Collection System Operations Facility|
Calpo Hom & Dong Architects
2120 20th Street, #1, Sacramento, CA 95818
Location: Walnut Creek, California
LEED® Gold Pending
Date Bid: Oct 2009 Construction Period: Feb 2010 to Feb
Total Square Feet: 30,108* Site: 4.74 acres. Number of
Building Size: First floor, 11,441; mezzanines, 1,430; second
floor, 11,378; covered loading/unloading area, 4,410; covered material
bins/storage, 1,449; total, 30,108*.
Building Height: First floor, 20’; mezzanines, 10’; second floor,
14’6"; covered loading/unloading, 32’; covered material bins/storage,
24’; floor to floor, 20’; penthouse/mechanical screen, 8’6”; total, 43’.
Basic Construction Type: New/Structural Steel/Concrete/Tie.
Foundation: Cast-in-place, pier & grade beam, reinforced,
slab-on-grade. Exterior Walls: Cast-in-place, precast,
curtainwall, metal siding. Roof: SBS membrane, SBS garden
membrane, tapered insulation, metal. Floors: Concrete, structural
steel, metal deck. Interior Walls: Concrete, metal stud drywall.
Structural Engineer: Buehler & Buehler Structural Engineers - 600
Q Street, #200, Sacramento, CA 95811
General Contractor: Bobo Construction, Inc. - 9728 Kent Street,
Elk Grove, CA 95624
Mechanical Engineer: Sigma Engineering - 3517 Marconi Avenue
#204, Sacramento, CA 95821
Electrical Engineer: Capitol City Design - 1751 Cebrian Street,
West Sacramento, CA 95691
Cost Estimator: Bleckmann Construction Estimating - 2421 Rio
Bravo Circle, Sacramento, CA 95826
Civil Engineer & Landscape Architect: RBF Consulting - 500
Ygnacio Valley Road, Walnut Creek, CA 94596
The Central Contra Costa Sanitary District (CCCSD) was formed in 1946,
and currently serves a 146 mile area of Contra Costa County, in Northern
California. Centrally located within the District, is the Collection
System Operations (CSO) Department, responsible for the cleaning,
maintenance, and repair of the District's 1,500 miles of underground
The original CSO Facility was constructed in 1956. The 5.15 acre site,
with a 70-foot elevation change, is bounded by the I-680/24 Highway
Interchange, the Bay Area Rapid Transit (BART) District, and by
Springbrook Road, a public street leading to a residential area.
Overhead High Voltage transmission lines bisect the site east-to-west.
The facility includes Crew Operations, Warehousing, Administration,
Training, and Lockers and Showers. The Secure Site includes Vehicle
Storage, Covered Material Bins and Loading Area, Yard Storage, Fueling
Stations, and Training areas. A separate, existing Vehicle Maintenance
Facility shares the site. The original facilities no longer met the
operational, spatial, and technological needs of the District and the
CSO Department. A new CSO Facility was designed to accommodate present
and future operations and technology needs, improved site circulation,
training facilities, site storage, and a Secondary Emergency Operations
Center (EOC) for the District.
The new CSO Facility consolidates the Crews, Administration, and
Warehousing in a single, two-story building. Due to the topography of
the site, the yard is divided into Lower, Middle, and Upper Yards; the
new CSO Facility is nestled into the hillside separating the Lower and
Middle Yards. A central Second Floor Crew Room, which also serves as
Training Rooms and EOC, with adjoining Kitchen, provides a gathering
place for the Crews to plan and collaborate on their daily work
schedules, and opens onto the Middle Yard. Adjacent to the Crew Room are
separate Workrooms for the Construction and Cleaning Crews, and the
Technical Services support areas. Mud Rooms, Locker Rooms, and Showers
are provided for the Crews returning at the end of the day.
Administration Offices and the Warehouse are located on the First Floor,
and opens onto the Lower Yard. Public Entry is situated mid-level
between the two floors, due to the topography.
The CSO Facility utilizes a concrete slab with drilled pier and pad
foundations, a 20-foot high Tie-Back Retaining Wall to retain the
hillside, and structural steel framing with concrete and metal decks.
Concrete Wall Panels envelope the Warehouse area. Roofing is a
reflective SBS Membrane Roofing, with Metal Sunshades. The metal
exterior cladding with the curtain wall and concrete invoke the clean
lines of the building.
The CSO Facility is LEED-registered, and is pursuing LEED-Gold.
Environment and Energy Planning includes High-Efficient HVAC Equipment,
Hydronic Floor Heating and Low-Velocity Fan, Low-Flow Plumbing Fixtures,
Site Stormwater Filtration through Pervious Pavement, Bio-Swales, and a
Roof Garden. Windows are abundant throughout, with exterior Sunshades,
and an automated interior Shading System, to provide views and
daylighting, and are complimented by Energy-Efficient Light Fixtures,
with motion sensors. Polished Concrete Floors and Recycled Countertops
are used throughout the facility, and Low-emitting Materials on all
LEED® Points Achieved
Energy & Atmosphere
Materials & Resources
Indoor Environmental Quality 14
Innovation & Design Process 2
Metal Siding: Metal Sales Roof: Soprema, Metal Sales
Curatin wall, Entrances & Storefronts: US Aluminum
Daylighting/Skylights: Solatube Flooring: Bentley Carpet
Tile, Retroplate Polished Concrete
Gypsum: National Paint: Dunn-Edwards Lighting: Daybrite,
Williams Finelite, Emergilite Elevator: ThyssenKrupp