| Action Date |
Action |
Description |
DEC Staff |
| 10/3/1991 |
Document, Report, or Work plan Review - other |
Date of receipt of report prepared by Harding Lawson on behalf of DEC entitled Soil and Groundwater Environmental Site Investigation. This work was conducted in response to petroleum constituents found in the city drinking water supply. This report documents soil contamination located on this school property associated with a fuel line leak, an area of unknown extent near the school tank farm, an area near the fuel barge transfer header, and an area associated with a day tank associated with a faculty housing unit. |
Keather McLoone |
| 11/17/2000 |
Document, Report, or Work plan Review - other |
Date of Marshall Site Reconnaissance Report prepared by Hart Crowser. This report stated that this effort did not identify "substantial contamination issues associated with the Lower Yukon School District Tank Farm". Four PID samples from within the bermed area had results up to 22 ppmv. One laboratory sample collected from 4 ft bgs immediately downgradient and outside the fence was analyzed for GRO, DRO/RRO, and BTEX with only benzene above current (as of Feb 2012) Migration to Groundwater at 0.0266 mg/kg benzene. |
Keather McLoone |
| 8/23/2011 |
Document, Report, or Work plan Review - other |
Receipt of Phase I Environmental Site Assessment: Old Marshall School Site prepared for Lower Yukon School District by R&M Consultants, Inc. |
Keather McLoone |
| 10/5/2011 |
Document, Report, or Work plan Review - other |
Receipt of Field Sampling Plan: Phase II Environmental Site Assessment prepared for Lower Yukon School District by R&M Consultants, Inc. |
Keather McLoone |
| 1/11/2012 |
Document, Report, or Work plan Review - other |
Receipt of Phase II Environmental Site Assessement: Old Marshall School Site prepared for Lower Yukon School District by R&M Consultants, Inc. |
Keather McLoone |
| 1/23/2012 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 1/31/2012 |
Meeting or Teleconference Held |
DEC met with Maserculig, the intended recipient of the pending land transfer, and their consultant, Shannon & Wilson. DEC's purpose in meeting was to learn more about what the future land uses. During this meeting, DEC learned that a Phase I had been produced by Shannon & Wilson on behalf of Maserculiq. |
Keather McLoone |
| 2/3/2012 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79233 name: Day Tanks and Tank Farm. Initial ranking based on Phase I information. Updated ranking will be done to include information from Phase II effort. Additional characterization will be needed and another ranking performed when additional site data is available. |
Keather McLoone |
| 3/5/2012 |
Update or Other Action |
Date of receipt of a proposed scope/cleanup list from LYSD consultant for review and comment. |
Keather McLoone |
| 3/19/2012 |
Update or Other Action |
Receipt of letter report entitled Summary of Environmental Document Review from Shannon & Wilson written to their client Maserculiq. |
Keather McLoone |
| 4/17/2012 |
Update or Other Action |
Receipt of Site Cleanup Plan submitted by R&M on behalf LYSD. |
Keather McLoone |
| 6/15/2013 |
Document, Report, or Work plan Review - other |
Reviewed Cleanup Report for Marshall Former School Day Tanks and Tank Farm. Seven known or potential source areas were included in the 2012 cleanup effort, these area are known as Sites A-G. Site A is the former Tank Farm, which stored heating oil and gasoline for use by LYSD. Two primary excavations were conducted, which eventually merged into one excavation from which approximately 580 cy of contaminated soil were removed. Excavation was conducted in these areas to a depth of 6-9 feet bgs. Additional excavation was conducted along the edges where field screening indicated contaminated surface soil remained. Before the primary excavations were backfilled, a test pit was excavated to the bedrock interface approximately 15 feet bgs to evaluate the vertical extent of contamination. Samples from the bottom of the test pit contained DRO up to 2,100 mg/kg and GRO up to 329 mg/kg. Groundwater was not encountered.
Site B is the Day Tank by the Maintenance Garage. Approximately 16 cy of contaminated soil were removed from this source area from an excavation that eventually merged with the adjacent Site A excavation. Soil was removed to a depth of 2 feet bgs. Confirmation soil samples collected from the side of the excavation 18” bgs contained DRO up to 14,100 mg/kg.
