| Action Date |
Action |
Description |
DEC Staff |
| 5/30/1994 |
Update or Other Action |
(Old R:Base Action Code = RARR - Remedial Action Report Review (CS)). |
Ray Dronenburg |
| 10/25/1994 |
Cleanup Assumed by ADEC |
Notification of ADEC assuming cleanup action. |
Ray Dronenburg |
| 10/25/1994 |
Update or Other Action |
(Old R:Base Action Code = SA2R - Phase II SA Review (CS)). Proposed remediation plan received 10/6/94 reviewed and commented on. Issues needing addressing are safety for children, increasing bioremediation soil pile turnover, and addressing contaminated liquid by-products disposal. |
Ray Dronenburg |
| 5/19/1995 |
Site Added to Database |
Site added to database. |
Ray Dronenburg |
| 4/26/1996 |
Update or Other Action |
(Old R:Base Action Code = RPL2 - Site Information Request Letter). Letter sent requesting corrective action. |
Bill Wright |
| 3/21/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Bill O'Connell |
| 5/15/2008 |
Update or Other Action |
The ADEC sent a letter to the LYSD requesting information on a missing report titled "Mountain Village Elementary School Addition Site Assessment dated February 1994." |
Grant Lidren |
| 12/16/2008 |
Update or Other Action |
ADEC communication with Design Alaska regarding plans to install a building south of the high school and west of the elementary school. During a phase 1 assessment petroleum constituents were detected. Design Alaska plans on sending the ADEC the Environmental Data Report. |
Grant Lidren |
| 12/23/2008 |
Update or Other Action |
ADEC received Environmental Data Report, Ignatius Beans School Improvements, and Mountain Village, AK, dated November 24, 2008, submitted by Shannon & Wilson and received by ADEC December 23, 2008. Soil samples taken at 20 to 25 ft. bgs contained DRO up to 733 mg/kg and benzene up to 0.0567 mg/kg. Soil boring depth was discontinued at 25 feet bgs due to presence of bedrock. Groundwater was not encountered. |
Grant Lidren |
| 12/23/2008 |
Update or Other Action |
The ADEC has not received a response from the letter sent to the LYSD on 5/15/2008 |
Grant Lidren |
| 1/6/2009 |
Update or Other Action |
The ADEC responded to a request by Design AK to treat potential contaminated soil that may be encountered during construction of a new school addition planned for the summer of 2009. The proposed building location is south of the high school and west of the elementary school. According to the2008 Ignatius Beans School Improvements Report, there is contamination in the subsurface at this location at 20 ft. bgs. Any contaminated soil encountered during construction activities will need to be removed and thermally treated or land farmed. |
Grant Lidren |
| 3/24/2010 |
Update or Other Action |
Site status Update. After review of the file, it appears the mid 1990s elementary school addition was built over the sites contaminated soil assessed in 1993 and 1994. The current tank farm, which is located just north of this elementary school addition, will be decommissioned and relocated further north at the old playground area. This work is planned for the summer 2010. |
Grant Lidren |
| 8/4/2011 |
Update or Other Action |
The public water system for Mountain Village Water System-High School Well is a Class A water system consisting of 4 source intake(s). The Mountain Village Water System-High School well is one of the four source intakes. This well is unconfined in fractured bedrock with a well depth of 195 feet. The water system is located in Mountain Village and the intake for this PWSID is a groundwater well. This water system has received a vulnerability rating of "high" for volatile organic chemicals, "very high" for heavy metals, "very high" for other organic chemicals, and "very high" for synthetic organic chemicals. According to the Drinking Water Program current monitoring summary dated March 2, 2011, the Mountain Village Water System last sampled for VOCs in January 2005 was non-detect. Currently, the water system is overdue for its next sampling event. |
Grant Lidren |
