Project Details
Design & Build
Yerba Buena Island, San Francisco, CA
Client: United States Coast Guard
Project Size: $5M – $10M
Design & Build
New Boat Maintenance Building and Facilities Renovations
Project Description
This design-build project had a varied scope which included the construction of a new Boat Maintenance Building and renovation of seven existing buildings at the US Coast Guard Station, Yerba Buena Island (YBI) located in San Francisco, CA. The overall square footage of this project was 100,000 SF. Sergent Construction (SC) reworked every major system in each of the renovated buildings including mechanical, electrical, heating, ventilation, air conditioning (HVAC), and communication links (COMM). Basic renovations for each facility also included all finish work. Infrastructure elements associate with these facilities included a series of new HVAC systems and various COMM systems upgrades including the installation of associated state-of-the-art communications and data systems. In addition to each building renovations, all associated sewage lines, storm drain lines, and gas and water lines were upgraded.
A new 4500 square foot Boat Maintenance Building was also constructed. The new two-story masonry building had maintenance bays, tool rooms, supply areas, a weapons storage vault, restrooms, an elevator, office space, a kitchen, and electrical/mechanical rooms. The HVAC system for this building was hydronic and involved a boiler, chiller, pumps, piping, fan coils, and controls. A completely new 480-volt electrical service was installed in this building along with state-of-the-art communication and data systems.
This new construction and all associate renovations were designed and built to California’s stringent Title 24 requirements which the US Green Building Counsel has implemented into their LEED certification process.
The project also consisted of the following site work: underground utilities such as installation and termination of 600 pair COMM cable, storm drain extension, installation of underground electrical distribution, earthwork, and site clean-up. An existing cast-in-place concrete structure was also demolished. In place of the demolished structure, we installed two pre-engineered haz-mat storage containers which included fire suppression, eye wash stations, explosion proof electrical connections, and fire alarm systems.
A complete gutting and renovation of the existing gymnasium and locker rooms was done in Buildings 1 and 21. The new locker rooms were brought up to current code requirements, showers and restrooms were renovated and enlarged, and locker room furnishings were installed. A new epoxy coated floor was also installed in the locker rooms with rubber flooring being installed in the gymnasium.
Buildings 24 and 26 were originally dormitories. This project areas involved converting the dormitories into modern office facilities. Work in these areas included complete renovation of the restrooms, the addition of kitchen areas, and opening of individual rooms to provide for larger office space areas. This included the installation of state-of-the-art communications and data systems and the installation of new HVAC systems including new boilers, chillers, circulating pumps and piping, fan coil units, and controls. Existing railings were modified on the two-story buildings and several stairs were constructed to allow access to these renovated facilities. Work in the Command Center involved installation of an STC 50 rated wall, removal of an existing spiral staircase, installation of a more traditional staircase, new paint, carpet, and storefront entries.
On this design-build construction contract, Sergent Construction (SC) acted as the general contractor overseeing construction as well as self-performed the following trades: earthwork, storm drain installation, sewer line tie-ins, water main tie-ins, mechanical, HVAC, demolition, carpentry, framing, plumbing, drywall, and painting. On this project, Sergent Construction self-performed 75% of this project’s work.
Defense Distribution Depot San Joaquin Playground Upgrade Project
Project Details
Design & Build
DDJC Tracy, CA
Client: Defense Logistics Agency
Project Size: $0M – $2M
Project Description
This design-build project scope of work involved the design and construction of a new playground at the Child Development Center located at the Defense Distribution Depot San Joaquin, Tracy, CA. On this design-build project, Sergent Construction (SC) acted as the General Contractor and managed both the design and construction phases.
This project included the expansion and renovation of the existing 20,000 SF accessible playground at DDJC’s Child Development Center. The project’s scope of work included the installation of playground equipment, concrete pads, concrete walkways, shade structures, premanufactured storage building, sod, landscaping, fencing, irrigations system, and pavement markings. Furthermore, all playground slabs were covered in 4” of poured in place rubber in accordance with the critical fall height requirements defined in the UFC design standards.
A list of the construction trades involved in this project were as follows:
- Concrete: Place reinforced concrete slabs and walkways.
