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Site Report: South Tongass Service Station

Site Name: South Tongass Service Station
Address: 2852 South Tongass Hwy; Saxman, 2.5 mile South Tongass, Ketchikan, AK 99901
File Number: 1516.26.005
Hazard ID: 24535
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 55.316790
Longitude: -131.594028
Horizontal Datum:NAD27

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

In the spring of 1995, petroleum product was observed seeping from a rock retaining wall behind the main building. The owner responded by cleaning up free product in the seep drainage path on the lower portion of the property. In June 1995, a Site Assessment was completed in conjunction with closure by removal of three 5,000-gallon underground storage tanks (USTs) and piping appurtenances from the upper portion of the property. Pinholes were observed in both of the gasoline USTs. Petroleum stained soil was observed in material above the diesel tank near the fill and vent piping, on the sides, at the ends, and underneath all the tanks. Contaminated material from the single twenty by forty by ten foot UST removal excavation was stockpiled on a liner over clean soil on the lower portion of the property. Groundwater with sheen in the excavation appeared to drain toward the retaining wall. Release Investigation in the fall of 1995 advanced thirteen soil borings and one test pit in the upper portion of the property to define the mass of the petroleum hydrocarbon (PHC) plume. Two of the borings were developed into groundwater wells and the rest were developed as vent wells. Soil samples collected from the borings indicate that elevated concentrations of diesel range organics (DRO), gasoline range organics (GRO), and benzene, toluene, ethylbenzene, and xylenes (BTEX) persist in soil between the former UST footprints and the retaining wall. Total lead detected in boring soil samples reached 15.3 milligrams per kilogram (mg/kg), total BTEX compounds reached 90.5 mg/kg, GRO reached 580 mg/kg and DRO reached 2,300 mg/kg. Groundwater analysis had results of 3.4 milligrams per liter (mg/L) benzene, 45.6 mg/L GRO and 6.2 mg/L DRO in MW-2. Corrective Action continued with removal of contaminated soil below the retaining wall in the seep drainage down gradient of the UST petroleum releases. The excavation extended to bedrock and ended eight feet from the retaining wall to preserve its integrity. The contaminated soil material was added to the UST removal contaminated soil stockpile on the lower portion of the property. Confirmation soil samples at the limits of excavation were below Method Two petroleum and lead in soil cleanup levels.

