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Site Report: MOA - AWWU - Anchorage Headquarters bldg.

Site Name: MOA - AWWU - Anchorage Headquarters bldg.
Address: 3000 Arctic Blvd.; , Anchorage, AK 99503
File Number: 2100.26.314
Hazard ID: 23990
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.192259
Longitude: -149.899461
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

Removal of two gasoline and one diesel UST on April 13, 1993. Holes were found in the bottoms of the two gasoline tanks. Later in April 1993 630 tons of contaminated soils were excavated and thermally treated. In 1993 contaminated soil was identified at the base of the excavation (up to 0.606 mg/kg benzene, and 0.212 mg/kg Tetrachloroethylene - PCE), and fuel sheens and product were found on the shallow groundwater (8 feet below ground surface) in the northern and central portion of the excavation. A groundwater sample was collected from a test pit 20 feet to the east and was non-detect, but groundwater is estimated to flow to the west or northwest. Site Characterization work conducted in June/July 2010. They drilled eight soil borings, seven to 15 feet below ground surface (bgs) and one to 32 feet bgs (at the solvent contaminated area) to help determine the thickness of the shallow aquifer, but no confining layer was encountered within 32 feet of the ground surface. Three of the boring will be completed as long term monitoring wells. Depth to groundwater ranged between 7.40 to 8.11 feet bgs. Soil and groundwater samples will be collected to help characterize the level and extent of any remaining soil and groundwater contamination at the site. One soil sample exceeded default cleanup levels (MW3) it had 0.032 mg/kg benzene, non-detect DRO, non-detect RRO, non-detect GRO, all other VOC and HVOC were non-detect. The contamination was detected in only 1 of 3 monitoring wells (MW3), it had 9.32 ug/l benzene, non-detect DRO, non-detect mg/l RRO, non-detect GRO, and non-detect other VOCs. The remaining soil and groundwater contamination appears to be in a localized area on property near monitoring well MW3.

