Site Report: ASD Chester Valley Elementary School
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.
On July 10, 2009 a 2,000-gallon diesel or bunker fuel, regulated underground storage tank (UST) was removed from Chester Valley Elementary School. This tank had been abandoned and was discovered during renovation at the school. The Anchorage School District (ASD) submitted a request to close this tank to the ADEC IPP Terminals and Tank Farms Section and submitted a closure report dated October 2009 from Shannon & Wilson. This report was received by IPP May 12, 2010 and sent to the Contaminated Sites program on June 10, 2010.
The report stated that the tank did not appear to have corrosion or holes and was covered by three feet of soil. Approximately 20 gallons of petroleum product were removed from the UST and approximately 50 cubic yards of soil were excavated during the tank removal. This soil was temporarily stored on site in a lined containment cell. The tank's concrete ballast was left in place at eight feet below ground surface (bgs) and samples were collected adjacent to the ballast at a depth of 13 feet bgs. Groundwater was not encountered at the extent of the excavation at 13 feet bgs. The excavation and stockpile were screened using a PID and confirmation soil samples were collected on July 10, 2009. Soil samples were analyzed for DRO, GRO, BTEX, and RRO. RRO was the only analyte detected at levels up to 153 mg/kg under the tank and up to 172 mg/kg in the excavated soil. After screening the excavated soil and additional material was used to back fill the excavation.
||< Method 2 Most Stringent
||No GRO, BTEX or DRO detected. RRO found up to 153 mg/kg under the tank and up to 172 mg/kg in the excavated soil. After confirmation samples were analyzed the excavated soil was used as backfill.
|No ICs Required
|Advance approval required to transport soil or groundwater off-site.