Site Report: AS&G Palmer Gravel Pit
| Site Name: | AS&G Palmer Gravel Pit |
|---|---|
| Address: | NW of Mile 39 Glenn Hwy., ~0.5 Miles NW of Highway, Palmer, AK 99645 |
| File Number: | 2245.38.005 |
| Hazard ID: | 3926 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 61.568861 |
| Longitude: | -149.171070 |
| Horizontal Datum: |
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We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.
Problems/Comments
Diesel contamination found at the location of a former asphalt plant located at the northeast corner of the gravel pit. An estimated 30,000 tons of contaminated soil has been identified and is presently being landfarmed onsite.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 12/23/2003 | Site Added to Database | Diesel contamination. | Former Staff |
| 12/23/2003 | GIS Position Updated | Latitude and longitude is that of Soil Boring SB-03 where highest concentration of DRO was detected. Coordinates obtained from page 4 of ENSR International Report, "Palmer Pit - Former Asphalt Concrete Batch Plant, Beneficial Use Plan, 7/15/03. Despite no information on the origin of the latitude and longitude, the DBA has a high degree of confidence in the accuracy of the supplied coordinates based on plotting using TopoZone in conjunction with the Palmer-Wasilla Area Atlas. | Former Staff |
| 12/23/2003 | Site Ranked Using the AHRM | Initial ranking. | Former Staff |
| 4/15/2004 | Update or Other Action | File number assigned: 2245.38.005. | Sarah Cunningham |
| 5/25/2004 | Update or Other Action | Received figures and analytical sampling results in order to make a closure determination | Todd Blessing |
| 7/23/2004 | Update or Other Action | Received notebook of past correspondence with ENSR from ENSR in attempt to resolve data gaps discussed in previous conversations with Steve Wrenn. | Todd Blessing |
| 8/4/2004 | Update or Other Action | Submitted letter to AS&G and ENSR International requesting multiple tasks be performed prior to the Departments approval of landfarming activities and an NFA decision. | Todd Blessing |
| 12/1/2004 | Update or Other Action | Received memo from Steve Wrenn of ENSR International that discussed groundwater flow and control onsite. Groundwater tends to flow south-southwest throughout Gravel Pit. The memo also proposed the following long term actions with regard to the landfarm containing DRO contaminated soil: Mix contaminated soils in the landfarm area with nutrients and till them to promote microbial biotransformation of DRO; Sample and analyzing groundwater collected from wells #N and GG for GRO, BTEX, DRO, and RRO on an annual basis; Collect soil screening samples from the landfarm at various depths in a grid pattern six months following completion of the landfarm. Soil screening sample results will be used to select 20 areas were soil samples will be collected to be analyzed by a laboratory; and Control surface water transport through grading of the landfarm surface to provide drainage to the north away from the sites nearest receptors. | Todd Blessing |
| 12/6/2004 | Update or Other Action | Submitted letter to AS&G and ENSR International documenting no further action decision at excavation site. In addition, conditionally approved of ENSR's landfarming management proposal. Conditions of approval are as follows: AS&G will submit a brief one page work plan to the Department to conduct a geophysical survey of the perimeter of the landfarm to document the depth below ground surface of the clay layer and the clay layer thickness. | Todd Blessing |
| 12/22/2004 | Update or Other Action | Received Confining Layer Report. Sieve analysis results suggest that confining layer beneath landfarm is inconsistent. Discussed results with Jay Hargy of ENSR International Inc. Suggested that ENSR International investigate the possibility that sieve results were inaccurate. | Todd Blessing |
| 12/29/2004 | Update or Other Action | Received letter from Jay Hargy of ENSR International that discusses standards for confining layers in landfills. ENSR International believes that despite inconsistent grain size distribution of confining layer, the confining layer is protective of migration to groundwater pathway. | Todd Blessing |
