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Site Report: Residence - 629 Tazlina Terrace

Site Name: Residence - 629 Tazlina Terrace
Address: 629 Tazlina Terrace, Copperville, Alaska, Copperville is an unincorporated community in the Glennallen area . , Glennallen, AK 99588
File Number: 240.38.015
Hazard ID: 25920
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 62.064844
Longitude: -145.410740
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

Heating oil releases from two unregulated tanks was reported to ADEC's Contaminated Sites Program in August 2012. During site investigation work in August 2012 petroleum-contaminated soil from the two tanks, a 500-gallon aboveground storage tank (AST) and a 1,200-gallon underground storage tank (UST) was to some extent comingled, but the AST release was determined to have been cleaned up to applicable 18 AAC 75 Method Two cleanup levels. Contamination at the UST location was associated with a damaged fill pipe; each time the tank was filled, heating oil was released into the underlying soil. Accessibility is a problem with respect to the UST because a garage with a slab-on-grade was constructed over the UST, with the fill end of the UST located just below the foundation along a wall of the garage and the fill pipe angled out from the wall to allow the tank to be filled. The garage is attached to the home. During the 2012 work the UST was decommissioned in place and later replaced by an AST. Accessible petroleum-contaminated soil from the UST was excavated to 17 feet below the ground surface (bgs). Groundwater investigation and long-term monitoring were completed in late 2016, and the site was closed following decommissioning of the three monitoring wells and piezometer on the property in May 2017.

