| Action Date |
Action |
Description |
DEC Staff |
| 8/17/1993 |
Site Added to Database |
|
Former Staff |
| 8/17/1993 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77759 ADD; |
Former Staff |
| 6/19/1996 |
Site Visit |
LFI; 8/17-19/93 13 soil borings were done and soil was analyzed for DRPH, GRPH, BTEX & TPH. Results indicated soils were impacted by DRPH, but not above DEC cleanup levels. |
Former Staff |
| 9/19/1996 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LCAU; 6/9-10/95 removed bad piping approx.145 ft.involving USTs 3,4,& 5 and approx.190 ft.involving USTs 1 & 2. Excavated approx. 20 cu. yds. contam. soil along piping. Landspread soils. Cut/cleaned/fill w/sand (3) 10000-gal USTs '95. Plan to do (2) in '96, Installed passive soil venting system. |
Former Staff |
| 9/19/1996 |
Release Investigation |
RELR; In-Ground Closure Site Assessment Report, dated 7/7/95, received 7/11/95. Re: 5-10,000 gallon USTs. Three done, two expected to be done in '96. Three areas of site exceed DEC cleanup levels. Piping/turbines installed for wind driven passive soil venting system. Approx. 20 cu. yds. contaminated soil landspread 2' thick & covered on site. |
Former Staff |
| 11/20/1997 |
Update or Other Action |
ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: YOUNGS PARTNERSHIP |
Former Staff |
| 1/25/1999 |
Update or Other Action |
ADEC gave a no further remedial action for the stockpiled soil on-site. |
Deborah Williams |
| 1/28/2004 |
Update or Other Action |
Transferred DEC staff lead from John Carnahan |
Cynthia Pring-Ham |
| 10/12/2006 |
Update or Other Action |
ADEC drafted a letter to RP requesting current data be collected on current residual soil concentrations remaining in the subsurface at the site. |
Deborah Williams |
| 3/20/2007 |
Exposure Tracking Model Ranking |
Initial ETM ranking complete |
Evonne Reese |
| 6/16/2008 |
Update or Other Action |
Sent letter to RP requesting current status of site and additional sampling on areas where contaminated soil was identified. |
Tamara Cardona-Marek |
| 2/19/2009 |
Update or Other Action |
Phone conversation with Dave Young from Youngs Chevron. Dave said that Shannon and Wilson had stopped by in Fall 2008 to monitor the passive vapor extraction system. An email was sent to S&W requesting details. |
Bill O'Connell |
| 6/17/2009 |
Document, Report, or Work plan Review - other |
Data received from drinking water samples collected from the onsite well. Samples were analyzed for VOCs by 524.2, and none were detected. |
Bill O'Connell |
| 5/4/2011 |
Update or Other Action |
File review: Concentrations of GRO and benzene above maximum allowable concentrations in soil indicate this site is not a candidate for closure. Additional assessment activites are required to delienate the nature and extent of soil contamination and evaluate migration to groundwater. |
Bill O'Connell |
| 2/21/2012 |
Update or Other Action |
Letter response from Young's Chevron regarding DEC letter dated 1/12/12. Dave Young indicated he plans to contact his consultant and draft a workplan to conduct the necessary characterization by May 30 |
Bill O'Connell |
| 4/25/2013 |
Meeting or Teleconference Held |
Teleconference with Responsible Party. Further investigation originally planned for 2012 was deferred until 2013. 2013 invistigation is in question due to funding and logisitical limitations. |
Bill O'Connell |
| 2/9/2015 |
Document, Report, or Work plan Review - other |
Reviewed Soil Characterization Report for former Young’s Chevron. 15 soil borings were advanced in an effort to define the horizontal and vertical extent of contamination at three areas where contamination remained, former Dispenser A, former Dispenser E, and a 90-degree pipe bend near former Tanks 3,4, and 5. Soil samples were collected at 5-foot intervals for field screening with two analytical samples from 13 of the boreholes submitted for laboratory analysis of GRO, DRO, and BTEX. One sample was also analyzed for PAHs. At former Dispenser A, boreholes 13, 14, and 15 were drilled to depths ranging from 25.5 to 50.5 feet bgs and soil samples were collected from various intervals between 11 and 50.5 feet bgs. Contaminants were not detected above cleanup levels in any of the samples. At former Dispenser E, boreholes 7, 8, 9, and 10 were drilled to depths ranging from 25.5 to 40.5 feet bgs and soil samples were collected from various intervals between 11 and 40.5 feet bgs. Benzene was detected above the migration to groundwater cleanup level in boreholes 7, 9, and 10 with a maximum detected concentration of 0.0592 mg/kg at 36 feet bgs in borehole 9. GRO and ethylbenzene were also detected above the cleanup level in this same sample. Benzene was detected as deep as 40.5 feet bgs in borehole 7 indicating the vertical extent of contamination was not defined in this