| Action Date |
Action |
Description |
DEC Staff |
| 12/1/2011 |
Meeting or Teleconference Held |
Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2012. |
Paul Horwath |
| 1/9/2012 |
Document, Report, or Work plan Review - other |
Reviewed the 2011 Monitoring Wells Decommissioning Report, dated November 18, 2011, from MWH. On October 4, 2011 nine groundwater monitoring wells, an old seepage bed with associated observation wells were decommissioned. Monitoring wells decommissioned included MW-2, MW-5, MW-9, MW-13, MW-16, MW-18, MW-25, MW-27 and MW-28. The old seepage bed was decommissioned through access by the observation wells and filled with a mixture of grout mixed thin initially then after it settled Bentonite chips were added at a slow rate with additional grout to carry the chips to fill the void. After the old infiltrator trench was decommissioned the two observation wells OWE and OWW were decommissioned. All wells were decommissioned according the ADEC’s Monitoring Well Guidance, dated February 2009. |
Alyce Hughey |
| 6/6/2012 |
Meeting or Teleconference Held |
Staff attended the mid-year planning meeting at the ADEC office in Soldotna to discuss the Chemical Oxidation Treatment to be performed in 2012 at the Tesoro - Interior Fuel. |
Alyce Hughey |
| 11/14/2012 |
Meeting or Teleconference Held |
Paul Horwath and Alyce Hughey attended the annual planning meeting at MWH office in Anchorage to discuss the proposed Corrective Action Work Plan for 2013. |
Alyce Hughey |
| 5/7/2013 |
Document, Report, or Work plan Review - other |
Paul Horwath approved the March 25, 2013 Supplemental Work Plan for 2013 Site Assessment, prepared by MWH. MWH is proposing to perform a site assessment to evaluate the extent of remaining petroleum contamination on the south side of the interceptor trench located along the north property line. A total of five test holes will be excavated. Four on the south side of the interceptor trench, and one on the south side of the infiltrator trench. A minimum of two soil samples will be collected from each test hole and analyzed for DRO, GRO and BTEX. Following field work and receiving laboratory results, a report will be submitted to ADEC with results and recommendations. |
Alyce Hughey |
| 7/30/2013 |
Meeting or Teleconference Held |
Staff attended the mid-year planning meeting at the ADEC office in Soldotna to discuss the findings of the test pits and discussed options for future site work. |
Alyce Hughey |
| 8/9/2013 |
Document, Report, or Work plan Review - other |
Reviewed the May 2012 Monitoring Event Report, dated October 2012, prepared by MWH. On May 24, 2012, monitoring wells MW-4, MW-8, MW-14, MW-17 and IFC Aeration Tank were sampled. MW-3 was not sampled because free product was present with 0.50 inches of measureable product. Monitoring wells MW-8 and MW-14 contained 1.88 mg/L and 2.72 mg/L DRO respectively. The other wells sampled had concentrations testing either non-detected or below the groundwater cleanup levels. A total of 29-gallons of free product was removed from January 2012 until the May 24, 2012 sampling, with the majority of product recovered during the spring thaw. In August during an operation and maintenance, the aeration tank piping was reconfigured. This adjustment increased the dissolved oxygen concentration of the water in the treatment tank. |
Alyce Hughey |
| 11/22/2013 |
Site Characterization Report Approved |
Reviewed the July 2013 Site Assessment (Soils Investigation) report, dated October 24, 2013, prepared by MWH. On July 23, 2013 a total of four test pits were excavated at strategic locations along the up-gradient side of the Interceptor Trench to a depth that encountered the groundwater table, typically at 9 to 10 feet below ground surface. Three test pits were excavated on the Tesoro Northstore #101 property and one on the Interior Fuel Company property. Benzene was detected at 0.119 to 0.664 mg/kg, Toluene at 7.07 to 9.75 mg/kg, Ethylbenzene at 8.43 to 47.7 mg/kg, Xylenes at 83.7 to 353 mg/kg, GRO at 305 mg/kg to 3,130 mg/kg and DRO at 2,160 to 11,900 mg/kg at depths of 7.5 to 12 feet bgs. |
Alyce Hughey |
| 12/3/2013 |
Meeting or Teleconference Held |
Paul Horwath and Alyce Hughey attended the ADEC/Tesoro Annual planning meeting held at the MWH office in Anchorage to discuss the Corrective Action Plan for 2014, the July 2013 Site Assessment findings, product recovery and the current groundwater conditions. |
Alyce Hughey |
| 3/12/2015 |
Update or Other Action |
Database actions for this contaminated Leaking Underground Storage Tank (LUST) site are being tracked under the Tesoro-Discount Truck Stop #101 LUST site (ADEC Event ID #1098, Hazard ID #23946). The administrative records are located in ADEC Office File Number 100.26.022. |
Mitzi Read |
