Skip to content
Back to Top

Site Report: AFSC Former Cross-town Pipeline, 1600 C Street release


Site Name: AFSC Former Cross-town Pipeline, 1600 C Street release
Address: 1600 C Street, W of C & N of Chester Cr., Anchorage, AK 99503
File Number: 2100.38.439
Hazard ID: 593
Status: Active
Staff: Wendy Hansen, 9072693059 wendy.hansen@alaska.gov
Latitude: 61.205433
Longitude: -149.887746
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

Jet A fuel pipeline leak discovered during leak test in 1989. During the line repair 20 cubic yards of contaminated soil was removed and subsequently thermally treated. One 20 inch product recovery well was installed in 1989. A total of 127.6 gallons of product was recovery from the well. The groundwater and soil is contaminated. In 1999 fuel the water at the recovery well had a strong fuel odor. Further investigation work was conducted in 2000. Up to 1150 mg/l DRO, 66.8 mg/l GRO, and .109 mg/l benzene was found in the groundwater. Up to 2300 mg/kg DRO and .115 mg/kg benzene was found in the soil. Groundwater is at 3.7 to 5.9 below ground surface. Need to define the extent of the remaining soil and groundwater contamination, and to determine what corrective action is needed for the remaining contamination. West of C Street and North of Chester Creek. The pipeline was decommissioned in 1999 after the new pipeline along the tidal flats was brought into service in May 1999. Signature’s decommissioned pipelines, including this one, are cleaned out and maintained for possible future use.

