Brunswick Wood Treating Video #3 Transcript
Hello, my name is Brian Farrier, and I am EPA’s Remedial Project Manager for the Brunswick Wood Preserving Site in Brunswick, Georgia. Today, we would like to make the third in a series of videos to update the community of EPA’s activities at this site. The current work is being funded in part by the American Recovery and Reinvestment Act. This final phase of construction taking place right now is focussed on the construction of a secondary, or outer, subsurface barrier wall which you can see on the map behind me. After construction of the primary barrier wall on the western end of the site, EPA began additional subsurface investigation work as part of the groundwater treatment component of the remedy. As part of this work, we found free product in the subsurface. It was determined at that time that it was not cost-effective to treat this free product via chemical oxidation. For that reason, we moved forward with plans to encapsulate this contamination with the secondary, or outer, barrier wall. As you can see behind me, this secondary barrier wall will tie into the primary wall, it will extend across Perry Lane Road, extend to the west, cross Perry Lane Road again, and will follow the CSX railroad tracks. Before this work could begin, we had to work very closely with the Atlanta Gas Light company, the Georgia Power Company, and with Glynn County. I would like to show that preparation work, in addition to the construction work that is taking place right now. Why don’t we step outside and take a look at that.
I’m now standing on Perry Lane Road, and to my right and behind me, you can see where the secondary barrier wall is being begun. It is currently being tied into the primary wall on the western end of the site. Ahead of me and behind me, you can see the signs that have closed Perry Lane Road, in preparation for the first crossing of the barrier wall. To my left is the county’s water line, let’s go talk about that for a minute.
On November 30th, a temporary bypass was built that will allow the secondary barrier wall to make its first crossing of Perry Lane Road. Later, this first temporary bypass will be shifted and the barrier wall extended to the west. Then, when the barrier wall makes its second crossing of Perry Lane Road, a second temporary bypass of the line will be used, and a similar process followed as the barrier wall is extended southward along the CSX railroad tracks.
EPA also worked closely with the power company to address the power lines on this end of the site. On November 29, the low voltage distribution lines were temporarily removed. For the high voltage lines in this area, a de-energizing process will used as the barrier wall is constructed underneath the lines. A similar de-energizing process was used during construction of the primary barrier wall in 2009. I’d like to talk to you now about the gas pipeline near Burnett Creek.
At the intersection of Perry Lane Road with Burnett Creek, there is a gas pipeline that also needs to be addressed as part of the current construction work. This gas pipeline will have a permanent bypass built that will allow the barrier wall to be extended southward along the railroad tracks. This permanent bypass lineis scheduled to be built later this month, December 2010.
On behalf of the Environmental Protection Agency, I would like to thank representatives of the Atlanta Gas Light Company, the Georgia Power Company, and Glynn County as we all worked together to address these relatively complex construction issues that we faced at this time. I would also like to thank the BellSouth Company for their assistance in relocating their fiber optics telephone line. At this time, let’s go take a closer look at the actual construction work on the secondary barrier wall.
Here, you can see construction taking place on the secondary barrier wall behind me. And because this is a construction area, you can see that I have my safety equipment on . The technology being used on this secondary wall is different, and more expensive, than that which was used on the primary wall last year. The two primary walls that were built on the eastern and western ends of the site used a process where excavated soils were brought to the surface, then mixed with offsite clay and bentonite to form an engineered backfill mix that was then placed back in the trench to form the wall. With this technology, soils are not brought to the surface. Instead, they are mixed in-place with bentonite and cement as the cutter bits drill downward. Note that the cement being used here serves essentially the same purpose as the offsite clay used in the primary wall, and achieves the same design specifications. Also, because soils are mixed in-place, this technology can work more easily and closer to the things we’ve been talking about like the road, the gas pipeline, and the railroad tracks.
In conclusion, there are a couple of final points that I would like to make today. [First of all], the major components of EPA’s original remedy at the Brunswick Wood Preserving site remain unchanged. Contaminated source materials in the subsurface are being contained with barrier walls, and an engineered cap will be placed on top. Meanwhile, contaminated groundwater outside the footprints of the wall/caps will be treated via chemical oxidation. Also, with respect to the schedule, we anticipate that the secondary barrier wall and engineered cap will be completed by February 2011.
As always, we appreciate you watching to keep up with EPA’s activities at the Brunswick Wood Preserving site. If you have any further questions, you may email me or you may call EPA’s toll-free phone number [at the number listed] below.
Thank you very much.