Langan Environmental Team on Tour

Our team of expert environmental professionals, headed by Steve Ueland, Managing Principal, is always out and about giving presentations geared towards our industry colleagues. In case you missed any, below is a list of recent presentation topics. For more information or details on upcoming presentations, be sure to stay connected with Langan on Twitter and LinkedIn. For questions, please contact Steve at sueland@langan.com.

Decision Making at Contaminated Sites: Issues and Options in Human Health Risk Assessment
ITRC – National Webinar, 1/28/2015

Environmental Compliance and Self-Auditing: How to Stay Ahead of the Regulatory Curve
South Florida Manufacturer’s Association – Broward College, FL, 1/23/2015

Vapor Intrusion for Lawyers
Webinar, 12/5/2014

NJDEP Data of Known Quality Protocols
Doylestown, PA, 10/25/2014

VI Data Usability – Making Your Case, Maximizing Credibility and Minimizing Exposure
Alpha Analytical’s New Jersey VI Guidance Update – Mount Laurel/Edison, NJ 10/21/2014 and 11/6/2014

Evaluation of the Forensic 1, 1, 1-TCA Ratio Age-Dating Method in Multiple Case Studies
30th Annual International Conference on Soils, Sediments, Water, and Energy – Amherst, MA, 10/21/2014

Source Remediation for TCE Treatment in a Heterogeneous Deposit
Langan Remediation Summit 2014 – Vernon, NJ, 10/14/2014

Geologic Characterization / High Resolution Techniques
Langan Remediation Summit 2014 – Vernon, NJ, 10/14/2014

Transmissivity as a Primary Metric for LNAPL Recovery
International Petroleum Environmental Conference – Houston, Texas, 10/14/20014

Life at Langan: Career Panel
Department of Earth & Environmental Sciences – Lehigh University, 10/9/2014

Techniques, Tools & Tips for Navigating the Ecological Evaluation & Ecological Risk Assessment Process in NJ
New Jersey Society of Women Environmental Professionals – Elmwood Park, NJ, 10/9/2014

Geographic Information Systems (GIS) for Water/Sewer Utility Asset Management
PA American Water Works Association NE District Fall Meeting – Bethlehem, PA, 10/9/2014

Q&A: What were the challenges of the Crescent City Harbor Rehabilitation Project?

Crescent City Inner Harbor

Floating docks and piles were replaced with stronger concrete versions.

A little background information

Four years ago the Crescent City Harbor, named for the crescent shaped beach south of the city, was destroyed by devastating tsunami waves generated from an 8.9 magnitude earthquake in Japan. Langan provided geotechnical engineering services during design, contractor selection, and construction for the rehabilitation of the harbor. The harbor previously consisted of floating docks, which served as slips for commercial and recreational boats, supported by concrete piles with relatively little embedment into the weak bedrock. Most of the concrete piles were sheared off by the forces generated by the tsunami waves. The project included replacing the old piles with piles designed to resist future tsunamis, stabilization of the harbor slopes, and other onshore improvements.

IMG_20130925_104248_554-retouch-LM

New foundations were constructed for the three gangway landings.

Challenges

Langan was a critical part of the project team, working closely with Ben C. Gerwick and Strover Engineering, from 2011 to 2014.  The challenges of this project included designing the facility to resist future tsunamis, shallow highly-fractured bedrock, and high seismicity and potential for strong ground shaking.

Langan’s geotechnical engineering services included developing lateral pile response analyses (L-Pile) to aid in the design of the floating boat docks, providing recommendations and design criteria for the foundations of the gangway landings, and reviewing contractor value engineering, testing, and installation logs. The lateral capacity of the piles included kinematic forces due to a design level tsunami.  In addition to foundation design, we also evaluated the stability of harbor slopes for both static and seismic conditions, and provided recommendations for increasing their stability. We used historical design documents and boring longs, as well as the result of our exploration on land and water.

Crescent City Inner Harbor

A barge-mounted drill rig was used to advance the borings over water.


Today, Crescent City Harbor is completely restored and fully operational. Overall, Langan’s engineering design services were a critical part of assisting the Harbor District in achieving their goal to recreate the harbor better than it was, with the ability to withstand future natural disasters.

 

Answer provided by Haze Rodgers, PE, GE
Haze has over twelve years of professional experience managing, developing, and performing geotechnical studies including explorations, analyses, and construction observation services for various projects throughout California, specializing in offshore design.

Q&A: What are some of the site/civil engineering challenges in Latin America?

