| Action Date |
Action |
Description |
DEC Staff |
| 5/27/2002 |
Update or Other Action |
Date of Final Village of Tununak Site Reconnaissance Project Report by Oasis which led to this location being added to the CS list.
The three samples that contained exceedances of Method 2 migration to groundwater were collected from stained area and within containment area. Containment area is not lined. |
Keather McLoone |
| 6/12/2008 |
Site Added to Database |
Site added to the database. |
Mitzi Read |
| 6/16/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Keather McLoone |
| 9/5/2008 |
Update or Other Action |
Spoke with Pat Desmet Regulatory Compliance Officer of the Lower Kuskokwim School District's Plant Facilities Department regarding current status of tank farm. When AVEC consolidated the village's tank farms, an intermediary (~4,000 gallon tank) was placed in or near the old tank farm. The old tank farm is still there but no longer used. |
Keather McLoone |
| 12/12/2008 |
Update or Other Action |
Received copy of VSW trip report for mid-November trip to Tununak regarding upcoming VSW washeteria project. Village is on a boil water notice for water obtained from washeteria which could explain why there have been reports of people choosing to use the school's well water. |
Keather McLoone |
| 1/5/2009 |
Update or Other Action |
DEC received a revised proposal under term contract to do additional site characterization to include sampling of drinking water well pre- and post-treatment. The objectives are to 1)Characterize the nature and extent of soil and groundwater contamination at the site; 2)Identify any potential threat to human health, safety, and welfare, and to the environment; and, 3) Recommend potential future remediation activities. |
Keather McLoone |
| 1/8/2009 |
Update or Other Action |
Received VOC results from the testing of the nearby drinking water well used by the community belonging to the Paul T. Albert Memorial School. This well is listed in the drinking water program as the LKSD Tununak High School well. No VOC exceedances of drinking water criteria. |
Keather McLoone |
| 1/12/2009 |
Update or Other Action |
Email from Gary Hanson of the LKSD on this date states "LKSD agrees to provide permission for access to the BIA School Site in Tununak. Please contact Brett Stirling the Site Administrator @ 652-6827 to arrange lodging, and access to the work area." This information was forwarded to Oasis.
|
Keather McLoone |
| 2/13/2009 |
Update or Other Action |
NTP issued to Oasis to proceed with workplan development, fieldwork, and reporting. |
Keather McLoone |
| 3/27/2009 |
Update or Other Action |
Received Draft SITE CHARACTERIZATION WORK PLAN, TUNUNAK BIA SCHOOL TANK FARM. This work involves test pitting/trenching with a backhoe, screening the soil using a PID, and collecting lab samples in order to determine the presence and extent of contamination using past information collect in the 2001 Site Reconn. A pre-treatment and post-treatment sample from the nearby community well is also planned. DEC submitted comments on the draft workplan via email on 4/3/09. |
Keather McLoone |
| 4/8/2009 |
Site Characterization Workplan Approved |
Revised SITE CHARACTERIZATION WORK PLAN, TUNUNAK BIA SCHOOL TANK FARM received on 4/6/09 with all comments incorporated and approval sent to Oasis via email on this action date. This field work is currently scheduled to be completed in FY09. As of 4/24/09 work was postponed until early June due to the large amount of snow on the ground in late April. |
Keather McLoone |
| 7/21/2009 |
Document, Report, or Work plan Review - other |
Review of Draft Site Characterization report submitted 7/17/09. Laboratory review checklist received and reviewed 7/24/09. |
Keather McLoone |
| 8/11/2009 |
Update or Other Action |
Report Comment Letter sent to Oasis. |
Keather McLoone |
| 9/22/2009 |
Document, Report, or Work plan Review - other |
Receipt on this date of Final Site Characterization Report and reviewed for incorporation of comments. The work plan called for using a backhoe to excavate test pits around the tank farm containment. When the OASIS crew arrived in Tununak, they found that the containment was surrounded on two sides by low-hanging overhead power lines. A boardwalk blocked access to a third side of the containment. The crew was able to have one test pit excavated with the backhoe, on the northwestern side of the containment area. The backhoe encountered permafrost at 6.5 feet bgs in this test pit. The crew hand-augured an additional eleven pits around and inside the tank farm containment but were unable to augur below a maximum of three feet bgs,
either due to large rocks or frozen soil. The majority of the hand-augured pits were
between one- and two-feet deep.
The soil results indicated that petroleum hydrocarbon impacts were present on the
southwestern side of the tank farm containment, in an area where a six-foot diameter
stain had been noted in 2001. Five test pits had been augured adjacent to this wall of
the containment and four of the samples exceeded the ADEC DRO soil cleanup level of
250 milligrams per kilogram (mg/kg), ranging up to 7,030 mg/kg. One sample also
exceeded the ADEC RRO soil cleanup level of 11,000 mg/kg, with a result of 21,300
mg/kg. The remaining samples from the eleven pits did not have analyte concentrations
above the ADEC soil cleanup levels.
