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Site Report: ADOT&PF Tazlina Maintenance Station

Site Name: ADOT&PF Tazlina Maintenance Station
Address: Mi 110 Richardson Hwy, Glennallen, AK 99588
File Number: 2260.26.001
Hazard ID: 24628
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 62.044224
Longitude: -145.425749
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

1993 Dames & Moore remove one 8,000 gallon diesel UST and one 8,000 gallon gasoline UST from the Tazlina Maintenance Station. Approximately 2,000 cubic yards of contaminated soil were removed from a single excavation, which extended to a depth of 25 feet below the diesel UST and 32 feet below the gasoline UST. Samples at the base of the excavation contained benzene at 40 to 120 mg/kg; DRO form 63 to 960 mg/kg; and GRO from 3,100 to 7,500 mg/kg. Another 2,000 gallon used oil UST was removed in 1997; approximately 10 cubic yards of contaminated soil was stockpiled on site. Benzene levels at the base of the excavation measured 0.047mg/kg. The onsite drinking water well does not contain benzene, toluene, ethylbenzene, or xylenes (BTEX) above the laboratory practical quantition limits. The nearest surface water is 1/4 mile away. The stockpiled soil was used in a road construction project.

Action Information

Action Date Action Description DEC Staff
7/29/1993 Site Added to Database Former Staff
7/29/1993 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77137 LCAU; Former Staff
9/23/1993 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; Kim DeRuyter
12/8/1997 Underground Storage Tank Site Characterization or Assessment S&W contracted for multiple closures. Closure of one 2,000-gal used oil UST. Approximately 10-cubic yard of coil were stockpiled onsite. Former Staff
12/8/1997 Release Investigation About 10-cubic yards of soil stockpiled onsite awaiting futher processing. Former Staff
12/31/1997 Update or Other Action Dames and Moore provides additional detail on closures from 1993. Appears two tanks were removed consisting of one 8,000-gal diesel and one 8,000-gal gas tank were removed between 9/27 and 9/30, 1993, generating 1,500-cubic yards of contaminated soil. Former Staff
1/2/1998 Update or Other Action ADEC sends letter to ADOT&PF requesting additional effort to include site assessment for previous tank pulls in 1993, remediation plan for 1.500-cubic yards of contaminated soil from 1993 closure, and remediation plan for 10-cubic yard closure in 1997. Former Staff
1/28/2004 Update or Other Action Transferred DEC staff lead from John Carnahan Cynthia Pring-Ham
6/30/2004 Underground Storage Tank Site Characterization or Assessment work plan approved. Will sample area where 1993 stockpile was spread and sample drinking water well. Sharon Richmond
3/2/2005 Release Investigation Release Investigation received. Kim DeRuyter
12/6/2005 Conditional Closure Approved NFRAP letter approved. Contaminated soil remains beneath the former tanks. The area of highest contamination was in TP-1 between 35 and 38 feet below ground surface. This area contained DRO up to 1,180 mg/kg, benzene 7.21 mg/kg, toluene 51.8 mg/kg and ethyl benzene at 11.6 mg/kg. This residual contamination is over 100 feet above the water table, is underlain by clay and frozen silt soils, and is buried under 35 feet of clean soil. There is residual contamination remaining in the ground but its location does not pose a risk and it will naturally attenuate over time. Kim DeRuyter
12/6/2005 Institutional Control Record Established In accordance with 18 AAC 75.325(i), ADEC approval will be obtained prior to removal and/or disposal of soil or groundwater from this site to an offsite 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. In accordance with 18 AAC 75.380(d)1) ADEC reserves the right to require additional site assessment, monitoring, remediation, and/or other necessary actions at this facility should new information become available that suggests any contamination at this site may pose a threat to human health or safety, or the environment. ADEC will consider a Site Closure (and removal of institutional controls) only after the soil and/or groundwater achieves the established cleanup levels for the site. Kim DeRuyter
10/10/2014 Institutional Control Compliance Review IC compliance review conducted. An IC reminder letter to the responsible party will be issued. Evonne Reese
11/12/2014 Institutional Control Update An IC reminder letter was issued to the responsible party on this date. Kristin Thompson
6/18/2018 Institutional Control Compliance Review IC compliance review conducted. Closure/IC Details updated. Kristin Thompson
12/9/2019 Institutional Control Compliance Review An Institutional Controls reminder letter e-mailed to the landowner/responsible party on this date. Mossy Mead
7/20/2022 Institutional Control Compliance Review IC compliance review conducted after a site visit was performed by the IGAP coordinator for the Copper River Native Association. A site visit report and photos were provided to DEC and there were not any concerns found in regarding to the institutional controls. Evonne Reese
7/11/2024 Institutional Control Compliance Review IC compliance review completed on this date. An IC reminder letter was e-mailed to the landowner. The next review will be in five years’ time. Gaige Robinson

Contaminant Information

Name Level Description Media Comments
Toluene 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
Ethylbenzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP

Requirements

Description Details
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.
Advance approval required to transport soil or groundwater off-site. Standard condition.
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 five years.
Hazard ID Site Name File Number
26949 ADOT&PF Tazlina Maintenance Station Class V Injection Well 2260.38.002

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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