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Site Report: AFSC Former Cross-town Pipeline, 1900 C Street release


Site Name: AFSC Former Cross-town Pipeline, 1900 C Street release
Address: 1900 C Street, W of C & S of Chester Cr., Anchorage, AK 99501
File Number: 2100.38.437
Hazard ID: 419
Status: Active
Staff: Wendy Hansen, 9072693059 wendy.hansen@alaska.gov
Latitude: 61.203417
Longitude: -149.887767
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

The release occurred near Chester Creek, at the intersection of 19th Avenue and C Street, West of C Street and South of Chester Creek. The release was reported by a passerby who observed free flowing product in Chester Creek on December 20, 1988. The pipeline, was pressurized and contained Jet A. The leaking section was removed on the south side of the creek, and a new section of pipeline was installed along a different route. A portion of the pipeline was abandoned in place that runs under Chester Creek. The whole 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, where cleaned out but not removed for possible future use. 130 cubic yards of contaminated soil was excavated and subsequently thermally treated. Two 42 inch product recovery wells were installed in 1989. A total of 141.6 gallons of product were recovered from the wells. Further investigation work was conducted in 2000 to help define the extent of the soil and groundwater contamination. Groundwater is 4 to 8 feet below ground surface. Sheens were observed on the groundwater in 2000. In 2000 contamination up to 2,130 mg/l DRO and 1.8 mg/l GRO in the groundwater and 378 mg/kg DRO in the soil (but no soil sample was collected at the soil/water interface of the highest groundwater contamination location). In 2005 three monitoring wells were installed and soil and groundwater samples were collected. The two product recovery wells were abandoned on June 12, 2007. Groundwater monitoring of the monitoring wells continues.