Action Information

Action Date Action Description DEC Staff
4/14/1993 Site Added to Database Former Staff
4/14/1993 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77961 Gasoline contamination found in soil and groundwater. Holes found in two gasoline tanks, product and sheens on groundwater (8 feet below ground surface). Tetrachloroethylene (PCE) contamination found in one soil sample. Former Staff
4/15/1993 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Harding & Lawson still excavating contaminated soils from UST hole. Former Staff
4/20/1993 Update or Other Action Cleanup continues, Notice of Release letter sent. Former Staff
8/23/1993 Release Investigation Partial release investigation conducted during removal of tank and some contaminated soil. Contaminated soil and groundwater remain at the site. The extent of the soil and groundwater contamination has not been defined. Robert Weimer
8/23/1993 Underground Storage Tank Site Characterization or Assessment Removal of two gasoline and one diesel UST. Contaminated soil remains at the base of the excavation, and sheens and product on shallow groundwater (8ft below ground surface). ADEC noted soil contamination remains over cleanup levels, requested tank sludge receipts, and groundwater investigation. Former Staff
8/24/1993 Leaking Underground Storage Tank Corrective Action Underway 630 tons of contaminated soils were excavated and thermally treated. Robert Weimer
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: ANCH. WATER & WASTEWATER UTILITY Former Staff
1/13/2004 Update or Other Action Called RP (AWWU) requesting information requested in the 8/23/93 ADEC letter. Robert Weimer
11/1/2006 Update or Other Action File number issued 2100.26.314 (FKA L69.42). Aggie Blandford
4/2/2008 Update or Other Action Left message with RP (AWWU) requesting status on the requested investigation of the site. Robert Weimer
4/2/2008 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
5/1/2008 Update or Other Action Talked with RP (AWWU) they are currently reviewing their files and will submit any additional information they find by May 15, 2008. We discussed that if they don't have documentation that additional work was conducted at the site to define the extent of the soil and groundwater contamination and that the cleanup was completed, that they will need to do it. Robert Weimer
10/21/2008 Update or Other Action Discuss site with RP's consultant. They will review AWWU files to look for any additional information and submit a workplan to characterize the extent of the remaining soil and ground water contamination. Robert Weimer
5/14/2010 Update or Other Action Teleconference with AWWU and their consultant (BGES) to discuss future site work. BGES will provide a workplan for conducting a release investigation to define the extent of the remaining soil and groundwater contamination and to conduct quarterly groundwater monitoring for at least 1 year. 10% of the samples will need EDB, 1,2-DCA, PAH, and MTBE analysis. Robert Weimer
6/2/2010 Document, Report, or Work plan Review - other Teleconference with AWWU's consultant (BGES) to discuss the proposed workplan for conducting a release investigation to define the extent of the remaining soil and groundwater contamination. They will provide a revised workplan that includes soil samples from each boring at soil/water interface and the highest field reading is that is at a differnt depth; and moving the furthest northwest boring to the former tank #3 location, with soil and groundwater samples collected at that location. Robert Weimer
6/3/2010 Document, Report, or Work plan Review - other DEC approves the June 3, 2010 Revised Site Characterization Work Plan. The work plan call for drilling eight soil borings, seven to 15 feet below ground surface (bgs) and one to 25 feet bgs (at the solvent contaminated area) to help determine the thickness of the shallow aquifer. Some of the boring will be completed as temporary or permanent monitoring wells. Soil and groundwater samples will be collected to help characterize the level and extent of any remaining soil and groundwater contamination at the site. Robert Weimer
6/8/2010 Update or Other Action Discussed with AWWU's consultant (BGES) the workplan for conducting a release investigation to define the extent of the remaining soil and groundwater contamination. They plan to use a geo probe rig to collect soil samples, then they will over-drill with a drill rig to install monitoring wells. Robert Weimer
8/24/2010 Offsite Soil or Groundwater Disposal Approved Review and approve request for transport and disposal at Municipal Landfill of 3 drums of contaminated drill cuttings generated during the June 2010 release investigation work. Robert Weimer
6/16/2011 Update or Other Action ADEC approves request that during the next groundwater monitoring event to conduct analysis for BTEX only. Robert Weimer
7/18/2011 Offsite Soil or Groundwater Disposal Approved ADEC approved request to dispose of monitoring well purge water in the AWWU sanitary sewer. The purge water meets AWWU standards for disposal. Robert Weimer
11/3/2011 Offsite Soil or Groundwater Disposal Approved ADEC approved request to dispose of monitoring well purge water in the AWWU sanitary sewer. The purge water meets AWWU standards for disposal. Robert Weimer
