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Site Report: Lake Hood Air Harbor

Site Name: Lake Hood Air Harbor
Address: 4955 Aircraft Dr.; , Anchorage, AK 99502
File Number: 2100.26.264
Hazard ID: 23409
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 61.181702
Longitude: -149.979239
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

In 1995, three USTs (two 4,000 gallon and one 2,000 gallon), a dispenser station near the water’s edge, and associated buried fuel lines were removed. In 1998, a fourth UST, able to hold 1,000 gallons of fuel ,was removed from the south property boundary in 1998. Since 1995 three excavation events have taken place at Lake Hood Air Harbor to remove contaminated soil near the former USTs. Confirmation soil samples collected during the 1998 and 2003 excavations revealed that the eastern side walls (adjacent to Lake Hood) of both excavations exceed Department's most stringent cleanup levels for petroleum constituents. Moreover, contaminated soil beneath a power line which crosses the northern portion of the 2003 excavation was not removed. Monitoring wells placed down-gradient of the former tank farm and adjacent to Lake Hood have repeatedly exceeded Departmental cleanup levels for benzene. FKA L55.212

Action Information

Action Date Action Description DEC Staff
9/13/1995 Site Added to Database Former Staff
9/13/1995 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 76215 ADD; Site added to database. Former Staff
9/20/1995 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; LUST corrective action underway. Former Staff
9/20/1995 Update or Other Action CAPR; Reviewed a CAP report. Former Staff
9/20/1995 Leaking Underground Storage Tank Corrective Action Underway LCAR; Reviewed work to date. Former Staff
9/20/1995 Release Investigation RELR; Review of work to date. Former Staff
10/12/1995 Update or Other Action NOR; Notice of release letter sent. Former Staff
2/28/1996 Leaking Underground Storage Tank Corrective Action Underway CAPA; Reviewed overexcavation results and asked for a corrective action plan to address remains. Former Staff
3/8/1996 Release Investigation SA2A; Reviewed a phase 2 site assessment and requested additional information - RI & CA. Former Staff
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: LAKE HOOD AIR HARBOR Former Staff
6/23/1998 Long Term Monitoring Established Long term monitoring established. Todd Blessing
6/12/2000 Release Investigation Approved plan for additional investigation Former Staff
6/22/2000 Release Investigation Approved installation of one additional MW near Lake Hood. Details worked out by J Carnahan and S Bainbridge. Former Staff
8/8/2000 Underground Storage Tank Site Characterization or Assessment Latest MW results: Exceeds cleanup levels for B in MW-3(10.6ppb), MW-1(20.7ppb) and MW-5(570ppb). Exceeds for GRO in MW-5(2.6ppm). Lynne Bush
1/3/2001 Release Investigation Sent approval letter for continuation of investigation in prep for possible RA, after discussion with L Nuechterlein and S Bainbridge. Lynne Bush
1/8/2001 Update or Other Action Letter from T Boston capping grant at $250,000. Though the work plan stands approved, the FAP review does not provide requested funding amount. Subsequent discussion between PM and FAP did not resolve issue. Lynne Bush
1/17/2001 Update or Other Action Per discussion with FAP PM, FAP to contact RP with request for revised WP for investigation and action within budget. Lynne Bush
3/12/2001 Release Investigation Last round of sampling incomplete due to inability to sample certain wells, etc. Still waiting on report. Lynne Bush
9/27/2001 Update or Other Action Rev'd file- have not submitted anything to Dep't since approval of WP in Jan 2001. Actions have not been completed and gw cleanup levels, as of Aug 00, still exceed MCLs. Lynne Bush
10/25/2001 Update or Other Action Discussed need to reply to 75-day letter asap with D Buteyn Lynne Bush
12/20/2001 Update or Other Action Site transferred Bush -> Weimer Lynne Bush
6/20/2002 Leaking Underground Storage Tank Corrective Action Underway FAP CAP approved to excavation contaminated soil and de-water excavation. 5 additional MWs to be installed. Robert Weimer
11/3/2003 Update or Other Action Site Transferred from Wiemer to T. Blessing Todd Blessing
4/21/2004 Leaking Underground Storage Tank Corrective Action Underway Reviewed and approved of CAP and grant amendment to conduct gw and surface water sampling, and investigate possible indoor air pathway Todd Blessing
6/23/2004 Update or Other Action Reviewed June 14, 2004 Groundwater Monitoring and Site Closure Report. Pore water sampling results suggust surface water standards are being exceeded in Lake Hood. Submitted letter requesting monitoring plan for Lake Hood including using passive diffusion sampling bags at the surface water/groundwater interface. Todd Blessing
7/15/2004 Update or Other Action Participated in a meeting between Ron Smith Jr., John Swamm, and Cindy Bartlett with regard to the sites status. John agreed to conduct surface water monitoring this spring for BTEX components at the point of compliance. Todd Blessing
