| Action Date |
Action |
Description |
DEC Staff |
| 8/29/2008 |
Site Added to Database |
Site added to the database. |
Mitzi Read |
| 9/4/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 75808 name: Contaminated Fill Material |
Mitzi Read |
| 4/27/2009 |
Update or Other Action |
DEC recieved a letter authored by Susan Reeves discussing their attempts to reasearch the details regarding the disposal of PCB contaminated soil on the property. Ms. Reeve documented that Municipality of Anchorage (MOA) personnel interviews with affiliated parties suggested that PCB contaminated soil likely was transported to the subject property during the development of the Glenn Square project in 2006. Ms. Reeves could not definitively confirm through their research how much soil was disposed at the subject site and who approved of the disposal. She suggested that MOA never approved of the disposal. The Heritage land bank (HLB), however, issued a permit to Pruhs Construction in August 2006 for the disposal of 10,000 cubic yards from a road improvement project near the MOA Porcupine Pit contaminated site. No report documenting this activity was ever received by HLB. The Boutet Company (TBC) was contracted by the Municipality of Anchorage to provide project management services for the Glenn Square project. This company estimates that 3,000 cubic yards of soil was transported to the subject property. In 2008, Shannon and Wilson estimated that the amount of fill material disposed was roughly 25,000 cubic yards. |
Todd Blessing |
| 4/29/2009 |
Potentially Responsible Party/State Interest Letter |
DEC has determined that MOA is a potential responsible party for known soil contamination at Parcel 3, Tract B Municipal Industrial Subdivision. DEC’s cleanup process requires that responsible parties hire qualified people to evaluate the risks posed to human health and the environment from contaminated soil and/or groundwater. MOA will need to hire a consultant to prepare a release investigation or cleanup work plan by June 30, 2009 for review and approval by DEC and EPA. |
Todd Blessing |
| 6/3/2009 |
Site Characterization Report Approved |
DEC staff reviewed and approved Alta Geosciences, Inc.'s (Alta) Site Investigation Work Plan, dated may 29, 2009. Alta proposed to do the following:
• Complete one deep soil boring through the fill to native soil near the proximate location of Test Pit 3 (TP-3). Soil samples will be collected every five feet except for the first five feet, two soil samples will be collected.
• Complete two shallow soil borings to depths of 10 feet below ground surface at locations roughly 25 feet from TP-3. Soil samples will be collected at depths of 2.5, 5.0, 7.5, and 10 feet below ground surface.
• Collect approximately 20 shallow soil samples from depths of 0.5 to 1.0 feet in areas potentially contaminated with PCBs.
By this letter CSP approves of your work plan dated May 29, 2008 with the following conditions:
1. Alta will adhere to CSP’s Laboratory Data and Quality Assurance Policy (Tech Memo 06-002) when collecting and evaluating laboratory analytical data.
2. Alta will develop a conceptual site model (CSM) for the subject site; and
3. Alta will obtain EPA’s approval of the work plan prior to implementing any field work.
|
Todd Blessing |
| 8/13/2009 |
Site Characterization Report Approved |
DEC staff reviewed AlTA Geosciences, Inc.'s "Site Investigation Report, Reeve Blvd. Site", Dated July 2009. Alta GeoSciences, Inc. (Alta) presented the results of an investigation to define the nature and extent of PCB contamination. In this investigation, one deep soil boring was advanced near former test pit TP-3 into native fill. Two shallow soil borings were advanced approximately 25 feet from the former TP-3 location. Nineteen shalow soil samples were collected on a 20 foot grid basis around TP-3, and TP-4, all from 0.5 to 1.0 feet below ground surface. A total of 32 soil samples and two duplicates were analyzed by Test America for PCBs.
The levels of PCBs between 1 and 10 mg/kg is fairly widespread. In two locations the levels of PCB's exceeded 10 mg/kg at depths of 2.5 and 5 feet. The depth of fill was determined to have a maximum thickness of 26 feet. No PCBs were detected above 1 mg/kg at depths below 10 feet.
