Portfolio Category: Water & Wastewater

24-inch Putah South Canal Emergency Raw Water Repair

24-inch Putah South Canal Emergency Raw Water Repair Benicia, CA DCCM provided construction management and full-time inspection services for the City of Benicia’s 24-inch Putah South Canal Emergency Raw Water Repair Project. The emergency repair addressed a critical raw water transmission line extending from private property near Watt Court, beneath Interstate 80, and into City of Fairfield property. Due to the pipeline’s importance and its location within a major transportation corridor, the project required accelerated construction, careful coordination, and strict traffic control and safety oversight. Construction activities included traffic control along the westbound shoulder of Interstate 80, excavation of entry and exit pits, slip lining of an 18-inch fusible PVC pipe, hydrostatic testing, and full site restoration. DCCM supported the City throughout all phases of construction, providing daily field inspection, documentation, safety compliance monitoring, and traffic control oversight to ensure work conformed to project plans, specifications, and regulatory requirements. Construction management services included coordination with City staff, the contractor, property owners, and the design team; administration of submittals, RFIs, and change orders; cost and schedule monitoring; and preparation of progress reports and pay estimate recommendations. DCCM also supported project closeout by verifying punch list completion, reviewing record drawings, and delivering complete construction documentation. The project was successfully completed under emergency conditions while maintaining safety, quality, and schedule objectives. At a Glance $97,000 Project Cost Markets Water Services Transportation Water & Wastewater

Butler Beach Drainage & Stormwater Master Plan

Butler Beach Drainage & Stormwater Master Plan St. Augustine, FL DCCM was tasked by St. Johns County to analyze the Butler Beach region’s drainage characteristics and study of how the region’s various sub-regions interact with each other. Our staff reviewed the existing drainage basin and identified areas of concern, which included the watersheds and stormwater infrastructure within the Butler Beach drainage area. Data was collected and analyzed from FEMA historic claims, Florida Department of Transportation infrastructure, field observations, Natural Resources Conservation Service (NRCS) soils information, current St. Johns River Water Management District permits, National Oceanic and Atmospheric Administration (NOAA) storm data, multiple field surveys and observations along with other data sources. In addition, a community forum/public meeting was held to identify other potential deficient areas. Each sub-region was evaluated, and recommendations were made for improvements. Maintenance considerations, capital costs and overall construction feasibility were considered. The proposed solutions were ranked based on the overall benefit cost analysis to assist the County in determining timing and funding of capital improvements to the drainage systems, overall effectiveness, ease of maintenance, feasibility of construction, and overall benefit to the sub-region. Finally, a detailed with report with full details for each potential solution was created and presented to St. Johns County. At a Glance 2.7 Sq Miles Project Size $118,000 Project Cost Markets Land & site development Services Land & Site Development Water & Wastewater

Burkart Boulevard Bypass

Burkart Boulevard Bypass Seymour, IN This project involved constructing a 4.7-mile-long bypass around Seymour. The bypass extends from the US 50/Burkart Boulevard Intersection southwest and connects to the O’Brien Street intersection. The first phase of the project features a 99-ft. long bridge over the Conrail railroad, an MSE wall design that minimized the right-of-way footprint, a single-lane roundabout that can accommodate semi-truck and farm equipment traffic, and a new multi-use pathway along the project limits. The bypass also resulted in entirely new alignment and permanent traffic pattern changes. DCCM participated in extensive public involvement, continually coordinated with INDOT, the City of Seymour, and Conrail Railroad, and provided on-site and off-site mitigation efforts to accommodate all project features. At a Glance 4.7 Miles Project Size $17.2M Project Cost ACEC State Finalist Project Award Markets Transportation Environmental Services Transportation Environmental Roadway Design Roundabout Structural Engineering Water Resources

