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2 IRM Description
This section presents a description of the IRM, monitoring, and the O&M activities for the IRM dual phase
extraction (DPE) system.
2.1 DUAL PHASE EXTRACTION SYSTEM
The IRM consists of a DPE system comprised of 10 extraction wells and upgraded equipment for treating
aqueous and vapor phase streams. The groundwater extraction system consists of 10 extraction wells,
including four new B-zone wells (EW-4-25B, EW-5-25B, EW-7-25B, and EW-10-25B), modifications of
three existing extraction wells (EW-2-62C, EW-3-60C, and EW-6-60C), and converting three existing
borings (EW-1-62C, EW-8-62C, EW-9-86C) to extraction wells. New treatment equipment was installed
for treating aqueous and vapor phase streams extracted from the wells. The equipment is housed in a
new treatment building.
This section describes the process and mechanical components of the DPE. The basis for the design,
calculations and assumptions are provided in the 80% Interim Remedial Measure Design Report. Further
description of the design and as-built configuration is provided in the Construction Complete Report. The
as-built drawings for the IRM system are provided in Appendix A.
The major components of the system are as follows:
• Ten extraction wells with bottom-inlet, controllerless, pneumatic pumps manufactured by QED
Environmental Systems (Short AP2B) were installed in each extraction well to recover groundwater,
with the exception of EW-9-86C. At EW-9-86C, which is an angled boring, an angle-independent
3-inch diameter electric submersible pump manufactured by Grundfos ® (10SQE05100) was installed
to pump groundwater from beneath the fire water reservoir.
• 1-inch inner-diameter Duratec TM aluminum composite piping to convey compressed air to the wells
and the treatment building
• 1-1/4-inch outer-diameter (OD) Nylon 12 tubing to convey extracted groundwater to the treatment
system
• 2-inch and 4-inch OD high density polyethylene (HDPE) vapor conveyance piping
• Pre-fabricated well vaults constructed of steel for each extraction well
• One 1,000-gallon equalization tank manufactured of aluminum with inlet/outlet ports, vent, drain with
ball valve, 4-position float switch assembly, and exterior Gould’s NPE 1 st 1ST1F5D4 1-1/2
horsepower (hp) effluent transfer pump and appurtenances
• Bag filtration unit consisting of six aluminum construction high-pressure bag filter vessels
• Four tray low-profile air stripper model QED 4.4 SS capable of up to 25 gallons per minute (gpm), air
flow of 210 standard cubic feet per minute (scfm) at 40.7 inches of water column, 4.24 hp blower fan,
and Gould’s NPE 1 st 1ST1F5D4 1-1/2 hp effluent transfer pump and appurtenances
• Two 250-pound liquid phase carbon vessels
• Two 1,000-pound vapor phase carbon vessels
• One 7.5 hp Ingersoll-Rand ® reciprocating air compressor with air dryer, particulate filter, 3-way
solenoid valve, and pressure and temperature indicators
• One 120-gallon air/water separator and Sutorbilt Legend ® blower (model 5LP-DSL) positive
displacement rotary lobe blower with 20 HP Emerson motor with associated appurtenances
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