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Site Report: Frontier Construction (formerly)

Site Name: Frontier Construction (formerly)
Address: 8001 Petersburg St.; , Anchorage, AK 99507
File Number: 2100.26.148
Hazard ID: 24133
Status: Cleanup Complete
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 61.147947
Longitude: -149.844757
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

A 10,000 gallon used oil tank was removed in 1991. BTEX, DRO, and TPH (RRO) contamination found in the soil and groundwater. Some tetrachloroethylene (PCE) was found in the excavated soil but not detected in the groundwater. An inch of used oil product was observed on the groundwater in the excavation. Product and contaminated water were recovered from the excavation. Monitoring wells were installed in 1993. Further excavation of contaminated soil was conducted in 1994. A 1 to 2 foot thick layer of oil stained soil was observed on top of the groundwater on the east, west, and south sidewalls of the excavation. Excavated contaminated soil was placed in an on-property biocell and was successfully remediated. Another (a 300 gallon) used oil tank was closed in place under the building in 1995, that area meets site soil cleanup levels. Based on soil sampling data showing that soils meet default cleanup levels, a conditional closure letter was issued on November 15, 1999 for the 1991 used oil and diesel tank releases. A drinking water well search conducted in 1999 identified one drinking water well as close as 800 feet to the southwest at 8240 Petersburg Street. Groundwater exceeds cleanup levels in the on-property monitoring wells and a condition of the closure is that semi-annual groundwater monitoring is to be conducted. No groundwater sampling has been conducted since the conditional closure letter was issued in 1999. Groundwater flow direction varies seasonally to the northwest, west, and southwest. Depth to groundwater varies from 3 to 12 feet below ground surface. During the last groundwater monitoring event in July/October 1999 monitoring wells B1MW had 2.93 mg/l DRO, B3MW had 1.75 mg/l, and B8MW had 1.58 mg/l. They attempted to sample the monitoring wells in 2004 and found that all three monitoring wells had frost jacked. Monitoring wells B1MW and B3MW were blocked with bentonite, and monitoring well B8MW had surface snow melt running into the well. In 2012 the existing monitoring wells were decommissioned in accordance with an approved plan. L55.135