3/18/2005 Update or Other Action Reviewed work plan for passive diffusion bag sampling at the sediment/surface water interface. AMEC Earth and Environmental Inc. proposes to deploy passive diffusion samplers along the lake hood shoreline in order to assess whether surface water standards are being exceeded at the sediment/surface water interface. A letter was submitted to responsible party approving of scope of work provided in work plan provided analytical data is validated according to Department standards. Todd Blessing
8/2/2005 Update or Other Action File number issued 2100.26.264 (FKA L55.212) Aggie Blandford
9/7/2005 Document, Report, or Work plan Review - other Reviewed surface water monitoring report. Five passive diffusion bag were used to sample the sediment/surface water interface along the Lake Hood Air Harbor shoreline. The samplers were deployed for approximately two weeks, and then retrieved for an analysis of the water for BTEX. Benzene was the only contaminant detected at a level of 0.0054 and 0.0042 mg/L – which are below the 18 AAC 70 standards Todd Blessing
9/9/2005 Conditional Closure Approved Based on the information provided to date, the Department has determined that no further remedial action is required at the Lake Hood Air Harbor site. There are areas of soil and groundwater contamination that remain above the 18 AAC 75 soil and groundwater cleanup levels established for this site but it does not pose a risk to human health or the environment. Todd Blessing
9/9/2005 Institutional Control Record Established The following intitutional controls are established for this site: 1. any proposal to excavate or transport soil or groundwater from the site requires ADEC approval in accordance with 18 AAC 78.274(b); 2. groundwater and surface water will require periodic monitoring to ensure contamination is decreasing and not migrating into Lake Hood and/or off site. A monitor plan shall be prepared and submitted to ADEC for review and approval. 3. additional investigation and/or cleanup action may be necessary in the future if new information indicates there is hazardous substance contamination at this site that may pose a risk to human health and the environment. Todd Blessing
10/5/2007 Update or Other Action Issued letter to John Schwamm requesting submittal of a long term groundwater and surface water monitoring plan to DEC by February 29, 2008. Todd Blessing
11/9/2007 Update or Other Action DEC received a letter from John Schwamm that was dated November 2, 2007. Mr. Schwamm noted that his prior consultant no longer has offices in Alaska and therefore, cannot do further work. Mr. Schwamm proposed to commit to hire a new consultant to conduct groundwater monitoring during the summer of 2008. DEC issued a response letter agreeing to the summer of 2008 groundwater monitoring but also requesting that Mr. Schwamm's new consultant develop a groundwater monitoring plan prior to doing any field work. Todd Blessing
2/15/2008 Long Term Monitoring Established DEC staff reviewed and approved a work plan titled “Long Term Monitoring for Groundwater and Surface Water at Lake Hood Air Harbor.” The work plan was prepared by Restoration Science and Engineering (RSE), dated January 08, 2008 and received at DEC’s Anchorage office on January 18, 2008. This work plan presents proposed long term groundwater and pore water monitoring activities. Pore water and groundwater will be sampled every other spring beginning in 2008. Todd Blessing
6/3/2008 Update or Other Action DEC staff reviewed a spring 2008 groundwater and pore water sampling report. The report was received on May 31, 2008 and was prepared by Restoration Science and Engineering. Four monitor wells and three piezometers were sampled and analyzed for gasoline constituents. The pore water samples were also evaluated for volatile organic compounds (VOCs). The levels of gasoline constituents in two of the monitor wells (i.e. MW-7 and MW-9) exceeded DEC cleanup criteria. The levels of benzene in two of the pore water samples collected from piezometers PW-1 and PW-2 exceeded DEC cleanup criteria. In pore water samples, benzene ranged from 0.0978 to 4.6 mg/L. Todd Blessing
6/21/2010 Update or Other Action DEC staff reviewed Restoration Science and Engineering's "Spring 2010 Results for Groundwater and Pore Water Sampling at Lake Hood Air Harbor", dated May 25, 2010. In this report, Restoration Science and Engineering (RSE) discussed the results of groundwater and pore water sampling. Groundwater samples were collected from monitoring wells MW-5, MW-6, MW-7, and MW-9. Pore water samples were collected from piezometers at the Lake Hood shoreline. Groundwater samples were analyzed for GRO and BTEX while pore water samples were analyzed for TAH and TaQH. The levels of benzene in groundwater samples collected from wells MW-7 and MW-9 exceeded DEC cleanup values. In addition, benzene and toal aqueous hydrocarbons concentrations exceeded DEC surface water criteria from pore wate samples collected from piezometers PW-1 and PW-2. Todd Blessing
6/30/2011 Update or Other Action Transferred Project Manager to IC Unit Bianca Reece
8/1/2011 Update or Other Action DEC approval is given to decommission monitoring wells 3 and 8 due to their location interfering with construction of a new hangar. It has been determined that groundwater in the area of the airport will not be used as a current or future drinking water source. Evonne Reese
