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Site Report: AIA Landspreading Area


Site Name: AIA Landspreading Area
Address: K Taxiway & Runway 6L, Anchorage Int'l Airport, Anchorage, AK 99502
File Number: 2100.38.028.03
Hazard ID: 2740
Status: Active
Staff: Wendy Hansen, 9072693059 wendy.hansen@alaska.gov
Latitude: 61.169013
Longitude: -150.021428
Horizontal Datum:NAD83

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

Approximately 3,000 cubic yards of diesel contaminated soil with concentrations of diesel range organics (DRO) up to 12,500 milligrams per kilogram (mg/kg) were spread in an area between K (Kilo) Taxiway and Runway 6-Right in October 1997. Soils were excavated from the B-Concourse reconstruction project. Soils must be treated to the groundwater migration cleanup standard. Near-surface groundwater has detectable DRO concentrations.

Action Information

Action Date Action Description DEC Staff
7/17/1997 Meeting or Teleconference Held Anchorage International Airport: CSRP staff met with Anchorage International Airport (ADOT&PF) environmental staff, Signature Flight Support personnel, and Emcon environmental consulting firm representatives discuss Department review comments for Emcon's leachability study for a proposed landspreading area between runways at Anchorage International Airport. Low level contaminated soils have been landfarmed at the proposed site, but as a result of Emcon's leachability study, landspreading of soils with higher DRO concentrations is expected to be allowed. Eileen Olson
10/3/1997 Cleanup Plan Approved Approval granted to landspread soils. Eileen Olson
10/3/1997 Cleanup Level(s) Approved Alternative cleanup level of 12,500 mg/kg DRO granted. Eileen Olson
8/26/1999 Update or Other Action Rec'd letter of this date from Mike Evans of AFSC in response to DEC request for a work plan for diverting surface runoff from the landspread area at AIA. Diagram attached to letter. Eileen Olson
12/22/1999 Site Added to Database Diesel contaminated soils from offsite sources landspread without a liner. Eileen Olson
12/30/1999 Site Ranked Using the AHRM Initial ranking. Eileen Olson
1/25/2001 Update or Other Action Submittal of revision 14 of landspreading agreement by AIA. Renee Evans
2/16/2001 Update or Other Action Letter to AIA approving revision 14 of landspreading agreement with conditions. Renee Evans
8/2/2001 Cleanup Plan Approved Approval of groundwater and surface water monitoring plan. Renee Evans
8/22/2001 Update or Other Action Submittal of revision 15 of landspreading agreement by AIA. Renee Evans
1/27/2005 Update or Other Action Reviewed 2004 annual report for the Anchorage International Airport's Landspreading Area. Surface water samples were not collected in 2004 since there was construction on the Landspreading Area discharge. Diesel range organics (DRO), gasoline range organics (GRO), and benzene, toluene, ethylbenzene, and xylenes (BTEX) did not exceed 18 AAC 75.345 Table C levels in any of the groundwater samples collected. The Airport moved stockpiled soil from the 2003 Aviation Museum tank excavation into the area in 2004. Excavated soil from the Alamo tank pull in 2004 was also moved into the area as well. The airport did not test any soils in 2004 and the airport tilled contaminated soil at least once during the summer of 2004. Todd Blessing
3/7/2006 Update or Other Action Reviewed Spring and Fall 2005 Monitoring Report. Groundwater samples were collected from monitor wells MW-6, and MW-8 through MW-1. The levels of contaminants of concern in all groundwater samples did not exceed Department cleanup levels. Sample results for GRO and BTEX were nondetect for both spring and fall monitor events. RRO were not detected in any groundwater sample. DRO were detected in groundwater samples collected from monitor well MW-8 and MW-10. Surface water samples were not collected because no surface water was present during the fall and spring sampling events. Todd Blessing
6/19/2006 Update or Other Action Reviewed and approved of airport plan to remove permanent contaminated site soil storage cells. According to the airport, the soils had been removed in 2000 and a sand layer remains. Restoration Science and Engineering (RSE) will screen and sample the 0.750-ft thick sand bedding that overlies the three separate storage cell containment liners. RSE will collect approximately 100 PID screening saples, evenly distributed across each storage cell. Analytical samples will be collected from locations yielding the highest PID sample readings. Todd Blessing