Action Information

Action Date Action Description DEC Staff
7/21/1995 Leaking Underground Storage Tank Release Confirmed - Petroleum In the spring of 1995 petroleum product was observed seeping from a rock retaining wall behind the main building. The owner responded by cleaning up free product in the seep drainage path on the lower portion of the property. In June, 1995 a Site Assessment was completed in conjunction with closure by removal of three 5,000 gallon underground storage tanks (USTs) and piping appurtenances from the upper portion of the property. Pinholes were observed in both of the gasoline USTs. Petroleum stained soil was observed in material above the diesel tank near the fill and vent piping, on the sides, at the ends, and underneath the all the tanks. Contaminated material from the single twenty by forty by ten foot UST removal excavation was stockpiled on a liner over clean soil on the lower portion of the property. Ground water with sheen in the excavation appeared to drain toward the retaining wall. Bruce Wanstall
7/21/1995 Site Added to Database Former Staff
8/29/1995 Underground Storage Tank Site Characterization or Assessment DEC letter to RP in agreement that additional site characterization of the petroleum plume is needed with analysis for lead in soil. Request made that corrective action plan include remediation of groundwater and a drinking water well search in the vicinity. Bruce Wanstall
10/2/1995 Leaking Underground Storage Tank Corrective Action Underway Six soil vent wells, 2 groundwater monitoring wells and 2 soil gas monitoring points were installed to evaluate groundwater contamination and provide options for remedial treatment. Soil samples collected from the borings to install these wells in the commercial area of the property just east of the building indicate that elevated concentrations of DRO, GRO and BTEX persist in soil between the former UST footprints and the retaining wall. Bruce Wanstall
11/2/1995 Leaking Underground Storage Tank Cleanup Initiated - Petroleum In the fall of 1995 Release Investigation led to corrective action removal of contaminated soil below the retaining wall in the seep drainage down gradient of the UST petroleum releases. The excavation ended 8 feet from the retaining wall to preserve its integrity. The contaminated soil material was added to the UST removal stockpiled on the lower portion of the property. Bruce Wanstall
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: SOUTH TONGASS SERVICE Former Staff
11/18/1998 Long Term Monitoring Established In the June1998 Release Investigation water samples were collected from three of the eight wells installed on the upper portion of the property. Concentrations of BTEX compounds were not detected in the sample from well No. 7 and each compound detected in samples from well No. 3 and No. 8 were below Table C cleanup levels. DRO and GRO were not detected in the sample from well No. 7 but were detected in samples from well No. 3 and No. 8; GRO reached 5.7 mg/L in the sample from well No. 8 and 1.5 mg/L in well No. 3. The field duplicate sample analytical results were within acceptable range for quality assurance. Bruce Wanstall
10/2/2001 Update or Other Action Changed Project Manager from Paul Horwath to Mike Jaynes Cynthia Pring-Ham
3/20/2002 Update or Other Action Reranked site based on detected gw contamination and local knowledge Mike Jaynes
3/20/2002 Update or Other Action File contains report from 1998 showing levels of 5,900 ppm GRO in perched groundwater. Will contact owner to find out current status. Mike Jaynes
1/8/2004 Document, Report, or Work plan Review - other File review to evaluate status; oversight transfer to Bruce Wanstall; address and Lat/ Long data and other database fields updated to reflect file data. Bruce Wanstall
5/26/2004 Update or Other Action File review and call to RP/owner to inform about ADOT inquiries into property contamination status; requested site data more recent than the 10/98 monitoring report if available. Current data is needed to determine site status in light of new construction plans in adjacent right of ways. Bruce Wanstall
7/18/2005 Site Visit Meeting on-site with Mr. Berto; observed monitoring well arrangement, current AST setup and storm drain system with oil/ water separator. Discussed need for current site data on groundwater contamination and a long term monitoring plan. Bruce Wanstall
3/22/2006 Update or Other Action Phone call to Mr. Berto to get an update on the development of a long term ground water monitoring plan. Review site layout and road right-of-way properties. Contact not made; call was not returned. Bruce Wanstall
5/22/2006 Update or Other Action Examine status of the DEC request to the current owner Southeast Stevedoring that they inspect the condition of and collect samples from the groundwater wells and report the site data. Bruce Wanstall
6/1/2006 Update or Other Action Letter to the RP requesting site data and notify the RP of cost recovery by the DEC. Bruce Wanstall
10/9/2006 Update or Other Action Review the file for site status & contact information; review development at the adjacent Saxman Terminal; call Mr. Berto for update and provide assistance. Message taken for Mr. Berto to contact the DEC concerning the USTs at the station. Bruce Wanstall
12/5/2006 Update or Other Action Discussion with consultant R&M about drafting a monitoring well sampling plan. Review UST Closure and Corrective Action Reports and correspondence for site cleanup assessment recommendations. Bruce Wanstall
12/6/2006 Update or Other Action Prepare digital copies of tank closure by removal reports and forward to R&M to assist in preparing work plan and conceptual site model for DEC approval. Bruce Wanstall
1/17/2007 Exposure Tracking Model Ranking ETM: Baseline Ranking; soil, air, ground water, and ecological pathways are complete; groundwater ingestion is the controlling pathways for potential exposure. Jill Taylor
2/16/2007 Site Visit Met on-site with the facility manager & consultant. Arranged for removal of well caps; inspected condition of groundwater monitoring and vapor injection/extraction wells. 36 inches of water detected MW-2 but bend at surface mount delayed sampling until a pump is obtained. MW-1 and other wells will be evaluated for depth and productivity by R&M. Bruce Wanstall
8/2/2007 Update or Other Action Reviewed recent correspondence and then contacted the RP and consultant to determine the status of monitoring well sampling plans for the site; provided assistance on obtaining geotechnical equipment. Bruce Wanstall
3/3/2008 Update or Other Action Complete exposure pathways include direct contact with surface and subsurface contaminated soil, outdoor and indoor inhalation of petroleum vapors, ingestion of contaminated groundwater and impact to aquatic and terrestrial ecological receptors. Bruce Wanstall
3/4/2008 Potentially Responsible Party/State Interest Letter ADEC letter requesting current site assessment and notification of cost recovery was sent to the responsible party certified mail today. The letter requests the RP contact ADEC within 30 days with intentions to provide current site data. Bruce Wanstall
4/2/2008 Update or Other Action ADEC received $2,461.90 from the responsible party in return for site cleanup oversight.1 Bruce Wanstall
4/23/2008 Update or Other Action Signed return receipt on State Interest letter was received and 30-day limit to respond with intentions to develop a workplan is passed. Bruce Wanstall
6/3/2008 Update or Other Action ADEC contacted the office of the responsible party with notification that the environmental consultant is prepared to proceed with the ground water sampling planned. The RP needs to authorize moving forward. Bruce Wanstall
7/29/2008 Update or Other Action ADEC provided the most recent site assessment report to the facility manager to assist an environmental contractor to prepare a conceptual site model and sampling plan. Bruce Wanstall
4/28/2009 Update or Other Action ADEC requested development of a conceptual site model and sampling workplan for 2009. Bruce Wanstall
10/20/2009 Long Term Monitoring Complete In the July 2009 Release Investigation water samples were collected from two wells installed on the upper portion of the property. Concentrations of BTEX, GRO and DRO were not detected in the samples from well No. 3 and well No. 8. The field duplicate sample analytical results were within acceptable range for quality assurance. Bruce Wanstall
11/5/2009 Document, Report, or Work plan Review - other Review the Test America Analytical Report (580-14284-1) for the South Tongass Service Station Underground Storage Tank Facility ID#0-001492 Release Source Area ID# 77605; the data meet ADEC quality assurance criteria and the Report is approved Bruce Wanstall
6/25/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77605 USTs. Bruce Wanstall
6/29/2010 Cleanup Complete Determination Issued The cleanup actions to date have served to excavate and adequately remediate contaminated soil and ground water at the site. Following investigation, cleanup and long term monitoring at the site, exposure to the remaining contaminants was evaluated using ADEC’s Exposure Tracking Model (ETM). ETM results show all pathways to be De Minimis Exposure or Incomplete. Based on the information available, ADEC has determined no further assessment or cleanup action is required. Bruce Wanstall
6/29/2010 Institutional Control Record Removed Institutional Controls have been removed. Bruce Wanstall

