Northeast Tank Altitude Valve Vault

Key Accomplishments

Johnston Construction Company

• The company furnished and installed a new precast-concrete utility vault complete with access hatch, ladder, manhole components, pipe penetrations, seals, and supporting appurtenances.
• JCC completed excavation, test pits, shoring, dewatering, bedding, aggregate placement, structural backfill, compaction, grading, and restoration required for the underground vault.
• The company installed ductile-iron piping, fittings, flanged and mechanical joints, restraints, supports, anchors, couplings, and isolation valves.
• JCC installed a hydraulically operated altitude valve with an adjustable altitude-control pilot and valve-position limit switch.
• The company connected the completed valve-vault piping to the existing Northeast Tank water system.
• JCC furnished and installed the electrical and electronic components required to power, monitor, and control the new valve-vault equipment.
• The work included connections to the City’s existing telemetry system for remote monitoring of valve position and tank-system operation.
• JCC installed electrical conduit, conductors, controls, instrumentation interfaces, grounding, and associated equipment within and around the vault.
• The company installed heating, air-distribution, ventilation, insulation, and dehumidification equipment required to protect the vault and its mechanical and electrical systems.
• JCC coordinated temporary system shutdowns and final piping connections with City personnel to minimize disruption to the active water-distribution system.
• The company performed flushing, pressure testing, disinfection, electrical testing, control verification, telemetry testing, valve adjustment, manufacturer startup, and operator training.
• JCC restored pavement, seeded areas, fencing, grades, and other surfaces disturbed by construction.

Electrical Services Division

• Electrical Services Division performed the electrical construction supporting the City of Aberdeen’s new Northeast Tank Altitude Valve Vault.
• ESD demolished the existing lighting panel and removed electrical components that conflicted with the new installation.
• The company furnished and installed conduit, conductors, boxes, devices, electrical connections, supports, and associated materials throughout the valve-vault facility.
• ESD furnished and installed the new lighting fixtures, switches, and receptacles required for safe operation and maintenance of the underground vault.
• The company furnished and installed the fan disconnect, electrical panelboard, and surge-protection device.
• ESD installed underground electrical raceways and completed excavation, backfill, and concrete encasement where required for its duct-bank work.
• The company coordinated electrical connections for equipment and materials furnished by Johnston Construction Company, the Owner, and other project participants.
• ESD provided electrical interfaces and wiring associated with the altitude valve, ventilation equipment, telemetry, instrumentation, and supporting vault systems within its contractual scope.
• The company coordinated installation around the precast-concrete vault, mechanical piping, access ladder, handrails, valve equipment, and limited interior working space.
• ESD prepared and submitted required product data, shop drawings, operations and maintenance information, and technical documentation.
• The company coordinated electrical inspections, testing, startup services, and correction of identified deficiencies.
• ESD maintained as-built information and prepared final record drawings showing the completed electrical installation.
• The work was completed using an open-shop workforce and included applicable travel, per diem, and sales tax.
• Electrical Services Division, LLC performed the electrical portion of the Northeast Tank Altitude Valve Vault project in Aberdeen, Maryland.