 |
Projects
Superfund Site Remediation
LEA-CIANCI
Inc. (LCI) was contracted by a fortune 50 corporation to
manage the remediation of a major Superfund site located in
Rhode Island. The site had been used as a disposal site
for municipal solid waste, industrial waste and used tires
during the 1970's. Following investigations that were
conducted in 1997 it was determined that approximately 36,000
cubic yards of soil were contaminated with volatile organic
compounds (VOCs) and needed to be remediated. LCI and
its parent company LEA proposed using a containment
building, as specified in Supart DD of 40CFR 265, to treat the
contaminated soils in place of the low temperature thermal
desorption unit which had been initially specified.
The
soils were excavated and transported to the containment
building, which consisted of a fully enclosed temporary
structure (Butler Building) where they were mechanically
aerated using a rotor tiller. Off gassing VOCs were
captured in carbon units. The per ton treatment cost
using the containment building proved to be significantly
lower than other treatment and disposal options.
Hydraulic Containment System
LEA-Cianci, Inc., installed a hydraulic containment system consisting of a horizontal well intended to confine dissolved contaminants to the shallow aquifer zone above the aquitard that extends over a portion of a facility where contaminated groundwater had been identified. Water from the horizontal well was allowed to drain by gravity into a wet well, and from there pumped into a treatment building prior to discharge to the sanitary sewer under a Connecticut Department of Environmental Protection General Permit.
The 800-foot horizontal groundwater recovery well was installed underneath the facility's floor, and then connected to a 17-foot deep wet well. An approximatly 100-foot long trench connected the horizontal well and wet well to the groundwater treatment system.
Additional trenches were added to allow for the installation of piping and utilities from the wet well to the treatment building, and from the treatment building to two discharge points. The discharge point currently being utilized is within a manhole that intersects the sanitary sewer line from the facility. An alternate discharge point has been installed to discharge to an adjancent river through an oil/water separator chamber and the site's storm sewer collection system.
SERVICES PROVIDED
Following receipt of DEP's and Town's approvals, LCI proceeded to install the hydraulic containment system. The installation of horizontal well was subcontracted. The activities performed by LCI included:
- Oversight and coordination during the installation of the horizontal well.
- Installation of wet well.
- Installation of trenches.
- Installation of treatment building.
- System start up and discharge monitoring.
- Performance of a pump test to determine desirable flow.
Removal Of Underground Storage Tanks
LEA-Cianci, Inc. was contracted by a municipality to excavate test pits, remove underground storage tanks, remove stumps/surface debris, excavate and dispose of contaminated soil and restore disturbed areas at six sites located throughout the city.
SERVICES PROVIDED
- Removal of underground storage tanks (6)
- Excavation of tests (12)
- Excavate, load and dispose petroleum contaminated soil (2100 tons)
- Pump and dispose of waste liquid and sludge (2400 gal.)
- Excavate and dispose of stumps (7 ea.)
- Excavate, load and dispose lead contaminated soil (825 tons)
Soil Remediation of Lagoons and Landfill Closure
Loureiro Engineering Associates, Inc. and LEA-Ciani, Inc. completed lagoon and landfill closure activities for a wire finishing facility in southeastern Connecticut as part of on-going solid waste management services. The project included excavation and closure of one wastewater infiltration lagoon and two sludge-dewatering lagoons. A total of 5,700 cubic yards of sludge was excavated and consolidated into the existing, on-site sludge-disposal landfill. Following excavation, a total of approximately 18,000 yd3 of backfill was installed to restore and grade the lagoon areas.
The sludge-disposal landfill was closed with an earthen cap consisting of a 6-inch sand layer overlain by an 18-inch thick layer of low-permeability soil in accordance with gradation requirements specified in the Connecticut Department of Environmental Protection (CTDEP) Solid Waste Management Regulations. A smaller, former waste disposal area was similarly closed during this project.
This project employed design criteria for landfill design, soil erosion and sediment control measures in accordance with CTDEP approved closure plans for the facility and methods and practices in the Connecticut Guidelines for Soil Erosion and Sediment Control. In addition, dewatering and stormwater management was performed in accordance with the CTDEP's General Permit.
SERVICES PROVIDED
Following receipt of DEP's and Town's approvals, LCI proceeded with work to close and cap the lagoons and landfill/disposal areas. Activities performed by LCI included:
- Overall for the project, over 37,000 yd3 of material was handled/placed for the closure of approximately 6 acres of lagoon and landfill areas. Project was completed in three months.
- Lagoons were dewatered to allow excavation and handling of sludge materials.
- Landfill surface restoration was completed with installation of over 110,000 ft2 of erosion control materials.
- Soil erosion and sediment control measures were installed including anti-tracking aprons, temporary haul roads, silt fence and a stormwater retention/infiltration basin.
- Temporary mulching was placed to stabilize disturbed slopes.
- Special plantings were provided to screen landfill areas from line-of-sight from a nearby residential area.
- The facility's existing septic system was upgraded and brought into compliance with State Health Codes.
Home | Projects | About
Us | Links | Contact Us
Ph
(860) 747-6631
Fax (860) 747-9330
e-mail:
Contact us by E-Mail
©Copyright 2002 LEA-CIANCI, Inc. All Rights Reserved.
LEA-CIANCI,
Inc. is a wholly-owned subsidiary of
Loureiro Engineering Associates, Inc.
|
