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Site Report: ARRC - Anchorage Terminal Reserve GW Areas 2/3 & 4

Site Name: ARRC - Anchorage Terminal Reserve GW Areas 2/3 & 4
Address: 185 & 619 East Ship Creek Avenue, Ship Creek Ave - Ingra West to North C St, Anchorage, AK 99501
File Number: 2100.38.447
Hazard ID: 4626
Status: Active
Staff: Grant Lidren, 9072698685
Latitude: 61.222500
Longitude: -149.877900
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.


Remedial Investigation ARRC Anchorage Terminal Reserve U.S. EPA Docket No. CERCLA 10-2004-0065, submitted by ENSR and received by the ADEC on this date. This site is located at the Groundwater areas of interest 2/3 and 4 in the Anchorage Terminal Reserve. The area is characterized by two vinyl chloride plumes. The groundwater 2/3 plume begins at lease property 077 (corner of Ingra Street and Ship Avenue) and extends east to lease property 128 (near corner of Ship Creek Avenue and N. Cordova). The groundwater 4 plume begins at lease property 064 (corner N. Cordova and East Avenue) and extends Northwest to Lease Property 057 ( W Ship Creek Avenue and N. C Street). The distribution of the vinyl chloride plumes are distinct from each other, based on the distribution of the vinyl chloride as well as the groundwater direction. The contaminant concentrations of the two plumes are similar. The vinyl chloride plume at groundwater 2/3 indicate contamination up to 0.025 mg/L. The vinyl chloride plume at groundwater 4 indicate contamination up to 0.0095 mg/L. Both plumes appear to be flowing to the northwest, which is consistent with the current groundwater direction. Both plume areas seem to be the result of an offsite source. For more information consult CS file # 2100.38.447 ARRC Anchorage Terminal Reserve

Action Information

Action Date Action Description DEC Staff
4/8/2008 Site Added to Database Site added to the database. Mitzi Read
4/9/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Grant Lidren
4/9/2010 Update or Other Action ADEC has no objection to the proposed transportation of approximately 250 cubic yards of DRO and RRO contaminated soil (up to 702 mg/kg and 2,350 mg/kg respectively) from ARRC - Anchorage Terminal Reserve GW Areas 2/3 & 4, ARRC Building 16(freight shed) at the corner of East 1st Ave. and North C Street. The soil is approved for transport to the ARRC Gravel Track Birchwood Yard MP 135.5, conditional on the following: the soil shall be containerized and/or covered during transport; the soil shall not be mixed; the soil shall not contain debris; and the soil shall be land spread into a thin surface layer 18 inches thick. Pending completion of the land spreading activities, soil samples will need to be collected. The soil samples will need to be field screened and analyzed for diesel range organics (DRO). Grant Lidren
11/24/2010 Update or Other Action On this date ADEC received ARRC – Anchorage Terminal Reserve GW Areas 2/3 & 4 Freight Shed Stockpile Sampling. Two-five spot composite samples contained DRO up to 85.5 mg/kg. Grant Lidren
11/29/2010 Update or Other Action The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, has no objection to the land spreading of the Freight Shed stockpile located within the ARRC Birchwood Rail Yard. The landspread stockpile must be must be located at least 100 feet from surface water. Grant Lidren
4/20/2016 Update or Other Action On this date, ADEC received the Anchorage Terminal Reserve Oversight Referral letter submitted by EPA dated April 18, 2016. The letter states, "EPA will enter a corrective action event code into RCRAInfo to indicate the site has been transferred to a non-RCRA authority, with event code comments documenting the transfer of responsibility to ADEC." As a result, ADEC will continue to manage contaminated sites in the Anchorage Terminal Reserve in accordance with State regulations. Grant Lidren
5/4/2017 Site Characterization Report Approved Ahtna submitted the Final Work Plan Groundwater and Indoor air Evaluation Alaska Real Estate Parking Lot ADEC SPAR Term Contract #18-8036-13 dated March 6, 2017. Work to be completed includes, among other things, monitoring area-wide groundwater from the Alaska Real Estate site (2100.38.434) and monitoring this GW 2/3 & 4 site. Grant Lidren
11/6/2017 Site Characterization Report Approved ADEC received the Groundwater Evaluation Interim Report Alaska Real Estate Parking Lot, Anchorage, Alaska Notice-to-Proceed Number 17000735 dated October 23, 2017 submitted by Ahtna. Twenty-five MWs were scheduled for sampling but only 13 MWs were sampled. The other monitoring wells were not located and may no longer be present. Two of the monitoring wells sampled within the GW 2/3 area (MWB08 and AKRRMW-24S) contained detectable levels of contaminants, but below cleanup levels. see file 2100.38.434 Alaska Real Estate Parking lot for further information. Grant Lidren
3/9/2018 Site Characterization Report Approved ADEC received the Letter Report for Groundwater Sampling within the ARRC Anchorage Terminal Reserve Whitney Road, Anchorage, Alaska ADEC File # 2100.38.447, Hazard ID 4074 Rev. 1.3 submitted by RSE and dated March 9, 2018. Eleven monitoring wells were proposed to be sampled within the Anchorage Terminal Reserve: MWB17, DPB21, MW24, MWB09, MWA05, MWA07, DPB04, DPA32, MWA22, MWE05, and MWE06. Two of these wells, DPB21 (GW-1) and MWE05 (GW-7), were not sampled due to poor well condition and free product respectively. These 11 MWs are half the wells on the property, the remaining wells will be sampled in 2018. Monitoring wells MW24 (GW 2/3) and MWE06 (GW-7) produced purge water emitting strong hydrocarbon odor. Monitoring well MWA07 (GW-6) produced purge water with visible sheen. Monitoring wells MWA07 (GW-6) and MWE06 (GW-7) contained DRO of 2.42 mg/L and 27.6 mg/L respectively exceeding the ADEC Table C Groundwater Cleanup Level (GCL) of 1.5 mg/L. Sampling of monitoring wells MWA05 (GW-6) and MWE06 (GW-7) contained RRO of 2.42 mg/L and 3.17 mg/L respectively exceeding the GCL of 1.1 mg/L RRO. Monitoring well MWE06 (GW-7) contained 1,2,4-trimethylbenzene at 117 ug/L exceeding the GCL of 15 ug/L and naphthalene at 270 ug/L exceeding the GCL of 1.7 ug/L. Sample MWB17 (GW-1) contained chloroform at 2.90 ug/L above the GCL of 2.2 ug/L chloroform and trichloroethylene(TCE) at 14.7 ug/L exceeding the GCL of 2.8 ug/L. Monitoring well DBP04 (GW-4) contained vinyl chloride at 1.27 ug/L exceeding the GCL of 0.19 ug/L.MWA05 (GW-6) contained cadmium (25.3 ug/L) and vanadium (180 ug/L) each exceeding the respective GCL of 9.2 ug/L cadmium and 86 ug/L vanadium. This well had evidence of compromise, with an exposed wellhead that may have contributed to groundwater being exposed to external conditions and should be decommissioned. Grant Lidren

Contaminant Information

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