Contaminant Information

Name Level Description Media Comments
GRO < Table C Groundwater In the July 2009 Release Investigation water samples were collected from two wells installed on the upper portion of the property. Concentrations of BTEX, GRO and DRO were not detected in the samples from well No. 3 and well No. 8. The field duplicate sample analytical results were within acceptable range for quality assurance.
DRO < Table C Groundwater In the July 2009 Release Investigation water samples were collected from two wells installed on the upper portion of the property. Concentrations of BTEX, GRO and DRO were not detected in the samples from well No. 3 and well No. 8. The field duplicate sample analytical results were within acceptable range for quality assurance.
Benzene < Table C Groundwater In the July 2009 Release Investigation water samples were collected from two wells installed on the upper portion of the property. Concentrations of BTEX, GRO and DRO were not detected in the samples from well No. 3 and well No. 8. The field duplicate sample analytical results were within acceptable range for quality assurance.
Ethylbenzene < Table C Groundwater In the July 2009 Release Investigation water samples were collected from two wells installed on the upper portion of the property. Concentrations of BTEX, GRO and DRO were not detected in the samples from well No. 3 and well No. 8. The field duplicate sample analytical results were within acceptable range for quality assurance.
Toluene < Table C GroundwaterGroundwater In the July 2009 Release Investigation water samples were collected from two wells installed on the upper portion of the property. Concentrations of BTEX, GRO and DRO were not detected in the samples from well No. 3 and well No. 8. The field duplicate sample analytical results were within acceptable range for quality assurance.
Xylenes (total) < Table C Groundwater In the July 2009 Release Investigation water samples were collected from two wells installed on the upper portion of the property. Concentrations of BTEX, GRO and DRO were not detected in the samples from well No. 3 and well No. 8. The field duplicate sample analytical results were within acceptable range for quality assurance.
DRO < Method 2 Most Stringent Soil Laboratory analysis of soil samples from the contaminated soil stockpile located on the lower portion of the property indicates no soil contamination above GRO and DRO migration to groundwater soil cleanup levels.
GRO < Method 2 Most Stringent Soil Laboratory analysis of soil samples from the contaminated soil stockpile located on the lower portion of the property indicates no soil contamination above GRO and DRO migration to groundwater soil cleanup levels.
Benzene < Method 2 Most Stringent Soil
Ethylbenzene < Method 2 Most Stringent Soil
Toluene < Method 2 Most Stringent Soil
Xylenes (total) < 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.

No associated sites were found.

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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