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Site Report: ADOT&PF Homer Maintenance Shop (OWS)

Site Name: ADOT&PF Homer Maintenance Shop (OWS)
Address: 3450 Sterling Highway, Homer, AK 99603
File Number: 2314.26.003
Hazard ID: 23744
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 59.659300
Longitude: -151.642300
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

An estimated 700-750 gallons, from a 1,000 gallon used oil tank released from a faulty oil/water separator and from a tank overflow onto the floor drain and under the building and through the pipes that lead to a roadside ditch. Approximately 80 yards of soil removed and stored on site, and then transported to Alaska Pollution Control. Further site assessment and cleanup generated 400 cubic yards of contaminated soil that was thermally remediated to below the soil cleanup levels. Contamination remains under the slab and adjacent to the foundation, along with contaminated perched groundwater that will naturally attenuate over time. Updated 11-28-05 Alyce Hughey. Dianna Rigg 1st point of contact person then switched to: Bob Boyd ADOT Manager, then George Church ADOT. Formerly assigned to Fritz until 7/1/93. (MOA - Proposed but not funded under FY95 request ($106K), FY96 $106K). _______________________________________________________________________________ Added 2/11/2016 by Paul Horwath: THE FOLLOWING INFORMATION IS ENTERED IN THE EFFORT TO MINIMIZE FUTURE MISUNDERSTANDING DUE TO THE PRESENCE OF TWO ADJACENT LUST "SITES" LOCATED ON THIS ADOT&PF PROPERTY. A SEPARATE LUST "site", located immediately adjacent to the Homer Maintenance Shop (OWS) "site", was identified in 1998 during the closure/removal of two former regulated underground storage tanks (USTs). These former USTs consisted of one 4,000 gallon diesel tank and one 3,000 gallon gasoline tank. Releases from this LUST event are entered into this database under a SEPARATE "site" entry: Site Name ADOT&PF Homer Facility, Hazard ID 24664, and File Number 2314.26.002. Monitoring wells MW-6 thru MW-13 were installed during release investigation work associated with this second "site", and these MWs completely surround MW-1 thru MW-5, which were installed in May 1993, during investigation of the waste oil releases. Monitoring wells MW-6 thru MW-13 are installed into a deeper aquifer than the perched groundwater encountered in MW-1 thru MW-5. Groundwater in MW-6 thru MW-13 is typically encountered between 26 and 30 feet below ground level. GRO, DRO, benzene, toluene, ethylbenzene, xylenes, 1,2,4,-trimethylbenzene, and 1,2-dichloroethane have been detected in concentrations exceeding the ADEC groundwater cleanup levels in some of these MWs. MW-7 and MW-8 have had the highest contaminant concentrations, however contaminant levels exceeding ADEC groundwater cleanup levels have also been detected in MW-6 and MW-9 also.