| 1/5/2005 | Update or Other Action | Submitted letter to AS&G and ENSR International that states that the Department is in agreement with ENSR International regarding the protectiveness of the confining layer. AS&G is required to monitor downgradient monitoring wells annually and immediately report any results that confirm that downgradient monitoring wells exceed 18 AAC 75.345 Table C values. | Todd Blessing |
| 8/17/2005 | Update or Other Action | Discussed site with Jay Hargy of ENSR International Inc. Jay plans to sample groundwater monitoring wells in October of this year. | Todd Blessing |
| 12/1/2005 | Update or Other Action | Reviewed Palmer Pit Landfarming 2005 Report. Over the past two years landfarmed soil has been aggressively treated by the application of 8 tons of fertilizer and weekly tilling to enhance natural degregation of diesel contaminated soils. Areas of contaminated soil still remaining in the landfarm area has been delineated in July and October of this year. Approximately 585 cubic yards of contaminated soil is believed to remain in the landfarm area. Groundwater was collected from monitor wells downgradient of the landfarm area in October of this year. No diesel fuel constituents were detected in the groundwater samples. | Todd Blessing |
| 5/3/2006 | Update or Other Action | A work plan addendum for Palmer Pit Landfarm Management in 2006 was reviewed. ENSR constructed the work plan and proposes to screen contaminated soil with a PID and olfactory observations. Contaminated soil will be consolidated on the northern portion of the landfarm for focused treatment. Sampling of the actively landfarmed soil and groundwater will be conducted in late summer, 2006. The Department approves of the work plan addendum with the following qualifications: •AS&G will field screen every 10 cubic yards or 50 square feet of potentially contaminated soil; •A minimum of 5 confirmation soil samples will be collected following the field screening events; and •AS&G will conduct a correlation analysis to be reported to the Department of field screening and laboratory analytical results The Department also recommends that ENSR use commercially available laboratory test kits as opposed to a photoionizing detector in order to field screen potentially contaminated soils. Ultraviolet fluorescence test kits will likely provide a more accurate in the field assessment of DRO concentrations. | Todd Blessing |
| 10/5/2006 | Update or Other Action | Approved of a request by AS&G to treat approximaely 50 cubic yards of soil at Alaska Soil Recycling, Inc. A third party will collect confirmation soil samples. | Todd Blessing |
| 12/19/2006 | Update or Other Action | Reviewed a report, dated December 4, 2006, which documented recent site investigative activities at the AS&G Palmer Gravel Pit. The report, which was constructed by ENSR, provided evidence that all areas of contaminated soil have been adequately treated. The report recommends that the Department issue a closure determination for the AS&G Palmer Gravel Pit. At this time, the Department requests that AS&G submit a work plan to the Department by April 30, 2007 that defines the means and methods to decommission all monitor wells located on AS&G Palmer Gravel Pit property. | Todd Blessing |
| 1/11/2007 | Update or Other Action | Reviewed memorandum authored by Jonathan Schick of ENSR. Mr. Shick requested that the monitor wells located on-site not be decommissioned since AS&G would like to utilize the monitor wells to observe depth to groundwate over time. | Todd Blessing |
| 1/19/2007 | Record of Decision | Record of Decision recommending site closure signed. | Todd Blessing |
| 1/19/2007 | Site Closure Approved | The data presented to date indicates that the petroleum contaminated soil at the former Asphalt Concrete Batch Plant area has been excavated and treated to meet 18 AAC 75.341 cleanup levels. Therefore, the Palmer Gravel Pit site is closed and requires no further remedial action. This action will be noted on ADEC’s database to reflect its environmental status. This decision is subject to 18 AAC 75.380(d)(2) that may require additional investigation and/or cleanup action in the future if new information indicates there is hazardous substance contamination at this site that may pose a risk to human health and the environment. | Todd Blessing |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| For more information about this site, contact DEC at (907) 465-5390. |
Control Type
| Type | Details |
|---|---|
| No ICs Required |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. |
No associated sites were found.