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Site Report: Delta Western Bulk Plant - Dutch H.

Site Name: Delta Western Bulk Plant - Dutch H.
Address: Amaknak Island, Dutch Harbor, Unalaska, AK 99685
File Number: 2542.38.002
Hazard ID: 487
Status: Active
Staff: Kathleen Iler-Galau, 9074512153 kathleen.iler-galau@alaska.gov
Latitude: 53.888336
Longitude: -166.533756
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

Diesel fuel seeping from the area below concrete tanks used for bulk storage. Diesel fuel leaks were reported to this office by a citizen in Dutch Harbor. In 2004, petroleum hydrocarbon impacted soils and LNAPL were detected neat tank 12 access tunnel entrance and the source was a 'pinhole leak' in a underground pipeline. LNAPL was present in downgradient MW MWRP-28 in 2005. Prior staff assigned were Wright, Dronenburg, and Burger. This site consists of six above ground fuel tanks located on the top of Rocky Point on Amaknak Island and is referred to as the upper tank farm, constructed by Chevron in the 1960's and remains active. The area is fenced and the tanks have been used to store leaded and unleaded gasoline, jet fuel, aviation gasoline, and diesel. Product from the upper tank farm is gravity fed to the Delta Western Truck Loading Rack and the Delta Western Dock. It is immediately adjacent to another site, identified as "Dutch Harbor - Rocky Pt Tank Hill" that consists of four concrete underground fuel storage tanks that are no longer in use. Another Delta Western tank farm "Dutch Harbor - Rocky Pt - Lower TF" is located at the base of Rocky Point, adjacent to the American Presidents Line (APL) bulkhead and facility. The groundwater contamination that underlays the site is being tracked under the Rocky Point Tank Hill site.

