Commercial Oil Services Superfund Site

Oregon, Ohio

Date of Execution: Phase 1 - September 1994 / Phase 2 - October 1998

Significant Project Features:

• Waste characterization, decommissioning and demolition of 40 above ground tanks, 3 underground tanks, a septic tank, associated piping and appurtances and associated contaminated soils.

• Construct drum staging facility. Remove, stage, characterize and dispose of buried drums.

• Construct, operate and maintain a temporary on-site wastewater treatment plant. Pump, treat and discharge 4,025,000 gallons of leachate from lagoons.

• Decommission and demolition of all site structures.

• Solidification/Stabilization of 144,000 cubic yards of oil contaminated lagoon sludges.

• Construct 5 acre on-site containment cell with a TSCA clay liner and leachate collection system.
• Construction of a multi-layer RCRA cap.

• Installation and development of post construction perimeter monitoring well system.

History and Location of Project

The Commercial Oil Services Site is an abandoned waste oil recycling facility which operated from 1969 to 1985. Hazardous materials, including waste oils, sludges and solvents were stored in tanks, vessels and lagoons at the site.

Description of Work

In 1994, Sevenson was awarded the Phase I remedial action contract. This contract required Sevenson to sample, characterize and remove all plant above ground and underground tank contents (65,000 gallons); excavate and stockpile contaminated soils (2,000 cubic yards); collect and treat off site contaminated water (200,000 gallons); and decommission and demolish all plant structures. One key to successfully implementing this remedial action was the development of compatibility Analytical Testing/Waste Acceptance Criteria Plan. The elements of this plan included establishment of sample locations and frequencies; sample recovery; screening; compatibility testing and final disposition of the waste. Sevenson's analytical laboratory subsidiary, Waste Stream Technology, Inc., worked with project personnel to develop this plan and facilitate turnaround times required to meet the project schedule.

In October, 1998 Sevenson was awarded Phase II site remediation. Phase II activities addressed the closure of the seven onsite lagoons. The lagoons contained 144,000 CY of oil sludge contaminated with PCB's, VOC's and heavy metals. The scope of work required under the contract included the construction of a clay lined 5 acre TSCA landfill with leachate collection system; construction of a groundwater recovery/wastewater collection and treatment system capable of treating up to 200 gpm; excavation and stabilization of 69,000 CY of PCB contaminated soils; stabilization of 75,000 CY of partially stabilized soils; and excavation of contaminated soil. All stabilized and contaminated soils were transferred, placed and compacted in the landfill. Upon completion of waste consolidation activities a RCRA cap was constructed over the landfill. Site restoration activities completed remedial action requirements.

The key scopes of work associated with Phase II remedial action included:

• Wastewater Treatment: Sevenson designed, operated and maintained the temporary wastewater treatment plant. The system was designed to include oil/water separation, sand filtration, metals removal, Ph adjustment, carbon adsorption, and ammonia removal capable of treating up to 200 gpm. Sevenson treated approximately 4,100,000 gallons of wastewater meeting discharge requirements.

• Stabilization Operations: This phase of the project included blending existing partially stabilized sludge and raw lagoon sludge. Blended material was excavated and transported to a staging area for treatment through a pugmill system. The pugmill system was housed in a temporary structure which mixed the stabilization reagent with the lagoon sludge and partially stabilized sludge. Particulates and VOCs generated during pugmilling were treated through an air pollution control system that consisted of a prequench separation system followed by a catalatic oxidizer with a packed tower scrubber. Treated sludge was transferred to the landfill via conveyor for placement and compaction. The stabilized sludge met daily compressive strengths of 20.8 psi, compacted to 90% of Standard Proctor Density and TCLP volatiles testing. Sevenson processed 1,000 - 1,400 tons per day.

• Landfill Development: The existing lagoons were converted into an onsite landfill. Landfill construction included installation of a TSCA liner, the installation of a drainage layer/leachate collection system, and construction of a RCRA cap that required the placement of a 24 inch clay layer, a 40 mil textured HDPE liner system, an 18 inch granular drainage layer, geotextile fabric, an 18 inch common fill layer and 6 inches of topsoil and seed.

Phase II remediation was completed on time and to the owner's satisfaction.

Health and Safety Overview:

• Unique Characteristics: Various times throughout project upgrades to level B with in-line air was required to protect the work force.

• Health and Safety Measures: Levels of Protection B, C and D.

• Health and Safety Staff: Ken Walters, Health and Safety Officer and Paul J. Hitcho, PhD, CIH.

• How 40-Hour Training Was Implemented: All employees undergo training under 29CFR 1910.120 in-house.

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