Case Studies

Remediation & Field Services

TSCA PCB excavation

Type

Remediation

Contract Value

$2,400,000

Location

Northern New Jersey

Work Areas

Concrete crushing, TSCA PCB soil excavation, bulkhead restoration, groundwater disposal, and controlled backfill placement

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This site, nestled beneath the Goethals Bridge and along the Arthur Kill River Port, this site was abandoned and littered with large reinforced concrete building slabs, footers, foundations, debris and piers impacted with both Non-TSCA PCB’s and TSCA PCB’s. EWMI used union labor and equipment operators to delineate, break, size and removed large rebar, crush the concrete into usable grading fill and cap the site for future use as a lay down area for rehabilitation of the Goethals bridge for the Port Authority of New York and New Jersey.

A severely dilapidated wooden bulkhead was demolished and a stabilized with rip rap to rehabilitate the shoreline for later use. Each Area of Concern (AOC) was surgically excavated and carefully conveyed and staged into different waste classification stockpiles. EWMI utilized a detachable excavator bucket system to alternate between excavation AOC”s to prevent cross contamination of the PCB’s from one AOC to another. A decontamination area was constructed to wash PCB impacted attachments using a PCB bonding agent called CAPSUR®. During the course of excavations, EWMI encountered abandoned pipes containing hazardous and non-hazardous liquids. EWMI collected, drained, sheared, sized, and disposed of the piping to approved waste facilities.

Since the AOC’s were located on a parcel very close to groundwater, over 250,000 gallons of both hazardous, and non-hazardous groundwater was collected, sampled and disposed of at multiple, approved facilities. Site restoration included the capping of the entire site using the crushed concrete with a pre-approved strategic grading plan and compacted. Approximately 4,100 tons of TSCA soil was disposed of, and 2,700 tons of non-hazardous debris, and piping were disposed of.

Remediation and soil vapor extraction system installation

Type

Remediation and system installation

Contract Value

$750,000

Location

Westchester County, New York Airport

Work Areas

Soil Vapor Extraction (SVE), contamination assessment, excavation, transportation and disposal, work plan development, hazardous waste removal, QA/QC, oil/water separator removal, subcontractor management, compaction testing, sampling and analysis, debris screening, site restoration, health and safety, containment, community relations, decontamination, waste characterization, and regulatory compliance

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EWMI was contracted to excavate and dispose of contaminated soils and install a soil vapor extraction system inside a hangar at a Westchester County, New York Airport. EWMI excavated ~1,700 tons of F-Listed soils from the hangar. EWMI utilized trench boxes to shore the side walls of the excavation to allow for safe installation of the SVE system piping. Pipes installed were ~300-linear feet. Manifolds were made to enable the engineer to check organic vapor levels being drawn through each pipe. Two (2) 1,000-pound carbon units were installed as part of the system. The excavation was backfilled in one-foot lifts to meet 95% compaction.

Additional tasks included the removal of an oil/water separator and neutralization pits which generated approximately 400 tons of non-hazardous soil for offsite disposal. EWMI’s transportation & disposal division managed all aspects of the F-listed and TPH contaminated soil.

Petroleum impacted soil excavation shored by slide rail system

Type

Engineered Excavation

Contract Value

$240,000

Location

Southern Maryland

Work Areas

Engineered excavation, slide rail shoring system installation, design of engineered excavation with stamped drawings, utility support and bracing

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This design, build, perform project was extremely time sensitive for a critical real estate transaction. Two (2) AOC’s needed to be excavated and removed. This was complicated though by the fact that buildings and utilities were within and nearby the excavations. An independent structual engineer was hired by EWMI to design an engineered excavation plan to safely dig near these structures and utilities. The eight (8) week limited timeframe meant that pre-design work (geotechnical) investigation, design, drawings finalized, proofed, stamped, site mobilization, work performed, and demobilization had to be completed for this transaction to occur.

All departments within EWMI worked together to mobilize immediately upon the final design acceptance. The slide rail system was installed by EWMI’s crew and the petroleum impacted soils were removed along with “unknowns” encountered during the excavation phase. Aggregate backfill was placed, compacted, and final site restoration was provided. All transportation and disposal of petroleum impacted soils was managed by EWMI. EWMI provided expedited sampling, analysis, and approvals to allow for this disposal to occur on the tight schedule.

