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Site Report: ADOT&PF O'Brien Creek, UL T-235-2A

Site Name: ADOT&PF O'Brien Creek, UL T-235-2A
Address: O'Brien Creek; Mile 113 Taylor HWY, Chitina, AK 99566
File Number: 200.26.004
Hazard ID: 22877
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 64.316828
Longitude: -141.418246
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

Four USTs were removed from this site between 1992 and 1998. The tanks were described as: Tank #1was a 3,000 gallon diesel tank, Tank #2 was a 3,000 gallon unleaded gasoline and Tank #3, was a 3,000 gallon diesel tank, and an unregistered 500 gallon used oil tank. Tank #2 had failed a tightness test, and a problem was suspected with the piping associated with Tank #1. Soil beneath Tank #2 contained DRO concentrations from 5,400 to 8,500 mg/kg. Approximately 135 cubic yards of contaminated soil were removed from the Tank #2 excavation and stockpiled on site. Soil samples collected at the base of the Tank #1 excavation contained 12,500 mg/kg DRO, and ethylbenzene up to 16.4 mg/kg; Approximately 20 cubic yards of contaminated soil was removed from this excavation and stockpiled onsite. Soil beneath Tank #3 contained less than 30 mg/kg DRO the samples were not analyzed for BTEX analytes. Soil beneath the used-oil tank did not contain GRO, DRO, RRO, Benzene, halogenated volatile organic compounds, PCBs or total BTEX above Method One or Method Two soil cleanup levles; However arsenic was detected up to 20.5 mg/kg

Action Information

Action Date Action Description DEC Staff
11/1/1990 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 75827 ADD; Former Staff
11/1/1990 Site Added to Database Former Staff
11/30/1992 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; Thomas reports Nortech removed 135 yards of contaminated soils during a tank pull. Soils are stockpiled and feasibility study underway to determine best treatment technology. Soils stockpiled to ADEC standards. Former Staff
12/17/1992 Underground Storage Tank Site Characterization or Assessment SA1R; Gibler rec'd SAs for this and diesel generator tank. Diesel tanks clean; piping trench not sampled. Tank 235-2A excavation has 8,500 GRPH, 3,170 total BTEX, and 100ppm benzene, plus 1,330 ppm DRPH. DRPH puts nearby 3,000 gal. UST 235-2A in question. No SA on this. Matrix score underestimated. RI & CAP requested of James Little. Former Staff
1/15/1993 Underground Storage Tank Site Characterization or Assessment SA1R; Gibler: Assertion that contamination in situ from gas only questioned. Matrix score based on 0-25 cu. yds. contaminated soil rejected; also fine grained soil classification. RI & CA will be required. Depth to GW is aboaut 85 ft. Well across 3rd Ave. from site is clean (80 ft. N. of site). Former Staff
2/8/1993 Update or Other Action NOR; Gibler: Failed TTT on Oct. 17, 1991 not accounted for to DEC. NORL sent by Gibler to Michael Tinker, Reginoal Envir. Coordinator for ADOT/PF on 2/8/93. Former Staff
2/23/1993 Update or Other Action RPL2; Peterson sent PRP-CS Database Notification Letter to RP requesting update and more environmental information concerning contaminated site. DOT/Clarke Milne will respond in month or two, but as of this complete date have rec'd no response! Former Staff
9/15/1993 Update or Other Action CAPR; Kalu gave verbal approval for further site assessment and soil remediation. Former Staff
10/11/1993 Underground Storage Tank Site Characterization or Assessment SA1R; Kalu - reviewed phase 1 site assessment. Former Staff
6/6/1994 Update or Other Action CORR; Wingerter sent letter informing RP of their financial liability under new ADEC cost recovery policy. State is authorized, under Section 9003(h) of the Resource Conservation and Recovery Act to take action on this LUST facility. Former Staff
2/20/2003 Underground Storage Tank Site Characterization or Assessment currently reviewing report Sharon Richmond
11/18/2004 Leaking Underground Storage Tank Corrective Action Underway Received corrective action report. Work include digging test pits at locations of former tanks- groundwater not encountered at 24.5. Approximately 680 CY of contaminated soil was excavated and placed in a new stockpile. Sharon Richmond
9/8/2005 Document, Report, or Work plan Review - other Stockpile sampling report received yesterday. 500 cubic yards of soil consolidated from previous UST removals was stockpile at the site in 2002. Laboratory analysis indicated that all 5 of the July 2005 soil stockpile samples were below ADEC migration to groundwater cleanup levels for DRO, GRO, and BETX analytes. ADEC approved landspreading of the stockpile in a non-environmentaly sensitive area. Kim DeRuyter
2/10/2006 Conditional Closure Approved Soil samples from the limits of the 2002 excavation (between 16 and 26 feet bgs) ranged up to 5,270 mg/kg GRO and 3,450 mg/kg DRO. Benzene was detected up to 22.1 mg/kg and toluene, ethylbenzene, and total xylenes ranged up to 319 mg/kg, 165 mg/kg, and 1,003 mg/kg respectively. Kim DeRuyter
2/10/2006 Institutional Control Record Established In accordance with 18 AAC 78.274(b), ADEC approval shall be obtained prior to removal and/or disposal of soil or groundwater from this site to an off site location. If excavation is planned for the area of the former USTs, a plan to address the contamination remaining there shall be submitted to ADEC for review and approval. ADEC must be notified prior to installation of drinking water wells or other groundwater extraction wells on or in the vicinity of this site. In accordance with 18 AAC 78.276(f)(2) ADEC may require additional site assessment, monitoring, remediation, and/or other necessary actions at this facility should new information become available that indicates contamination at this site may pose a threat to human health or the environment. Kim DeRuyter
9/14/2012 Update or Other Action Staff changed from Eileen Olson to IC Unit. Kristin Thompson
9/26/2012 Institutional Control Compliance Review IC review conducted and reminder system initialized. Evonne Reese
5/27/2014 Institutional Control Update An IC reminder letter was issued to the responsible party on this date. Kristin Thompson
6/20/2018 Institutional Control Compliance Review IC compliance review conducted. Closure/IC Details updated. Since this site has a groundwater use restriction, the periodic review frequency was reduced to every three years. ICs Verification letter issued. Reminder system set to follow-up in 2021. Kristin Thompson

Contaminant Information

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

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP

Requirements

Description Details
Groundwater Use Restrictions ADEC must be notified prior to installation of drinking water wells or other groundwater extraction wells on or in the vicinity of this site.
Advance approval required to transport soil or groundwater off-site. Standard condition.
When Contaminated Soil is Accessible, Remediation Should Occur If excavation is planned for the area of the former USTs, a plan to address the contamination remaining there shall be submitted to ADEC for review and approval.
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) Standard condition.
Periodic Review ADEC will conduct a review of site conditions every three years.

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