| Action Date |
Action |
Description |
DEC Staff |
| 3/18/2009 |
Site Added to Database |
A new site has been added to the database |
Alyce Hughey |
| 3/18/2009 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST site created in CSP database for source area Retail Fuel Facility, 78738 |
Alyce Hughey |
| 3/18/2009 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 78738 name: Retail Fuel Facility |
Alyce Hughey |
| 9/21/2009 |
Document, Report, or Work plan Review - other |
Reviewed and approved the Work Plan for Post-UST Closure Release Investigation, from MWH, dated September 21, 2009. Work to be performed is five Confirmation Soil Borings (CSBs) will be drilled at approximately 15 feet bgs; four in the area of the former dispenser islands and one in the area of the former UST excavation. In August 2009, two 10,000-gallon USTs and the assocated fuel system were permanently closed (removed) at the site. ADEC awaiting the submission of the UST excavation report for review. The five CSBs will be completed into monitoring wells, CSB/MWH-1 through CSB/MWH-5. |
Paul Horwath |
| 11/16/2010 |
Meeting or Teleconference Held |
Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2011. |
Alyce Hughey |
| 11/16/2010 |
Meeting or Teleconference Held |
Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2011. |
Paul Horwath |
| 2/2/2011 |
Underground Storage Tank Site Characterization or Assessment |
Reviewed the September 2009 Release Investigation Report, dated December 2010, from MWH. During the September 2009 Release Investigation efforts to further evaluate the extent of hydrocarbon impacts identified during the August 2009 underground storage tank, dispenser island and associated piping removals, Xylene soil contamination was encountered in the subsurface at six feet below ground surface in the area of the former dispenser island. Five soil borings were drilled and constructed into monitoring wells (MWH-1 through MWH-5). Groundwater samples were taken from each monitoring well which detected Toluene, Xylenes and GRO below the groundwater cleanup levels. Additional groundwater monitoring and the evaluation of nearby private drinking water wells are being recommended. |
Alyce Hughey |
| 2/3/2011 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
Underground Storage Tank Closure Site Assessment performed August 17 through August 21, 2009. |
Alyce Hughey |
| 2/3/2011 |
Underground Storage Tank Site Characterization or Assessment |
Reviewed the August 2009 Underground Storage Tank Closure Site Assessment Report, dated December 2010, from MWH. On August 17 through August 21, 2009 two gasoline underground storage tanks (UST’s), dispenser islands and associated piping were removed. Approximately 112.7 tons of hazardous contaminated soil was transported off-site for treatment/disposal to Tacoma, Washington. The soil samples taken from the bottom and side walls of the UST’s excavation did not detect any of the contaminants of concern above the soil cleanup levels. The soil samples taken from the dispenser islands and associated piping excavations detected Benzene at 0.0604 mg/L and GRO at 1,159 mg/L at 6 feet below ground surface under dispenser #2. The groundwater sample taken from the groundwater depression in the UST excavation pit did not detect GRO or BTEX above the groundwater cleanup levels. The extent of groundwater contamination related to the dispenser island contamination is unknown at this time. The recommendation that a release investigation be performed in the fall of 2009, including the advancement of five soil borings constructed into monitoring wells to further characterize the extent of residual contamination at this site and the possible impact on the groundwater. |
Alyce Hughey |
| 4/20/2011 |
Document, Report, or Work plan Review - other |
Reviewed the February 2011 Monitoring Event Report, dated March 2011, from MWH. During the February 10, 2011 groundwater monitoring event only one well detected Toluene and Xylenes below the groundwater cleanup levels, with all other analytes and monitoring wells testing non-detect for all the analytes tested for. During the August 2009 Underground Storage Tank Closure, residual soil contamination remains beneath the former northwest dispenser. It is being recommended that the over excavation of the limited residual soil contamination in the area of the former northwest dispenser for the issuance of a Cleanup Complete Determination.
|
Alyce Hughey |
| 6/2/2011 |
Interim Removal Action Approved |
Approved the MWH's March 11, 2011, letter-Work Plan for Excavation of Contaminated Soil. Approved for the removal of the remaining contaminated soil beneath the former fuel dispenser island and temporarily storage of the contaminated soil on-site until the laboratory results indicate whether the soil is petroleum contaminated only (suitable for treatment at ASR in Anchorage) or whether the soil contains PCE contaminantes. If the soil is deemed RCRA waste then it will be hauled out of state for proper treatment. Amendments to the original work plan includes a minimum of two primary soil samples from the 'contaminated' excavated soil stockpile for PCE analyses, plus one field duplicate soil sample, and no need to replace groundwater monitoring well MWH-5 should it be damaged or removed during the contaminated soil excavation effort. |
Paul Horwath |
| 7/25/2011 |
Offsite Soil or Groundwater Disposal Approved |
Approved the offsite soil disposal of approximately 8 to 10 cubic yards of potentially contaminated soil to Alaska Soil Recycling, Inc. for thermal treatment and disposal. Following treatment at Alaska Soil Recycling, Inc., these soils require laboratory analysies for GRO (AK101) and BTEX (Method 8021B). |
Paul Horwath |
| 8/8/2011 |
Document, Report, or Work plan Review - other |
Reviewed the July 2011 Excavation Report, dated July 2011, from MWH. On July 14, 2011 approximately 40 cubic yards of soil was excavated from the former dispenser island location in efforts to remove the residual soil contamination beneath the former dispenser island. Approximately 30 cubic yards was found to be clean and was returned to the excavation. Eight to ten cubic yards was found to be petroleum contaminated and was transported to Alaska Soil Recycling for thermal remediation and disposal. Confirmation soil samples taken from the excavation at 7.5 feet bgs (above the groundwater), 11 feet bgs (excavation bottom) and the sidewalls at 8.5 feet bgs (north, south, east and west) did not detect any of the analytes above the soil cleanup levels, indicating that the remaining soil contamination had been successfully been removed from the subsurface in the area of the former dispenser island. |
Alyce Hughey |
| 8/9/2011 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78738 Retail Fuel Facility. |
Alyce Hughey |
| 8/22/2011 |
Update or Other Action |
Approved the Alaska Soil Recycling, August 17, 2011 request to co-mingle 9.82 tons of petroleum impacted soil from the Tesoro Northstore #56 site. |
Paul Horwath |
| 10/13/2011 |
Final Cleanup Report Reviewed |
Completed the review of the July 2011 Excavation Report, dated July 2011, prepared by MWH consultants. |
Paul Horwath |
| 10/17/2011 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78738 Retail Fuel Facility. |
Paul Horwath |
| 10/20/2011 |
Cleanup Complete Determination Issued |
Issued a Corrective Action Complete Determination letter. |
Paul Horwath |
| 10/20/2011 |
Institutional Control Record Removed |
Institutional Controls have been removed. |
Paul Horwath |
| 12/8/2011 |
Document, Report, or Work plan Review - other |
Reviewed the Monitoring Wells Decommissioning Report - Final, dated October 20, 2011, from MWH. The remaining four monitoring wells, MW-1 through MW-4, were decommissioned on August 24, 2011. |
Alyce Hughey |
