Cut-Off Collar and Groundwater Recovery Sump (GRS) System Installation

Location: Salem, Oregon
Client: Confidential Major Insurance Provider
Contract Value: $101,495

AEC was  contracted by a large insurance company to perform the installation of a Cut-off Collar and Groundwater Recovery Sump (GRS) System at their campus in Salem, OR. The project was performed in an effort to control petroleum-contaminated soil and groundwater at the site. Our scope began with acquiring permits, performing utility locates and providing the fencing, signage, barricades and all pertinent safety equipment within the project area. After mobilizing, crews excavated and installed cut-off collars in both the north and south areas and oversaw all associated drilling activities. Once complete. the cut-off collar area was backfilled with a Controlled Density Fill (CDF) concrete material.

Crews trenched the GRS discharge line approximately 40 lineal feet to the sanitary sewer in the roadway. Following excavation of the GRS system trench, we installed all necessary pumps according to the plans and specification, and disposed of all petroleum contaminated soil (PCS) which was removed from the GRS trench at the Coffin Butte Subtitle D Landfill in Corvallis, OR.

AEC also dug a small electrical trench approximately 235 lineal feet and managed an electrical subcontractor during installation of the new conduits prior to backfilling the trench with imported crushed rock. We then excavated and prepared forms in order to place a new electrical pad. During the course of our work, we pumped and contained approximately 8,000 gallons of groundwater which was disposed of along with the 115 tons of contaminated material at the Coffin Butte Landfill. Finally, all asphalt and concrete which was originally saw cut and removed in order to excavate the trenches was restored to match existing conditions.

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