This article presents a case study of the source-area treatment of tetrachloroethene (PCE) in a low-permeability formation using zero-valent iron (ZVI). Evidence of the stimulation of biological reduction processes within the treatment zone occurred. Pneumatic fracturing and injection of microscale ZVI slurry in the overburden and weathered bedrock zones was performed at a commercial brownfields redevelopment site in Maryland. A 20,000-square-foot source area impacted with PCE at concentrations greater than 15,000 g/L was treated at depths ranging from 10 to 70 feet bgs. An average ZVI dosage of 0.0024 iron-to-soil mass ratio within the overburden zone led to a 75 percent decrease in PCE mass in less than one year. For the weathered bedrock zone, an average 0.0045 iron-to-soil mass ratio resulted in a 92 percent decrease in PCE mass during the same period. The reducing environment and hydrogen generated by the ZVI may have stimulated Dehalobacter populations, as evidenced by concentrations up to 104 cells per milliliter measured within the treatment area despite a groundwater pH as high as 9. The biological reductive dechlorination of the chlorinated ethenes explains the temporary increase in trichloroethene and cis-1,2-dichloroethene concentrations.
Case Study: Chemical and Biological Reduction of PCE by Pneumatic Fracturing and Injection of ZVI in Saprolite
Posted by langanbdm on September 23, 2013
Development, in all forms, can coexist with nature. There are, of course, examples in history that speak otherwise, but today’s developers and industrial leaders are far more environmentally conscious than in years past. At Langan, we work with such clients to assess the potential ecological risks to sensitive natural resources that may have been caused from prior site uses, and apply our technical expertise to help arrive at solutions that achieve project goals while also protecting human and ecological health.
Lofty thoughts about balancing ecological health with client objectives for site cleanup and development are always at the front of KariAnne Czajkowski’s mind when conducting ecological risk assessment studies. A Project Scientist based in Langan’s Doylestown, Pennsylvania office, Czajkowski and other scientists in the Environmental Group spend a lot of time navigating waters, hiking through forests and meadows, and slogging through marshes collecting chemical and biological data to support determinations of pre-existing or potential future ecological concerns.
“We make recommendations by carefully characterizing multiple lines of ecological evidence so that clients can make sound risk management decisions regarding how to address both the human health and ecological risk aspects of their environmental cleanup and development projects,“ said Czajkowski, who is an active member of the Interstate Technology Regulatory Council Contaminated Sediments Remediation Teams and a national support instructor for the ITRC Contaminated Sediments-Bioavailability training seminar.
Clients often state that uncertainty is a huge impediment to progress. Therefore, Langan’s ecological risk assessment services help put concerns about ecological risk in context when making decisions regarding risk management and remedy at their sites. The firm has performed countless ecological risk evaluations in many states in an effort to ensure our client’s projects are protective of our waterways, terrestrial landscapes, and associated fish and wildlife resources. Ultimately, our environmental services enable a better understanding of habitats, human and otherwise, and allow clients to reduce ecological and financial risk on their projects. And what could be more rewarding than that?
To learn more about Langan’s Ecological Risk Assessment Services, please contact Steven Ueland, Managing Principal, at firstname.lastname@example.org.
Posted by langanbdm on August 31, 2013
What do children playing in Philadelphia’s Herron Park have in common with couples shopping in West Hartford’s popular Blue Back Square? Both places were designed by landscape architects from Langan Engineering & Environmental Services. This unique group led by Michael Szura has helped breathe new life into sites ranging from neglected public spaces and blighted waterfronts to memorials, parks and redeveloped Brownfields in the New York metropolitan region.
At Langan, Szura has built something unique: a design-focused landscape architecture group within a consultancy known primarily for engineering and environmental services. Theoretically-speaking landscape architects working in concert with engineers, scientists, and surveyors under the same roof provide synergy to a range of design solutions. And in this case, reality matched theory.
Langan’s landscape architecture projects include MetLife Stadium in East Rutherford, NJ; Four Freedoms Park on Roosevelt Island, NY; Memorial Sloan Kettering Cancer Center in Basking Ridge, NJ; Canal Dock in New Haven, CT; St. Joseph’s University in Philadelphia, PA; Mannington Mills in Mannington, NJ; and DMAVA Park in Jersey City, NJ, which will provide arguably the best view of lower Manhattan from New Jersey. Clearly, the firm’s landscape architecture capabilities have added a valuable dimension to the numerous complex projects that the firm undertakes, particularly urban open space enhancement and waterfront redevelopments that help revitalize our cities.
