Site Report: USPS Sitka UST 1
| Site Name: | USPS Sitka UST 1 |
|---|---|
| Address: | 1207 Sawmill Creek Road, Sitka, AK 99835 |
| File Number: | 1525.26.031 |
| Hazard ID: | 27515 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 57.049587 |
| Longitude: | -135.311682 |
| 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
A 3,000-gallon diesel underground storage tank (UST 1) was removed on November 12, 2019 at the United States Postal Service (USPS) facility at 1207 Sawmill Creek Road in Sitka. The UST was originally installed on June 23, 1986 on the east side of the Post Office building. An ADEC "Notice of Intent to Close or Change in Service Form" was submitted to the Department in accordance with 18 AAC 78 and on September 12, 2019 ADEC issued an "Authority to Proceed Letter" that authorized UST closure between October 1, 2019–December 10, 2019. UST closure activities included field screening and analytical sample collection. Approximately 50 cubic yards of potentially-contaminated soil were stockpiled. One sample exceeded the Table 2B migration to groundwater (MTG) cleanup level for naphthalene. All other sample results were either non-detect or below the Table 2B MTG cleanup levels for gasoline range organics, diesel range organics, residual range organics, volatile organic compounds, and polycyclic aromatic hydrocarbons. The exact cause of the release is unknown.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 6/10/2021 | Underground Storage Tank Site Characterization or Assessment | Approval Letter for the USPS UST Closure Site Assessment Report sent. Work plan due on July 15, 2021. | Julie Fix |
| 6/11/2021 | Update or Other Action | Workplan deadline extension granted per RP request. Workplan is now due on July 31, 2021. | Julie Fix |
| 6/14/2021 | Site Added to Database | A new site has been added to the database | Mitzi Read |
| 6/14/2021 | Leaking Underground Storage Tank Release Confirmed - Petroleum | LUST site created in CSP database for source area 3,000-Gallon Diesel UST 1, 80954 | Mitzi Read |
| 6/15/2021 | Potentially Responsible Party/State Interest Letter | PRP letter sent. | Julie Fix |
| 7/27/2021 | Document, Report, or Work plan Review - other | "Release Investigation/Interim Corrective Actions Work Plan" received on this date. | Julie Fix |
| 7/30/2021 | Exposure Tracking Model Ranking | Initial ranking with ETM completed for source area id: 80954 name: 3,000-Gallon Diesel UST 1 | Julie Fix |
| 8/12/2021 | Site Characterization Workplan Approved | "Release Investigation/Interim Corrective Actions Work Plan" approved on this date. The work plan proposes excavating a test pit and collecting samples from the location of SIT_003 to determine the vertical and horizontal extent of naphthalene contamination. A minimum of six analytical soil samples (including one duplicate) will be collected and analyzed for DRO and PAHs. Field personnel will dig additional step-out pits based on field screening results from the proposed sampling location. The investigation of groundwater contamination may be required if the results of this field effort indicate that soil contamination remains above the MTG cleanup level. | Julie Fix |
| 9/7/2021 | Update or Other Action | Request from consultant to use excavation as a method of installation for the monitoring wells at this site. ADEC granted approval on this date for changes to the workplan. Monitoring wells will be installed using excavation due to the shallow groundwater table, amenable geology, and remote location as it pertains to available drill rigs. | Julie Fix |
| 1/27/2022 | Document, Report, or Work plan Review - other | The "Release Investigation and Final Corrective Action Report" was received on this date. Comments sent to RP and consultant via email on 5/13/2022. A final CAR was received via email on 5/26/2022. | Julie Fix |
| 3/31/2022 | Leaking Underground Storage Tank Cleanup Initiated - Petroleum | Action addition for grant reporting purposes. | Evonne Reese |
| 6/30/2022 | Final Cleanup Report Reviewed | The "Release Investigation and Final Corrective Action Report" was approved on this date. A test pit in the location of the former UST was advanced to bedrock at 8-10 feet bgs. Six soil samples were collected and analyzed for DRO and PAHs. All samples were non-detect for both DRO and PAHs, including naphthalene. The report requests that the site be considered for closure. | Julie Fix |
| 6/30/2023 | Cleanup Complete Determination Issued | Soil contamination at this site has been cleaned up to concentrations below the approved cleanup levels suitable for residential land use without Institutional Controls. | Julie Fix |
| 7/5/2023 | Update or Other Action | ETM updated ranking available. | Julie Fix |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| Naphthalene | < Method 2 Most Stringent | Soil |
Control Type
| Type | Details |
|---|---|
| No ICs Required |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. | |
| 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) |
No associated sites were found.