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Site Report: Harrigan Centennial Hall

Site Name: Harrigan Centennial Hall
Address: Harbor Drive, Sitka, AK 99835
File Number: 1525.38.048
Hazard ID: 25497
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 57.049498
Longitude: -135.332101
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

During the planned decommissioning of a 1,000-gallon underground heating oil tank (UST), a second, unknown tank was discovered. One or both of the tanks were identified as leaking because of diesel contamination; neither tank appeared to have holes in it. Approximately ten cubic yards of contaminated soil were removed from the site. Diesel range organics (DRO) and benzene contamination remains above DEC cleanup levels; they were unable to continue excavating because of possible damage to the building foundations and associated structures. The contaminated soil is tidally influenced.

Action Information

Action Date Action Description DEC Staff
2/22/2010 Spill Transferred from Prevention Preparedness and Response Program Spill transferred by PERP staff Sarah Moore. Spill no. 09119934402; spill date = 12/10/09; substance = diesel; quantity = unknown. Mitzi Read
2/26/2010 Site Added to Database A new site has been added to the database Mitzi Read
3/11/2010 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 78857 name: Underground Heating Oil Tanks Mitzi Read
5/26/2010 Potentially Responsible Party/State Interest Letter DEC issued a letter requesting a site investigation and landfarming design work plan. DEC also informed Cris Wilbur, employee of the city of Sitka of DEC's cost recovery process. Todd Blessing
7/1/2010 Site Visit DEC staff visited the site on June 29, 2010; Latitude and Longitude were evaluated and confirmed and the spill site was observed. DEC staff discussed the visit with Chris Wilber and requested a release investigation. Todd Blessing
12/8/2010 Update or Other Action DEC approved of Carson and Dorn Inc.’s (C&D's) “Site Investigation Work Plan” for Harrigan Centennial Hall. C&D provided a preliminary conceptual site model and proposed to evaluate soil gas and groundwater near and within the former location of the footprint of the former leaking underground storage tank. Soil gas probes would be installed in the footprint of tank 1 and roughly 10 feet north of tank 1 and within 5 feet of Harrigan Centennial Hall. The soil probes would be advanced with a slide hammer or bucket auger to a predetermined depth. Following full advancement of the boring the probe tip would be attached to a barb fitting to collect the gas sample while utilizing a vacuum pump. The proposed work is approved with the following modifications: 1. C&D will follow the procedures for soil gas sampling, analysis and reporting defined in DEC’s vapor intrusion guidance, dated July 2009. 2. One soil probe will be installed within 5 feet of Harrigan Centennial Hall and will be advanced to the same depth as the buildings foundation. The second soil probe shall be advanced to the depth of the former 1,000 gallon LUST. 3. The soil gas probe will be pulled back to expose the inlets after the predetermined depth is reached. 4. During sampling, hydrated bentonite or other surface seal will be utilized to seal the probe, rod, and/or tubing and inhibit ambient air from intruding during sample collection. 5. Sampling and purging flow rates shall be monitored and range between 100 to 2000 milliliters per minute. 6. Sample tubing shall be of small diameter (i.e. ¼ inch) and made of material such as nylon, stainless steel, or Teflon. 7. C&D will document leak test results and take photos of sample train and soil gas probe. 8. C&D will test collect samples at a NELAP approved laboratory for volatile organic compounds by EPA test method TO-15. 9. C&D will also evaluate levels of oxygen and carbon dioxide in purge and/or leak test samples and report results. 10. C&D will update the preliminary conceptual site model (CSM) based on the results of the sampling report and provide the updated CSM in their final report. Todd Blessing
12/8/2010 Update or Other Action DEC reviewed and conditional approved Carson and Dorn Inc.’s (C&D's) “Bioremediation Plan” dated November 2010. Within the plan, C&D provided details of the construction of the bioremediation cell. This cell is 17 feet wide, 14 feet wide long, and has an average soil depth of 12 inches. The bioremediation cell is lined and covered with a 10 millimeter reinforced poly liner. The cell meets CSP requirements for distance criteria for public water systems. On May 19, 2010 the cell was fertilized with high nitrogen fertilizer and the was tilled on May 11, May 19, May 28, June 1, June 15, and June 16, 2010. C&D proposes to till the cell at a similar frequency in 2011. In September 2011, C&D proposes to collect four soil samples plus one duplicate based on establishing a grid system. The soil samples would be analyzed for DRO and RRO by Department approved methods. If soil sample results meet 18 AAC 75.341 Table B2 default values for DRO and RRO then the bioremediation cell will be closed. The proposed work is approved provided that soil samples will be analyzed for VOC by EPA solid waste method 8260B in addition to DRO and RRO. Todd Blessing
4/1/2011 Site Characterization Report Approved DEC staff reviewed Carson and Dorn Inc.’s “Site Investigation Report Harrigan Centennial Hall Site” dated March 2011. This report documented the results of site investigation activities at the Harrigan Centennial Hall Site in Sitka, Alaska. During January 2011, Carson and Dorn (C&D) installed two shallow soil gas probes, and installed a groundwater monitoring well. C&D installed a soil gas probe (SG-1) to a depth of 2 feet bgs, adjacent to the Harrigan Centennial Hall and a second soil gas probe (SG-2) was installed within the footprint of the former underground storage tank (UST) excavation. After the soil gas probes were leak tested and purged, soil gas samples were collected from each probe and analyzed for volatile organic compounds (VOCs) utilizing EPA’s TO-15 method. Acetone and methylene chloride were the only VOCs detected in these samples and they were not detected at levels that exceed DEC shallow soil gas vapor intrusion target levels. The groundwater monitoring well (MW-1) was installed within the footprint of the former UST excavation. Following well development and purging, groundwater samples were collected to be analyzed for DRO, RRO, and VOCs by CSP approved methods. In these samples, DRO was the only contaminant of concern detected above CSP cleanup criteria. DRO was detected at a level of 5.75 mg/L. DEC issued a letter on April 1, 2011 requesting the City & Burough of Sitka issue a groundwater monitoring plan to DEC by August 31, 2011. The groundwater monitoring plan should define the means and methods to to determine groundwater flow direction and the extent of groundwater contamination. Todd Blessing
5/16/2011 Site Characterization Workplan Approved DEC staff reviewed and approved Carson and Dorn's (C&D's) "Groundwater Sampling and Analyis Plan" dated May 2011. C&D proposed to install and sample three additional monitoring wells in accordance with ADEC field sampling guidance. Groundwater samples will be analyzed for DRO and BTEX according to DEC approved methods. Todd Blessing
2/10/2012 Update or Other Action Transferred to Juneau CS Office to Sally Schlichting on 2/10/2012 Susan Carberry
5/4/2012 Cleanup Plan Approved A review of the Site's Groundwater Monitoring Sampling Results report was completed and approved. DEC requests that because the groundwater at the site is subject to tidal influence from nearby surface water total aromatic hydrocarbons (TAH) criteria and total aqueous hydrocarbons (TAqH) criteria must be met in water samples collected from the groundwater at this site that may be tidally influenced by nearby marine waters, in order to show that the migration to surface water pathway is protected. The next sample event is tentatively scheduled in September 2012. DEC request that samples are collected from all four monitoring wells to determine concentrations of total aromatic hydrocarbons TAH and TaqH in addition to DRO, RRO and BTEX. Denise Elston
6/5/2012 Site Visit CSP staff performed a site visit. Staff inspected installed monitoring wells. Upcoming sampling for fall 2012 was discussed with consultant. Denise Elston
7/17/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for the Harrigan Centennial Hall Denise Elston
9/18/2013 Cleanup Complete Determination Issued Petroleum contamination remains onsite above applicable cleanup levels, however; DEC has determined there is no unacceptable risk to human health or the environment as long as the contamination is properly managed. This site will receive a Cleanup Complete with Institutional Controls designation on the Contaminated Sites Database Denise Elston
9/23/2013 Institutional Control Record Established Institutional Controls established and entered into the database. Denise Elston
6/25/2014 Institutional Control Update Received confirmation from Carson Dorn, Inc. that the two groundwater monitoring wells have been decommissioned. Evonne Reese
9/8/2014 Document, Report, or Work plan Review - other Received and reviewed notice and a request submitted by the City and Borough of Sitka Public works for anticipated removal of 5-15 cubic yards of contaminated soil that may be encountered as a result of utility and remodel work at this facility over the next three years. Proposal is to transport the material to a bioremediation cell at the Granite Creek facility. Issued conditional approval; contingent on submittal of offsite transport request forms as the soil is encountered. Sally Schlichting
4/17/2017 Institutional Control Compliance Review IC compliance review conducted. Closure/IC Details updated. Reminder system set for the five-year review of land use to occur in 2018. Kristin Thompson
12/5/2018 Institutional Control Update Institutional Controls Verification Letter sent to responsible party via e-mail with recv'd receipt from server Mossy Mead
9/21/2023 Institutional Control Compliance Review IC compliance review completed on 9/21/2023 and an IC reminder letter was issued to the landowner. Livia Bracker

