Problems/Comments

A 500-gallon used-oil underground storage tank (UST #387), a 1,000-gallon oil water separator (OWS) system, and their associated piping were removed from the ground on October 6, 2016. The UST was found to be in excellent condition upon removal; rust was not observed and seams were intact. Approximately 5-feet of piping, which ran from the used oil tank to the building foundation, was removed. The OWS was removed from the interior of the building the following day. Field screening and confirmation sampling was conducted throughout the excavation and soil stockpile. Confirmation samples contained arsenic, chloroform, and naphthalene at levels exceeding ADEC cleanup levels. Chloroform was present in the confirmation samples, the laboratory supplied trip blank, and the laboratory QA/QC sample at this location. Arsenic was detected ranging from 4.75 mg/kg to 7.05 mg/kg, exceeding ADEC criteria, but below the JBER calculated background threshold value at 9.31 mg/kg. Naphthalene exceeded ADEC cleanup criteria at one location when analyzed by 8270SIM, though naphthalene was non-detect when screened under 8260C. Fuels and polycyclic aromatic hydrocarbons, including diesel range organics and residual range organics, were detected in the excavation area below ADEC cleanup levels. Gross contamination was not identified.

Action Information

Contaminant Information

Control Type

Requirements

No associated sites were found.