Excavation, Concrete Demolition, UST Removal including Transportation, and Disposal of Soils contaminated with petroleum hydrocarbons
Work Description
– General:
Chase Environmental Group
(Chase) was contracted for the removal of three UST’s, excavation,
transportation and disposal of all contaminated materials,
the treatment of impacted groundwater and the restoration
of the excavated footprint back to original grade.
The three UST’s consisted of (2) 30,000 gallon and (1) 15,000
gallon steel lined concrete tanks, which were installed
in the 1940’s. The excavation footprint necessary to remove
the tanks and the contamination plume was approximately
300’ x 65’ x 42 ft deep. An auger cast pile shoring system
was installed to a depth of 60’ around the entire footprint
to provide wall stability during excavation. Due to the
extent of contamination, the excavation depth went approximately
15’ fellow the groundwater table. Once the contaminated
soils were removed Chase employed a mobile oil recovery
system and a mobile groundwater treatment system to clean
the impacted groundwater to required limits.
Two underground concrete vaults approximately 35,000 gallons
in size were uncovered during excavation activities. These
vaults along with an underground coal silo, three foot thick
concrete slab, foundation footings and coal conveyor system
were demolished and the concrete and reinforcing steel disposed.
Over the course of the project Chase excavated and disposed
of approximately 40,000 tons of contaminated soil and debris,
recovered approximately 30,000 gallons of free product oil
from the water table, treated approximately 1.3 million
gallons of water and placed approximately 28,000 cubic yards
of backfill material to required compaction specifications.
The project was completed in nine months, well within the
contractual timeframe, and at a cost which was under the
client’s budgeted amount.
