Integrated Engineering and Environmental Services
When it comes to environmental solutions, all clients want to do the right thing, but they also need to know the right way. Langan truly partners with you as a technical and regulatory advocate. We work together with you to overcome complex scientific obstacles and guide you through complicated governmental policies so that you can achieve your objectives. Our success spans four decades, a testament to the longevity of our client relationships and our ability to provide innovative and integrated services for every type of environmental challenge. Put simply, it’s environmental advocacy, from initial investigation to final design, so that you can do the right thing… the right way.
SERVICES PROVIDED INCLUDE:
- Site assessment, design, and remediation
- Brownfield redevelopment
- Transactional due diligence
- Sediment characterization and remediation
- Human health and ecological risk assessment
- Natural resources and ecological restoration
- Regulatory compliance and permitting
- Air quality and industrial hygiene
- Treatability studies
- Technical support for environmental litigation
Hudson Yards Redevelopment

Location
New York, NY
Client
Hudson Yards, a Related Oxford Venture
Services
Geotechnical
Environmental
Site/Civil
Traffic & Transportation
Traditional Surveying
Terrestrial Scanning/BIM
Architects
Kohn Pedersen Fox
Skidmore, Owings & Merrill
Diller Scofidio + Renfro
Ismael Leyva Architects
Rockwell Group
Strategic Partners
Thornton Tomasetti
WSP
Mannington Mills

Location
Salem, NJ
Client
Mannington Mills, Inc.
Services
Natural Resources & Permitting
Environmental
Landscape Architecture
American Standard Former Trenton Pottery

Location
Hamilton Township, NJ
Client
American Standard
Services
Environmental
Natural Resources & Permitting
Keystone Industrial Port Complex

Hershey Facility – ACT 2 Closure Activities

Verizon Pennsylvania, LLC – Air Quality Permitting and Compliance

The Shops at Atlas Park

2007 US Environmental Protection Agency Region 2, Phoenix Award for Excellence in Brownfield Development,
2007 American Council of Engineering Companies, Engineering Excellence Awards, Gold
Location
Glendale, NY
Clients
A & Co.
The Hemmerdinger Corporation
Desman Associates
Services
Environmental
Geotechnical
Site/Civil
Traditional Surveying
Bronx Terminal Market

Location
Bronx, NY
Client
The Related Companies
Services
Environmental
Geotechnical
Site/Civil
Architects
GreenbergFarrow
BBGM
Strategic Partner
Thornton Tomasetti
Distribution Facility

Schlage Lock Factory Investigation and Remediation

Cascades Park

Fort Lauderdale/Hollywood International Airport

Treasure Island/Yerba Buena Island Redevelopment

Location
San Francisco, CA
Clients
San Francisco Public Utilities Commission
Treasure Island Development Authority
Services
Environmental
Geotechnical
Site/Civil
Stockton Events Center

Location
Stockton, California
Client
Stockton Housing and Redevelopment Agency
Services
Environmental
Geotechnical
Architect
Heinlein Schrock Stearns
Audit and Air Compliance Services

Ohlone Community College

Location
Newark, California
Client
Ohlone Community College District
Services
Environmental
Geotechnical
Architect
Perkins+Will
Related Santa Clara

Location
Santa Clara, CA
Clients
Related Urban
City of Santa Clara, California
Services
Site/Civil
Environmental
Geotechnical
Former Gas Plant Remediation & Ecological Restoration

In-Situ Chemical Oxidation

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.
Former Manufactured Gas Plant (MGP) Sites

Location
Various throughout New Jersey
Client
Confidential
Services
Geotechnical
Environmental
Data Management
Natural Resources & Permitting