8/31/2006 Update or Other Action Reviewed the sampling and analysis plan for treated soil at ANC’s landspread area. The sampling and analysis plan was received by the Department on August 16, 2006 and constructed by TELLUS, Ltd. Within the work plan, TELLUS proposes to field screen post-treated soil with a photo-ionizing detector. One field screening sample will be collected from each 30-foot by 30-foot grid plot. Fifteen percent of these field screening samples, which possess elevated field screen readings will be submitted for confirmation laboratory analysis. As part of the sampling and analysis plan, TELLUS requested that RRO analysis be eliminated from the suite of analytes and EPA Method 8021B replace EPA Method 8260. TELLUS also requested that the Department omit the field screening, sampling and analytical testing of the underlying pre-existing soils during the sampling events. At this time, the Department approves of the work plan as proposed by TELLUS provided the following occurs: •TELLUS will collect representative soil samples for field screening and laboratory analysis by collecting a soil core from the surface of the treated soil down to 2 inches below the underlying pre-existing soil; •TELLUS will re-sample locations which possess the highest PID readings; •Soil samples will be collected in triplicate from one sample location during the sampling event. The replicate soil samples will be submitted to the analytical laboratory “blind” •TELLUS will conduct a third party review and discussion of the analytical data quality. The Department requests that TELLUS fill out the Department’ laboratory data review checklist, which is located on the Department website at http://www.dec.state.ak.us/spar/guidance.htm#csp and include the checklist in the final report; and •Within the final report, TELLUS will provide the results of the field screening analysis and a map of the sample locations with their corresponding analytical results. Todd Blessing
10/5/2006 Update or Other Action Approved of a request by ASIG to transport soil stockpiled during the gate N4 construction project to the landspread area. The soil (approximately 992 c.y.) was originally classified as "hot "based on three analytical samples with DRO concentrations 5,080 mg/kg, 9,650 mg/kg, and 19,500 mg/kg. The analytical results suggest that the mean DRO concentration in the stockpiled soil is not above the 12,500 mg/Kg threshold; therefore, the request was approved. Todd Blessing
10/23/2006 Update or Other Action Reviewed Field Summary Report for Taxiway K Reconstruction Project. A 48 inch diameter storm drain piping system along Taxiway K was installed. During construction activities soil was field screened. An estimate of 100 cubic yards of contaminated soil was identified as contaminated and transported to the Landspread area. Todd Blessing
10/23/2006 Update or Other Action Approximately 3 cubic yards of contaminated soil was generated, transported to and stockpiled at the landspreading area during the Taxiway U Reconstruction project. Todd Blessing
11/1/2006 Update or Other Action Approved of Scott Lytle's request to use sand bedding overlying the three permanent storage cell liners as backfill following the removal of the three permanent storage cells. Petroleum constituents were not detected in the sand bedding as documented in a report dated October 26, 2006 which was prepared by Restoration Science and Engineering. Todd Blessing
11/16/2006 Update or Other Action Reviewed November 2006 Soil Sampling Report. Twenty three soil samples were collected from treatment cells #1, #2, and #3 to be analyzed for petroleum constituents. Eleveted levels of benzene were detected in cells #1 and cell #2 from three of the soil samples. Based on the sample results, areas in cell #1 and cell #2 were fertilized, tilled and then subsequently resampled. Following further treatment, 12 additional soil samples were analyzed for volatile organic compounds. The levels of benzene in these samples did not exceed cleanup levels. At this time, only treatment cell #4 is believed to hold soil with elevated levels of petroleum constituents. Cell #4 is comprised of 1,100 cubic yards of soil generated during the 2006 construction season. A letter was issued to ASIG in order to inform Amber Mandt that no further action is neccessary for treatment cells #1, #2, and #3. Todd Blessing