“Every site is unique and has a history or ‘genius of place’ that’s often partially erased or hidden completely,” said Szura. “We find ways to bring those buried elements back to the surface in a relevant way. When we balance those features with the real-time jurisdictional constraints and economic goals of a project, Langan achieves what we consider the true triple bottom line—connecting people, layers and places. It’s where the practical meets the aspirational, translating design ideas into sustainable and memorable built landscapes.”
To view some major projects from Langan’s landscape architecture portfolio, click here.
Posted by langanbdm on August 6, 2013
When Langan and Treadwell & Rollo joined forces in 2010, it immediately created national and international opportunities that neither firm would have realized on their own. East met West and success soon followed. Yet, North also met South, specifically the length of California. Take for example the firm’s West Coast environmental practice, which in just three years has leveraged its experience on complex environmental and regulatory issues to expand the firm’s reach up and down the state and into the Pacific Northwest.
In California, Langan is becoming an industry leader in vapor intrusion mitigation system design. At the EcoCenter at Heron’s Head Park in San Francisco, an urban educational center that sits atop the site of a former landfill, Langan designed a passive “green” mitigation system to minimize the possibility of methane migration from the underlying landfill waste into the building. This LEED-certified project, commissioned by the Literacy for Environmental Justice, won the USEPA’s National Achievements in Environmental Justice Award. Meanwhile, in San Diego, Langan is providing environmental monitoring and consulting services during the demolition of existing structures and grading activities related to the construction of a luxury, mixed-use multi-family development.
Such activity helped catapult Langan into the ENR top ten rankings of environmental/geotechnical firms in California.
“The current economic upturn that is spurring redevelopment throughout the west has led to Langan providing property transfer due diligence and remediation of large-scale projects in multiple sectors,” said Dorinda Shipman, PG, CHG, Principal/Vice President, in San Francisco. “We are seeing more opportunities with major corporations to design treatability studies and containment systems, perform in-situ chemical oxidation and employ advanced bioremediation and solidification/stabilization technologies.”
Beyond the Bay Area and Langan’s Southern California office based in Irvine, the firm has made headway into Washington and Oregon. In Seattle, Langan is supporting the redevelopment of a site for Federal Express. And at an industrial site along the Willamette River in Portland, we are currently performing environmental services related to a cleanup under the oversight of the USEPA and Oregon Department of Environmental Quality. Clearly, these projects prove that our expertise travels well, and Langan looks forward to even more opportunities in the region.
To learn more about Langan’s West Coast environmental services, please contact Dorinda Shipman in San Francisco at email@example.com.
Posted by langanbdm on July 31, 2013
In 1998, Langan Principal George Derrick got a phone call from his client at Richard I. Rubin/PREIT (now known as PREIT). The main subject? Philadelphia. The retail developer had grown accustomed to the level of service provided by Derrick’s team in New Jersey and wondered if Langan could support future projects in and around Philadelphia. Before Derrick hung up the phone, the seed had been sown: Langan would open an office in Philly. Fifteen years later, this Center City office still thrives.
In short order, Langan expanded beyond supporting retail to become a trusted consultant for complicated urban redevelopment projects requiring Langan’s unique mix of engineering and environmental services. The challenges of constrained sites with difficult subsurface conditions in the city were ideal for Langan’s geotechnical group, and the firm’s environmental experts have supported a variety of projects from preliminary environmental site assessments to large-scale remediation, as well as compliance contracts for major corporations in the energy and petrochemical industries.
Chris Hager, Principal, currently leads Langan’s Philadelphia office. He is an expert in urban redevelopment and historic sites, and will become chairman of the Urban Land Institute’s Philadelphia District Council on July 1.
“After focusing on what makes Philadelphia the great city it is, we knew where to put our efforts and our well-rounded portfolio is proof of that,” Hager said. “The city is filled with world-renowned medical facilities, top colleges and universities, two great waterfronts and abundant public parks. To know that Langan has played a role in the development and redevelopment of spaces within the city is truly rewarding.”
