| Action Date |
Action |
Description |
DEC Staff |
| 10/25/2018 |
Document, Report, or Work plan Review - other |
On this date, a total of four groundwater samples were collected from the east and the west water wells. The west well is used for nonpotable purposes and the east well is currently inactive. The west well contained the PFAS summed concentrations (for PFHpA, PFHxS, PFNA, PFOS and PFOA) up to 0.05772 ug/L. The east well contained the PFAS summed concentrations up to 0.07637 ug/L. The ADEC draft summed action level for PFAS is 0.07 ug/L |
Grant Lidren |
| 12/19/2018 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 1/7/2019 |
Site Characterization Workplan Approved |
On this date, ADEC approved the 2019 Groundwater Investigation Work Plan Nordale Yard submitted by SLR and dated December 2018. During the week of January 7, 2019, four soil borings will be advanced and completed as monitoring wells. Soil and groundwater samples will be collected and analyzed for PFAS. The groundwater gradient will be evaluated. The vacant Black Gold property to the south and the private household 600 ft. to the east have been notified. Groundwater samples will be collected from the private household’s drinking water well. |
Grant Lidren |
| 1/29/2019 |
Update or Other Action |
On this date, ADEC received the sampling results from the private household drinking water well located 600 feet to the east of Nordale yard. No PFAS compounds were detected in the drinking water. |
Grant Lidren |
| 2/22/2019 |
Document, Report, or Work plan Review - other |
On this date, ADEC reviewed and approved the Private Well PFAS Sampling Plan, APCS Nordale submitted by Shannon & Wilson, dated February 21, 2019. At least 22 residential drinking water wells will be sampled for PFAS mid to late February 2019. |
Grant Lidren |
| 3/8/2019 |
Site Characterization Report Approved |
On this date, ADEC received the 2019 Groundwater Investigation Work Plan Phase II Nordale Yard submitted by SLR and dated March 2019. Up to seven soil borings will be advanced and completed as monitoring wells. One boring will be advanced to the east in the TAPS ROW check valve 73A. The rest of the borings will be advanced to the south within the Black Gold property. Soil and groundwater samples will be collected and analyzed for PFAS. The groundwater gradient will be evaluated. |
Grant Lidren |
| 4/10/2019 |
Update or Other Action |
ADEC received preliminary drinking water well sample results on this date. These samples were collected from private drinking water wells north, northwest and southwest of the APSC Nordale Yard during February 2019. Of the 30 drinking water wells sampled, none exceeded the most stringent historic DEC PFAS sum of five (PFHpA, PFHxS, PFNA, PFOS and PFOA) action level of 0.07 ug/L. |
Grant Lidren |
| 4/26/2019 |
Site Characterization Report Approved |
On this date, ADEC received the Nordale Yard Groundwater Investigation Report submitted by SLR and dated April 2019. None of the four on property monitoring wells (MW-1, MW-2R, MW-3, MW-4) contained contaminant concentrations above the ADEC Table C groundwater cleanup levels for PFOS or PFOA. Only MW-1 and MW-3 contained contaminant concentrations above the summed EPA PFOS and PFOA drinking water action level of 0.07 ug/L. MW-1 located at the northwest corner of the property contained the PFOS/PFOA summed concentrations at 0.1443 ug/L. MW-3 located at the south center end of the property contained the PFOS/PFOA summed concentrations at 0.0744ug/L. Two soil samples collected per boring (0 to 5 feet bgs and 6 to 17 feet bgs) during monitoring well advancement contained detectable concentrations of PFOS/PFOA, but below 18 AAC 75 method two soil cleanup levels. Six monitoring wells advanced off property to the south (MW-6 to MW-11) and one to the east in the TAPS ROW (MW-5) did not contain detectable concentrations of PFOS or PFOA in the groundwater. Two soil samples collected per boring (0 to 5 feet bgs and 6 to 17 feet bgs) during monitoring well advancement did not contain detectable concentrations of PFOS or PFOA. Groundwater was 7 to 16 feet bgs throughout the site. The groundwater flow was to the northwest. |
Grant Lidren |
| 5/10/2019 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the Work Scope, Removal of Selected Monitoring Wells submitted by SLR and dated May 9, 2019. The six south upgradient off property monitoring wells MW-6 through MW-11 will be decommissioned in accordance with the ADEC Monitoring Well Guidance. |
Grant Lidren |
| 6/6/2019 |
Update or Other Action |
On this date, ADEC received the Report, Removal of Selected Monitoring Wells; Nordale Yard Groundwater Project submitted by SLR and date June 6, 2019. Wells located upgradient to the south were decommissioned on June 3, 2019. These include monitoring wells MW-6 through MW-11. |
Grant Lidren |
| 8/21/2019 |
Site Visit |