Action Information

Action Date Action Description DEC Staff
3/12/1988 Site Added to Database Diesel fuel. Former Staff
3/27/1988 Update or Other Action (Old R:Base Action Code = MS - Monitoring/Sampling). Sampling results show petroleum contamination in all samples taken from tank farm. 4 samples indicate severe biodegradation from old spills. A more complete investigation to match fuel sources with samples taken is needed. Former Staff
6/15/1988 Update or Other Action (Old R:Base Action Code = FI - Field Inspection (General)). An ADEC investigation concluded that there was diesel in the soil below the tanks, that the spill appears to be fairly recent and it involved the Delta Western bulk facility. Former Staff
7/21/1988 Update or Other Action (Old R:Base Action Code = MS - Monitoring/Sampling). Investigation was conducted to determine whether there is leakage and it was concluded that existing underground storage tanks aren't leaking. Soiled areas maybe showing residual effects from products spilled by prior operators. Former Staff
11/10/1988 Update or Other Action (Old R:Base Action Code = MS - Monitoring/Sampling). 19 soil samples taken by areas identified by ADEC that required further investigation showed weathered hydrocarbons present. Based on additional investigation they state that there is not a current problem with leaking storage tanks. Former Staff
12/4/1988 Update or Other Action (Old R:Base Action Code = FI - Field Inspection (General)). The first round of sampling has been completed and reported to ADEC. ADEC has reviewed the report and will submit comments on December 4, 1988. Former Staff
9/1/1990 Site Number Identifier Changed 88210107101 now 88260107101 region 21 not 26. Former Staff
1/7/1991 Site Ranked Using the AHRM Initial ranking. Former Staff
9/29/1992 Site Number Identifier Changed Region portion of Reckey number changed to consolidate district 26 into 25. Former Staff
12/3/1996 Preliminary Assessment Approved (Old R:Base Action Code = RI - Remedial Investigation). Site Assessment of the working tank farm footprint reviewed. 13 soil samples were collected from ten test pits, bedrock was present in five pits from 1 to 6.5' bgs. A thin black viscous layer was present in two pits and groundwater was observed at 10' bgs in TP4. DRO was measured up to 9,150 mg/kg in a soil sample from the stained soil layer. Benzo-a-pyrene was measured up to 1.12 mg/kg in soil, slightly above the ingestion cleanup level. Ray Burger
6/2/1997 Update or Other Action Conceptual Site Model approved for the working tank farm (on top of Rocky Point). Ray Burger
10/15/1997 Site Ranked Using the AHRM Surfacewater Usage Value changed from 0.2 to 1.0 and Surface Water Exposure Index Value changed from 0 to 1.0. This is because this site likely contributed contamination to the lake that used to be the town's water supply. Former score was 20. Ray Burger
10/2/1998 Update or Other Action ADEC issued notice of intent to recover costs letters to Chevron and Delta Western. Costs for the Corps portion of the project are covered under the Defense State Memorandum of Agreement (DSMOA). John Halverson
6/11/1999 Site Characterization Workplan Approved ADEC conditionally approved the Site Characterization Workplan - Rocky Point Management Area #1, dated May 1999 (Foster Wheeler). Several ADEC comments on the draft workplan were not addressed adequately and responsible parties were informed they may need to undertake additional investigation later. John Halverson
9/15/2000 Update or Other Action ADEC sent a letter to Chevron, Delta Western and the Corps commenting on the draft Phase I Site Characterization Report, prepared by Foster Wheeler, August 11, 2000. The draft report documents high levels of petroleum contamination in the thermal treatment area, in the APL yard where a 3" diameter fuel line was found to be leaking in ~1993, in a ravine on top of tank hill between UST 14 and 15, and in various locations along the fuel lines. Comments on the draft report need to be addressed, the report finalized and a Phase II site characterization effort is being planned. Two test pits were installed downslope from the Upper Tank Farm; soil samples did not contain elevated contaminant levels. DEC reviewed and commented on the draft report. John Halverson
5/16/2002 Site Characterization Report Approved DEC received the final Phase I/II Site Characterization Report for Rocky Point Management Area #1, by Foster Wheeler, dated May 15, 2002. Petroleum contaminated soil documented in the 1996 site assessment appears to be limited to a localized area beneath the tank farm, which has since been lined for secondary containment. Samples collected from outside the lined tank farm meet applicable cleanup levels. The report recommends a site closure report be prepared. John Halverson
3/30/2009 Update or Other Action DEC received a copy of the "Semi-Annual Area Wide Groundwater Monitoring Report and O&M Report - First Half 2008" from Stantec, on behalf of Chevron. The report documents groundwater level and flow directions, generally stable or decreasing petroleum concentrations in groundwater, the presence of measurable LNAPL in 9 out of 61 monitoring wells that were gauged, residual petroleum contaminated water access tunnels to abandoned underground storage tanks 16, 17 and 18, and work done to maintain and evaluate the interception trench/product recovery system and the oil water separator system. Meghan Dooley
