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Site Report: ARRC - Hurricane former UST site


Site Name: ARRC - Hurricane former UST site
Address: ARR milepost 284.2; , Talkeetna, AK 99676
File Number: 2258.26.008
Hazard ID: 23545
Status: Active
Staff: Grant Lidren, 9072698685 grant.lidren@alaska.gov
Latitude: 62.977225
Longitude: -149.643059
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

On September 5th 1990, two USTs were excavated. The tanks consisted of a 500 gallon gasoline tank and a 7,500 gallon diesel tank. Soil was found to be contaminated.

Action Information

Action Date Action Description DEC Staff
12/12/1990 Underground Storage Tank Site Characterization or Assessment Underground Storage Tank Removal Alaska Railroad Hurricane Section, MP 281 submitted by ENSR to ADEC on this date. A 500 gal. gasoline UST & a 7,500 gal. diesel UST were removed. At the diesel tank excavation, no GW was encountered at a depth of 8 ft. bgs. Contaminated soil was stockpiled on site. Seven soil samples were collected: three from the bottom; and one from each sidewall. Confirmation samples contained TPH up to 17,700 mg/kg. At the gas tank excavation, the top of the tank was buried @ ground level, therefore the excavation was shallow @ 4 ft. bgs and no GW was encountered. The only soil sample collected under the fill pipe contained TVPH up to 488 mg/kg. The excavation was then backfilled except for surface contaminated soils. The contaminated soil stockpile was moved to ARRC Gold Creek @ MP 263 where it awaited to be transferred for thermal remediation. Grant Lidren
5/21/1991 Underground Storage Tank Site Characterization or Assessment SA1R; Reviewed a phase 1 site assessment. * Not Assigned
4/10/1995 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77585 ADD; Site added to database. * Not Assigned
4/10/1995 Site Added to Database * Not Assigned
4/11/1995 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; LUST corrective action underway. : LCAU date changed DB conversion * Not Assigned
12/13/2006 Exposure Tracking Model Ranking ETM: Baseline Ranking Jill Taylor
3/19/2007 Update or Other Action File number issued 2258.26.008 (FKA L57.??). Aggie Blandford
4/30/2009 Update or Other Action ADEC communication with ARRC indicates the stockpile no longer remains on site Grant Lidren
7/27/2009 Report or Workplan Review - Other On this date, ADEC received the Work Plan for Soil Borings and Sampling Hurricane Siding dated May 2009, submitted by Clarus. Three soil borings will be collected from the former diesel UST location. The three soil borings will be installed south, southwest, and west and will be located as close as feasible to the former UST sidewall location. In particular near S1. If gross contamination is encountered in the borings, Clarus will step out to evaluate extent of contamination. Soil will be screened at 5 ft. intervals down to 20 ft. bgs. Two soil samples will be collected from each soil boring and analyzed for DRO, GRO, RRO and BTEX. Grant Lidren
4/6/2010 Report or Workplan Review - Other On this date, ADEC received Phase II Investigative Report Hurricane Siding, submitted by Clarus and dated April 2, 2010. Ten soil samples and one duplicate sample were collected from five soil borings advanced on the south, southwest, and west sides of the former diesel UST excavation. A hydrocarbon odor was noted at three of the five bore holes. At each borehole: one soil sample was collected from the GW interface at 5 to 6 ft. bgs and one soil sample was collected from the vadose zone at 2 to 3 ft. bgs. The soil samples contained GRO up to 936 mg/kg and DRO up to 84,400 mg/kg. A drinking water well, installed in 2000, is located 75 feet away from the known extent of soil contamination. The well log indicates the artesian wells static water level was over the top of the casing. The well is 60 feet bgs, below two clay layers. Grant Lidren
