LocationLeesburg, Loudoun County, Virginia
MarketWater Storage and Tanks
TANK FOUNDATION, SITE CIVIL, PIPING, ELECTRICAL, INSTRUMENTATION & SITE RESTORATION.
Johnston Construction Company
- Performed major civil construction supporting Loudoun Water's new 1,000,000-gallon steel spheroidal elevated water storage tank for the 600 Pressure Zone in Loudoun County, Virginia. The overall project included the tank, foundation, site improvements, access facilities, piping, electrical systems and SCADA infrastructure.
- Constructed the Caldwell-designed tank foundation and associated tank slab, providing the structural base required for erection of the one-million-gallon elevated tank.
- Installed and maintained required erosion and sediment controls, construction access measures and temporary site controls throughout Johnston's construction activities.
- Performed site preparation, grading, staking, excavation, backfill, dewatering and restoration associated with the tank foundation and surrounding site improvements.
- Constructed and maintained the construction access road required for delivery of materials, equipment and Caldwell's tank-erection operations. The subcontract required the access road to be installed within 60 days of Notice to Proceed.
Concrete Services Division
- Performed specialized concrete construction for the foundation of Loudoun Water's new 1,000,000-gallon elevated water storage tank in Loudoun County, Virginia.
- Completed concrete work in accordance with the project specifications, addenda, Caldwell tank-foundation sketches and applicable contract drawings.
- Performed footing formwork, slab-on-grade formwork, curved-wall formwork and straight-wall formwork for the tank foundation and associated concrete structures.
- Completed concrete placement for the foundation footing, slab-on-grade and concrete walls.
- Performed concrete-finishing operations including float/screed finishing, trowel finishing, point-and-patch work and curing.
Electrical Services Division
- Performed electrical work in accordance with the applicable Division 26 specifications, CH2M design documents, CTI foundation sketch, Electrical Drawings E-1 through E-4, Addenda 1 through 3 and the project control estimate.
- Furnished and installed extensive electrical conduit and raceway systems, representing a major portion of the electrical subcontract.
- Furnished and installed electrical wiring, boxes, devices, lighting fixtures and switchgear required for the new elevated water storage facility.
- Provided the specified transient-voltage surge suppressor for Panelboard LP-A, including the TVSS requirement identified in Division 26 even though it was not shown on the electrical drawings or one-line diagram.
- Installed security-system conduit with pull strings from the facility to the required locations, including conduit to the base of security poles, while security wiring, cameras, card readers, controllers and related security equipment were furnished by others.