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Client:
Lilyblad Petroleum |
Background
Until recently, this relatively small RCRA permit holder operated a bulk
oil terminal in the Port of Tacoma. Historical practices at the site also
included fueling trucks and recycling solvents from car-parts cleaning
operations. Over a period of many decades, soil and groundwater underlying
the facility had become contaminated with petroleum hydrocarbons and chlorinated
solvents.
Challenges
Buildings, tanks, pavement, and utility structures covered most of this
densely developed site. Our characterization work, which would involve
extensive drilling and sampling, needed to minimize impacts to operations
at Lilyblad and adjacent facilities. In some areas, the ground was saturated
with hydrocarbons, affecting both sample integrity and safety. Such conditions
posed similar threats at an adjacent site, where explosive vapors were
detected in borings drilled inside a manufacturing facility.
Approach
To develop a detailed, three-dimensional map of the site’s geologic,
groundwater, and environmental conditions, we advanced a series of borings
into the subsurface. We also ran hydraulic tests to obtain data for a
groundwater model that would help us design and assess appropriate remedial
actions. Our interim actions focused on removing the highest concentrations
of hydrocarbons from the ground; these actions allowed cleanup efforts
to progress during slow agency negotiations.
Outcome
Within the tight timeframe ordered by the state, we completed all remedial
work, including the interim actions. Our resulting RI report was well
received; in addition, by supporting negotiations for monetary penalties,
we helped keep the company in business.