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Site Report: Four Seasons Mobile Home Park

Site Name: Four Seasons Mobile Home Park
Address: 5901 East 6th Avenue; ~54.6 Acres, Anchorage, AK 99504
File Number: 2100.38.534
Hazard ID: 25921
Status: Active
Staff: Lisa Krebs-Barsis, 9072697691 lisa.krebs-barsis@alaska.gov
Latitude: 61.218752
Longitude: -149.767074
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

In September 2012, petroleum-contaminated soil was reported at the Four Seasons Mobile Home Park. Contamination included multiple releases from underground fuel distribution piping that was fed by a single above ground storage tank. Additional contamination in the form of soil staining from vehicle maintenance activities was excavated and transported off site for thermal treatment.

Action Information

Action Date Action Description DEC Staff
9/12/2012 Offsite Soil or Groundwater Disposal Approved Approved transport and thermal treatment and post-treatment sampling for GRO, DRO, RRO and BTEX of ~20 tons of soil from motor oil stains from parking spaces. Consultant identified nine soil stains larger than 9 sq. ft. in area and sampled for DRO, RRO and BTEX. ASR acknowledged receipt of 20 tons and advised ADEC of comingling under facility bond in a letter dated Sept. 25, 2012. Eileen Olson
9/28/2012 Site Visit Contaminated Sites staff visited the site to observe several hundred feet of exposed buried fuel line, including observable releases at two areas along the pipeline. The fuel line observed by staff had an outside diameter of approximately 1.25 inches. Investigation of the thousands of feet of piping at the park is ongoing, with the pipeline buried less than one foot below the ground in most areas. Katrina Chambon
10/5/2012 Offsite Soil or Groundwater Disposal Approved Approval to transport diesel range organic (DRO) and residual range organic contaminated soil to ASR based on results dated Sept. 28, 2012. See October 3, 2012 letter from TERRASAT "Re: Four Seasons Mobile Home Park, Release notification and request to directly haul contaminated soil to Alaska Soil Recycling." Katrina Chambon
10/9/2012 Site Added to Database A new site has been added to the database Mitzi Read
10/9/2012 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79340 name: AST and Fuel Distribution System Mitzi Read
10/10/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79340 AST and Fuel Distribution System. Katrina Chambon
4/8/2013 Meeting or Teleconference Held Meeting with consultant regarding work that has been completed and work that will occur in spring/summer. Katrina Chambon
4/10/2013 Potentially Responsible Party/State Interest Letter Katrina Chambon
5/6/2013 Site Characterization Report Approved ADEC letter - partial review of two reports, the "Characterization and Remediation Investigation at Four Seasons Mobile Home Park" dated April 3, 2013 and review of the "Characterization and Remediation Investigation at Four Seasons Mobile Home Park-Oil Stains on Lots" dated March 30, 2013 and received by ADEC on April 8, 2013. The first report presents the sampling results from the soil sampling associated with the six abandoned heating oil distribution lines designated 1 – 6, north-south supply line on eastern edge of site and soil associated with feed pipe from the former aboveground storage tank (AST). The lines are buried up to three feet below ground surface (bgs). The second report presents the remediation and sampling result from the surface soil stains associated with individual mobile home lots. The reports requested a site closure for a) Lines 1 thru 5 except in the “contaminated location” areas and b) for the surface soil stains. The Department denies your full requests for site closure on these issues as discussed further below, but does agree in part (see Summary section below). The surface soils (down to 6 feet) at Line 2 and Line 3 and for the surface soil stains located on the site have been characterized; however, it is still possible that a smear zone exists along these lines and/or groundwater contamination is a potential complete pathway. The CSP may require further action regarding groundwater and subsurface soil contamination. The CSP still considers Line 1, Line 4, Line 5, Line 6 and the Line running North-South on the eastern edge of the site as contaminated. We understand that your consultant is continuing to work in these areas and we expect a report on cleanup activities in these areas. CSP concurs with your consultant that Line 2 and Line 3 and the removed surface soil stains pose no risk to human health or the environment and concurs that the surface soil down to 6 feet bgs along Lines 2 and 3 where the pipes were removed has been characterized. CSP is requiring no further remedial action along Line 2 and Line 3 where the pipe was removed. If DEC finds evidence to suspect that groundwater is contaminated in the area, DEC may require monitoring wells to be installed within the existing roads or adjacent to the existing roads. The CSP still considers: Line 1; Line 4; Line 5, Line 6; and the Line running North-South on the eastern edge of the site; and soil associated with feed pipe from the former AST as contaminated. CSP strongly suggests that groundwater depth be determined in order to evaluate if vapor intrusion will be a potential pathway. Groundwater depth can be determined by digging a test pit or drilling a borehole. Katrina Chambon
