Division of Spill Prevention and Response

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Site Report: Hamilton's Place


Site Name: Hamilton's Place
Address: 18280 Sterling HighwayMi. 48.5 Sterling Hwy, Cooper Landing, AK 99572
File Number: 2308.26.001
Hazard ID: 23497
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 60.490152
Longitude: -149.826060
Horizontal Datum:WGS84


We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.


Problems/Comments

During the removal of one 1,500 unleaded gasoline, one 1,000 gasoline, one 1,000 diesel, and installation of new double walled UST's, the highest concentrations of VPH at 3,760 ppm, Benzene at 23.8 ppm, BTEX at 1,637 ppm, GRO at 3,850 ppm was found in the soils on May 2 and 3 1994. On 11-28-00 groundwater contamination was confirmed with GRO at 15.5 mg/L, Benzene at 3.17 mg/L, and Toluene at 2.40 mg/L. Seven monitoring wells was installed to monitor the groundwater. On March 29 to April 12, 2004 400 cubic yards of soils was removed and transported to ASR for thermal remediation. Some moderate levels of contamination is left under the asphalt cap done on June 18, 2004. Site conditions now will allow natural attenuation to continue to degrade the benzene concentrations in the groundwater. Updated 1-11-06 Alyce Hughey



Action Information

Action Date Action Description DEC Staff
5/3/1994 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77760 ADD; * Not Assigned
5/3/1994 Site Added to Database * Not Assigned
7/18/1994 Update or Other Action NOR; Reviewed consultant's UST closure letter and issued a NORL to RP. * Not Assigned
9/15/1994 Underground Storage Tank Site Characterization or Assessment SA1R; Reviewed phase 1 site assessment. * Not Assigned
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: MARK R. & DOLORES A. WILSON * Not Assigned
11/28/1997 Update or Other Action Stil has contamination. Sent information to DEC.; Dotty Wilson; 595-1260 * Not Assigned
10/11/1999 Leaking Underground Storage Tank Cleanup Initiated - Petroleum * Not Assigned
10/22/1999 Update or Other Action Paul Horwath sent an approval letter after reviewing the Release Incestigation Work Plan from EMI dated 10-20-99. The plan approves for soil borings and soil sampling. Alyce Hughey
10/26/1999 Underground Storage Tank Site Characterization or Assessment Borings installed to delineate extent of soil/groundwater contamination. Monica English
3/23/2000 Update or Other Action Paul Horwath sent a letter with review comments after reviewing the Site Characterization Report from EMI dated March 2000. Approval for additional sampling/testing, request for a CAP, and recommended in-situ soil remediation. Alyce Hughey
11/13/2000 Update or Other Action Paul Horwath sent an approval letter to install up to four gourndwater monitoring wells and soil and goundwater sampling after reviewing the Monitoring Well Installation Workplan and Cost Proposal from EMI, dated October 24, 2000. Alyce Hughey
12/1/2000 Release Investigation Monitor Wells installed to delineate groundwater contamination. Monica English
6/26/2001 Update or Other Action Paul Horwath sent an approval letter to re-sample of, and re-measurement of water elevations in the three existing groundwater monitoring wells after reviewing the Work Plan from EMI dated February 16, 2001. Alyce Hughey
3/8/2002 Update or Other Action Monica English sent a letter with review comments after reviewing the 2002 Monitoring Well Installation and Sampling Work Plan, dated January 15, 2002 from EMI. Alyce Hughey
4/26/2002 Update or Other Action Monica English sent an approval letter after reviewing the 2002 Work Plan (Revised) Monitoring Well Installation and Sampling and Contaminated Soil Removal from EMI, dated April 18, 2002. Alyce Hughey
5/21/2002 Update or Other Action Updated GIS information. Accuracy Information (for those who want it): Method: MAP INTERPOLATION - Kenai Peninsula Borough Tax Parcels Map 1999 Scale of Source: approximately 1:24,000 Datum: Nad27 Accuracy: Approx 500 meters (some may be better but I wouldn't claim better accuracy without seeing the physical site files and double-checking to see if the locations were on the correct tax parcel) Cynthia Pring-Ham
