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Site Report: ARRC Portage


Site Name: ARRC Portage
Address: Portage, Girdwood, AK 99587
File Number: 2113.26.001
Hazard ID: 23041
Status: Cleanup Complete
Staff: ,
Latitude: 60.819401
Longitude: -148.974368
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

500 gallon leaded gasoline tank removed 1990. Confirmation samples indicate up to 1390 mg/Kg TVPH and 278.65 mg/Kg BTEX. 2" PVC pipe was installed in the tank excavation in case an SVE system would be necessary post excavation. 30 cubic yards of contaminated soil was removed from the excavation. Condition of groundwater is unknown. FKA LCS 57.07

Action Information

Action Date Action Description DEC Staff
10/23/1990 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77583 (Added by System) David Allen
10/23/1990 Leaking Underground Storage Tank Cleanup Initiated - Petroleum * Not Assigned
10/23/1990 Site Added to Database * Not Assigned
12/2/1992 Update or Other Action Final Report 1990 Underground Storage Tank Removal and Site Characterization Portage Section dated February 1991, submitted by ENSR and received by the ADEC on this date. A 500 gal. gas UST was removed October 23-24 1990. Approximately 30 cubic yards of contaminated soil was excavated from around the former UST, but was limited due to: proximity of RR tracks, a 500 gal AST to the north, and wetlands to the east. The contaminated soil was temporarily places on visqueen, than transferred to the Old Engineering Spur ARRC Anchorage Yard. 5 confirmation samples, collected from the depths and sidewalls of excavation, with the exception of the eastern sidewall, contained up to 1,390 mg/kg TVPH, 0.152 mg/kg benzene, 15.7 ethylbenzene mg/kg, 8.19 toluene mg/kg, and 247.6 mg/kg total xylenes. The excavation was than backfilled with fertilizer and microbes to promote natural attenuation. Groundwater contamination unknown. Grant Lidren
8/21/2002 Update or Other Action RECKEY has automatically been generated. Cynthia Pring-Ham
5/3/2005 Report or Workplan Review - Other 500 gallon leaded gasoline tank removed 1990. Confirmation samples indicate up to 1390 mg/Kg TVPH and 278.65 mg/Kg BTEX. 2" PVC pipe was installed in the tank excavation in case an SVE system would be necessary post excavation. 30 cubic yards of contaminated soil was removed from the excavation. Condition of groundwater is unknown. Eric Henry
6/3/2005 Update or Other Action File number issued 2113.26.001. FKA LCS 57.07 Aggie Blandford
12/19/2006 Exposure Tracking Model Ranking ETM Baseline Ranking completed 12/12/06. Extent of contamination unknown as soil samples were not collected from all walls of excavation. No GW data obtained. Possible wild foods collection area? Other pathways either incomplete or low or de minimus exposure potential. Daniel Fremgen
4/4/2008 Update or Other Action Coordinates updated with Topozone WGS84 datum Grant Lidren
6/2/2009 Report or Workplan Review - Other On this date, the ADEC reviewed the Work Plan for Soil Borings and Sampling Portage Section House Anchorage, Alaska, dated May 2009 and submitted by Clarus. Three soil borings will be advanced 15 ft. bgs; one will be advanced at the edge of the embankment toward the marsh to the east, one south of the former UST excavation, and one north of the former UST excavation and work shed. GW is assumed to be 10 ft. bgs. The soil borings will not extend further than 5 ft. into the GW. Two soil samples, collected at 5 ft. intervals will be submitted to the lab for analysis from each boring. One soil sample will be selected from the GW interface and one will be selected from the interval w/ the highest pid reading. Three temporary GW wells will also be installed and sampled adjacent to the soil borings. Grant Lidren
2/26/2010 Report or Workplan Review - Other ADEC received Phase II Soil and Groundwater Investigation Report Former Portage Section House, submitted by Clarus, dated February 1, 2010. Three soil borings were advanced: one to edge of the marsh to the east, one just south of the former UST, and one north of the former work shed (the shed has been removed, but a concrete pad is still present). The seven soil samples were analyzed for BTEX and GRO, but benzene was the only analyte detected above cleanup levels in two soil samples. One soil samples collected 10 to 12 ft. bgs just south of the former UST contained 0.0349 mg/kg benzene. Another soil samples collected 5to 7 ft. bgs just north of the former workshed contained 0.0349 mg/kg benzene. Four water samples, collected from three temporary wells, located adjacent to the soil borings, analyzed for BTEX and GRO, did not contain detectable levels of contaminants. Groundwater was encountered at 12.5 feet. bgs. Grant Lidren
3/15/2010 Cleanup Complete Determination Issued The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, has completed a review of the environmental records associated with Alaska Railroad Corporation (ARRC) Portage. Based on the information provided to date, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment, and this site is considered closed. This decision is based on the administrative record for the ARRC Portage, which is located in the offices of the Alaska Department of Environmental Conservation in Anchorage, Alaska. Grant Lidren
8/7/2015 Update or Other Action This file has been archived at Alaska Archived Barcode: 896984 Box 418 Susan Carberry

Contaminant Information

Name Level Description Media Comments
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
No ICs Required

Requirements

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

Missing Location Data

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