Gorman Avenue Water Treatment Plant Ferric Chloride System Addition

Key Accomplishments

Johnston Construction Company

• The work included a double-wall, high-density cross-linked polyethylene day tank with integral secondary containment.
• JCC installed three ferric chloride metering pumps, a geared chemical transfer pump, pressure sensors, pressure gauges, pulsation dampeners, calibration equipment, pressure-relief valves, and chemical-resistant flexible connections.
• The project included reinforced-concrete foundations, containment areas, tank pads, structural steel, FRP grating, FRP stairs, handrails, coatings, piping supports, and chemical-system access improvements.
• Electrical and control improvements included new panels, transformers, disconnects, starters, raceways, wiring, grounding, instrumentation, controls, alarms, and connections to the plant’s existing SCADA system.
• The work included mobilization, site preparation, excavation, underground utilities, concrete construction, chemical-storage tanks, process equipment, piping, electrical systems, instrumentation, controls, testing, startup, training, and site restoration.
• The principal improvement was construction of a new bulk ferric chloride storage and chemical-feed facility.
• The new system was designed to receive bulk deliveries of ferric chloride, store the chemical safely, transfer it to a smaller day tank, and accurately meter the chemical into the water-treatment process.
• The ferric chloride storage system included three bulk storage tanks.
• The bulk tanks were manufactured from fiberglass-reinforced plastic and designed for aboveground atmospheric storage of ferric chloride at approximately 40-percent concentration.
• Each tank was cylindrical with a flat bottom and flat top and included the nozzles, manways, fittings, external pipe clips, ladders, platforms, handrails, sight gauges, and accessories necessary for safe operation and maintenance.
• The tanks included 30-inch side and top manways, FRP access ladders, FRP platforms, handrails, and reverse-float-type level sight gauges.
• The reverse-float sight gauges provided a visible indication of chemical level using an internal float and external graduated clear tube.

Concrete Services Division

• CSD constructed the concrete foundations and containment structures required for the new ferric chloride bulk-storage and chemical-feed facility.
• The work included the ferric chloride bulk-storage tank pad, day-tank slab, facility foundation with trench, chemical-containment walls, equipment pedestal, sump pit, and concrete steps.
• The forming work included approximately 28 square feet of footing forms, 567 square feet of slab-on-grade forms, 973 square feet of straight-wall forms, 103 square feet of column forms, and 35 square feet of special formwork.
• CSD placed approximately 79 cubic yards of slab-on-grade concrete, 9 cubic yards of wall concrete, 2 cubic yards of column concrete, and the additional footing and fill concrete required by the project.
• The finishing work included approximately 1,331 square feet of floating and screeding and more than 1,100 square feet of pointing and patching.
• The work was coordinated with Johnston Construction Company’s excavation, reinforcing steel, concrete deliveries, pumping, testing, tank installation, chemical piping, electrical systems, and site-restoration activities.
• The overall project included construction of a new ferric chloride storage and feed system at the Gorman Avenue Water Treatment Plant.
• The new chemical facility included three bulk ferric chloride storage tanks, a double-wall day tank, chemical-transfer and metering pumps, process piping, secondary containment, electrical systems, instrumentation, controls, access systems, and associated site improvements.
• CSD’s work created the reinforced-concrete foundations, slabs, walls, trenches, sump, pedestal, and access features required to support and contain the new chemical-storage and feed equipment.
• The concrete subcontract specifically included work associated with:
• Ferric chloride bulk-storage tank pad Day-tank slab Facility foundation Chemical-piping trench Secondary-containment walls Equipment pedestal Sump pit Concrete steps
• CSD coordinated its work with Civil Drawing C-2, Structural Drawings S-1 through S-5, the concrete-forming requirements, concrete-reinforcement requirements, cast-in-place concrete specifications, and the approved project schedule.
• The principal concrete feature was the foundation and tank pad serving the ferric chloride bulk-storage facility.
• The new storage tanks required a level, durable, chemically resistant concrete support system capable of carrying the tank loads and maintaining the required equipment elevations.

B & R Electrical Contractors

• BRE’s work included electrical demolition, conduit, conductors, boxes, devices, panelboards, transformer installation, equipment connections, grounding, underground electrical ductbank, inspection, testing, startup, and project closeout.
• BRE installed the power and control infrastructure required for the new bulk ferric chloride storage and chemical-feed facility.
• The work included electrical connections serving three bulk ferric chloride storage tanks, a double-wall day tank, three chemical metering pumps, a ferric chloride transfer pump, control panels, tank-level instruments, alarms, and associated process equipment.
• BRE furnished and installed electrical Panelboards PBH and PBR and a new 15 kVA transformer.
• The underground electrical work included excavation, reinforced-concrete ductbank construction, conduit installation, and coordination with the chemical-containment structure, foundations, process piping, and existing plant utilities.
• BRE furnished stainless-steel mounting hardware and strut systems for miscellaneous panels, allowing equipment to be supported from the permanent structures without separate freestanding racks.
• The electrical work was coordinated with Johnston Construction Company’s excavation, concrete construction, tank installation, chemical piping, instrumentation, control-system integration, testing, and site-restoration activities.
• The overall project included construction of a new ferric chloride bulk-storage and chemical-feed facility at the Gorman Avenue Water Treatment Plant.
• The new chemical system included three fiberglass-reinforced-plastic bulk storage tanks, a double-wall day tank, ferric chloride transfer and metering pumps, chemical-resistant piping, secondary containment, reinforced-concrete foundations, access systems, instrumentation, controls, and SCADA integration.
• BRE provided the electrical infrastructure required to power, control, monitor, and operate the new chemical-storage and feed systems.
• The electrical scope began with demolition and make-safe work associated with existing electrical systems affected by the new construction.
• BRE identified, isolated, disconnected, and removed designated conduit, conductors, boxes, devices, and related electrical components shown for demolition.
• The subcontract excluded complete removal of the existing ductbank shown on Drawing E-2, but BRE included two days of labor to assist Johnston Construction Company with the ductbank-removal activities.
• Existing electrical equipment and circuits designated to remain were protected throughout construction.