| Action Date |
Action |
Description |
DEC Staff |
| 9/1/1989 |
Underground Storage Tank Site Characterization or Assessment |
REM; Shannon & Wilson performed testing and sampling during UST removal operations in September 1989. Analysis of soil samples from limits of exxcavation found up to 145 ppm TPH and 60 ppm sum of BTEX. Contamination possibly present beyond east and west limits of the excavation and a few feet below the excavation base. |
Former Staff |
| 9/1/1989 |
Cleanup Plan Approved |
|
Paul Horwath |
| 10/19/1989 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77879 ADD; |
Former Staff |
| 10/19/1989 |
Site Added to Database |
|
Former Staff |
| 10/20/1989 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LCAU; Thomas reported: UST removal resulted in the discovery of significant soil and gw contamination. 1600 yards were removed to an off-site facility. A comprehensive bioremediation injection program (PES-131) was installed and in operation in 1992. : LCAU date changed DB conversion |
Former Staff |
| 10/20/1989 |
Offsite Soil or Groundwater Disposal Approved |
|
Paul Horwath |
| 10/1/1991 |
Site Characterization Workplan Approved |
|
Paul Horwath |
| 4/16/1992 |
Leaking Underground Storage Tank Corrective Action Underway |
CAPR; Reviewed "Corrective Action Plan" |
Former Staff |
| 5/22/1992 |
Update or Other Action |
UPD; Staff changed from Timmons to Basketfield. |
Former Staff |
| 8/4/1992 |
Leaking Underground Storage Tank Corrective Action Underway |
CAPR; Basketfield reviewed. |
Former Staff |
| 10/16/1992 |
Leaking Underground Storage Tank Corrective Action Underway |
CAPR; Basketfield reviewed hydraulic plan. |
Former Staff |
| 1/14/1994 |
Update or Other Action |
RPL2; Peterson sent PRP-CS Database Noitification Letter to RP requesting update and more environmental information concerning the contaminated site. As of this "complete date" no response has been received. |
Former Staff |
| 6/6/1994 |
Update or Other Action |
CORR; Wingerter sent letter informing RP of their financial liability under new ADEC cost recovery policy. State is authorized, under Section 9003(h) of the Resource Conservation and Recovery Act to take action on this LUST facility. |
Former Staff |
| 1/20/1995 |
Update or Other Action |
UPD; SITE SUMMARY: Site has history of treatment activities including soil removal and treatment, bio-injection, AS/SVE, and long term monitoring. Risk assessment submitted in late 1993. RA rejected for failure to assess impact to Rescue Mission. Tesoro will submit RA addendum for review. DEC developing Request for Proposal for a Term Contract to independently evaluate the RA and addendum. Tesoro will pre-pay NRO for contract. DEC needs to finalize RFP once addendum and payment are received. |
Former Staff |
| 3/15/1996 |
Risk Assessment |
RISK; Risk assessment submitted by Tesoro currently being reviewed by ADEC and its term contractor, Shannon & Wilson. |
Former Staff |
| 11/20/1997 |
Update or Other Action |
ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TESORO NORTHSTORE |
Former Staff |
| 1/28/2004 |
Update or Other Action |
Transferred DEC staff lead from John Carnahan |
Cynthia Pring-Ham |
| 10/9/2006 |
Update or Other Action |
Project manager changed from Monica English to Paul Horwath, per Paul Horwath. |
Alyce Hughey |
| 2/20/2007 |
Document, Report, or Work plan Review - other |
Reveiwed MWH's Former Tesoro Norhtstore #105, July 2006 Monitoring Event Report Final, dated December 2006. Three onsite GW monitoring wells were sampled and the VSC groundwater treatment system was started backup. Groundwater contamination in excess of ADEC groundwater cleanup levels was detected in two of the three GW MWs. GW concentrations are diminishing since GW treatment efforts began in 2003. P.Horwath |
Paul Horwath |
| 10/11/2007 |
Document, Report, or Work plan Review - other |
ADEC reviewed MWH's March 2007 Monitoring Event Report Final dated May 2007. Two monitoring wells were sampled. Contaminated concentrations increased in one MW and decreased in another. Contaminant concentrations are generally decreasing over time. An SVE and Vapor Stripping Circulation treatment system has been operated at the site since 2003. |
Paul Horwath |
| 10/11/2007 |
Exposure Tracking Model Ranking |
Initial ETM site ranking completed. |
Paul Horwath |
| 5/5/2008 |
Document, Report, or Work plan Review - other |
Reviewed MWH's September 2007 Monitoring Event Report Final, dated March 2008. SVE, VSC groundwater treatment continues at this site. No contamination was detected in the MWs sampled this event, however GRO and BTEX contamination have been recently detected. Treatment will continue with continued water quality monitoring. A declining trend has been confirmed during the past 17 years of GW sampling at this site. |
Paul Horwath |
| 9/30/2008 |
Document, Report, or Work plan Review - other |