11/9/2011 Institutional Control Compliance Review IC review conducted and the tickler system was updated with the groundwater monitoring requirement for spring 2012. Evonne Reese
5/28/2013 Institutional Control Update Approval was given for excavation of approximately 200 cubic yards of soil for the construction of a new hangar. Any contaminated soil encountered will be kept onsite and segregated from other soil. In addition, while the contractor is onsite for the excavation activities, the needed groundwater monitoring will be performed. Evonne Reese
6/4/2013 Institutional Control Update Approval was given for the removal of approximately 10 cubic yards of topsoil from the construction site. The topsoil is derived from a 15 foot by 30 foot area and less than 8 inches deep and generally not considered a part of the subsurface soil which was previously impacted and covered with clean backfill. Evonne Reese
7/8/2013 Update or Other Action DEC staff reviewed Restoration Science and Engineering's "Spring 2013 Results for Groundwater and Pore Water Sampling at Lake Hood Air Harbor," dated July 5, 2013. Groundwater samples were collected from monitoring wells MW-5, MW-6, MW-7, and MW-9. Three pore water samples (PW-1, PW-2, and PW-3) were collected. Groundwater samples were analyzed for GRO and BTEX while pore water samples were analyzed for BTEX, TAHs, and PAHs. The concentrations of GRO and benzene in groundwater samples collected from wells MW-7 and MW-9 exceeded DEC cleanup values, but have decreased since the last sampling event. In addition, benzene, TAH, and TAqH concentrations exceeded DEC cleanup criteria in pore water sample PW-2. Kristin Thompson
3/25/2015 Institutional Control Update Provided approval to the consultant to decommission monitoring wells 5 & 6 since they have been showing either below or non-detect for contaminants in 2008, 2010, and 2013. Evonne Reese
8/12/2015 Institutional Control Update DEC staff reviewed Restoration Science and Engineering's "Spring 2015 Results for Groundwater and Pore Water Sampling at Lake Hood Air Harbor," dated August 5, 2015. Monitoring wells MW-5 and MW-6 were decommissioned in accordance with the ADEC Monitoring Well Guidance. Groundwater samples from wells MW-7 and MW-9 were analyzed for GRO and BTEX. Pore water samples from PW-1, PW-2, and PW-3 were analyzed for BTEX, TAHs, and PAHs. ADEC Table C cleanup levels were exceeded for GRO and benzene in MW-7, and for benzene only in MW-9. Pore water samples PW-1 and PW-2 measured above Table C cleanup levels for benzene. All pore water sampled exceeded the cleanup criteria for TAH and TAqH. Kristin Thompson
9/3/2015 Long Term Monitoring Complete Future groundwater monitoring requirements are removed and the remaining groundwater monitoring wells can be decommissioned. A letter with this information was issued and sent to the responsible party. Evonne Reese
7/21/2016 Institutional Control Compliance Review IC compliance review conducted. A letter was issued to the responsible party reminding them of their requirement to decommission remaining groundwater monitoring wells. Reminder system set to follow-up in six months. Kristin Thompson
8/2/2016 Document, Report, or Work plan Review - other Approved a workplan to decommission the remaining groundwater monitoring wells according to the Monitoring Well Guidance. A report is to follow. Evonne Reese
8/5/2016 Institutional Control Update Received an email from the consultant confirming that the wells were decommissioned on August 4th and that a brief report will follow in a few weeks. Evonne Reese
2/6/2017 Document, Report, or Work plan Review - other Received the Groundwater Well Decommissioning report dated January 2017 for MW-7 and MW-9 which were decommissioned according to the 2013 Monitoring Well Guidance. Evonne Reese
8/24/2017 Institutional Control Update During the construction of the Lake Hood Seaplane Base West Ramp, which is adjacent to this property,30 yards of soil was excavated. This soil showed GRO concentrations above cleanup and is attributed to the historic contamination remaining on this property. Lake Hood management (DOT) will work with the property lessee to dispose of the soil on airport property, either in the airport landspread area or thermally treated in the airport soil burner. Evonne Reese

Contaminant Information

Name Level Description Media Comments
Benzene > Human Health/Ingestion/Inhalation Soil
GRO > Human Health/Ingestion/Inhalation Soil
GRO > Table C Groundwater
Benzene > Table C Groundwater

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP A Record of Decision was submitted to the responsible party in September 2005.

Requirements

Description Details
Excavation / Soil Movement Restrictions Any proposal to excavate or transport soil or groundwater from the site requires ADEC approval in accordance with 18 AAC 78.274(b)
Advance approval required to transport soil or groundwater off-site. Standard condition.
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) Standard condition.
Groundwater Use Restrictions Installation of groundwater wells requires ADEC approval.
Periodic Review Every three years.

No associated sites were found.

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby