A2Z was contracted to remove
a 4,000 gallon underground storage diesel fuel tank for Uni-First.
The quote didn't include soil sampling, remediation of contaminated
soil, or replacement of asphalt surface.
A2Z scheduled a site visit with
MDE (Maryland Department of the Environment). MDE dictated how
to proceed with the removal of the UST. MDE will also decide
how to proceed if we should confront fiber optics or other wires
or pipes that would obstruct removal of the UST upon initial
excavation. If obstructions are confronted, we may be allowed
to fill the UST in place. No obstructions were found.
Miss Utility was contacted so
they could mark all known utilities in the work site. A2Z probed
the tank with a measuring stick to make sure the tank was completely
empty of product and to check the diameter of the tank.
An excavator and backhoe were
delivered to the work site by an A2Z driver. Excavation began
to expose the top and sides of the tank. The excavation site
was checked for contamination; none was found. The vent pipe,
product pipe and return line were removed. The fill pipe was
allowed to remain intact. The UST was raised, then scraped clean
of dirt to expose any damage. There was no damage found during
the MDE inspection. After the inspection, the tank was loaded
in a roll-off container for disposal. Depending on the construction,
the method of disposal will be chosen. This UST was made of steel.
Therefore, it was cleaned, tested with an LEL for (lower explosion
level), and passed MDE's requirements. Then it was dismantled
and recycled by a local scrap recycler.
If the UST had been made of fiberglass,
the tank would be cleaned, tested for LEL, then broken up and
disposed of in a local landfill. Once the UST was removed from
the site, A2Z backfilled the hole with an approved backfill material,
pea gravel.
The work site was returned to
grade, broom swept and all tools and equipment removed. A2Z then
completed the closure report with MDE.