Langan’s local team has helped reinvent some of Philadelphia’s most important public spaces, including Race Street Pier, Herron Park and the recently opened Hunting Park. The firm’s landscape architecture team has restored approximately a dozen parks throughout the city, and survey crews have laser-scanned Eastern State Penitentiary, parts of Amtrak’s 30th Street Station, and portions of Lincoln Financial Field.
In addition to all the work in Philly, the office also supports Camden projects, including various tasks at Campbell’s World Headquarters, Cooper Cancer Institute and Cooper Medical School at Rowan University.
Our environmental group continues to support major Philadelphia-area oil refineries and terminals while the land development practice supports clients such as Brixmor Property Group, Kimpton Hotels, Parx Casino and ongoing work with PREIT.
George Derrick was on hand last week to celebrate the Philadelphia office’s 15th anniversary, a decade and half after that important phone call. The mix of clients and partners gathered atop the Hotel Monaco (a Langan roofscape design) was proof of the office’s success, and a sure sign that the future promises continued growth.
Posted by langanbdm on June 6, 2013
Turkey has always occupied a pivotal socioeconomic position between the east and the west. The country has become an international destination, spurring unprecedented infrastructure improvements and urban development, as well as anticipation over the prospect of being the host for the 2020 Summer Olympics. Just the type of location where Langan thrives, which is why we opened an Istanbul office in the summer of 2011.
A native of Turkey, Can Karayel, PE, LEED AP spent 15 years in the United States managing projects for Langan before returning to his home country to lead the firm’s Istanbul office. Current local projects include providing site/infrastructure design services for the Tarlabasi Urban Retransformation project, which is a multi-cultural neighborhood located in the Beyoglu district. Commissioned by the Housing Development Administration of Istanbul, this 30,000-square-meter site consists of eight adjacent lots planned for the redevelopment of office, retail and residential spaces with associated site improvements. Langan also provided master plan engineering support services as well as geotechnical and waterfront engineering services for a 470,000-square-meter mixed-use and cruise line port development project in the city’s Zeytinburnu District.
“Istanbul is growing fast with a young demographic and steady migration from rural provinces, which has placed considerable stress on infrastructure, increasing the need for affordable housing,” said Karayel. “Our local knowledge, coupled with Langan’s experience working for major developers and on mega-projects, has enabled the Istanbul office to support a variety of market sectors, including office/high-rise, hotels, mixed-use, heavy infrastructure, aviation, sports, entertainment, education, cultural and healthcare. From Istanbul, we can reach anywhere in Turkey, Russia and Central Asia, and this office also serves as a gateway between local Turkish developers and contractors for work in the Middle East and North Africa.”
In addition to site/civil, environmental, and geotechnical consulting, Langan‘s globally-renowned earthquake engineering practice is being summoned to Turkey, which is a seismically-active region. In fact, the threat posed by earthquakes has prompted the need to redevelop and retrofit existing building stock, and the government has made the retransformation of these vulnerable areas a major priority.
Speaking of priorities, Istanbul is bidding for the 2020 Summer Olympics, and Langan possesses the right professionals and experience to support the work that will be needed should the city be awarded the games. George Leventis, who leads Langan International, and Ramin Golesorkhi, the Principal-in-Charge of the firm’s earthquake engineering practice, spoke at the Stadia & Arena 2013 event held in Istanbul this month. Leventis was the Director General of Olympic Works for the Organizing Committee of the 2004 Summer Olympics in Athens. Golesorkhi heads the team providing geotechnical and earthquake engineering for the new Levi’s Stadium in Santa Clara, California (home of the San Francisco 49ers and site of the Super Bowl in 2017). Langan’s portfolio of sports projects also includes MetLife Stadium, Barclays Center, and multiple soccer stadia in Iraq.
Posted by langanbdm on May 6, 2013
In order to realize the future, we sometimes must level the past … and that usually means demolition engineering. However, while the word “demolition” conjures images of countdowns to implosions, at Langan we know that modern demolition engineering takes more than simply blowing up blighted buildings.
