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Home arrow Archives   The American Surveyor     

Hard Work, Miserable Conditions—Surveying Tennessee'S Cumberland Trail Print E-mail
Written by Brad Longstreet   
Thursday, 21 October 2010

A 2.870Mb PDF of this article as it appeared in the magazine—complete with images—is available by clicking HERE

Land surveyors are often attracted to the trade by the prospect of working outdoors, preferably in the woods. But even so, the surveyors at The RLS Group must have wondered if they were getting too much of a good thing when they spent 90 days surveying a 19-mile section of the soon-to-be-completed Cumberland Trail . . . especially since it snowed or rained nearly every day, with temperatures that dropped to as low as three degrees and rarely got above freezing. And they weren't returning to motels at night. Since travel in the region is only possible with four-wheelers, and since the work took place far from cities or major roads, RLS employees worked and camped in the field. They lived in tents for one to two weeks at a time, working every daylight hour. Terrain was also a challenge; this part of Tennessee is heavily wooded and very hilly, with steep ridge lines extending for miles.

"I spent about three weeks up there. I wouldn't have missed it," says RLS Group founder M. Shane Loyd, PLS, "but I have to admit, I was glad to get home too!" The RLS Group, based in Chattanooga, Tennessee, has been around since 1999. Starting in 2007, they began to offer scanning and have established a good reputation for applying cutting edge techniques and equipment to surveying projects. On the Cumberland Trail project, the survey equipment used was Leica's Viva GNSS system.

"We picked up two systems and I think we were the first firm in the South to have one," says Loyd, laughing, "Even the Allen Precision guys hadn't been fully trained yet, so in some respects we were on our own. We got them out of the box and drove straight to the job, so it was a tough test for new equipment. Fortunately, the system worked great."

But it wasn't just new equipment that made this project a success. Rather, it was surveyors doing what they do best, completing work in difficult conditions and blazing trails for others to follow. Surveying isn't always the easiest work in the world but it is, fairly often, the most beautiful.

The Cumberland Trail
The Cumberland Trail in Tennessee, which is inspired by the popular and crowded Appalachian Trail, begins at Cumberland Gap National Historic Park and ends just outside Chattanooga. Currently, 117 miles of trail--out of more than 300 proposed miles--are completed, and remaining sections are being added about as fast as they can be surveyed and developed. The 19-mile section surveyed by RLS stretches from the park to LaFollette, and includes the historically significant McClean Rock, where Justin Wilson and others are said to have been standing when they conceived of the trail.

In this case, the Molpus Timber Company, along with several private owners, owned most of the land being acquired for the trail. Legal descriptions and maps were needed to complete the transfer, and RLS crews also set rebar, Carsonite posts, and painted as needed to identify the trail alignment. As part of the transfer process a private group, The Trust for Public Land (TPL), temporarily owns new acquisitions before being transferred to state agencies. Everyone involved wanted to minimize the period of private ownership, which explains the short time frame of the survey. "The negotiations involved kept pushing back our start date," Loyd says, laughing, "but somehow that didn't push back the due date. We'd originally planned on six months to do this work, but ended up having to do it in three!"

Why in Winter?
During the eleven weeks that RLS crews worked and camped in the Tennessee bluffs, a total of 60 inches of precipitation fell. Snow was bad enough, but "Rain was worse," according to Loyd, "because we'd get soaked, the equipment would get soaked, and rainy days were still extremely cold." Many days were so cold and uncomfortable that work would stop midday just to build fires and warm up. And because winter light is scarce, workdays were relatively short and crews would cook, melt water, and tend to survey chores in the dark. All of which begs the question, `Why do this project in the winter?'

"Even with the cold and the snow, winter was better," explains Loyd, "Because of the deciduous foliage, it was easier to see and to get around without clearing a lot of brush. This was a major factor for us when using the Viva system in order to meet our deadline." The area is also "snaky", with large populations of rattlesnakes, copperheads, and even bear that hibernate in winter. Mosquitoes and other insects are gone as well. "We'd see elk and coyote tracks, and that was about it for animal encounters," says Loyd, "Most of the time it was so cold we didn't even spot squirrels."

So, all things considered, winter really was the best time. But that meant surveying, camping, cooking, battery charging, calculations, and all the other business of life and work had to take place in extreme conditions, several hours from the nearest city. It was a severe test for both humans and survey equipment.

Surveying the Trail
The actual project requirements were straightforward. RLS was asked to locate and mark underlying parcels in the area, create a 200-foot wide trail corridor, mark the corridor with rebar, Carsonite posts and paint, and provide maps and legal descriptions of the corridor. Simple enough as boundary surveying goes, but in addition to the ever present weather and terrain there were other significant challenges.

"Parcel descriptions around here go back to the North Carolina Land Grant of 1785, before Tennessee was even a state," Loyd explains, "and the scribed trees that were called to just don't exist anymore. Other descriptions made very vague calls like `bluff lines' or `top of ridge' and it can be very hard to know exactly where these lines are now."