Northeast Water Purification Plant Expansion

Northeast Water Purification Plant Expansion Houston, Texas DCCM partnered with the Houston Waterworks Team to perform a progressive design-build project to expand the existing City of Houston Northeast Water Purification Plant from 80 million gallons per day to 400 million gallons per day treatment capacity. DCCM was responsible for the structural and mechanical design of the new raw water intake pump station, located 1,000 feet offshore in the middle of Lake Houston. It has an access bridge and pump station platform with ten 1,000-horsepower vertical turbine pumps capable of delivering up to 560 million gallons per day (ultimate capacity) of raw water from Lake Houston to the Northeast Water Purification Plant. DCCM performed structural design modeling and simulation of a 30,000-square-foot pump station platform that supported the pump facility building, pump equipment, piping and electrical switchgears, and process mechanical design to install ten 1,000-horsepower vertical turbine pumps with two 96-inch header pipes, control valves, and a 25-ton bridge crane. The intake pump station platform is 13 feet above normal water level and 250 feet long by 120 feet wide, supported on a cast-in-place 1-foot-thick concrete deck with 3.5-foot-deep grade beams. DCCM designed and analyzed the intake pump station using the finite element program Structural Analysis and Designing Program. Dynamic analyses were also performed to verify the platform’s dynamic behavior under pump dynamic loads during operation. Bentley 3D models were used in the final design by structural, architectural, process mechanical, piping, plumbing, instrumentation, and electrical design disciplines. All design models were integrated to detect conflicts and complete the final product. At a Glance 400 million Gallons per Day $165 million Construction Cost Markets Municipal Services Water & Wastewater Utilities

IH 45 and SH 6 Water Distribution System Improvements

IH 45 and SH 6 Water Distribution System Improvements Galveston County, Texas DCCM provided preliminary and final design and construction-phase services for 8,100 linear feet of 24-inch water line as part of a collaboration between the Galveston County Water Authority and Galveston County to provide potable water to a future residential area in Texas City. To accommodate this needed water line, an alignment was established at the intersection of Avenue L and a Galveston County Water Authority canal in Santa Fe, where the line connected to an existing water line and then extended along the north high bank of the canal to a metering station site west of IH 45. This project was funded by the State of Texas through a Community Development Block Grant and administered by the Texas General Land Office due to damage from Hurricane Ike. The funding was allocated to Galveston County, thereby funding the construction and managing the design and construction phases. At a Glance 8,100 Linear Feet 24-inch Water Line $1.8 million Csontruction Cost Markets Municipal Services Utilities Water & Wastewater

Countryside Wastewater Treatment Plant Decommission, Lift Station and Force Main Upgrade

Countryside Wastewater Treatment Plant Decommission, Lift Station and Force Main Upgrade League City, Texas DCCM was selected to provide preliminary engineering, final design, and construction services to decommission the existing Countryside Wastewater Treatment Plant (WWTP) and install a new lift station and new force main to divert wastewater to the existing Southwest Water Reclamation Facility. The existing lift station was decommissioned and replaced with a new 10-foot lift station featuring three 20-horsepower submersible pumps, providing a firm capacity of 850 gallons per minute for diversion service. The design included modifications to the existing sewer collection system, including the addition of new manholes and gravity lines to intercept and divert sewer flow to the new lift station. Construction sequencing, bypass pumping, and coordination were carefully planned to allow the construction of the new lift station, sewer diversion, and demolition of the existing lift station and wastewater treatment facilities. The new lift station featured a programmable logic controller (PLC)-based pump control panel, supervisory control and data acquisition (SCADA) access via a wireless antenna for remote monitoring, and a manual transfer switch to facilitate emergency generator connection in accordance with TCEQ requirements. At a Glance 850 Gallons per Minute $1.6 million Construction Cost Markets Municipal Services Water & Wastewater

108-Inch Northeast Transmission Line, Contract 99D-2

108-Inch Northeast Transmission Line, Contract 99D-2 Houston, Texas DCCM provided final engineering design and construction-phase services for 1.4 miles of 108-inch water main from Aldine Westfield Road to Willis Street in north Houston. This project was extremely complex due to the size of the water main and the congested area where the alignment was located. DCCM worked with the City of Houston and its Program Manager to develop a 50-foot water line easement through an existing urban region. To develop the preferred alignment, DCCM considered construction issues, including laydown areas, environmental constraints, traffic impacts, and existing utilities. DCCM developed alignment alternatives, such as tunnels instead of open-cut construction, in multiple areas to minimize or eliminate significant impacts on existing businesses, as numerous commercial buildings are close to the route. Tunnels were designed to mitigate the impact on the buildings and their operations in these areas. Since the project was in an urban region, DCCM worked closely with the existing utilities to develop utility conflict documents and support their relocation. The design also included construction phasing and traffic control to maintain access to residences, facilities, and emergency services. The water line was a significant transmission main constructed via open-cut and tunneling methods. Each method was optimized for the project. At a Glance 108-inch Water Main 7,400 Linear Feet $31 million Construction Cost Markets Municipal Surveying Services Water & Wastewater Surveying Utilities