2/2/2007 Update or Other Action Reviewed ANC's 2006 Landspread Monitoring Report. Groundwater samples were collected from monitor wells MW-6, MW-8, MW-9, MW-10, and MW-11 in April and November 2006. A surface water sample was collected in April 2006. No contaminants of concern were detected at levels that exceed Departmental cleanup levels in any of the groundwater or surface water samples. ANC place approximately 200 yard of soil generated during the construction of the rental car facility in the landspreading area. AFSC/ASIG placed approximately 1,100 cubic yards of soil in the landspreading area that was generated from the Gate N4 and Taxiway uniform projects. Todd Blessing
2/7/2007 Exposure Tracking Model Ranking Initial ranking Todd Blessing
5/23/2007 Update or Other Action DEC Reviewed a revised RON 7-11Parking Sampling and Analysis Plan (SAP). The revised SAP was received by DEC on May 21, 2007 and provided procedures to identify, treat, and dispose of any potentially contaminated soil discovered during the surface improvement project. Within the SAP, Tellus Ltd. proposed to evaluate potentially contaminated soil by collecting a combination of discrete samples in accordance with ANC’s P-170 soil testing specifications and multi-incremental (MI) samples. Discrete soil samples would be collected adjacent to ASIG fuel line and associated structures, and ANC field structures while MI samples would be collected in other areas suspected of being contaminated with jet fuel. DEC requested a revised SAP on May 15, 2007 so that Tellus Ltd. could provide more details on the proposed MI sampling approach. A letter was issued to Tellus Ltd. requesting revisions to the work plan. DEC is aware that construction of the project has been initiated without regard to a DEC approved work plan. Todd Blessing
6/5/2007 Update or Other Action CSP reviewed the third version of the sampling and analysis plan (SAP) for the Remote Overnight Parking (RON) 7-11 Construction Project. CSP requested that Tellus Ltd. revise the work plan to address an additional five comments. The revised work plan (fourth version) is due June 15, 2007. Todd Blessing
6/28/2007 Update or Other Action Reviewed the fourth version of a Sampling and Analysis Plan (SAP) for the Remote Overnight Parking (RON) 7-11 Construction Project. Tellus Ltd. prepared the SAP and proposed to do the following: 1. Evaluate potentially contaminated soil by collecting field screening and discrete soil samples in trench excavations and within twenty-five feet of any fuel lines, associated, fuel system structures, and in areas were petroleum impacts are found. 2. Classify soils according to “Clean”, “Warm”, and “Hot” designations. 3. Haul Hot soil directly to Alaska Soil Recycling (ASR), while segregating and stockpiling Warm soil for future analysis. 4. Complete laboratory data review checklists for each analytical work order performed by the analytical laboratory. 5. Issue a final report that includes a narrative of soil classification justification, soil volume, and subsequent placement of all project soils; figures with sampling locations, photos, analytical laboratory and field data. The SAP was approved provided the following occurs: 1. Soil placed in the temporary contaminated soil stockpile area shall be segregated or marked with stakes or flags in approximately 100 cubic yard segments for future analysis. 2. Soil placed in the temporary contaminated soil stockpile area shall not be sampled or disposed of without a CSP approved work plan. 3. Tellus Ltd. will issue a final report to CSP within three weeks of completion of field work. Todd Blessing
7/3/2007 Institutional Control Record Established In accordance with 18 AAC 75.350, ADEC has determined that the unconfined groundwater (above the Bootlegger Cove Formation) at the Anchorage International Airport (AIA) is not a current or future drinking water source. This determination is subject to the following conditions: 1. It applies only within the Airside and Commercial RMZ’s, as described in the Airport-Wide Remediation Management Plan. It does not apply within the Ecological RMZ. 2. It does not establish alternative cleanup levels within those zones but allows ADEC to use the determination in making decisions in accordance with 18 AAC 75.345(b)(2) - (3). 3. Any drinking water wells located on AIA property must be properly abandoned in accordance with ADEC decommissioning procedures within two years of this decision. 4. AIA shall prohibit the installation of any water wells, used for drinking, cooling, washdown, or any other purposes, on the AIA either through 17 AAC 42.410 (b) (27) of the airport leasing regulations or in their individual lease agreement documents. 5. The existing AIA water well used to maintain the water level in Lake Hood is not considered a drinking water well. However, AIA is responsible for determining its wellhead protection area and ensuring that it maintains levels at or below 18 AAC 75.345 Table C values, unless otherwise approved by ADEC. March 19, 2007 Amendment: DEC has determined that the shallow groundwater along the Lake Hood shoreline is not a current or future drinking water source in accordance with 18 AAC 75.350. Therefore, the March 2001 groundwater use determination is amended to include the shallow groundwater in the Ecological RMZ in that determination. Todd Blessing