DEC staff met with representatives of the MOA on August 11th, and discussed the results of this site investigation. MOA proposed to collect additional soil samples to determine the extent of soil impacted with PCB's. DEC staff agreed with this approach and requested MOA providea work plan for DEC review. |
Todd Blessing |
| 9/9/2009 |
Site Characterization Workplan Approved |
DEC reviewed and approved Alta Geosciences, Inc. “Supplemental Site Investigation Work Plan”, dated August 24, 2009. Alta Geosciences Inc. (Alta) proposes to do the following:
1. Collect approximately 8 shallow soil samples from depth of 0.5 to 1.0 feet below ground surface (bgs) from the lower bench area.
2. Collect approximately 29 shallow soil samples from depths of 0.5 to 1.0 feet bgs from the upper bench area.
3. Advance four soil borings in the upper bench area to native fill and collect soil samples at 2.5 feet, 5.0 feet, and every five feet thereafter until native soil is encountered.
|
Todd Blessing |
| 9/24/2009 |
Update or Other Action |
DEC recieved an approval letter from Dan Duncan of EPA dated September 11, 2009 regarding Alta Geosciences' "Fill Permit Plans and Remediation Concept" dated August 21, 2009. Alta Geosciences plans to remove soil containing PCB's greater than 10 mg/kg from the site and dispose of these soils in an appropriate remediation facility. Soils between 1 and 10 mg/kg will be left on site and capped with 3 feet of clean soil and potential structures or pavement. DEC approved of the concept in a email dated September 24th provided the cap is finalized with an asphalt or pavement surface or immovable structure. Alta Geosciences may also need to provide a work plan for delineating PCB's contaminated soils depending on the results of the pending site investigation. |
Todd Blessing |
| 10/27/2009 |
Site Characterization Report Approved |
DEC staff reviewed Alta Geosciences, Inc. “Supplemental Site Investigation Report Reeve Blvd. Site”, dated October, 2009. Alta Geosciences Inc. (Alta) documented soil sampling and analysis for PCBs at the subject site. Alta conducted two investigations: One in June and one in September 2009. A total of 46 shallow soil samples were collected from the top of the fill in the upper bench area. Thirteen shallow soil samples were collected from the lower bench area. In addition, six soil borings were advanced at the site and nineteen soil samples were collected from a split spoon sampler. Twenty two samples contained PCB’s greater than 1 mg/kg; two samples contained PCB’s greater than 50 mg/kg. Both studies confirmed that soil contaminated with PCB’s above 1 mg/kg is confined to the upper bench area and is not below 11.5 feet from the ground surface. DEC issued a letter on October 27, 2009 commenting on the report and notifying MOA that the relative extent of PCB contaminated soil had been defined. |
Todd Blessing |
| 4/27/2010 |
Site Characterization Workplan Approved |
DEC staff reviewed and approved of Alta Geosciences "Preremediation Soil Characterization Work Plan", which was dated April 9, 2010. Alta Geosciences Inc. (Alta) proposes to advance twenty two soil borings down to a depth of 12 feet. Soil samples will be collected at a rate of one per foot of depth interval. Approximately eight grid squares located on sloping ground will be investigated by using hand tools or by sampling backhoe test pits. Alta estimates that 200 soil samples will be collected to be analyzed for PCB’s by EPA method 8082. Soil cuttings will be place in drums pending receipt of analytical results and a determination of appropriate disposal during the remediation. |
Todd Blessing |
| 5/26/2010 |
Cleanup Plan Approved |
DEC staff reviewed and approved of Alta Geosciences "Self Implementing Cleanup Plan, Reeve Blvd. Site", dated March, 2010 and "Field Sampling/Quality Assurance Project Plan", dated April 20, 2010. Alta Geosciences proposed to do the following:
1. Soils with PCB concentrations of 0-1 mg/kg will be left in place or temporarily excavated and stockpiled to allow access to more highly impacted soil and subsequently used as cover.
2. Soils with PCB concentrations of 1-10 mg/kg will be excavated and stockpiled as needed. These soils will eventually be placed at the base of the excavation and then capped with a geomembrane system and 5 feet of clean soil.
