Site Report: ASD Turnagain Elementary School
|Site Name:||ASD Turnagain Elementary School|
|Address:||3500 West Northern Lights Boulevard, Anchorage, AK 99515|
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.
Petroleum contamination from two underground storage tanks (one 6,000-gallon Bunker C fuel UST and one 500-gallon diesel fuel UST), both used for heating the school building. Approximately 60 cubic yards of contaminated soil was excavated and stockpiled during the tank removal. Upon receipt of the laboratory results and ADEC approval the stockpiled soils were taken to Alaska Soil Recycling for thermal remediation.
|Action Date||Action||Description||DEC Staff|
|2/27/2007||Update or Other Action||During 1999, two underground storage tanks (UST) were removed from the ground at the site. The first tank excavation (7/27/99) involved extraction of a 6,000-gallon UST used to store Bunker C fuel for heating the school building. The second tank excavation (8/2/99) involved extraction of a 500-gallon UST used to store diesel range organics (DRO) also used for heating of the school building. The tanks were located in a paved parking lot to the southeast of the Turnagain Elementary School building. Both tanks were reported to be in good condition, with no holes and minimum surface rust. Both tanks had one set of vent and fill pipes. The piping extended from the tanks in a northeast direction, under an electrical transformer, approximately 20 feet to the school building. The piping was cut and capped at the base of the electrical transformer as recommended by DEC personnel on-site during piping removal. Excavations were backfilled with type II-A material from Alaska Sand and Gravel and some on-site soil determined to be non-contaminated. Field screening of the excavated soil was performed and soil segregated based on apparent possible impacts from petroleum hydrocarbons. soils were removed to a depth of approximately 8 to 9 feet bgs. A total of 14 soil samples were collected for laboratory analysis. 8 samples were collected to characterize the limits of the excavation and the remaining 6 soil samples were collected to characterize the soil removed from the ground. Confirmation samples indicated that up to 1,800 mg/kg DRO remained within the excavation. However, no volatile organic compounds (VOC’s) (benzene, toluene, ethylbenzene, & xylenes) were detected above the most stringent cleanup levels established in 18 AAC 75. Samples analyzed to characterize the soil removed from the ground contained up to 6,100 mg/kg DRO, but as with the confirmation soil samples, no VOC’s were detected above the most stringent cleanup levels established in 18 AAC 75. Approximately 60 cubic yards of soil were considered “contaminated” and transported to Alaska Soil Recycling for treatment. A petroleum sheen was reported on ponded water within the excavation, however, this is not believed to be representative of groundwater conditions, but indicative of sloughing of impacted soil above the water table into the excavation.||David Pikul|
|2/27/2007||Site Added to Database||Site added to the database.||Mitzi Read|
|2/28/2007||Exposure Tracking Model Ranking||Initial ranking completed.||Mitzi Read|
|2/28/2007||Exposure Tracking Model Ranking||Updated ranking completed.||Mitzi Read|
|3/15/2007||Record of Decision||Found ROD in ASD General File and attached it here. ROD for ASD Turnagain Elementary School dated March 15, 2007 from Jim Frechione. Action entered by Pam Clemens 12-8-08.||Jim Frechione|
|5/31/2007||Update or Other Action||Staff assignment changed from Pikul to Petrik.||Shannon Oelkers|
|2/20/2009||Cleanup Complete Determination Issued||ROD closing this site is attached, dated 3-17-08, by Jim Frechoine.||Pam Clemens|
|DRO||Other||Soil||ROD by Jim Frechoine, states that contamination that remains at site does not pose a risk to human health or the environment.|
|No ICs Required|
|Advance approval required to transport soil or groundwater off-site.|