| Action Date |
Action |
Description |
DEC Staff |
| 8/15/2006 |
Update or Other Action |
In 2006, a Site Assessment was performed on three previously removed regulated Underground Storage Tanks (USTs) including a 1,000 gallon diesel UST located adjacent to the UIC sump steel pipe. Soil samples collected at the groundwater interface, 6 feet bgs, contained benzene up to 0.0622 mg/kg. This benzene level was attributed to the UIC well as indicated in a decision document for Dean's Auto Salvage USTs dated February 23, 2010(file: 2100.26.563). |
Grant Lidren |
| 4/23/2007 |
Document, Report, or Work plan Review - other |
Reviewed the Class V Closure Report for Drywell 1 and Drywell 2 at Deans's Auto, 720 East Whitney Rd. Both drywells were located in a Quonset Hut at the site and were not known to have been used for direct disposal of liquids. Drywell 1 was a perforated PVC pipe extending 42 feet to the west. Field screening was conducted along the length of the pipe and a sample was collected from the outlet of the pipe. Drywell 2 was a perforated, open ended drum with a grate over it, and a sample was collected beneath the drum. Neither sample contained contaminants above ADEC cleanup levels and both drywells were filled with concrete. This report also contains information on a third UIC, the Warehouse Floor Drain. This floor drain was partially investigated in 2006 and was found to consist of a vertical corrugated metal pipe with a drain-rock structure. Contaminated soil found in this vicinty was excavated and disposed of as RCRA Haz waste. Additional contaminated soil was excavated and stockpiled on site pending further investigation of the UIC drain field. |
Bill O'Connell |
| 4/27/2007 |
Exposure Tracking Model Ranking |
Initial ranking completed. |
Mitzi Read |
| 4/27/2007 |
Site Added to Database |
Site added to the database. |
Mitzi Read |
| 7/14/2009 |
Document, Report, or Work plan Review - other |
Reviewed UIC Closure Interim Status Report and Workplan for Landfarm Treatment of Contaminated Soil. The vertical CMP will be removed as part of the UIC closure and excavation will continue in areas found to be contaminated based on 2006 sampling. Considering the shallow depth to groundwater, it is anticipated that some contaminated soil will remain in the smear zone and likely under the warehouse following excavation. The work plan proposes an onsite land farm as a remedial option for approximately 250 cy of contaminated soils from the UIC excavation and a prior UST excavation. An attempt will be made to divert groundwater from the excavation by pumping down the water table upgradient of the excavation site and discharging water to a downgradient location |
Bill O'Connell |
| 7/21/2009 |
Document, Report, or Work plan Review - other |
Revised Work Plan reviewed for Deans Auto. Based on discussions with ARRC, long term land farming is not a viable option at this site. Therefore, in addition to UIC closure work at the site, the 40 cy stockpile from previous UIC work, and the additional 60 cy of soil expected to be excavated at the area of impact from the UIC well, will be transported to ASR for treatment. The 150 cy stockpile of soil created during UST removals will be segregated on site with the objective of minimizing the amount of soil transported off site for treatment. Following field screening and segregation, soil samples will be collected from the UST soil to evaluate contaminant concentrations and disposal options. |
Bill O'Connell |
| 6/2/2010 |
Document, Report, or Work plan Review - other |
On this date, ADEC received UIC Class V Closure Report submitted by RSE and dated May 12, 2010. On July 22, 2009, the 6 ft. CMP and 10 cy of “septic” odor contaminated soil was removed. The contaminated soil was added to the historic stockpile generated in 2006. Approximately 637 gal. of water was pumped from the CMP into a 5,000 gal. holding tank prior to removal by Emerald Services. Three soil samples collected at 5 to 5.5 ft. bgs contained DRO up to 7,780 mg/kg, GRO up to 349 mg/kg, and RRO up to 17,200 mg/kg. |
Grant Lidren |
| 7/19/2010 |
Update or Other Action |
On this date ADEC received the UIC Class V Closure Report for the injection well in the shop/warehouse at Dean’s Auto Salvage submitted by EPA. The UIC at this site is permanently closed. |
Grant Lidren |
| 10/7/2010 |
Meeting or Teleconference Held |
Per a meeting with Dean and RSE on October 7, 2010, The ADEC has determined further action is needed at the Dean's Auto Salvage UICs to treat the 40 cubic yard onsite stockpile and to delineate the extent of soil and groundwater contamination. Historic groundwater wells and new monitoring wells, advanced adjacent to the property line, will need to be sampled. During the advancement of the new monitoring wells, two soil samples should be collected from each borehole with one of those samples collected at the groundwater interface. Samples should be analyzed for DRO, GRO, RRO, and BTEX and the sample with the highest PID results should also be analyzed for VOCs by Method 8260. |
Grant Lidren |
| 10/11/2010 |
Site Visit |
On this date, ADEC met w/ RSE at the site to survey historic MWs and explore areas to install new MWs. It appears the historic MWs are located too far away from the source area and the expected migration pathway. Therefore MW(s) will need to be advanced downgradient of the source area on the property line. |
Grant Lidren |