One major challenge throughout Latin America is extensive earthwork on large land masses with poor soil conditions. Projects with hundreds and even thousands of acres are common, and typically involve the movement of millions of cubic meters of soil.

Intelligent site grading software provides significant savings in construction costs.

Intelligent site grading software helps decrease construction costs.

Grading design – often overlooked as a way to save millions on budget – is critical. Langan has successfully focused on earthwork management design to save millions of dollars at the onset of construction. Our approach combines the skills and experience of our engineers with the latest software applications to optimize grading for our clients.

Also, on large projects, we know that master planning goes hand in glove with master engineering – thinking about and considering infrastructure for the full build-out and future phases. Minimizing a project’s infrastructure investment in the initial construction phase helps bring it to life. That’s key because once a project becomes visible, further funding often becomes available.

Stabilizing/Reusing On-site Clay Oils

Clayey soils or steep slopes require ground improvement methods that strengthen the soil for long-term high performance.

Soil quality is also an issue. Much of LATAM (and especially undeveloped areas) is situated on clayey soils, steep slopes, or has seismic concerns such as liquefaction failures. Our geotechnical teams have extensive experience with ground improvement methods to strengthen the soil for long-term high performance. Our proven techniques shorten schedules from years to months. This saves clients’ money, time, and long-term reconstruction headaches while positioning their project on premium infrastructure.

Answer provided by Eric Schwarz, PE, LEED AP
Eric specializes in site/civil land development engineering, hydraulics and hydrology, storm drainage, water distribution and sanitary sewerage conveyance design. During his 20 years at Langan, he has managed dozens of major projects throughout Latin America.

Q&A: What were the technical challenges of the Park ‘N Fly project?

We asked our site/civil project manager, Katherine Regina:

What were the technical challenges of the Park ‘N Fly project?

Langan has been involved with the project since 2011, when the site was a vacant lot adjacent to Park ‘N Fly’s existing facility. Initially, we provided site/civil, geotechnical and environmental engineering services directly to the owner. When Park ‘N Fly leased the site in 2013, Langan remained on as the lead engineering consultant. Since Park ‘N Fly is based in Atlanta, GA, we added our  project management services and served as the owners representative during the complex permitting and approval process, as well as during construction and project close-out.

Katherine Regina

Katherine Regina, Project Manager

The greatest technical challenges of this project included raising the site above flood elevations and designing for future settlement (as the site is over Bay Mud), implementing stormwater quality improvements, and coordinating the design team, which included architects, structural and mechanical engineers, landscape architects and contractors. We obtained the requisite approvals from the City’s Planning Commission, Design Review Board, Building Division, and Engineering departments. The design and approval process also involved a new deceleration lane on Produce Avenue and the relocation of PG&E gas mains, regulators and electric infrastructure. The project was a C.3 regulated project and was required to meet San Mateo Countywide Water Pollution Prevention Program guidelines by treating runoff for the entire site. This was a challenge due to the high ground water table, on-going flooding issues on and off-site, and shallow existing stormwater infrastructure that had tidal influence. The project implemented state-of-the-art linear bio-retention systems that were designed to capture and treat the required runoff volume as well as detain large storm events during high tide. Finally, our team was involved throughout the construction phase of the project and provided observation and testing services including foundation and utility installations.

Park 'N Fly

Park ‘N Fly, San Francisco International Airport

Overall, Langan’s project management and engineering design services were a critical part of assisting Park ‘N Fly in achieving their goal to expand parking and create an easier way for travelers to park at San Francisco International Airport.

In Case You Missed It: Healthy Buildings and Indoor Air Quality Webinar

Recently, Christopher Glenn of Langan Treadwell Rollo’s Oakland, CA office moderated a webinar, with panelists Jean Hansen, Sustainable Interiors Manager at HDR and Todd Arris, Senior Director of Development at Kilroy Realty, to discuss healthy building environments and indoor air quality.

Wind assisted riser completions at roof level

Wind assisted riser completions at roof level

Now more than ever, the building industry is making significant advancements in efficiency, sustainability, and technological innovations. Protecting indoor air quality from contaminants that may exist in the soils beneath buildings, as well as materials, furniture, and supplies, is critical to improving and maintaining a healthy work and living environment.

The panel discussion, sponsored by AGRION Global Network for Cleantech, Energy, and Corporate Sustainability, focused on the use of vapor mitigation systems (VMS) as a means of protection of indoor air quality for new development properties. Glenn observed that protection of indoor air quality from contaminants in soils and soil gas is increasingly important given the growing number of new developments on remediated or less than pristine land. Within the San Francisco Bay Area alone, new developments are transforming former industrial properties along the shoreline into new neighborhoods, such as Mission Bay, the site of several Langan environmental and geotechnical projects. Former military properties such as Hunters Point Naval Shipyard and Treasure Island are also undergoing remediation and are poised for redevelopment. VMSs offer protection against vapor intrusion for new development on these brownfield sites or remediated properties.

