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Site Report: Rainbow Valley Mobile Home Park Trailers/Lots 2 & 3 HHOT

Site Name: Rainbow Valley Mobile Home Park Trailers/Lots 2 & 3 HHOT
Address: 14 Division Street, Trailers/Lots 2 & 3, Fairbanks, AK 99712
File Number: 100.38.222
Hazard ID: 25369
Status: Active
Staff: Shawn Tisdell, 9074512752 shawn.tisdell@alaska.gov
Latitude: 64.889866
Longitude: -147.616202
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.

Problems/Comments

On January 29, 2008 a release of #1 heating oil (arctic grade diesel) was discovered at trailer/lot #2. The site has a 1,000-gallon aboveground storage tank and an adjacent 300-gallon underground storage tank. A heating service company connected the tiger loop line to the wrong tank, mistakenly joining the line to the UST. During the operation of the furnace, fuel from the 1,000-gallon AST was pumped into the 300-gallon UST, causing an overflow of the tank and release to the surface through the vent and/or fill pipes. Prior to the release, the AST had a recent fuel delivery of 500 gallons. The release was estimated at 200 gallons. The release appeared to travel beneath the adjacent trailer/lot (#3). Initial remediation activities included: 3/7/08 removal of snow/ice and leaf litter to a containment cell at 2775 Phillips Field Road, 3/23/08 excavation and stockpiling of ~40 cubic yards of contaminated soil at 2775 Phillips Field Road, 7/26/08 excavation, and 10/7/08 removal of the 300-gallon UST and an additional ~20 cubic yards of contaminated soil.

