| Action Date |
Action |
Description |
DEC Staff |
| 9/20/1993 |
Site Added to Database |
|
Former Staff |
| 9/20/1993 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77748 ADD; |
Former Staff |
| 9/22/1993 |
Update or Other Action |
NOR; New site; contamination was encountered at site by survey commissioned by ADOT&PF in July 1989. NORL sent by Kent Patrick-Riley. |
Former Staff |
| 8/15/1994 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LCAU; LUST corrective action underway. |
Former Staff |
| 8/15/1994 |
Underground Storage Tank Site Characterization or Assessment |
Completed the UST closure characterization and began the assessment work at the time of the UST removals. |
Paul Horwath |
| 5/1/1996 |
Leaking Underground Storage Tank Corrective Action Underway |
CAPA; Reviewed and approved a remedial action plan for sampling of contaminated soil stockpiles. |
Former Staff |
| 11/20/1997 |
Update or Other Action |
ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: WALTER DONAT |
Former Staff |
| 12/10/1997 |
Update or Other Action |
Returned Letter. Wrong Address. Sent email to Horwath. Saw it was grant recipient.; ; |
Former Staff |
| 8/12/2002 |
Update or Other Action |
Reviewed 18 AAC 75.350 determination. Discussed site with LUST staff and Geo Engineeers. Developed draft Public Notice for alternative cleanup levels. |
Donald Seagren |
| 11/18/2002 |
Update or Other Action |
Discuss and approve final public notice for 10X rules. |
Donald Seagren |
| 1/27/2003 |
Update or Other Action |
File/report review to begin development of Record of Decision approving ACL's for soil & GW based on 10 X rule & GW not a drinking water source. |
Donald Seagren |
| 1/29/2003 |
Update or Other Action |
Develop draft Record of Decision for use of ACL's based on 10X Rule that the GW is not a drinking water source. Discuss with GeoEngineers to get additional data. |
Donald Seagren |
| 2/4/2003 |
Cleanup Level(s) Approved |
Record of Decision approving use of alternate cleanup levels for soil and groundwater signed. Decision based on 18 AAC 75.350 - 10X Rule - groundwater not a drinking water source. |
Donald Seagren |
| 2/6/2003 |
Document, Report, or Work plan Review - other |
Reviewed Summary Report for Ground water Monaitoring and Sampling 5 February 03. All levels below ACL's approved on 4 February 03. |
Donald Seagren |
| 5/5/2003 |
Long Term Monitoring Established |
Reviewed and approved LTM plan. |
Donald Seagren |
| 7/18/2003 |
Document, Report, or Work plan Review - other |
Reviewed LTM report for 3 June 03 sampling event. MW 2 is the only MW with Method 2 exceedances for GRO and Benzene. GRO did not exceed ACLs for site. |
Donald Seagren |
| 12/30/2003 |
Document, Report, or Work plan Review - other |
Reviewed Summary Report for Long Term Monitoring Activities, 23 December 03 |
Donald Seagren |
| 1/16/2004 |
Long Term Monitoring Established |
Upno review of request and discussion with GeoEngineers, abandonment of selected MW's approved once MWs are re-surveyed and GW flow re-calculated. |
Donald Seagren |
| 5/4/2004 |
Update or Other Action |
Contact Project Manager chaneged to Robert G. Shipley, Jr., Unocal Alaska, Union Oil Company of California. |
Alyce Hughey |
| 9/1/2004 |
Long Term Monitoring Established |
Discussed MW abandonment with Scott Thorsell of Unocal. He will also double check GW flow direction in remaining MWs to ensure that we have downgradient MWs in place. A work plan will be submitted for installation of down-gradient MW if necessary. |
Donald Seagren |
| 9/7/2004 |
Long Term Monitoring Established |
Reviewed data summary and change in GW flow. Discussed with Scott Thorsell, Unocal. Requested additional monitor well be installed North of UMW-5 along opposite property lineto ensure downgradient flow monitoring. |
Donald Seagren |
| 10/5/2004 |
Update or Other Action |
Discussed new MW survey data confirming GW flow direction with Scott Thorsell. Finalized plans for MW abandonment and installation of new MW. Approved MW sampling now instead of December since consultant is on site. |
Donald Seagren |
| 10/11/2004 |
Update or Other Action |
Reviewed latest MW survey data. Corrected which MW's were to be abandoned and which were to remain. |
Donald Seagren |
| 12/14/2004 |
Update or Other Action |
File number 2601.26.042 assigned and entered into the Fileroom database and Leaking Underground Storage Tank database. |
Alyce Hughey |
| 1/3/2005 |
Long Term Monitoring Established |
Reviewed Well Installations, Abandonment and Sampling Report dated 29 December 04. Slightly elevated concentrations of benzene are still present in UMW-2, located in the original source area. The concentration is considerably lower than previous sampling events and shows a continued reduction iof petroleum contamination at the source area. All other monitor wells were below ADEC cleanup standards. |
Donald Seagren |
| 12/5/2005 |
Update or Other Action |
