| Action Date |
Action |
Description |
DEC Staff |
| 4/7/2014 |
Underground Storage Tank Site Characterization or Assessment |
On April 7, 2014 seven soil borings were sampled in the area of the former UST system which documented DRO (up to 2,480 mg/kg) and benzene (up to 0.0559 mg/kg) contamination at two of the boring locations. |
Robert Weimer |
| 6/27/2014 |
Site Characterization Workplan Approved |
ADEC conditionally approves the June 25, 2014 assessment work plan that proposes to excavate the soil in the former tanks/dispenser area, segregate the excavated soil based on field readings and observations, collect soil samples from all excavated soil to characterize it for treatment/disposal/reuse, and collect confirmation soil samples from the excavation to verify that the contamination was successfully removed. This plan is approved with the following clarifications:
1. PAH analysis is only requested on 10% of the analytical sample locations, with a minimum of one from each stockpile, and a minimum of one from the excavation after the excavation work has been completed from the areas of most likely contamination.
2. The location of the former dispenser needs to be documented to include the excavated area. At least one of the excavation samples is to be collected from below the former dispenser location.
3. The excavated soil is placed on a bermed liner, with a secured cover.
4. Due to the shallow groundwater documented at 6 to 8 feet below ground surface at a nearby contaminated site (8223 Hartzell Road) you should plan on encountering groundwater during the excavation activities. Any water removed from the excavation needs to be containerized/treated/dispose of in accordance with an DEC approved plan.
5. If groundwater is not encountered as part of the excavation activities, then a test pit will need to be dug 5 feet deeper than the base of the excavation to assess whether groundwater is within 5 feet of the base of the excavation.
6. If contamination extends to near the groundwater, then long term monitoring wells will be required in the future to assess the site for groundwater contamination. The monitoring wells would need to be installed, and developed in accordance with the DEC September 2013 monitoring well guidance.
7. The stockpile, excavation sidewall, and excavation base field screening and analytical samples, and QA/QC samples are to be collected/frequency in accordance with the DEC May 2010 Draft Field Sampling Guidance.
8. Complete copies of field notes are to be provided with the report.
9. ADEC be notified prior to conducting the work. |
Robert Weimer |
| 7/19/2014 |
Document, Report, or Work plan Review - other |
Between July 12-19, 2014 250 cubic yards of contaminated soil was excavated in the area of the former UST system. The excavation extended to 14 feet below ground surface and groundwater seeps were observed in the sidewalls of the excavation. Because groundwater was encountered long-term monitoring wells are required to assess the site for potential groundwater contamination and seasonal groundwater flow direction. |
Robert Weimer |
| 9/3/2014 |
Offsite Soil or Groundwater Disposal Approved |
The 250 cubic yards of excavated contaminated soil were approved to be transported for off property thermal treatment at ASR, but still remain on property. |
Robert Weimer |
| 9/5/2014 |
Potentially Responsible Party/State Interest Letter |
Potentially responsible party notification sent to 8123 LLC. |
Robert Weimer |
| 9/10/2014 |
Site Added to Database |
A new site has been added to the database. Two 2,000-gallon diesel underground storage tanks (#1 & #2), their associated piping, and dispensers (UST system) were removed in 1990 without any assessment sampling. |
Mitzi Read |
| 9/10/2014 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST site created in CSP database for source area Two 2,000-Gallon Diesel USTs 1 & 2, 79657 |
Mitzi Read |
| 9/23/2014 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79657 name: Two 2,000-Gallon Diesel USTs 1 & 2 |
Robert Weimer |
| 10/3/2014 |
Document, Report, or Work plan Review - other |
ADEC review of September 22, 2014 corrective action work plan. Discussed with property owners consultant, he will provide a revised work plan for approval. He noted that groundwater in the excavation is currently about 5 feet below ground surface and they have taken an excavation water sample for the AWWU permit that had about 1 mg/l DRO. |
Robert Weimer |
| 11/20/2014 |
Offsite Soil or Groundwater Disposal Approved |
180 cubic yards of excavated contaminated soil is approved to be transported for off property thermal treatment at ASR. The other stockpiled soil is not currently approved for reuse, it will need a review the sample data and field notes for those soils. |
Robert Weimer |
| 12/1/2014 |
Document, Report, or Work plan Review - other |
Based on the exaction sampling data provided for the November 14-21, 2014 site work, ADEC has no objection to backfilling the excavation. Still need a work plan for the installation of long-term monitoring wells to assess for groundwater contamination at the site. All excavation soil samples meet default cleanup levels. |
Robert Weimer |
| 12/3/2014 |
Update or Other Action |
Based on the information provided ADEC has no objection to using as backfill the 90 cubic yard "clean" stockpile. |
Robert Weimer |
| 12/31/2014 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
Administrative action addition for grant reporting purposes.
