Environmental in NJ Draft

Utility Subsurface Investigation and Remediation

OVERVIEW
Langan performed subsurface investigations, engineering design, and remediation activities on or adjacent to active electric generating stations, switching stations, and substations at various locations throughout New Jersey.

Location
Various Locations in New Jersey

Client
Confidential

Services
Environmental
Geotechnical


Haddon Avenue Corridor Redevelopment

OVERVIEW
Designated a Brownfield Development Area by NJDEP, the 6+-acre Haddon Avenue corridor redevelopment site included multiple dilapidated, abandoned, and underused brownfield sites with suspected environmental impacts. As part of the redevelopment plan, Langan helped facilitate the completion of environmental investigation and remediation activities by obtaining grants through the NJDEP Hazardous Discharge Site Remediation Fund (HDSRF) program. We also prepared and obtained approval of multiple HDSRF applications resulting in approximately $3,500,000 being allocated to Haddon Township to complete the investigation and remediation of the brownfield sites. The redevelopment plan included the creation of a mixed-use transit village with retail space, seven apartment buildings, and a community clubhouse.

Location
Haddon Township, NJ

Clients
Haddon Township
Fieldstone Associates

Service
Environmental


Redevelopment and Use of Industrial Property

OVERVIEW
Langan provided environmental and civil engineering permitting services for the redevelopment of a former transfer station positioned on a 19-acre parcel, including a 165,000-SF multipurpose warehouse structure. The environmental services included the investigation and removal of several gasoline and diesel underground storage tanks, including soil remediation and groundwater investigation, and regulatory reporting; and the abandonment of nine large-diameter groundwater supply wells per state requirements. The civil engineering permitting services included review of existing site permits, and assessment of potential flood conditions on the site. The future use of the property will be for long-term warehousing and storage of industrial supplies.

Location
North Arlington, NJ

Client
Confidential

Services
Environmental
Site/Civil


In-Situ Solidification/Stabilization Pond Closure

OVERVIEW
Langan's creative remediation approach to clean up the 760-acre site along the Delaware River included implementation of in-situ stabilization/solidification (S/S). This innovative solution ultimately saved the client nearly $6 million over more conventional forms of remediation.
AWARDS
2009 American Council of Engineering Companies, Engineering Excellence Award

Location
New Jersey

Client
Confidential

Service
Environmental


American Standard Former Trenton Pottery

OVERVIEW
Langan provided comprehensive environmental services to American Standard at the former pottery facility, culminating with the successful completion and NJDEP and USEPA Approval of a RCRA Closure Plan for lagoons, waste spoils areas and an on-site RCRA Landfill in 1993. We also conducted a series of comprehensive Remedial Investigations to support the closure and sale of the former pottery, and worked with American Standard to accomplish the cleanup and reuse of this strategically located facility by integrating practical solutions to integrate required remediation activities with site engineering plans.

AWARDS
American Council of Engineering Companies New Jersey, Engineering Excellence Award

Location
Hamilton Township, NJ

Client
American Standard

Services
Environmental
Natural Resources & Permitting


Former Manufactured Gas Plant (MGP) Sites

OVERVIEW
Langan has been investigating and designing remedies for former MGP sites under a Master Services Agreement first awarded in 1996 and renewed multiple times, based on Langan's exemplary performance.

Location
Various throughout New Jersey

Client
Confidential

Services
Geotechnical
Environmental
Data Management
Natural Resources & Permitting


In-Situ Chemical Oxidation

OVERVIEW
Langan and Viasant performed an in-situ chemical oxidation (ISCO) entailing soil mixing of iron-activated persulfate at a site located in Northern New Jersey. The large-scale soil mixing activities were completed in April and May 2015.

Langan performed a bench-scale treatability study that evaluated three different persulfate activation methods: 1) sodium hydroxide activation, 2) quick lime activation, and 3) iron activation. Iron did not need to be added because of abundant the iron mineral magnetite in the site soil. Based on the treatability test results, soil mixing with iron activation using natural iron and additional iron-EDTA was selected for field implementation.

Under Langan oversight, Viasant completed ISCO remedial implementation consisting of blending approximately 150,000 pounds of sodium persulfate, 110,000 pounds of 25% sodium hydroxide, and 1,000 pounds of iron-EDTA into a 7,000-cubic-yard mixing volume over 13,500 square feet. A dual-axis mixing head enabled even and precise mixing and dosing. The clean overburden was removed before mixing and backfilled after mixing. Before final backfilling, the top 1-foot mixing zone was stabilized with cement to increase the soil strength.

The Langan/Viasant team implemented innovative risk management procedures to ensure success. Field treatability tests were conducted on-site daily to confirm the dosages buffer reagent (sodium hydroxide), because the rapid activation and reaction drove the soil pH lower during mixing. Samples were taken from each cell upon mixing completion, and their persulfate residual concentrations, pH, and iron levels were measured and evaluated against performance criteria immediately. The mixing cells that failed the criteria were remixed till performance criteria were met.

The performance monitoring results showed that target contaminants were reduced significantly without rebound after one year. Adequate dosage and complete contact results in the successful reduction.

Location
New Jersey

Service
Environmental


3D Visualization of Comingled Chlorinated Solvent Plumes

OVERVIEW
Langan provided 3D visualization analysis of the hydrogeologic framework and contaminant transport at a former industrial facility in New Jersey. The site was characterized by a large and dilute chlorinated solvent plume that has migrated 5,300 feet within a fractured bedrock aquifer. Multiple off-site sources also contributed dissolved solvents to the comingled plume. Environmental Visualization Studio (EVS) software was utilized in order to gain a better understanding of contaminant transport in the fractured and faulted bedrock aquifer. EVS software uses advanced gridding and geostatistical analysis to create 3D models of geologic setting and analyte spatial data.

Location
Confidential Site, NJ

Client
Confidential

Service
Data Management


Selected Projects