for the two new AC units were installed, with seismic anchoring. Two new 3-ton, cooling only, packaged roof-top AC units, variable stage compressors and condensate piping were installed along with horizontal supply/return duct connections. Common supply ductwork from the new roof-top units to the raised communications room floor inside the building was installed. Ceiling return grilles and manifold were installed to the common return duct. The return main was routed through the roof and manifold to each AC unit.

US COAST GUARD NOVATO HOUSING BUILDING 227 BOILER REPLACEMENT

  • Client: US Coast Guard
  • Location: Petaluma, CA
  • Date: 2016
  • Contract #: HSCG88-16-J-PQQ2337
  • Value: $103,597

Project Details

Cerrudo Services served as the prime contractor to Betance Enterprises, Inc. on this project. Betance, as a service-disabled veteran enterprise, holds the RMACC contract for the US Coast Guard with Cerrudo Services performing all work located in Northern California. Cerrudo’s responsibilities include management, invoicing, project controls, submittals, quality control and executing the work. Cerrudo Services has completed over 40 task orders on this current contract for Betance on this contract.

Cerrudo Services replaced an existing hydronic boiler with a new energy efficient hydronic boiler in Novato Housing Building 227 at Novato, California. The existing boiler materials were tested for lead and asbestos. It was found that the pipe flange gaskets contained asbestos. After establishment of negative pressure containment, the gaskets were removed by wet methods using hand tools and scrapers. Half mask respirators and coveralls were worn during removal and disposal of the material. Asbestos containing materials were place in leak tight poly bags, properly labeling, transported to Hay Road Landfill in Vacaville and disposed of as friable asbestos waste.

Cerrudo provided a new energy efficient boiler and associated components. Existing piping was modified to support the new boiler. A hydrostatic pressure test was performed for the new piping sections and boiler. An equipment startup service for the new boiler was provided.

US COAST GUARD AIR STATION SACRAMENTO – REPAIR EXTERIOR LIGHTING

  • Client: US Coast Guard
  • Location: McClellan AFB. CA
  • Date: 2017
  • Contract #: HSCG88-17-J-PQQ022
  • Value: $237,050.70

Project Details

Cerrudo Services replaced the exterior lighting system of the tarmac, wash rack and exterior of the building hangar at US Coast Guard Air Station Sacramento. Two roof pedestal mounted type A luminaires were replaced at four locations. Wall pack type B luminaires were replaced at six locations. Sixteen pole mounted type M luminaires were replaced at six locations. All photocells were replaced.

REPLACE TRANSFORMER – US COAST GUARD TRAINING CENTER

  • Client: US Coast Guard
  • Location: Petaluma, CA
  • Date: 2016
  • Contract #: HSCG88-16-J-PFPR01
  • Value: $60,529

Project Details

Cerrudo Services removed a 225 kVA, three phase transformer and replaced with a new 225 KVA three phase transformer. The line side conductors were reused.  Secondary conductors from transformer to transfer switch were resized along with conductors from the transfer switch to the breaker.  Additional neutral conductors were provided from the transformer to the transfer switch for future generator back feed connection.  The 800A breaker line and load side conductors were reconnected.  Temporary generator connections were disconnected upon successful replacement of the transformer.

HEATING SYSTEM UPGRADE – US COAST GUARD STATION BODEGA BAY

  • Client: US Coast Guard
  • Location: Bodega Bay, CA
  • Date: 2015
  • Contract #: HSCG88-14-J-PQQ166
  • Value: $437,000

Project Details

Cerrudo Services provided repair, replacement and protection of electrical and water utilities from the shore to the existing floating dock and the replacement of an existing boiler and the addition of heating and ventilation to all occupied spaces at Coast Guard Station Bodega Bay.  A new heat exchanger was installed to provide fresh air above the new boiler in the mechanical room.  Fourteen hydronic radiators were installed throughout the building.  The water heater was replaced.

Conflicts existed between the plans and specifications.  One major conflict involved the new boiler and pump.  The required design operating performance characteristics provided in the equipment schedule on the plans were at odds with the specification requirements for a pump construction.  The specifications required pump construction characteristics found in larger capacity pumps that are not available in the designed-required pump capacity and horsepower.  It was resolved that the operating characteristics provided in the equipment schedule would be utilized as the defining equipment selection and installation criteria.

During construction it was discovered that the existing sewer piping and floor drains in the mechanical room required replacement.  The existing floor slab was demolished and the sewer piping, cracked vent line, sewer cleanout, floor drain, P-trap and associated piping were replaced.  After backfilling, the concrete slab was replaced.

REPLACE TRANSFORMER – US COAST GUARD AIR STATION SAN FRANCISCO

  • Client: US Coast Guard
  • Location: San Francisco International Airport
  • Date: 2016
  • Contract #: HSCG88-16-J-PQQ092
  • Value: $95,331

Project Details

The existing 250 kVA pad mounted transformer was removed and replaced with a new 250 kVA transformer.  The new transformer arrived on site on a flatbed truck through the helicopter gate, parked on the side of the tarmac where it would not interfere with Coast Guard operations.  A section of trellised privacy fence adjacent to the transformer pad was temporarily removed.  The circuit to the existing transformer was de-energized and secondary breaker wires and panel removed.  A forklift lifted the existing transformer from the pad and set the transformer on the flatbed truck.  The new transformer was lifted from the truck and transported to and placed on the pad.  Secondary breaker and wire were installed and the primary 15 Kv wire re-connected.  The circuit was re-energized and the transformer tested.  As part of the work, the underground secondary electrical feeder from the transformer to the main switchboard was removed and replaced.

US COAST GUARD TRAINING CENTER – DESIGN BUILD REPLACEMENT OF BASE WIDE FIRE ALARM

  • Client: US Coast Guard
  • Location: Petaluma, CA
  • Date: 2014
  • Contract #: HSCG88-13-J-PFP000
  • Value: $2,941,442

Project Details

Cerrudo Services is providing the design and installation to replace the Base Wide Fire Alarm at the US Coast Guard Training Center.  The current fire alarm system is unreliable and requires replacement because of its age.  The work encompasses 38 buildings and includes 23 new fire alarm control panels with new radio communications interface, 15 new radio communications interface with existing panels, new smoke and heat detectors, duct detectors, unit flow switches, pull stations, horns and strobes and addressable relay monitor modules.  A central station supervisor system is being installed at new Police Building 230.

The new design required investigating all the spaces in the different buildings to verify that the existing fire alarm installation matched the existing as-built drawings.  Existing drawings with detailed site investigation data were compiled to provide a comprehensive and accurate new fire alarm design.  The design of the new system included fire alarm panels, all input and output devices, device wiring, radio interface, floor plans showing locations of fire alarm devices, panels and radio systems.