Dover Long Point Water Treatment Plant Process Improvements

Key Accomplishments

Johnston Construction Company

• Renovated the existing water-treatment facility while integrating new treatment processes and infrastructure.
• Expanded and improved the plant to increase treated-water capacity and enhance the existing treatment process.
• Constructed new treatment facilities supporting the plant's expanded process operations.
• Constructed new process tanks associated with backwash and residuals handling.
• Constructed improvements associated with the new filter building and support tanks.
• Constructed new backwash processing and residuals facilities.
• Constructed new GCL-lined sand drying beds for treatment-process residuals handling.
• Performed subgrade preparation, liner installation and aggregate placement associated with the sand drying beds.
• Installed sand, rice gravel and pea-gravel media layers associated with the drying-bed system.
• Coordinated process piping through the sand drying beds and related facilities.
• Furnished and coordinated a complete automatic pressure-filtration system.
• Included treatment vessels, inlet distributors/waste collectors, underdrain distributors, support gravel and filtration media as components of the pressure-filtration system.

Concrete Services Division

• Performed specialized cast-in-place concrete construction supporting a major municipal water treatment plant improvement project.
• Furnished labor, supervision, formwork-related materials, tools and equipment necessary to execute CSD's concrete scope.
• Performed concrete work for the Filter Building.
• Performed concrete work for the Backwash/Residuals Building.
• Performed concrete work associated with the Sand Drying Beds.
• Performed concrete improvements associated with renovations to the existing Treatment Building.
• Mobilized and demobilized concrete equipment, tools and supplies required for the work.
• Furnished, installed and stripped concrete formwork.
• Formed footings, slabs-on-grade, straight walls, columns and special concrete elements.
• Placed concrete for footings, slabs-on-grade, walls, columns and miscellaneous fill applications.
• Performed concrete finishing, including floating, screeding and machine troweling.
• Performed point-and-patch finishing to completed concrete surfaces.
• Performed concrete curing and furnished associated curing supplies.
• Installed concrete accessories associated with premolded joint material and waterstops.

B & R Electrical Contractors

• Performed the major electrical construction package for the City of Dover's comprehensive Water Treatment Plant Process Improvements project.
• Furnished electrical labor, materials, tools, equipment and supervision required to complete BRE's subcontracted work.
• Installed power conduit, instrumentation conduit, wiring and electrical connections throughout the upgraded treatment facility.
• Installed electrical infrastructure serving new and renovated water-treatment process equipment.
• Furnished and installed conduit systems appropriate for interior, exterior, underground and process-area conditions.
• Installed underground electrical raceways and associated electrical infrastructure.
• Performed electrical duct-bank excavation associated with the project electrical drawings.
• Installed wiring and connections for new plant electrical-distribution systems.
• Performed modifications and demolition involving portions of the plant's existing motor-control-center infrastructure.
• Furnished and installed work associated with MCC-A, MCC-B and MCC-C.
• Coordinated startup and training associated with the three motor-control centers.
• Installed and coordinated electrical distribution equipment serving upgraded process loads.
• Installed electrical panelboard-related infrastructure serving new and renovated treatment areas.
• Coordinated new electrical equipment with existing plant distribution systems.