Wilder Projects

Abe's Main Street Cleaners
Groundwater Treatment And Soil Vapor Extraction Systems
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Project Location:
Milwaukee, Oregon

Client: Ecology & Environment, Inc. (for the Oregon Department of Environmental Quality)

Construction Cost: $200,000

Wilder’s Role: Prime

Construction Period: 6/98 – 6/98

Project Highlights
Funded by ODEQ Airstripping Installation of well vaults and Soil Vapor Extraction piping Installation of groundwater well vaults and double-containment piping Prefabrication and placement of groundwater treatment system System upgrades improved efficiency and reduced costs Restoration of work areas in active retail area Preparation of work and H&S plans

Wilder was contracted by Ecology & Environment, Inc., to provide remediation construction services for a project funded by the Oregon Department of Environmental Quality (ODEQ) to address tetrachloroethylene contamination in the soil and groundwater.

Wilder performed the installation of independent soil vapor extraction (SVE) and groundwater treatment systems (GTS) to address tetrachloroetheylene contamination. The treatment systems were prefabricated in secure steel container boxes and placed on a treatment pad by crane.

The SVE system, which involved a four-well network, included a blower, moisture separator, air filter, and associated valves and appurtenances. The SVE unit was installed on steel framework to allow access to monitoring wells. Wilder installed steel vaults at each SVE well location.

The GTS included two dual-bag filter units, equalization tank, air stripper, and two granular-activated carbon units. The GTS container box was installed on a 2,500-gallon steel tank fabricated for secondary containment. Wilder constructed two large well vaults and installed double-containment piping from the extraction wells to the GTS unit.

Wilder conducted a test run and 5-day equipment shakedown for both the SVE and GTS systems. Shakedown requirements included programming of the automatic call-out and dialer units (ACADUs) for both systems. Wilder developed the operations and maintenance manual for long-term system operation. Wilder assisted Ecology & Environment during system operation and installed a pretreatment system to prevent fouling caused by high dissolved-iron content.

Wilder performed mobilization, trenching and pipe installation, well vault construction and restoration within a rigid 6-day schedule without interrupting business operations at the existing dry cleaner facility.