| Action Date |
Action |
Description |
DEC Staff |
| 7/23/2010 |
Document, Report, or Work plan Review - other |
ADEC received the Class V Injection Well Sampling ADOT&PF Maintenance Facilities, Various Locations submitted by Shannon & Wilson and dated July 23, 2010. This report discusses preliminary sampling at multiple DOT maintenance shops including Chulitna, Homer, and Silvertip. Two discharge points were evaluated at Chulitna and Homer while only one discharge point was evaluated at Silvertip. The depth of borings ranged as follows: 10 feet Silvertip (two soil samples collected at 8 to 10 feet bgs), 20 feet Chulitna (soil samples collected at 13 to 15 feet bgs and 18 to 20 feet bgs), and 11 feet Homer (soil samples collected 4.5 to 6.5 feet bgs and 7 to 9 feet bgs). Soil samples were analyzed for VOCs, SVOCs, and metals. Silvertip, Chulitna, and Homer all contained Chromium and arsenic above clean up levels(which could be attributed to background). Silvertip did not contain any other contaminant concentrations above cleanup levels. Chultina contained naphthalene up to 0.830 mg/kg, 1,2,4-trimethylbenze up to 1.51 mg/kg, 1,3,5-trimethylbenzene up to 1.51 mg/kg, and 2-methylnaphthalene up to 8.67 mg/kg above cleanup levels. Homer contained TCE up to 0.0626 mg/kg above the cleanup level. |
Grant Lidren |
| 3/15/2016 |
Update or Other Action |
ADEC received the Homer Class V Injection Well Closure Report submitted by R&M and dated March 2016. Soil sample results from this injection well contain contamination above ADEC method two cleanup levels and extent of contamination has not been determined. A soil sample collected from boring HMR16-DP at a depth of 1.5 to 2.5 feet below ground surface, which had hydrocarbon odor and black appearance, contained 1,1,2-trichloroethane up to 0.0422 milligrams per kilogram (mg/kg) which is above the 2008 ADEC migration to groundwater cleanup level of 0.018 mg/kg. Second, multiple contaminants were detected above the ADEC 2016 updated cleanup levels which include 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, naphthalene and TCE. Third, multiple analytes contain elevated limits of quantitation (LOQ) above ADEC 2008 and 2016 cleanup levels (i.e. qualitatively estimated with a J flag). |
Grant Lidren |
| 4/20/2016 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 4/20/2016 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79905 name: Class V Injection Well |
Mitzi Read |
| 7/26/2016 |
Update or Other Action |
On this date, EPA sent the Approval of Closure Plan for One Motor Vehicle Waste Disposal Well at ADOT&PF Homer Highway Maintenance Station. |
Grant Lidren |
| 8/2/2016 |
Document, Report, or Work plan Review - other |
ADEC received the Homer Maintenance Station Retention Pond Installation Field Screening Activities Report dated August 2 submitted by RSE (note: ADEC did not approve the work plan). Activities included installation of a lift station adjacent to maintenance shop, 265 linear feet of buried arctic drain pipe, and construction of a drainage retention pond at the UIC location. During activities, pid field screen samples were collected during the excavations and from the stockpiles. At the lift station, PID results were up to 76.6 ppmv from a sample collected 5 feet bgs. At the arctic drain pipe first 110 linear feet north of lift station, soil had a hydrocarbon odor with PID results up to 2,713 ppmv from a sample collected 4 feet bgs. Screening samples collected for the rest of the 155 linear feet leading to the retention pond (starting 20 feet north of the pavement break) had pid results up to 6.5 ppmv at 3 feet bgs. At the retention pond, PID results were up to 5.9 ppmv. Approximately 60 cy of suspected contaminated soil was stored on a 20 mil liner onsite from excavation activites. Soil that was deemed suitable for reuse (based off pid readings) was put back in the excavations. |
Grant Lidren |
| 11/4/2016 |
Site Characterization Workplan Approved |
The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the ADOT&PF Homer M&O Station UIC Closure Work Plan submitted by Restoration Science & Engineering (RSE) dated November 2016. ADEC has no objections to this work plan and RSE may proceed. |
Grant Lidren |
| 11/7/2016 |
