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Paul Lear
Paul Lear

Technical Director

Dr. Lear has over 20 years of experience in the environmental remediation industry which includes leading multi-disciplinary teams in the completion of over 300 projects in the arenas of bioremediation, chemical oxidation, dewatering, soil washing, stabilization/solidification, thermal desorption and water treatment for hazardous, toxic and radioactive wastes. Dr. Lear is an internationally recognized expert in the stabilization/solidification. He has been involved in the treatment of over 2.5 million cubic yards of sediments, soils, and sludges.


Background/Objectives - On January 3, 1974, there was a documented release of approximately 600,000 gallons of Number 2 Fuel Oil at the Site. Approximately 276,000 gallons of fuel oil were reportedly recovered and an unknown quantity of fuel oil was discharged into the Delaware River. Residual free product in the soil at the Site was addressed by ISS. ISS was performed in cell sizes of 525 square feet. The ISS treatment depth ranged from 10 to 14 feet. The mix design consisted of 6% blast furnace slag cement (slag) and 4% Portland cement (cement) by dry soil weight. An excavator homogenized the grout and soil over the entire depth of the treatment cell.until the material appeared visually homogenized. ISS field samples were collected from the treated soil within 1-hour of mixing completion. All samples met the performance criteria of greater than 50 psi UCS and less than 1x10-6 cm/s permeability.

As part of the redevelopment of a former industrial facility in Newark, CA, treatment of volatile organic contaminated soils were required. The primary contaminant of concern at the site was ethylene dibromide. ISS treatment was performed using a deep soil mixing DSM rig,consisting of a crane; drill platform; Kelly Bar; and a 10-foot diameter auger. Forgen utilized a 12-foot diameter shroud which was suspended from the Hain platform with the Kelly bar penetrating the center access hole. The shroud was connected to the VOC vapor control system, consisting of a particle filter, two 8 foot diameter vapor phase carbon adsorbers (in lead-lag configuration) and a 40 hp, 230/460 V, 3 phase, TEFC blower (3,500 cfm @ 43” wc). All adsorbers were charged with 4,000 pounds of virgin coconut shell vapor phase activated carbon. Sampling ports were available between the carbon adsorbers and after the lag adsorber to allow breakthrough monitoring.

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