Action Information

Action Date Action Description DEC Staff
11/6/1991 Site Added to Database Former Staff
11/6/1991 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 76772 Petroleum contaminant. Former Staff
11/7/1991 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU Date changed DB conversion Former Staff
11/12/1991 Update or Other Action Notice of release letter sent. Former Staff
11/24/1992 Underground Storage Tank Site Characterization or Assessment Shannon & Wilson report dated December 1991 (received October 1992). Excavation show high level of used oil contamination (TPH & BTEX) in soil and groundwater. Stockpiles on-site. Requested corrective action. Former Staff
4/27/1993 Document, Report, or Work plan Review - other Three monitoring wells (B1MW, B2MW, and B3MW) were installed to the northwest, southwest, and east of the tank excavation. B1MW soil sample collected at 2.5 to 4 feet below ground surface (bgs) had 2,390 mg/kg TPH, rest of the boring soil samples met site cleanup levels. Monitoring wells B1MW and B2MW have a screened interval between 5 and 15 bgs, B3MW has a sceened interval between 6 and 16 feet bgs. Groundwater was encountered between 7.96 and 8.98 feet bgs. Groundwater samples collected at that time were below site cleanup levels. Plan to place excavated contaminated soils in bioremediation cell. Some horse manure mixed in for fungi to help break down heavy ends (RRO). Plan to excavate out remaining stained soils in the former tank excavation. Robert Weimer
1/26/1994 Leaking Underground Storage Tank Corrective Action Underway 250 cubic yards of used oil contaminated soils excavated from smear zone at groundwater in July 1993. Some benzene contamination remain. Total of 580 cubic yards of contaminated soil remain stockpiled on-site, 520 cubic yards of it in a biocell. On October 8, 1993 groundwater monitoring had up to 120 ug/l benzene (monitoring well B2MW). Former Staff
3/2/1995 Document, Report, or Work plan Review - other Reviewed a site assessment for used oil tank under building. Some contamination found that will need a release investigation. Former Staff
7/25/1995 Document, Report, or Work plan Review - other Reviewed a quarterly report and stockpile treatment status. Former Staff
7/31/1995 Document, Report, or Work plan Review - other July 31, 1995 groundwater monitoring event. Up to <1.0 mg/l TPH (1.0 mg/l is the cleanup level) and 3.2 ug/l benzene (5 ug/l is the cleanup level) in the groundwater. Highest concentrations in monitoring well B2MW. Groundwater flow direction was to the west by northwest. Depth to groundwater was 6.35 to 7.03 feet below ground surface. Robert Weimer
11/6/1995 Document, Report, or Work plan Review - other November 6, 1995 groundwater monitoring event. Up to 3 mg/l TPH (1.0 mg/l is the cleanup level) and <0.5 ug/l benzene (5 ug/l is the cleanup level) in the groundwater. Groundwater flow direction was to the west by southwest. Depth to groundwater was 3.33 to 7.08 feet below ground surface. Robert Weimer
1/8/1996 Document, Report, or Work plan Review - other January 8, 1996 groundwater monitoring event. Up to 2.52 mg/l DRO (1.5 mg/l is the cleanup level) and 2 ug/l benzene (5 ug/l is the cleanup level) in the groundwater. Highest concentrations in monitoring well B3MW. Groundwater flow direction was to the northwest. Depth to groundwater was 10.4 to 12.9 feet below ground surface. Robert Weimer
7/2/1996 Document, Report, or Work plan Review - other July 2, 1996 groundwater monitoring event. Up to 4.54 mg/l DRO (1.5 mg/l is the cleanup level) in the groundwater. Highest concentrations in monitoring well B1MW. Concentrations increased in 2 of the 3 monitoring wells sampled. Robert Weimer
11/21/1996 Document, Report, or Work plan Review - other Reviewed a release investigation report. Based on the results ADEC approved in-place tank closure. Former Staff
7/16/1997 Document, Report, or Work plan Review - other July 16, 1997 groundwater monitoring event. Up to 1.1 mg/l DRO (1.5 mg/l is the cleanup level) in the groundwater. Highest concentrations in monitoring well B3MW. Concentrations decreased in 3 of the 3 monitoring wells sampled. Robert Weimer
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: ALLIANCE BANK Former Staff
1/19/1998 Document, Report, or Work plan Review - other January 19, 1998 groundwater monitoring event. Up to 1.49 mg/l DRO (1.5 mg/l is the cleanup level) in the groundwater. Highest concentrations in monitoring well B2MW. Concentrations increased in 2 of the 2 monitoring wells sampled. Robert Weimer
7/16/1998 Document, Report, or Work plan Review - other July 22, 1998 groundwater monitoring event. Up to 1.74 mg/l DRO (1.5 mg/l is the cleanup level) in the groundwater. Highest concentrations in monitoring well B3MW. Concentrations increased in 2 of the 3 monitoring wells sampled. Robert Weimer
7/22/1999 Document, Report, or Work plan Review - other July 22, 1999 groundwater monitoring event. Up to 2.93 mg/l DRO (1.5 mg/l is the cleanup level) in the groundwater. Highest concentrations in monitoring well B1MW. Concentrations increased in all of the monitoring wells sampled. Monitoring well B8MW that was installed in the former used oil UST excavation was sampled for the first time had 1.58 mg/l DRO, 0.792 mg/l RRO. Robert Weimer
8/27/1999 Update or Other Action ADEC approves on-site landspreading of the treated cell soils. Based on the July 27, 1999 soil sampling the cell soils meet site cleanup levels. Robert Weimer
