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Site Report: ADOT&PF Delta Junction Maintenance Camp

Site Name: ADOT&PF Delta Junction Maintenance Camp
Address: MP 265.5 Richardson Highway; Corner of Alaska &; Richardson Hwy, & Richardson Hwy, Delta Junction, AK 99737
File Number: 120.26.002
Hazard ID: 22879
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 64.037200
Longitude: -145.734900
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

In 1991, Timmons noted several leaking barrels of RC-600 at the site and recommended that a berm be constructed around the barrels.(rpltr4) A 3,000 gallon heating oil UST (Tank #1) was removed from this site in 1992, 130 cubic yards of contaminated soil was removed and stockpiled on site. Contaminated soil exceeding ADEC cleanup levels remained beneath the building. In 1993 ground water samples from a perched aquifer contained BTEX analytes below cleanup levels. In 1998, three more USTs were removed; a 3000 gallon diesel UST (Tank #3); 2000 gallon and 3000 gallon gasoline USTs (Tank #2 and Tank #4). Dispensers were located directly above the tanks; tanks and associated piping was all observed to be in good condition. DRO (2,950 mg/kg) and benzene (0.088 mg/kg) contamination were detected at the bottom of the excavation.

Action Information

Action Date Action Description DEC Staff
5/17/1991 Site Visit FI; Timmons conducted a field inspection at the request of State DOT and found that product from the tank had been released from a deteriorated rubber fitting. Contamination appeared to be confined to a 6' wide x 12' long x 3' deep area. There was also evidence below the 3 foot level of a plume extending downward to the base of the excavation at the 12 foot level. In order to fully assess the amount of contaminated soil the removal of the building will be necessary. Timmons recommended that the soil be stockpile and bermed and that 2 composite samples be taken from the excavation area to ensure the area is below the limit of 200 ppm TPH and 1 sample from the stockpiled soils. Timmons also noted leaking barrels of RC-600 and advised that the area be bermed. Former Staff
5/21/1991 Site Added to Database Former Staff
5/21/1991 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 75829 ADD; LUST site. Former Staff
8/9/1991 Update or Other Action RAPR; Timmons requested that a site assessment and corrective action be performed at the site. 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 Leaking Underground Storage Tank Corrective Action Underway LCAR; KALU - REVIEWED CORRECTIVE ACTION PLAN FOR ABOVE SITE. PLAN SEEMS ADEQUATE. WILL FOLLOW UP WITH CONSULTANT LATER IN THE YEAR. 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
5/16/1996 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; Removed a 500-gallon AST and leaking underground piping system. Stock piles 135 cubic yards of diesel contaminated soil (4220 ppm). Site Assessment cmpleted by Nortech (452-5688). Cross reference file 120.38.003. Former Staff
3/22/1999 Underground Storage Tank Site Characterization or Assessment SA for the removal of 3 USTs (Nos. 3,4, and possibly 2). Contaminatino identified and some soil removed and stockpiled. Former Staff
1/28/2004 Update or Other Action Transferred DEC staff lead from John Carnahan Cynthia Pring-Ham
1/20/2005 Update or Other Action Update GIS using site maps from Shannon Wilson Feb. 2003 report and Topozone Pro. Kim DeRuyter
1/20/2005 Document, Report, or Work plan Review - other Shannon & Wilson Feb. 2002 report outlines results of soil, drinking water, and stockpile sampling at the site. The drinking water samples did not contained GRO, DRO, or BTEX above their PQLs. Soil borings were field screened to 25 feet, showing a decreasing trend in contamination with depth (2000 ppm at 15’ to 700 ppm at 25’); no analytical samples were submitted from the borings; because course gravel caused difficult drilling and insufficient sample was recovered. Soil samples were collected from the base of four test pits, and analyzed for GRO (up to 617 mg/kg), DRO (up to 249 mg/kg), and BTEX analytes, benzene (up to 0.179 mg/kg), toluene (up to 2.22 mg/kg), ethylbenzene (up to 6.15 mg/kg), and total xylenes (up to 112.3 mg/kg). Samples from the 1998 stockpile did not contain GRO, DRO, or BTEX in concentrations exceeding the ADEC migration to groundwater soil cleanup levels. The report recommends land spreading of the stockpiled soil in a non-environmentally sensitive area and requests a No Further Remedial Action Planned status for the USTs since the contamination has been removed to the extent practicable and groundwater does not appear to have been affected. Total Xylenes are above the Method 2 soil cleanup levels for inhalation, but this pathway is unlikely to be complete. Kim DeRuyter
3/29/2005 Institutional Control Record Established ADEC approval will 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 Tank #4, a plan to address the xylenes contamination should be developed. The on-site drinking water well will be sampled in the summer of 2005, and 2006; using Environmental Protection Agency (EPA) Method 524. Kim DeRuyter
3/29/2005 Conditional Closure Approved Soil contamination remains underneath the shop building, and utilidor, GRO 617 mg/kg, DRO 249 mg/kg, and total xylenes 112.3 mg/kg. Kim DeRuyter
9/12/2005 Document, Report, or Work plan Review - other Results of August, 2005 Well Water Sampling, none of the analytes tested in the sample and field duplicate were detected in excess of their practical quantitation limit. Kim DeRuyter
12/20/2011 Update or Other Action Site management staff changed to IC Unit. Evonne Reese
12/20/2011 Institutional Control Compliance Review IC review conducted, follow up requirements added, updated reminder system. Evonne Reese
7/29/2014 Institutional Control Update An IC reminder letter was issued to the responsible party on this date. Kristin Thompson
11/10/2014 Document, Report, or Work plan Review - other Reviewed drinking water well monitoring results for 2008. All contaminants of concern were non-detect therefore future drinking water sampling is not required. All other institutional control requirements will remain in place. Evonne Reese
8/29/2019 Institutional Control Compliance Review An Institutional Controls reminder letter e-mailed to the landowner/responsible party on this date. Mossy Mead
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
Xylenes (total) > Human Health/Ingestion/Inhalation Soil
GRO 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
Excavation / Soil Movement Restrictions If excavation is planned for the area of Tank #4, a plan to address the xylenes contamination should be developed.
Advance approval required to transport soil or groundwater off-site. The on-site drinking water well will be sampled in the summer of 2005, and 2006; using Environmental Protection Agency (EPA) Method 524. RP must submit analytical results from the 2006 drinking water well sampling event.

No associated sites were found.

Missing Location Data

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