5/9/2013 Site Characterization Workplan Approved The work plan proposes to characterize and remediate the remaining known contaminated soil at the Four Seasons Mobile Home Park, associated with an abandoned heating oil distribution system. The remaining contamination exists on Lines 1, 4, and 5 and at the east pit, east of Line 3 in the unnamed road. Line 6 and the remaining supply line, running north-south, on the east of the property between Lines 4 and 6 will be investigated during May 2013. This work plan is approved with the following conditions: 1. Complete copies of field notes must be provided with the report. Please note that CSP requires a hard copy of the final report. Please do not submit the final report only electronically or in CD format; however, laboratory data will be accepted on a CD, if the report is more than 200 pages. Hard copies shall be delivered or mailed to the DEC office. 2. Please provide three (3) working days advance notice when planning to do work, to give us an opportunity to be on site to inspect. Katrina Chambon
5/21/2013 Offsite Soil or Groundwater Disposal Approved Approval granted to transport approximately 340 cy of DRO contaminated soil; post-treatment analysis for GRO, DRO, RRO , BTEX. Katrina Chambon
6/11/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79340 AST and Fuel Distribution System. Katrina Chambon
6/14/2013 Site Characterization Report Approved The Alaska Department of Environmental Conservation’s (ADEC) contaminated sites program has completed its review of the Request for Line 1 Closure-Four Seasons Mobile Home Park dated June 3, 2013. Based on the analytical results of confirmation soil samples collected following the various removal actions, ADEC will require no further action at Line 1. Please note that Line 4, Line 5, Line 6, the Line running North-South on the eastern edge of the site; and soil the associated with the feed pipe at the former AST will require further action to delineate the nature and extent of contamination in these areas. If any of these source areas are suspected to have impacted groundwater, additional investigation may be required. Katrina Chambon
6/14/2013 Site Visit Site visit to observe contaminated soil removal from former AST location. Katrina Chambon
6/20/2013 Site Visit Site visit to observe soil excavation. Katrina Chambon
6/28/2013 Site Visit Site visit to observe groundwater contamination along old home heating fuel line. Katrina Chambon
7/2/2013 Site Characterization Workplan Approved Work plan approved to install four boreholes and complete two boreholes as groundwater monitoring wells. Katrina Chambon
7/3/2013 Site Visit Site visit to observe soil sampling and groundwater monitoring well installation. Katrina Chambon
7/19/2013 Offsite Soil or Groundwater Disposal Approved Approved transport of an estimated 12 cubic yards of soil contaminated by 1,2,4-Trimethylbenzene to Alaska Soil Recycling (ASR) for thermal treatment; request form dated 7/18/2014 by consultant. Surface stain is source. Katrina Chambon
7/23/2013 Site Characterization Workplan Approved The work plan proposes to complete five boreholes and complete them as groundwater monitoring wells. This work plan is approved. Katrina Chambon
8/5/2013 Site Characterization Workplan Approved Work plan proposes to remove approximately 20-40 cubic yards of contaminated soil from the release at the 4LN-01 pipeline distribution tree location. Katrina Chambon
4/28/2014 Meeting or Teleconference Held Staff met with consultant's representatives to go over final report findings; received copy of final report requesting site closure. Eileen Olson
4/30/2014 Update or Other Action ADEC received "Addendum to Report: Site Characterization and Remediation of the Four Seasons Mobile Home Park" dated April 29, 2014. The addendum includes information requested during 4/28/2014 meeting including diagrams showing field screening (PID) and confirmation sampling locations. Eileen Olson
5/1/2014 Update or Other Action ADEC received "Phase I Environmental Site Assessment for Four Seasons Mobile Home Park" from consultant dated June 25, 2012 as requested by email on April 30, 2014. Eileen Olson
5/14/2014 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79340 AST and Fuel Distribution System. Eileen Olson
5/15/2014 Cleanup Complete Determination Issued Cleanup complete determination issued based on file review including final report dated March 26, 2014. Eileen Olson
8/29/2014 Document, Report, or Work plan Review - other ADEC approved the revised "Work Plan for Four Seasons Mobile Home Park - Fleetwood Ave" dated August 25, 2014 and received August 26, 2014. The plan revises the plan with the same title dated August 20, 2014, with revisions made in response to ADEC review comments. Eileen Olson
9/3/2014 Offsite Soil or Groundwater Disposal Approved Approved transport of an estimated 160 tons of soil to Alaska Soil Recycling (ASR); request form dated 7/18/2014 by consultant. Spill location described as 'Intersection of Fleetwood Ave and the unnamed road at the east end of Four Seasons Mobile Home Park." Eileen Olson
9/16/2014 Site Reopened ADEC letter issued notifying owner that site was reopened on this date based on the presence of soil and groundwater contamination encountered during utility excavation work in mid-July 2014. Eileen Olson
10/1/2014 Document, Report, or Work plan Review - other ADEC reviewed stockpile field screening and analytical results confirming that three stockpiles at the site were clean. The soil had been segregated after field observations indicated it was not impacted. ADEC's email of this date noted ADEC's non-objection to the reuse of the soil for backfill. Eileen Olson