Contaminant Information

Name Level Description Media Comments
DRO > Human Health/Ingestion/Inhalation Soil Soil contamination remains in the subsurface above Table 2 Method 2 Over 40 Inch Zone, Maximum Allowable Concentrations below the excavated tank area. DRO concentrations of 23,300 mg/kg (22,000 mg/kg-duplicate) were detected at approximately 7.4 ft bgs near the building foundation and remain at an unknown volume.
Benzene < Table C Groundwater CSP requested CDI to submit a groundwater monitoring plan. In May 2011, three wells were installed to monitor for site contamination (MW-1, MW-2 and MW-3) and one to monitor for potential upgradient contamination (MW-4). On June 12, 2011 groundwater sampling for DRO, RRO and BTEX was conducted. This event was performed during a high tide (10.70ft) however; productivity of MW-1, MW-2, and MW-4 was insufficient and the wells could not be sampled. As a result, only MW-3 was sampled and the analytical results showed that DRO and RRO were detected below DEC groundwater cleanup criteria and BTEX constituents were non-detect. In September 2011, a second round of groundwater monitoring was conducted at all wells and for the same parameters. No constituents were detected in MW-2, MW-3, and MW-4, however; MW-1 had detectable concentrations of DRO below DEC groundwater cleanup levels and both RRO and BTEX were non-detect.

Control Type

Type Details
Signed CS Determination 1. Groundwater monitoring wells must be decommissioned by November 15, 2013 in accordance with DEC guidance. Submit well decommissioning documentation to DEC within 30 days. 2.Any future change in land use may impact the exposure assumptions cited in this document. If land use and/or ownership changes, these management conditions may not be protective and DEC may require additional remediation and revised conditions. Therefore the City and Borough of Sitka shall report to DEC every 5 years to document land use, or report as soon as the City and Borough of Sitka becomes aware of any change in land ownership and/or use, if earlier

Requirements

Description Details
Other The City and Borough of Sitka shall report to ADEC every 5 years to document land use, or report as soon as they become aware of any change in land ownership and/or use, if earlier.
Advance approval required to transport soil or groundwater off-site. Standard condition.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70) Standard condition.

No associated sites were found.

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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
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