- Poured in Place Rubber: Place 5,000 SF of poured in place rubber on all new playground CIP slabs.
- Site Work and Demo: Removed existing decomposed granite. Trench, install, and backfill drain lines and water line. Rough grade site & prepare for landscaping
- Playground Equipment: Fabricate and install accessible playground equipment
- Pre-Manufactured Building: Manufacturer and install pre-manufactured storage building.
On this design-build construction contract, Sergent Construction acted as the general contractor and self-performed the following trades: earthwork, storm drain installation, water main tie-ins, and demolition. In total, SCS self-performed 85% of this project’s work.
Wastewater Treatment Plant Repairs
Project Details
Design & Build
Petaluma, CA
Client: United States Coast Guard
Project Size: $0M – $2M
Project Description
This design-build construction project involved providing civil engineering as needed to complete a design for reworking an existing wastewater treatment plant. On this project SC acted as the general contractor. The design encompassed engineering for: grading, earthwork, reworking wastewater piping, construction of roads, and the installation of a new pond liner.
The existing wastewater pond had filled with sludge and become very shallow. This pond was originally installed some time ago and did not have a liner. This presented significant environmental problems as sewage was seeping into the water table.
Work included draining the pond, scarifying and drying the sludge, and removal of the sludge. In addition, the pond was excavated to make it deeper, the levee slopes were re-graded, and a new inlet piping and HDPE pond liner were installed.
Repair Building 2800
Project Details
Design & Build
Edwards AFB, CA
Client: US Air Force
Project Size: $2M – $5M
Project Description
This design-build construction project involved the complete gutting and remodeling of the interior and exterior of a 1950’s 44,000 square foot, single-story CMU building. The scope of work covered the installation of all new utility services including medium voltage electrical service, water, gas, communications, data, and sewer. The building’s exterior concrete masonry received a new energy efficient EIFS finish. Work also included major landscaping upgrades including a new courtyard entrance. Enhanced paths and gardens were also created while maintaining a desert motif.
Interior renovations included complete gutting which involved asbestos and lead abatement as well as seismic modifications to the existing building structure. Work also included installation of all new mechanical, electrical, communications, data, fire detection, and fire protection systems. A new HVAC system included a new chiller, boiler, and fan coil units. An entirely new plumbing system and restroom configuration was installed which involved concrete floor removal and replacement and the installation of new water piping and waste lines. The new interior electrical system included installation of power distribution, and lighting panels throughout the building. The new floor plan configurations required the installation of framing and gypsum board partitions, new frames/doors, and hardware, and interior finishes throughout
This project included installation of a new communications and data systems that involved tying into the street utilities and installing a 600 pair copper communications cable and fiber optics to various communications/data rooms throughout the building. This project included the installation of a new fire main, riser, and distribution system to protect the building from fire. In addition, an entirely new fire detection/reporting system was also installed throughout the building to ensure occupant safety.
On this design-build construction contract, Sergent Construction acted as the general contractor.
PSU Stonerock Barracks Renovation
Project Details
Design & Build
San Francisco, CA
Client: United States Coast Guard
Project Size: $0M – $2M
Project Description
This design-build project had a varied scope of work. The interior work encompassed an area of 27,000 square feet and the exterior work encompassed an area of approximately, 50,000 square feet for a total of 77,000 square feet. Similarities of this project and the anticipated project are the physical size and the scope of work involved. This project involved interior framing, drywall, finishes, installation of completely new electrical, HVAC, plumbing, COMM systems. Exterior work involved earthwork, water line work, sewer system work, gas line installation, paving, concrete, and landscaping.
On this project SC acted as the General Contractor as well as self-performed the following trades: earthwork, storm drain installation, sewer line tie-ins, water main tie-ins, mechanical, HVAC, demolition, carpentry, framing, plumbing, drywall, and painting.