Reviewed 2005 LTM report. No significant change in the contaminant plume. No significant change in risk to human health and the environment. MW15, a down-gradient MW has only been sampled 2 times. Will require all MW's to be sampled in 2006. If no significant change in contaminant plume, ADEC will consider a request to reduce the number of wells sampled to 3 (MWs 1, 2, and 7) . |
Donald Seagren |
| 3/14/2007 |
Exposure Tracking Model Ranking |
|
Former Staff |
| 4/4/2007 |
Document, Report, or Work plan Review - other |
Reviewed 2006 groundwater monitoring report. Only MW2 shows contamination above cleanup levels. No significant change to risk to human health or the environment. A Conceptual Site Model will be developed and submitted in 2007. |
Donald Seagren |
| 9/10/2007 |
Document, Report, or Work plan Review - other |
Reviewed annual monitoring report. Only MWs 2 & 7 contain benzene above cleanup levels. All other constituents in all other MWs are below cleanup levels. Change in monitoring program and evaluation for potential site closure has been requested. There is still an issue of some contaminated soil remaining on-site above cleanup levels. |
Donald Seagren |
| 3/6/2008 |
Update or Other Action |
Meeting with Chevron and consultant. Semi-annual GW monitoring will be conducted in 2008 to obtain additional GW data to develop site closure strategy. |
Donald Seagren |
| 6/13/2008 |
Update or Other Action |
Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. |
Alyce Hughey |
| 11/26/2008 |
Update or Other Action |
Reviewed the First Semiannual 2008 Groundwater Monitoring Report, dated September 17, 2008 from Conestoga-Rovers & Associates for Paul Horwath. Benzene was detected above the groundwater cleanup levels in MW-2, MW-3, and MW-7, however all the constituents remained below the alternate cleanup levels approved for this site on February 4, 2003. |
Alyce Hughey |
| 1/16/2009 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77748 UST removal. |
Alyce Hughey |
| 1/28/2009 |
Update or Other Action |
Reviewed the Second Semiannual 2008 Groundwater Monitoring Report, dated December 15, 2008 from Conestoga-Rovers and Associates for Paul Horwath and provided him a summary for his review and oversight. Site conditions remain stable with an overall decreasing trend in hydrocarbon concentrations. Monitoring Well UMW-15, which is located by the property boundary, has not been located during the past two monitoring events due to construction. A replacement monitoring well may need to be installed along the same property boundary if the monitoring well has been damaged or destroyed. |
Alyce Hughey |
| 8/28/2009 |
Document, Report, or Work plan Review - other |
Reviewed and approved the Monitoring Well Decommissioning and Installation Workplan, dated August 7, 2009, from Conestoga-Rovers and Associates. Monitoring wells UMW-6 and UMW-5 will be decommissioned in accordance with ADEC's Monitoring Well Guidance, dated February 2009, and one additional monitoring well will be installed in the former location of monitoring well UMW-15 (UMW-15 was destroyed during 2008 road improvements along Lower Mill Bay Road. The following condition was applied to the approval to the workplan. During the decommissioning of the groundwater monitoring wells, the bottom end caps on the monitoring wells shall be knocked free of the well screens prior to the placement of grout via tremie tube. This to be followed by removal of the entire casing. |
Paul Horwath |
| 9/2/2009 |
Document, Report, or Work plan Review - other |
Reviewed the First Semiannual 2009 Groundwater Monitoring Report, dated July 31, 2009, from Conestoga-Rovers & Associates for Paul Horwath and prepared a summary for his reivew and oversight. Site conditions remain stable with an overall decreasing trend in hydrocarbon concentrations. Groundwater monitoring will continue in order to evalute the remaining hydrocarbon contamination remaining at the site. |
Alyce Hughey |
| 11/30/2009 |
Offsite Soil or Groundwater Disposal Approved |
Approved the transport of one 55 gallon drum of petroleum impacted soil to Alaska Soil Recycling in Anchorage for treatment and disposal under their ADEC approved Opertion Plan. Following treatment, ASR's post-treatment sampling and analysis of this treated soil should include analytical testing for GRO, DRO, and BTEX. |
Paul Horwath |
| 2/2/2010 |
Document, Report, or Work plan Review - other |
Reviewed the Second Semiannual 2009 Groundwater Monitoring Report, dated December 29, 2009 from Conestoga-Rovers and Associated for Paul Horwath. Site conditions remain stable with an overall decreasing trend in hydrocarbon concentrations. Monitoring well UMW-15 was replaced with UMW-15R, and monitoring wells UMW-5 and UMW-6 were decommissioned. ADEC provided approval for the installation and decommissioning activities on August 28, 2009. |
Alyce Hughey |
| 2/23/2010 |
Document, Report, or Work plan Review - other |
