Site Report: MOA - AWWU - Maintenance Facility (1997 Tank Removal)
| Site Name: | MOA - AWWU - Maintenance Facility (1997 Tank Removal) |
|---|---|
| Address: | 325 East 94th Court, Anchorage, AK 99515 |
| File Number: | 2100.26.569 |
| Hazard ID: | 25575 |
| Status: | Cleanup Complete - Institutional Controls |
| Staff: | IC Unit, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 61.136185 |
| Longitude: | -149.876910 |
| Horizontal Datum: | WGS84 |
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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.
Problems/Comments
On October 29, 1997 two 10,000-gallon unleaded gasoline underground storage tanks (USTs) and one 10,000-gallon diesel UST were removed. The dispensing island used by the former USTs was not removed and was connected to the new aboveground storage tank system. Contaminated soil at one location with DRO at 390 mg/kg remained in the excavation. Approximately 20 cubic yards of contaminated soil were removed and thermally treated. A release investigation was conducted in 1998 including the installation of four monitoring wells which were monitored quarterly in 1999. The 1998 release invesigation documented that the dispenser island and below ground piping areas meet cleanup levels. Soil samples collected in 1998 near the sample location that had 390 mg/kg DRO in 1997 meet cleanup levels. Groundwater met cleanup levels throughout 1999.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 10/27/2010 | Site Added to Database | A new site has been added to the database | Mitzi Read |
| 10/27/2010 | Leaking Underground Storage Tank Release Confirmed - Petroleum | LUST site created in CSP database for source area Two 10,000-Gal Unleaded Gas & One 10,000-Gal Diesel UST, 78972 | Mitzi Read |
| 10/27/2010 | Leaking Underground Storage Tank Cleanup Initiated - Petroleum | 3/2/11 - Administrative action addition | Evonne Reese |
| 11/15/2010 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 78972 name: Two 10,000-Gal Unleaded Gas & One 10,000-Gal Diesel UST | Pam Clemens |
| 11/16/2010 | Document, Report, or Work plan Review - other | Reviewed all six reports in file for the Exposure Tracking Model and to move toward closure. | Pam Clemens |
| 11/17/2010 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 78972 Two 10,000-Gal Unleaded Gas & One 10,000-Gal Diesel UST. | Pam Clemens |
| 12/20/2010 | Cleanup Complete Determination Issued | Based on information provided to date and the administrative record, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment. Therefore this site will be issued a Corrective Action Complete with Institutional Controls (ICs) determination. See database entries under Closure/IC Details for specific requirements. | Pam Clemens |
| 12/20/2010 | Institutional Control Record Established | Institutional Controls established and entered into the database. | Pam Clemens |
| 12/27/2010 | Update or Other Action | Received and filed, this date, the signed Attachment A: Corrective Action Complete-ICs Agreement and Signature Page. | Pam Clemens |
| 7/14/2011 | Document, Report, or Work plan Review - other | Workplan approved to decommission the four monitoring wells | Bill O'Connell |
| 9/6/2011 | Document, Report, or Work plan Review - other | Reviewed report detailing the decommissioning of the four remaining monitoring wells. | Bill O'Connell |
| 2/9/2012 | Institutional Control Compliance Review | IC review conducted, staff changed from O'Connell to IC Unit, periodic follow up added to the IC Requirements, the groundwater well decommissioning IC requirement was removed since the project has been completed, and reminder system updated for five years from the closure date. | Evonne Reese |
| 2/24/2016 | Institutional Control Update | IC reminder letter issued to the responsible party on this date. | Nathan Maxwell |
| 6/20/2018 | Institutional Control Compliance Review | IC compliance review conducted. Closure/IC Details updated. Reminder system already set for next follow-up in 2021. | Kristin Thompson |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation | Soil | In 1997 the remaining DRO level was 390 mg/kg in the sidewall of the excavation. In 1998 the area was sampled again and DRO was below the most stringent migration to groundwater cleanup level. This area is covered with clean fill. |
| DRO | < Table C | Groundwater | DRO was at 1.5 mg/L during the initial investigation and below that level or not detected in subsequent sampling events. |
Control Type
| Type | Details |
|---|---|
| Signed CS Determination |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. | Standard condition. |
| Groundwater Use Restrictions | Future installation of groundwater monitoring wells will require approval from ADEC. |
| Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70) | Standard condition. |
| Other | MOA shall report to ADEC every five years to document land use, or report as soon as they become aware of any changes in land ownership and/or use. |
| Hazard ID | Site Name | File Number |
|---|---|---|
| 26995 | MOA AWWU Maintenance and Operations Facility Diesel AST Overfill | 2100.38.574 |
| 24744 | MOA AWWU Operations Facility 1999 Used Oil Tank removal | 2100.26.331 |