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Site Report: AWWU Operations Facility 1999 Used Oil Tank removal


Site Name: AWWU Operations Facility 1999 Used Oil Tank removal
Address: 325 East 94th Court, Also listed as 503 East 94th Court, Anchorage, AK 99502
File Number: 2100.26.331
Hazard ID: 24744
Status: Active
Staff: Amy Rodman, 9074655368 amy.rodman@alaska.gov
Latitude: 61.135968
Longitude: -149.873710
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 1999 removed 300 gal used oil tank and piping and contaminated soil. Some contaminated soil was transported off property and later retrieved. Contaminated soil stockpiled on-site and later treated at ASR. In November 2000 four monitoring wells were installed and a replacement monitoring well was installed in 2004. Groundwater was encountered between 6 and 11.5 feet below ground surface. All remaining soil and groundwater contamination appears to be confined to the 503 E. 94th Court property.

Action Information

Action Date Action Description DEC Staff
10/12/1999 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Contamination found during the removal of a 300 gallon used oil tank and its associated piping. Up to non-detect (<1.70 mg/kg) GRO, 20.3 mg/kg DRO, 70.7 mg/kg RRO, non-detect (<0.00813 mg/kg) benzene, non-detect (<0.0388 mg/kg) PCBs, 3.46 mg/kg arsenic, 32.0 mg/kg chromium, 10.5 mg/kg lead, and non-detect for HVOCs. The arsenic and chromium concentrations appear to be naturally occuring. The 130 cubic yards (cy) of soil was excavated during the tank removal and 1,010 cy of potentially contaminated soil from a nearby water line/dry well excavation need characterization samples. Groundwater was encountered at 7 to 8 feet below ground surface and had a petroleum odor and sheen. An excavation water sample collected from the the new dry well excavation had 1.7 mg/l DRO, and 0.8 mg/l RRO. An excavation water sample from the water line excavation had 3.6 mg/l DRO, and 15 mg/l RRO. Robert Weimer
10/12/1999 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 78079 (Added by System) Robert Weimer
10/12/1999 Site Added to Database * Not Assigned
1/12/2000 Report or Workplan Review - Other On January 12, 2000 soil samples were collected from three test pits 10 to 40 feet to the southeast of the existing warm storage building, three test pits about 200 feet to the northeast of the building, and samples from a stockpile of soil that was excavated during the contruction of the building. The stockpile is located 250 feet northeast of the building. Robert Weimer
1/28/2000 Underground Storage Tank Site Characterization or Assessment Site assessment report submitted Robert Weimer
5/15/2000 Update or Other Action ADEC requests work plans for release investigation, stockpile sampling, and stockpile treatment. 1,140 cubic yards of potentially contaminated soil was excavated during the removal of the UST (130 cy) and the installation of a new water line and dry well (1,010 cy). Robert Weimer
9/27/2000 Update or Other Action Conditional approval of requests for transport contaminated soil from 79th and Hartzell Road. Robert Weimer
10/30/2000 Release Investigation Conditional approval of release investigation workplan. Robert Weimer
11/21/2000 Site Characterization Report Approved On November 16, 2000, 4 soil borings were drilled and completed as monitoring wells. Up to non-detect (<0.09 mg/l) GRO, non-detect (<0.326 mg/l) DRO, 0.773 mg/l RRO, and non-detect (<0.5 ug/l) in the groundwater. Depth to groundwater was 6 to 11.5 feet below ground surface. No analytical soil samples were collected from the borings. Stockpile samples were collected. 1,140 cy of stockpile meets default cleanup levels except for Arsenic and Chromium which appear to be at naturally occuring concentrations. An additional 130 cy of stockpile to be treated at ASR. All water samples meet cleanup levels. Monitoring well #4 later accidentally destroyed. Tanks, piping, liquid, and sludges were properly disposed of. The consultant recommends quarterly groundwater monitoring to establish trends/seasonal fluctuations. Robert Weimer
11/22/2000 Update or Other Action Contaminated soil successfully removed from 79th and Hartzell Road where the stockpiles had been transported to. Robert Weimer
11/23/2000 Report or Workplan Review - Other On November 16, 2000 a 5th boring/monitoring well installed to the north of the building to investigate a 1991 concrete/asphalt fill area. The soil and groundwater contamination does not appear to be related to the former UST. Depth to groundwater was 5.4 feet below ground surface. Up to 1.39 mg/l RRO, 0.93 mg/l DRO, non-detect (<0.09 mg/l) GRO, and 0.742 ug/l benzene in the groundwater. One soil sample was collected at the soil/water interface had 631 mg/kg DRO, 1,590 mg/kg RRO, 5.65 mg/kg GRO, and non-detect (<0.008 mg/kg) benzene. Robert Weimer
2/21/2001 Report or Workplan Review - Other February 21, 2001 groundwater sampling event. Up to 0.40 mg/l DRO, non-detect (<0.09 mg/l) GRO, and non-detect (<0.595 mg/l) RRO in the samples collected. Concentrations increased in 1 of 3 monitoring wells sampled. Depth to groundwater was 6.27 to 7.70 feet below ground surface. Groundwater flow direction was to the south by southwest. Robert Weimer