| 12/15/2011 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the Drinking Water Well Sampling Results in Mountain Village submitted by RSE and dated December 15, 2011. One pretreatment drinking water well (DWW) sample was collected from the well located near the Ignatius Beans Gymnasium and analyzed for DRO by AK method 102 and VOCs by EPA Method 524.2. The DWW samples contained DRO w/ Silica gel cleanup at 1.50 mg/L (note: the method blank contained DRO at 0.783 mg/L) and DRO at 0.466 mg/L. |
Grant Lidren |
| 3/13/2012 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78340 HOT. |
Grant Lidren |
| 8/28/2012 |
Update or Other Action |
In 2011 the former tank farm was removed and the area was capped with clean fill. The new tank farm consists of 8 horizontal tanks and is located just north of the old tank farm. |
Grant Lidren |
| 9/19/2012 |
Site Visit |
ADEC performed a site visit on this date. The former tank farm has been covered with 3 feet of clean fill above a liner. A wooden platform will be placed over the top of the fill at the former tank farm for an outdoor basketball court. The basketball court is constructed so that the goal posts that are set in the ground are outside the tank farm perimeter and that there is nothing that penetrates the surface of the contaminated old site or the liner. |
Grant Lidren |
| 1/13/2015 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78340 HOT. |
Joshua Barsis |
| 1/28/2016 |
Update or Other Action |
Sent a letter on this day in reference to this site. The purpose of the letter was to provide site history information and outline existing data gaps that need to be addressed before this site may be considered for closure.
SITE HISTORY:
Although no official spill reports exist within our files, several pertinent site investigation reports suggest that the contamination was likely from overfilling the six former vertical storage tanks used to heat the school. The tanks were situated within a containment area north of the elementary school and were filled via a partially buried fuel line that ran between the tanks and the Yukon River. The former tank farm has since been removed and the area has been capped with clean fill. The new tank farm consists of 8 horizontal tanks and is located just north of the old tank farm.
Evidence of a substantial release was identified on November 2, 1993 during a site assessment. The site assessment was performed to evaluate potential environmental impacts that could impede construction of a proposed addition to the Lower Yukon School Districts (LYSD) Mountain Village Elementary School. Five test pits were advanced across the school property to depths between four and eight feet below ground surface. Analytical samples were collected from select test pits based on field screening; and one sample was also collected from the southeast corner of the crawlspace beneath the cafeteria building, where a strong petroleum odor was noted. Analytical results from the initial site assessment revealed that petroleum contamination was present above cleanup levels in Test Pit #3 and the crawlspace. Test Pit #3 was advanced outside the northeast corner of the cafeteria building (beneath the current elementary school). Samples collected from Test Pit #3 exhibited a concentration of total petroleum hydrocarbons (THP) and extractable petroleum hydrocarbons (EPH) up to 28,000 mg/kg and 41,000 mg/kg, respectively. Levels up to 990mg/kg TPH and 2,500 mg/kg EPH were present in the sample collected from the crawlspace.
In May of 1994, excavation commenced to remove impacted soil from the area within the construction zone of the new elementary school. Roughly 600 cubic yards of material was removed and stockpiled for temporary storage. The final excavation dimensions were reported to be 50 feet wide, 50 feet long, and 11 feet deep. Excavation was limited vertically by fractured bedrock, and because the onsite equipment could not safely excavate to greater depths. Confirmation soil samples were collected from the base and sidewalls of the excavation. Sample results revealed that levels of TPH remain at the base of the excavation up to 580 mg/kg and in the sidewalls up to 2,950 mg/kg.
Final testing of the stockpiled material was performed in 1997. Results indicated that contamination within the stockpile was relatively low, and the stockpile was approved for re-use during road maintenance projects.
