Action Date |
Action |
Description |
DEC Staff |
1/8/1998 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77634 |
Former Staff |
1/8/1998 |
Site Added to Database |
|
Former Staff |
10/11/1999 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
|
Former Staff |
12/1/2003 |
Update or Other Action |
Four Groundwater monitoring wells were installed , developed and sampled December 2003. Quarterly GW montioring events scheduled. Excavation scheduled for May 04. |
David Allen |
12/1/2003 |
Update or Other Action |
A conditional approval letter was sent by Monica English from the Groundwater Monitoring Plan received October 23, 2003. |
Alyce Hughey |
6/1/2004 |
Leaking Underground Storage Tank Corrective Action Underway |
Staff reviewed and provided comments to a Soil Remediation work plan and a Thermal Operations Plan. Review comments letter sent by Paul Horwath. |
Monica English |
6/9/2004 |
Update or Other Action |
File number assigned and entered into the Fileroom DB and LUST DB. |
Alyce Hughey |
6/23/2004 |
Leaking Underground Storage Tank Corrective Action Underway |
Conditional approval letter sent by Monica English for soil remediation work plan. |
Monica English |
7/24/2004 |
Update or Other Action |
Requested Public Notice for Soil Remediation and Thermal Operations |
David Allen |
2/14/2005 |
Document, Report, or Work plan Review - other |
December 30, 2004 Shannon & Wilson report indicated 1120 cubic yards of soil was thermally treated on site. There was a slight exceedance of benzene above cleanup levels in one sample of post treated soil. The groundwater monitoring indicated B1MW and B3MW had detectable concentrations of petroleum (whereas B2MW and B4MW did not). Benzene was the contaminant of concern and was only detected in B3MW during the last event (October 2004). There appears to be a decreasing trend in contaminatioin and continued monitoring is recommended until Table C levels are met. An on-site drinking water well and an adjacent private well were sampled but were reported to be clean. Treated soil is proposed to be used on site. NFRAP status may be appropriate now and closure should be considered when groundwater cleanup levels are achieved. |
Jim Frechione |
7/6/2005 |
Conditional Closure Approved |
File & reports reviewed. Current site conditions are protective of human health and the environment. Treated soils may be used on-site as base material for grading. They may not be removed off site without ADEC written approval. Natural attenuation will further degrade in-situ soils with residual contaminant concentrations exceeding ADEC cleanup levels. Analytical data showing contaminant levels are below ADEC soil and groundwater cleanup levels are required for site closure. GW monitoring program to continue on an annual basis until two consecutive sampling events show all GW sampling points are below cleanup levels. Soil and GW contaminant levels must all be below cleanup levels for site closure. |
Donald Seagren |
7/6/2005 |
Institutional Control Record Established |
|
Former Staff |
11/29/2005 |
Update or Other Action |
Using Figure 1 from a Water Sampling and Soil Remediation, ADOT&PF Ninilchik Maintenance Station, from Shannon & Wilson, dated December 30, 2004, in conjunction with TopoZone Pro and the KPB Parcel Lookup, entered the coordinates for this site. Metadata includes No Topo Basemap, TopoZone Pro Street Maps, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinated Datum NAD83. High degree of confidence in accuracy of location. |
Alyce Hughey |
2/16/2006 |
Update or Other Action |
Reviewed and approved S&W work GW monitoring work plan. Monitoring event tentatively scheduled for May 06. |
Donald Seagren |
2/14/2007 |
Exposure Tracking Model Ranking |
|
Former Staff |
7/5/2007 |
Document, Report, or Work plan Review - other |
Reviewed monitoring report. B1MW contained benzene exceeding groundwater cleanup levels. Possible cross-contamination due to benzene being detected in MW and DW at low levels for the first time. Pending funding approval, wells will be sampled again to determine benzene concentrations. Annual monitoring will continue. |
Donald Seagren |
6/17/2008 |
Update or Other Action |
Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. |
Alyce Hughey |
12/28/2010 |
Document, Report, or Work plan Review - other |
Term contractor SLR's 2010 Ground Water Monitoring Report for this site, dated September 2010 was reviewed. Only GW MW B4MW was sampled and no contamination was detected in the July 2010 sampling event.
Monitoring wells B1MW and B3MW were the only MWs that ever exceeded ADEC GW cleanup levels at this site. These two MWs were found to be covered with asphalt paving during the 2010 GW sampling event performed by ADEC term contractor SLR. These MWs were last sampled in 2006 and only B1MW exceeded cleanup levels at that time, at 13 ug/L benzene. The groundwater likely meets ADEC GW cleanup levels at this time, however MWs B1MW and B3MW may never be sampled again due to damage or the inability to locate them at the facility, since they are now covered with asphalt pavement.
This site should be considered for site closure without the need for ICs or any further GW quality monitoring. The remaining GW MWs will need to be properly decommissioned. |
Paul Horwath |
12/29/2010 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77634 USTs. |
Paul Horwath |
10/12/2011 |
Long Term Monitoring Complete |
No further soil or groundwater sampling is planned at this site at this time. Any residual contamination will continue to degrade over time, and is very unlikely to pose any unacceptable risk to any future use of the property.
To reiterate the final work task associated with this project site; An ADEC Term Contractor should now be hired to locate and properly decommission the 4 groundwater monitoring wells present at this site. Two of these four monitoring wells (B1MW and B3MW) are now reportedly covered with asphalt pavement. If horizontal survey coordinates are unavailable for these two MWs, we may not be able to excavate, locate, and properly decommission these two wells. |
Paul Horwath |
10/12/2011 |
Institutional Control Record Removed |
A State term contractor should now be hired to locate properly decommission the 4 groundwater monitoring wells present at this site. Two of the monitoring wells (B1MW and B3MW) are now reportedly covered with asphalt pavement. If survey coordinates are not available for these two MWs, we may not be able to excavate, locate, and properly decommission these two wells. |
Paul Horwath |
4/3/2012 |
Update or Other Action |
A term contractor should be hired to properly decommission the groundwater monitoring wells. |
Paul Horwath |
4/3/2012 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77634 USTs. |
Paul Horwath |
6/25/2014 |
Document, Report, or Work plan Review - other |
Paul Horwath approved the Shannon & Wilson's June 9, 2014, Work Plan for Groundwater Monitoring Well Decommissioning for the ADOT&PF Ninilchik site. |
Alyce Hughey |
12/10/2014 |
Update or Other Action |
All groundwater monitoring wells that could be located were decommissioned under the oversight of ADEC term contractor Shannon & Wilson in July, 2014. |
Paul Horwath |