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Site Report: Sitka NOB - Area E - Millerville Housing

Site Name: Sitka NOB - Area E - Millerville Housing
Address: Sitka Naval Operations Base; Japonski Island; 0.5 Miles West of Sitka, Sitka, AK 99835
File Number: 1525.38.020
Hazard ID: 25735
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 57.050990
Longitude: -135.358556
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

The Sitka Naval Operations Base (NOB) consisted of a naval air station, subordinate naval shore activities, radio station, hospital, naval section base, and marine barracks, and was the main Navy floatplane facility in southeastern Alaska during World War II. Current landowners of the former Sitka NOB sites include: Alaska Area Native Health Service; Alaska Department of Education and Early Development; and Alaska Department of Transportation and Public Facilities. The USACE began environmental work at the site in 1991. During the course of the remedial investigations, the site was divided into eleven areas, identified in the Decision Document as: Area A – Power Plant; Area B – Former Army/Navy Service Station; Area C – Water Tower Tank Farm; Area D – Tank Farm No. 1 (Hospital Access Road Tank Farm); Area E – Millerville Housing Area; Area F – Tank Farm No. 2; Area G – Igarotte Housing Area; Area H – Seaplane Dock; Area I – Tank Farm No. 4; Area J – Tank Farm No. 5; and Area K – Tank Farm No. 3. On 9/27/11 the Sitka Naval Operations Base database entry was divided into seven separate records. Original Hazard ID 1992 was renamed from Sitka Naval Operating Base to Sitka NOB - Area F - Tank Farm No. 2, and additional database records were created for Area A - Power Plant; Areas B/C/D/I/J - Frmr Army Navy Service Station, Water Tower TF, TF Nos. 1/4/5; Area E - Millerville Housing; Area G -Igarotte Housing Area; Area H - Seaplane Dock; and Area K Tank Farm No. 3. This site represents: Area E - Millerville Housing. The most significant potential sources of contamination at Area E were the 10,000-gal AST and the underground pipelines that ran through the housing area from the old Navy dock to Tank Farm No. 3 (Area K). DRO, GRO, and lead were the primary contaminants of concern.

