Site Report: Residence - Observatory St. HHOT
| Site Name: | Residence - Observatory St. HHOT |
|---|---|
| Address: | 214 Observatory Street, Sitka, AK 99835 |
| File Number: | 1525.38.003 |
| Hazard ID: | 3277 |
| Status: | Cleanup Complete - Institutional Controls |
| Staff: | IC Unit, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 57.052056 |
| Longitude: | -135.334889 |
| Horizontal Datum: |
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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
Historical leakage and containment failure resulted in a release of 500-900 gallons of heating oil from an above ground tank. Interim removal excavated 70 cubic yards of oily surface soil. Analyticals on pit closure soil samples indicate successful removal of off-site contamination. On-site samples indicate residual soil impacts above Method 2 cleanup levels remain in place beginning at the residence foundation where further excavation threatened the stability of the structure. Contaminated soil was limited vertically by a dense volcanic ash layer present at approximately four feet below ground surface. Due to the inconsistent presence of groundwater beneath these properties, monitoring wells will not be required to show that regulatory concentrations of petroleum in the groundwater are attained. 70 cubic yards of contaminated soil was transported to the USR Juneau facility and thermally remediated.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 10/10/2001 | Site Added to Database | Heating oil spill case transferred from Preparedness and Emergency Response Team (PERP). | Bruce Wanstall |
| 10/10/2001 | Site Ranked Using the AHRM | Preliminary Ranking. | Bruce Wanstall |
| 11/25/2003 | Institutional Control Record Established | Contaminated material shall be investigated and appropriately managed or removed in accordance with DEC cleanup requirements at such time if and when it becomes accessible through major structural modifications or demolition of current structures on the property. On-site samples indicate residual soil impacts above Method 2 cleanup levels remain in place beginning at the residence foundation where further excavation threatened the stability of the structure. III. If Groundwater supply wells will not be installed on this property. | Bruce Wanstall |
| 11/25/2003 | Conditional Closure Approved | Property restrictions are in effect until such time that contaminant concentrations in soil are shown to meet the most stringent cleanup criteria. Decision letter is located at: G:\SPAR\Spar-Contaminated Sites\38 Case Files (Contaminated Sites)\1525 Sitka\1525.38.003 Observatory Street Spill-Sitka/ NFRAP Decision Observatory Street. | Bruce Wanstall |
| 2/27/2004 | GIS Position Updated | Updated lat/long data using GPS readings from Bill Janes 2/13/04 field trip. | Cliff Walden |
| 12/13/2013 | Institutional Control Compliance Review | IC compliance review conducted. Scheduled for an IC reminder letter to be issued to the RP. | Evonne Reese |
| 8/15/2014 | Institutional Control Update | An IC reminder letter was issued to the responsible party on this date. | Kristin Thompson |
| 8/27/2014 | Institutional Control Update | Received a call from the current landowner. There has been a change in ownership due to inheritance. The landowner information has been updated in the Affiliates information. | Evonne Reese |
| 12/20/2018 | Institutional Control Update | An IC verification letter was issued to the responsible party/landowner on this date. | Mossy Mead |
| 10/27/2021 | Institutional Control Update | Received notice that a quitclaim deed was recorded which changes the landowner. Details are included in the Affiliates records for this site. | Evonne Reese |
| 8/19/2024 | Institutional Control Compliance Review | IC compliance review completed on this date. An IC reminder letter was issued to the landowner. The next review will be in three years’ time. | Gaige Robinson |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation | Soil |
Control Type
| Type | Details |
|---|---|
| CS Database Notation And Letter To Landowner/RP |
Requirements
| Description | Details |
|---|---|
| When Contaminated Soil is Accessible, Remediation Should Occur | Concentrations of DRO above the most conservative Method 2 Migration to Groundwater Cleanup Level of 230ppm remain in soil beneath the southeast corner of the residence near the spill release from the tank. Soil contamination reached 9200ppm DRO and will require further evaluation. Contaminated material shall be investigated and appropriately managed or removed in accordance with DEC cleanup requirements at such time if and when it becomes accessible through major structural modifications or demolition of current structures on the property. |
No associated sites were found.