8/17/2011 Report or Workplan Review - Other On this date, ADEC received the Work Plan for Soil Boring Groundwater Sampling Hurricane Siding submitted by RSE. Three soil borings will be advanced down gradient and completed as monitoring wells. Two soil samples will be collected per boring plus one duplicate. One sample will be collected from the GW interface and one will be collected from the highest PID reading. One groundwater sample will be collected from each MW plus one duplicate. Grant Lidren
1/11/2012 Update or Other Action On this date, ADEC received the Site Characterization Report for ARRC Hurricane Siding submitted by RSE dated January 2012. Four soil borings were advanced and completed as monitoring wells. Five soil samples collected from each boring at a depth of 3 to 4 feet bgs contained contaminant concentrations below cleanup levels. Five groundwater samples collected from the four monitoring wells contained contaminant concentrations below cleanup levels with the exception of the down gradient MW RSE-4, which contained DRO at 1.52 mg/L. At RSE-4, In addition to the GW containing a HC odor, the soil contained a slight HC odor as well at 5 to 10 ft. bgs. Groundwater was encountered 5 to 10 feet bgs at the site and the groundwater was generally flowing to the north west. Grant Lidren
8/31/2012 Site Characterization Workplan Approved On this date, ADEC approved the Hurricane Work Plan. All four MWs will be sampled Grant Lidren
11/7/2012 Site Characterization Report Approved On this date, ADEC received the Final Groundwater Monitoring Report Hurricane Siding submitted by FES, dated October 24, 2012. Depth to GW was 2.9 to 3.5 feet bgs and GW was flowing north-northwest. RSE-1 and RSE-2 did not contain detectable concentrations of contaminants. RSE-3 and RSE-4 contained detectable concentration of contaminants, but below cleanup levels. RSE-3 contained DRO at 0.779 mg/L. RSE-4 contained GRO at 0.456 mg/L, DRO at 0.601 mg/L, ethylbenzene at 0.000970 mg/L, and xylenes at 0.00676 mg/L. RSE-4 contained a hydrocarbon odor. Grant Lidren
5/10/2013 Risk Assessment Workplan Approved On this date, ADEC received the 2013 Groundwater Monitoring Work Plan Hurricane Siding submitted by FES dated May 9, 2013. The four onsite monitoring wells will be analyzed for GRO, DRO, RRO, and BTEX. Natural Attenuation parameters will also be analyzed. Grant Lidren
7/8/2013 Potentially Responsible Party/State Interest Letter PRP letter sent to ARRC on this date. Grant Lidren
10/3/2013 Report or Workplan Review - Other On this date, ADEC received the September 30, 2013 Groundwater Monitoring Report Hurricane Siding submitted by FES. The four onsite monitoring wells were analyzed for: GRO, DRO, RRO, BTEX; and the natural attenuation parameters ferrous iron and sulfate. Groundwater was encountered at 2.1 to 4.5 feet bgs flowing to the north-northwest. Only one of the MWs, RS-3 contained detectable concentrations of contaminants above cleanup levels with DRO at 5.51 mg/L and RRO at 1.34 mg/L. Additionally, RS-3 and RS-4 contained a hydrocarbon odor. Elevated ferrous iron concentrations were detected in RSE-3 and RSE-4 relative to RSE-1 and RSE-2. Elevated sulfate was detected in RSE-1 and RSE-2 relative to RSE-3 and RSE-4. Grant Lidren
9/15/2014 Update or Other Action ARRC plans to monitor the onsite MWs September 2014, but postpone excavation activities until June 2015. Grant Lidren
9/18/2014 Site Characterization Workplan Approved On this date, ADEC received the 2014 Groundwater Monitoring Work Plan Hurricane Siding submitted by FES dated May 9, 2013. The four onsite monitoring wells will be analyzed for GRO, DRO, RRO, and BTEX. Grant Lidren
1/20/2015 Site Characterization Report Approved On this date, ADEC received the November 26, 2014 Groundwater Monitoring Report Hurricane Siding submitted by FES. The four onsite monitoring wells were analyzed for: GRO, DRO, RRO, BTEX; and the natural attenuation parameters ferrous iron and sulfate. Groundwater was encountered at 2.1 to 4.5 feet bgs flowing to the north-northwest. Only one of the MWs, RS-3 contained detectable concentrations of DRO above cleanup levels with DRO at 1.88 mg/L. Additionally, purge water from RS-3 and RS-4 contained a light to moderate hydrocarbon odor. Elevated ferrous iron concentrations and reduced sulfate concentrations were detected in RSE-3 and RSE-4 relative to RSE-2. Grant Lidren
