| Action Date |
Action |
Description |
DEC Staff |
| 10/11/2011 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the Chinak UST Removal Post Project Closure Report Chinak, Alaska submitted by Satori Group dated October 2011. In September 2011, petroleum contamination was encountered during sight assessment activities to remove an unregistered regulated 500-gallon diesel underground storage tank (UST). 15 cubic yards of contaminated soil were removed and stockpiled on site. The excavation dimensions were 33 x 19 x 6.5 feet. The bottom of the 500-gallon UST was estimated at 6 feet bgs. A confirmation sample was not collected at this depth due to 2 feet of standing water in the base of the excavation and sluffing soil potential. Three soil samples collected from the excavation at depths of 3.5 to 5.5 feet contained DRO up to 734 mg/kg. Two soil samples collected below the piping at 1.5 feet bgs contained DRO up to 13,000 mg/kg, benzene up to 0.91 mg/kg, and toluene up to 8.63 mg/kg. The contaminated stockpile was placed on a liner and covered on site and the excavation was fenced off and left open until additional work is completed. The tank was removed from the site.
Additional site assessment activities were conducted to evaluate a registered regulated 12,000-gallon diesel UST (Tank #1). This tank was converted from a regulated UST containing generator fuel to an unregulated underground heating oil tank (HOT) and remains on site. The soil samples contained detectable levels of petroleum constituents, but no contamination above ADEC cleanup levels was noted during the site assessment activities for the 12,000-gallon UST. Four soil borings were advanced to a depth of 12 feet bgs and sampled at that depth. |
Grant Lidren |
| 10/14/2011 |
Meeting or Teleconference Held |
Staff held a teleconference with the Satori Group and the Kodiak Island Borough to discuss the next course of action for the Chiniak School site. Proposed additional work at the site includes further excavation of contaminated material and collection of confirmation samples. The handling/treatment of contaminated soil and dewatering of the excavation will be done in accordance with a treatment plan. |
Grant Lidren |
| 10/17/2011 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 10/17/2011 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST site created in CSP database for source area 500-Gal Unregistered Regulated Diesel UST, 79191 |
Mitzi Read |
| 10/19/2011 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79191 name: 500-Gal Unregistered Regulated Diesel UST |
Mitzi Read |
| 12/22/2011 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
Adminstrative action addition for grant reporting purposes.
|
Evonne Reese |
| 12/11/2012 |
Update or Other Action |
On this date, ADEC received the Chiniak School Sampling Report submitted by Travis Peterson and dated November 2012. Six soil samples collected from the 2009 Caretaker’s House stockpile managed by PERP contained DRO up to 265 mg/kg. One soil sample collected from the 2011 500-gal UST 15 cy stockpile contained DRO at 1,230 mg/kg. Prior to additional excavation at the 500-gallon former UST location, rainwater was removed into 150-gallon tanks. Sheen was removed with absorbent pads. Water free of sheen and odor was discharged south of the landfarm cells. 40 cubic yards of contaminated soil was then removed. Excavation of contaminated soil was limited by the building foundation to the north. Two soil samples collected from the bottom of the excavation at 4.0 to 4.5 feet bgs contained DRO up to 1,500 mg/kg. Two soil samples collected along the building foundation at 3.25 and 3.50 feet bgs contained DRO up to 1,500 mg/kg. The contaminated soil was put in a lined covered stockpile on site. Two soil samples collected from this pile contained DRO up to 1,280 mg/kg. An additional lined/ covered stockpile was ultimately required; no soil samples were collected from this pile. The excavation was then brought to grade with clean fill. |
Grant Lidren |
| 12/27/2012 |
Document, Report, or Work plan Review - other |
On this date, ADEC approved plans to land farm the Generator Building stockpiled soils at the onsite landf arm. The soils will be tilled 8 to 12 times this summer by Golden AK Excavating and performance samples will be collected. |
Grant Lidren |
| 4/24/2013 |
Update or Other Action |
Soil will be spread at the existing landfarm on this date |
Grant Lidren |
| 10/3/2013 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the Chiniak School Kodiak Island Borough Confirmation Sampling Report submitted by Travis/Peterson dated September 2013. In May 2013, 40 cy of stockpiled soils were dropped onto the historic landfarm in a 40 by 40 foot area with an average thickness of 7 inches deep. Fertilizer was mixed in the soil to promote biodegradation. In September 2013, three soil samples collected 6 inches into the pile contained DRO up to 276 mg/kg. |
Grant Lidren |
| 11/29/2013 |
Update or Other Action |
On this date, ADEC received a signed CC-Ic agreement page from the Chiniak School |
Grant Lidren |
| 11/29/2013 |
Cleanup Complete Determination Issued |
The Alaska Department of Environmental Conservation (ADEC) has reviewed the environmental records for the Chiniak School. Based off the site history, cleanup actions, and specific conditions required to effectively manage remaining contamination; no further remedial action will be required as long as the site is in compliance with institutional controls. |
Grant Lidren |
| 10/7/2014 |
Institutional Control Compliance Review |
IC compliance review conducted and staff changed from Grant Lidren to IC Unit. Reminder system set to follow-up with responsible party in 2018. |
Kristin Thompson |
| 10/7/2015 |
Update or Other Action |
In July 2014 the 12,000-gallon unregulated underground heating oil tank, former UST #1 (converted to a heating oil tank in September 2011 through a formal change in service), was cleaned and decommissioned in place. All field screening PID readings were below 20ppm and confirmation sampling confirmed no contaminants were present above DEC cleanup levels.
During the 2014 site assessment activities a soil sample was collected from beneath the piping at the base of the "GenSet" building confirmed the presence of diesel range organics at 10,400 mg/kg. This was believed to be remaining contamination from the removal of UST #2 when an pipe was accidentally ruptured. This release is part of the remaining contamination on site that is being managed with institutional controls. |
Mitzi Read |
| 6/15/2018 |
Institutional Control Compliance Review |
IC compliance review conducted. Closure/IC Details updated. ICs reminder letter issued. Reminder system set for follow-ups to occur every five years. |
Kristin Thompson |
