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Site Report: Alaska Housing Authority - Willow Park Housing

Site Name: Alaska Housing Authority - Willow Park Housing
Address: 9th Ave. & Fairbanks St.; , Anchorage, AK 99501
File Number: 2100.26.332
Hazard ID: 23890
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 61.213838
Longitude: -149.874193
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

Soil & groundwater contamination present in removal of 5 underground storage tanks. 2 tanks are gasoline-500 gallons each, 1 heating oil-750 gallons, 2 with bunker C at 7000 gallons each. Contamination from an upgradient former Chevron station (event ID 164) extends under this site. Chevron monitors this site as part of their groundwater monitoring program. FKA L73.02

Action Information

Action Date Action Description DEC Staff
10/15/1990 Site Added to Database Former Staff
10/15/1990 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 78083 ADD; Former Staff
10/16/1990 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; :LCAU Date changed DB conversion Former Staff
12/28/1990 Release Investigation SI; Shannon & Wilson sent underground storage tank removal monitoring report for site. S-50 1320 ppm TPH, up to 24.6 ppm arsenic, 177.7 ppm chromium, 19.3 ppm lead. Recommend that groundwater be pumped, treated & disposed of using collection gallery as a recovery well, conduct well inventory & risk assessment from contaminated groundwater, quarterly groundwater monitoring wells. Former Staff
12/28/1990 Leaking Underground Storage Tank Corrective Action Underway REM; ASHA desires to dispose of stockpile S-45 to S-49, S-51 to S-53 at Hiland rd. landfill of 225 cubic yards of waste soils. 85 tons in S-50 by first processing at AK Pollution Control calciner in Palmer then to the landfill. Receipts from landfill scale house for waste soils will be presented to DEC. Former Staff
1/25/1991 Offsite Soil or Groundwater Disposal Approved REM; Quest Environmental submits request for disposal of soil from waste soil stockpiles. S-50 earlier reported to have elevated chromium levels was found to have actual chromium levels within ambient background levels. Northern Testing Lab. had an autosampler malfunctioning & inaccurately diluting samples with high values. So S-50 to go to Anchorage Sand & Gravel after DEC approval. Former Staff
2/26/1991 Update or Other Action MS; Letter requesting submittal of groundwater quality monitoring plan, including schedule for collecting water level measurements & water quality samples & interim reports by 3/29/91. Water well inventory be conducted & results be sent to DEC no later than 3/15/91. Requesting groundwater treatment plan or qualitative risk assessment plan be sent not later than 3/29/91. Former Staff
3/6/1991 Document, Report, or Work plan Review - other MS; AK State Housing sent in well survey/monitoring well results. Benzene results pending but no chromium was found in water table from 4 wells sampled. 10 parcels with possible wells were located within 1320' radius of site. 4/24/91 ASHA benzene analysis received with 20700 ppb benzene being the upper level from MW-4 & MW-3 having none detected. Former Staff
3/15/1991 Document, Report, or Work plan Review - other MS; AK State Housing authority sent in water well inventory within 1,320' of site. 16 properties may have either a commercial or residential well. Former Staff
7/12/1991 Document, Report, or Work plan Review - other MS; AK State Housing Authority sent in quarterly monitoring well sampling from Quest Environmental. Well 4 had 20500 ppb EPA602, well 1 & 2 had 10 ppm, well 3 non detectable contamination. Groundwater flow has been supported by data collected by RZA & Alaskan Consulting Surveyors, Inc. show it frm the south east. Again it is suggested that "... contaminants within the ground water (is) migrating from a source other than the subject site." Former Staff
7/16/1991 Offsite Soil or Groundwater Disposal Approved REM; Soil treatment/disposal documents received by DEC. There has been additional soil removed from area of former underground storage tank. Former Staff
8/19/1991 Offsite Soil or Groundwater Disposal Approved REM; Anchorage Sand & Gravel sent in receipts from 923.63 tons of fuel contaminated soils. Analysis of the remediated soils was attached & blended with AC-5 for use as black base material. Former Staff
12/1/1991 Update or Other Action Willow Park Housing buildings demolished and land is completely reverted back to cemetery use. Amy Rodman
1/1/1992 Underground Storage Tank Site Characterization or Assessment SA1R; Former Staff
5/16/1996 Update or Other Action All soil meets site cleanup levels, only gw contamination remain, which may be from upgradient former Chevron station. Former Staff
10/16/2003 Update or Other Action Site being monitored by Chevron due to groundwater contamination from the upgradient former gas station. Robert Weimer
8/26/2004 Update or Other Action Site continues to be monitored by Chevron due to groundwater contamination from the upgradient former gas station. Robert Weimer
10/13/2005 Update or Other Action Site continues to be monitored by Chevron due to groundwater contamination from the upgradient former gas station. Robert Weimer
5/10/2006 Document, Report, or Work plan Review - other May 10, 2006 groundwater monitoring event by Chevron. Up to 390 ug/l benzene and 2.3 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in the two monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 22.19 to 26.04 feet below ground surface. Robert Weimer
9/21/2006 Document, Report, or Work plan Review - other September 21, 2006 groundwater monitoring event by Chevron. Up to 260 ug/l benzene and 1.4 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in one of the two monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 21.19 to 24.99 feet below ground surface. Robert Weimer
2/26/2007 Update or Other Action File number issued 2100.26.332 (FKA L73.02). Aggie Blandford
5/17/2007 Document, Report, or Work plan Review - other May 17, 2007 groundwater monitoring event by Chevron. Up to 210 ug/l benzene and 0.8 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in one of the two monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 21.60 to 25.45 feet below ground surface. Robert Weimer
9/26/2007 Document, Report, or Work plan Review - other September 26, 2007 groundwater monitoring event by Chevron. Up to 110 ug/l benzene and 0.3 mg/l GRO in the one on property monitoring well sampled (MW-15). The other on property wells could not be located/have been abandoned. The concentrations decreased in the one monitoring well sampled. Groundwater flows to the northwest. Depth to groundwater was 21.85 feet below ground surface. Robert Weimer
