Chemical Plant
ENTACT completed remediation activities at this multi-product
chemical manufacturing plant. Scope of work included
site preparation, river sediment dredging, in-situ
stabilization/solidification, and capping of the onsite impoundment. Specifically,
ENTACT completed in-situ stabilization of 9,900 cubic yards of soils in a
SWMU
containing lead and nitrocellulose powders (fuse or flash powder) to a depth
up to 9 feet to achieve lead levels less than 5 mg/L (SPLP), hydraulic conductivity
less than 1 x 10-6 cm/sec, and a compressive strength greater than 100 pounds
per square inch. Additional scope included construction of a sand buffer
zone along the riverside of the consolidation area
that is 750 feet by 10 feet wide and approximately
5 feet deep to provide an area in which monitoring
wells
can be installed; construction of a riprap revetment along the entire length
of the shoreline to prevent erosion and exposure of the stabilized uplands
soil; installation, grading, compaction, and revegetation of two feet of
cover soil over the consolidation area between
the road and riprap revetment; and
site restoration of all affected areas. |
Petrochemical and Industrial Waste
Site
ENTACT completed remedial construction activities at this petrochemical and industrial
waste site. Activities included design and operation of a water treatment plant
to pump and treat over 11 million gallons of impacted water from a former process/storage
lagoon; in-situ stabilization/solidification of 95,000 tons of hydrocarbon
and PCB impacted sludges; management of stored liquids and demolition of tanks
and incinerators; management of over 500,000 cubic yards of material to construct
a vault to contain stabilized sludge, impacted soils, demolition debris, drums
and barrels; construction of a 33-acre RCRA Subtitle C capping system; creation
of a 12-acre waterfowl habitat lake from the on-site borrow area; installation
of monitoring wells; and site restoration.
Stabilization Details: ENTACT performed in-situ stabilization/solidification
of 95,000 cubic yards of various hydrocarbon sludges and contaminated soils
to
increase their bearing capacity, while reducing the leachability
of the treated materials. UCS strengths averaged 40 psi,
while successful SPLP leachate testing was achieved for
metals, VOC's/SVOC's, and PCB's. |
| Solidification/Stabilization - Environmental remediation processes by which waste contaminants in a host medium are rendered less mobile, less soluble, chemically inactive, and less toxic by the addition of properly selected and mixed additives and/or reagents. Improving the bearing capacity and physical density of host material/contaminant improves handling characteristics, reducing contaminant solubility and stopping or reducing transfer of contaminant to surrounding environment. Measurable indicators of successful processing include leachability, chemical stability, and permeability. Resultant product or material is suitable for safe land disposal or, in some cases, can remain in place. |
