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Site Report: ASD Chester Valley Elementary School

Site Name: ASD Chester Valley Elementary School
Address: 1705 Patterson Street, Anchorage, AK 99504
File Number: 2100.26.567
Hazard ID: 25524
Status: Cleanup Complete
Staff: ,
Latitude: 61.204720
Longitude: -149.747336
Horizontal Datum:WGS84

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.

Action Information

Action Date Action Description DEC Staff
6/18/2010 Site Added to Database A new site has been added to the database Mitzi Read
6/21/2010 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST site created in CSP database for source area UST #1, 2,000-Gal Diesel/Bunker Fuel, 78897 Mitzi Read
6/23/2010 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 78897 name: UST #1, 2,000-Gal Diesel/Bunker Fuel Pam Clemens
6/24/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78897 UST #1, 2,000-Gal Diesel/Bunker Fuel. Pam Clemens
7/9/2010 Cleanup Complete Determination Issued Corrective Action Complete determination issued for the Anchorage School District Chester Valley Elementary School. Contaminant concentrations in confirmation soil samples collected underneath the tank and piping run were below the "Migration to Groundwater" soil cleanup levels for this site. There was no detection of GRO, BTEX, or DRO. RRO was found up to 153 mg/kg under the tank and up to 172 mg/kg in the excavated soil. Once the confirmation testing was completed the excavated soil, and additional material, was used as backfill. Based on this information ADEC determined that no remedial action is required and this site is closed. Pam Clemens
7/9/2010 Leaking Underground Storage Tank Cleanup Initiated - Petroleum 3/14/11- Administrative action addition for reporting purposes. Bianca Reece

Contaminant Information

Name Level Description Media Comments
RRO < Method 2 Most Stringent Soil 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.

Control Type

Type Details
No ICs Required


Description Details
Advance approval required to transport soil or groundwater off-site.

Missing Location Data

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