| 10/14/2010 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the Workplan for Former UIC Closure Assessment and Treatment of Stockpiled Soils, submitted by RSE. A monitoring well will be advanced downgradient of the former UICs to the groundwater interface at a depth of at least eight feet bgs, where two groundwater samples will be collected. During the advancement of the monitoring well, three soil samples will be collected with one of those samples collected at the groundwater interface. Samples will be analyzed for DRO, GRO, RRO, and BTEX and the sample with the highest PID results should also be analyzed for VOCs by Method 8260. In addition, the historic 50 cubic yard stockpile will be transported to ASR for thermal remediation. Work is tenatively planned for the summer of 2011. |
Grant Lidren |
| 5/1/2012 |
Potentially Responsible Party/State Interest Letter |
ADEC sent PRP letter on this date |
Grant Lidren |
| 10/2/2012 |
Site Characterization Report Approved |
On this date, ADEC received the Former UIC Closure Report Dean’s Auto Salvage submitted by RSE dated September 2012. The 50 cy contaminated soil stockpile was transported to ASR and thermally remediated. A boring, completed as monitoring well MW-1, was advanced down gradient of the former UICs to a depth of 10 feet bgs. A soil sample collected at the GW interface at 4 feet bgs contained detectable concentrations of contaminants, but below cleanup levels. Two groundwater samples collected contained detectable concentrations of contaminants, but below cleanup levels. An additional boring was advanced 6 feet to the north of MW-1. Two soil samples collected at 2.5 feet bgs, just above the GW interface, contained detectable concentrations of contaminants, but below cleanup levels. |
Grant Lidren |
| 2/8/2013 |
Site Characterization Report Approved |
On this date, ADEC received the Additional Site Investigation Report Dean’s Auto Salvage submitted by RSE dated February 2013. Seven soil boring were advanced with one completed as a temporary MW in the source area. Ten soil samples were collected from the soil borings at the GW interface 7 to 9 feet bgs and/or at elevated pid readings. Only two of the soil borings contained DRO concentrations above ADEC migration to groundwater cleanup levels from soil samples collected at the GW interface. A soil sample collected from TB2 at a depth of 9ft. bgs contained DRO at 371 mg/kg and a soil sample collected from TB-4 at a depth of 7 ft. bgs contained DRO at 2,490 mg/kg. A groundwater sample collected contained DRO up to 0.204 mg/L, which is below the ADEC Table C GW cleanup level of 1.5 mg/L. |
Grant Lidren |
| 3/1/2013 |
Site Characterization Report Approved |
On this date, ADEC received the Phase II ESA submitted by RSE dated March 2013. Soil samples collected for this investigation collected from 6 boreholes were below ADEC cleanup levels with the exception of a soil sample collected from B1 at a depth of 6.5 feet bgs, which contained benzene up to 0.0585 mg/kg. Three additional borings, B1-N, B1-SW, and B1-SE were placed within a 3-foot radius of boring B1. Soil samples collected from a depth of 7 feet bgs in these borings yielded benzene results that were non-detectable in all three locations. |
Grant Lidren |
| 3/20/2013 |
Document, Report, or Work plan Review - other |
On this date, ADEC recieved the Work Plan for Decommissioning of Groundwater Wells at Dean's Auto Salvage, 720 East Whitney Road, Anchorage, Alaska (ADEC File Number 2100.38.484)RSE Project Number: 13-1066. |
Grant Lidren |
| 3/29/2013 |
Update or Other Action |
On this date, ADEC recieved the Letter Report on Decommissioning of Groundwater Wells at Dean's Auto Salvage, 720 East Whitney Road, Anchorage, Alaska (ADEC File Number 2100.38.484)RSE Project Number: 13-1066. Both onsite MWs were decomisioned in accordance with ADEC MW guidance. |
Grant Lidren |
| 3/29/2013 |
Cleanup Complete Determination Issued |
The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, has completed a review of the environmental records associated with the Dean’s Auto Salvage Underground Injection Control Wells (UICs). Based on the information provided to date and the administrative record, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment. No further remedial action will be required as long as the site is in compliance with established institutional controls.
|
Grant Lidren |
| 3/29/2013 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Grant Lidren |
| 3/29/2013 |
Update or Other Action |
ADEC recieved a signed CC-IC agreement from the RP |
Grant Lidren |
| 4/24/2013 |
Update or Other Action |
ADEC recieved sighned CC-IC agreement from the landowner ARRC |
Grant Lidren |
| 8/6/2013 |
Institutional Control Compliance Review |
IC compliance review conducted and staff changed from Grant Lidren to IC Unit. Reminder system set-up to follow-up with the responsible party in 2018. |
Kristin Thompson |
| 5/10/2018 |
Institutional Control Compliance Review |
IC compliance review conducted. Closure/IC Details updated. There is a recent spill case for this site. ADEC project managers are being consulted on the proposed workplan. An ICs Verification letter was issued to the landowner this date. Reminder system set for future follow-ups to occur every five years. |
Kristin Thompson |
| 5/16/2018 |
Institutional Control Periodic Reporting |
The landowner reports there have been no changes at this site. |
Kristin Thompson |
| 5/22/2024 |
Institutional Control Compliance Review |
IC compliance review completed on this date. An IC reminder letter was e-mailed to the landowner. The next review will be in five years’ time. |
Gaige Robinson |
| 6/18/2024 |
Institutional Control Update |
The landowner responded to the IC reminder letter and provided a written confirmation that land use has not changed |
Gaige Robinson |