Action Information

Action Date Action Description DEC Staff
8/18/1989 Site Added to Database Former Staff
8/18/1989 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77633 ADD; Waste oil contaminant. Former Staff
8/19/1989 Update or Other Action NOR; :Action Date changed DB conversion 1/11/11 Former Staff
8/19/1989 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; :LCAU Date changed DB conversion Former Staff
8/19/1989 Update or Other Action CAPR; :Action Date changed DB conversion 1/11/11 Former Staff
8/31/1990 Update or Other Action Billie Webb sent an approval letter for testing of the contaminated soils and the transport of soils to Alaska Pollution Control. Alyce Hughey
4/11/1991 Update or Other Action Letter sent to George Church, ADOT&PF by George Perkins requesting explanation of the excavation work done, testing of excavated area and soils, testing of soils prior to thermal remediation, and to make sure the remediation equipment reaches sufficient temperatures and the facility has a valid air quality permit. Alyce Hughey
2/12/1993 Update or Other Action Letter with review comments for the Used Oil Tank Investigation Report for the Undrground Storage Tank, Received October 13, 1992 was sent by Don Fritz. Alyce Hughey
2/24/1993 Update or Other Action MEET; ADOT requested a meeting to formulate potential corrective action options. ADEC met with ADOT and their consultant in an effort to assist ADOT in formulating a corrective action plan. Former Staff
10/13/1993 Leaking Underground Storage Tank Corrective Action Underway LCAR; RP submitted a corrective action report that discussed cleanup activities undertaken. ADEC issued comments and concerns, and requested additional corrective action. Former Staff
12/20/1993 Underground Storage Tank Site Characterization or Assessment SA1R; SA1R was conducted by ADEC staff for a release from an underground waste oil tank at this facility. Former Staff
12/21/1993 Release Investigation RELR; :Action Date changed DB conversion 1/11/11 Former Staff
1/4/1994 Update or Other Action CAPR; ADEC staff provided comments for proposal by ADOT to discharge contaminated water from holding tank at this facility. Former Staff
1/4/1994 Update or Other Action Letter of response from phone conversations regarding the disposal of contaminated water by emptying a temporary 2,000 gallon above ground holding tank was sent by Monica English. Alyce Hughey
5/16/1994 Site Visit FI; FI to determine location of surficial contamination, location and piping configuration of the shop floor drains, and the presence and location of the above ground holding tank. Former Staff
10/11/1994 Update or Other Action CAPR; Monica English provided comments on proposed CAPR for remediation of contaminated groundwater and soils resulting from an UST system at this facility, from a Proposed Corrective Action received February 22, 1994. Former Staff
4/19/1996 Release Investigation SA2A; Departmental staff reviewed a corrective action plan for release investigation of a former regulated UST system. Soils and GW have been impacted by petroleum hydrocarbons from a former waste oil tank. Excavated soils were put into a biocell for remediation. Former Staff
12/3/2002 Update or Other Action Acceptance letter from a Soil Remediation Final Report received November 13, 2002, was sent by Monica English. Alyce Hughey
6/9/2004 Update or Other Action File number assigned and entered into the Fileroom DB and LUST DB. Alyce Hughey
7/27/2005 Update or Other Action Reviewed and organized file. Soil and perched GW remains exceeding ADEC clenaup levels. Requested any additional information DOT may have on the site. Proposed management decision to DOT is: natural attenuation of soil under and adjacent to building; assessment & remediation if construction activities makes it accessible; annual GW monitoring until 2 consecutive events have all contaminant levels in all MWs below clenaup levels; maintain fencing as IC to restrict site access. Awaiting DOT response before issuing decision. Donald Seagren
7/29/2005 Conditional Closure Approved Remaining contamination is subsurface immediately adjacent to the foundation or beneath the concrete floor. Risk to human health & the environment is low. Addtional assessment and/or corrective action will be required if the soil becomes accessible. LTM to be established. Site fencing maintained as institutional control. Analytical data showing soil and GW contaminant levels are below cleanup levels would be required prior to modifying this conditional closure to "site closure without institutional controls". Donald Seagren
7/29/2005 Long Term Monitoring Established Long term groundwater quality monitoring requirement established. Paul Horwath
7/29/2005 Institutional Control Record Established Maintain a fence around the facility, and perform long term groundwater quality monitoring. Paul Horwath
11/28/2005 Update or Other Action Using Figures 1 and 2 from an Environmental Site Assessment and Corrective Action Plan Homer Maintenance Facility, from Shannon & Wilson, dated March 1996, in conjunction with TopoZone Pro and the KPB Parcel Lookup, entered the coordinates for this site. Metadata includes no Topo Basemap,TopoZone Pro Street Maps, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Alyce Hughey