69th Street Wastewater Treatment Plant, Packages 5 and 6

69th Street Wastewater Treatment Plant, Packages 5 and 6 Houston, Texas Package 5: DCCM completed field investigation and final design services to replace the existing 69th Street wastewater treatment process instrumentation and controls for the entire wastewater facility. Work included the replacement of flow meters, analyzers, pressure and level instruments, pneumatic and electrical control valves, electrical conduits, and control panels for the lift station, headworks, flow distribution controls, oxygen reactors, clarifiers, return activated sludge and waste activated sludge pump stations, sludge thickeners, and an odor control system. Package 6: DCCM provided a preliminary engineering study, including filter pilot testing and evaluation of new tertiary filter technology to replace the existing sand filters at the 69th Street WWTP. DCCM worked with the City of Houston to procure a new filter system. The final design included modifying the existing treatment facility infrastructure and adjusting the hydraulic profile to fit the new filter system, a new electrical system with instrumentation, and control systems. The existing sand filter system was demolished and replaced with a Kruger disc filter system. The new disc filter system is rated for an average of 220 million gallons per day and a peak flow of 440 million gallons per day, making it Texas’s largest tertiary filter system installation. At a Glance 440 million Gallons Per Day $25.4 million Construction Cost Markets Municipal Services Water & Wastewater

42-inch Water Line Design, Segment 3 A1

42-inch Water Line Design, Segment 3 A1 Harris County, Texas DCCM provided final design and construction phase services for 14,000 linear feet of 42-inch water transmission line within a CenterPoint Energy electric transmission line corridor and easement. This water line is part of the West Harris County Regional Water Authority’s (WHCRWA) 2025 system, which will meet at least 60% of water demand with surface water. This is the latest project in a long history of working with WHCRWA to supply their surface water requirements. The project involved installing water lines in CenterPoint Energy’s electrical transmission line corridor for miles. Trenchless construction was required within 20 feet of truss towers and across busy roadways. Close coordination was maintained with the City of Houston and Harris County for permitting and the acquisition of record drawings. Collaboration with the design engineer ensured a proper connection to an 84-inch water line. Additionally, coordination with multiple petroleum pipelines and dry utilities in CenterPoint Energy’s corridor was necessary. At a Glance 42-inch Water Transmission Line $8.9 million Construction Cost Markets Municipal Surveying Services Water & Wastewater Program Management Surveying Utilities

Piper Road Drainage Improvements

Piper Road Drainage Improvements Brazoria County and Pearland, Texas DCCM provided design plans and specifications for a bid-ready submittal package that included comprehensive drainage and minor roadway improvements for Piper Road. The 2,900-foot project extended from FM 518 (Broadway Street) on the north to Fite Road on the south. The project included an asphalt overlay, along with subgrade repairs where necessary, based on visual cracking and pavement failure. The design reduced the watershed area for the portion of Piper Road draining to the north, which diminished a recurring ponding problem at FM 518. The majority of the roadway now drains to Fite Road on the south using storm sewers underneath the former ditches. Driveway culverts were eliminated for the storm sewers draining to the south and were replaced with area drains between the driveways for direct drainage into the new storm sewer system. Using storm sewers in this manner eliminated the need to do costly utility relocations or ROW acquisition. At about the same cost as acquiring ROW and moving utilities, this concept greatly reduced the time required for project completion and the need to disrupt the front yards of homes along Piper Road. Existing, significant trees also did not need to be removed. Existing water and sanitary sewer main lines and services were either protected or replaced to accommodate the new storm sewers. We leveraged our relationship with CenterPoint Energy to expedite relocations with the proposed storm sewer before construction began, keeping the project on schedule. The project significantly improved drainage compared to the existing roadway ditches. At a Glance 2,900 Feet $1.2 million Construction Cost Markets Municipal Services Water & wastewater

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