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Site Report: MOA - AWWU Girdwood Wastewater Treatment Facility

Site Name: MOA - AWWU Girdwood Wastewater Treatment Facility
Address: Ruane Road, Girdwood, AK 99587
File Number: 2110.26.004
Hazard ID: 24753
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 60.950305
Longitude: -149.156300
Horizontal Datum:

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

Diesel contamination found during in-place closure assessment. Tank tightness testing of the dual purpose (heating oil and emergency power generation and fueling of vehicles) tank system in 1989 was inconclusive, but the fill pipe appeared to be damaged. The tank is located approximately 277 feet from a public drinking water well (located to the west). Two monitoring wells were installed near the tank in 1990 found groundwater contamination at 15 feet below ground surface. Groundwater sampling conducted in 1996 and 2011 from those two monitoring wells were non detect. Contamination was found during the in-place tank closure assessment in 1998. After contaminated soil was excavated all excavation samples met site cleanup levels. The excavated contaminated soil was thermally treated in 1998. The samples collected in 1998 near the tank were not collected deep enough to assess for potential releases from the bottom of the tank, those samples were collected in 2011. Soil and groundwater samples collected in 2011 demonstrate that the site meets cleanup levels. FKA L69.23

Action Information

Action Date Action Description DEC Staff
6/9/1989 Site Added to Database Former Staff
6/9/1989 Leaking Underground Storage Tank Cleanup Initiated - Petroleum 10.48 tons of diesel contamination excavated during in-place closure assessment. This contaminated soil was treated at ASR. Former Staff
6/9/1989 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77629 Diesel contamination found during in-place closure assessment. Tank tightness testing of the dual purpose (heating oil and emergency power generation and fueling of vehicles) tank system in 1989 was inconclusive, but the fill pipe appeared to be damaged. The tank is located approximately 277 feet from a public drinking water well (located to the west). Former Staff
10/19/1990 Site Characterization Report Approved Two monitoring wells installed. Soil and groundwater samples were collected. Up to 1.05 mg/l TPH in the groundwater on 10/19/90. Groundwater at 15 feet below ground surface. 4 soil samples were collected from each of the two soil borings. All soil samples collected were non detect (<10 mg/kg) for EPH (DRO). Monitoring well MW-01 is located about 2 to 3 feet from the south east corner of the tank, and monitoring well MW-02 is located about 6 to 7 feet away from the northwest corner of the tank. Robert Weimer
11/23/1990 Update or Other Action ADEC sends Notice of Release letter to AWWU. Robert Weimer
7/3/1996 Site Characterization Report Approved July 3, 1996 groundwater monitoring event. Depth to water was 14.8 feet below gorund surface in the two monitoring wells. The samples were <0.25 mg/l DRO, <0.10 mg/l GRO, and <1.0 ug/l benzene. This is a decrease from the previous sampling event of October 19, 1990. Robert Weimer
7/3/1996 Update or Other Action A July 23, 1999 letter mentions that groundwater samples were collected from the two on-site monitoring wells on July 3, 1996 and were non-detect for BTEX and DRO. No sampling report was submitted for that monitoring event. Robert Weimer
5/18/1998 Underground Storage Tank Site Characterization or Assessment Confirmed release on this date. Report mentions contamination below the dispenser. Diesel contamination found during in-place closure assessment. The tank was cut, cleaned, and filled with sand and gravel. Base of tank is 9.5 feet below ground surface (bgs). The deepest soil samples were only collected at 9 feet bgs. Stockpile samples had up to 2,200 mg/kg DRO and <0.028 mg/kg benzene. The two soil samples collected along the north side of the tank at 9 feet bgs, below the dispenser, and below the piping were all non detect for DRO and BTEX. Former Staff
6/1/1998 Cleanup Plan Approved ADEC approves request to thermally treat the 10.48 tons of excavated contaminated soil generated during the in-place closure assessment. Robert Weimer
12/18/1998 Update or Other Action ADEC letter sent out requesting missing information regarding in-place tank closure assessment. Former Staff
1/7/1999 Update or Other Action AWWU's consultant responds to ADEC request for additional information. Robert Weimer
7/20/1999 Update or Other Action ADEC letter that based on the information from the structural engineer that the removal of the tank would endanger the structure, ADEC will not require the removal of the tank or it may be closed in-place. ADEC letter identified that the soil sampling conducted did not meet the regulatory requirements for an in-place closure assessment (samples were not collected within 2 feet below the base of the tank and south side of tank was not sampled). ADEC requestd additional sampling at the site. Robert Weimer
1/18/2000 Update or Other Action ADEC letter requesting information on testing and repairs of tank/line system and all previous soil and groundwater sampling data for the site, including the groundwater monitoring of the two on-site monitoring wells. Robert Weimer
