Remediation specialists in CT
Remediation specialists in CT

Remediation Experience

SOIL EXCAVATION - Fairfield County, Connecticut

AES was retained for a multi-phase project in Fairfield County, Connecticut involving soils impacted with petroleum hydrocarbons, metals and volatile organic compounds. The project involved the excavation of approximately 6,500 tons of impacted soil, of which 2,800 tons was characterized, and disposed of at an approved facility, as hazardous waste. The impacted soils were excavated from a variety of source areas, and a large portion of the characteristically-hazardous soil was removed from below the ground water table.

Dewatering operations were performed on the site, and approximately 120,000 gallons of impacted ground water was recovered and contained in 20,000 gallon fractionation tanks. On-site treatment of the water was not an option, so the water was sent off-site for disposal at a licensed facility.

One of the areas of concern at the site was an out-of-service plating waste leachate gallery. The gallery was a 6-foot by 8-foot by 450-foot long concrete and block structure that had to be demolished and removed to gain access to the impacted soil below the structure. The gallery was removed, the impacted soil was excavated, and the excavation was backfilled and brought up to grade.

This project was performed and completed while total site redevelopment was underway. AES worked together with all the involved parties to get the work completed safely and in a timely manner, all while remaining within budget.

IMPACTED SOIL EXCAVATION - Bloomfield, Connecticut

Soil at an active manufacturing facility in central Connecticut was found to be impacted from two former septic systems. AES was selected to perform this project based on the company's reputation and noted quality of work.

A large amount of clean over-burden soil was excavated and staged, and multiple utility lines were temporarily re-routed in order to gain access to the septic system leaching fields and impacted soil.

The leach field trenches and 2,000 feet of leachate pipe were removed and staged for characterization and the impacted soil was then excavated and staged. Additional impacted soil excavation was required in some areas after post-excavation sampling had been performed.

Approximately 800 tons of impacted soil and trench stone were loaded onto AES trucks and disposed of at a landfill as beneficial cover.

The staged over-burden soil and additional clean fill was utilized to backfill the area. The entire area was compacted, graded, and re-seeded. This project involved the handling of almost 8,000 cubic yards of both clean and impacted soils. Close contact with facility officials during the entire project ensured that the daily operations of the facility were not disrupted or inconvenienced by this undertaking.

PCB REMEDIATION - Southern Connecticut

AES took part in a large multi-faceted PCB remediation project in southern Connecticut and AES was assigned many responsibilities.

AES removed approximately 25,000 sq. ft. of PCB-impacted tile and 40,000 sq. ft. of PCB-impacted concrete. Portions of this concrete were up to 6-feet thick. Approximately 2,000 tons of impacted concrete was removed from small areas with very limited access, which required the use of AES' small, specialized demolition equipment to expedite the removal process. The same small, specialized equipment was used to excavate and backfill limited access areas containing several thousand tons of impacted soil.

Additionally, AES installed a new sanitary sewer line in the facility and a new series of floor drains totaling 28 drains and approximately 2,500 feet of sub-grade piping. This project also included multiple areas of asbestos abatement, which was also performed by AES.

AES was also responsible for the removal of several thousand feet of sub slab piping. In addition, several thousand feet of sub slab piping was cleaned and put back into use.

SOIL EXCAVATION - Central Connecticut

A rural site in central Connecticut was found to be impacted with fuel oils and required soil remediation. AES was contracted to perform the remediation due to our cost-effective pricing and our ability to complete the project quickly. Over a two week period, AES excavated and disposed of approximately 8,800 tons of impacted soil, some of which was removed from adjacent wetlands. The excavated areas were backfilled and restored within the required time frame and within budget.


A university in Connecticut contracted AES to remove two 10,000 gallon underground storage tanks and the associated fuel lines. The underground storage tanks were remotely located, approximately 500 feet from the building. The two underground storage tanks were excavated, cleaned, and removed from the property. Approximately 300 tons of fuel oil-impacted soil was excavated from the tank grave, staged, and disposed of off-site at an approved facility. The tank graves were backfilled and restored.

The fuel lines feeding the furnaces were successfully removed from beneath landscaped areas, sidewalks, and roadways. These areas were then restored to the university's satisfaction.


AES was hired to complete remediation on a number of different areas of concern at a manufacturing facility in Rhode Island. The areas of concern were spread across a five-acre site, and each area contained different contaminants.

Each area was excavated and the soils were staged individually, and then sampled for constituents of concern. AES managed numerous stockpiles throughout the project from site areas that varied from former septic tank and leach fields to impacted wetland soils to large sub slab and sub-pavement areas.

Approximately 6,500 tons of soil were excavated, staged, and characterized, with AES obtaining all the necessary off-site disposal approvals. Upon completion of the remediation activities, each excavation area was backfilled and restored to pre-remediation conditions.


At a large manufacturing facility in southern Vermont, AES was chosen to install a large SVE, air sparge and chemical injection system. The project involved the installation of 54 air sparging points; 28 vapor extraction wells; 16 chemical injection points; and 10 steam injection points, with a number of these points being installed in city streets and in the vicinity of a major water course. Approximately 30,000 feet of pipe was utilized in the construction of this system. A 25HP air sparge blower, and a 45HP vapor extraction blower with associated controls, were installed to operate the system. The system is still operational and continues to remediate the impacted areas and provide a safe working environment within the facility.

Concurrent with the system installation, source area excavations were completed both inside and outside the facility. Between 1,500 and 2,000 tons of impacted soil was excavated, staged, characterized, and loaded for off-site disposal at selected facilities.


AES was contracted to install a sparge and vent (SVE) system in an operational facility in Wallingford, Connecticut. Ground-penetrating radar was utilized by AES to avoid utility lines running beneath the facility. Thirteen air sparging points, 16 vapor extraction points, and the associated trenches and piping were installed beneath the concrete floor of a fully-operational facility during normal working hours.

Trenches in the concrete floor were saw-cut, excavated and removed by AES, then restored once the piping had been installed. Approximately 350 tons of characteristically-hazardous, solvent-impacted soils were removed during the trenching operation, and disposed of off-site. The system piping was directed out from under the floor and plumbed overhead in the facility. Approximately 7,000 feet of piping was installed at a height of approximately 25-feet off the floor and over 3 bridge cranes, to a mutual point exiting the facility. A 24' by 30' steel treatment building was erected, to house the system controls, which consisted of a 30HP vapor extraction blower, a 15HP air sparge blower, associated controls, and three 4,000 pound vapor carbon vessels.