Even though this wasn't a topographic survey, interpreting available descriptions meant that bluffs and other features had to be located. "With all the one-to-one slopes out here, and the snow cover and the brush, traversing with total stations would have been ridiculous," says Loyd. "Fortunately, the Viva GNSS system really came through for us. We put it to the test and we were never disappointed by the reliability, accuracy and durability of the equipment." On a good day, crews could locate about two miles of ridgeline a day, sometimes crawling through mountain laurel patches to find clear spots. In some areas, a realtime kinematic network (RTN), operated by the Tennessee Department of Transportation was available, and in other areas RLS relied on static surveying. "We always had the coverage we needed," Loyd says, "We did have some issues on the northwest side of steep ridges, but even there we learned what times of day we could work and it wasn't a problem."

Loyd, and Project Manager Scott Carter, PLS, also gathered a lot of parol evidence to help with boundary work. Owners would come out on weekends, on four-wheelers, to meet with the surveyors and relate what they knew about boundaries. In many cases they had knowledge of longstanding agreements about the precise location of vague topographic calls, or could point out the minimal existing monumentation. "In the entire 19 miles we surveyed," says Loyd, "there were only about 20 points I could really `hang my hat on.' But with the evidence we gathered we were able to put together a solid boundary."

A brand new survey system and data interface could have been a problem, but the Viva system worked very well, according to Loyd. "We've been using Leica products for a long time, and we were sure the new system would work out." Even so, Loyd and Carter were very happy with how quickly employees picked up the new system. "It took just a few hours and everyone was able to do everything with this system," says Loyd, "the menus and the buttons are very clear, we were getting satellite lock with exceptional speed and reliability, and everything held up well in the cold and damp. Basically there was no learning curve. We couldn't be happier with how well Viva worked for us."

Since part of the job was to create and mark the corridor on the fly, crews used the Viva Field to Office feature with the cellular link to upload data at the end of workdays. An RLS office technician would stay late to download the data, calculate an alignment, and upload the alignment to the site. In the morning, crews would log in, download the alignment, and get to work. "We could have done the calcs in the field," says Loyd, "but that would really have cut into the time available for survey work and camping chores. The cellular links worked very well for us and made life a lot easier."

To mark the trail corridor boundary, crews set rebar every thousand feet and at angle points. To aid trail construction, intervisible Carsonite posts, and lots of paint, were set. Given the terrain and conditions, marking a mile of corridor was considered a very good day.

Camping Rough
Winter camping, hours from help, is no joke and safety was a serious consideration. All employees assigned to the Cumberland Trail project received training in first aid, CPR, and basic survival. The first aid training came in handy when Loyd cut his thumb with a machete. RLS staff also carried SPOT personal GPS systems, which track the carrier's location continuously and transmitted signals to the RLS office and to local sheriffs' departments. Office staff could track all employees in the field and, in an emergency, simply pushing a `911 button' would have told first responders exactly where to find distressed employees.

Rock Creek Outfitters, a local firm that supports the Cumberland Trail project, sponsored camping equipment. "They provided the tents, sleeping bags, boots, clothing and other supplies we needed, all at cost," says Loyd, "Which was great, because we really needed the best possible equipment. There were no campgrounds--we'd find the flattest spots we could and set up." Lean-tos and tarps were set up in several configurations to block snow coming from different directions, and employees shared their tents with survey equipment to keep it as dry and warm as possible overnight. They would also melt snow and keep the water in tents so that it would be available the next morning. A 1,000-watt Honda camping generator charged batteries, and chargers were bundled in foam boxes to keep them warm enough to charge. "We were pleasantly surprised by the new system's battery life," says Loyd, "Even with the cold, batteries lasted all day."

Cooking was kept simple. "Scott's wife Michele, my sister, did all the cooking for us," explains Loyd, "She'd cook all the meals for a week or so and freeze it in plastic bags. All we had to do was boil water and reheat the frozen meals. We ate very well--we had steak, homemade stews and chili, cheddarwurst, you name it."

In all, RLS set up six base camps, and moving camp took a day. Most employees were rotated out after a week, but on two occasions Carter spent two weeks in a row camping and working.

In some ways, the Cumberland Trail project resembled surveying from the sectional survey days. Crews spent weeks in the field, living rough, and dealt with tough conditions every day. In other ways it seemed like the future thanks to the use of progressive GNSS systems, cellular uplinks, and personal GPS beacons. By bringing together the skills of the past and equipment of `right now', The RLS Group was able to complete a project that will benefit future hikers for generations to come.

Brad Longstreet is a freelance writer who specializes in AEC topics.

A 2.870Mb PDF of this article as it appeared in the magazine—complete with images—is available by clicking HERE

 
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