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Site Report: ADOTPF Chulitna Maintenance


Site Name: ADOTPF Chulitna Maintenance
Address: Mile 121 of the Parks Hwy, Trapper Creek, AK 99683
File Number: 2269.26.002
Hazard ID: 23604
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 62.404930
Longitude: -150.260662
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 1997, the Alaska Department of Transportation and Public Facilities (ADOT&PF) removed three underground storage tanks (USTs) and a concrete dispenser island. The tanks included one 3,000 gallon gasoline tank, one 3,000 gallon diesel tank, and one 2,000 gallon diesel tank from the site. Soil contamination was observed during the UST removals. The extent of the contamination was not fully delineated. Up to 520 mg/kg GRO and 10,000 mg/kg DRO in excavation confirmation samples. Facility water well within 100 feet of remaining contamination, consultant matrix scored the groundwater depth at 26 to 50 ft bgs but without backup.

Action Information

Action Date Action Description DEC Staff
8/1/1997 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 78049 * Not Assigned
8/1/1997 Leaking Underground Storage Tank Cleanup Initiated - Petroleum * Not Assigned
8/1/1997 Site Added to Database * Not Assigned
10/21/1999 Update or Other Action Repeat request for additional information. * Not Assigned
1/28/2004 Update or Other Action Transferred DEC staff lead from John Carnahan Cynthia Pring-Ham
12/29/2006 Update or Other Action Staff transferred from Pikul to DeRuyter Aggie Blandford
7/29/2008 Update or Other Action Email communication with ADOT&PF which indicates that water use is not intended for drinking water and bottle water is supplied. Letter sent requesting that water taps have signage posted indicating that water is not potable and that water be sampled for GRO and DRO so that impact to groundwater can be evaluated. Keather McLoone
8/6/2008 Update or Other Action ADOT email acknowledges receipt of letter and states that signage will be posted but that ADOT can not fund for sampling. Keather McLoone
9/12/2008 Update or Other Action Date of letter to ADOT&PF regarding results of analysis of water from onsite well collected by ADOT staff on 8/20/08 (0.0104 mg/L GRO and 0.143 mg/L DRO both estimated because below PQL). Results and lab data review checklist were included in the mailing. Keather McLoone
2/11/2009 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78049 former USTs. Keather McLoone
6/2/2010 Site Visit Site visit was conducted in order to confirm well location in relation to former USTs as well as current water use at station in anticipation of preparing an RFP for term contract work. One individual working at the station is drinking the water and hauling it to his home for use there as he doesn't have his own well. Followup meeting with supervisor suggests that we may be able to collect another, different water sample from the onsite well and then draft a decision letter for this site. Contacted Kevin Mielke, Central Region Facilities Manager and asked for well construction details which will also inform any future decision regarding this site. Keather McLoone
10/6/2010 Site Visit Site visit was conducted to collect water sample from onsite well. Keather McLoone
10/19/2010 Update or Other Action Date data for onsite well sample received via email from laboratory. Although there was a data quality issue (lab supplied unpreserved containers for DRO and sample was preserved with acid upon receipt), the results indicate that the well water is not being impacted. DRO was ND at 0.8 mg/L, GRO was reported as estimated at 0.0482 mg/L, and VOCs were nondetect except chloromethane which was 0.62 ug/L - all below Table C values. Keather McLoone
1/5/2011 Cleanup Complete Determination Issued Contaminated Sites staff has completed a review of the environmental records associated with ADOTPF Chulitna Maintenance located at Mile 121 Parks Highway near Trapper Creek, Alaska. Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and no further remedial action will be required as long as the site is in compliance with established institutional controls (ICs). Keather McLoone
1/5/2011 Institutional Control Record Established Institutional Controls established and entered into the database. Keather McLoone
1/7/2011 Update or Other Action Phone call received from ADOT staff requesting clarification of decision letter. During this conversation, it was indicated that the stockpile of soil removed from the former UST excavation remains at the location across the highway from the site and is located in a pit. DEC staff signing the decision letter do not believe this changes the risk evaluation and documentation in the database and email in the file suffice to acknowledge the existence of stockpile remaining. Keather McLoone
12/15/2011 Institutional Control Compliance Review IC review conducted and staff named changed to IC Unit. Evonne Reese
5/27/2014 Institutional Control Update An IC reminder letter was issued to the responsible party on this date. Kristin Brown

Contaminant Information

Name Level Description Media Comments
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

Control Type

Type Details
Signed CS Determination

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.
Groundwater Use Restrictions 2. Installation of groundwater wells will require approval from ADEC. and 6. ADOT should post and maintain signage at each water tap directing staff and visitors to use bottled water for drinking water.
When Contaminated Soil is Accessible, Remediation Should Occur
Periodic Review Contact RP every three years to verify that site conditions have not changed. Re-evaluate the need for ongoing ICs after each contact.

Missing Location Data

Because the GIS location data for this site has not been entered, we cannot direct you to its position on the map. Click "Continue" to proceed to the Contaminated Sites Web Map or "Close" to return to the site report.
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