Action Information

Action Date Action Description DEC Staff
2/6/2008 Potentially Responsible Party/State Interest Letter PRP letter sent to landowner and to Enco Heating. Janice Wiegers
3/3/2009 Spill Transferred from Prevention Preparedness and Response Program Site transferred by PERP staff John Ebel. Spill no. 0839902901; spill date 1/29/08; substance = diesel #1; quantity = ~200 gallons; PERP file no. 100.02.301. Mitzi Read
3/5/2009 Site Added to Database A new site has been added to the database Mitzi Read
3/6/2009 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 78730 name: Overfill of 300-gallon UHOT from 1,000-gallon AHOT - Diesel #1 Mitzi Read
2/4/2010 Update or Other Action Received call from Susan Peters about drinking water well. Reviewed location of wells in the area based on information from the DEC drinking water program. Left voice mail messages with S. Peters but have not received a follow-up call. Janice Wiegers
2/9/2010 Update or Other Action Sent letter to Enco Heating requiring a workplan for further characterization and a CSM. Janice Wiegers
3/23/2010 Update or Other Action Letter to Enco Heating returned unclaimed. Janice Wiegers
5/24/2012 Update or Other Action Sent another letter to Enco Heating requesting completion of the site characterization work. Janice Wiegers
6/4/2012 Update or Other Action Letter to Enco heating returned as "not deliverable as addressed". Janice Wiegers
3/19/2015 Update or Other Action Sent letter to B&D Enterprises, owner of Rainbow Valley Mobile Home Park, describing site and requesting update by May 30, 2015. Janice Wiegers
4/25/2017 Update or Other Action Reviewed information regarding status of Enco Heating and other possible related companies. Enco Heating seems to no longer be in business. Was unable to located registered agent. Janice Wiegers
10/5/2017 Update or Other Action Checked with DEC Drinking Water staff regarding sampling of public drinking water well. Last sample was collected in 2013 and did not contain any detectable petroleum compounds. Janice Wiegers
1/11/2019 Workplan Requested Mailed correspondence to landowner requesting work plan by March 1. Megan Roberts
2/5/2019 Workplan Requested Mailed correspondence to previous unlocated RP requesting a work plan by March 15. Megan Roberts
3/14/2019 Update or Other Action Received request for a 30 day extension for the DEC requested site characterization work plan from the RP's insurance company so they can conduct a coverage review. Extension approved. Megan Roberts
4/29/2019 Update or Other Action DEC received notification that an environmental consultant was in the process of developing a work plan with a goal of May 15th submission date. DEC Project Manager granted approval for May 15th as new deadline for a site characterization work plan. Megan Roberts
5/2/2019 Update or Other Action DEC received a request for site closure based on a meeting memo from environmental consultant files from 2008 that were not in the public file located at DEC offices in Fairbanks. The request was made due to environmental consultants claim of older fuel release although analytical data from 2008 indicate fresher fuel release. DEC denied the request for closure due to: memo not included in site file thus not providing DEC staff time to review and provide relevant comments regarding assumptions, as discussed previously with environmental consultant DEC to look to responsible party to prove existence of historical contamination and to delineate area of historical versus new contamination, and analytical data from 2008 is indicative of fresher fuel release. Megan Roberts
1/23/2020 Document, Report, or Work plan Review - other ADEC staff conducted a review of a November 8, 2019 Sampling and Analysis Plan for air monitoring at the site. A request was made in the ADEC letter reviewing the plan to address site characterization objectives including the delineation of the horizontal and vertical extent of contamination and additional evaluation of the vapor intrusion pathway. Shawn Tisdell
1/31/2020 Meeting or Teleconference Held Meeting between State Farm Insurance representative, consultants from Travis Peterson Environmental Consulting, and DEC staff to discuss modifications to the November 2019 sampling and analysis plan. Proposed activities include gaining site access and revising the work plan after adjusting for current site observations. Shawn Tisdell
10/5/2020 Site Visit DEC staff met with consultant to observe current site status and determine potential cleanup action. Action will include delineation of remaining contamination through the source area and at up and down gradient locations. Shawn Tisdell
11/3/2020 Document, Report, or Work plan Review - other Sampling and Analysis Plan for additional site characterization of contamination remaining at the site was reviewed and comments were provided. A letter was sent out requesting responses to the comments and updates to the proposed plan. Shawn Tisdell
11/10/2020 Document, Report, or Work plan Review - other DEC staff reviewed the November 2020 Sampling and Analysis plan v1.1 for collecting soil samples to delineate contamination remaining at the site. Shawn Tisdell
6/22/2021 Site Visit ADEC project manager visited site to observe soil sampling and documentation methods. Three borings were advanced following the approved work plan. One boring was placed through the source area, one was placed up-gradient and one was placed down gradient to the release along a nearby trailer. A photoionization detector was used to screen headspace samples for total volatile organic compounds (VOCs). The source area boring had VOCs approximately 400 ppm at 2 feet, increasing up to 1100 ppm at 8 feet and decreasing to low single digits at 24 feet. No VOCs were observed with the PID at the other two locations. Two soil samples were collected from each boring and will be analyzed for GRO, DRO, VOCs and PAHs. One additional sample was collected from beneath the source area trailer near the source area at a depth of 12". Shawn Tisdell
7/22/2021 Offsite Soil or Groundwater Disposal Approved Signed Transport and Treatment Disposal Form providing ADEC approval for managing the estimated 0.5 cubic yards of investigative derived waste from the soil investigation last month. Shawn Tisdell
12/13/2021 Document, Report, or Work plan Review - other Site characterization report reviewed by ADEC staff. Purpose was to investigate whether fuel contamination following the 1/2008 release continues to impact the site. Three borings and one hand core were advanced at the site. Boring B1 was advanced to 24 feet below ground surface (fbgs)through or immediately adjacent to the initial release location. Impacted soil was observed in B1 from 2 to 20 fbgs with diesel range organics (DRO) observed in the 8 fbgs sample above inhalation and ingestion cleanup levels at 15,900 mg/kg. Gas range organics, volatile organics and polyaromatic hydrocarbons were also analyzed, but well below cleanup levels. Shawn Tisdell
12/16/2021 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78730 Overfill of 300-gallon UHOT from 1,000-gallon AHOT - Diesel #1. Shawn Tisdell
1/20/2022 Workplan Requested Project manager requested revised vapor intrusion sampling and analysis plan for mobile home nearest the release source. Shawn Tisdell
3/31/2022 Document, Report, or Work plan Review - other Sent letter and comments to RP following review of 2/2022 vapor intrusion sampling work plan. Proposed sampling scope was to sample air during one or more events in crawlspace of mobile home directly above soil likely impacted by the heating oil release. Additional sampling of the crawlspace or of indoor air would depend on initial sampling results and field observations. Shawn Tisdell
5/17/2022 Site Characterization Workplan Approved The May 2022 Sampling and Analysis Plan (SAP) V1.1 for sampling VOCs in the crawlspace of the trailer home has been approved. Sampling time has been updated from the summer of 2022 to the summer/fall of 2023. Shawn Tisdell
6/6/2023 Site Visit Project manager visited the site with consultant from 3-Tier Alaska to meet with trailer owner and the landowner. Contact was made with a neighbor and trailer occupant. Additional communication with the landowner and trailer owner will be necessary before a sampling event can be conducted. Shawn Tisdell
6/23/2023 Update or Other Action DEC Letter sent to the family of the former landowner requesting updated contact information. Shawn Tisdell

Contaminant Information

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
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