Langan’s demolition engineering approach integrates opportunities for cost and schedule savings to avoid the duplication of activities during construction phases. Starting with a hazardous materials survey, our environmental experts prepare abatement/removal design documents as needed, and provide air monitoring services during abatement. Langan’s engineering staff performs various design and permitting activities, including demolition, shoring and bracing, and integrated site preparation planning. Perhaps most importantly, throughout the process, Langan places a major emphasis on the development of procedures for the effective reuse of materials.
“We incorporate environmentally progressive, functional recycling practices into our designs, such as the reuse of crushed concrete and masonry for backfill of basements or voids from former foundations,” said Leonard Savino, PE, a Principal based in Langan’s headquarters in Elmwood Park, NJ. “This not only reduces material disposal costs for our clients, but avoids unnecessary excavation, which saves time and reduces truck traffic disturbances in local communities.”
Langan’s demolition designs apply to virtually any site or structure. For large-scale sites, Langan can fast-track site preparation by coordinating interior and exterior remediation with phased demolition activities, as was the case with the former Giants Stadium in East Rutherford, NJ. The former 80,000-seat stadium was divided into eight parts separated by construction joints to allow for the simultaneous demolition of one segment with the remediation of another. This method expedited the demolition schedule and helped the Giants and Jets to be ready for their opening day kick-offs at the new MetLife Stadium, which is a mere 35 feet away from the old stadium.
For more information about Langan’s Demolition Engineering services, please contact Leonard Savino at firstname.lastname@example.org.
Posted by langanbdm on April 6, 2013
When the recession hit Florida in 2007, the once-hot high-rise residential market in Miami quickly cooled. Langan’s Miami office was not immune to the downturn, but after six years of widespread economic uncertainty, the office has emerged with greater diversity in projects and clientele, as well as a new office in Fort Lauderdale. Furthermore, Langan leaders in Miami sought and secured projects throughout Florida, the Southeast, Latin America, and the Caribbean, which confirmed the office’s ability to support international development.
In the early 1970s, Langan established its reputation in South Florida by providing cost-effective, geotechnical innovations, including ground improvement techniques to allow shallow foundation support for high-rise towers and large structures such as the Omni Hotel, One Brickell Square, South Point Tower, Sun Life (Dolphins) Stadium, and numerous residential towers in Aventura. More recently, the Miami office engineered award-winning foundations at the Four Seasons Hotel, the Fontainebleau Resort & Spa, Marina Blue, the Marquis, the American Airlines Arena, and the Westin Diplomat Hotel, all of which define the dynamic skylines of South Florida’s coast and urban centers.
Langan has successfully integrated environmental and site/civil engineering into its service offerings throughout Florida. Recently, Langan’s environmental group designed a treatment system to manage arsenic and sediment in dewatering discharge for the new Marlins Park. On the site/civil front, Langan engineered highly visible projects including 1400 Biscayne Boulevard and The Promenade at Coconut Creek Lifestyle Center in Broward County, as well as large residential developments in Central and North Florida.
During the recession, Langan also expanded into institutional and federal markets, providing a variety of engineering services for projects at the University of Miami, Florida International University, the Miami VA Hospital, and the Couva Hospital in Trinidad. The Miami office also played key technical roles in major infrastructure projects such as the Gulf Intracoastal Waterway Pump Station project in New Orleans, the largest pump station in the world, and the high-profile Port of Miami Tunnel.
The first large-diameter tunnel project constructed in Florida, the Port of Miami Tunnel consists of twin 42-foot-diameter tubes below the main shipping channel, connecting the port directly to an interstate highway. This connection alleviates traffic congestion in downtown Miami. Langan’s Miami office is the geotechnical engineer of record and part of the design-build team led by Bouygues Civil Works Florida and Jacobs Engineering. The project is being delivered as a public-private partnership, and is set to be completed within budget and on schedule in the spring of 2014.
“The recession was a difficult time for everyone in Florida, but it is now in our rear view mirror,” said Cristina Gonzalez, Langan Senior Principal in the Miami office. “Today, our Florida practice covers and transcends the state and country. We have become a go-to consultant throughout Latin America and the Caribbean, and with the recent opening of our Fort Lauderdale office, we can better support clients in Broward and Palm Beach Counties.”