7/31/2009 Update or Other Action DEC received the "Semi-Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - Second Half 2008", from Stantec on behalf of Chevron. 59 monitoring wells were gauged for water level data and 33 MWs were sampled. Samples from three MWs exceeded the cleanup levels for groundwater discharging into surface water; the 30 other MWs did not exceed cleanup levels of 10 times the Table C levels (samples from 5 MWs exceeded the Table C levels). Eight MWs (four of which are in the Pre WWII Tank Farm Area {MW-2, MW-11, MW-13 and MW-16} and four within the Thermal Treatment Area {MWRP-22, MWRP-24, MWRP-28 and IWPZ-07}) contained measurable LNAPL and were not sampled. LNAPL thickness ranged from 0.04' to 2.78'. 5.85 liters of product were removed from the MWs in the Thermal Treatment area. Product mobility and recoverability are being evaluated. Five tank tunnels and ten valve houses have been inspected and water samples collected from them over time. Nine of the valve houses were removed during 2007-08; valve house H remains - no water was present in valve house H during the quarterly inspections. The tank tunnels were not sampled during the 2nd half of 2008. The bioventing system on Tank Hill remained off pending development of an alternative cleanup plan. Sorbent booms in the interception trench and on-site oil water seperator were inspected and replaced as necessary. Soil from the remainder of the Tank 12 stockpile was sampled, met cleanup levels and was moved to a stockpile for beneficial use as on-site fill material. Meghan Dooley
6/23/2010 Update or Other Action The Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2009 was recieved to ADEC. The report addressed groundwater contamination in the Rocky Point Management Area as well as maintenance of structures associated with the remedy. During the first half of 2009, 62 wells were gauged for LNAPL thickness and groundwater depth. Samples were collected from 32 wells and 5 wells exceeded cleanup levels for surface water. Eight wells had residual or measurable thickness of LNAPL, however some of these contained Bunker-C like material and were not removed. In second half 2009, 4 wells were installed during the Site Assessment and incorporated into the groundwater monitoring program. Monitoring was discontinued at Well PC-01 as a new well was installed in the area. Seven wells that were gauged had residual or measurable free product, one of these containing Bunker-C. The installation of MWRP-37 in the APL operations area called for recovery of 83.28 L of product. 57 wells were gauged and 32 were sampled in the second half of 2009. Five wells exceeded surface water cleanup levels in tank Hill area, Petes Creek, APL operations, and Thermal Treatment Area. O&M activities were performed on the OWS, the interceptor trench, tank tunnels, and the sedimentation basin. Boom was replaced as needed. Meghan Dooley
1/23/2012 Document, Report, or Work plan Review - other The Final Soil Management Plan for the Fuel Pipeline Installation was approved. A conditional approval letter was sent on December 12, 2011 contingent on incorporation of final comments into the work plan. A final version of the document was received electronically on December 29, 2011. The final document is approved as all ADEC comments have been addressed and incorporated. Meghan Dooley
4/15/2013 Meeting or Teleconference Held ADEC Contaminated Sites and Industry Preparedness Program staff met with Delta Western and their consultants to plan a path forward for the cleaning and closure of Tanks 12-16 and associated tunnels and piping. Meghan Dooley
8/11/2021 Document, Report, or Work plan Review - other Bulk action for all sites within the Rocky Point Management Area Operational Area Boundaries. ADEC received the Annual Area-Wide Groundwater Monitoring and Operation and Maintenance Report – 2020 for the Rocky Point Management Area in Dutch Harbor, Unalaska on May 26, 2021. Activities included inspection and maintenance of the Thermal Treatment Area (TTA) oil-water separator (OWS) and sedimentation basin; the East Point Loop Road (EPLR) OWS and sedimentation basin; and the TTA groundwater interceptor trench, collection vaults, and surface water drainage culverts. Light nonaqueous-phase liquid (LNAPL) recovery O&M activities at monitoring wells MWRP-24 and MWRP-37 are ongoing, and in 2020 were conducted on a monthly basis at monitoring well MWRP-24 and on a weekly basis at monitoring well MWRP-37. The frequency of the groundwater monitoring and O&M activities at the Rocky Point Management Area (RPMA) was reduced from semiannual to annual in 2019. ADEC recommends MWRP-15 is added to the list of wells to be sampled for Diesel Range Organics (DRO), Gasoline Range Organics (GRO), and Polycyclic Aromatic Hydrocarbons (PAHs). Additionally, ADEC requests some recommendations are provided regarding the access to monitoring wells, particularly those with free product historically observed. Several wells were unable to be sampled due to being located under shipping containers. Responses sent on July 16, 2021. Cascade Galasso-Irish
1/18/2022 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 71466 name: auto-generated pm edit Delta Western Bulk Plant - Dutch H. Cascade Galasso-Irish

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details
Hazard ID Site Name File Number
25576 Delta Western Tank Farm Dutch Harbor 2542.38.031

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