area. At the 90-degree pipe bend, boreholes 3, 4, 5, 6, 11, and 12 were drilled to depths ranging from 16 to 31 feet bgs with samples collected from 6 to 31 feet bgs. Benzene was detected at 0.044 mg/kg in borehole 11 at 25.5 feet bgs however the sample from 31 feet bgs in this same borehole did not contain benzene above the cleanup level. Boreholes 1 and 2 were drilled near the foundation of the former gas station to evaluate for vapor intrusion. Soil samples collected from these boreholes contained DRO at 1,000 mg/kg in borehole 1 at 6.5 feet bgs, however no volatile contaminants were detected that might indicate a risk from vapor intrusion. A sample was also collected from the drinking water well that serves this building as well as the current Chevron. Contaminants were not detected in the drinking water sample. |
Bill O'Connell |
| 4/27/2015 |
Meeting or Teleconference Held |
Phone call with David Young to discuss data gaps from 2014 investigation and plans for 2015. |
Bill O'Connell |
| 5/27/2015 |
Document, Report, or Work plan Review - other |
Reviewed work plan for additional assessment at Young's Chevron. Five boreholes will be advanced and sampled to delineate the horizontal and vertical extent of contamination in areas where it was not delineated during the 2014 investigation: Former dispenser E, the 90-degree pipe bend, and near 2014 borehole T-01. |
Bill O'Connell |
| 7/21/2015 |
Document, Report, or Work plan Review - other |
Reviewed Additional Site Characterization Report for Young’s Chevron. The objective of the additional characterization was to delineate the extent of contamination noted most recently during the 2014 investigation. Activities included advancing and sampling 4 soil borings in areas of contamination noted during the previous investigations at the site. Analytical results indicated the vertical extent of contamination was successfully delineated in all areas except in borehole T17, located near former Dispenser E, which contained GRO at 807 mg/kg, benzene at 0.04 mg/kg, ethylbenzene at 9.75 mg/kg, and xylenes at 172.2 mg/kg. Each of these detections, with the exception of benzene, was flagged by the project laboratory as estimated. Contamination in borehole T17 was located at the groundwater interface at approximately 56 feet bgs, indicating the potential for groundwater contamination at the site. |
Bill O'Connell |
| 7/21/2015 |
Document, Report, or Work plan Review - other |
Reviewed Work Plan for monitoring well installation at the former Young’s Chevron. The work plan was submitted as an email due to the short turnaround time between submittal and mobilization of the drill rig to Tok. Four monitoring wells are proposed for installation: one in the source area near former dispenser E and one each to the south, northwest, and northeast of the source area. Wells will be developed and sampled 24 hours after installation and the samples will be analyzed for GRO, BTEX, and PAHs. Research indicates groundwater flow in the area is likely to the west or northwest. |
Bill O'Connell |
| 9/23/2015 |
Document, Report, or Work plan Review - other |
Reviewed Groundwater Monitoring Well Installation report for Young’s Chevron. Four soil borings were advanced and completed as monitoring wells MW-1 to MW-4 at the site. MW-3 was placed near former dispenser E, where benzene contaminated soil was in contact with groundwater approximately 56 feet below ground surface. The other three wells were placed a distance away from MW-3 in an effort to delineate the extent of groundwater contamination, if present. One soil sample was collected from each borehole near the groundwater interface and the wells were developed, purged, and sampled following installation. The soil sample collected at MW-3 contained benzene above the cleanup level at 0.0948 mg/kg. No other soil samples exceeded cleanup levels. Contaminants were detected in groundwater samples at MW-3 and MW-2, but at concentrations below Table C cleanup levels. |
Bill O'Connell |
| 8/16/2016 |
Document, Report, or Work plan Review - other |
Reviewed Additional Groundwater Monitoring Report for former Young’s Chevron, Groundwater samples were collected from the four monitoring wells at the site and analyzed for DRO, GRO, BTEX, and PAHs. Contaminants were not detected above 18 AAC 75 Table C cleanup levels. |
Bill O'Connell |
| 9/20/2016 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77759 USTs. |
Bill O'Connell |
| 9/28/2016 |
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 Chevron-Young’s Service contaminated site located at Mile 1314 of the Alaska Highway in Tok, 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 no further remedial action will be required unless new information becomes available that indicates residual contaminants may pose an unacceptable risk |
Bill O'Connell |
