ENTACT performed remediation activities at this former battery breaking and secondary smelter site including the excavation and on-site stabilization of 265,000 tons of lead impacted soils and sediments. Prior to initiating field activities, ENTACT conducted an accelerated treatability study that significantly reduced the reagent admixture ratio without compromising stringent performance criteria for compressive strength, groundwater standards, and permeability requirements. ENTACT then implemented all required field remediation activities including excavation and on-site stabilization; installation of sheet pile and aggressive de-watering to enable removal of 20,000 cubic yards of impacted sediments from an on-site lagoon; construction of a 6-acre monolith with the treated materials, and installation of a low permeability clay cover.
Radiological NPL Site
Excavation, T&D of radiological debris-contaminated soil
Ex-situ and in-situ stabilization and chemical reduction of 205,000 cy of chromium VI impacted soils
Removal/stabilization of 2,200 cy of surficial sediments within a tidal marsh
Installation of injection wells/monitoring wells for groundwater remediation
Installation of extensive stormwater collection and management system
100,000+ cy of site fill relocated, 46,000+ tons of crushed limestone placed, and 125,000+ cy of clean fill was imported, placed, and
compacted to achieve final site grades
Restoration using natural regeneration, seeding and plugs of the marsh grass, and spartina alterniflora
ENTACT completed large-scale remediation at this former ferrochromium alloy production plant. Site activities included chemical reduction, on-site placement, and capping of 205,000 cubic yards of chromium VI impacted soils; excavation, management, and off-site disposal of Low Level Radiological Waste (LLRW) contaminated soils; in-situ chemical reduction of chromium VI impacted groundwater; installation of approximately 207 temporary injection wells, and 20 temporary monitoring wells; removal of approximately 2,200 cubic yards of creek sediments; construction of an extensive stormwater management system; capping of excavation areas (50 acres) with geotextile and an 18-inch sand layer; and final site restoration. ENTACT utilized amphibious low ground pressure (LGP) equipment to minimize impacts to the surrounding tidal marsh during excavation and capping activities.
Redox (reduction/oxidation reaction) - Chemical, mechanical, and biochemical environmental remediation processes for rendering chlorinated hydrocarbons, pesticides, herbicides, explosives, energetics, and heavy metals chemically inert or neutral in their affect on the surrounding environment. Reduction refers to the gain of electrons by a molecule, atom, or ion. Oxidation refers to the loss of electrons by a molecule, atom, or ion. One or the other of these transformations might be used to change the chemical and/or physical attributes of soil contaminants so that they are environmentally acceptable and can remain in-situ and support beneficial use. Redox is initiated by the addition/injection of chemicals, reagents, microbes, enzymes, or bacteria designed to interact with and permanently change the targeted contaminant.
Bioremediation - Bioremediation is the use of biological mechanisms to destroy, transform, or immobilize environmental contaminants. Bioremediation of hydrocarbons can be accomplished by a variety of techniques. In all cases, breakdown of hydrocarbons is maximized by providing the best conditions for microbial activity, requiring a proper balance of moisture, nutrients, and soil oxygen.