Evidence of Langan’s leadership in South Florida was on display this month when we hosted “Miami Underground: How Deep Can You Go?” This highly-informative and well-attended seminar focused on overcoming the development, design and construction challenges presented by the region’s challenging subsurface and groundwater conditions. To learn more about the issues covered in this program and our Florida practice, contact Cristina Gonzalez at email@example.com.
Posted by langanbdm on March 6, 2013
Joe Romano refuses to answer that question, and with good reason. The survey group he leads at Langan has applied laser scanning technology in many unique locations in order to create working models of numerous iconic—and typically complicated—structures around the country.
Take the intricacies of the façade of St. Patrick’s Cathedral for example, or the complexities of the interior spaces of Madison Square Garden. In Washington, DC, Langan has scanned and created models for several federal buildings, including the U.S. District Court of Appeals and the historic Cannon House. Langan was also part of several teams awarded IDIQ contracts to capture existing conditions of GSA buildings nationwide.
In addition to gathering specific details of buildings at remarkably precise tolerances, scanning provides a safe alternative to commonplace hands-on measuring methods. For instance, Langan alleviated the need for dangerous climbing by scanning a sheer rock face on Alcatraz Island. When a power shed located atop the rails at Union Station in Washington, DC needed to be surveyed, Langan kept workers off the tracks by laser scanning the structure without stopping a single train.
“The advantages and benefits of this technology with respect to safety and accuracy alone make it worthwhile to clients, construction companies, consultants, and architects,” said Romano, Langan Principal and Director of Survey and Scanning. “Beyond that, the technology enables us to use the data creatively. The A/E industry is just beginning to explore many of the downstream uses of 3D data, most notably applications to support Building Information Modeling (BIM).”
Such advances would enhance facility operations, particularly when a building’s function has a direct impact on the bottom line, such as the industrial sector, or when an internal system could literally be a matter of life and death, as in hospitals.
The highly mobile nature of 3D technology keeps Romano’s group on-the-go. Currently, Langan scanners are deployed on an amazing variety of assignments, including several projects for theme parks in Orlando, Fl., and Anaheim, Ca. Langan is also tackling the unique challenge of capturing conditions of the massive underground stacks of books beneath the New York Public Library. And his team recently completed a detailed scan of Times Square during rush hour.
Simply put, laser scanning and modeling provide a new way to preserve the past and Langan is well-positioned at the intersection of history and the future.
Posted by langanbdm on February 6, 2013
From Geodatapoint, written by Joseph Romano
Joseph Romano, PLS, oversees the surveying, mapping and scanning efforts for Langan Engineering & Environmental Services, based in Elmwood Park, N.J. His areas of special interest include boundary law, GPS/GIS technologies, scanning, and information modeling of existing conditions. He has authored a number of articles on these topics and is a frequent presenter at key events.
During the 2012 Ecobuild America conference held in Washington, D.C., in December, I had the opportunity to team with Seth Koterba, vice president of research and technology for Allpoint Systems, on a panel discussing laser scanning and its processes.
I touched on the history of scanning, provided some examples of the various deliverables, added some practical tips on hiring a scanning provider and closed with the need to accurately collect field data all the time. Seth focused on how Allpoint Systems’ software is advancing scanning workflows to be more efficient and cost effective and improve the entire data acquisition/registration process.
At some point during the presentation, we found ourselves having an open debate on the topic of automated cloud registration versus the more traditional survey-based methods. The audience sensed the shift in format and joined in. The session quickly became an interactive conversation with the 40 or so attendees.
There was a clear divide in the room. One segment of the audience—for the most part, the younger crowd—clearly accepted the theme of improving workflows with automation. Conversely, the more seasoned participants tended to mistrust automated workflows.
Seth did a great job supporting his position. To keep the debate even, I took the opposing point of view.
Throughout the debate, I found myself recalling the days of trying to get my boss to stop writing angles and distances in a field book and use a data collector, to let the CADD system collect the points and build a surface. Now the tables were turned, and I was the one voicing resistance to technology. But I had to hold to my position for the audience to hear both sides.
Ultimately, I believe that to improve our profession we need to challenge the status quo. We must continue to think for ourselves, but we should also believe that these new technologies and automated systems work. By accepting them and finding ways to integrate them into our workflows, we will provide better service to our clients and our follow professionals.
What do you believe? Is automation friend or foe?
Posted by langanbdm on January 25, 2013