Action Information

Action Date Action Description DEC Staff
12/21/1988 Interim Removal Action Approved (Old R:Base Action Code = SC - Site Control (Emergency Response)). Booms and pads placed around seep and across stream. An estimated 30,000 gallons of Jet A was released. No Longer Assigned
1/11/1989 Update or Other Action (Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Woodward Clyde sent to Butler an initial remediation report. Product recovery system initially to be recovery wells consisting of 42" culverts installed vertically 3' above water table and extending 2' below the water table. Groundwater liner installed to help keep fuel from discharging into creek. No Longer Assigned
5/18/1989 Interim Removal Action Approved (Old R:Base Action Code = REM - Removal / Excavation). Anchorage Sand and Gravel sent letter stating that 558.46 tons of fuel stained soil from Chester Creek spill were processed into non spec. black base material. No Longer Assigned
8/15/1989 Update or Other Action (Old R:Base Action Code = SI - Site Investigation). Hart Crowser data shows that high levels of petroleum hydrocarbons remain in soil. 132 gallons of product recovered from 5/2/89 to 11/13/89. Excavation of soils not recommended since it would require closing C Street. No Longer Assigned
7/2/1990 Update or Other Action To date 75.6 gallons of Jet A recovered at creek side recovery well and 66 gallons of Jet A has been recovered in the across 19th recovery well. Robert Weimer
1/1/1992 Site Added to Database No Longer Assigned
6/15/1995 Site Ranked Using the AHRM Initial ranking. Action code added because it wasn't when the site was originally ranked. Eileen Olson
12/8/1997 Site Ranked Using the AHRM Site reranked by staff. Changed Quantity Value from 1 to 2.1; Population Density Value from 8 to 10; Population Proximity Value from .5 to 1; Environmental/Recreation Area from 2 to 0, and multiple sources from "n" to "y". 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 Staff met with Signature's environmental personnel to review the file and discuss site status. The Department notified Signature that it expects to request that Signature complete characterization of the site to determine whether soil and groundwater contamination is migrating or has diminished over time. Eileen Olson
9/6/2000 Site Characterization Workplan Approved Sent letter conditionally approving plan dated August 31, 2000 "Groundwater Sampling, East 19th and C Street" Eileen Olson
1/8/2001 Update or Other Action Received "Report for Soil and Groundwater Sampling, 19th Avenue and C Street Pipeline Release" dated December 28, 2000. The report documented up to 2,130 mg/l DRO and 1.8 mg/l GRO in groundwater and 378 mg/kg DRO in soil (but no soil sample was collected at the soil/water interface of the highest groundwater contamination location). The report recommends installing additional monitoring wells to help define the extent of the groundwater contamination. Eileen Olson
11/3/2004 Update or Other Action Formerly CS92.22 File number issued: 2100.38.437 Aggie Blandford
2/17/2005 Update or Other Action File review - RP needs to define the level and extent of the groundwater contamination and provide documentation on where the leak had occurred. Groundwater contamination has been documented on both sides of the creek, with the highest levels on the south side. Robert Weimer
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 site work. Because of limited funding this year ASIG proposes to limit the work this year to the installation of 3 or 4 monitoring wells and groundwater sampling. They will submit a revised workplan for the installation of 3 or 4 monitoring wells. We discussed that they will need additional monitoring wells and soil samples prior to closure of the site. We also discussed that additional 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 place two along the southern edge of the creek and one to the southeast near the highest groundwater contamination area in 1999. Recovery wells are to remain for the time being. Robert Weimer
6/17/2005 Update or Other Action Site ranked on ETM. Robert Weimer
7/8/2005 Update or Other Action ADEC approves workplan to install and sample 3 monitoring wells to help define the extent of the groundwater contamination. The workplan also proposes to collect 1 soil sample near boring 19-SB5. Robert Weimer
9/18/2006 Report or Workplan Review - Other November 21, 2005 Soil and Groundwater Assessment Report. Three monitoring wells were installed on 9/29/05. Up to 4 ug/l benzene, 1.62 mg/l DRO, and 0.929 mg/l GRO in the groundwater. The highest contamination levels were found near the northern free product recovery well. Groundwater was encountered at 3.70 to 7.48 feet below ground surface. Groundwater flow direction is to the northwest toward Chester Creek. One soil sample was collected from each monitoring well location. The soil samples had up to 0.004 mg/kg benzene, 0.929 mg/kg GRO, and 1.62 mg/kg DRO. Robert Weimer
5/16/2007 Update or Other Action July 31, 2006 groundwater monitoring event. Three monitoring wells were installed on 9/29/05. Up to 2 ug/l benzene, 5.02 mg/l DRO, and 0.85 mg/l GRO in the groundwater. The highest contamination levels were found near the northern free product recovery well. Groundwater was encountered at 3.88 to 7.72 feet below ground surface. Groundwater flow direction is to the northwest toward Chester Creek. Robert Weimer
5/16/2007 Update or Other Action Review and approve workplan for decommissioning the two product recovery wells. The three monitoring wells are to be sampled for BTEX, GRO,and DRO. Robert Weimer
6/23/2008 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 3 ug/l benzene, 3.55 mg/l DRO, and 0.64 mg/l GRO in the groundwater. The highest contamination levels were found near the north free product recovery well. These concentations have decrease over the previous monitoring event. Depth to groundwater was 3.88 to 7.72 feet below ground surface. The two product recovery wells were abandoned on June 12, 2007. 30 to 100 pounds of ORC advanced was placed in each recovery well before it was capped with bentonite clay. Groundwater results may be biased low due to elevated temperature in samples. Robert Weimer
7/23/2008 Update or Other Action ADEC approves workplan for annual groundwater monitoring of monitoring wells MW-1, MW-2, and MW-3 for BTEX, GRO, and DRO. Robert Weimer
4/23/2009 Report or Workplan Review - Other July 25, 2008 groundwater monitoring event. Up to 2 ug/l benzene, 2.11 mg/l DRO, and 0.77 mg/l GRO in the groundwater. The highest contamination levels were found near the north free product recovery well. These concentations have decrease over the previous monitoring event. Depth to groundwater was 3.67 to 7.55 feet below ground surface. The two product recovery wells were abandoned on June 12, 2007. 30 to 100 pounds of ORC advanced was placed in each recovery well before it was capped with bentonite clay. Robert Weimer
8/16/2010 Report or Workplan Review - Other June 23, 2009 groundwater monitoring event. Up to 0.09 ug/l benzene, 1.51 mg/l DRO, and 2.08 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. The concentation of GRO increased but the DRO amd benzene decreased from the previous monitoring event. Depth to groundwater was 3.82 to 7.85 feet below ground surface. Because DRO was found in monitoring well MW-2 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 still contaminated. Robert Weimer
10/4/2011 Site Characterization Report Approved June 15, 2010 groundwater monitoring event. Up to 1.5 ug/l benzene, 1.5 mg/l DRO, and 1.71 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. The concentation of GRO and benzene increased but the DRO decreased from the previous monitoring event. Depth to groundwater was 3.7 to 7.7 feet below ground surface. The groundwater flow direction was to the northwest toward Chester Creek. A petroleum odor was noted in monitoring well MW-2. The consultant recommends sampling all of the monitoring wells again in 2011. 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 26, 2012 groundwater monitoring event. Up to 1.4 ug/l benzene, 1.23 mg/l DRO, and 1.39 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. The concentations increased in 0 of the 3 monitoring wells sampled. Depth to groundwater was 3.66 to 7.84 feet below ground surface. The groundwater flow direction was to the northwest toward Chester Creek. Robert Weimer
9/16/2015 Report or Workplan Review - Other August 19, 2014 groundwater monitoring event. Up to 0.7 ug/l benzene, 1.0 mg/l DRO, and 0.83 mg/l GRO in the groundwater. The highest contamination levels were found near the free product recovery well. The concentations increased in 0 of the 3 monitoring wells sampled. Depth to groundwater was 3.67 to 7.84 feet below ground surface. The groundwater flow direction is generally to the northwest toward Chester Creek. All three wells were purged prior to sampling. Monitoring wells MW-1 and MW-2 were sampled using a peristaltic pump and monitoring well MW-3 was sampled using a bailer. The sampling intervals were not documented in the report or field notes. Since a peristaltic pump and a bailer were used to collect the water samples the BTEX and GRO sample results are considered biased low due to the loss of volatiles using those collection methods. Also since the sample interval was not documented at being as being as close as possible to the soil/water interface the results for BTEX, GRO, and DRO are considered biased low. Robert Weimer
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. The last round of sampling occurred in 2014. Concentrations of petroleum constituents have been below cleanup levels in three wells being sampled for the past four monitoring events, with apparent stable or decreasing trends. The last monitoring report, dated March 4, 2015, recommended site closure with Cleanup Complete status. ASIG needs to demonstrate that the nature and extent of contamination in groundwater has been fully delineated to include volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs) consistent with current ADEC 18 AAC 75.345 Table C cleanup levels. ASIG will provide an updated work plan for sampling in 2017 to include VOCs and PAHs in accordance with ADEC sampling guidance. Wendy Hansen
10/17/2017 Report or Workplan Review - Other DEC staff reviewed a work plan submitted by Ahtna Engineering Services, LLC to sample the three onsite wells, MW-1, MW-2, and MW-3 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

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