Site C is the Former Day Tank by the Old School. Approximately 44 cy of contaminated soil were removed from this source area to a depth of approximately 2 feet bgs. Confirmation soil samples contained DRO up to 35,600 mg/kg. A test pit was excavated to refusal approximately 11.5 feet bgs to evaluate the vertical extent of contamination. A soil sample from the bottom of the excavation contained DRO up to 1,420 mg/kg.
Site D is an existing day tank by the Maintenance Office. Approximately 8 cy of contaminated soil was excavated to a depth of approximately 2 feet bgs. The presence of the day tank limited the extent of excavation in this area. Confirmation samples collected from the bottom of the excavation contained DRO up to 9,020 mg/kg. A test pit was excavated to approximately 5 feet bgs to evaluate the vertical extent of contamination. The depth of the test pit was limited by the presence of the AST and the foundation of the building. The sample from the bottom of the test pit did not contain detectable concentrations of contaminants.
Site E is the Existing Teacher’s Housing Day Tank. Soil was excavated to approximately 2.5 feet bgs and one sample was collected that contained DRO at 258 mg/kg. It appears that no soil was removed and the excavation was backfilled with the excavated material.
Site F is the Maintenance Garage Interior, which had visible staining on the gravel floor. Approximately ½ cy of contaminated soil was removed from the stained area to a depth of approximately 4 inches. A confirmation soil sample collected beneath the stained area did not contain contaminants above cleanup levels.
Site G is the Buried 2” Fuel Line reportedly present near the former school building. Three trenches were excavated in the reported area of the fuel line to a depth of two feet bgs. No fuel line was found and no indication of contamination was present. Following review of the report, ADEC requested that additional surface soil samples be collected around the perimeter of the Sites A/B excavation to confirm the removal of contaminated surface soil.
|
Bill O'Connell |
| 9/27/2013 |
Document, Report, or Work plan Review - other |
Reviewed work plan to collect surface soil samples around the perimeter of Sites A and B to confirm the removal of contaminated surface soil. |
Bill O'Connell |
| 9/27/2013 |
Document, Report, or Work plan Review - other |
Reviewed work plan to collect surface soil samples around the perimeter of Sites A and B to confirm the removal of contaminated surface soil. |
Bill O'Connell |
| 11/13/2013 |
Document, Report, or Work plan Review - other |
Reviewed Marshall Former School Tank Farm and Day Tanks Closeout Sampling Report. The objective of this sampling effort was to confirm the removal of contaminated soil from 0-2 feet bgs, around the perimeter of the tank farm excavation that was conducted in 2012. Two portions near Area A and one portion of Area B were sampled at several depths for a total of 8 samples. Contaminants were not detected above cleanup levels in any of the samples. |
Bill O'Connell |
| 11/18/2013 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79233 Day Tanks and Tank Farm. |
Bill O'Connell |
| 4/23/2014 |
Cleanup Complete Determination Issued |
Contamination remains on site above established default cleanup levels, however ADEC has determined there is no unacceptable risk to human health or the environment. Therefore this site will be issued a Cleanup Complete- ICs determination subject to the following.
1. Any future change in land use may impact the exposure assumptions cited in this document. If land use and/or ownership changes, current ICs may not be protective and ADEC may require additional remediation and/or ICs. Therefore the Lower Yukon School District and ADOT&PF or their designees shall report to ADEC every five years to document land use, or as soon as they become aware of any change in land ownership and/or use, if earlier. The report can be sent to the local ADEC office or electronically to DEC.ICUnit@alaska.gov.
2. A Notice of Environmental Contamination (Attachment C) will be recorded at the Alaska Department of Natural Resources Recorders Office indicating that contamination remains at the site above default cleanup levels and detailing the Institutional Controls in place at the site.
3. Installation of groundwater well will require prior approval from the ADEC Contaminated Sites Program
4. Any proposal to transport soil or groundwater off site requires ADEC approval in accordance with 18 AAC 75.325 (i). A “site” [as defined by 18 AAC 75.990 (115)] means an area that is contaminated, including areas contaminated by the migration of hazardous substances from a source area, regardless of property ownership. (See attached site figure.)
5. Movement or use of contaminated material in a manner that results in a violation of 18 AAC 70 water quality standards is prohibited.
|
Bill O'Connell |
| 4/23/2014 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Bill O'Connell |
| 6/3/2024 |
Institutional Control Compliance Review |
IC compliance review completed on this date. An IC reminder letter was issued to the landowner. The next review will be in five years’ time. |
Gaige Robinson |