Reviewed the April 2008 Monitoring Event Report, dated July 2008, from MWH for Paul Horwath and provided a summary for his review. Site conditions continue to improve. Residual concentrations of GRO and BTEX above the practical quantitation limit, but below the ADEC groundwater cleanup levels was found in MW-2. The effectiveness of the VSC system was improved by the installation of solenoid actuators that automatically alternate air flow between the two VSC wells were installed. The installation was necessary in order to provide ample time for the groundwater to recover within the in-take well of the treatment system. |
Alyce Hughey |
| 10/24/2008 |
Document, Report, or Work plan Review - other |
Reviewed the September 2007 Monitoring Event Report, (Revised), and the April 2008 Monitoring Event Report, (Revised) dated October 2008. The corrections for the GW gradient and flow direction was corrected on Figure 2 and within the text. |
Alyce Hughey |
| 12/16/2008 |
Update or Other Action |
Reviewed the September 2008 Monitoring Event Report, dated November 2008, from MWH for Paul Horwath and provided him a summary of the review. Site conditions continue to improve. The installation of the solenoid valve has shown to be successful in remediating the groundwater concentrations. All three monitoring wells tested during this monitoring event tested undetected for all the analytes. |
Alyce Hughey |
| 5/12/2009 |
Document, Report, or Work plan Review - other |
Reviewed the February 2009 Monitoring Event Report, dated April 2009, from MWH for Paul Horwath and prepared a summary for his review and oversight. For the April 2009 monitoring event there has been an increase in groundwater concentrations during this monitoring event since the September 2008 monitoring event from undetected concentrations to detectable concentrations with one well showing Benzene and GRO above the groundwater cleanup levels. The Vapor Stripping and Circulation well blower was not operating during the February 24, 2009 monitroing event. A new compressor is planned on being installed during the April 2009 site visit, and at that time the system will be placed back into operation. |
Alyce Hughey |
| 12/15/2009 |
Document, Report, or Work plan Review - other |
Reviewed the July 2009 Monitoring Event Report, dated November 2009, from MWH for Paul Horwath. For the July 2009 monitoring event there has been a decrease in two of the three monitoring wells tested. Only one monitoring well showed an increase in Benzene concentrations that remain below the groundwater cleanup levels. A new Vapor Stripping and Circulation compressor was replaced during the April 2009 operations and maintenance for the site. The site will be evaluated during 2010 as a potential candidate for closure, based on the groundwater sampling events performed in 2010. |
Alyce Hughey |
| 7/6/2010 |
Document, Report, or Work plan Review - other |
Reviewed the results for an additional sampling event for Sulfolane, conducted on June 15th and 16th, 2010 from MW-2 located on the site. Sample results are non-detect for Sulfolane from MW-2. |
Alyce Hughey |
| 7/7/2010 |
Document, Report, or Work plan Review - other |
Reviewed the March 2010 Monitoring Event Report, dated May 2010, from MWH for Paul Horwath. During the March 2010 groundwater monitoring event only one monitoring well showed an increase in Benzene concentrations that remain below the groundwater cleanup levels. The groundwater treatment system was turned off in November of 2009 due to power-related issues, and turned back on in March of 2010 following the installation of a new compressor. With the treatment system not operating during the winter months, the groundwater contaminant concentrations remain low. After the 2010 groundwater sampling events, the site may be considered for closure depending on the sampling results. |
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. |
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 |
| 12/15/2010 |
Document, Report, or Work plan Review - other |
Reviewed the September 2010 Monitoring Event Report, from MWH, dated October 2010. During the September 14, 2010 groundwater monitoring event, one of the monitoring wells is now yielding benzene concentrations slightly above the groundwater cleanup levels. Not since 2005 has this MW detected benzene above the groundwater cleanup levels. One of the wells remained undetected for all the analytes tested and one well is detecting BETX and GRO below the groundwater cleanup levels. |
Alyce Hughey |
| 6/30/2011 |
Document, Report, or Work plan Review - other |
Reviewed the March 2011 Monitoring Event Report, dated June 2011, from MWH. During the March 23, 2011 groundwater monitoring event the three monitoring wells tested are now below the groundwater cleanup levels. The Soil Vapor Extraction System has not been operating on a consistent basis, and it was determined that the system quickly accumulates water and automatically turns off. The Soil Vapor Extraction System is scheduled for repairs in the summer of 2011. |
