Location: Bryn Mawr, PA
Summary: During a heating oil delivery, an overfilled heating oil tank burst in the basement of a vacationing family, resulting in a spill of over 300 gallons of oil. A substantial amount of oil was collected in the French drain and sump, and discharged to the storm sewer, which flowed to a nearby stream. The French drain also allowed oil to accumulate and spread beneath the entire basement floor slab. Heating oil also seeped into the basement walls, and fumes were spread throughout the house by the forced-air heating system.
The homeowners retained our firm to delineate the extent of contamination and design a clean-up program. The site characterization results showed that oil had saturated soils adjacent to two walls of the basement and well beneath the basement floor. In addition, two cinderblock walls were saturated with oil. We designed and implemented a remedial action plan that included removal and replacement of contaminated soils, two basement walls, part of the basement floor, and extensive landscaping. Extensive shoring and other structural controls were utilized to support the house during the removal of footers and load-bearing walls. The remedial efforts were completed over a two-month period, and the house was returned to an odor-free condition.