The project’s general contractor selected the site-preparation pros at Highways, Inc. to do the job. Highways was given just 2½ months to deliver the initial phase of the project, which included the building pad and its immediate surrounding area. To make sure they had the right equipment, Highways contacted Chris Flake, Sales representative with their Metso dealer, Scott Construction Equipment in Lavergne, TN.
Highways, Inc. was founded in 1960 in Brentwood and Cookeville, Tennessee, as a grading, storm drainage, and earthmoving contractor. Over the years, the company has moved millions of cubic yards of earth on grading projects. These projects have included state highways, site developments for large corporations, and federally funded projects. Today, in addition to the grading business, Highways has asphalt, bridge, aggregate and sand manufacturing divisions.
While the site was ideal for a new store, the hilly terrain of Central Tennessee and the area’s unique sub-surface rock formations presented a number of challenges to transform it into flat, usable land.
“Preparing the site and creating the building pad was a huge challenge in itself,” says Tom Sewell. “Plans called for four feet of 12-inch minus rock, covered by one foot of four-inch minus rock. Plus, materials demands had to be met for a drainage field, and foundations and backfill for 30-foot by 1000-foot landscaping walls on two sides of the main pad site. And it all had to happen at the same time.”
With Sewell’s help, Highways selected a Lokotrack LT1213 impact crusher to feed a Lokotrack ST3.8 mobile screen to produce three end-product sizes. The LT1213 is outfitted with a Nordberg NP1213M impact crusher engineered specifically for mobile applications, with a reinforced frame and larger feed opening. Additionally, a Lokotrack LT106 jaw plant was selected for the project and dedicated to producing only base #12 stone.
Seven feet of soil had to be removed before getting to the proper rock to be used. “If the land wasn’t tough enough, the weather was against us,” observed Todd Martin, the Site Supervisor. “It seemed like it would never stop raining.”
A hilly worksite and wet conditions weren’t the only tests that Highways had to face. Just under the surface, a limestone karst formation had to be removed. Karst rocks have fissures that naturally gather clay and soil, something that only gets worse in the rain.