Alyce Hughey |
| 12/1/2011 |
Meeting or Teleconference Held |
Staff attended the annual environmental planning meeting with Tesoro and MWH to discuss the workplans for 2012. |
Alyce Hughey |
| 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 September 2011 Monitoring Event Report, dated December 2011, from MWH. The second groundwater monitoring event conducted in 2011 was performed on September 1, 2011 and October 5, 2011. The groundwater quality in the three sampled wells continues to remain below the groundwater cleanup levels. The Vapor Stripping and Circulation system was shut off on October 19, 2011, and the repair of the Soil Vapor Extraction system was postponed to begin a rebound test that will be performed in 2012. |
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 proposal for Corrective Action Complete determination for Tesoro Northstore #105. |
Alyce Hughey |
| 8/29/2012 |
Conceptual Site Model Submitted |
Conceptual Site Model evaluated in the Summary Report and Request for Cleanup Complete with Institutional Controls report dated May 25, 2012. |
Paul Horwath |
| 9/5/2012 |
Final Cleanup Report Reviewed |
Reviewed the May 2012 Monitoring Event and Rebound Test Report, dated August 2012, prepared by MWH. The groundwater monitoring event and rebound test was conducted on May 23rd and 24th of 2012. The groundwater sample results detected benzene at 0.00667 mg/L in one monitoring well located on site within the area of the former USTs excavation. The Vapor Stripping and Circulation system was shut off on October 19, 2011 to begin a rebound test. On May 23, 2012 the systems were restarted and soil vapor extraction exhaust samples were collected at one hour and twenty-four hours. Analytical results did not detect either BTEX or GRO in the system exhaust. |
Alyce Hughey |
| 9/5/2012 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77879 Former USTs. |
Alyce Hughey |
| 9/18/2012 |
Long Term Monitoring Complete |
Long Term Monitoring is complete. The monitoring wells will be decommissioned. |
Alyce Hughey |
| 9/18/2012 |
Cleanup Complete Determination Issued |
Issued a Corrective Action Complete Determination Letter. Following the completion of remedial action performed at this site from 1997 to 2011, residual soil contamination remains in the subsurface soil exceeding the ADEC's Method Two 'Migration to Groundwater' soil cleanup levels at depths exceeding 12 feet below ground surface in the area of the former underground storage tanks located within the southern portion of the property boundaries. Any proposal to excavate, transport, move, treat, and/or dispose of residual contaminated soil in this area requires prior ADEC approval. Groundwater concentrations have consistently tested below the groundwater cleanup levels since 2010; with the exception that one groundwater sample collected in May of 2012 had a reported benzene concentration of 0.00667 mg/L. The affected groundwater is not currently used as a drinking water source, and the site is serviced by the local public water and sewer systems. Water wells may not be installed on this property without the prior notification, and approval, of ADEC. |
Paul Horwath |
| 9/19/2012 |
Document, Report, or Work plan Review - other |
Paul Horwath conditionally approved the Decommissiioning Work Plan for 2012, Former Tesoro Northstore #105, dated September 18, 2012, prepared by MWH with the following conditions:1)Our understanding and interpretation of this work plan is that a bentonite grout slurry will be used to fill the voids left during removal of the MW casings, and to pressure grout any piping associated with SVE/AS wells and subsurface delivery piping to be left in the subsurface. The use of bentonite chips or non-grout should only be substituted with our prior approval. Some drilling contractors are expressing their preference to use dry bentonite chips or pellets, but the drilling contractor shall not be allowed to take control of this field work and substitute dry/solid bentonite chips or pellets without prior ADEC approval.
2)Following the completion of this work, a written report documenting the implementation and completion of these approved work tasks shall be prepared and provided to our office, complete with the signature of the “qualified person” responsible for observing and documenting the field work.
|
Alyce Hughey |
| 9/20/2012 |
Institutional Control Record Removed |
Institutional Controls have been removed. |
Paul Horwath |
| 11/14/2012 |
Meeting or Teleconference Held |
Paul Horwath and Alyce Hughey attended the annual planning meeting at MWH in Anchorage to discuss the decommissioning activities conducted in 2012. |
Alyce Hughey |
