Site Report: Ketchikan Spruce Mill Abandoned USTs
| Site Name: | Ketchikan Spruce Mill Abandoned USTs |
|---|---|
| Address: | Bawden Street, SE of Mill Street, Ketchikan, AK 99901 |
| File Number: | 1516.26.033 |
| Hazard ID: | 25633 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 55.341196 |
| Longitude: | -131.643687 |
| Horizontal Datum: | WGS84 |
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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
In March 2011, Dawson Construction found it necessary to excavate subsurface soil on Lot 10 to install foundation piling for a new fire station. Aboveground vent and fill pipes observed extending from the ground in the construction zone indicated the possibility of underground storage tanks (USTs). Further examination found that one of the USTs contained fuel and the other did not. The empty UST was excavated and transported for storage off-site. The second UST contained a mixture of fuel and water; it was drained then lifted from the excavation and placed between liners on-site. In accordance with 18 AAC 78.090, Alaska Resources and Environmental Services LLC (ARES) performed a site investigation of the two USTs at the construction site on Lot 10A1. All backfilled soils were removed up to the liner and ARES gathered eight samples for field screening by UST Procedure Manual procedures. The highest field screen results were 0.0 parts per million (ppm) and ARES observed no petroleum stained soil in the excavation around the footprint of the USTs. The excavation area was 144 square feet by 6 feet deep resulting in an estimated volume of 100 cubic yards. The four soil confirmation samples including a field duplicate collected from the floor of the excavation were analyzed for gasoline range (GRO) and diesel range organics (DRO) by Alaska Methods and benzene, toluene, ethylbenzene, and xylenes (BTEX) compounds by Environmental Protection Agency (EPA) Method 8021B. The greatest petroleum concentrations detected in confirmation samples from the UST removal excavation Site Assessment are GRO of 15.6 milligrams per kilogram (mg/kg) and DRO of 97.6 mg/kg. No BTEX compounds were found in soil above instrument detection.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 3/25/2011 | Update or Other Action | CS assisted with investigation into abandoned USTs reported by Dawson Construction at the abandoned Spruce Mill location on Bawden south of Mill Street in Ketchikan. The department requires certified tank worker UST closure/removal procedures be followed for abandoned USTs. A former vehicle repair shop contaminated site cleanup at the former Spruce Mill may be affiliated with the USTs. Copies of the 1994 AGI Cleanup Report at the former shop and the DEC site closure letter were forwarded to each of the civil contractors to determine if there is any association between historical release and the abandoned USTs. | Bruce Wanstall |
| 3/30/2011 | Site Added to Database | A new site has been added to the database | Mitzi Read |
| 4/26/2011 | Document, Report, or Work plan Review - other | DEC evaluated Soil Sampling Report for current excavation on Lot 10A1 in the footprint of the former vehicle repair shop that was investigated on Spruce Mill site in 1994. Field screening detected no volatile compounds and the 27.6 mg/kg laboratory test result for the diesel range hydrocarbon indicated weathered petroleum in concentration below Table B2 DRO screening levels. | Bruce Wanstall |
| 9/8/2011 | Leaking Underground Storage Tank Release Confirmed - Petroleum | LUST site created in CSP database for source area Underground Storage Tanks, 79149 | Bruce Wanstall |
| 9/9/2011 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 79149 name: Underground Storage Tanks | Bruce Wanstall |
| 12/6/2011 | Document, Report, or Work plan Review - other | In accordance with 18 AAC 78.090, DEC approves the Alaska Resources and Environmental Services LLC (ARES) site assessment for closure by removal of two USTs that were found abandoned at the construction site on Lot 10A1. All backfilled soils were removed up to the liner and ARES gathered eight samples for field screening by UST Procedure Manual procedures. The highest field screen results were 0.0 parts per million and ARES observed no petroleum stained soil in the excavation around the footprint of the USTs. The excavation area was 144 square feet by six feet deep resulting in an estimated volume of 100 cubic yards. The four soil confirmation samples including a field duplicate collected from the floor of the excavation were analyzed for GRO and DRO by Alaska Methods and BTEX compounds by EPA Method 8021B. The greatest petroleum concentrations detected in confirmation samples from the UST removal excavation Site Assessment are GRO of 15.6 milligrams per kilogram (mg/kg) and DRO of 97.6 mg/kg. No BTEX compounds were found in soil above instrument detection. The Report satisfies 18 AAC 78.276 final reporting requirements for site closure. | Bruce Wanstall |
| 12/6/2011 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 79149 Underground Storage Tanks. | Bruce Wanstall |
| 12/15/2011 | Cleanup Complete Determination Issued | Based on the information provided to date, the DEC has determined that the contaminant concentrations remaining on the property do not pose an unacceptable risk to human health or the environment. This determination is in accordance with 18 AAC 78.276(f) and does not preclude DEC from requiring additional assessment and/or cleanup action if future information indicates that this site may pose an unacceptable risk to human health or the environment. | Bruce Wanstall |
| 12/15/2011 | Leaking Underground Storage Tank Cleanup Initiated - Petroleum | Adminstrative action addition for grant reporting purposes. | Evonne Reese |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | < Method 2 Most Stringent | Soil | maximum concentration for DRO in soil was 97.6 mg/kg |
| GRO | < Method 2 Most Stringent | Soil | maximum concentration of GRO in soil was 15.6 mg/kg |
Control Type
| Type | Details |
|---|---|
| No ICs Required |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. |
| Hazard ID | Site Name | File Number |
|---|---|---|
| 2000 | Ketchikan Spruce Mill | 1516.38.014 |