Action Information

Action Date Action Description DEC Staff
8/14/2012 Offsite Soil or Groundwater Disposal Approved On August 13, 2012 ADEC was notified of releases associated with two heating oil aboveground storage tanks (ASTs) and a heating oil underground storage tank (UST) beneath the garage slab at this residential property. At the time the releases were reported the consultant requested and on 8/14/2012 ADEC approved transport of contaminated soil to Anchorage for thermal remediation. Eileen Olson
8/20/2012 Update or Other Action Alaska Soil Recycling (ASR) letter dated 8/20/2012 states that ASR received 14.89 tons of petroleum impacted soil from the site on 8/14/2012 and in accordance with ASR's approved facility operations plan, no further remedial action is required by the responsible party for the soil. Eileen Olson
9/28/2012 Update or Other Action Alaska Soil Recycling (ASR) letter dated 9/28/2012 states that ASR received 203.55 tons of petroleum impacted soil from the site on September 11 and 12, 2012 and in accordance with ASR's approved facility operations plan, no further remedial action is required by the responsible party for the soil. Eileen Olson
10/8/2012 Site Added to Database A new site has been added to the database Mitzi Read
10/8/2012 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79339 name: 2 Heating Oil Tanks - 1,000-Gal UST and 500-Gal AST Mitzi Read
1/14/2014 Potentially Responsible Party/State Interest Letter Bill Janes
3/13/2014 Document, Report, or Work plan Review - other Review letter issued this date for report "Characterization and Remediation Investigation at 629 Tazlina Terrace" dated February 19, 2014 and prepared by TERRASAT. The report documents the summer 2012 excavation and transport for thermal treatment of ~218 tons of petroleum hydrocarbon contaminated soil. Contaminant sources included a 500- gallon aboveground storage tank (AST), a 290-gallon AST, and a 1,000-gallon underground storage tank (UST), all used for heating oil storage. A total of 8 confirmation soil samples were collected from excavations beneath the AST locations. Confirmation samples from the limits of the AST excavations confirmed contaminated soil was removed. Five soil samples were collected from the UST excavation pit. Analytical soil samples confirmed that contaminated soil was removed north of the UST; however, soil contamination remains underneath the garage. ADEC requested that a work plan be submitted by May 31, 2014, including a work schedule, to include advancing boreholes to the east, south, and west of the underground storage tank. ADEC also requested that the extent of soil contamination remaining beneath the slab be delineated and the migration to groundwater pathway investigated, and a conceptual Site Model (CSM) submitted. Katrina Chambon
4/29/2014 Meeting or Teleconference Held Staff met with consultant to discuss findings reported in "Characterization and Remediation Investigation at 629 Tazlina Terrace, Glennallen, AK 99588" dated January 24, 2014. Consultant provided additional information regarding estimated concentrations and extent of remaining contamination. Eileen Olson
6/24/2014 Meeting or Teleconference Held Staff met with consultant to clarify past sampling locations and rationale for sample selection, and to discuss next steps in characterizing contamination including groundwater sampling. Received additional information including draft response to ADEC letter dated March 13, 2014. Eileen Olson
9/12/2014 Document, Report, or Work plan Review - other ADEC letter issued on 9/12/2015 conditionally approved "Work Plan and Groundwater Characterization for Delineation of Contaminated Soil at 629 Tazlina Terrace" dated 8/1/2015 and plan modification provided by email on August 20, 2014. The plan proposes installation of three push probes to investigate remaining soil contamination and determine whether the heating fuel release impacted the groundwater, reportedly present 20 feet or more below the ground surface. The plan modification entails adding one additional push probe, installed at a 45-degree angle, to provide a continuous core, with the objective of characterizing contamination remaining in shallow soil adjacent to and beneath the closed-in-place tank. The letter followed verbal limited approval of the plan granted on Sept. 5, 2014 to the extent that the consultant could plan for mobilization to the property. ADEC's letter noted concerns that the push probes may not be successful in terms of soil sample recovery, given the rocky soil type, or determining depth to groundwater, with the caveat that is the results of the investigation are inconclusive additional work will be required to determine whether groundwater has been impacted. Eileen Olson
4/15/2015 Meeting or Teleconference Held ADEC met with TERRASAT representatives to discuss next steps; received work plan during meeting. Eileen Olson
4/17/2015 Document, Report, or Work plan Review - other ADEC provided detailed preliminary comments and requests for additional information by email on 4/17/2015 following review of the work plan received during the 4/15/2015 meeting with the consultant. The plan proposes application of non-indigenous microbes and nutrients for in situ bioremediation beneath the garage floor slab. Eileen Olson
6/12/2015 Document, Report, or Work plan Review - other ADEC letter issued granting conditional approval for soil remediation work plan and work plan modifications. Conditions include testing monitoring wells for nitrates pre- and post-treatment of in situ soil with fertilizer. Eileen Olson
8/3/2015 Document, Report, or Work plan Review - other ADEC work plan approval letter dated 8/3/2015 for "Work Plan and Groundwater Characterization for Delineation of Contaminated Soil" dated July 27, 2015. The plan included a conceptual site model (CSM) and proposed investigating soil and groundwater by completing three borings as groundwater monitoring wells and installing a piezometer, with samples collected from specified intervals for diesel range organics (DRO) and benzene, toluene, ethylbenzene and total xylenes (BTEX) analysis. Eileen Olson
9/4/2015 Update or Other Action ADEC was notified by the former owner on this date that the lending institution that financed the home re-purchased it. The former owner provided ADEC with settlement documents stating that 1) the purchaser (lending institution) retains and reassumes any and all obligations and liabilities relating to or arising from existing residual contamination, with residual contamination defined as diesel fuel compounds present on the property on December 10, 2012;; and 2) the purchaser shall indemnify, defend and hold the former owner harmless from all such obligations and liabilities. Eileen Olson
11/5/2015 Document, Report, or Work plan Review - other ADEC's letter dated 11/5/2015 reviewed the "Report of 2015 Soil and Groundwater Investigation at 629 Tazlina Terrace, Copperville, Alaska, October 5, 2015" and the "Addendum to: Report of 2015 Soil and Groundwater Investigation, October 28, 2015". Based on the review ADEC requested that the responsible party submit a plan for additional site characterization that includes sampling and measuring the vertical elevation of the existing monitoring wells and installing an additional well downgradient of the contaminant source. Eileen Olson
1/12/2016 Document, Report, or Work plan Review - other ADEC letter dated 1/12/2016 responds to a letter dated 11/16/2016 from the responsible party's counsel that had the subject line "Renewed Request for Conditional Site Closure". ADEC's letter provides an explanation for the requested additional work and reiterated most of the requirements of the previous letter of 11/5/2015 with the exception of the installation of an additional monitoring well. ADEC noted that although field observations at the time the wells were installed warranted placing a monitoring well downgradient from the former UST location, installation of the additional boring completed as a monitoring well is not requested at this time and the need for an additional boring and/or well will be evaluated following review of additional groundwater monitoring results. Eileen Olson
2/8/2016 Document, Report, or Work plan Review - other ADEC letter dated 2/8/2016 conditionally approves the "2016 Groundwater Monitoring Plan for 629 Tazlina Terrace" dated 2/4/2016. Conditions include using a bladder pump or positive pressure submersible pump instead of a bailer for groundwater sampling, etc. ADEC has requested a minimum of four quarterly monitoring events including the first event in August 2015. Eileen Olson
6/20/2016 Update or Other Action ADEC received GW monitoring results and field notes for groundwater sampling done on May 24, 2016. DRO, GRO and BTEX samples were collected from each of the three monitoring wells. There were some BTEX detections but all results were below cleanup levels by an order of magnitude or more. Eileen Olson
9/15/2016 Update or Other Action ADEC received GW monitoring results and field notes for groundwater sampling done on August 23, 2016. DRO, GRO and BTEX samples were collected from each of the three monitoring wells. No results exceeded cleanup levels. Eileen Olson
5/24/2017 Document, Report, or Work plan Review - other ADEC received and reviewed the report on decommissioning the monitoring wells and piezometer on the property, done on May 19, 2017. Eileen Olson
5/24/2017 Cleanup Complete Determination Issued Cleanup Complete status was granted this date. Eileen Olson

Contaminant Information

Name Level Description Media Comments
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
GRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Xylenes (total) Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

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.

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
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