CONFIDENTIAL CLIENT
Conroe, Texas

Remedial Construction Services, L.P. (RECON) was contracted to install a sheet-piling wall to prevent the migration of crude oil in a surficial aquifer towards the creek adjacent to the site in Montgomery County, Texas. The site was an undeveloped and moderately to heavily wooded area.

RECON was required to remove trees and grade/level the surface along the lenght of the sheeting wall in order to access the site with equipment and install the piling.The tree removal in the flloodplain area were taken down with chainsaws and the root system was left in place, except along the sheeting line.

Installation
The lenght of wall was approximately 700 feet with the depth ranging from 18 to 24 feet. Soil borings indicated a clay layer suitable for keying into at this depth. 

An interlocking vinyl sheet piling was used in lieu of steel sheets for several reasons: permeability, cost effective, and reduction of installation time. The vinyl sheeting has an extremely low permeability rate through the interlocks. It has been measured through studies conducted by the U.S. Army Corps of Engineers to have permeability as low as 2.5x10-10 cm/sec. Another reason behind the use of vinyl sheeting for this project was the overall handling of the vinyl sheets. One person can pick-up a twenty-foot sheet, which optimized the construction process to reduce installation time.
 

DOCK CONSTRUCTION
Cameron Parish, Louisiana

Remedial Construction Services, L.P. (RECON) was contracted to design-build a dock to be used during the construction of a new LNG facility. The site was formerly a dredged spoils area for previous dredging operations. The soils had little bearing capacity and consolidate extensively when subjected to loads. The work scope was to:

• Perform geotechnical soil testing to support the design;
• Prepare design documentation and drawings;
• Review design package and receive Client approval;
• Install battered pipe piles and concrete pile caps;
• Install 60-foot long, coal-tar epoxy coated sheet piles;
• Install walers and tie-back rods from sheets to pile caps;
• Install 85-foot long concrete piles for crane platforms;
• Install a heavy haul road, turn-around, and staging area;
• Install working aggregate surface;
• Design and install mooring bollards;
• Design and install riprap wall to prevent future erosion;
• Dredge 80,000 cubic yards creating 16-feet deep basin;
• Perform work with no lost-time incidents/accidents.

The bulkhead was constructed using 60 feet long sheet piles, driven with a vibratory hammer. These piles were tied back with 50 foot long Dywidag Threadbar® rods to 92 pile caps. Each pile cap was constructed on a foundation of two battered pipe piles, also 85 feet long. The battered piles had a concrete pile cap cast-in-place, which anchored the rods.

Both crane platforms consisted of 30 concrete piles, each 16-inch square by 85 feet in length. A concrete pile cap, 2-foot thick was cast on top of the concrete piles, which doubled as the working platform for the crane.

The staging area consisted of a heavy haul road constructed using a geotextile fabric and 36-inches of crushed stone. The entire area was stabilized using RECON proprietary methods to a final depth, 5 feet below ground surface. The stabilized soils were overlain with 8-inches of crushed stone as a working surface.

Dredging was performed using a hydraulic dredge with a cutter head capable of removing and pumping the clay/silt material to the designated wetlands onsite disposal area. The work was performed under the environmental permit, as well as complying with the U.S. Army Corps of Engineers regulations for discharge criteria.

Project was successfully completed with “triple-zeros”: 0 lost time, 0 OSHA recordable and 0 vehicle accidents