7/17/2002 Release Investigation Additional monitor wells installed to delineate extent of groundwater contamination. Monica English
11/27/2002 Report or Workplan Review - Other Groundwater Monitoring Report for in place wells (MW1 thru MW5) Monica English
1/9/2003 Update or Other Action 2003 Workplan for additional monitor well installation and natural attenuation assessment received. Monica English
1/21/2003 Update or Other Action ADEC Comments to Monitoring well Installation, sampling, and Natural Attenuation Assessment plan. Monica English
2/7/2003 Update or Other Action Monica English sent an approval letter after reviewing the 2002 Work Plan (Additional Wells) Monitoring Well Installation and Sampling, from EMI, dated February 5, 203, approving two downgradient monitor wells be installed near the shoulder of the bank above the Kenai River. Monica English
2/10/2003 Update or Other Action Revised work plan for additional monitor well installation received and reviewed. Monica English
4/4/2003 Report or Workplan Review - Other Report on the installation of downgradient monitor wells MW6 and MW7. Monitor wells MW4, MW5 and MW6 were sampled and all wells met GCL for contaminants of concern (gasoline). Monica English
5/22/2003 Report or Workplan Review - Other Groundwater Monitoring Report received and reviewed. Monitor wells MW3, MW5 and MW7 sampled. Wells MW5 & MW7 met GCL for contaminants of concern. MW3 exceeds GCL for benzene. This is consistent with previous sampling. Monica English
6/26/2003 Site Visit DEC staff Monica English and Paul Horwath visit site to speak with RP and inspect location of monitor wells, former tank site, utilities/improvements, and river. Monica English
7/21/2003 Report or Workplan Review - Other Groundwater Monitoring report received and reviewed. Monitor wells MW1, MW5, MW6, and MW7 sampled. Monitor wells MW5, MW6 & MW7 met GCL for COC. Monitor well MW1 exceeds GCL for benzene. This result is higher than last 3 sampling events but lower than the first sampling event. Monica English
9/29/2003 Update or Other Action Monica English sent an approval letter after reviewing the Fall 2003 Amended Work Plan Bore Hole Testing from EMI dated September 21, 2003. The approval was to install three boreholes in areas suspected of having highly contaminated soils. Alyce Hughey
10/15/2003 Underground Storage Tank Site Characterization or Assessment Installation of 3 borings to attempt to determine amount of contaminated soil accessible for excavation without removal of current UST system piping and dispenser. Borings indicate some contaminated soil around dispenser island accessible for excavation. Monica English
10/23/2003 Report or Workplan Review - Other Groundwater Monitoring Report received and reviewed. Monitor wells MW1, MW3, MW5, MW6 and MW7 sampled. Monitor wells MW5, MW6 & MW7 results were below GCL for COC. Monitor wells MW1 and MW3 continue to exceed the benzene GCL. Monica English
2/5/2004 Report or Workplan Review - Other February 2004 Monitoring Well Sampling report. Monitor wells MW1, MW3, MW5, MW6 and MW7 sampled. Monitor wells MW5, MW6 & MW7 below GCL for COC. Moniter wells MW1 and MW3 continue to exceed benzene GCL. Results slightly lower than previous sample results. Monica English
3/26/2004 Leaking Underground Storage Tank Corrective Action Underway ADEC Conditional Approval letter was issued for a CAP that addresses the excavation and treatment of contaminated soil. Monica English
4/9/2004 Site Visit Staff conducted a site visit during contaminated soil excavation activities. Monica English
4/21/2004 Report or Workplan Review - Other April 2004 Groundwater Sampling report. Monitor wells MW1, MW2, MW3, MW4, MW5, MW6 & MW7 were sampled. Only MW3 exceeded benzene and GRO cleanup levels. All other wells sampled met GCL for contaminants of concern. Monica English
5/11/2004 Report or Workplan Review - Other Groundwater Monitoring report. Monica English
6/9/2004 Report or Workplan Review - Other Contaminated Soil Removal and Remediation report review. Approx. 400 cy contaminated soil excavated near dispenser island. Soil trucked to ASR in Anchorage for treatment. Monica English
