| Action Date |
Action |
Description |
DEC Staff |
| 10/22/1999 |
Site Added to Database |
|
Former Staff |
| 10/22/1999 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77878 (Added by System) As excavation to remove the USTs began contaminated soil was encountered at about five feet below ground surface extending to ten feet below ground surface where groundwater was encountered. Analyticals detected DRO @ 15,000 mg/kg and GRO @ 710 mg/kg; benzene was not detected. Data indicate that soil contamination is in a weathered condition and resulted from a historical release unrelated to the current UST closure by removal. |
Former Staff |
| 10/2/2001 |
Update or Other Action |
Changed Project Manager from Paul Horwath to Bill Janes |
Cynthia Pring-Ham |
| 3/20/2002 |
Update or Other Action |
Project Manager changed from Janes to Wanstall. |
Bruce Wanstall |
| 5/8/2002 |
Update or Other Action |
Notice of Intent to Cost Recover sent to CBJ |
Bruce Wanstall |
| 3/27/2003 |
Update or Other Action |
File review for site status. Request for additional Site Assessment sent to RP by email. |
Bruce Wanstall |
| 9/3/2003 |
Update or Other Action |
Letter requesting Release Investigation and Corrective Action Plan sent to Responsible Party. |
Bruce Wanstall |
| 6/2/2004 |
Leaking Underground Storage Tank Corrective Action Underway |
Corrective Action Plan approved by staff. |
Bruce Wanstall |
| 6/25/2004 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
CBJ contracted to excavate, remove and remediate petroleum-contaminated soil left in place following closure of USTs in 1999. After six feet of overburden was removed and segregated for backfill, soil removal widened in depth and breadth from the previous excavation limits. 345 tons of material was transported for off-site remediation and limits of contamination were not found. |
Bruce Wanstall |
| 9/15/2004 |
Release Investigation |
Site Assessment Report of additional subsurface soil removal from the former UST site; contamination screening began six feet below ground surface (BGS) and continued down to groundwater at about 12 feet BGS. 345 tons of contaminated material were excavated, transported offsite, and remediated. |
Bruce Wanstall |
| 12/20/2004 |
Leaking Underground Storage Tank Corrective Action Underway |
A total 445 tons of contaminated soil has been removed; additional contaminated material was removed from the subsurface soil layer extending outward to the east and south from the former fuel transfer building site. The limits of oily soil were found except beneath the water main along the west side of the excavation following it south where soil removal would threaten the integrity of the structure. Concentrations of DRO along the utility corridor ranged from 241 mg/kg to 3,670 mg/kg and extended from 11 feet to15 feet below ground surface (BGS). |
Bruce Wanstall |
| 3/10/2006 |
Update or Other Action |
Report review to determine the nature and quantity of contaminated material underlying the water main utility corridor on the west perimeter of the UST excavation pit for conditional closure consideration. |
Bruce Wanstall |
| 7/14/2006 |
Document, Report, or Work plan Review - other |
Corrective Action Report Approval letter with request for additional site monitoring drafted and sent to the RP. |
Bruce Wanstall |
| 8/20/2007 |
Update or Other Action |
Develop a priority site list for CBJ Engineering and request ground water investigation at each of six leaking underground storage tank sites |
Bruce Wanstall |
| 10/11/2007 |
Exposure Tracking Model Ranking |
Review reports for status evaluation using the environmental tracking module for the UST fuel subsurface release on property located adjacent to the Juneau International Airport. |
Bruce Wanstall |
| 1/27/2009 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77878 Underground Storage Tanks. The complete human exposure pathways to surface and subsurface petroleum contamination at this site include dermal contact and ingestion of soil particles, inhalation of ambient air. The outdoor inhalation and dermal contact/ingestion exposure risk is not unacceptable as the residual soil remains only below ground surface. The migration to ground and surface water exposure risk is not unacceptable because neither groundwater and nor surface water are potable near this marine estuary. Potable water at the facility and in the area is supplied by the City and Borough of Juneau. The close hydrological connection between groundwater and Jordan Creek is a complete pathway to surface water and ecological receptors. Based on Site Assessment data, the migration of residual petroleum contamination from the site does not pose an unacceptable risk of exceeding 18 AAC 70 Water Quality standards.
|
Bruce Wanstall |
| 1/28/2009 |
Site Characterization Report Approved |
The concentrations of hydrocarbon fractions (GRO & DRO) and volatile petroleum compounds (BTEX) were each below the applicable migration to groundwater soil cleanup levels with the exception of one sample from the north side of the UST excavation. CL08 with DRO at 5,580 mg/kg represents a small pocket of contamination under the paved area just inside the JIA gated entrance.
Residual soil under the utility line was characterized by analysis of three soil samples for GRO, DRO and BTEX compounds. Concentrations of each of the BTEX compounds was below Table B1 migration to ground water cleanup levels, indicating low potential for contamination to migrate to nearby surface water. A soil sample collected in 1999 at the buried water main had concentrations of DRO at 3,800 mg/kg and GRO at 540 mg/kg. Where additional removal occurred in 2004 further south along the buried water main, two more soil samples were collected for analysis. Soil sample CL01 had DRO at 241 mg/kg and GRO at 41 mg/kg; sample CL02 had DRO at 605 mg/kg and GRO at 39 mg/kg. The residual contamination smear zone lens in the utility corridor appears to be a meter wide and thick over a length of 20 meters.
See attached map documents to view the orientation of this residual subsurface soil contamination. |
Bruce Wanstall |
| 1/29/2009 |
Record of Decision |
The cleanup actions to date have served to excavate and adequately remove contaminated soil from the site. Based on the information available, ADEC has determined no further assessment or cleanup action is required. Although a Corrective Action Complete determination has been granted, ADEC approval is required for off-site soil or groundwater disposal in accordance with 18 AAC 78.600(h). It should be noted that movement or use of potentially contaminated soil or groundwater in a manner that results in a violation of 18 AAC 70 water quality standards is unlawful. |
Bruce Wanstall |
| 1/29/2009 |
Cleanup Complete Determination Issued |
ADEC reviewed site assessment data on the Glacier Valley Fire Station facility located at 1700 Crest Drive in Juneau. Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and no further remedial action will be required. |
Bruce Wanstall |
| 10/31/2014 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77878 Underground Storage Tanks. |
Bruce Wanstall |