5/14/2001 Report or Workplan Review - Other May 14, 2001 groundwater sampling event. Groundwater samples had non-detect (<0.526 mg/l) DRO, non-detect (<0.09 mg/l) GRO, and non-detect (<1.05 mg/l) RRO in the samples collected. Concentrations increased in 0 of 4 monitoring wells sampled. Depth to groundwater was 3.36 to 8.07 feet below ground surface. Groundwater flow direction was to the west by northwest. Robert Weimer
8/30/2001 Report or Workplan Review - Other August 30, 2001 groundwater sampling event. Groundwater samples had non-detect (<0.568 mg/l) DRO, non-detect (<0.09 mg/l) GRO, and non-detect (<1.14 mg/l) RRO in the samples collected. Concentrations increased in 0 of 4 monitoring wells sampled. Depth to groundwater was 4.28 to 12.04 feet below ground surface. Groundwater flow direction was to the northwest. Robert Weimer
11/1/2004 Update or Other Action Consultant confirmed that last sampling conducted in 2001. Robert Weimer
1/11/2007 Update or Other Action File number issued 2100.26.331 (FKA L69.85). Aggie Blandford
6/16/2008 Exposure Tracking Model Ranking 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
3/6/2013 Update or Other Action ADEC sent email request to AWWU for reports or correspondence with DEC that AWWU has for this facility. Robert Weimer
11/5/2015 Report or Workplan Review - Other The November 14, 2000 Removal of Stockpiled Soil and Surface Characterization Report, 79th Avenue and Hartzell Road, Poor Boy Construction Yard, Anchorage, Alaska was reviewed on this date. The report indicates that the soil disturbed by the delivery, storage, and removal of stockpiled soil from the AWWU Operations Facility 1999 Used Oil Tank Removal site did not contain concentrations of Diesel Range Organics, and Residual Range Organics above ADEC clean up levels, and Gasoline Range Organics, Benzene, Toluene, Ethylbenzene, total Xylenes and Halogenated Volatile Organics were not present above laboratory reporting limits. Lisa Griswold
11/5/2015 Update or Other Action ADEC requested the consultant complete a round of sampling on ground water monitoring well 5 (B5MW) in order to evaluate possible residual contamination on the property. Lisa Griswold
1/4/2016 Report or Workplan Review - Other Monitoring Well Installation and Sampling Work Plan, 503 East 94th Court, Anchorage, Alaska reviewed on this date. The work plan details plans to advance a boring and complete it as a monitoring well in the vicinity of B5MW which could not be located in a November 25, 2015 site visit, and is assumed to be destroyed. The four other monitoring wells at other locations on the property had non-detect concentrations, or concentrations of gasoline range organics, residual range organics, diesel range organics and BTEX below ADEC cleanup levels at the last sampling event in 2001. Lisa Griswold
2/19/2016 Update or Other Action Transport of <55 gallons of contaminated soil to Columbia Ridge landfill by NRC approved. Lisa Griswold
4/11/2016 Report or Workplan Review - Other Monitoring Well Installation and Sampling report approved on this date. Report details the drilling and installation of a new B5MW. Up to 1,980 mg/Kg Diesel Range Organics (DRO) and 4,630 mg/Kg Residual Range Organics (RRO) remains in soil. Gasoline Range Organics (GRO) (32.4 mg/Kg J) and total xylenes (0.651 mg/Kg) were detected but are below ADEC cleanup levels. Ethylbenzene (0.157 mg/Kg) was also detected but is below 2008 ADEC cleanup levels. DRO (.952 mg/L), RRO (0.256 mg/L J), benzene (0.000240 mg/L J), toluene (0.000360 mg/L J)and total xylenes (0.000560 mg/L J) were detected but below ADEC cleanup levels. GRO (<0.05 mg/L) and Ethylbenzene (<0.0005 mg/L) were non-detect in groundwater. Lisa Griswold
4/11/2016 Site Characterization Workplan Approved Site Characterization approved on this date. Site characterization is being completed to delineate the contamination discovered in the new B5MW and consists of up to 12 borings being drilled 20 feet north, south, east and west of the well advanced to approximately 10 feet bgs. ADEC approved of this site characterization contingent upon field notes and a conceptual site model being submitted along with the report. Lisa Griswold
6/23/2016 Report or Workplan Review - Other Review of May 2001 GW sampling event for B5MW reviewed on this date. B5MW contained 2.16 mg/L Residual Range Organics (RRO) and 1.67 mg/L Diesel Range Organics (DRO) which are both above ADEC cleanup levels of 1.5 mg/L for DRO, and 1.1 mg/L RRO. Lisa Griswold
6/28/2016 Report or Workplan Review - Other Site Characterization report approved on this date. Site characterization indicated that up to 1,630 mg/Kg Diesel Range Organics in soil. The consultant indicated that based on these results a site cleanup work plan was going to be developed. Due date for this work plan is August 29, 2016. Lisa Griswold
10/25/2016 Update or Other Action Inquired with consultant regarding status of cleanup plan. Lisa Griswold
10/26/2016 Update or Other Action ADEC approved extension of cleanup plan submittal date. Cleanup plan to be submitted by December 30, 2016. Lisa Griswold
2/1/2017 Update or Other Action ADEC approved extension of cleanup plan submittal date. Cleanup plan to be submitted by April 3, 2017. Lisa Griswold
5/11/2017 Update or Other Action Letter sent to RP to ask the cleanup plan be submitted as soon as possible as it was now past due and to inform that project management was being transferred to Rodman. Lisa Griswold
5/11/2017 Update or Other Action Site transferred to Rodman Lisa Griswold

Contaminant Information

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