Geosyntec received an Engineering Excellence Award for Kinder Morgan's Elba Island Salt Marsh Restoration Project, designed by Geosyntec, from the American Council of Engineering Companies (ACEC) Georgia, in February, 2016.
The restoration of 1.9 acres of historical salt marsh and 2.5 acre upland buffer was necessary not only for the continued operation of the facility but has proved to be a benefit to Southern LNG Company, LLC (SLNG) for the future expansion of the Terminal to liquefy domestic natural gas for export. The Elba Island Salt Marsh Restoration Project was a critical path project in order to maintain operations at the liquefied natural gas (LNG) import terminal at Elba Island owned and operated by SLNG, a subsidiary of Kinder Morgan.
Elba Island (780 acres) is located in the Lower Savannah River Harbor approximately 5 miles east of Savannah, Georgia. To support continued operations and allow for LNG deliveries, approximately 1.25 million cubic yards of maintenance dredging is permitted annually to maintain SLNG's marine berth and ship turning basin in the Savannah River. The receiving point for this dredge material is an approximately 240-acre upland dredge material containment area (DMCA).
Since 1998, Geosyntec has provided the geotechnical engineering for the DMCA management, which requires periodic dike raisings to create additional storage for annual dredge material disposal. In 2006, preparation began for the next dike raising, which would require a significant lateral expansion to maintain geotechnical integrity of the exterior dikes along the south and east side of the DMCA. By 2011, environmental permits were still in limbo because mitigation options for impacts to the tidally influenced ditch surrounding the DMCA were not materializing into viable options. With the southern DMCA nearly full, Geosyntec proposed an innovative plan to provide the required mitigation on Elba Island by restoring a historical salt marsh that currently lies under three to five feet of historical dredge spoils from the 1940s and 1950s. To do this, Geosyntec approached the Federal and State regulatory agencies with an established scientific assessment methodology as the framework upon which a novel calculation methodology was developed for sizing the salt marsh restoration to equal the functional capacity of the tidal ditch to be filled. The agencies ultimately approved the methodology, and in August 2013, the construction of the Elba Island Salt Marsh Restoration Project was successfully completed. To further protect and enhance the restored marsh, SLNG restored a 2.5-acre 50-foot wide upland buffer parallel to the restored marsh, which was 2,200 feet in length (longer than six football fields).
One year after completion of construction, the project was already meeting its 5-year performance measures, which exceeded everyone's expectations including those of SLNG, Geosyntec, and the regulatory agencies. Further, the Federal and State regulatory community, having seen the project's success first-hand, endorsed Geosyntec's assessment and design methodology and have called it a "model" for other salt marsh restoration projects in Georgia. The success of the restored marsh establishing so quickly and performing at the five-year performance goals affirmed the successful approach of the multidisciplinary team's concept that "process defines form and function." The Geosyntec team dedicated the time needed to understanding this unique ecological resource, and the natural processes that create sustainable ecological conditions.
Geosyntec team members who contributed significantly to the success of this project include: David Vance (Georgia), Kwasi Badu-Tweneboah (Florida), Rutu Joshi (Georgia), Cristin Krachon (Georgia), John Ash (Georgia), Ramil Mijares (Florida), and Caroline Nelson (Georgia). The team was also joined by Scott Walden, our client from Kinder Morgan, who received the award.
As part of a significant investment in the partnership between our firms, Geosyntec was invited and will attend the Kinder Morgan Supplier Showcase May 10-12, 2016 in Houston, Texas.
For more information regarding, the Ellba Island Award visit: https://youtu.be/X37EK5fFyvM