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Site Report: 10th Street Tesoro

Site Name: 10th Street Tesoro
Address: 920 West 10th Street, Juneau, AK 99801
File Number: 1513.26.080
Hazard ID: 26549
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229
Latitude: 58.301595
Longitude: -134.423835
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.


The station began operations in 1987 and includes four 12,000-gallon underground storage tanks(USTs 1-4) that supply three grades of gasoline and diesel fuel. In March 2016, petroleum-contaminated soil was encountered during upgrades to the six fuel dispensers at the 10th Street Tesoro in Juneau. The distribution system upgrades included installation of containment sumps beneath each dispensers well as pressure testing of fuel lines. The release(s) may have occurred during previous maintenance of the dispenser fuel filters and possibly from spills during vehicle fueling activities. Remedial activities included excavation of ~7 cubic yards of petroleum-contaminated soil from beneath each dispenser to the extent possible without destabilizing existing infrastructure. Groundwater was not affected.

Action Information

Action Date Action Description DEC Staff
4/20/2016 Report or Workplan Review - Other Rec'd the SARI on this date. On 5/2/16, I requested that the UST program's comments be addressed and that the report be resubmitted. Danielle Duncan
4/22/2016 Site Added to Database A new site has been added to the database Mitzi Read
4/22/2016 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST site created in CSP database for source area Fuel Dispenser Upgrades, 79908 Mitzi Read
4/22/2016 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79908 name: Fuel Dispenser Upgrades Mitzi Read
4/28/2016 Update or Other Action Gave approval today via email to transport the contaminated soil from the Delta Western facility to the AML dock for shipment to the disposal facility. Receipt/certification of disposal will be sent to me when provided. Danielle Duncan
5/2/2016 Update or Other Action Delta Western is going to address R. Weimer's comments and resubmit the SARI to me. Danielle Duncan
5/20/2016 Potentially Responsible Party/State Interest Letter Danielle Duncan
5/20/2016 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79908 Fuel Dispenser Upgrades. Danielle Duncan
5/23/2016 Report or Workplan Review - Other Rec'd Monitoring Well Installation Work Plan/ Sampling and Analysis Plan May 2016. Danielle Duncan
6/2/2016 Site Characterization Workplan Approved Approved the work plan Monitoring Well Installation Work Plan/ Sampling and Analysis Plan May 2016 submitted by ISM Technical Services on behalf of Delta Western Inc. The work plan outlines the installation of two (2) groundwater monitoring wells to determine the extent (if any) of groundwater contamination due to leaks during gas station operation. Danielle Duncan
6/15/2016 Update or Other Action The locations of the monitoring wells have been modified to avoid traffic at the gas station. Danielle Duncan
9/16/2016 Site Characterization Report Approved Approved the Juneau 10th Street Tesoro Station: Monitoring Well Installation/Groundwater Monitoring Report (Report), dated September, 2016 and received in our office on 9/14/16. No contaminants of concern greater than DEC cleanup levels were detected in soil or groundwater collected on site during this sampling event. Danielle Duncan
9/20/2016 Update or Other Action Sent a follow-up letter to the recent groundwater sampling report. Site closure cannot be achieved at this time because the diesel range organics (DRO) contamination in soil on site exceeds the maximum allowable. The groundwater on site should be sampled quarterly in order to establish a trend. Additionally, it may be useful to add a third groundwater monitoring well on the north side of the fuel dispensers. Danielle Duncan
9/30/2016 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Administrative action addition for grant reporting purposes. Evonne Reese
10/3/2016 Meeting or Teleconference Held Teleconference with Delta Western and ISM to discuss roadblocks to site closure: the maximum allowable concentration is exceeded for DRO at 13,800 mg/kg. There are 2 monitoring wells on site and these tested non-detect for hydrocarbons, however these are not located within the zone of contamination due not wanting to have the well damaged as a result of on-going fueling operations. Before site closure, a trend must be established showing that the contamination is not migrating off-site. Danielle Duncan
10/31/2016 Update or Other Action The options moving forward for the site are: 1. Complete a new MW installation and sample – look for a trend (unknown amount of time)- site closure can happen with data gaps filled in 2. Dig up the concrete and remove the estimated 1-2 cubic feet of material -site closure can happen after removal 3. Leave the site as is-open- and when or if any opportunity arises to either remove the soil or complete another MW then and only then can site closure happen. Danielle Duncan
2/1/2017 Report or Workplan Review - Other Approved the work plan to excavate the soil where the contamination is above the maximum allowable. The work will occur in mid-April. Danielle Duncan
11/16/2017 Update or Other Action Expecting a report soon. Danielle Duncan
1/19/2018 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79908 Fuel Dispenser Upgrades. Danielle Duncan
1/22/2018 Report or Workplan Review - Other Reviewed and approved the Juneau 10th Street Tesoro Station: Excavation of POL Soils Report. The soil having petroleum concentrations greater than the maximum allowable has been excavated and disposed of. Danielle Duncan
2/14/2018 Public Notice NOTICE OF ENVIRONMENTAL CONTAMINATION AND INSTITUTIONAL CONTROLS As required by the Alaska Department of Environmental Conservation, pursuant to 18 AAC 75.375, Delta Western Incorporated, the Landowner of the subject property, hereby provides public notice that the property located at: 920 West 10th Street Juneau, Alaska, 99801 and more particularly described as follows: Section 23 of Township 41 South, Range 67 East of the Copper River Meridian. Lot 4 Block 6A of the Urban Renewal Subdivision City and Borough of Juneau Parcel #1C060U060030. has been subject to a discharge or release and subsequent cleanup of oil or other hazardous substances, regulated under 18 AAC 75, Article 3. This release and cleanup are documented in the Alaska Department of Environmental Conservation (ADEC) contaminated sites database at under the site name 10th Street Tesoro and Hazard ID number 26549. ADEC determined, in accordance with 18 AAC 75.325 – .390 site cleanup rules, that cleanup has been performed to the maximum extent practicable even though residual petroleum contamination of soil below the concrete fueling pad exists on-site. Further cleanup was determined to be impracticable without compromising the canopy structure above the fueling island. The site is capped with asphalt and concrete therefore, the contaminated soil is inaccessible. Danielle Duncan
2/14/2018 Cleanup Complete Determination Issued Danielle Duncan
2/14/2018 Institutional Control Record Established Institutional Controls established and entered into the database. Danielle Duncan
5/22/2018 Institutional Control Compliance Review Staff changed from Danielle Duncan to IC Unit. IC compliance review conducted. Closure/IC Details added to reflect the conditions established in the 2/14/2018 Cleanup Complete Determination - Institutional Controls Decision Document. Reminder system set to follow-up on land use conditions every five years. Kristin Thompson

Contaminant Information

Name Level Description Media Comments
BTEX Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil All remaining contamination is capped below concrete.
GRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil All remaining contamination is capped below concrete.
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil All remaining contamination is capped below concrete

Control Type

Type Details
Notice of Environmental Contamination (Deed Notice)


Description Details
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.
When Contaminated Soil is Accessible, Remediation Should Occur In the event that the remaining contaminated soil becomes accessible in the future due to the canopy and fueling island being removed, the land owner shall notify ADEC and characterize and, if determined necessary, cleanup the soil.
Groundwater Use Restrictions No drinking water wells may be drilled on site.
Restricted to Industrial / Commercial Land Use The property shall not be used for residential purposes including use for child day care, educational facilities, playgrounds, hospitals or similar facilities.
Other The landowner must notify the ADEC prior to any sale or transfer of the property and shall report to ADEC every five years to document the status of compliance with the institutional controls.
Other Standard condition.

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