6/14/2004 Report or Workplan Review - Other Review "2004 Site Characterization Report". Analytical results for excavation area identifies areas of remaining soil contamination. (smear zone, beneath dispensers and fuel lines and in excavation). Site backfilled with clean fill and paved. Monica English
6/16/2004 Report or Workplan Review - Other May 2004 Groundwater Monitoring report review. Monitor wells MW1, MW3 & MW6 sampled. Only monitor well MW3 exceed GCL for GRO and benzene. Other wells met GCL for COC. Monica English
7/8/2004 Institutional Control Record Established A signed copy of the Notice of Environmental Contamination and Cleanup is required to be submitted to this office. Monica English
7/8/2004 Conditional Closure Approved Conditional NFRAP determination made. Conditions of NFRAP letter include: long term gw monitoring, deed notice on property, requirements if any public/private water wells installed. Monica English
7/8/2004 Long Term Monitoring Established Long term groundwater monitoring established. Groundwater sampling required every two years to track contaminant levels. Monica English
8/30/2004 Report or Workplan Review - Other File number assigned and entered into the Fileroom DB and LUST DB. Alyce Hughey
1/7/2005 Update or Other Action A letter of intent was sent to the RP regarding confirmation of their intention to continue with the conditions fo the No Further Action Planned determination at this facility. Monica English
4/5/2005 Update or Other Action A notorized copy of the Notice of Environmental Cleanup and Residual Soil and Groundwater Contamination document is received from the RP and added to the file per the NFRAP requirements. Monica English
1/11/2006 Update or Other Action Using the Site Maps in an Underground Fuel Tank Removal Report, Hamilton's Place, from Rozak Engineering, dated August 1994, in conjunction with TopoZone Pro and the KPB Parcel Lookup, entered the coordinates for this site. Metadata includes No Topo Basemap, TopoZone Pro Street Maps, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Alyce Hughey
10/9/2006 Update or Other Action Project manager changed from Monica English to Don Fritz, per Paul Horwath. Alyce Hughey
3/20/2007 Exposure Tracking Model Ranking Initial Site Ranking using the ETM Don Fritz
8/26/2011 Report or Workplan Review - Other During the October 12, 2010 groundwater sampling event; three of the existing seven monitoring wells were sampled in accordance with the ADEC approved Long Term Groundwater Monitoring Plan for the site. The analytical results for all three wells were undetected for all analytes tested for. These results constitute a substantial reduction in contaminant concentrations in MW#3, compared to historical sample data from MW#3. A new sampling procedure was used for the first time during this sampling event. Previous sampling procedures used a bailer, and for this sampling event a HydraSleeve sampler was used. The cause for the notable reduction in BTEX concentrations in MW#3 remains unknown at this time. The new sampling procedure could be one cause. EMI (the environmental consultant), recommended that two more sampling events, 3 to 5 months apart, be performed using the HydraSleeve sampling procedure to confirm that the level of contamination has decreased in the aquifer. ADEC will need to require at least one additional bailer sampling event if the HydraSleeve sampler continues to produce ‘undetected’ sample data from MW#3. Paul Horwath
11/15/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77760 Hamiltons Place. Paul Horwath
12/26/2012 Report or Workplan Review - Other Reviewed the Monitoring Well Sampling Report, dated October 2012, from Environmental Management Incorporated. On August 27, 2012 three of the existing seven monitoring wells (MW-3, MW-5 and MW-7) were sampled. Three samples were collected from MW-3 using three different sampling methods, one using a HydraSleeve Groundwater Sampler, one using a Bladder Pump, and one using a Teflon Bailer. Sample results for MW-3 were benzene at 0.00092 mg/L using the HydraSleeve Groundwater Sampler, benzene at 0.068 mg/L and GRO at 0.111 mg/L using a Bladder Pump, and Benzene at 0.0953 and GRO at 0.154 mg/L using the Teflon Bailer. Sample results using a HydraSleeve Groundwater Sampler were benzene at 0.00101 mg/L in MW-5 and non-detect for all analytes in MW-7. Alyce Hughey