8/1/2007 Update or Other Action DEC reviewed a letter and attached report dated July 12, 2007 and authored by Scott Lytle, environmental manager of Anchorage International Airport. Mr. Lytle requested closure of landspread soil that originated at the Delta Parking lot. DEC issued a letter on August 1, 2007 approving of Mr. Lytle request. Todd Blessing
8/2/2007 Update or Other Action Reviewed and approved of a request by Tellus Ltd. to directly haul approximately 400 cubic yards of contaminated soil generated during the remote overnight parking 7-11 construction project to the landspread area. Todd Blessing
8/30/2007 Update or Other Action DEC reviewed a letter, dated July 31, 2007 that was authored by Scott Lytle, Environmental Manager of the Anchorage International Airport (ANC). A report prepared by Restoration Science and Engineering (RSE) was attached to the letter and also reviewed. Mr. Lytle requested that CSP issue a closure letter for three long term storage cells located in West Airpark, ANC. A closure letter was issued by CSP on August 30, 2007 for the three long term storage cells. Todd Blessing
5/20/2008 Update or Other Action DEC staff reviewed a 2007 Annual Report. This report was issued by ADOT&PF and recieved on February 01, 2008. In 2007, the airport placed approximately 8 cubic yards of contaminated soil in the landspread area. Groundwater samples were collected from monitor wells MW6, MW8, MW9, MW10, and MW11. A surface water sample was collected from a drainage ditch leading to Cook Inlet. No contaminants of concern were detected in groundwater samples. In the lone surface water sample, diesel range organics were detected at a level of 1.33 mg/L. Todd Blessing
5/23/2008 Update or Other Action DEC approved of a request by Restoration Science and Engineering to tranport 40 cubic yards of potentially contaminated soil generated during the Anchorage Operation Center Terminal Connector project to the landspread area. Todd Blessing
5/27/2008 Update or Other Action DEC staff reviewed and approved a work plan for contaminated soil screening at Anchorage Operations Center and Terminal Connector, Anchorage International Airport. The work plan was prepared by Restoration Science and Engineering and dated May 23, 2008. RSE proposed to sample and analyze potentially contaminated soil that screened above background levels. A soil sample will be collected from each 50 cubic yards of potentially contaminated soil and/or 500 square feet of excavation pit dimensions. Contaminated soil will be disposed at ANC's landfarm area. Todd Blessing
5/27/2008 Update or Other Action DEC staff reviewed and approved a work plan for contaminated soil screening at Anchorage Operations Center and Terminal Connector, Anchorage International Airport. The work plan was prepared by Restoration Science and Engineering and dated May 23, 2008. RSE proposed to sample and analyze potentially contaminated soil that screened above background levels. A soil sample will be collected from each 50 cubic yards of potentially contaminated soil and/or 500 square feet of excavation pit dimensions. Contaminated soil will be disposed at ANC's landfarm area. Todd Blessing
6/3/2008 Update or Other Action In an email dated June 02, 2008 DEC approved of the mixing of 124 cubic "warm" and "hot" soil that will be treated at the landfarm. The soil orginated from the RON 7-11 construction project. Todd Blessing
4/14/2009 Update or Other Action DEC staff approved of ADOT&PF's request to reuse contaminated soil possible for the parking control building sewer relocation. Hot soil (i,e, greater than 12,500 parts per million) will be removed and treated offsite, warm soil (greater than 250 but less than 12,500 parts per million) will be re-used. Todd Blessing
