| Action Date |
Action |
Description |
DEC Staff |
| 7/31/2007 |
Spill Transferred from Prevention Preparedness and Response Program |
Site transferred by PERP staff Tom DeRuyter. Spill No. 06309933102; Spill Date = 11/27/06; Substance = Diesel #2; Quantity = 468 gallons; PERP File No. 100.02.295. |
Mitzi Read |
| 8/2/2007 |
Exposure Tracking Model Ranking |
Initial ranking completed. |
Mitzi Read |
| 8/2/2007 |
Site Added to Database |
Site added to the database. |
Mitzi Read |
| 8/8/2007 |
Update or Other Action |
Staff reviewed the file. Approximately 250 gallons of fuel was recovered during initial recovery efforts. A culvert was installed near the drinking water well to attempt further recovery. A holding tank was installed to replace the well so nobody is drinking the water. There is some question about groundwater flow in the area, but the Chena river is to the west of the property. A well search still needs to be completed. It was #2 diesel and the spill occurred at 35 feet bgs. Badger Fuel also removed the vadose zone soil that was impacted so vapor intrusion should not be a significant concern, although all the details on the house construction are not known. There is some indication that Nortech was hired to do additional work so staff will follow up with them and Badger Fuel. |
Ann Farris |
| 8/8/2007 |
Update or Other Action |
Staff contacted Nortech, the consultant for Badger Fuel. They indicated an additional set of groundwater sampling occurred in July 2007. Once the results are received from that event, they will write a work plan for completing the site characterization and submit to DEC for approval. |
Ann Farris |
| 10/10/2007 |
Update or Other Action |
DEC received a report entitled, "Summer 2007 Groundwater Sampling and Monitoring Update, 578 Canoro Rd, North Pole, Alaska" from Nortech Engineering. Seven monitoring wells were installed: 5 shallow (screened from 12-17') and 2 deep (screened 25-35'). These wells were sampled in February and July 2007. The former drinking water well, which remains disconnected, was also sampled in July. The wells on the east side of the house, SW-5 (shallow), DW-2 (deep), and the former drinking water well (35' deep) had fuel concentrations above the DEC cleanup levels in both Feb and July.
The remaining wells (SW-1, 2, 3, 4, and DW-1), located on the north, west, and southwest of the house had essentially no detects in February. In July, SW-1, located in the southwest edge of the lot, had 9.8 µg/L benzene, which is above the cleanup level of 5 µg/L. The remaining analytes were below the cleanup levels.
Several gallons of free product were recovered from SW-5 in 2007. The recovery well installed at the release point has not yielded anymore fuel after the initial recovery efforts in Nov and Dec. 2006.
|
Ann Farris |
| 10/15/2007 |
Site Characterization Workplan Approved |
On October 10, 2007, DEC received a "Work Plan for Additional Aquifer Characterization based on Interim Characterization Recommendations" from Nortech Engineering. Staff commented on and approved the work plan. The work to be completed between October 2007 and July 2008 includes:
1.Fourteen site visits to attempt product recovery at the recovery well culvert and SW-5. A larger well will be installed near SW-5 to facilitate recovery efforts.
2.A well search to identify and, if appropriate, sample drinking water wells within the area.
3.A geophysical survey of the site to better understand the hydrogeology of the site. The investigative tools will include ground penetrating radar, electromagnetic survey, and confirmation soil borings. The goal is to explain the apparent movement of free-phase fuel to the east, despite a groundwater gradient to the west, southwest. The information will be used to site a location for a new drinking water well for the house and to focus monitoring and remediation efforts.
4.Install 3 new monitoring wells.
|
Ann Farris |
| 12/7/2007 |
Update or Other Action |
Staff was contacted by a concerned neighbor living on Orion Road, approximately 600 to 800 feet downgradient of the subject property. She indicated that she has a drinking water well (54’ deep), their neighbors to the north have a well and a property directly west of the subject property has a shallow well.
Based on this report, staff contacted Nortech for the current status of the site. The geophysical survey has been completed and they are in the preliminary phases of evaluating that data. It does appear that there is a layer of gravel at 25 to 35 feet that slopes to the east which may explain the fuel migration to the east. They completed 10 soil borings across the site and are prepared to locate the new drinking water well to the north of the house.
The well search has not been completed yet and the 3 new monitoring wells have not been installed yet. The wells will be located based on the results of the soil data and the increasing benzene concentrations in SW-1 at the southwest edge of the property.
