LocationLexington Park, St. Mary's County, Maryland
MarketWastewater Treatment Plants
CLARIFIER TANK DEMOLITION AND RECONSTRUCTION, AUGER CAST-IN-PLACE PILE FOUNDATION, RAS PUMP WELL, SCUM WELL, CLARIFIER MECHANISM REHABILITATION, PROCESS PIPING, STRUCTURAL METALS, COATINGS, ELECTRICAL SYSTEMS, CONTROLS, TESTING, STARTUP.
Johnston Construction Company
- Johnston Construction Company completed the Marlay Taylor Water Reclamation Facility Secondary Clarifier No. 1 Replacement project for the St. Mary’s County Metropolitan Commission.
- The project included complete demolition of the existing Secondary Clarifier No. 1 tankage, return activated sludge pump well, and associated scum well.
- JCC constructed a new deeper reinforced-concrete clarifier tank supported by an auger cast-in-place pile foundation designed to resist settlement and hydrostatic uplift caused by the site’s high-groundwater conditions.
- The new clarifier included an integral return activated sludge pumping station, integral scum well, new piping, valves, access structures, stairways, grating, railings, electrical systems, lighting, instrumentation, and process controls.
- JCC removed, stored, rehabilitated, modified, and reinstalled the existing clarifier mechanism, including the rake assembly, influent center column, bridge, drive unit, center cage, scum equipment, effluent weirs, density-current baffle, algae-cleaning system, and associated components.
Concrete Services Division
- Concrete Services Division, LLC completed the concrete work associated with the Marlay Taylor Water Reclamation Facility Secondary Clarifier No. 1 Replacement.
- CSD furnished the labor, form materials, tools, equipment, finishing supplies, curing materials, and concrete accessories required for the project.
- The work included forming and concrete placement for the new clarifier foundation, base slab, circular walls, effluent trough, return activated sludge pump well, sludge well, grade beams, equipment-support features, stairs, and related structural components.
- CSD completed footing, slab-on-grade, curved-wall, straight-wall, column, special, bulkhead, and box-out formwork.
- The project included concrete encasement around the influent and return activated sludge piping and construction of associated pipe-support and grade-beam systems.
B & R Electrical Contractors
- B & R Electrical Contractors, Inc. completed the electrical work associated with the Marlay Taylor Water Reclamation Facility Secondary Clarifier No. 1 Replacement.
- BRE furnished the labor, materials, tools, equipment, and supervision required for the electrical work.
- The project included demolition of the existing wiring serving Secondary Clarifier No. 1 and the return activated sludge pumps.
- BRE removed and reinstalled existing electrical disconnects, the seal-leak relay panel, and the clarifier control panel for reuse with the replacement clarifier system.
- BRE installed conduit, power and control wiring, boxes, devices, supports, grounding components, and final equipment connections.