ENTACT performed in-situ stabilization of 45,000 cubic yards of hydrocarbon sludges at this former waste oil pits site. Additional site activities included relocation of half-mile of an existing stream away from the former waste pits; excavation of 10,000 cubic yards of impacted sediments from within a cypress swamp; installation a 3,100 linear foot perimeter slurry wall up to 80-feet in depth; construction of an 11.5-acre RCRA compliant capping system over the entire site; installation of an extensive underdrain network which serves as a stormwater collection system; and installation of a gas collection system.
Stabilization Detail: ENTACT designed the reagent program and methodology and performed in-situ stabilization of 45,000 cubic yards of hydrocarbon sludges/sediments using a Lang Mixer to deliver an average unconfined compressive strength of 100 psi, a maximum permeability of 1 x 10-6 cm/sec, and significant SPLP leachability reduction (VOC's, SVOC's, PCB's, and metals) in the treated product as measured for the highest concentration of the most toxic components including Antimony, Cadmium, Lead, Bis(2-ethylhexyl)phthalate, and Aroclor. A TCLP extract concentration for Lead below the hazardous level of 5 mg/l was also achieved. ENTACT employed a slurried reagent application (Portland cement & water) in order to provide the best end product and to preclude the generation of VOC/SVOC emissions and airborne particulates, routinely observed in pneumatic applications. No airborne emission exceedences (perimeter or otherwise) of VOC's/SVOC's/PCB's/Particulates were observed throughout the entire process. In fact, the measurable VOC concentrations were so low that a PPE downgrade from Level C to Level D was made after continuous, integrated air monitoring.
City Park Site Remediation
City park built atop a former municipal landfill
Excavation of lead and pesticide impacted soils
Dewatering, excavation, on-site stabilization, and off-site disposal of impacted pond sediments
Installation of 1,000 LF cut-off wall at the pond
Construction of 27-acre landfill cover system w/ 10,000 LF of leachate gas collection trenches
Excavation, rerouting, lining and reconstruction of 2,700 LF of channel
Construction of storm water and waste water improvements
Restoration of the park with native grasses and plants
ENTACT completed remedial activities at this city park that was built atop a former municipal landfill. Site activities included clearing and grubbing 27 acres; management of lead and pesticide impacted soils; dewatering, excavation, on-site stabilization, and off-site disposal of impacted pond sediments, and installation of 1,000 lineal feet of cut-wall at the pond; construction of a 27-acre landfill cover system and installation of over 10,000 lineal feet of leachate gas collection trenches; excavation, rerouting, lining (164,000 square feet of 30-mil polyethelene) and reconstruction of over 2,700 lineal feet of channel; construction of 16 limestone block drop structures; construction of storm water and waste water improvements; and restoration of the park with native grasses and plants.
Barrier Walls - A barrier wall is used to divert, contain, or remediate the migration of subsurface contaminants. Barrier wall technologies include compacted clay, soil-bentonite slurry, vibrating beam, jet grouting, deep soil mixing, bio-polymer, sheet pilings, permeable reactive, and geo-membrane applications.