7/1/2009 Update or Other Action DEC staff has completed a review of Tellus Ltd's "Sampling and Analysis Work Plan for ANC RON Parking, 12-14 Reconstruction”. The subject work plan was submitted to DEC to define procedures for identifying and treating contaminated soils encountered during the reconstruction of Remote Overnight Parking (RON) areas 12-14, which is near the North Terminal at Anchorage International Airport (ANC). Tellus, Ltd. (Tellus) proposes to field screen soils within trench excavations, within twenty-five feet of any fuel lines, associated fuel system structures, or where hydrocarbon impacts are noted. Confirmation soil samples will be collected from at least 25 percent of the field screening locations exhibiting the highest field screening results. Contaminated soil encountered will either be transported to Alaska Soil Recycling if DRO concentrations exceed 12,500 mg/kg or stockpiled for further sampling and possible disposal at ANC’s landfarm area. A final project report will be submitted to ADOT and include a site narrative, figures with sampling locations, field data, analytical laboratory data and CSP data review checklists. DEC issued a letter on July 1, 2009 approving of Tellus’ RON Parking 12-14 Reconstruction Sampling and Analysis Work Plan provided a final project report is provided to DEC 30 days within receipt of soil analytical results. Todd Blessing
1/13/2010 Update or Other Action DEC staff evaluated Mactec's "ANC Environmental Monitoring of Landspreading Areas and Temporary Soil Storage Area Spring and Fall Groundwater Monitoring and Summer Soil Sampling, 2009" in conjunction with a letter from ADOT&PF, dated January 4, 2010 describing landfarming activities over the spring and summer 2009. No contaminated soil was placed in the landspreading area in 2009. The area was tilled to a depth of 18 to 24 inches and a small amount of urea was added to the soil in area 2 to promote biodegredation. Groundwater samples were collected from Monitoring wells MW-6, MW-8, MW-9, MW-10, and MW-11. A surface water sample was colected from teh inlet of culvert near taxiway K. DRO and RRO were the only contaminants detected and in the levels of DRO and RRO in monitoring well MW-10 exceeded 18 AAC 75.345 Table C values. Groundwater was determined to flow southeast. No contaminants of concern were detected in the surface water sample. Todd Blessing
8/17/2010 Update or Other Action DEC approved of SLR's "Soil Screening, Sampling, and Classification Field Sampling Plan, Alaska Airlines Lease Lot 1A, Hangar Ramp Improvements, Ted Stevens International Airport, Anchorage, Alaska. SLR will field screen potentially contaminated soil as part of this construction project and any field screeening results above background will be stockpiled for further testing and classification as "clean", "warm", or "hot". SLR will produce daily field reports and submit those to DEC. Todd Blessing
9/27/2010 Update or Other Action DEC reviewed and approved of Tellus, Ltd's “Sampling and Analysis Plan For Post-Treatment Soil Characterization & Landspreading Program Anchorage International Airport Anchorage, Alaska“. In the subject work plan, Tellus Ltd. outlines the means and methods to characterize contaminated soil placed in AFSC’s landfarm area that was generated during construction projects at the Anchorage International Airport (ANC). Tellus proposed to establish a 30 foot by 30 foot grid plot and collect one field screening sample from each plot. Fifteen percent of the highest field screening readings will be submitted to an analytical laboratory to be analyzed for GRO, DRO, and VOCs by CSP approved methods. Analytical results will be utilized to classify soil in accordance with ANC's Soil Landspreading and Remediation Agreement Todd Blessing
6/16/2011 Update or Other Action DEC staff reviewed Mactec's "ANC Environmental Monitoring of Landspreading Area, Spring and Fall 2010." This report documented an annual groundwater sampling event at the landspreading area. Groundwater samples were collected from monitor wells MW6, MW8, MW9, MW10, and MW11 during the spring and fall to be analyzed for DRO, GRO, and BTEX. No contaminants of concern were detected in groundwater samples at levels that exceed DEC cleanup criteria. Target analytes have been consistently detected at levels below cleanup criteria from 2000 through 2010. Todd Blessing
7/19/2011 Update or Other Action Staff approved of ADOT&PF's request to stock pile the material generated from the A concourse in the landspreading area on bare ground until lab results are back. If warm, they would just spread for treatment. If hot, would pick up and transport to burner. The exception would be if the soil has fuel freely flowing from it, would go straight to burner Todd Blessing