8/27/2006 Document, Report, or Work plan Review - other Monitoring wells MW-3 thru MW-5 (installed in May, 1993) were sampled on April 27, 2006 by ADEC term contractor Shannon & Wilson. MW-3 thru MW-5 are installed in shallow perched groundwater encountered at a depth of ~3 feet below ground surface under. DRO (2.17 mg/L) and tetrachloroethene (0.009 mg/L) were detected in MW-5 at concentrations exceeding their ADEC groundwater cleanup levels. These contaminants are associated with the two historical oil/water separator and waste oil tank spills, which occurred in 1989, and then again in 1992. This "site" was entered into the ADEC contaminated sites database due to these two (2) waste oil releases, and is identified by the Site Name ADOT&PF Homer Maintenance Shop (OWS), Hazard ID 23744, and File #2314.26.003. THE FOLLOWING INFORMATION IS ENTERED IN THE EFFORT TO MINIMIZE FUTURE MISUNDERSTANDING DUE TO THE PRESENCE OF TWO ADJACENT LUST "SITES" LOCATED ON THIS ADOT&PF PROPERTY. A SEPARATE LUST "site", located immediately adjacent to the Homer Maintenance Shop (OWS) "site", was identified in 1998 during the closure/removal of two former regulated underground storage tanks (USTs). These former USTs consisted of one 4,000 gallon diesel tank and one 3,000 gallon gasoline tank. Releases from this LUST event are entered into this database under a SEPARATE "site" entry: Site Name ADOT&PF Homer Facility, Hazard ID 24664, and File Number 2314.26.002. Monitoring wells MW-6 thru MW-13 were installed during release investigation work associated with this second "site", and these MWs completely surround MW-1 thru MW-5, which were installed in May 1993, during investigation of the waste oil releases. Monitoring wells MW-6 thru MW-13 are installed into a deeper aquifer than the perched groundwater encountered in MW-1 thru MW-5. Groundwater in MW-6 thru MW-13 is typically encountered between 26 and 30 feet below ground level. GRO, DRO, benzene, toluene, ethylbenzene, xylenes, 1,2,4,-trimethylbenzene, and 1,2-dichloroethane have been detected in concentrations exceeding the ADEC groundwater cleanup levels in some of these MWs. MW-7 and MW-8 have had the highest contaminant concentrations, however contaminant levels exceeding ADEC groundwater cleanup levels have also been detected in MW-6 and MW-9 also. Paul Horwath
10/9/2006 Update or Other Action Prepared and issued a Request for Proposals for groundwater sampling which is to occur in the spring of 2007. ADEC Term Contractor Shannon & Wilson was selected to perform this work. Donald Seagren
2/14/2007 Exposure Tracking Model Ranking Former Staff
4/20/2007 Document, Report, or Work plan Review - other MW-4 and MW-5 were sampled again by ADEC term contractor Shannon & Wilson on April 20, 2007. DRO was detected on MW-5 at 1.35 mg/L. Tetrachloroethylene was detected on MW-4 at 0.001 mg/L, and in MW-5 at 0.009 mg/L. Paul Horwath
6/17/2008 Update or Other Action Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. Alyce Hughey
11/10/2014 Update or Other Action Staff changed from Paul Horwath to IC Unit. Kristin Thompson
2/5/2016 Institutional Control Compliance Review IC compliance review conducted. A hard file review is needed to see if groundwater monitoring has been performed since the 2005 Conditional Closure date. Once we have this information a request for information letter will be issued to ADOT. The reminder system has been set. Evonne Reese
2/11/2016 Document, Report, or Work plan Review - other Reviewed the project file and determined that the last groundwater sampling event on any of the four remaining groundwater monitoring wells (MW-1, MW-3, MW-4, and MW-5) was performed on April 20, 2007. MW-4 and MW-5 were the only two MWs sampled, and the only contaminant exceeding ADEC groundwater cleanup levels was only detected MW-5. Tetrachloroethylene was detected on MW-5 at a concentration of 0.009 mg/L. DRO was detected at a concentration less than the ADEC GW cleanup level in both MW-4 and MW-5. Paul Horwath
5/19/2016 Institutional Control Update After consultation with the former project manager it was decided that future groundwater monitoring requirements can be removed but that other institutional control conditions will remain. Schedule to send an IC reminder letter in the near future. Evonne Reese
5/19/2016 Institutional Control Update Now that the groundwater monitoring is complete, all groundwater monitoring wells remaining on-site need to be decommissioned. IC reminder letter issued to the landowner on this date. Reminder system set to follow-up in two years. Kristin Thompson

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

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP If contaminated soil becomes accessible additional assessment/remediation required

Requirements

Description Details
When Contaminated Soil is Accessible, Remediation Should Occur
Other Now that groundwater monitoring is complete, the remaining four wells should be decommissioned.
Hazard ID Site Name File Number
24664 ADOT&PF Homer Facility 2314.26.002
26545 ADOT&PF Homer Maintenance Station Class V Injection Well 2314.38.037
26727 ADOT&PF Homer Maintenance Station AST 2314.38.039

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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