Action Information

Action Date Action Description DEC Staff
4/19/1995 Site Characterization Report Approved Phase 1 Remedial Investigation report approved this date. Employee Past
9/1/1995 Update or Other Action Community Relations Plan Employee Past
7/3/1996 Risk Assessment Workplan Approved Risk Assessment work plan approved this date. Employee Past
8/1/1996 Site Characterization Report Approved Phase 2 Remedial Investigation Report approved. Employee Past
3/1/1998 Update or Other Action EE/CA submitted. Employee Past
8/1/1998 CERCLA FS Feasilibility Study submitted. Employee Past
11/20/1998 Risk Assessment Report Approved Risk Assessment Report approved this date. Employee Past
2/23/1999 Cleanup Plan Approved Cleanup Plan approved this date. Cleanup levels approved as interim removal action screening levels. Anne Marie Palmieri
2/24/2000 Interim Removal Action Approved Interim Removal Action approved this date. Over 700 tons of fuel and lead-contaminated soil was removed from three excavations. Four monitoring wells installed in 1995 were sampled in 2001; no exceedences were found. Anne Marie Palmieri
9/27/2002 Cleanup Level(s) Approved DEC approves the 10x groundwater alternative cleanup level based upon a determination that the groundwater is not a current or future source of drinking water. Anne Marie Palmieri
6/8/2004 Cleanup Level(s) Approved Soil cleanup levels approved this date. Cleanup levels correspond with the groundwater 10X rule. Anne Marie Palmieri
4/2/2007 CERCLA ROD Approved John Halverson signed the Declaration of Project Closure Decision and No Dept. of Defense Action Indicated for the CON/HTRW project this date. Anne Marie Palmieri
9/29/2008 Site Characterization Report Approved Final RI Report Addendum approved this date. The report summarizes all of the past information (characterization and cleanup) of the site. No significant areas of contamination remain. No Feasibility Study will be prepared. Preferred alternative is no action. Anne Marie Palmieri
9/24/2009 CERCLA ROD Approved Decision Document signed this date; no additional action is necessary. Anne Marie Palmieri
9/27/2011 Site Added to Database A new site has been added to the database Mitzi Read
9/27/2011 Update or Other Action On 9/27/11 the Sitka Naval Operations Base database entry was divided into seven separate records. Original Hazard ID 1992 was renamed from Sitka Naval Operating Base to Sitka NOB - Area F - Tank Farm No. 2, and additional database records were created for Area A - Power Plant; Areas B/C/D/I/J - Frmr Army Navy Service Station, Water Tower TF, TF Nos. 1/4/5; Area E - Millerville Housing; Area G -Igarotte Housing Area; Area H - Seaplane Dock; and Area K Tank Farm No. 3. Mitzi Read
9/29/2011 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79177 name: Sitka NOB - Area E - Millerville Housing Anne Marie Palmieri
10/21/2011 Cleanup Complete Determination Issued John Halverson signed the USACE Decalaration of Project Closure Decision this date. Anne Marie Palmieri
11/17/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79177 Sitka NOB - Area E - Millerville Housing. Anne Marie Palmieri
4/17/2020 Site Characterization Workplan Approved Staff reviewed and approved a characterization work plan provided by SEARHC intended to identify potential contamination which could impact future land development plans. Fieldwork is scheduled for late spring/early summer 2020. Anne Marie Palmieri
9/4/2020 Site Characterization Report Approved Staff approved a copy of the SEARHC site characterization report on this date. A copy of the letter is included in the attachments. Anne Marie Palmieri
7/9/2021 Document, Report, or Work plan Review - other Reviewed the June 24, 2021 SEARHC Millerville Phase II ESA work plan on this date. This is a landowner driven investigation so DEC did not provide comments/recommendations on the work plan, but is aware that the work is being done later in the month. Evonne Reese
11/23/2021 Document, Report, or Work plan Review - other As a landowner driven investigation and cleanup, in September 2021, RSE worked with Marble Construction to excavate approximately 2,015 tons of hydrocarbon impacted soil from the area surrounding boreholes BH-10, BH-10S, and BH-10S2 at the subject property. Soil was transported to Bicknell in Juneau for thermal treatment and to Republic Services landfill for disposal. The excavation did not reach the extent of the contaminated soil in all directions, but due to project constraints, the excavation was completed and backfilled. A report detailing this effort should be issued in the near future. An additional work plan which describes the methods for installing approximately 30 soil borings with as many as 10 completed as temporary monitoring wells to further delineate contamination in the proposed hospital building footprint area. RSE will collect soil and groundwater samples from these soil borings and monitoring wells. The data collected will be used to further delineate areas of hydrocarbon impacted soil at the site to support planning efforts for the new hospital construction project. DEC has reviewed both work plans but formal approval DEC approval is not required because the investigation is landowner driven. Evonne Reese
3/16/2023 Update or Other Action In preparation for the constructions of a new SEARHC hospital and parking lots, a total of 6,669.53 tons of hydrocarbon impacted soil was transported under ADEC approval to Bicknell, Inc in Juneau, Alaska for thermal treatment in November 2022. A large portion of the project site was excavated down to bedrock to meet the MEMCC project structural requirements. Contaminated soil was left in place at the site in the southern and southeastern portion of the project limits at depths of approximately 5 to 20 feet below ground surface. This contaminated soil was later covered with 5 to 10 feet of clean overburden soil. All impacted material at the site was either removed down to bedrock or will be left in place under parking lots. No impacted material underlies the current new hospital building location or within a minimum of approximately 30 feet horizontally of the new hospital location. A site diagram of the excavations and remaining contaminated soil is attached to this database record. Evonne Reese

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Cleanup level for DRO was set at 2300 mg/kg
Lead - Total < Method 2 Most Stringent Soil
DRO < Table C Groundwater

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.

Missing Location Data

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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