This project presented a unique challenge to design and build a usable building from a structure that had been abandoned for 21 years old and in terrible disrepair. The roof of the building was not structurally sound and had many leaks, which caused interior damage and mold. The gas piping which serviced the building had rusted and required replacing. Upon completion, we discovered that the sewer system was not draining properly. The sewer line also needed to be replaced and required extensive rework in order to correct it. Another unique situation on this project is that the job was on property that the Coast Guard leases from the San Francisco International Airport (SFO) and apparently the authorities at the Coast Guard did not coordinate and obtain approval/concurrence on the project from the officials at SFO prior to beginning work. This dispute caused a long delay, but we finally completed the project. This project was located at San Francisco International Airport (SFO). Therefore, SMS had to perform work in strict accordance with SFO’s constructions requirements which required SMS to obtain proper insurances and all supervisors had to take the proper airport safety training course.
Upgrade Helicopter Wash Rack, US Coast Guard Sector
Project Details
Design & Build
San Diego
Client: United States Coast Guard
Project Size: $0M – $2M
Project Description
This design-build project involved designing and constructing a new Helicopter Wash Rack Drainage system. The existing drainage system was allowing too much storm water runoff to enter the City of San Diego’s wastewater system. To preserve the capacity of the wastewater treatment system, the City of San Diego requested that the USCG divert the storm water runoff away from the city sewage connection. In order to accomplish the project goals, Sergent Construction (SC) hired the Environmental Engineering firm ERRG. ERRG acted as Sergent Constructions design wing and was charged with evaluating the current helicopter wash water situation. From this evaluation, ERRF was contracted to provide a design with appropriate permits for upgrading the existing helicopter wash rack and pollution control device at Sector San Diego.
Construction involved the demolition of the existing drain clarifier. A new man vault was installed that joined the incoming drain line with the storm drain and sewer line. At the Y connection of these lines were two new electrically actuated 4-inch valves to divert the drainage either to the sewer or storm drain. The system was control by a DDC control system which used a roof mounted rain sensor to trigger the opening of the storm drain valve. This allowed storm water runoff to enter the storm drain instead of the sewer system. If the wash rack was on or under normal non-rainy operations, the valves would revert to their normal setting of allowing the drainage to enter the sewer.
In order to complete this project, Sergent Construction (SC) utilized the support of the following subcontractors. For the design phase, the environmental engineering firm ERRG was utilized. ERRG first performed an environmental study of the existing helicopter wash rack drainage. From this study, ERRG determined the flow rates and containments present in the existing run off system. Given this information, a design for the new system was developed. This design involved the installation of two electrically actuated 4-inch valves. These valves directed water flow either to the storm drain or wastewater treatment system based on rainfall. When rain fall is detected, drainage was then directed to the storm drain to minimize run off to the existing sewage system. ERRG also obtained all required city permits.
Roy’s plumbing installed the actuator valves located in the man vault along with the other miscellaneous plumbing activities. In addition, D&M concrete repaired the existing driveway concrete around the newly placed man vault.
On this design-build construction contract, Sergent Construction acted as the general contractor and self-performed the following trades: demolition of the existing drainage system, installation of temporary drainage tank, installation of man vault, wiring of the electrical and control system, and programming of the new control system. In total, SCS self-performed 82% of this project’s work.
Design and Install Mezzanine, Air Compressors, and Accessories
Project Details
Design & Build
Mobile, AL
Client: United States Coast Guard
Project Size: $0M – $2M
Project Description
This design-build project involved the installation of one new 12’x16’ elevated mezzanine with an air compressor and air compressor equipment inside the Coast Guard station’s existing warehouse/shop facility. The elevated steel mezzanine was constructed of structural steel with a metal deck and a reinforced lightweight concrete topping slab. OSHA approved railings and access ladders were provided to ensure that maintenance personal could safely access the equipment for maintenance and repairs.
Also included was the installation of an entirely new air compressor system to support both environmental and shop air. The new compressor system consisted of two new 30 Horsepower Direct Drive compressors, two vertical storage tanks with capacities of 120 gallon and 660 gallons. The air system also included an oil mist separator, oil water separator, two cycling refrigerated air dryers, a DDC control system, and all aluminum piping throughout to allow for the compressed air to be used for breathing. Additional work also included installing the necessary electrical systems to power the entire system as well as the installation of a touchscreen DDC Air Compressor control system.
On this design-bid-build construction contract, Sergent Construction (SC) acted as the general contractor and in addition self-performed all mechanical and electrical work. In total, SCS self-performed 55% of this task order’s work.