6/7/2012 Update or Other Action DEC staff reviewed Environmental Managament Inc.'s "ANC Groundwater Monitoring Landspreading Area - Fall, 2011" report which was dated February 14, 2012. This report discussed the results of groundwater and surface water monitoring. Groundwater samples were collected from wells MW-6, and MW-8 through MW-11 (MW-9 was dry so it was not sampled). Additionally, surface water samples were collected from the southern portion of the landfarm area in a ditch. Water samples were analyzed for GRO, DRO, RRO, and BTEX. No petroleum constituents were detected at levels that exceeded 18 AAC 75.345 Table C levels. Todd Blessing
10/10/2012 Update or Other Action DEC staff reviewed URS "Stockpile/Land Farm Report, AFSC Land Farm, ANC. This report documented the sampling and analysis of the landfarm as a whole. URS collected 157 field screening samples using a PID. Based on these results, 21 analytical results were collected and analyzed for DRO and BTEX. In these samples DRO levels ranged from 360 mg/kg to 15,000 mg/kg; benzene levels ranged from nondetect to 0.735 mg/kg. Todd Blessing
3/4/2013 Report or Workplan Review - Other Sampling events at the Landspreading Area wells were conducted on June 7, 2012 and October 30, 2012 and the surface water sampling was conducted on June 25, 2012. Sampling of the Temporary Soil Storage Area was conducted on October 30, 2012. A total of six samples, plus one duplicate, were collected from the four Landspreading Area wells during the two sampling events (MW9 was dry during both events and could not be sampled). The June 7, 2012 sampling event found MW11 to have a DRO concentration of 6 mg/L, which is above the ADEC cleanup level of 1.5 mg/L, and an RRO concentration of 3.3 mg/L, which is also above the cleanup level of 1.1 mg/L. All other results for the wells sampled were below the ADEC cleanup levels for GRO, DRO, RRO and BTEX. The only detectable compound in any of the wells was RRO in concentrations less than 1 mg/kg in wells MW8, MW10 and MW11. The sample collected from the Landspread Spreading Area surface water found all results to be non-detect for all compounds tested. A duplicate was also collected from this area and was also found to be non-detect. One sample and a duplicate were collected from what was believed to be MW6 at the Temporary Soil Staging Area. All results for both samples were non-detect, including non-halogenated VOCs and chlorinated hydrocarbons. After discussion with staff from the TSAIA Environmental Section it was determined that MW7 was actually sampled instead of MW6. Future sampling events will be conducted at the actual MW6. Data pertaining to the Temporary Soil Staging Area for 2011 and 2012 should not be considered valid. Katrina Chambon
5/4/2015 Update or Other Action Reviewed the 2014 groundwater and surface water monitoring report for the landspread area and the temporary soil storage area (TSSA). At the landspread area, four wells (MW-8, Mw-9, MW-10, and MW-11) were sampled in May and October and a surface water sample was collected in May. One well, MW-6, near the TSSA was also sampled in both May and October. Samples collected in May were analyzed for DRO, GRO, RRO, and BTEX. Samples collected in October were analyzed for DRO, GRO, RRO, and BTEX. MW-6 was also sampled for VOC. None of the analytes exceeded cleanup levels and most analytes were not detected at the method detection limit. DRO was detected in every sample in concentrations above the minimum detection limit and below the limit of quantitation. Lisa Krebs-Barsis
7/24/2015 Meeting or Teleconference Held Met with the AIA environmental manager to discuss the existing landspread agreement, current landspread operations, and future of landspread agreement. Lisa Krebs-Barsis
5/18/2016 Site Visit Conducted a thorough site visit of State owned, active CSP facilities at the Anchorage International Airport. Discussed future plans to manage landfarmed contaminated soils with the Airport Environmental Manager. Suggested each year or "event" should have its own three sided bermed cell to segregate soils from different sites. When each cell is cleared for use it can simply be leveled out into the area designated for fill. Darren Mulkey
