| Action Date |
Action |
Description |
DEC Staff |
| 10/28/2002 |
Update or Other Action |
The department received the AlasChem Engineering report, "Lot 2 Block 1 Unit No. 1 Timbered Acres Sub., Palmer; Release Notice and Request for Site Manager", dated 10/25/02. |
Bill Petrik |
| 11/26/2002 |
Site Added to Database |
DRO. |
Elizabeth Stergiou |
| 11/27/2002 |
Site Ranked Using the AHRM |
Initial ranking. Multiple Sources checked because releases have been identified from both an AST and an UST. |
Elizabeth Stergiou |
| 11/27/2002 |
GIS Position Updated |
Location determined from TopoZone and a property boundary diagram. |
Elizabeth Stergiou |
| 7/16/2004 |
Update or Other Action |
File number issued 2245.38.011. |
Aggie Blandford |
| 3/14/2006 |
Update or Other Action |
Staff changed from Sundet to Petrik. |
Bill Petrik |
| 3/15/2006 |
GIS Position Updated |
Updated the latitude and longitude using TopoZone Pro in conjunction with site maps and the Mat-Su Borough GIS Interactive Mapping Services. Used a Large Size Map with 1:24,000 Scale USGS Topo Base map viewed at 1:10,000 Scale. High degree of confidence in coordinates. Could be improved using GPS on site or Refernced Aerial Photo Overlay. |
Bill Petrik |
| 3/20/2006 |
Update or Other Action |
Sent an initial contact letter to RP with a cc to the consultant. Much more site information needed such as UST removal details as well as a site characterization. The letter included a paragraph indicating the department's intent to cost recover on work performed related to the site. |
Bill Petrik |
| 5/23/2006 |
Update or Other Action |
The department provided comments regarding its review of the report, "Lot 2 Block 1 Unit No. 1 Timbered Acres Sub., Palmer; Release Notice and Request for Site Manager," dated October 25, 2002, prepared by AlaskChem Engineering. In that letter, the department also requested clarification of several issues that were discussed in AlaskChem’s report. The report was received by ADEC on October 28, 2002. The ADEC requested a site characterization be performed to determine the vertical and horizontal extent of contamination attributable to diesel releases from an UST and an AST. A work plan and a CSM were requested. |
Bill Petrik |
| 7/12/2006 |
Update or Other Action |
Reviewed the AlaskChem Engineering “Holcomb Site Closure Workplan” dated June 23, 2006, received by the department on June 26, 2006 for a site located in Palmer. A letter sent pointed out numerous problems with the workplan and the need for clarification on many issues. The ADEC requested a response to the questions as well as a revised work plan be submitted to the department. |
Bill Petrik |
| 9/12/2006 |
Interim Removal Action Approved |
On 9/12/06, DEC conditionally approved a portion of AlaskChem's "Holcomb Site Closure Workplan" dated June 23, 2006. The portion approved was that for the removal of soil contamination in association with the heating tank UST release. The letter conditioned that the soil be properly stockpiled at the site as well as other conditions. Based upon information collected regarding the petroleum contaminant levels and currently unknown characteristics of the site, an amended plan can be submitted at a later date that may propose landfarming at the site provided that document provides information that demonstrates that a risk is not posed to human health or the environment. |
Rich Sundet |
| 10/20/2006 |
Update or Other Action |
Staff changed from Petrik to Sundet. |
Bill Petrik |
| 10/30/2006 |
Update or Other Action |
On 10/30/06, CS Manager Bainbridge responded to several September and October 2006 emails from Hulbert regarding several issues, including a request to change supervisor and a sampling method to separate the asphaltic material from the mixed excavated contaminated site soil. DEC's letter denied a change of DEC project manager and noted that CS staff had earlier provided suggestions to Hulbert to resolve his potential issue with future sampling to determine whether the contaminated soil would be attenuating by not mixing the soil with the asphaltic material. CS's letter described the next steps for the site. CS's letter also noted that staff had suggested to Hulbert that he could possibly landfarm the excavated soil and further noted that it may be possible to also landspread the excavated soil that is currently stockpiled on site. However, prior to approving of such a treatment plan, DEC needed to evaluate the cleanup report which needed to include information demonstrating that the landfarmed/landspread material would not not pose a risk to human health or the environment. In addition, the report should include a workplan for the disposal/treatment of the excavated soil, and that the asphaltic material be managed under 18 AAC 60 regulations unless it is managed to meet 18 AAC 60.005(c) exemption and benefical use per 18 AAC 60.008. CS's letter also suggested that to demonstrate the the excavated soil is attenuating after mixed with asphaltic material and landspread on site, Hulbert select the finer soils which are not asphaltic material for BTEX analysis and sieve out the asphaltic material for DRO/RRO anaylsis. |
Steve Bainbridge |
| 4/17/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Rich Sundet |
| 4/22/2008 |
Update or Other Action |
On 4/22/08, the Attorney General's Office informed DEC that John Holcolm had agreed to a monthly payment plan to reimburse the state for DEC's outstanding oversight costs on this site. The letter also noted that Holcomb paid $300.00 of his outstanding bill. |
Rich Sundet |
| 6/24/2008 |
Update or Other Action |
On 6/24/08, DEC provided comments on AlaskChem’s cleanup report titled “Excavation Report for Holcomb Residence Lot 2, Block 1, Timbered Acres Subdivision Unit #, Palmer, Alaska" dated March 2007. CSP received the report on April 3, 2007. The report states that on September 21, 2006, excavation began to 11 feet below ground surface (bgs) and that while there was concern whether the excavation would impact the integrity of the building on-site, the report on page 1 (and elsewhere) indicates that all contamination above default cleanup levels was removed. Approximately 200 cubic yards of contaminated soil was excavated in the northeast corner of the residence on property and in an area of the former UST that had contained diesel or heating fuel oil.
The former AST which apparently had also contained diesel fuel, had been located in the nearby area but releases from that tank were not addressed, mentioned, or shown on Figure 4 in the March 2007 report. Both tanks had been reported as previously having releases by AlaskChem. The extent of the contamination of weathered diesel fuel in the field was determined using a photoionizing detector (PID) coupled with olfactory evidence. Excavated soils were temporarily stockpiled on the northeast portion of the property. Samples for laboratory analysis were based upon the highest PID readings.
A total of seven samples were analyzed from the bottom of the excavation or its sidewalls; two samples analyzed from the stockpile; and one sample from the asphalt soil where the intended excavated soil is proposed to be used as sub-base for a parking area.
A composite confirmation sample collected in the stockpile (HST-1) showed that soil in the stockpile exceeded the applicable cleanup level for diesel range organics (DRO) at 335 mg/kg (the applicable cleanup level for DRO is 250 mg/kg) and the three composite confirmation samples collected from the bottom of excavation floor showed a maximum of 89.9 mg/kg DRO. However apparently no samples were analyzed for DRO from the sidewalls (i.e., HWS-1 and HES-1).
A composite sample from the stockpile (HSTW) showed non-detect for benzene, ethylbenzene and toluene and 0.401 mg/kg total xylenes and 7.43 mg/kg GRO, which the latter two constituents were well below applicable cleanup levels. A confirmation sample collected in the excavation (H2-4) showed 0.0196 mg/kg benzene, which was slightly less than its applicable cleanup level of 0.02 mg/kg; and confirmation samples from the excavation sidewalls (H3-2 and H4-9) ND for benzene, ethylbenzene, toluene, and GRO showed up to 0.186 mg/kg total xylenes, which was well below its cleanup level.
A completed conceptual site model and laboratory checklist along with laboratory data, and photographs of the excavation activities, accompanied the report.
In addition to the above, the report included Appendix 5 which was a “Stockpile Remediation Workplan.” The work plan proposes to treat the 200 cy of stockpiled soil that was excavated in fall 2006. The plan proposes to spread the approximately 200 cy of excavated soil in the existing stockpile in a shallow lifts coupled with spreading lawn fertilizer on the top of each lift to a total depth of about one (1) foot over native soils as a sub-base for a parking area/driveway. The 200 cy of material would be spread over an area measuring about 50 ft. x 100 ft. in an area just east of the residence on site and covered with crushed gravel.
In its letter DEC requested: 1) clarification whether the area beneath the AST was adequately addressed during the cleanup. 2) resample the area in the excavation floor where sample H2-4 was collected from along with a duplicate sample.
DEC also suggested resampling of the stockpile to determine whether it meets applciable cleanup levels. |
Rich Sundet |
| 10/8/2013 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 74902 UST home heating tank. |
Bill O'Connell |
| 10/10/2013 |
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 site known as Residence- Holcomb Property home heating oil (HHO) underground storage tank (UST) located at 1430 Irwin Road in Palmer, 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 this site will be closed. |
Bill O'Connell |