7/8/2015 Site Characterization Workplan Approved On this date, ADEC approved the 2015 Soil Removal Work Plan, Rev 1 Hurricane Siding dated July 8, 2015 submitted by FES. Grant Lidren
1/26/2016 Offsite Soil or Groundwater Disposal Approved On this date, ADEC acknowledged that 131.61 tons of petroleum impacted soil was received by ASR. Grant Lidren
2/8/2016 Site Characterization Report Approved On this date, ADEC received the 2015 Soil Removal Report, Rev 1 ARRC Hurricane Siding dated January 13, 2016 submitted by FES. The excavation was bisected by eight buried electrical lines manifesting the need for a north and a south excavation. At the north excavation, the excavation was limited by buried electrical lines to the east and south and to the west by an existing concrete foundation. Groundwater was encountered at 4.5 feet bgs and the depth of the excavation was 4 feet bgs. Two floor and four sidewall soil samples collected contained DRO up to 44,000 mg/kg, GRO up to 467 mg/kg, and benzene up to 0.132 mg/kg. At the south excavation, the excavation was limited by buried electrical lines to the north. Groundwater was encountered at 5.0 feet bgs and the depth of the excavation was 4.5 feet bgs to 3 feet bgs at the west part of the excavation based on field screen results. Three floor and five sidewall soil samples collected contained DRO up to 17,400 mg/kg and GRO up to 470 mg/kg. . Approximately 100 cy of contaminated soil were removed from the excavations and was capped with clean fill. Contaminated soil was transported to ASR for thermal remediation. Grant Lidren
5/25/2016 Site Characterization Workplan Approved The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the 2016 Groundwater Sampling Work Plan, Rev 1 Hurricane Siding submitted by FES and dated May 20, 2016. ADEC has no objections to the Work Plan and FES may proceed pending the following comment: if free product or sheen are present in development or purge water, it will be containerized and transported to the oil water separator in the Anchorage Shop. ARRC must submit a Transport, Treatment, & Disposal Approval Form for Contaminated Media to ADEC prior to transport. Grant Lidren
10/4/2016 Site Characterization Report Approved On this date, ADEC received the August 22, 2016 Groundwater Monitoring Report Hurricane Siding submitted by FES. The four onsite monitoring wells were analyzed for: GRO, DRO, RRO, BTEX; and the natural attenuation parameters ferrous iron and sulfate. Groundwater was encountered at 1.6 to 4.4 feet bgs flowing to the north-northwest. None of the groundwater samples from the monitoring wells contained contaminant concentrations above Table C groundwater cleanup levels. However, purge water from RS-3 contained a hydrocarbon odor. Elevated ferrous iron concentrations and reduced sulfate concentrations were detected in RSE-3 and RSE-4 relative to up gradient wells. Grant Lidren
8/22/2017 Site Characterization Workplan Approved On this date, ADEC received and reviewed the Work Plan for Groundwater Sampling at ARRC MP 284.2 Talkeetna, Alaska ADEC File # 2258.26.008 Rev 1.0 submitted by RSE dated August 22, 2017. ADEC has no objections to this work plan and RSE may proceed. Grant Lidren
12/11/2017 Report or Workplan Review - Other On this date, ADEC received the Letter Report for Groundwater Sampling at ARRC MP Hurricane Section submitted by RSE and dated November 28, 2017. Monitoring wells RSE-1, RSE-2, and RSE-3 were analyzed for: GRO, DRO, RRO, BTEX; RSE-4 was also analyzed for the full suite of VOCs and PAHS. Only monitoring wells RSE-3 and RSE-4 contained contaminant concentrations above table C groundwater cleanup levels with DRO up to 1.82 mg/L and naphthalene up to 3.08 ug/L. A sheen was observed during the purging of RS-4. Groundwater was encountered at 1.0 to 4.0 feet bgs. Grant Lidren

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details

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