5/15/2008 Document, Report, or Work plan Review - other May 15, 2008 groundwater monitoring event by Chevron. Up to 140 ug/l benzene and 0.6 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in one of the two monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 21.74 to 25.59 feet below ground surface. Robert Weimer
6/23/2008 Update or Other Action Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. Robert Weimer
6/23/2008 Exposure Tracking Model Ranking Intitial Ranking Complete for Source Area: 78083 (Autogenerated Action)
9/16/2008 Document, Report, or Work plan Review - other September 16, 2008 groundwater monitoring event by Chevron. Up to 120 ug/l benzene, 0.6 mg/l GRO, and 1.1 mg/l DRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations decreased in the two monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 21.77 to 25.60 feet below ground surface. Robert Weimer
5/26/2009 Document, Report, or Work plan Review - other May 26, 2009 groundwater monitoring event by Chevron. Up to 130 ug/l benzene and 0.36 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in the two monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 22.01 to 25.86 feet below ground surface. Robert Weimer
5/14/2010 Document, Report, or Work plan Review - other May 14, 2010 groundwater monitoring event by Chevron. Up to 230 ug/l benzene and 1.3 mg/l DRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in 1 of the 2 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 22.05 to 25.90 feet below ground surface. Robert Weimer
9/15/2010 Document, Report, or Work plan Review - other September 15, 2010 groundwater monitoring event by Chevron. Up to 180 ug/l benzene and 1.1 mg/l DRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in the 1 of the 2 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 22.10 to 25.99 feet below ground surface. Robert Weimer
1/4/2011 Document, Report, or Work plan Review - other September 14, 2009 groundwater monitoring event by Chevron. Up to 210 ug/l benzene and 0.5 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in the two monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 22.19 to 26.04 feet below ground surface. Robert Weimer
1/4/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78083 1990 UST contamination based on current site conditions. Robert Weimer
4/7/2011 Document, Report, or Work plan Review - other April 7, 2011 groundwater monitoring event by Chevron. Up to 35 ug/l benzene, 0.16 mg/l DRO, and 0.62 mg/l GRO in the one on property monitoring well sampled (MW-15). The other on property wells could not be located/have been abandoned. The concentrations decreased in the one monitoring well sampled. Groundwater historically flows to the northwest. Depth to groundwater was 22.86 feet below ground surface. Robert Weimer
8/30/2011 Document, Report, or Work plan Review - other August 30, 2011 groundwater monitoring event by Chevron. Up to 440 ug/l benzene, 6.8 mg/l DRO, and 2.3 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in the two monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 22.82 to 26.49 feet below ground surface. Robert Weimer
10/28/2011 Update or Other Action Site continues to be monitored by Chevron due to groundwater contamination from the upgradient former gas station. Robert Weimer
5/14/2012 Document, Report, or Work plan Review - other May 14, 2012 groundwater monitoring event by Chevron. Up to 190 ug/l benzene, 4.8 mg/l DRO, and 2.4 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in the two monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 22.00 to 25.79 feet below ground surface. Robert Weimer
9/27/2012 Document, Report, or Work plan Review - other September 27, 2012 groundwater monitoring event by Chevron. Up to 78 ug/l benzene, 0.88 mg/l DRO, and 0.43 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations decreased in the two monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 21.57 to 25.45 feet below ground surface. Robert Weimer
5/22/2013 Document, Report, or Work plan Review - other May 22, 2013 groundwater monitoring event by Chevron. Up to 15.9 ug/l benzene, 0.106 mg/l DRO, and 1.0 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in 1 of the 2 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 21.26 to 25.08 feet below ground surface. Robert Weimer
6/28/2013 Site Visit Site visit to observe current site conditions. Robert Weimer
9/4/2013 Document, Report, or Work plan Review - other September 4, 2013 groundwater monitoring event by Chevron. Up to 46.4 ug/l benzene, 0.632 mg/l DRO, and 0.59 mg/l GRO in the two on property monitoring well sampled (MW-15 and WPHC-1). The other on property wells could not be located/have been abandoned. The concentrations increased in 1 of the 2 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 21.10 to 24.95 feet below ground surface. Robert Weimer
1/30/2014 Update or Other Action Project manager changed to Amy Dieffenbacher, file transferred to Juneau Annie Ariel
3/20/2014 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78083 1990 UST contamination. Amy Rodman
4/22/2014 Update or Other Action Phone conversation with RP (Municipality of Anchorage) regarding condition of groundwater monitoring wells around administration building. MW2 not found, possibly "absorbed" into landscaping and last accessed by Arcadis (for Chevron) in September 2002. MW4 is outside gate and was last accessed in May 2002 by Arcadis. MW3 has new cover and was last sampled by Arcadis in 1993. Manhole cover over collection gallery still there. Amy Rodman
5/28/2014 Potentially Responsible Party/State Interest Letter PRP Notification letter mailed and emailed out. Amy Rodman
6/4/2014 Cleanup Complete Determination Issued Amy Rodman
6/4/2014 Institutional Control Record Established Amy Rodman
6/16/2014 Potentially Responsible Party/State Interest Letter PRP letter mailed to Alaska Housing Finance Corporation. Amy Rodman
8/5/2014 Update or Other Action Received Appendix A (Cleanup Complete with Institutional Control's Agreement and Signature Page)from closure letter with signature from Municipality of Anchorage employee. Also received is copy of quit claim deed stating Alaska Housing Finance Corporation's responsibility with respect to site's contamination. Copy of document in file folder. Amy Rodman
5/21/2018 Institutional Control Compliance Review Staff changed from Amy Rodman to IC Unit. IC compliance review conducted. Closure/IC Details updated to reflect the institutional controls outlined in the 2014 Cleanup Complete with Institutional Controls Determination. An ICs Verification letter was issued. Reminder system set for future follow-ups to occur every three years. Kristin Thompson
8/22/2022 Institutional Control Compliance Review IC compliance review conducted on this date and an IC reminder letter was issued to the responsible party. The next review will be in three years' time. Evonne Reese

