Problems/Comments

On October 31, 1991 a 2,500 gallon diesel UST and its associated dispenser pump was removed. The following day a 3,000 gallon heating oil UST was removed from the same site. The sizes of the excavations were limited to the extent necessary to remove the tanks. Additional soil was not removed. Approximately 20 cubic yards of soil was excavated during the removal of the USTs. Soil was taken to Alaska Sand and Gravel for thermal processing. Soil samples collected from the limits of the excavation from the diesel tank indicated that total petroleum hydrocarbons (TPH) were present in concentrations up to 15,300 mg/kg. Benzene was not detected in this excavation. Two samples were collected from the excavation of the heating oil tank. TPH was present in both samples at 539 and 937 mg/kg. Benzene was present in one sample at a concentration of 0.035 mg/kg. A PVC pipe gallery was installed around the perimeter of each excavation. The excavations were backfilled with clean fill and remediation activities did not commence again until September 2003. In March 1996 Science Applications International Corporation (SAIC) under contract to EPA, released a RCRA Facility Assessment Report of ARRC properties in the Lower Ship Creek Basin. EPA designated the Former Bridges and Building Shop located at 825 Whitney as Solid Waste Management Unit (SWMU) 28. SWMU 28 was reported to have waste oil and solvent drums stored prior to being transferred to railcars or sent off site. On September 11, 2003 soil was excavated at the location of the former underground tanks and stockpiled on site to the west of the excavation. A PID was used to determine the presence of hydrocarbon contamination and the stockpiles were segregated accordingly. Soil removal continued until groundwater was reached at approximately 10 feet below ground surface. A total of 1,337 cubic yards of impacted soils was transported to Alaska Soil Recycling September 25-26, 2003. Soil samples taken from the limits of the excavation indicated that diesel range organics (DRO) contamination was still present in 3 of 14 samples in concentrations up to 447 mg/kg. Trichloroethane (TCE) was present in four samples in concentrations up to 0.642 mg/kg. Three test pits were dug at SWMU 28 to depths between one and three feet below ground surface. TCE was present in a sample taken from the test pits at the former SWMU 28 at 0.439 mg/kg. Soil stockpiles associated with the excavation and test pits were removed and transported to Alaska Soil Recycling (ASR). The soil treated at ASR was determined to meet DEC cleanup levels and was returned to the site. The treated soil was used in combination with the clean stockpiles as backfill for the excavation and test pits. The subject property is currently being used as the new Anchorage Operations Center and adjacent parking lot for the Alaska Railroad Corporation.

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No associated sites were found.