Staff informed Nortech of the drinking water wells in the area. We agreed that the well search should be completed as soon as possible along with sampling of nearby wells. The Nortech project manager indicated he would begin the well search and contact landowners for permission to sample their wells.
|
Ann Farris |
| 12/11/2007 |
Update or Other Action |
ADEC sent Informational letters to the landowners around the subject property. Nortech will follow up on these letters to complete the well search. |
Ann Farris |
| 6/10/2008 |
Update or Other Action |
A well search was completed and 11 drinking water wells were identified, including the new drinking well installed in November 2007 on the source property. The 6 wells that were down- or cross-gradient of the spill and the well onsite were sampled on January 11, 2008 for BTEX compounds by 524.2. All the results were non detect, except two low-level detections of toluene at 0.0008 and 0.0024 mg/L that are several orders of magnitude less than the cleanup level of 1.0 mg/L. Also these detections are not believed to be from the spill as they do not match the patterns of contaminant transport observed at the site. All of the drinking water wells, except one, are 40 to 60 feet in depth. The one exception is immediately downgradient (west) of the source property and has a depth of 20 to 30 feet. |
Ann Farris |
| 6/10/2008 |
Update or Other Action |
DEC received a letter report from Nortech regarding the results of work completed at the site in October 2007 to February 2008. This work included the drinking water well search and sampling as well as a geophysical investigation with ground penetrating radar and electrical conductivity, confirmed by 10 direct push soil borings. The work was used to identify a location for the new drinking water well on site and to better understand the hydrogeology of the site. The results indicate soil contamination and free-phase product beneath the water table at 20-35 feet located to the east and northeast of the house, covering approximately an area 30' by 90'. Product appears to be flowing upward to the top of the water table at SW5, which is northeast of the spill location, while groundwater is generally flowing to the west. Nortech plans to install a product recovery well near SW-5, 4 new monitoring wells at hydraulically downgradient locations, continue product recovery efforts, and continue to monitor the drinking water well for one year. The monitoring wells will be sampled at a high and low water table event. The results of these activities will be completed by late 2008 and a report will be submitted by January 2009. |
Ann Farris |
| 12/1/2010 |
Document, Report, or Work plan Review - other |
Work plan for groundwater and drinking water sampling for 2010 submitted by Nortech. Staff reviewed and commented. sampling is to occur in Dec 2010 and a letter report should be out in January 2011 along with another work plan for 2011 activities. Set this up in task tracker. Concentrations appear stable or descreasing and our generally low except in the source area. Benzene and DRO remain the primary COCs. There appears to be no more mobile product for active recovery, but monitoring needs to continue. |
Ann Farris |
| 3/20/2013 |
Update or Other Action |
Approved Spring 2013 sample event as proposed by Nortech. |
Willett Boger |
| 5/28/2013 |
Update or Other Action |
Report for the March 2013 groundwater sampling event received from Nortech. |
Willett Boger |
| 6/25/2015 |
Update or Other Action |
ADEC discussed site with Nortech. Nortech plans to submit workplan for additional field work this summer. |
Willett Boger |
| 5/2/2016 |
Update or Other Action |
Site transferred to new Project Manager. |
Laura Jacobs |
| 4/20/2017 |
Document, Report, or Work plan Review - other |
DEC reviewed the work plan "2017 Assessment Activities 578 Canoro Road, North Pole, Alaska". Samples will be taken from the groundwater monitoring wells, indoor air quality and the water supply well for the residence. The sample event is proposed for the late winter. |
Laura Jacobs |
| 6/4/2018 |
Document, Report, or Work plan Review - other |
DEC staff received 2017 Groundwater and Indoor Air Monitoring Report. |
Laura Jacobs |
| 8/23/2018 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75428 Residential Well - Diesel #2. |
Laura Jacobs |
| 9/4/2018 |
Document, Report, or Work plan Review - other |
ADEC staff has reviewed the report "2017 Groundwater Monitoring and IAQ Assessment, 578 Canoro Road, North Pole, Alaska" and issued review comments. The RP's Qualified Environmental Professional has requested closure. ADEC recommends one of the following approaches to reach site closure: meet all requirements of the ADEC closure memorandum, or demonstrate groundwater meets cleanup levels throughout the site by installing a temporary well point in the area of SW5 where contaminant levels remain above clean up levels. |
Laura Jacobs |
| 11/1/2018 |
Document, Report, or Work plan Review - other |
ADEC staff reviewed the work plan submitted by Nortech staff on October 31, 2018 for the decommissioning of all site wells, installation of a temporary well point and groundwater sample collection at this well. Approval was sent to the insurer, Markel Underwriting. |
Laura Jacobs |
| 12/4/2020 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75428 Residential Well - Diesel #2. |
Laura Jacobs |
| 12/7/2020 |
Cleanup Complete Determination Issued |
Since the injection of fuel oil into the drinking water well in 2006, soils around the well have been excavated. Contamination in the groundwater has been characterized in the twelve years of study (2006-2018). Since the 2011 sample event SW5 has remained the only well that had contaminants above ADEC cleanup levels. In 2018, a temporary well was installed 2.5 feet from SW5 to evaluate groundwater conditions in this area. Collected samples were analyzed for diesel range organics, benzene, toluene, ethylbenzene, and xylenes with results that were non-detect for all contaminants of concern. Based on a review of the environmental record, ADEC has determined that residual contaminant concentrations meet the human health cumulative risk criteria for residential land use. |
Laura Jacobs |
| 12/8/2020 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Laura Jacobs |