11/30/2011 Site Characterization Report Approved Site Characterization work conducted in June/July 2010. They drilled eight soil borings, seven to 15 feet below ground surface (bgs) and one to 32 feet bgs (at the solvent contaminated area) to help determine the thickness of the shallow aquifer, but no confining layer was encountered within 32 feet of the ground surface. Three of the boring will be completed as long term monitoring wells. Depth to groundwater ranged between 7.40 to 8.11 feet bgs. Soil and groundwater samples will be collected to help characterize the level and extent of any remaining soil and groundwater contamination at the site. One one soil sample exceeded method 2 cleanup levels (MW3) it had 0.032 mg/kg benzene, non-detect (<22.8 mg/kg) DRO, non-detect (<57.0 mg/kg) RRO, non-detect (<2.18 mg/kg) GRO, all other VOC and HVOC were non-detect. The contamiantion was detected in only 1 of 3 monitoring wells (MW3), it had 9.32 ug/l benzene, non-detect (<0.385 mg/l) DRO, non-detect (<0.385 mg/l) RRO, non-detect (<0.100 mg/l) GRO, and non-detect other VOCs. Robert Weimer
11/30/2011 Conceptual Site Model Submitted Robert Weimer
6/12/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77961 1993 UST sytem removal. Robert Weimer
9/17/2013 Document, Report, or Work plan Review - other June 29, 2011 groundwater monitoring event. Up to 7.24 ug/l benzene in the samples collected. Goundwater concentrations increased in 0 of 3 monitoring wells sampled. Depth to groundwater was between 7.55 and 8.34 feet below ground surface. Groundwater flow direction was to the northwest. Robert Weimer
9/18/2013 Document, Report, or Work plan Review - other October 22, 2011 groundwater monitoring event. Up to 11.4 ug/l benzene in the samples collected. Goundwater concentrations increased in 1 of 3 monitoring wells sampled. Depth to groundwater was between 7.58 and 8.37 feet below ground surface. Groundwater flow direction was to the northwest. Robert Weimer
9/19/2013 Document, Report, or Work plan Review - other March 10, 2012 groundwater monitoring event. Up to 10.7 ug/l benzene in the samples collected. Goundwater concentrations increased in 0 of 3 monitoring wells sampled. Depth to groundwater was between 8.18 and 8.97 feet below ground surface. Groundwater flow direction was to the northwest. The monitoring wells were purged prior to sampling with a bladder pump. Robert Weimer
9/20/2013 Document, Report, or Work plan Review - other September 22, 2012 groundwater monitoring event. Up to 9.69 ug/l benzene in the samples collected. Goundwater concentrations increased in 0 of 3 monitoring wells sampled. Depth to groundwater was between 6.20 and 6.80 feet below ground surface. Groundwater flow direction was to the northwest. The monitoring wells were purged prior to sampling with a bladder pump. Robert Weimer
9/20/2013 Update or Other Action DEC approves request to suspend sampling for BTEX in monitoring wells MW-1 and MW-2. Robert Weimer
8/25/2014 Update or Other Action DEC requests that complete copies of field notes be included with the monitoring reports. The field notes and the report need to document that the groundwater samples were collected after purging, and the sample interval was within the top 1 foot of water in the monitoring well during sampling. The volatile sampling needs to be done with a sampling method that minimizes the loss of volatiles (such as an in-well pump or bladder pump). Robert Weimer
10/1/2014 Offsite Soil or Groundwater Disposal Approved ADEC approved request to dispose of monitoring well purge water in the AWWU sanitary sewer. The purge water meets AWWU standards for disposal. Robert Weimer
5/4/2015 Document, Report, or Work plan Review - other September 29, 2013 groundwater monitoring event. 2.92 ug/l benzene in the sample collected. Goundwater concentrations decreased in the 1 monitoring well sampled (MW-3). Robert Weimer
5/4/2015 Document, Report, or Work plan Review - other August 30, 2014 groundwater monitoring event. 5.47 ug/l benzene in the sample collected. Groundwater concentrations increased in the one monitoring well sampled (MW-3). Depth to groundwater was between 6.39 and 7.61 feet below ground surface. Groundwater flow direction was to the northeast. The monitoring well was purged prior to sampling with a whale pump and collected near the surface of the water column. Robert Weimer
5/4/2015 Document, Report, or Work plan Review - other November 22, 2014 groundwater monitoring event. 4.12 ug/l benzene in the sample collected. Groundwater concentrations decreased in the one monitoring well sampled (MW-3). Depth to groundwater was between 7.17 and 8.04 feet below ground surface. Groundwater flow direction was to the northwest. The monitoring well was purged prior to sampling with a whale pump and collected near the surface of the water column. Robert Weimer
5/12/2015 Meeting or Teleconference Held Meeting with consultant. Topics included suspending sampling for Wells MW-1 and M-2 due to continued non-detect results. Quarterly sampling of MW-3 only. During the first event if samples do not contain VOC results greater than ADEC Table C cleanup levels, consultant will request to sample for BTEX only. Lisa Griswold
2/2/2016 Document, Report, or Work plan Review - other Quarterly groundwater monitoring work plan approved. Plan includes details on sampling MW-3. If first round of samples do not contain VOCs above ADEC cleanup levels, consultant will request to sample for BTEX only for remaining sampling. Sampling events were originally planned for January, April, July, and October, but will now be February, May, August and November. Lisa Griswold
5/20/2016 Document, Report, or Work plan Review - other March 2016 Groundwater Monitoring S&W Data Package approved on this date. First quarter groundwater monitoring event indicates benzene above ADEC Table C cleanup levels (.00590 mg/L). Volatile Organic Chemicals (VOCs) were detected but below ADEC cleanup levels. ADEC approved the data package, the suspension of VOC testing for the remainder of monitoring events, and the disposal of three gallons of purge water to the wet well at AWWU Pump Station 12. Lisa Griswold
