Site Report: ASD East High School Former Bonfire Site
We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.
Diesel contamination was discovered in soil during site grading for a new parking lot. Anecdotal evidence indicates diesel fuel was pumped from a fuel truck onto combustibles that were then set alight as part of an annual bonfire at the high school, and evidence gathered in the field supports this.
|Action Date||Action||Description||DEC Staff|
|6/18/2012||Site Added to Database||A new site has been added to the database||Mitzi Read|
|6/19/2012||Report or Workplan Review - Other||Reviewed East High School- Road Construction Excavation Screening-Request for On Site Impacted Soil Re-Use. This document details the discovery, segregation, delineation, and sampling of diesel impacted soil found approximately 3-4 feet bgs on the west side of East High School in an area under construction for a new parking lot. Once contaminated soil was identified, it was segregated from the initial stockpile and a sample was collected to characterize the soil. The sample and its duplicate contained DRO at 383 mg/kg and 786 mg/kg respectively. GRO, RRO, and BTEX were not detected above cleanup levels. In an effort to delineate the vertical extent of contamination, excavation of the impacted area continued until field screening indicated contamination was no longer present. The sample from 7-8 feet bgs at the same location did not contain detectable concentrations of contaminants. To delineate the horizontal extent of contamination, four test pits were excavated on each of the four sides of the impacted area. Contamination was not evident in any of the four test pits, and soil samples collected 7-8 feet bgs in each test pit did not contain detectable concentrations of contaminants. Anecdotal evidence indicates this area was once used for large bonfires, where combustibles were collected in a large area, up to 80 feet in diameter, then diesel fuel was pumped onto the material from a fuel truck, then set ablaze. Evidence in the field supports this as a potential source area, as contamination was present in a distinct layer that was limited in both its vertical and horizontal extent. Approximately 52 cy of impacted soil were segregated and approved for reuse as backfill below the new asphalt parking area.||Bill O'Connell|
|6/19/2012||Exposure Tracking Model Ranking||Initial ranking with ETM completed for source area id: 79298 name: ASD East High School Former Bonfire Site||Bill O'Connell|
|6/27/2012||Cleanup Complete Determination Issued||The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) has completed a review of the environmental records associated with the ASD East High School Former Bonfire Site located on the west side of East High School at the corner of Bragaw and Northern Lights in Anchorage, Alaska. Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and this site will be closed.||Bill O'Connell|
|DRO||Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation||Soil|
|No ICs Required|
|Advance approval required to transport soil or groundwater off-site.|