Action Information

Action Date Action Description DEC Staff
1/19/1989 Site Added to Database An unknown amount of Jet fuel leaked from two pin holes in the pipeline at this location. Leak detected during line pressure test. No Longer Assigned
7/2/1990 Update or Other Action To date 127.6 gallons of Jet A have been recovered from the recovery well. Robert Weimer
4/24/1996 Site Ranked Using the AHRM Ranked by Shannon and Wilson. S&W
12/8/1997 Site Ranked Using the AHRM Site reranked by staff. Changed Environmental/Recreation Area Value from 2 to 0. Bill Petrik
12/10/1999 Update or Other Action Reviewed file to determine status and whether additional action is needed. CSRP will draft a letter requesting additional characterization. Eileen Olson
1/28/2000 Meeting or Teleconference Held Met with Signature environmental representative to discuss site status and the need for characterization of groundwater and soil contamination. Eileen Olson
9/6/2000 Site Characterization Workplan Approved Sent letter conditionally approving "Work Plan for Soil and Groundwater Sampling, 16th Avenue and C Street Pipeline Release." Eileen Olson
1/8/2001 Update or Other Action Received "Report for Soil and Groundwater Sampling, 16th Avenue and C Street Pipeline Release" dated December 28, 2000. Up to 1,150 mg/l DRO, 66.8 mg/l GRO, and .109 mg/l benzene was found in the groundwater. Up to 2,300 mg/kg DRO and 0.115 mg/kg benzene was found in the soil. The report recommends monthly checks for product in the recovery well, installing additional groundwater monitoring wells to help define the extent of the groundwater contamination, and to collect upgradient soil data. Eileen Olson
11/3/2004 Update or Other Action Formerly CS92.28 File number issued: 2100.38.439 Aggie Blandford
2/17/2005 Update or Other Action Called RP's rep (LB) and discussed site status. She said that they have been checking for product, but no other work has been done. She will have her replacement submit by the end of March 2005 a workplan to install monitoring wells and collect soil and groundwater samples. Robert Weimer
5/27/2005 Meeting or Teleconference Held Meeting to discuss future site work. To meet out at the site next week to discuss monitoring well locations. Recommend that monitoring wells be moved to the south and west. Because of limited funding this year ASIG proposes to limit the work this year to the installation of 3 monitoring wells and groundwater sampling. They will submit a revised workplan for the installation of 3 monitoring wells. We discussed that they will need additional confirmation soil samples prior to closure of the site. We also discussed that additional release investigation and/or corrective action may be needed in the future. Robert Weimer
6/9/2005 Meeting or Teleconference Held Meeting at the site to discuss location of monitoring wells. They are to install 2 just to the southwest of the middle and southern end of the trench, and two more monitoring wells in the trees about 30 feet southwest from the first two wells. The recovery well had a fuel odor. Robert Weimer
7/8/2005 Update or Other Action ADEC approves workplan to install and sample 4 monitoring wells to help define the extent of the groundwater contamination. Robert Weimer
9/14/2005 Update or Other Action Discussed site with ASIG. Reviewed site access documents for the downgradient church property. Robert Weimer
9/15/2005 Meeting or Teleconference Held Meeting with downgradient church property owner to discuss site access for the placement of two monitoring wells on their property. Robert Weimer
9/18/2006 Update or Other Action November 21, 2005 Groundwater Assessment Report. Two monitoring wells were installed on 9/29/05. Up to 10 ug/l benzene, 2.2 mg/l DRO, and 0.698 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. Groundwater was encountered at 8 feet below ground surface. Robert Weimer
5/16/2007 Update or Other Action July 31, 2006 groundwater monitoring event. Two monitoring wells were installed on 9/29/05. Up to 9 ug/l benzene, 1.35 mg/l DRO, and 0.223 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. Groundwater was encountered at 8 feet below ground surface during the previous sampling event. Robert Weimer
5/16/2007 Update or Other Action Review and approve workplan for decommissioning the product recovery well. The two monitoring wells are to be sampled for BTEX, GRO,and DRO. Robert Weimer
6/17/2008 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
7/23/2008 Update or Other Action June 12, 2007 groundwater monitoring event. Up to 9 ug/l benzene, 26.6 mg/l DRO, and 0.694 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. These concentations increase over the previous monitoring event. Groundwater was encountered at 8 feet below ground surface during a previous sampling event. The site recovery well was abandoned on June 12, 2007. 40 pounds of ORC advanced was placed in the recovery well before it was capped with bentonite clay. Robert Weimer
7/23/2008 Update or Other Action ADEC approves workplan to sample monitoring wells MW-4 and MW-5 on an annual basis for BTEX, GRO, and DRO. The next groundwater sampling event is scheduled for July 25, 2008. Robert Weimer
9/15/2008 Report or Workplan Review - Other July 25, 2008 groundwater monitoring event. Up to 11 ug/l benzene, 1.9 mg/l DRO, and 0.14 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. The concentation of benzene increased but the DRO and GRO decreased from the previous monitoring event. Depth to groundwater was 4.48 to 5.18 feet below ground surface. Robert Weimer
8/16/2010 Report or Workplan Review - Other June 23, 2009 groundwater monitoring event. Up to 11 ug/l benzene, 1.66 mg/l DRO, and 0.24 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. The concentation of DRO increased but the GRO decreased from the previous monitoring event. Depth to groundwater was 4.50 to 5.30 feet below ground surface. Because DRO was found in monitoring well MW-4 on June 23, 2009, the sample was re-analyzed in the lab and the monitoring well was resampled on September 4, 2009 and was found to be non detect. Robert Weimer
10/6/2011 Site Characterization Report Approved June 16, 2010 groundwater monitoring event. Up to 30.1 ug/l benzene, 1.8 mg/l DRO, and 1.09 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. The concentation of benzene, GRO, and DRO increased from the previous monitoring event. Depth to groundwater was 3.1 to 5.0 feet below ground surface. A strong fuel odor was noted in monitoring well MW-5. The consultant recommends continued annual groundwater monitoring. Robert Weimer
3/12/2013 Site Visit Site visit to observe current site conditions. Robert Weimer
7/1/2013 Report or Workplan Review - Other July 27, 2012 groundwater monitoring event. Up to 13.6 ug/l benzene, 1.3 mg/l DRO, and 0.48 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. The concentation of benzene, GRO, and DRO decreased from the previous monitoring event. Depth to groundwater was 4.49 to 5.42 feet below ground surface. A strong fuel odor and light sheen was noted in monitoring well MW-5. The consultant recommends continued annual groundwater monitoring. Robert Weimer
9/16/2015 Report or Workplan Review - Other August 19, 2014 groundwater monitoring event. Up to 8.0 ug/l benzene, 1.0 mg/l DRO, and 0.28 mg/l GRO in the groundwater. The highest contamination concentrations were found near the free product recovery well. The concentation of benzene, GRO, and DRO decreased from the previous monitoring event. Depth to groundwater was 4.63 to 5.62 feet below ground surface. Product was noted in monitoring well MW-5, but was not measurable. The groundwater samples were collected with using peristaltic pump after purging. Because of the loss of volatiles using a peristaltic pump the BTEX and GRO results are considered biased low. Because the sample interval was not documented to be as close as possible to the soil/water interface as required the BTEX, GRO, and DRO results are considered biased low. Robert Weimer
7/6/2016 Update or Other Action Based on the historical data at this site dating back to 2005, the sample results for Monitoring Well #4 (MW-4) have not indicated the presence of any contaminants of concern above method detection limits or were detected at levels well below the ADEC Table C Groundwater Cleanup Levels (18 AAC 75.345). Based on this information, groundwater monitoring from MW-4 is no longer required. MW-5 will remain under the August 13, 2014 requirements for biennial groundwater sampling and reporting. Darren Mulkey
9/22/2016 Report or Workplan Review - Other Received the July 19, 2016 groundwater monitoring report. MW-5 is the only well remaining that requires monitoring. During the sampling event no LNAPL was observed in MW-5. A sample and one duplicate were collected from MW-5 and tested for BTEX, GRO and DRO. Benzene was the only contaminant of concern that was detected exceeding ADEC Table C groundwater cleanup levels at 11.8 ug/L. Darren Mulkey
7/12/2017 Meeting or Teleconference Held DEC staff met with ASIG A. Tuttle and consultant Ahtna Environmental, Inc. to discuss status and path forward. Biennial groundwater monitoring is currently conducted at this site. Currently this includes one well, MW-5. The last sampling event was conducted in 2016. Benzene was the only constituent above cleanup levels for the third consecutive event, at a concentration of 0.0115 mg/L with a stable trend indicated. The report, dated September 21, 2016, recommended monitoring be extended to every 5 years. ASIG needs to demonstrate that the nature and extent of contamination in the groundwater has been delineated to include VOCs and PAHs. A work plan will be submitted for 2017 to include sampling for VOCs and PAHs. Wendy Hansen
10/17/2017 Report or Workplan Review - Other DEC staff reviewed a work plan submitted by Ahtna Engineering Services, LLC to sample one onsite wells, MW-5 for GRO, DRO, fuel related VOCs, and PAH SIM using a bladder pump and low-flow techniques. One duplicate sample is planned. The sampling is scheduled to occur in October 2017. Wendy Hansen

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

There are no documents for this site report.

Missing Location Data

Because the GIS location data for this site has not been entered, we cannot direct you to its position on the map. Click "Continue" to proceed to the Contaminated Sites Web Map or "Close" to return to the site report.
Continue     Close