10/2/2014 Document, Report, or Work plan Review - other ADEC reviewed and approved a modification dated October 2, 2014 to the approved work plan dated September 25, 2014. The modification proposes excavation dewatering into the AWWU sanitary sewer subject to approval of the AWWU permit application. The previous plan did not propose dewatering. Eileen Olson
12/29/2014 Update or Other Action Acknowledged notification from Alaska Soil Recycling that total tonnage of petroleum impacted soil received in 2014 from site was 3,691.22 tons. Eileen Olson
2/5/2015 Document, Report, or Work plan Review - other ADEC letter of non-objection to continue construction at property issued in response to 1/28/2015 submittal by consultant requesting same for areas that have been characterized and cleaned up. Eileen Olson
3/16/2015 Document, Report, or Work plan Review - other ADEC letter granting conditional approval of "Monitoring Well Installation Work Plan" dated March 12, 2015 Eileen Olson
7/10/2015 Document, Report, or Work plan Review - other ADEC approved a dewatering plan dated July 7, 2015. The plan proposes dewatering from several well points along the eastern side of the mobile home park property, with intermittent pumping over an eight week period and disposal of water into the sanitary sewer. (Sanitary sewer disposal will require a permit from Anchorage Water and Wastewater Utility (AWWU)). The objective of dewatering is to remove contaminated water and to mobilize and remove mobile components of contamination from soil. Eileen Olson
1/6/2017 Meeting or Teleconference Held Staff met with consultant to discuss report received concurrent with meeting "Four Seasons May and August 2016 Monitoring Well Sampling Results for Four Seasons Mobile Home Park" dated September 28, 2016, and to discuss closure requirements. Eileen Olson
1/11/2017 Meeting or Teleconference Held Meeting with consultant to discuss property boundary soil and groundwater conditions. Groundwater in 4 remaining wells to be sampled 1/13/2017. RP would like closure of part of site. Eileen Olson
4/7/2017 Update or Other Action ADEC received "January 2017 Monitoring Well Sampling Results" report. Conclusions of the report include: DRO, RRO VICs and PAHs remain below ADEC groundwater cleanup levels in the four monitoring wells; request to cease groundwater monitoring and decommission monitoring wells FS-MW-01, FS-MW-02, FS-MW-03, and FS-MW-04, well points WP-1, WP-2, WP-5, and WP-6, and piezometers PZ-1, PZ-2, and PZ-3; and purge water from FS-MW-2 be filtered through a GAC and disposed of on the land surface, as the laboratory results show it is below cleanup levels. Eileen Olson
9/8/2017 Update or Other Action ADEC received "Request to Decommission Monitoring Wells and Piezometers at Four Season Mobile Home Park" which included an authorization request to cease groundwater monitoring and decommission monitoring wells FS-MW-01, FS-MW-02, FS-MW-03, and FS-MW-04, well points WP-1, WP-2, WP-5, and WP-6, and piezometers PZ-1, PZ-2, and PZ-3. Eileen Olson
9/11/2017 Document, Report, or Work plan Review - other ADEC approved the "Request to Decommission Monitoring Wells and Piezometers at the Four Season Mobile Home Park". Eileen Olson
6/14/2019 Document, Report, or Work plan Review - other ADEC provides comment on the document titled "Four Seasons Mobile Home Park Supplemental Site Investigation Work Plan" dated May 2019. This work plan proposes soil and groundwater characterization at off-property locations to the east. Kara Kusche
7/10/2019 Site Characterization Workplan Approved ADEC approves the "Four Seasons Mobile Home Park Supplemental Site Investigation Work Plan" dated July 2019. Kara Kusche
8/5/2021 Update or Other Action Received update from consultant. Supplemental site activities completed in 2/2021 and those soil and groundwater samples were all below CULs. Due to refusal at some locations, an additional boring location is proposed. ADEC approves what was presented in email. Kara Kusche
3/16/2023 Site Characterization Report Approved 2021 Supplemental Investigation Report approve. Additional soil borings (13) and temporary wells (3) were installed at properties east of the trailer park at 330 and 340 Peppertree Loop. Samples were analyzed for GRO, DRO, RRO, VOC, and PAH. Groundwater was sampled twice, in February and in October 2021. There were detections in the soil borings and the temporary wells. Except for one soil boring (SB09) all detections in soil and groundwater were below the most stringent cleanup levels. One soil boring SB09 at the back of 330 Peppertree near the property boundary had detections of naphthalene in excess of the most stringent cleanup levels at 13.5 and 17 feet bgs. Lisa Krebs-Barsis

Contaminant Information

Name Level Description Media Comments
Benzene < Method 2 Most Stringent Soil
GRO < Method 2 Most Stringent Soil
Naphthalene < Method 2 Most Stringent Soil
Toluene < Method 2 Most Stringent Soil
Xylenes (total) < Method 2 Most Stringent Soil
Ethylbenzene < Method 2 Most Stringent Soil
DRO < Method 2 Most Stringent Soil
1,2,4-Trimethylbenzene < Method 2 Most Stringent Soil
DRO < Table C Groundwater

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.

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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
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