6/6/2016 Report or Workplan Review - Other Reviewed 2015 Annual Report for the AIA Landspreading Area, dated 5/25/2016. The main area tested contained soils from the former Mark Air site, Alamo, Alaska Heritage Museum and a RONS 12-14 project. All the samples from these sites met ADEC cleanup standards. The 425 cy of soil identified and tested in 2015 meet ADEC cleanup criteria and are released for use as fill on the airport property. The report noted new contamination in MW9 (DRO=4.1 ppm, RRO=1.48 ppm) for 2016. Monitor MW9 going forward to track contamination. The landfarmed stock pile from Taxiway E culvert area (with clumps of asphalt) shows elevated levels of contamination and will continue to be processed in 2016. Darren Mulkey
8/23/2016 Update or Other Action Issued a No Further Remedial Action Required letter to the ADOT on their portion of the Landfarm Area. Based on the 2015 Landfarm Area monitoring report all of the ADOT project soils were below cleanup levels. An additional pile was also release that contained small asphalt chunks from the Taxiway E Culvert Project. All of the soils were released to be spread in place to level the site and graded to facilitate drainage. Darren Mulkey
10/11/2016 Report or Workplan Review - Other Reviewed and approved the 2016 TSAIA Landspreading Work Plan. This plan will replace the previously existing agreement. Darren Mulkey
6/9/2017 Report or Workplan Review - Other Reviewed Interim Multi-Incremental Sampling Report for ASIG Land Farm prepared by AECOM, dated March 2017. MI samples were collected from six decision units (DUs). The DUs were labeled A, B, C, D, E, and F. Each DU was comprised of approximately 1,200 cubic yards (CY) of material, except for B and F with 600 CY. Samples were collected in accordance with ASIG Land Farm Sampling Work Plan dated February 17, 2016 from DUs defined in the subject work plan as well as in a January 15, 2016 Land Farm Historical Summary provided by ASIG. Ten primary samples were collected, two composites from each of A, C, D, and E and one from B and F. One of the samples from DU D was collected in triplicate. Samples were analyzed for GRO, DRO, RRO, and BTEX. Results were compared to 18 AAC 75 migration to groundwater cleanup levels. DRO was detected in all samples, and exceeded the 250 mg/kg cleanup level in one of the two DU-E composite samples, at 429 mg/kg. DRO concentrations otherwise ranged from 20.5 to 76.5 mg/kg. The highest concentrations of GRO (133 mg/kg) and RRO (1.94 mg/kg) were well below cleanup levels of 11,000 mg/kg and 300 mg/kg, respectively. BTEX compounds were either not detected or well below their respective cleanup levels of 0.022, 6.7, 0.13, and 1.5 mg/kg. Benzene was not detected. The highest reporting limit was 0.0099 mg/kg. Toluene concentrations ranged from not detected to 0.0202 mg/kg. Ethylbenzene was detected in one sample at 0.0234 mg/kg. Xylenes were detected in nine samples with concentrations ranging from 0.0228 mg/kg to 0.0525 mg/kg. Results indicated that concentrations remaining are below target cleanup levels in five of the six decision units. The exception is DU E, the southernmost DU in the land farm. Wendy Hansen
7/25/2017 Meeting or Teleconference Held DEC Staff met with ASIG and consultant AECOM to discuss status of the AFSC landspread area and path forward. A letter dated September 22, 2017 documents the meeting and subsequent communications. Multi-incremental samples were collected from the AFSC former landspread area in 2016, and analyzed for gasoline range organics (GRO), diesel range organics (DRO), residual range organics (RRO), and benzene, toluene, ethylbenzene, and xylene (BTEX). Concentrations were below ADEC 18 AAC 75.341 Method Two Migration to Groundwater cleanup levels, except for Area E with DRO at 429 milligrams per kilogram (mg/kg). ASIG plans to till the area and re-sample. Sampling will include VOCs and PAHs. Wendy Hansen

Contaminant Information

Name Level Description Media Comments
DRO Other SoilGroundwater
GRO Other SoilGroundwater
BTEX Other SoilGroundwater

Control Type

Type Details
Other Commercial and Airside Remediation Management Zones as well as the Lake Hood shoreline are not a present or future drinking water source.

Requirements

Description Details
Groundwater Use Restrictions Any drinking water wells located on AIA property must be properly abandoned in accordance with ADEC decommissioning procedures within two years of this decision. AIA shall prohibit the installation of any water wells, used for drinking, cooling, washdown, or any other purposes, on the AIA either through 17 AAC 42.410 (b) (27) of the airport leasing regulations or in their individual lease agreement documents.

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