|
Evonne Reese |
| 1/5/2015 |
Document, Report, or Work plan Review - other |
ADEC provides comments on the proposed December 17, 2014 Groundwater Characterization and Monitoring Work Plan. |
Robert Weimer |
| 1/6/2015 |
Site Characterization Workplan Approved |
ADEC approves the revised January 5, 2015 Groundwater Characterization and Monitoring Work Plan. The work plan proposes to install 3 monitoring wells near the excavation. Based on the results/seasonal groundwater flow direction additional monitoring wells may be required to assess the groundwater at this site. |
Robert Weimer |
| 1/30/2015 |
Site Visit |
Site visit to observe installation of three monitoring wells and one piezometer. |
Robert Weimer |
| 2/18/2015 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79657 Two 2,000-Gallon Diesel USTs 1 & 2. |
Robert Weimer |
| 3/3/2015 |
Document, Report, or Work plan Review - other |
ADEC received Groundwater Characterization and Sampling Report. Three Groundwater Monitoring wells and a piezometer were installed on 1/30/15, developed on 1/31/15 and sampled on 2/1/15. Results indicated no contaminants above clean up levels. |
Lisa Griswold |
| 5/13/2015 |
Update or Other Action |
ADEC approves suspending GRO sampling of the groundwater. They plan to analyze for BTEX and DRO. |
Robert Weimer |
| 7/29/2015 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79657 Two 2,000-Gallon Diesel USTs 1 & 2. |
Robert Weimer |
| 7/30/2015 |
Document, Report, or Work plan Review - other |
ADEC received the Spring 2015 Groundwater Monitoring Report. Sampling results indicate groundwater elevation and gradient increased and DRO present above ADEC cleanup levels (1.76). |
Lisa Griswold |
| 8/19/2015 |
Site Visit |
Site visit to observe ground water monitoring event. |
Lisa Griswold |
| 10/12/2015 |
Document, Report, or Work plan Review - other |
ADEC received the Summer 2015 Groundwater Monitoring Report. Sampling indicates that groundwater elevation has increased since the May 19 sampling event, while the gradient has decreased. Benzene in MW-1 is above ADEC clean up levels (.0059mg/L); while the DRO previously found in MW-2 has decreased to below clean up levels. Other contaminants were none detect. |
Lisa Griswold |
| 1/4/2016 |
Document, Report, or Work plan Review - other |
Fall 2015 Groundwater Monitoring Report reviewed on this date. Sampling conducted on November 24, 2015 indicates that the groundwater elevation has decreased while the gradient has increased. Groundwater flow direction was to the Northwest. All samples had contaminants at non-detectable levels, or below ADEC Table C cleanup levels. ADEC concurred with consultant that groundwater monitoring at this site is no longer needed. ADEC requested a well decommissioning work plan, and will begin evaluating site for potential closure. |
Lisa Griswold |
| 1/26/2016 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79657 Two 2,000-Gallon Diesel USTs 1 & 2. |
Lisa Griswold |
| 2/19/2016 |
Document, Report, or Work plan Review - other |
Groundwater monitoring well decommissioning work plan reviewed and approved on this date. The work plan details the removal of the three groundwater monitoring wells, and one piezometer. The wells are to be removed, backfilled with sand or gravel and topped with cold-patch asphalt to match surface grade. |
Lisa Griswold |
| 3/22/2016 |
Update or Other Action |
Groundwater Monitoring Well Decommissioning report was received March 14, 2016 and reviewed on this date. Three groundwater monitoring wells, and one piezometer were removed on March 10, 2016 in accordance with the ADEC Monitoring Well Guidance and the ADEC approved Groundwater Monitoring Well Decommissioning Work Plan. The three wells were pulled, backfilled with bentonite chips to approximately 2 feet below ground surface, then topped with 2 feet of pea gravel before being capped with cold patch asphalt. The piezometer broke twice while attempting removal, and was backfilled with sand for the screened interval, filled with bentonite chips, topped with pea gravel and capped with cold patch asphalt. |
Lisa Griswold |
| 3/22/2016 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79657 Two 2,000-Gallon Diesel USTs 1 & 2. |
Lisa Griswold |
| 3/25/2016 |
Cleanup Complete Determination Issued |
The Alaska Department of Environmental Conservation (ADEC) has reviewed the environmental records for the referenced site. This decision memorializes the site history, cleanup actions, and standard conditions for long-term site management. No further remedial action is required. |
Lisa Griswold |