Several soil boring were advanced in October 2008 during a geotechnical investigation for additional school improvements. Three soil boring were advanced within the proposed school footprint, which was located south of the high school and west of the current elementary school (former cafeteria). Samples were collected from the soil borings and submitted for laboratory analyses of diesel range organics (DRO) and benzene, touene, ethylbenzene, and xylenes (BTEX). Analytical results revealed that DRO and benzene contamination is present at the bedrock at 25 feet below ground surface up to 733 mg/kg and 0.033 mg/kg, respectively. Field screening results from this investigation suggest that contamination is present from the surface down to bedrock.
Water samples were collected from the schools drinking water well in October of 2011 to determine if contamination was impacting the drinking water. The water sample was submitted for laboratory analysis of DRO and volatile organic compounds (VOCs). The sample was also submitted for silica gel cleanup. Silica gel cleanup removes naturally occurring (polar) compounds (such as organic matter) that may bias the DRO results high. DRO was identified at a concentration of 0.466 mg/l, which is below the cleanup level of 1.5 mg/l; however, DRO after silica gel cleanup was 1.5 mg/l. Several issues exist with this data, mainly that DRO after silica gel cleanup is generally lower than the original sample. In this this case it is much higher and it is a possibility that either the sample labels were switched, or the silica gel cleanup was not run correctly.
|
Joshua Barsis |
| 6/16/2016 |
Update or Other Action |
Sent work plan request letter to Lower Yukon School District superintendent. |
Erin Gleason |
| 7/5/2016 |
Update or Other Action |
Spoke with Robert Reed of LYSD on phone. The stockpile has been removed, no exact documentation but it is believe that it was spread on local roads. The drinking water well belongs to the city and the city does monitoring. Soil characterization has not been conducted after 2008. Discussed possible soil sampling with Mr. Reed. Samples could be collected ~30 feet away from the building. There is a small hoe in Mountain Village that could dig to eight feet. |
Erin Gleason |
| 7/6/2016 |
Update or Other Action |
Sent updated work plan request letter to LYSD superintendent. |
Erin Gleason |
| 10/25/2016 |
Update or Other Action |
Evaluated site for closure. To date, there is not enough information to close the site. Sent letter LYSD superintendent detailing the evaluation and findings. |
Erin Gleason |
| 4/28/2017 |
Update or Other Action |
Received email from maintenance director of LYSD, there are no construction plans for Mountain Village school during summer 2017. |
Erin Gleason |
| 6/21/2017 |
Update or Other Action |
Sent inventory letter providing list of all sites in the lower Yukon school district. |
Erin Gleason |
| 3/1/2019 |
Update or Other Action |
Received 2015 Bulk Fuel Assessment from Alaska Energy Authority |
Erin Gleason |
| 10/25/2019 |
Update or Other Action |
Sent inventory letter providing list of all sites in the Lower Yukon School District. |
Erin Gleason |
| 12/20/2019 |
Update or Other Action |
Received report from Restoration Sciences on behalf of the school district. The school district contracted Restoration Sciences in summer 2019 to samples numerous spills and contaminated sites in mountain village. Sampling was conducted without a pre-approved work plan from ADEC. |
Erin Gleason |
| 3/2/2020 |
Meeting or Teleconference Held |
Meeting held with PPR, CSP, school district, and restoration sciences to discuss the summer 2019 sample and reports. It was determined that all reports except the City Well House report pertain to PPR and not CSP. Restoration Sciences will revise the well house report and submit to CSP for review. |
Erin Gleason |
| 4/16/2020 |
Document, Report, or Work plan Review - other |
Received revised City Well House report from Restoration Science on 3/31/2020. ADEC has reviewed the report and requests some revisions. |
Erin Gleason |
| 5/13/2020 |
Document, Report, or Work plan Review - other |
Received revised city well house report from Restoration Sciences. |
Erin Gleason |
| 5/29/2020 |
Update or Other Action |
ADEC sent letter on this date to LYSD acknowledging their revised report. The report does not meet the requirements of 18 AAC 75 and cannot be approved by ADEC. However, the information in the report does provide good information about the City Well house. The next step for this site would be to submit a work plan for further characterization. |
Erin Gleason |
