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 |
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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 |