2/3/2000 Update or Other Action AWWU letter that there were no repairs to the tank of its piping prior to 1997. We are still missing any groundwater sampling data reports besides the 1990 sampling. Need the 1996 groundwater sampling and any other sampling events. Robert Weimer
9/29/2006 Update or Other Action File number issued 2110.26.004 (FKA L69.23). Aggie Blandford
2/13/2007 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
1/7/2011 Update or Other Action Still missing groundwater sampling reports. Contamination found near former dispenser. May need supplemental assessment work for the site assessment work that was not done during the 1998 tank closure, but there was soil samples collected when the two monitoring wells were installed in 1990. Robert Weimer
4/22/2011 Update or Other Action Call from consultant for AWWU that is putting together a plan to drill a well to 60 feet and conduct a pump test to evaluate dewatering pumping rates for planned utility upgrades in the area. The pump test would be 72 hours and about 1.8 million gallons of water. They hope to do the work in mid-May 2011. We discussed that the extent of the contamination at this site has not been defined so they may pump in contaminated water and/or may cause groundwater contamination to spread. They will need to contact the water program but the CS program will be the lead and will have additional requirements such as sampling for GRO and DRO and needing to meet drinking water levels for discharge in addition to the surface water level. Also they may need to install monitoring points in between the spill site and the pumping well to monitor for contamination migration/change in water levels. He said he would talk to AWWU and be submitting a workplan and Hart Crowser's 1/16/91 groundwater monitoring report. Robert Weimer
4/28/2011 Meeting or Teleconference Held Call from consultant for AWWU to discuss remaining site work. They will provide a copy of the 1996 groundwater monitoring report. They will have the two monitoring wells sampled soon and submit the results. We discussed that based on the results they may need to install monitoring points/monitoring wells just to the east of the tank and to the southwest of the tank. At a later date they may need to submit a plan to collect the supplemental soil data if required. Robert Weimer
5/18/2011 Site Characterization Report Approved May 3, 2011 groundwater monitoring event. Depth to water was 14.29 to 14.68 feet below gorund surface in the two monitoring wells. The samples were <0.8 mg/l DRO, <0.8 mg/l GRO, and <0.5 ug/l benzene. This is the same as the previous monitoring event. Robert Weimer
5/19/2011 Update or Other Action Received results for VOC sampling of the MOA drinking water well located about 277 feet from the tank system. All VOC's were non-detect. Robert Weimer
5/19/2011 Update or Other Action Discussed site with AWWU's consultant. They will talk to AWWU about having soil samples collected so we can close out the LUST site and not require petroleum monitoring or sampling for the proposed well pumping. We discussed they would need two borings or test pits to collect one soil sample at each at between 9.5 and 11.5 feet below ground surface. The soil samples are to be analyzed for BTEX, GRO, and GRO, with the one most contaminated sample also analyzed for PAHs. Robert Weimer
6/7/2011 Update or Other Action Based on these sample results that show that the soil and groundwater meet default cleanup levels, the Contaminated Site Program of DEC has no concerns or requirements regarding the proposed pump test on the property in 2011. Robert Weimer
6/7/2011 Site Characterization Report Approved On May 25, 2011 two soil borings were drilled next to the diesel tank that was closed in-place in 1989. A soil sample was collected from each soil boring at 9.5 to 10.5 feet below ground surface. Up to 3.06 mg/kg GRO, 21.9 mg/kg DRO, <0.015 mg/kg benzene, and 0.0071 mg/kg benzo(g,h,i)perylene. All soil samples meet default cleanup levels. The site is recommended for cleanup complete status contingent on properly decommissioning the two monitoring wells. Robert Weimer
6/8/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77629 diesel UST based on recent soil and groundwater sampling. Robert Weimer
11/18/2011 Update or Other Action ADEC contacted AWWU requesting documentation that the two monitoring wells have been properly decommissioned. Robert Weimer
11/18/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77629 diesel UST. Robert Weimer
3/6/2012 Update or Other Action Notification from consultant that the two monitoring wells are to be abandoned the summer of 2012. Robert Weimer
6/19/2013 Update or Other Action AWWU provided documentation that the monitoring wells we decommissioned on 9/4/12. Robert Weimer
6/20/2013 Cleanup Complete Determination Issued Jacob Gano

Contaminant Information

Name Level Description Media Comments
GRO < Method 2 Most Stringent SoilSoilSoil
DRO < Method 2 Most Stringent Soil
Benzene < Method 2 Most Stringent Soil

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.

There are no documents for this site report.

No associated sites were found.

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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Physical Location: 410 Willoughby