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Site Report: MOA Northwood Maintenance Facility Garage Bay 6

Site Name: MOA Northwood Maintenance Facility Garage Bay 6
Address: 5701 Northwood Drive, Anchorage, AK 99502
File Number: 2100.38.536
Hazard ID: 25942
Status: Active
Staff: Dawn Wilburn, 9072628200 dawn.wilburn@alaska.gov
Latitude: 61.168628
Longitude: -149.927008
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 July 2001, during the installation of an oil/water separator, a dry well and associated petroleum-contaminated soil were encountered. A total of seven soil samples were gathered, six primary and one duplicate. Soil samples were analyzed for gasoline (GRO), diesel (DRO), and residual range organics (RRO), volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), and metals. Analytes above ADEC cleanup levels include GRO, DRO, napthalene, acenaphthene, and fluorene. The extent of the contamination is not defined; approximately 110 tons of contaminated soil were taken to Alaska Soil Recycling (ASR) for thermal treatment.

Action Information

Action Date Action Description DEC Staff
11/13/2012 Site Added to Database A new site has been added to the database Mitzi Read
11/19/2012 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79359 name: Garage Bay 6 Dry Well Mitzi Read
11/26/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79359 Garage Bay 6 Dry Well. Katrina Chambon
12/4/2012 Potentially Responsible Party/State Interest Letter Katrina Chambon
1/14/2013 Document, Report, or Work plan Review - other MOA provided DOWL's August 20, 2001 report for the removal of the Former Dry Well. The DOWL report shows the results for the samples collected in 2001. The east base of the excavation at a depth of about 10 feet below the slab (Sample 1) had diesel range organics (DRO), tetrahlorethylene (PCE), 1,4-Dichlorobenzene and 1,2-Dichlorobenzene exceeded the cleanup levels. The north sidewall at a depth of about 7 feet below the slab (Sample 3) had gasoline range organics (GRO), DRO, PCE, 1,2,4-Trimethylbenzene, 1,4-Dichlorobenzene, and 1,2-Dichlorobenzene exceeded the cleanup levels. Sample 5 from the south sidewall at a depth of about 7 feet below the slab had 1,4-Dichlorobenzene exceeding the cleanup levels. The Dry Well may have been hooked up to a restroom. The Former Dry Well is situated beneath the Maintenance Building slab at the site. This building is surrounded by the International Airport Road (IAR) Landfill. Refuse from the landfill was reportedly excavated and replaced with gravel to provide a competent bearing soil on which to construct the building. MOA, requested that ADEC accepts the results from groundwater samples collected from surrounding landfill wells to document that there is not widespread groundwater contamination of PCE, 1,4-Dichlorobenzene, and 1,2-Dichlorobenzene and to allow the remaining contaminants be remediated by monitored natural attenuation. Katrina Chambon
1/15/2013 Update or Other Action Request for Work Plan for MOA Northwood Maintenance Facility Garage Bay 6. CSP request that a temporary groundwater well be constructed approximately 15 to 20 feet southwest of the Garage Bay (i.e., closely down-gradient from the UIC well and outside of the building between wells IAL43 and IAL9). This is based on the groundwater flow documented by SLR’s Landfill Water Quality Monitoring Program Round 2 of 2012 Monitoring Report dated March 2012. Soil samples and groundwater samples need to be analyzed for diesel range organics (DRO), gasoline range organics (GRO), and volatile organic carbons (VOCs). Once these confirmation samples are collected, CSP may consider this site for closure. Katrina Chambon
5/27/2015 Meeting or Teleconference Held Met with RP representative and consultant to discuss path forward for site and requested a work plan. Lisa Krebs-Barsis
8/14/2018 Document, Report, or Work plan Review - other The ADEC has reviewed the 2014 “Northwood Street Maintenance Facility”. As discussed in the meeting the ADEC has no objections to using this plan for the 2018 sampling event, provided that VOCs by EPA method 8260C and PAHs by EPA method 8270D are added to the analytes sampled. Chelsy Passmore
11/15/2018 Site Characterization Workplan Approved The ADEC has reviewed the "Work Plan to Conduct Site Assessment Activities Northwood Maintenance Facility...". The work plan details the installation of one soil boring and monitoring well, conducting soil and groundwater monitoring and the management of investigation derived waste. Groundwater is noted to be at approximately 20-25ft bgs. The ADEC has no objections to the work plan. Work is currently scheduled for 2019. Chelsy Passmore