Wetlands remediation at former chemical research facility

Type

Remediation

Contract Value

$2,000,000

Location

Somerset, New Jersey

Work Areas

Excavation, QA/QC, waste classification, all associated paperwork, hazardous waste removal, sampling and analysis, relocation of structures, backfilling, concrete crushing, non-hazardous waste removal, transportation and disposal, subcontractor management, in-house EWMI coordinator, clearing & grubbing, site restoration, and innovative technologies

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EWMI was contracted to provide site remediation services at this former chemical research facility in Somerset, New Jersey. EWMI managed all phases of the project including the extensive permitting as well as multiple vendors to handle tasks such as electrical utility relocation services and onsite concrete crushing. Approximately 15,000 tons of soil and 2,000 tons of concrete was excavated, loaded, and transported offsite using EWMI’s large scale soil transportation & disposal program. EWMI saved the client $1,000,000 dollars by utilizing our transportation & disposal specialists to provide offsite treatment instead of incineration. EWMI provided the waste characterization and sampling plans to make this significant cost control measure happen for the client. As a result of this proactive approach by EWMI, the project was under budget. EWMI assisted in the installation of an SVE system and injection wells in conjunction with the environmental engineer by excavating trenches and restoring the site with specialized piping and materials.

EWMI installed a semi-permeable geotextile membrane to take the place of a concrete pad removed by EWMI. EWMI installed injection point risers for future introduction of treatment chemicals. An air sparging unit was utilized to handle and treat water from the excavation. EWMI contained the water, separated solids and met the specification for turbidity & solids while introducing water into the air sparging system.

Soil disposal was managed by railroad transportation by EWMI’s transportation & disposal division. EWMI saved the client additional money by utilizing rail instead of over-the-road trucking.

Acquisition and placement of wetland specific topsoil. The site restoration was performed in accordance with sensitive wetlands restoration workplans set forth by the NJDEP. EWMI performed this project under close supervision of the NJDEP Wetlands Mitigation Department.

Soil/sludge removable along active railroad

Type

Remediation

Contract Value

$5,000,000

Location

Salem County, New Jersey

Work Areas

Aqua dam installation, sheet piling, soil excavation, clay cap, QA/QC, waste classification, all associated paperwork, hazardous waste removal, sampling and analysis, relocation of structures, backfilling, concrete crushing, non-hazardous waste removal, transportation and disposal, subcontractor management, in-house EWMI coordinator, clearing & grubbing, site restoration, and innovative technologies

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EWMI was contracted to provide multi-faceted remediation services at this manufacturing facility located in Salem County, New Jersey. The project objective was to remove ~4,000 tons of impacted soil/sludge from along an active railroad as well as an 18-inch low permeability clay cap over 124,000 square feet of impacted soil.

The project challenges included the location along the waterfront. EWMI installed 1,300-feet temporary aqua dam for dewatering and excavation of impacted soils and debris along the shoreline. Excavated material was wet and had to be stabilized for transportation & disposal. Other tasks of significance included clearing and grubbing of (6) acres, installation of ~325-feet of sheet piling, demolition of onsite structures and utilities, and significant coordination of permitting and local utilities.

Site restoration included the sampling, importation, and placement of 14,000 yards of high organic content topsoil, grading of over (6) acres to specified elevations and grades including swales, spillways, and planting islands.

Helical pile excavation

Type

Remediation

Contract Value

$240,000

Location

Southern New Jersey

Work Areas

Helical pile installation, excavation beneath industrial building, design of structural engineered support plan for building, A901 certified transportation and disposal

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EWMI was hired for both the design and building/performance of an engineered excavation to remove mercury contaminated soils beneath a building from an old manufacturing plant in southern New Jersey. EWMI’s tasks of designing a structural plan to protect the support of the building began with conducting test pit/geo probe investigations along the building foundation for the structural engineers plan. EWMI and the structural engineer (independent of EWMI) worked to then formally submit a complete design which involved 26 helical piles (soil conditions, groundwater levels, and building type all play a key role in final design) and other engineering controls with formal stamped drawings. This design phase included a baseline video and photograph survey of the site.

Once the design phase was complete, EWMI mobilized to the site and established work zones including exclusion zones, contamination reduction zone (CRZ), support zone (SZ), and access control points. EWMI then saw, cut, broke, and excavated concrete flooring within the identified area. Then helical piles were installed according to the stamped plan. EWMI worked closely with the LSRP, structural engineer, and client to install each pile. All excavation of the contaminated soils within the identified areas was performed by EWMI. Contaminated soils were temporarily stockpiled as they were removed and staged on polyethylene sheeting/hay bales. EWMI protected all onsite structures, utilities, roadways, sidewalks, and other facilities throughout this project. The “as-built” excavation limits were surveyed to verify each limit was obtained. Backfill was placed in 8” lifts and compacted to 95%. Concrete was restored to match preconstruction conditions for final restoration.

To discuss your remediation and field services needs, please contact our knowledgeable client services team.