Past Projects
Miramar Water Treatment Plant Expansion
A major component of San Diego’s capital improvements program to meet the water needs of its fast-growing population, this project increases WTP capacity from 140 to 215 MGD and provides a state-of-the-art facility with a 75-year design lifespan.
Built in 1962, much of the original facility and equipment were approaching the end of their useful life-spans. Coupled with changes in drinking water regulations, an expansion and upgrade were essential to the city's continued ability to supply treated water.
Contract A
New construction entailed overflow / rapid mix / splitter box facilities, pre-ozonation / deaeration facilities, ozone facilities, twelve high-rate filters, bulk chemical storage area, chemical feed building, chlorine building, administration building, main switchgear building, and clearwell inlet structure, in addition to modifications to the existing flocculation / sedimentation facilities.
WSCI self-performed all excavation, backfill, structural concrete, process equipment, piping, and plumbing.
Contract B
Completed in 530 days for just under $51M, this second phase included new flocculation and sedimentation basins, demolition of additional portions of the original plant, and tie-ins to the work completed in Contract A.
Modesto Regional Water Treatment Plant Expansion
This expansion increased the capacity of Modesto Irrigation District's WTP from 36 MGD to 50 MGD. Originally completed in 1994, the plant treats and delivers water that supplements the City’s groundwater supply. Sourced high in the Sierra Nevada Mountains, the water then undergoes a state-of-the-art treatment process that ensures that it meets or exceeds all state and federal drinking water standards.
Using a design provided by Black & Veatch, WSCI constructed a new membrane facility and chemical feed systems with a reservoir pumping station. Improvements to the existing facility (completed in 1994) were also included in the contract.
Mountain House Water Treatment Plant
To meet the needs of a rapidly growing population, Western Summit, in conjunction with Carollo Engineers, designed and built a $43-million, 15 MGD expansion to an existing WTP serving the City of Mountain House, California, including a vast new subdivision. The entire project was completed in less than two years.
Since the residential development was built and sold quickly, WSCI also completed an interim project that met the immediate needs of the community during construction. Finished in less than four months, the $1.1M project increased capacity of the plant from 2.5 MGD to 5 MGD.
Gross Reservoir Hydroelectric Project
This $10.6 M project enables Denver Water to generate hydroelectric power as an ancillary benefit at its Gross Reservoir site. The contract included construction of a new powerhouse facility and installation of two hydroelectric turbines at the existing facility, as well as installation of 4-inch service water line inside the existing dam and large-diameter buried penstock piping tied into the new powerhouse.
The project site -- a box canyon at an elevation of 7,000 feet – presented difficult access, with its 40-foot-wide working space defined by raging water and extreme mountain terrain. Additionally, since the project was completed during winter months, WSCI established special safety programs and worked diligently with subcontractors and suppliers to ensure proper cold-weather scheduling, placement, and methodologies.
Clark County Central Plant Grit Basins 7 & 8
Focused on a new Grit Basins structure located in a congested area of the central plant, this project required a 35-foot-deep, shored excavation. The new structure comprises a Pump Room, Blower Room, and two Grit Basins. The overall project entails a new Tool Room Building, odor control fan and ductwork, large-bore grit basin influent / effluent lines, and miscellaneous site work and yardpipe.
Mauldin Road Wastewater Treatment Plant
Completed for the Western Carolina Regional Sewer Authority, this $59.8 M contract includes increasing the capacity of the existing Mauldin Road Wastewater Treatment Plant from 29 MGD to 70 MGD.
The project entailed installing new process equipment and converting a daily equalization basin into a bioreactor with additional cast-in-place walls, mixers, and pumps. New facilities were constructed to contain effluent filters, UV disinfection and chemical feed pumping systems, lime silo, bulk storage tank, and sidestream treatment unit. A new station in the existing headworks building handles septage and grease, and a scum-receiving station and new pumps and piping were added to the anaerobic digester facilities. Associated sitework, miscellaneous structures, and mechanical, electrical, and instrumentation were also upgraded.
East Cherry Creek Valley Projects
Western Pump Station and Water System
East Cherry Creek Valley Water & Sanitation District (ECCV) received a third of the water for its 50,000 customers through a water trade agreement. Once that agreement expired, ECCV would need its own 14.5-mile pipeline and pump station – and quickly. The District chose to contract with WSCI – though we weren’t the low bidder in a traditional design-bid-build procurement - based upon our aggressive schedule, our project approach, and our value engineering ideas.
The $8.4 M, fast-tracked project included a new pumping station that tied into an existing 30-inch supply line, with the new discharge tying into a new pipeline. To house three 4160V, 1250-hp turbine pumps and one jockey pump, we built a concrete structure that sits on grade beams and 50 caissons that are drilled 60 feet deep and enclosed by walls more than 30 feet high and 12 inches thick. Other construction included interior masonry walls, partial brick and aluminum fascia, garage and office space, extensive electrical and HVAC, as well as a bridge crane.
WSCI Piping Area acted as General Contractor for 70,000 feet of 48-inch and 54-inch welded steel pipe, along with all associated appurtenances. Challenges included installing pipe in the middle of existing parking lots, only 50 feet from existing businesses.
Northern Water System
Under a separate contract for the Northern Water System, WSCI Piping Area acted as General contractor for 164,092 feet of 48-inch steel pipe and 1,935 feet of 72-inch tunneling. We self-performed all tunnels, including those under major roadways including the Interstate.
San Juan Chama Water Project
For this project, WSCI’s Piping Area installed 15,000 feet of 42-inch diameter water transmission pipeline and appurtenances, replaced 9,900 feet of 6-inch waterline and water services, and bored and jacked 663 feet of 54-inch, steel-cased tunnels. WSCI also constructed two insulation valve vaults with connections to existing reservoir sites.
Under four separate contracts, the crew also auger bored 250 feet of 30-inch casing, 230 feet of 36-inch casing, 210 feet of 48-inch casing, and 390 feet of 60-inch casing; and tunneled 2,550 feet of 54-inch casing, 250 feet of 58-inch casing, and 295 feet of 72-inch casing. This required multiple 30- to 40-foot-deep shafts in very confined areas. A GME slide rail system was utilized for all deep excavations.
Northern Area Water System, Minot Segment
This $3 M project for the North Dakota State Water Commission entailed installation of 865 feet of 36-inch bored steel casing, 370 feet of 42-inch bored steel casing, and 1,250 feet of 48-inch bored steel casing. Ground conditions for the entire project were very wet and sandy, which necessitated use of a slide rail shoring system and a pilot tube system.
Nancy Creek Pump Station
The EPA and Georgia EPD required the City of Atlanta to have a 100 MGD, 160-foot- deep tunnel pump station online and fully operational within 28 months. The Nancy Creek Pump Station was built to remove wastewater from the tunnel as quickly as possible and thereby maximize the available capacity of the plant. Working proactively allowed Western Summit to beat the scheduled milestones, meet the $32-million budget, and provide a quality product while maintaining a safe work environment in hazardous conditions.
In 2006, the project earned a 2006 Design-Build Excellence Award from DBIA.
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