11/15/2018 Site Characterization Workplan Approved The ADEC has reviewed the "Work Plan to Conduct Site Assessment Activities Northwood Maintenance Facility...". The work plan details the installation of one soil boring and monitoring well, conducting soil and groundwater monitoring and the management of investigation derived waste. The ADEC has no objections to the work plan. Chelsy Passmore
6/13/2019 Update or Other Action ADEC has reviewed the 2019 Transport, Treatment & Disposal Approval form and has no objections Chelsy Passmore
8/8/2019 Site Characterization Report Approved The ADEC reviewed the "Site Assessment Northwood Maintenance Facility" Report. Field activities consisted of advancing one soil boring, completing that boring as a monitoring well, and collecting soil and groundwater samples. Groundwater contained vinyl chloride at a level of 0.72ug/L above the ADEC Table C cleanup level of .19ug/L. Soil did not contain contaminant concentrations above ADEC cleanup levels. Chelsy Passmore
6/2/2021 Update or Other Action In email from ADEC to MOA and Shannon and Wilson on June 2, 2021: The ADEC proposes that the soils be characterized vertically and horizontally in both the northern and southern areas, and that the groundwater pathway be evaluated through groundwater grab samples via temporary monitoring wells (most likely for both areas; feel free to make your proposal). Some soil data has been obtained, please explain known contaminated soil characterization within proposed work plan. Please portray the information in the narrative of the work plan and on a site map. ADEC is unaware on what work the MOA had planned for the adjacent site. It is ADEC's understanding that the MOA is trying to contract cleanup work for both sites under a single proposal. Jessica Hall
7/8/2021 Site Characterization Workplan Approved ADEC sent the RP approval on the Revised Work Plan For Groundwater Monitoring, 5701 Northwood Drive, Anchorage, Alaska; Adec File No. 2100.38.536, dated July 6, 2021. Potential seasonal variations in contaminant concentrations in Well B1MW will be evaluated. Two groundwater sampling events will be conducted and laboratory analysis of the groundwater samples. Jessica Hall
7/8/2021 Document, Report, or Work plan Review - other Sent RP comments on the Work Plan for Groundwater Monitoring, 5701 Northwood Drive, Anchorage, Alaska; ADEC File No. 2100.38.536, Dated June 22, 2021. Requested and updated work plan be submitted to ADEC for approval. Jessica Hall
11/15/2021 Site Characterization Workplan Approved Sent RP approval letter for Revised Work Plan for Groundwater Monitoring, 5701 Northwood Drive, Anchorage, Alaska; ADEC File No. 2100.38.536, Dated July 6, 2021. Groundwater sampling event will evaluate potential seasonal variations in contaminant concentrations in Well B1MW. One sample and one duplicate sample will analyzed for DRO, RRO, PAHs, and VOCs. Jessica Hall
12/1/2021 Update or Other Action Requested site update for the July and October 2021 GW sampling events. A report should be submitted shortly. Jessica Hall
12/6/2021 Update or Other Action Per email from Shannon & Wilson dated 16/6/2021 July and October 2021 Sampling events were conducted, and the site sampling report is going through internal review. They plan to forward the report to MOA this week, and to ADEC shortly thereafter. Jessica Hall
1/18/2022 Risk Assessment Report Approved ADEC sent the RP an approval letter for the “Groundwater Monitoring Report”, dated January 12, 2022. Jessica Hall
2/28/2022 Document, Report, or Work plan Review - other ADEC sent the RP comments on work plan dated February 3, 2022. Requested and updated work plan be submitted for review. Jessica Hall
3/21/2022 Risk Assessment Workplan Approved ADEC sent RP approval letter for “Additional Site Characterization Activities Work Plan”, dated March 14, 2022. Jessica Hall
10/3/2024 Site Characterization Report Approved Approved the "Additional Site Characterization Activities" report dated July 2022. In 2022, two soil borings were advanced northwest and southwest of monitoring well B1MW and converted to monitoring wells . Samples were collected and analyzed for DRO, RRO, VOCs, and PAHs. DRO (328 mg/kg), benzene (0.0299 mg/kg), ethylbenzene (0.339 mg/kg), and naphthalene (0.0699 mg/kg) were detected above the DEC migration to groundwater (MTG) cleanup levels in the primary soil sample from boring B2. DRO and RRO exceeded the DEC groundwater cleanup levels in B1MW (DRO only) and B3MW. Vinyl chloride was detected above the cleanup level in all wells. Dawn Wilburn

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details
Hazard ID Site Name File Number
3305 MOA - Maintenance Facility Northwood Drive 2100.38.141
23968 MOA - Northwood Maintenance Facility 2100.26.383

Missing Location Data

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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
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