| Action Date |
Action |
Description |
DEC Staff |
| 9/1/2012 |
Document, Report, or Work plan Review - other |
A Corrective Action/UST Characterization Report, dated September 2012, documented additional excavation activities at this site. Field activities commenced from June 11 through 14, 2012. Because of buried utilities, the excavation was subdivided into three separate excavations; A, B, and C. The UST was removed from Excavation B. The tank was supplied by a 2.5-inch diameter, steel pipe that extended from the maintenance shop floor drain to the UST. Holes were discovered in the bottom of the UST, indicating that the UST was utilized to facilitate the drainage of fluids into the subsurface soils and retain solids in the tank (similar to a septic crib). Five confirmation soil samples were collected during the course of the UST removal and were analyzed for gasoline range organics (GRO); diesel range organics (DRO); residual range organics (RRO); benzene, toluene, ethylbenzene, and xylenes (BTEX); resource conservation and recovery act (RCRA) metals; volatile organic compounds (VOCs); and polychlorinated biphenyls (PCBs). The 2.5-inch supply pipe was capped with concrete and a “biovent piping arrangement” was placed at the base of the UST excavation prior to backfilling with clean fill.
The combined size of all excavations (A, B, and C) was approximately 1015 square feet (ft2). A total of 22 confirmation soil samples, including 2 duplicate soil samples, were collected from Excavations A, B, and C (not including the soil samples collected during the UST removal). These soil samples were analyzed for GRO, DRO, RRO, BTEX, and polynuclear aromatic hydrocarbons (PAHs).
DRO contaminated soil remains above the approved cleanup level in all three excavation locations, at concentrations ranging from 275 mg/kg to 3,230 mg/kg. In the UST removal location, concentrations of GRO at 800 mg/kg and 1,2,3-trichloropropane at 0.171 mg/kg remain at the base of the excavation. Contaminant concentrations likely remain beneath the airport maintenance building at similar concentrations.
All excavated soils were segregated based on contaminant source (AST or UST) and stockpiled separately in lined, land farm storage cells.
|
Joshua Barsis |
| 1/7/2013 |
Update or Other Action |
On this day, the DEC received a Conditional Approval of Permanent Closure of One Motor Vehicle Waste Disposal Well (the UST removed in 2012) for this site from the U.S. Environmental Protection Agency (EPA). Pursuant to the EPAs authority under 40 CFR 144.89(a)(1), the motor vehicle waste disposal well was permanently closed with the following conditions: 1) Because the levels of DRO, GRO, arsenic, and TCP were detected above ADEC cleanup criteria in the confirmation samples, ADOT&PF must continue to work with the ADEC to address the remaining contamination. 2) EPA normally requires that confirmation samples be analyzed for SVOCs by EPA 8270; however, because the samples were analyzed for DRO and RRO, and because the waste disposal well was originally thought to be a UST, the EPA will accept the more limited 8270 SIM parameters for this well closure. 3) ADOT&PF should evaluate the potential impacts to groundwater and the nature and extent of groundwater contamination (if any). 4) The contaminated stockpiles must be disposed of or treated in a manner appropriate with the contaminant concentrations. |
Joshua Barsis |
| 1/23/2014 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 1/23/2014 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST site created in CSP database for source area 1,000-Gallon Used Oil UST #1, 79586 |
Mitzi Read |
| 1/27/2014 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79586 name: 1,000-Gallon Used Oil UST #1 |
Joshua Barsis |
| 2/3/2014 |
Document, Report, or Work plan Review - other |
On this day DEC received a Land Farm Testing Report, dated October 9, 2013. The report documented two land farms (AST and UST) produced from the 2012 excavation at this site. The AST land farm was approximately 10,000 square feet in size. Thirty six soil samples were field screened from the AST land farm and, based on field screening results, ten confirmation soil samples, including a duplicate soil sample, were submitted for laboratory analysis. The UST land farm was approximately 900 square feet in size. Two confirmation soil samples were collected from the UST land farm and submitted for laboratory analysis. All twelve of the soil samples were analyzed for GRO, DRO, RRO, and BTEX. Concentrations of DRO were detected at a maximum concentration of 850 mg/kg in samples collected from the AST land farm; which exceeds the ADEC cleanup criterion of 250 mg/kg for DRO. None of the samples collected from the UST land farm exhibited contaminant concentrations that exceeded the ADEC cleanup criteria; however, based on previous investigations in 2012, the UST land farm is destined for offsite disposal at a later date. |
Joshua Barsis |
| 2/3/2014 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
Administrative action addition for grant reporting purposes. |
Evonne Reese |
| 4/3/2014 |
Update or Other Action |
On this day, the DEC received correspondence from the DOT indicating that there are no drinking water wells located within 1,500 feet of the site. The letter indicated that all water is obtained from the water treatment plant located approximately 1,665 feet from the site. This information was reportedly provided by Jorge Lopez, the Mayor of Cold Bay. This site should be evaluated for closure after the soil stockpile generated during excavation is disposed of offsite. |
Joshua Barsis |
| 4/4/2014 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79586 1,000-Gallon Used Oil UST #1. |
Joshua Barsis |
| 9/4/2014 |
Update or Other Action |
On this day, the contaminated sites program (CPS) received a certificate of disposal for the UST soils; a total of 35.04 tons of contaminated soil were disposed of offsite. |
Joshua Barsis |
| 10/7/2014 |
Cleanup Complete Determination Issued |
Corrective Action Complete with ICs entered on this day. Petroleum contamination remains on-site in soil above ADEC cleanup levels; however ADEC has determined there is no unacceptable risk to human health or the environment as long as the contamination is properly managed. See cleanup letter for more information. |
Joshua Barsis |
| 10/7/2014 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Joshua Barsis |
| 10/7/2014 |
Update or Other Action |
Received signed Cleanup Complete-ICs Agreement Page |
Joshua Barsis |
| 11/1/2016 |
Institutional Control Compliance Review |
Staff changed from Joshua Barsis to IC Unit. IC compliance review conducted. Information added to Closure/IC Details. Reminder system set to follow-up in 2019. |
Kristin Thompson |
| 10/22/2019 |
Institutional Control Compliance Review |
An Institutional Controls reminder letter was e-mailed to the landowner on this date. |
Mossy Mead |
