| Action Date |
Action |
Description |
DEC Staff |
| 3/13/2018 |
Brownfields Award |
SFY 2019 DEC Brownfields Assessment and Cleanup Service awarded on this date. The Organized Village of Kasaan applied for DBAC funding to assess a property in town currently hindering redevelopment of the Discovery Campus. EPA State and Tribal Response Program (STRP) funds $38,306.00 awarded. |
Lisa Griswold |
| 5/29/2018 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 2/5/2019 |
Update or Other Action |
NTP issued to Ahtna Engineering Services, LLC to conduct DEC Brownfields Assessment and Cleanup Service at the Discovery Campus. |
Lisa Griswold |
| 3/19/2019 |
Document, Report, or Work plan Review - other |
ADEC received a Site Characterization Work Plan for the SFY 2019 DBAC work on March 14, 2019. The Work Plan describe the activities outlined in NTP 190000299 and Amendment 1 including: soil investigation utilizing test pits, and the installation of temporary monitoring wells to collect analytical samples from the area presumed to be contaminated with heating oil. ADEC submitted comments on the work plan and requested that a revised work plan be submitted by April 2, 2019. |
Lisa Griswold |
| 3/27/2019 |
Site Characterization Workplan Approved |
ADEC received the revised Site Characterization Work Plan for SFY 2019 DBAC work on March 25, 2019. The Work Plan described the activities outlined in NTP 190000299 and Amendment 1 including: soil investigation utilizing test pits, and the installation of temporary monitoring wells to collect analytical samples from the area presumed to be contaminated with heating oil. The revised work plan incorporated all comments listed in ADEC’s March 19, 2019 letter. This work plan is hereby approved. |
Lisa Griswold |
| 8/8/2019 |
Document, Report, or Work plan Review - other |
ADEC submitted comments to Ahtna regarding the site characterization report submitted on July 3, 2019. |
Lisa Griswold |
| 9/30/2019 |
Site Characterization Report Approved |
ADEC reviewed the revised site characterization report submitted on September 11, 2019 and has no further comments. The Report describes the activities outlined in the Site Characterization Work Plan ADEC approved on March 19, 2019 including digging 11 test pits and installing 3 temporary monitoring wells.Soil analytical results indicate that DRO is present up to 471 mg/kg TP-02 in the vicinity of the home heating oil tank and up to 1340 mg/kg in TP 10 in the vicinity of a potential dumping area, (considered a separate source area), but at a limited depth. 1,2,4 trimethylbenzene was detected in soil at 628 mg/kg, and naphthalene was detected up to 115 mg/kg in TP-02. Groundwater samples had one exceedence of ADEC cleanup levels with naphthalene present in TW-01 at 2.8 ug/L. TP-02 and TW-01 are in the same vicinity, and contamination is presumed to be from the same source area. |
Lisa Griswold |
| 3/18/2020 |
Brownfields Award |
Discovery Campus Kasaan awarded SFY2021 DEC Brownfields Assessment and Cleanup Services on this date. OVK had applied for DBAC funding for site cleanup |
Marc Thomas |
| 6/5/2020 |
Update or Other Action |
DEC drafted an Analysis of Brownfields Cleanup Alternatives. Published for public comment. |
Marc Thomas |
| 7/23/2020 |
Meeting or Teleconference Held |
Conversation with OVK Brownfield Coordinator regarding project status and planned cleanup activities. |
Marc Thomas |
| 8/3/2020 |
Update or Other Action |
Finalized Analysis of Brownfields Cleanup Approach and selected recommended cleanup alternative. Mailed OVK ABCA Close-Out Letter |
Marc Thomas |
| 10/23/2020 |
Document, Report, or Work plan Review - other |
DEC received a draft site characterization work plan for the SFY 2021 DBAC work from ECC on 10/14. DEC provided comments on 10/23/20. |
Marc Thomas |
| 10/29/2020 |
Cleanup Plan Approved |
DEC received and approved final site characterization work plan for cleanup work related to SFY 2021 DBAC funding. |
Marc Thomas |
| 1/8/2021 |
Update or Other Action |
Cleanup activities were conducted from 12 November 2020 through 20 November 2020 and from 4
January 2021 to 8 January 2021. The down-gradient area was excavated with photoionization detector (PID) readings, olfactory, and visual observations revealing no contamination. The excavation was dug to bedrock refusal at approximately seven feet below ground surface (bgs). Natural woody debris and man-made garbage was discovered during excavation activities.
The source of the contamination in the area of the former residence is believed to be from an historic aboveground storage tank (AST). Potholes were dug throughout the area at various depths to delineate the depth and extent of contaminated soil in the area. The AST area was excavated to bedrock, which was variable and found between 5 and 8 feet bgs. A final mobilization occurred in April 2021 to decommission the monitoring well.
One monitoring well was installed at bedrock within the AST area where PID readings were the highest.
end of the AST area. Groundwater samples were analyzed in November 2020 and found naphthalene concentrations (maximum 10.2 10.2µg/L) above DEC cleanup levels for Human Health based on 18 AAC 75.345 Table C. Groundwater Cleanup Levels. Other VOC compounds were detected
but were well below DEC cleanup levels. A second sampling event occurred in February 2021; samples collected were non-detect for naphthalene.
In total, 257 supersacks, 369.89 tons, were filled and shipped offsite to Waste Management’s Columbia Ridge Landfill in Arlington, Oregon.
|
Marc Thomas |
| 6/16/2021 |
Final Cleanup Report Reviewed |
ADEC received draft field report of cleanup activities on May 7th. ADEC reviewed and provided comments in a conference call on June 9th and in writing on June 15th. ECC addressed comments and provided final report on June 16th. |
Marc Thomas |
| 9/17/2021 |
Cleanup Complete Determination Issued |
A Cleanup Complete determination letter was issues on this date. |
Marc Thomas |