5/3/2013 Update or Other Action ADEC issued approval of a groundwater monitoring well decommissioning plan on May 3, 2013, authorizing approval to decommission groundwater monitoring wells MW1, MW2, MW4, MW5, MW6, and MW7. Groundwater monitoring well MW3 is to be maintained/preserved for future groundwater sampling and analysis. Paul Horwath
5/23/2013 Update or Other Action Monitoring wells MW-1, MW-2, MW-4, MW-5, MW-6 and MW-7 were decommissioned on May 9th and 14th of 2013. ADEC received the report and accompanying photographs documenting the decommissioning of these six (6) groundwater monitoring wells. Groundwater monitoring well MW-33 is now the sole well remaining onsite. Alyce Hughey
8/27/2013 Update or Other Action Paul Horwath approved for the August 6, 2013 e-mail proposal for sampling groundwater monitoring well MW-3 with the following conditions: 1) ADEC’s Draft Field Sampling Guidance, May 2010 (page 29), states that low yield monitoring wells should be sampled when the well has recharged to approximately 80% of its pre-purge volume, when practical. Should MW-3 recharge to 80% in less than 1 hour, it should be sampled at that time: 80% of its pre-purge volume. 2) ADEC’s Draft Field Sampling Guidance, May 2010 (page 29), states that groundwater samples must be collected as close as possible to the soil/groundwater interface (i.e. water table). The depth to the water column surface and the depth the HydroSleeve is lowered into the water column should be measured, controlled, and documented, such that the HydroSleeve opens, and the water sample is collected, in the top portion of the water column in MW-3. This will help also reduce the silt/sediment content in the water sample collected for laboratory analysis. Alyce Hughey
12/5/2013 Update or Other Action Received and reviewed the November 2013 Monitoring Well Sampling Report prepared by Environmental Management, Incorporated. The benzene concentration detected in MW#3, the last remaining groundwater monitoring well at this site, continues to decline over time. Issued a letter to the owner/operator, removing the requirement for long term groundwater monitoring. The deed notice must remain effective until the benzene concentration in MW#3 meets the ADEC groundwater cleanup level of 5 ug/L. Paul Horwath
12/5/2013 Long Term Monitoring Complete Long term groundwater quality monitoring at monitoring well MW#3 is no longer required. MW#3 will be maintained to allow future sampling and analysis to determine when the water quality meets the groundwater cleanup level for benzene (5 ug/L). Should future sampling demonstrate that groundwater from MW#3 meets the 5 ug/L cleanup level for benzene, a new deed notice could be recorded to supersede and remove the restrictions/conditions of the current Notice of Environmental Contamination which is recorded on the property deed. Paul Horwath
11/6/2014 Institutional Control Update Current project manager chooses to retain management of the site at this time. Kristin Brown
3/12/2015 Update or Other Action Lat/long collected and verified using CS Internal ArcGIS.com web map, and entered into CS database. (PH) 60.490152 -149.826060 Paul Horwath
9/16/2016 Institutional Control Compliance Review IC compliance review conducted. Staff changed from Paul Horwath to IC Unit. IC reminder letter issued. Reminder system set to follow-up every five years. Kristin Brown

Contaminant Information

Name Level Description Media Comments
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil


Control Type

Type Details
Notice of Environmental Contamination (Deed Notice) A Notice of Environmental Cleanup and Residual Soil and Groundwater Contamination was filed in the Seward Recording District for the area around the dispensers for the current UST system.


Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)
Groundwater Use Restrictions Restrictions on installation of any new public or private drinking water wells.