Site Report: Mendenhall Mall HOTs
| Site Name: | Mendenhall Mall HOTs |
|---|---|
| Address: | 9105 Mendenhall Mall Road, Juneau, AK 99801 |
| File Number: | 1513.38.073 |
| Hazard ID: | 4448 |
| Status: | Cleanup Complete |
| Staff: | No Longer Assigned, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 58.371460 |
| Longitude: | -134.589380 |
| Horizontal Datum: | NAD83 |
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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
Petroleum contamination was identified on the ground surface around fill pipes at two of three underground heating oil tanks on the south side of the Mendenhall Mall building. Cleanup excavation of contaminated material in May 2007 was coordinated with Southeast Area Response Team (SART). Soil at the excavation limits at underground storage tanks (USTs) #1 and #3 had diesel range organics (DRO) concentration below ADEC cleanup levels but for UST #2 (behind the Gottschalks generator room) electric conduits and a transformer prevented all of the contamination from being removed. Contaminated material remaining below the surface at the UST #3 site has a DRO concentration of 1,580 milligrams per kilogram (mg/kg). Groundwater contamination was also noted. Samples were not analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX) constituents. There was apparently no indication that the fuel tanks were leaking but additional testing of the area is recommended.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 7/30/2007 | Spill Transferred from Prevention Preparedness and Response Program | Site transferred by PERP staff Scot Tiernan. Spill Date = 10/2/06; Spill No. 06119927502; Substance = Diesel; Quantity = unknown; PERP file number = 1513.02.324. | Mitzi Read |
| 8/14/2007 | Exposure Tracking Model Ranking | Initial ranking completed. | Mitzi Read |
| 8/14/2007 | Site Added to Database | Site added to the database. | Mitzi Read |
| 9/28/2007 | Exposure Tracking Model Ranking | A meeting was held at the site with the environmental consultant and the buried tank owner to discuss how the ADEC views the current situation and what action can be taken by the outgoing owner to eventually bring the site to unconditional closure | Bruce Wanstall |
| 10/4/2007 | Site Characterization Workplan Approved | After thorough review of existing report data the ADEC approves the workplan proposed by Carson Dorn Inc for Mall PSA, LLC. Conceptual Site Model is requested and lab data quality checklist requested on all future data submitted. | Bruce Wanstall |
| 10/16/2007 | Meeting or Teleconference Held | ADEC held a discussion with the owner's consultant about the site conceptual site model and monitoring well installation for the ground water assessment workplan at the Mall UST site. | Bruce Wanstall |
| 1/7/2008 | Document, Report, or Work plan Review - other | ADEC received a letter/report from CDI concerning ground water well installation and sampling at UST#2 at the Mendenhall Mall in December 2007. Digital images, a laboratory report and data checklist referenced in the letter/report were forwarded by email on 12/28/07. Data show that diesel and residual range hydrocarbon concentrations detected in ground water are below regulatory levels. Laboratory data is acceptable to ADEC standard; conditions appear to be stable but a plan for a second sell sampling in 2009 is requested. | Bruce Wanstall |
| 5/9/2008 | Update or Other Action | ADEC requested that the responsible party submit a workplan for sequential well sampling to establish a concentration trend for regulatory site closure. | Bruce Wanstall |
| 5/21/2008 | Document, Report, or Work plan Review - other | CDI report/letter and laboratory report meet the Contaminated Sites Program Quality Assurance standards. Water sample analysis for DRO (1.69mg/L) is above ground water cleanup level (1.5mg/L) and RRO (4.90mg/L) is above ground water cleanup criteria (1.1mg/L). The data reflect an increase since the December sampling event at the UST#2 behind the Mall. Oil stain was noted around the base of the monitoring well pipe; fouling of the monitoring well by fuel handlers is strongly suggested. | Bruce Wanstall |
| 7/28/2009 | Document, Report, or Work plan Review - other | ADEC reviewed and approved a workplan to clean and close UST#2 in-place, then install a new above ground fuel tank and a new ground water monitoring well. The ground water sampling plan includes four consecutive quarters of sampling and analysis of ground water for DRO and RRO. | Bruce Wanstall |
| 12/4/2009 | Potentially Responsible Party/State Interest Letter | DEC letter was sent to potential responsible parties introducing the state statutes and regulations that outline responsibilities as landowner (or operator) to evaluate the environmental problems concerning petroleum contaminated groundwater and soil on the property and liability for costs incurred by the state in providing cleanup oversight. | Bruce Wanstall |
| 2/3/2010 | Update or Other Action | DEC assisted the former owner of the Mendenhall Mall HOTs facility with cost recovery questions via electronic mail | Bruce Wanstall |
| 2/3/2010 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 75435 Petroleum at HOTs 1, 2, and 3. | Bruce Wanstall |
| 4/1/2010 | Update or Other Action | Check Received $2138.20 from Law 03/02/10 | Traci Nebeker |
| 11/4/2011 | Exposure Tracking Model Ranking | A new updated ranking with ETM has been completed for source area 75435 Petroleum at HOTs 1, 2, and 3. | Bruce Wanstall |
| 12/12/2011 | Cleanup Complete Determination Issued | The cleanup actions to date have served to excavate and adequately remove contaminated soil from the site. Based on the information available, DEC has determined no further assessment or cleanup action is required. This determination is in accordance with 18 AAC 75.380(d) 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 |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation | Soil | The excavation of contaminated material surrounding UST #2 was limited by the presence of a transformer and electric conduits overlying the tank. The removal of contaminated soil was advanced by machine and then by hand around UST #2. Soil confirmation samples were collected at the base of the building foundation at four feet below grade, and also at the far end of the excavation three feet below grade. The laboratory results for DRO concentration in the two soil samples were 143 mg/kg and 1,580 mg/kg. |
| DRO | < Table C | Groundwater | Samples collected from the monitoring well were submitted to the laboratory for DRO and residual (RRO) hydrocarbon analysis by Alaska Methods 102 and 103. Sample MM-1 results were a DRO concentration of 0.668 mg/L and an RRO concentration of 0.763 mg/L; the duplicate sample MM-2 results were a DRO concentration of 0.551 mg/L and the RRO concentration was below instrument detection limit of 0.708 mg/L. Each of the results is below the 18 AAC 75.345, Table C groundwater cleanup levels. |
Control Type
| Type | Details |
|---|---|
| No ICs Required |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. |
No associated sites were found.