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Site Report: Residence - 11433 W Meadowood Drive HHOT

Site Name: Residence - 11433 W Meadowood Drive HHOT
Address: 11433 W Meadowood Drive, Off Big Lake Road, at 0.75 Mile, Houston, AK 99694
File Number: 2230.38.003
Hazard ID: 4420
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.566070
Longitude: -149.738280
Horizontal Datum:NAD83

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

Between February 11-15, 2007 a burglar stole a Toyo stove from the residence and ~175 gallons of #1 diesel fuel were subsequently released onto the floor, inside the home, from the aboveground home heating oil tank. Fuel subsequently leaked through the floor boards and vapor barrier onto the ground beneath the residence. A 60 foot deep drinking water well is present on site, approximately 42 feet from the source area. At the time, the Contractor estimated that soil is contaminated ~20' below ground surface. According to the contractor, soil horizons reflected in the well log are as follows: 0-7' = top soil; 7-19' = gravel sand; 19-41' = hard pan; 41-46' = gravel water; 46-60' = clay; 60' = groundwater. on 4/9/07 50 lbs of urea and 25 lbs of fertilizer was mixed with 10 drums of water and poured over the fuel spill area, then a 2 inch layer of peat was placed over the soil, which was covered with a reinforced poly vapor barrier. In April and May of 2007 1/2 inch vapor probes were driven and PID vapor reading were collected to try to estimate how deep the contamination extended. The deepest elevated readings were detected up to 18 feet deep near the door. By 5/10/07 a total of 11 pipes were hand driven with various diameters, depths, and screened intervals. An injection blower was attached to one pipe (#4) and the others were connected to a suction fan vented to the outside. This was operated in 2007 and 2008, mainly in the summer months. An updated induced draft venting system was connected to the 11 pipes in the spring of 2009. PID reading in 2007 were up to 71 ppm, 25 ppm in 2008, and 85 ppm in 2009. The consultant recommended in 2009 that the space between the crawlspace and living area be better sealed, that PID readings be collected every two weeks with the system adjusted based on the readings, additional living area ventilation should be conducted, and monitoring of the on property drinking water well be conducted for fuel taste and odors. There was no documentation that these recommendations were implemented. Based on the information provided up to 2017 it did not appear that any soil, groundwater, or air laboratory samples had been collected. Only PID readings collected, which was insufficient to achieve site closure. The site received a third party liability designation in 2017. ADEC assumed lead and conducted site characterization activities in 2018-2020 to evaluate any remaining possible soil, groundwater or drinking water contamination. Due to the location of the spill (within the building footprint) a vapor intrusion investigation was also completed.

