Specialists in Environmental Remediation, Natural Resources and Information Management
During a comprehensive site characterization, PCBs were detected in soil, concrete and sediment at nine (9) different units at this large multi-acre facility. Based on PCB Mega-Rule requirements, three (3) areas were determined to be low occupancy and six (6) areas were determined to be high occupancy. Appropriate clean-up standards for each area were therefore applied.
A total of 600 cubic yards of PCB-affected soil (including 65 cubic yards of TSCA soil) were excavated with a rubber-tire backhoe from three (3) areas of the site. Laboratory samples were collected to confirm that applicable action levels had been achieved. During the soil excavation, AGES staff used EnSys® 12T test kits to screen samples in the field and successfully delineate the extent of PCBs in the soil and segregate waste (TSCA versus non-TSCA). This resulted in rapid completion of field work with no re-mobilizations. It also helped to reduce the volume of TSCA waste shipped off-site.
During the project, AGES staff also oversaw the clean-up of over 17,000 square feet of PCB-affected concrete flooring. Concrete was scarified to an average depth of ½ inch with a remote-controlled (“Moose”) and manual (“Squirrel”) dustless concrete scabbling system manufactured by Pentek, Inc. Portions of the flooring were also removed with a jackhammer when scabbling was ineffective. As with the soil excavation work, EnSys® 12T test kits were used in the field and laboratory samples were collected to confirm that action levels had been achieved. A total of twenty (20), 55-gallon drums of concrete dust and nine (9) supersacks of debris were generated during the field work.
All field work was completed on schedule and within the approved project budget.
• By using ENSYS kits to field screen soils, the volume of excavated soil was limited, which significantly reduced waste disposal costs.
• Use of the ENSYS kits also allowed for the soil excavation to be completed during one (1) mobilization, which fixed project mobilization costs and allowed for adherence to a tight project schedule.
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