GRO and BTEX soil results should be considered rejected due to sample collection procedures which involved storage of soil samples in Ziploc bags until later sample processing into methanol preserved jars. PID results are also biased low due to storage in Ziploc bags for up to several hours before taking a headspace reading.
The OASIS crew was not able to assess the vertical extent of the contamination in the
four test pits noted above because the backhoe was not able to access this side of the
containment. They also did not completely assess the horizontal extent because of time
constraints and heavy piping present to the southwest of the impacted pits. In order to
fully assess the hydrocarbon impacts an alternate form of subsurface sampling will be
needed such as a smaller backhoe that can fit underneath the power lines or a small drill rig, such as a Geoprobe®. The project work should be scheduled for late in the summer or early fall when the ground has had a chance to thaw.
The LKSD water supply well is located approximately 30 feet north of the tank farm
containment. The Tununak River is to the south of the tank farm and Tununak Bay is
northwest of the tank farm, so presumably the well is cross-gradient or up-gradient of the
tank farm. The pre-treatment and post-treatment samples from the well were collected
from the water treatment building and were submitted for VOC analysis. The pretreatment
sample was also submitted for DRO analysis. DRO was detected in the pretreatment
sample at 0.159 milligrams per liter (mg/L), well below the 1.5 mg/L ADEC
Table C groundwater cleanup level. Five chlorinated compounds were detected in both
the pre-treatment and post-treatment samples at very low concentrations, again well
below the ADEC Table C groundwater cleanup levels. The chlorinated compounds are
not associated with fuels and source of these compounds is unknown. |
Keather McLoone |
| 6/17/2010 |
Update or Other Action |
Date that CSP became aware of a more recent release at this actively used facility. Email communication, including photos, from PERP. Spills database says that the spill was reported by LKSD ON 6/11/2010 as 22 gallons. Bob Carlson stated that he will be checking this site out this summer. |
Keather McLoone |
| 3/14/2012 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75709 ASTs. |
Keather McLoone |
| 10/13/2013 |
Update or Other Action |
The drinking water well is within 30 feet of the BIA tank farm. On October 14, 2013 a water sample was collected from the drinking water well. One DRO sample and one duplicate was collected from the pretreated faucet. One VOC sample was collected from the pretreated faucet and one VOC and one duplicated was collected from the post treatment faucet. All samples came back below clean up levels |
Katrina Chambon |
| 1/7/2014 |
Meeting or Teleconference Held |
Meeting with consultant and RP to discuss the Environmental Work Plan for the Tununak K-12 School Major Maintenance project. |
Katrina Chambon |
| 3/3/2014 |
Site Characterization Workplan Approved |
The work plan proposes to excavate up to 200 cubic yards of petroleum impacted soil, construct and maintain a landfarm, and collect field screening and laboratory analytical soil samples.
The CSP programs approves the work plan with the following conditions.
1.The work plan shall not be modified without prior approval from the CSP.
2.The Lower Kuskokwim School District shall notify the CSP project manager who the environmental contractor is within one month of the contract being awarded.
The CSP suggests that additional laboratory confirmation soil samples be collected from locations midway between the excavation and the clean test pits if the petroleum contaminated soil extends 30 lateral feet or more (Section 4.4.1.2). This analytical data would assist CSP in making a decision as to whether the site could be closed or whether additional work is required.
|
Katrina Chambon |
| 6/22/2017 |
Potentially Responsible Party/State Interest Letter |
State interest letter sent to Lower Kuskokwim School district which inventoried several sites for which the school district is a responsible party. |
Chelsy Passmore |
| 8/29/2019 |
Update or Other Action |
The ADEC reviewed data that was received from the BIA, regarding work completed in 2015. No report has been received at this time. Data indicates that 75 analytical samples were collected from unknown depths from 6 areas across the site. Samples contained DRO, benzene and ethylbenzene above migration to groundwater cleanup levels. No samples contained concentrations above human health cleanup levels. There is evidence that at least 4 areas were excavated as noted by samples labeled "excavation", and that soil was stockpiled on site and sampled, however it is unknown if the stockpile remains on site. |
Chelsy Passmore |
| 8/29/2019 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75709 ASTs. |
Chelsy Passmore |
| 12/31/2020 |
Update or Other Action |
Sent LKSD an inventory letter of all of their sites (including Chefornak) and the ADEC ranking. |
Chelsy Passmore |