Action Information

Action Date Action Description DEC Staff
5/22/2007 Spill Transferred from Prevention Preparedness and Response Program Site transferred by PERP staff Mark Sielaff. Spill No. 07239904503; Spill Date 2/14/07; Substance = Diesel #1; Quantity = ~175 gallons; CATS Case No. 07-0119-10. Mitzi Read
5/23/2007 Site Added to Database Site added to the database. Mitzi Read
5/24/2007 Exposure Tracking Model Ranking Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. Mitzi Read
8/25/2010 Meeting or Teleconference Held Talked with property owners consultant, he will provide copies of all reports regarding this site. He said they have installed a treatment system and it has been operated and monitored it since 2007. Robert Weimer
3/16/2011 Document, Report, or Work plan Review - other April 7, 2009 report from the home owner’s consultant. The report states that on 4/9/07 50 lbs of urea and 25 lbs of fertilizer was mixed with 10 drums of water and poured over the fuel spill area, then a 2 inch layer of peat was placed over the soil, which was covered with a reinforced poly vapor barrier. In April and May of 2007 1/2 inch vapor probes were driven and PID vapor reading were collected to try to estimate how deep the contamination extended. The deepest elevated readings were detected up to 18 feet deep near the door. By 5/10/07 a total of 11 pipes were hand driven with various diameters, depths, and screened intervals. An injection blower was attached to one pipe (#4) and the others were connected to a suction fan vented to the outside. This was operated in 2007 and 2008, mainly in the summer months. An updated induced draft venting system was connected to the 11 pipes in the spring of 2009. PID reading in 2007 were up to 71 ppm, 25 ppm in 2008, and 85 ppm in 2009. The consultant recommended in 2009 that the space between the crawlspace and living area be better sealed, that PID readings be collected every two weeks with the system adjusted based on the readings, additional living area ventilation should be conducted, and monitoring of the on property drinking water well be conducted for fuel taste and odors. There has been no documentation to date that these recommendations have been implemented. Robert Weimer
6/24/2015 Update or Other Action The consultant recommended in 2009 that the space between the crawlspace and living area be better sealed, that PID readings be collected every two weeks with the system adjusted based on the readings, additional living area ventilation should be conducted, and monitoring of the on property drinking water well be conducted for fuel taste and odors. There has been no documentation to date that these recommendations have been implemented. Robert Weimer
6/30/2016 Potentially Responsible Party/State Interest Letter Updated PRP letter sent to listed RP on this date. Lisa Griswold
6/30/2016 Update or Other Action Letter requesting Site Characterization by August 29, 2016, sent on this date. Lisa Griswold
8/4/2016 Update or Other Action Discussed site with RP today. She is going to forward all information she has on site. Returned PRP letter, and request for site characterization were re-processed and mailed today. Current request for site characterization be submitted by October 3, 2016, but could change based on information submitted by RP. Lisa Griswold
8/11/2016 Meeting or Teleconference Held Discussed findings with RP over the phone regarding review of all information submitted by the RP. New information included a 2011 report on water well sampling. GRO and BTEX were non-detect in the water well. Sampling did not cover Diesel Range Organics, PAHs or VOCs. All sampling done on air was screening done with a PID, and cannot be used for evaluating risk on the site, or for determining eligibility for site closure. Links on available information concerning contaminated sites, a quick reference guide on hiring an environmental consultant, cleanup process fact sheet, and the 2009 closure memorandum were emailed to the RP for reference. The work plan for site characterization is currently due on October 3, 2016. Lisa Griswold
9/28/2016 Update or Other Action Submittal date for a site characterization work plan extended to November 28, 2016 to allow for more research into hiring a consultant. Lisa Griswold
12/8/2016 Document, Report, or Work plan Review - other ADEC will refrain from reviewing the Site Characterization Work Plan received on December 7, 2016 due to RP's participation in HHOT pilot program. ADEC requests consultant provide missing information pertaining to the sampling protocol used to collect the two drinking water samples to evaluate data usability. Lisa Griswold
12/9/2016 Update or Other Action ADEC received email response from consultant stating that "standard drinking water protocol" was used, and lists procedures. Field notes or reference to the drinking water sampling protocols were not provided in reports given. Lisa Griswold
4/19/2017 Update or Other Action Landowner is not currently eligible for the ADEC HHOT Pilot Program. Lisa Griswold
6/5/2017 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 75406 #1 Diesel Aboveground HHOT. Lisa Griswold
8/4/2017 Cleanup Assumed by ADEC Site received CIP funds to assist in characterization. Lisa Griswold
10/11/2017 Update or Other Action NTP awarded to Environmental Contracting Solutions, Inc. Lisa Griswold
11/6/2017 Meeting or Teleconference Held Discussion with consultant regarding ADEC comments on work plan received on 10/31 conducted on this date. Lisa Griswold
11/8/2017 Meeting or Teleconference Held Meeting with consultant and Quality Assurance officer conducted on this date to discuss ADEC comments on the work plan received on 10/31 and vapor intrusion investigations. Lisa Griswold