Reviewed the Monitoring Well Reinstallation and Decommissioning Report, from Conestoga-Rovers & Associates, dated January 20, 2010 for Paul Horwath. Monitoring well UMW-15R was installed on September 1, 2009 to replace UMW-15 at a depth of 15 feet below ground surface, and static water level was encountered at approximately 8.5 feet below ground surface within the monitoring well. No soil contamination was found above the soil cleanup levels during the development of the monitoring well. Monitoring wells UMW-5 and UMW-6 were decommissioned on September 1, 2009 due to the low hydrocarbon groundwater concentrations within the wells. |
Alyce Hughey |
| 12/14/2010 |
Document, Report, or Work plan Review - other |
Reviewed the First Semiannual 2010 Groundwater Monitoring Report, dated October 7, 2010, from Conestoga-Rovers and Associates. During the June 2010 sampling event five of the six monitoring wells sampled showed decreasing hydrocarbon concentrations. Monitoring well UMW-4 had an increase in Benzene concentrations to above the alternate cleanup levels. This increase in concentration is consistent to the previous spring of 2009 sampling event. |
Alyce Hughey |
| 5/10/2011 |
Document, Report, or Work plan Review - other |
Reviewed the Supplemental Site Assessment Report and Cleanup Complete with Institutional Controls Request, dated March 29, 2011, from Conestoga-Rovers & Associates. On November 3, 2010 monitoring wells UMW-1, UMW-3, UMW-7 and UMW-15R were decommissioned according to ADEC February 2009 Monitoring Well Guidance. Two groundwater monitoring wells were sampled with benzene being detected above the groundwater cleanup levels in one well sampled. Seven soil borings were advanced in areas of known historical contamination with results detecting benzene above the record of decision levels with concentrations ranging from 0.4 to 8.7 mg/kg at depths of 5.5 to 8.5 feet below ground surface (ft. bgs). Residual soil contamination exceeding the migration to groundwater cleanup levels of DRO at 1,600 mg/kg at 5.5 ft. bgs, benzene at 0.2 mg/kg at 3.5 ft. bgs, and GRO at 700 mg/kg at 8.5 ft. bgs were detected in the subsurface on November 1, 2011. |
Alyce Hughey |
| 7/20/2011 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 77748 name: UST removal |
Paul Horwath |
| 7/20/2011 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77748 UST removal. |
Paul Horwath |
| 7/21/2011 |
Final Cleanup Report Reviewed |
Completed review of information in the project file, previous reports, and the Supplemental Site Assessment Report and Cleanup Complete with Institutional Controls Request, dated March 29, 2011, from Conestoga-Rovers & Associates. |
Paul Horwath |
| 7/22/2011 |
Long Term Monitoring Complete |
No further groundwater quality monitoring is necessary at this site. |
Paul Horwath |
| 7/22/2011 |
Site Characterization Report Approved |
Completed review of information in the project file, previous reports, and the Supplemental Site Assessment Report and Cleanup Complete with Institutional Controls Request, dated March 29, 2011, from Conestoga-Rovers & Associates. |
Paul Horwath |
| 7/22/2011 |
Cleanup Complete Determination Issued |
A corrective action complete decision letter was issued. |
Paul Horwath |
| 10/31/2011 |
Update or Other Action |
Conditional approval was issued to discharge the purged groundwater that was collected from the 2011 groundwater sampling event to the ground surface. This request is approved, provided that there is soil surface present at this site which will accept these waters, without any discharged wastewaters running overland and leaving the site. This approval is specifically conditioned upon the requirement that all discharged wastewaters remaine onsite, and infiltrate to the surface soils onsite. No discharged wastewater shall run off the property as surface water runoff. |
Paul Horwath |
| 12/12/2011 |
Document, Report, or Work plan Review - other |
Reviewed the First Semi-Annual 2011 Groundwater Monitoring and Sampling Report, dated October 20, 2011, and prepared by Conestoga-Rovers and Associates. During the April 21, 2011 sampling event the two remaining monitoring wells were sampled UMW-2 and UMW-4. UMW-2 has shown a consistent declining trend, where UMW-4 had an increase in Benzene concentrations to above the alternate cleanup levels. This increase in Benzene concentration is consistent to previous spring groundwater sampling events. |
Alyce Hughey |
| 1/6/2012 |
Document, Report, or Work plan Review - other |
Reviewed the Groundwater Monitoring Well Decommissioning Report, dated November 30, 2011 from Conestoga-Rovers & Associates. The last two monitoring wells remaining on site (UMW-2 and UMW-4) were decommissioned on September 28, 2011 in accordance with ADEC's February 2009 Monitoring Well Guidance. UMW-2 was matched to grade with gravel and UMW-4 was matched to grade with asphalt. |
Alyce Hughey |