VMS Portable Monitoring Equipment

VMS Portable Monitoring Equipment

A VMS typically consists of two components:

  1. A vapor barrier that is spray-applied beneath the building’s structural slab.
  2. A venting layer beneath the vapor barrier consisting of a permeable rock layer and perforated piping to capture and vent accumulated vapors from beneath the building to the atmosphere.

A VMS doesn’t have to be costly; by focusing on passively-powered and integrated systems, an ideal VMS design can be incorporated into the existing building design framework in a cost effective and sustainable manner. For example, wind turbines can provide passive but effective suction to transport accumulated vapors through the venting layer, or the venting layer and vapor membrane themselves can also serve as a capillary break and water vapor barrier, which is typically desired in new developments – even where a VMS is not required.

As indoor air quality becomes a focus of environmental health regulatory agencies, the building industry needs to continue to identify ways to protect the quality of indoor air and support healthy building.

Completed Membrane Installation

Completed Membrane Installation

What do you think? Have you encountered indoor air quality issues?

 

Christopher Glenn, PE, LEED GA

cglenn@langan.com

510.874.7074

Q&A: What makes the Pier 70 project unique?

We asked our environmental expert, Dorinda Shipman, PG, CHG, ENV SP:

What makes the Pier 70 project unique?

Pier 70 is a historic area in San Francisco’s Potrero Point or “Dogpatch” neighborhood. Langan has been involved with this project site on the environmental side since 2007 when we conducted shoreline sampling at what is now Crane Cove Park. Being part of the brownfield redevelopment at Pier 70 is especially interesting given its rich history in west coast shipbuilding and repair. Pier 70 was formerly home to the Union Iron Works and Bethlehem Shipbuilding; currently, BAE continues ship repair in a portion of the property. Due to the decades of shipbuilding and industrial activity, our site investigation results included soil gas, soil, and groundwater characterization, as well as human health and ecological risk assessment. This played an important role in progressing redevelopment plans. We are currently preparing a remedial action work plan for the Crane Cove Park near the shore area.  Langan has also performed geotechnical field investigation and analysis for Forest City in the shoreline development area and for Orton Development in the Pier 70 historic core.

As a whole, the Pier 70 redevelopment project will add new elements to the community and further connect the Dogpatch neighborhood to the expanding southeast bayfront. The waterfront site will include new retail, residential, office, and green spaces, while the planned historic core will include the rehabilitation of several existing buildings that are part of the pier’s unique history. One of the unique features of the Pier 70 redevelopment plan is Crane Cove Park, which is adjacent to the Port of San Francisco’s active ship repair yard, and includes the preservation of two historic cranes and the historic ship building slip-way.  Crane Cove Park is also part of San Francisco’s emerging Blue Greenway open space network that is providing connections to the waterfront from land and water along the southeast shoreline.   Overall, these planned features will revitalize this historic community and provide new focal points along San Francisco’s southern waterfront.

For more information about this project, visit the Port of San Francisco’s website by clicking here.

Q&A: How did the Langan team help keep the Levi’s Stadium project on schedule?

We asked the Principal-in-Charge of Levi’s Stadium and our geotechnical/seismic expert, Ramin Golesorkhi, PhD, PE, GE:

How did the Langan team help keep the Levi’s Stadium project on schedule?

To help keep the project on schedule and address geotechnical issues quickly, our team interacted directly with the Turner/Devcon team. To accelerate the work, the site was divided into four quadrants and treated as individual projects. This approach was applied from the very beginning of the construction process with grading and the installation of piles, and continued until the project was complete.  For us, this meant four individual drilling and pile installation crews working simultaneously, which required significant preplanning and preparation between our engineers, Turner/Devcon, and Berkel & Company Contractors, Inc., the piling contactor.

Through strategic logistical planning and real-time quality assurance evaluation, potentially problematic pile observations were addressed before the end of a shift, and often before the pile installation was complete. Quickly mitigating field issues helped keep the project moving forward on its aggressive schedule during the early stages of construction. Additionally, through our collaborative efforts with Berkel, piles were installed in a sequence that generally maximized production rates.

Congratulations to the 49ers on their new home and all those who helped make it possible!

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Langan project team members attended the Levi’s Stadium ribbon cutting ceremony on July 17.