7/21/2016 Document, Report, or Work plan Review - other June 2016 Groundwater Monitoring, 3000 Arctic Boulevard Data Package approved. Benzene was detected above ADEC Table C cleanup levels at 0.00728 mg/L in MW-3. All other contaminants were non-detect. Lisa Griswold
11/4/2016 Document, Report, or Work plan Review - other September 2016 Groundwater Monitoring 3000 Arctic Boulevard, Anchorage, Alaska Data Package and the disposal of 3 gallons of purge/decon water to the wet well at AWWU Pump Station #12 approved on this date. MW3 continues to contain benzene above ADEC cleanup levels at 0.00677 mg/L. Toluene was detected but below ADEC cleanup levels, while Ethylbenzene and Xylenes were not detected. Lisa Griswold
2/8/2017 Document, Report, or Work plan Review - other 2016 quarterly groundwater monitoring report approved on this date. The report details the monitoring events completed in March, June, September and December 2016. MW-1 and MW-2 were used for groundwater depth only in accordance with the 2013 request to suspend sampling, while MW-3 was sampled during each event. In accordance with the approved work plan, a request for suspension of VOC sampling was granted after the March 2016 event indicated that all VOCs were non-detect. In June 2016, it was noted that well MW-2 and MW-3 were frost jacked, and were repaired in August 2016. In September, a new level loop survey was completed in order to ascertain groundwater flow direction, which appears to be west to slightly south west. During each of the sampling events, the only contaminant above ADEC cleanup level was benzene. The sampling of MW-3 yielded benzene levels in March, June, September and December of 5.90 µg/L; 7.28 µg/L; 6.77 µg/L, and 4.13 µg/L respectively. All except the December sampling event were above ADEC cleanup level of 4.6 µg/L. This report, and disposal of the purge/decon water to the wet well at pump station 12 is approved with the following comment: On page 32 of the report, the low-flow sampling log for MW-3 on December 7, 2016 is missing the depth to the pump in the well. Future site actions is to be subject of meeting between ADEC and AWWU on February 13, 2017. Lisa Griswold
2/13/2017 Meeting or Teleconference Held Meeting with RP and consultant held on this date. Items discussed included a path forward to closure. Consultant is to submit a work plan to insure contamination has been bounded. Lisa Griswold
4/14/2017 Document, Report, or Work plan Review - other Work plan for additional site characterization activities approved on this date. The work plan indicates that one boring- PB9 will be drilled and completed as a monitoring well down gradient from MW-3 in regard to a presumed groundwater flow direction of directly west in an attempt to fill data gaps in order to evaluate the site for cleanup complete with institutional controls. This work plan is approved with the following comments: 1)If the investigative derived waste does not contain contaminants above ADEC cleanup levels, AWWU should filter the water and spread the soil and water at least 100 feet away from any drinking water wells, and/or surface water as outlined in ADEC’s 2016 Field Sampling Guidance. 2)If ADEC concludes that data gaps still persist following the completion of work outlined in the work plan; more characterization or further sampling events may be needed before the site is eligible for closure. Lisa Griswold
5/12/2017 Update or Other Action Letter sent to RP notifying of site management transfer to Rodman. Lisa Griswold
5/12/2017 Update or Other Action Site transferred to Rodman Lisa Griswold
3/29/2018 Site Characterization Report Approved The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) reviewed the “Additional Site Characterization Activities, 3000 Arctic Boulevard, Anchorage, Alaska” (report) dated February 13, 2018 for the MOA - AWWU - Anchorage Headquarters bldg. site in Anchorage, AK. The report was submitted via email on March 5, 2018 by Shannon & Wilson, Inc. (Shannon & Wilson). The described field effort was conducted on September 21, October 4, and December 20, 2017 and generally consisted of advancing soil borings, installing a groundwater monitoring well, collecting groundwater samples from groundwater monitoring wells, collecting a soil sample, and conducting a groundwater monitoring wells survey. Amy Rodman
6/15/2018 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77961 1993 UST sytem removal. Amy Rodman
6/15/2018 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77961 1993 UST sytem removal. Amy Rodman
7/25/2018 Update or Other Action Emailed RP and consultant, granted permission to decommission MW3 and MW4. Amy Rodman
8/9/2018 Update or Other Action Groundwater monitoring well decommissioning report approved. Report approval letter emailed and mailed to RP and consultant. Site is being evaluated for closure. Amy Rodman
9/6/2019 Institutional Control Record Established Institutional Controls established and entered into the database. Amy Rodman
9/11/2019 Cleanup Complete Determination Issued Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and no further remedial action will be required unless new information becomes available that indicates residual contaminants may pose an unacceptable risk. Amy Rodman
9/11/2019 Institutional Control Record Removed Institutional Controls have been removed. Amy Rodman

Contaminant Information

Name Level Description Media Comments
Tetrachloroethene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Benzene < Table C Groundwater
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
No ICs Required

Requirements

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

No associated sites were found.

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
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Phone: 907-465-5066
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