3. Soils with PCB concentrations of 10-49 mg/kg will be excavated and transported to an industrial landfill.
4. Soils with PCB concentrations of 50 mg/kg or greater will be excavated and transported to a TSCA certified landfill.
|
Todd Blessing |
| 7/23/2010 |
Site Characterization Report Approved |
DEC staff reviewed Alta Geosciences' "Preremediation Soil Characterization Report Reeve Blvd. Site" dated July 2010. Alta Geosciences (Alta) documented sampling and analysis of PCB's in soil for Alta's cleanup plan, which was approved in April 2010. The purpose of the investigation was to better define the vertical and horizontal extent of PCB's that require remediation. A total of 24 boring and 8 test pits were completed and 218 soil samples were collected. Testing results showed that 7 samples had concentrations of PCBs greater than 50 mg/kg, 94 samples had PCB concentrations between 1 and 10 mg/kg, and 24 samples had concentrations of PCBs between non-detect and 1 mg/kg. In fifty samples, PCBs were not detected. |
Todd Blessing |
| 7/5/2011 |
Update or Other Action |
DEC staff reviewed Municipality of Anchorage's Reeve Blvd HLB Parcel Site Remediation 10-06 document. This document defined the specifications for cleaning up site contamination in accordance with Alta Geosciences "Self Implementing Cleanup Plan, Reeve Blvd. Site", dated March, 2010. Staff had no comments on the subject report other than that we be notified when cleanup activities begin. |
Todd Blessing |
| 9/15/2011 |
Update or Other Action |
Staff recieved an email from Dave Bartus of EPA's Region 10. Dave commented on Alta's cleanup plan and suggested that MOA resubmit their plan under risk-based disposal authority of CFR 761.61(c). This regulation provides the EPA with authority to approve sampling, cleanup or disposal of PCB remediation waste in a manner other than prescribed in 40 C.F.R. 761.61(a) or (b). Dave informed MOA that the previous cleanup plan under 761.61(a)which is the self implementing cleanup plan did not meet the regulatory sampling compliance requirements. Dave, requested that both Alta and MOA provide written confirmation of their intent to seek risk-based disposal approval under CFR 761.61(c). In addition, he requested that they utilize Method 3546 or 3546 to extract PCB's instead of method 3550. |
Todd Blessing |
| 9/10/2012 |
Update or Other Action |
Staff reviewed Alta Geosciences "Remediation Construction Completion Report, Dated August 2012. The report documented the soil excavation and management set forth in the Alta's Self Implementing Cleanup Plan, dated March 2010. All soils known to contain 50 mg/kg PCBs or greater were excavated and disposed of offsite at at TSCA permitted landfill in Oregon. All soils known to contain greater than 10 but less than 50 mg/kg were excavated and disposed of offsite at an appropriatly permitted Subtitle D landfill in Oregon. All remaining soil with PCB's greater than 1 mg/kg but less than 10 mg/kg were excavated and placed in the bottom of the resulting excavation, capped with a geomembrane cap system, and covered with at least three feet of soils containing 1 mg/kg PCBs or less. |
Todd Blessing |
| 6/17/2013 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75808 Contaminated Fill Material. |
Jacob Gano |
| 11/6/2015 |
Update or Other Action |
The EPA approved of the Risk-Based Disposal Approval (RBDA) for Cleanup of PCB Remediation Waste in accordance with the Section 761.61 of the Toxic Substances Control Act (TSCA). The approval included 17 conditions. The conditions of the RBDA describing excavation, disposal, capping, and revegetation have all been completed. In addition to those physical conditions of remediation, the EPA has also required that land use must remain commercial/ industrial and that no excavation is allowed that would damage the cap. The Municipality of Anchorage (MOA)must inform the EPA of any potential sale or transfer of the property and must provide the EPA with a brief report, no later than the close of every calendar year, documenting annual inspection of the cap and drainage system and any repairs or maintenance conducted. The RBDA is attached. |
Lisa Krebs-Barsis |
| 5/13/2016 |
Cleanup Complete Determination Issued |
The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) has completed a review of the environmental records associated with the MOA Parcel 3 Tract B Municipal Industrial Subdivision; located on Commercial Drive in Anchorage, Alaska. Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and no further remedial action will be required as long as the site is in compliance with established institutional controls. |
Chelsy Passmore |
| 5/13/2016 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Chelsy Passmore |
| 8/15/2024 |
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 |