11/9/2017 Document, Report, or Work plan Review - other ADEC finalized review of the draft work plan. Consultant was provided links to ADEC guidance documents, a comment matrix for completion, and provided contact information for ADEC's Procurement section and Technical Guidance section. Revised work plan and comment matrix are to be submitted by November 23, 2017. Lisa Griswold
11/21/2017 Document, Report, or Work plan Review - other Consultant granted a two week extension to complete revised work plan due to a technical issue. Revised work plan due on December 7, 2017. Lisa Griswold
12/15/2017 Document, Report, or Work plan Review - other Revised work plan was reviewed on this date. Consultant was provided additional comments. The second revised work plan (version 3) and comment matrix are to be submitted by December 29, 2017. Lisa Griswold
12/29/2017 Document, Report, or Work plan Review - other Consultant granted proposed one week extension to submit version 3 of work plan as it is not completed. Version 3 of work plan is due January 5, 2018. Lisa Griswold
2/15/2018 Update or Other Action Contract with consultant terminated on this date. Lisa Griswold
7/11/2018 Update or Other Action Notice to Proceed for state-lead site assessment work awarded to BGES on this date. Lisa Griswold
9/25/2018 Site Characterization Workplan Approved Work plan for site characterization activities approved on this date. Activities include drilling 3-4 borings depending on site conditions; installation of three groundwater monitoring wells with DEC approval; groundwater sampling; drinking water well sampling and a vapor intrusion investigation. Lisa Griswold
10/16/2018 Site Characterization Workplan Approved Modifications to the work plan previously approved on September 25, 2018 approved on this date via email due to ongoing site activities. The changes include: Indoor/Outdoor Air Samples:1)The indoor air sample and duplicate indoor air sample will be collected within the crawl space area of the building and within the breathing zone. 2)The outdoor air sample location will be flexible and will be collected upwind from the aboveground storage tank and within the breathing zone. The wind direction will be determined at the time of sample collection. Soil Gas Sample Locations: 1)One soil gas sample will be collected within the crawl space area of the building. 2)The second soil gas sample will be collected outside and north of the front door to the building.3)The third soil gas sample will be collected outside and south of the front door to the building.4)The duplicate soil gas sample will be collected outside the front door from the location most likely to be contaminated. Lisa Griswold
3/12/2019 Update or Other Action Field work at the site is tentatively scheduled for the week of March 25, 2019. Lisa Griswold
4/15/2019 Update or Other Action Field work is tentatively scheduled for April 24-26, 2019. Lisa Griswold
12/22/2020 Document, Report, or Work plan Review - other Revised Site Characterization Report reviewed on this date. The report covers the activities listed in NTP19000020 including soil sampling, drinking water sampling, groundwater sampling, indoor air sampling, and soil gas sampling. Results indicate that Naphthalene is present in subsurface soil at 0.41 mg/kg, above ADEC Migration to Groundwater Cleanup Levels (0.038 mg/kg), but not above human health levels (29.0 mg/kg). A deeper sample was non-detect for Naphthalene, and Naphthalene was not found in the groundwater. Naphthalene was detected in indoor air above ADEC target levels in May 2019 in a duplicate sample (o.880 ug/m3). The other sample was below the target level of 0.830 ug/m3 (0.760 ug/m3). Additionally, this exceedance was after a small spill occurred inside the home while changing the filter on the Toyo stove in October 2018. Indoor air samples taken in February 2020 (when conditions should worsen vapor intrusion) did not find Naphthalene present above ADEC target levels in indoor air. Benzene was detected in soil gas in February 2020 (up to 400 ug/m3), but not May 2019. As benzene was not detected in indoor air above ADEC target levels in February 2020, it is not believed that the presence of benzene exceeding target levels in soil gas is migrating into the home on site during winter conditions when vapor intrusion should be at a height. Comments on the report were submitted to the contractor who will decommission the remaining groundwater monitoring wells in Spring 2021 and submit a final report by May 31, 2021. Lisa Griswold
12/22/2020 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 75406 #1 Diesel Aboveground HHOT. Lisa Griswold
3/5/2021 Cleanup Complete Determination Issued Cleanup Complete Determination letter issued on this date. Lisa Griswold
11/23/2021 Site Characterization Report Approved ADEC reviewed the revised Site Characterization Report submitted on October 28, 2021. This report addressed all of the comments in ADEC's December 22, 2020 letter and contained information on the decommissioning of the wells on site. Lisa Griswold

Contaminant Information

Name Level Description Media Comments
Naphthalene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Detected at 14-16 ft bgs with clean soil below
Naphthalene Other Indoor Air Detection was shortly after a spill of diesel while cleaning the filter on the Toyo stove. Was not detected in second sampling event.

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.

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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
TDD: 800-770-8973
Physical Location: 410 Willoughby