10/13/1999 Document, Report, or Work plan Review - other On October 13, 1999 four soil borings were sampled and one monitoring well (B8MW) was installed and sampled. All soil samples were below default cleanup levels for BTEX, GRO, DRO, and PAHs. The groundwater sample collected from B8MW was below default cleanup levels for PAHs, BTEX, and GRO. DRO was detected at 1.58 mg/l and RRO was 0.792 mg/l. Robert Weimer
10/15/1999 Document, Report, or Work plan Review - other October 15, 1999 groundwater monitoring event. Up to 1.58 mg/l DRO (1.5 mg/l is the cleanup level) in the groundwater in the one monitoring well sampled B8MW. Robert Weimer
11/15/1999 Conditional Closure Approved ADEC approves no further remedial action for soils. Request for long term semi-annual DRO groundwater monitoring of monitoring wells B1MW, B3MW, and B8MW. During the last groundwater monitoring event B1MW had 2.93 mg/l DRO, B3MW had 1.75 mg/l, and B8MW had 1.58 mg/l. B8MW has only been sampled once. Robert Weimer
11/15/1999 Institutional Control Record Established Institutional control set for remaining DRO contamination in the groundwater. Robert Weimer
11/17/1999 Update or Other Action Talked with RP. We discussed that because the groundwater exceeds cleanup levels for DRO they need to continue to have a qualified impartial 3rd party to sample the groundwater on a semi-annual basis for DRO and prepare an annual report of the sampling results. Robert Weimer
10/16/2003 Update or Other Action Have not received any groundwater monitoring results since October 1999. Talked with RP. He will have his consultant sample the groundwater as per the November 11, 1999 ADEC letter and submit the results. Robert Weimer
12/2/2004 Long Term Monitoring Established Still waiting for results of the semi-annual groundwater monitoring (monitoring wells B1MW, B3MW, and B8MW). Conditional Closure had been granted in 1999 for the soil, but groundwater contaminant concentrations (up to 2.93 mg/l DRO) still exceed cleanup levels (1.5 mg/l DRO). Robert Weimer
11/21/2005 Update or Other Action Talked with RP, he will forward copy of 2004 sampling letter. (RP - 8001 Petersburg, LLC) Robert Weimer
11/21/2005 Update or Other Action ADEC receives copy of September 24, 2004 letter requesting conditional closure status for the groundwater at the 8001 Petersburg Street site. The letter noted that they attempted to sample the monitoring wells on May 7, 2004 but found that all three monitoring wells had frost jacked. Two of the monitoring wells (B1MW and B3MW) were blocked with bentonite and the third monitoring well (M8MW) had snow melt water flowing into the monitoring well (B8MW). No groundwater samples were collected. The letter recommends decommissioning the monitoring wells and not using the groundwater as a potable water source. Robert Weimer
11/22/2005 Update or Other Action Monitoring of site groundwater needs to continue. Existing monitoring wells may need to be repaired or replaced. Robert Weimer
1/5/2006 Update or Other Action Input site in the Institutional Control tracking module. Robert Weimer
8/12/2008 Update or Other Action Sent email and left phone message with RP requesting copies of any site work or sampling that has been conducted since 2004. Need to sample monitoring wells B1MW, B3MW, and B8MW. If those wells are not in a condition to be sampled, they may need to be repaired or replaced. The monitoring wells have not been sampled since July/October 1999. A condition of the November 15, 1999 no further remedial action letter for soils required long term semi-annual DRO groundwater monitoring of monitoring wells B1MW, B3MW, and B8MW. Robert Weimer
4/12/2012 Update or Other Action Discussed site status with RP. DEC is not currently requesting any futher groundwater monitoring. RP will contact his consultant to have all of the site monitoring wells be properly decommissioned and submit documentation. Following that DEC plans to issue a revised closure letter. Robert Weimer
4/12/2012 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 76772 name: autogenerated pm edit - Frontier Construction (formerly) Robert Weimer
5/4/2012 Document, Report, or Work plan Review - other ADEC approves work plan to decommission all of the site monitoring wells. Documentation is to be provided within 2 weeks of decommissioning. Robert Weimer
6/26/2012 Document, Report, or Work plan Review - other ADEC receives documentation that decommission all of the site monitoring wells has been completed. Robert Weimer
9/21/2012 Update or Other Action Staff changed from Robert Weimer to IC Unit. Kristin Thompson
3/27/2013 Institutional Control Record Removed The conditions at this site meet the 2009 closure policy, therefore ICs can be removed. All groundwater monitoring requirements have been met and the wells have been decommissioned. The default requirement of no offsite transport of soil or groundwater will still apply. In accordance with 18 AAC 78.276(f)(2), ADEC may require additional site assessment, monitoring, remediation, and/or other necessary actions at this facility should new information become available that indicates contamination at this site may pose a threat to human health or the environment. Evonne Reese
3/27/2013 Long Term Monitoring Complete Administrative action on 5/1/2013. Kristin Thompson
3/27/2013 Institutional Control Compliance Review IC review conducted. Evonne Reese

Contaminant Information

Name Level Description Media Comments
DRO < Table C Groundwater

Control Type

Type Details
No ICs Required

Requirements

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

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
TDD: 800-770-8973
Physical Location: 410 Willoughby