Contaminant Information

Name Level Description Media Comments
DRO > Human Health/Ingestion/Inhalation Soil
Benzene > Table C Groundwater groundwater contamination since 1990 is from offsite and upgradient source. see "associated sites."
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
DRO > Table C Groundwater groundwater contamination is also from offsite and upgradient source. see "associated site."
Toluene < Table C Groundwater
Toluene < Method 2 Most Stringent Soil
Ethylbenzene < Table C Groundwater
Ethylbenzene < Method 2 Most Stringent Soil
Xylenes (total) < Table C Groundwater
Xylenes (total) < Method 2 Most Stringent Soil
GRO < Table C Groundwater

Control Type

Type Details
Signed CS Determination

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site. Standard condition.
Groundwater Use Restrictions ADEC approval is required prior to installation of groundwater wells.
When Contaminated Soil is Accessible, Remediation Should Occur Subsurface soil contamination is located at the base of the collection gallery, directly above the confining clay layer (~25 feet below ground surface) and also at a depth of 14 feet in one location. When the soil becomes accessible, or should excavation and construction in the former area of the cleanup occur, the soil must be evaluated and contamination addressed in accordance with an ADEC-approved workplan.
Other MOA shall report to ADEC when land use or ownership changes.
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.
Other Standard condition.
Periodic Review ADEC will conduct a review of site conditions every three years.
Hazard ID Site Name File Number
23994 Chevron - #2555 2100.26.004

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State of Alaska Department of Environmental Conservation

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