A major petrochemical company partnered with LWR to install a comprehensive groundwater remediation system. The system extends 4,400 linear feet along the property boundary and mitigates groundwater impacts from moving off-site. The system provides treatment of the impacted groundwater associated with this 362-acre former refinery. The treatment system includes air sparging, multi-phase extraction, groundwater injection, oxidizers, air strippers, and bioplug technology.
The treatment system equipment included: six 400 scfm catalytic oxidizers, one 4,000 scfm regenerative thermal oxidizer, three 250 gpm stacked tray air strippers, three 25HP, 165 scfm compressors, 12 tanks with total capacity of 46,000 gallons, six 100 scfm blowers, nine 100 scfm heat ex-changers, two 800 gpm bag filters, two 100 gpm bag filters, five 7.5HP transfer pumps, one 10HP transfer pump, and fine and coarse bubble diffusers.
The site was divided by three railroad tracks. In order to convey water to and from various locations, three 200 foot directional borings were installed along with 2,000 feet of 6” HDPE pipe and 1,200 feet of 3” HDPE pipe. In addition, a fourth directional boring was installed under a state highway to provide natural gas to the bioplug area. LWR coordinated with the local officials and the railroad in order to gain access and permits and to establish all necessary safety guidelines.
A total of five buildings were constructed to house the treatment systems. These structures covered approximately 3,600 square feet with an additional 1,000 square feet of uncovered tank and oxidizer slabs. In addition, LWR constructed over one mile of new access roads. All system operations could be monitored and controlled either in the field or remotely through web access. LWR worked closely with the third party design firm to propose and implement field changes and design modifications during construction.