Action Date |
Action |
Description |
DEC Staff |
6/25/1998 |
Cleanup Plan Approved |
Approval by the CSP was granted to transport approximately 10 cubic yards of petroleum hydrocarbon contaminated soils to Alaska Soil Recycling for thermal treatment.
Action added by Petrik. |
Eileen Olson |
3/17/1999 |
Site Characterization Report Approved |
Reviewed a copy of the Shannon & Wilson, Inc. "UST Closure Assessment, Nunaka Valley Elementary School" dated August 1998. Sent a letter this date requesting a site characterization work plan to further define the horizontal and vertical extent of contamination - collect soil confirmation samples beneath the former 5,000 gallon UST location and submitted for lab analysis, sampling beneath the former location of feed and return lines, and collection of a ground water sample from beneath the former tanks location.
Provide design and monitoring data to the CSP for the passive bioremediation treatment system installed during the June 22, 1998 field activities in the footprint of the 500 gallon UST without prior review or approval.
Action added by Petrik. |
David Pikul |
12/2/1999 |
Site Added to Database |
Two USTs were removed from the ground on 6/22/98 and petroleum contamination above cleanup levels was discovered. |
David Pikul |
3/7/2000 |
Site Ranked Using the AHRM |
Initial site ranking. |
David Pikul |
5/11/2004 |
Update or Other Action |
File number changed from CS68.09 to 2100.38.398. |
Sarah Cunningham |
5/31/2007 |
Update or Other Action |
Staff assignment changed from Pikul to Petrik. |
Shannon Oelkers |
5/19/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Bill Petrik |
7/16/2008 |
GIS Position Updated |
Used Google Maps in conjunction with Site Plan figure to update the latitude and longitude of the tanks site. Used the centroid of the two adjacent tanks as the target. |
Bill Petrik |
7/18/2008 |
Update or Other Action |
As of 7/18/08 after review, the contents of the file are the following;
-Shannon & Wilson, Inc. (S&W) letter report Request to Transport and Treat Hydrocarbon-Contaminated Soils from dated June 25, 1998. An approval letter was sent to S&W by Ms. Olson dated June 25, 1998.
- S&W Report titled UST Closure Assessment, Nunaka Valley Elementary School, 1905 Twining Drive, Anchorage, Alaska dated August 1998.
-A letter from Mr. Pikul dated March 17, 1999 responded to the S&W Report titled UST Closure Assessment, Nunaka Valley Elementary School, 1905 Twining Drive, Anchorage, Alaska dated August 1998. The letter requested:
-a copy of the consultant’s field notes recorded during the UST closure and the Chain of Custody forms for the laboratory submitted soil samples.
-a work plan developed that will characterize the vertical and horizontal extent of the petroleum hydrocarbon contamination at the site including confirmation sampling of those areas excavated during the tank removal operation.
-the site investigation should include the collection of a groundwater sample from beneath the area of contamination to characterize site groundwater.
-provide design and monitoring data to the CSP in order to evaluate the effectiveness of the system’s performance
-An R&M UST Activity Summary dated August 9, 2007, recommending No Further Action at the site.
ADEC requested any potential additional information from Edie Knapp of the ASD. |
Sydney Devine |
9/29/2008 |
Update or Other Action |
In the report dated August 1998 Shannon & Wilson (S&W) discusses the removal of one 500 gallon Diesel UST and one 5,000 gallon Bunker ‘C’ UST on June 22, 1998. Lab results reported DRO levels as high as 2,790 ppm (the only analyte above ADEC clean-up criteria). 10 cubic yards of contaminated soil was taken to Alaska Soils Recycling for thermal treatment on July 1, 1998. ADEC approved this transport & remediation June 25, 1998. S&W’s report also mentions a passive bioventing remediation system that was installed June 22, 1998 (see figure 4). (No approval from ADEC found).
The R & M Consultants, Inc. (R&M) letter dated August 9, 2007 refers to the passive bioventing system:
“The system included a perforated pipe bedded in gravel at a depth of about 13 feet below ground surface, which was attached to a riser, extending to a wind-powered turbine on the roof. In July 2007, the riser was still visible attached to the building wall, but the turbine was gone.”
The same R&M letter states that all housing in ¼ mile of the site was constructed after 1970 and is served by the public water system R&M says: “It is very unlikely that any active water wells are located within ¼ of the site.”
In the conclusions and recommendations section of the R&M letter it states: “Excavation of these (remaining) contaminated soils would not be possible, because the area is now under a building.” R&M recommends no further action.
|
Pam Clemens |
9/30/2008 |
Meeting or Teleconference Held |
Meeting with Edie Knapp with ASD, Aaron Banks with R&M and ADEC staff Bill O'Connell and Pam Clemens to discuss open ASD sites |
Pam Clemens |
10/22/2008 |
Update or Other Action |
Sent out letter to Edie Knapp with ASD concerning this site. File will be reviewed for possible closure. |
Pam Clemens |
3/4/2009 |
Update or Other Action |
Sent email to Edie Knapp and Aaron Banks requesting soil gas evaluation prior to decommissioning the passive bioventing system at ASD Nunaka Valley Elementary. |
Pam Clemens |
3/27/2009 |
Document, Report, or Work plan Review - other |
Received letter report from R&M Consultants, Inc. on the VOC screening done March 26, 2009 at ASD Nunaka Valley Elementary School. No VOCs were detected. When the closure letter is drafted for this site a condition of closure will be the decommissioning of the remaining stand pipe for the passive bioventing system. The groundwater has not been investigated as per the 1999 request from David Pikul. |
Pam Clemens |
5/19/2010 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 73976 name: 500 Gal. Diesel UST & 5,000 Gal. Bunker "C" UST |
Pam Clemens |
5/21/2010 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 73976 500 Gal. Diesel UST & 5,000 Gal. Bunker "C" UST. |
Pam Clemens |
6/1/2010 |
Document, Report, or Work plan Review - other |
Reviewed and approved final report of the standpipe decommissioning completed at Nunaka Valley Elementary School May 27, 2010. |
Pam Clemens |
6/3/2010 |
Cleanup Complete Determination Issued |
Based on 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 this site will be closed with institutional controls. |
Pam Clemens |
6/3/2010 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Pam Clemens |
6/17/2010 |
Update or Other Action |
Received the signed Attachment A: Cleanup complete-ICs Agreement and Signature Page. See attachments. |
Pam Clemens |
2/16/2012 |
Update or Other Action |
Staff changed from Pam Clemens to IC Unit. |
Kristin Thompson |
11/9/2012 |
Institutional Control Compliance Review |
IC review conducted. Reminder system set-up to contact responsible party in 2015. |
Kristin Thompson |
6/22/2015 |
Institutional Control Update |
An IC reminder letter was issued to the responsible party on this date. |
Kristin Thompson |
2/6/2023 |
Institutional Control Compliance Review |
IC compliance review conducted on this date and a reminder letter was issued. The next compliance review will be in 2028. |
Jennifer McGrath |