Document, Report, or Work plan Review - other |
The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the Homer Maintenance & Operations Station Retention Pond Installation Stockpile Soil Sampling Work Plan submitted by Restoration Science & Engineering (RSE) dated November 4,2016. ADEC has no objections to the work plan and RSE may proceed. |
Grant Lidren |
| 1/3/2017 |
Document, Report, or Work plan Review - other |
ADEC received a Report with this date titled: Homer Maint. and Operations Station Retention Pond Installation Stockpile Soil Sampling Characterization Report submitted by RSE. Four soil samples collected 1 to 1.5 feet into the 60 cy retention pond installation stockpile contained contaminant concentration above method two cleanup levels including: DRO up to 854 mg/kg, benzene up to 25.3 ug/kg, ethylbenzene up to 386 ug/kg, xylenes up to 2,270 ug/kg, 1,2,4-trimethylbenzene up to 1,320 ug/kg, naphthalene up to 264 ug/kg, and 1-methylnapthalene up to 1.03 mg/kg. |
Grant Lidren |
| 3/3/2017 |
Site Characterization Report Approved |
On this date, ADEC received the ADOT&PF Homer M&O Station UIC Removal & Characterization Report, Rev. 1 submitted by RSE and dated March 2017. 480 cy of presumed clean soil was segregated from 110 cy of presumed dirty soil during closure of the mounded soil absorption system (SAS). A total of 19 soil samples were collected from the excavation sidewalls and bottom. Two soil samples collected from the west sidewall at 4 feet bgs contained DRO up to 1,290 mg/kg (note: the excavation was limited by the DOT security fence to the west). A soil sample collected from the excavation bottom at 6 feet bgs contained PCE up to 0.432 mg/kg. The rest of the soil samples collected from the excavation sidewall and bottom were below method two cleanup levels, however, the detection limit for some analytes were above ADEC cleanup levels. Soil samples collected from the 480 cy presumed clean stockpile did not contain contaminant concentrations above method two cleanup levels. Soil samples collected from the 110 cy presumed dirty stockpile contained trichloroethene (TCE) up to 0.137 mg/kg, diesel range organics up to 1,750 mg/kg, naphthalene up to 0.150 mg/kg, and 1,2,4-trimethylbenzene up to 0.472 mg/kg. |
Grant Lidren |
| 3/10/2017 |
Update or Other Action |
EPA sent a letter dated 3/10/2017 to DOT conditionally closing the Class V underground injection well. |
Grant Lidren |
| 3/29/2017 |
Update or Other Action |
On this date, ADEC approved the transport of the 480 cy uncontaminated stockpile to 3425 Sterling Highway. this soil will be used as fill 1 to 2 feet deep and capped with a thick layer of gravel and compacted. This work will be conducted early summer 2017. |
Grant Lidren |
| 4/10/2017 |
Offsite Soil or Groundwater Disposal Approved |
On this date, DOT completed transport of the 480 cy uncontaminated stockpile to 3425 Sterling Highway. |
Grant Lidren |
| 6/14/2017 |
Offsite Soil or Groundwater Disposal Approved |
On this date, ADEC approved the transport of 60 cy stockpile was removed along 265 linear feet from the lift station, arctic drain pipe trench, and retention pond area. This soil soil will be transported to the Columbia Ridge Landfill in Oregon. Contaminants of Concern include: Diesel range organics, Benzene, Ethylbenzene, xylenes, 1,2,4-trimethylbenzene, 1-methylnapthalene, and Naphthalene. (Note: this contaminated soil was also from the site known as 2314.26.002 ADOT&PF Homer Facility. Additionally, some of the contaminated soil encountered along the arctic drain pipe trench may be from a new unknown source area).
|
Grant Lidren |
| 6/14/2017 |
Offsite Soil or Groundwater Disposal Approved |
On this date, ADEC approved the transport of a 210 cy stockpile removed from the leach field/ class V well discharge point. This soil was transported to the Columbia Ridge Landfill in Oregon (received on August 17, 2017). Contaminants of Concern include: trichloroethene (TCE), Diesel range organics, Naphthalene, and 1,2,4-trimethylbenzene. |
Grant Lidren |
| 5/30/2024 |
Site Characterization Workplan Approved |
Approved work plan for targetted excavation of DRO contaminated soil, and borings to investigate extent of contamination and potential impacts to groundwater. |
Michael Hooper |