Visited site on this date with Alyeska, SLR, and DNR. Pictures taken. |
Grant Lidren |
| 10/3/2019 |
Update or Other Action |
On this date, ADEC received the draft PRIVATE DRINKING-WATER WELL SUMMARY REPORT, ALYESKA PIPELINE SERVICE COMPANY NORDALE YARD submitted by Shannon & Wilson and dated September 20, 2019. A total of 30 off property downgradient drinking water wells were sampled for PFAS during February and April 2019. Sample results for the private drinking-water wells were all below 25 percent of the current EPA action level of 70 ppt for the sum of PFOS and PFOA. The maximum concentration detected was 15.7 ppt (sum of PFOS and PFOA). Furthermore, none of the 30 drinking water wells sampled exceeded the most stringent historic DEC PFAS sum of five (PFHpA, PFHxS, PFNA, PFOS and PFOA) action level of 70 ppt. |
Grant Lidren |
| 4/21/2023 |
Update or Other Action |
A letter was sent to residents west of the Nordale Road facility to offer additional private well sampling to update the Responsible Party's database of water quality for the area. Wells first sampled in 2019 were resampled in 2020. At the time, the Environmental Protection Agency's (EPA) and the Alaska Department of Environmental Conservation's (DEC) drinking water protection levels were established at 70 parts per trillion for two per- and poly-fluoroalkyl substances (PFAs) compounds. As of March 29, 2023, EPA proposed a Primary Drinking Water Regulation that establishes individual Maximum Contaminant Levels (MCLs) for Perfluorooctanesulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) at 4 parts per trillion for drinking water delivered through public systems. Additional water samples will be collected in 2023 from area resident's drinking water wells in anticipation of the EPA's final MCLs. |
Laura Jacobs |
| 4/8/2024 |
Document, Report, or Work plan Review - other |
A review of the 2023 Drinking Water Well Sampling Report was completed and was approved. Drinking water sample results from 23 residences downgradient from the Nordale Storage Yard indicate the sum of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) concentrations are below the DEC action level in 2023. DEC requested additional site characterization efforts. |
Laura Jacobs |
| 6/28/2024 |
Document, Report, or Work plan Review - other |
The 2024 Site Investigation Work Plan, submitted to our office May 17, 2024 was reviewed and approved after a brief Teams meeting with Alyeska staff. Twenty soil borings distributed across the southeastern quadrant surrounding the area that was historically used for fire training will be sampled for per- and polyfluoroalkyl substances (PFAS). Groundwater samples also will be collected from the two production wells and four groundwater monitoring wells. |
Laura Jacobs |
| 3/3/2025 |
Site Characterization Report Approved |
The DEC reviewed the 2024 Site Investigation Report. Additional soil and groundwater samples were collected in 2024 to investigate the extent of PFAS contamination at the site. The highest PFAS soil concentrations on site were found in the Southeast corner adjacent to groundwater wells with concentrations exceeding DEC cleanup levels. During the collecting of soil samples, fuel odor was discovered, resulting in an additional sample being collected and tested for petroleum contamination. The sample contained 2,580 mg/kg Diesel Range Organics (DRO), indicating that petroleum contamination is also present at the site. One additional residential property was sampled for PFAS in 2024, but did not have levels exceeding EPA's proposed 2027 maximum contamination levels (MCLs). The DEC requested documentation tracking residences with PFAS treatment systems installed and their maintenance/sampling schedules to be submitted and included on future reports. |
Pax Templeton |
| 4/17/2025 |
Document, Report, or Work plan Review - other |
The DEC reviewed the 2025 work plan and requested the addition of BTEX, PAHs, and VOCs to the list of potential contaminants of concerns to be tested for during delineation of petroleum contamination at the site in 2025. |
Pax Templeton |
| 5/29/2025 |
Site Characterization Workplan Approved |
The DEC reviewed and approved revision 2 of the 2025 Site Characterization Work Plan. Sitework in 2025 will continue to assess PFAS impacted groundwater in monitoring wells at the site, including the installation of two new monitoring wells in the center of the property. Following the discovery of a small area of DRO contaminated soil in 2024, four step out soil borings will be advanced to delineate horizontal extent of petroleum contamination. Revisions incorporated sampling of soil borings for additional analytes (BTEX, VOCs, and PAHs) into sampling methodology and included provisions for documenting storage and usage of GAC filtration system used on purge water. Presence of petroleum analytes in groundwater will be evaluated once contaminated soil has been delineated. |
Pax Templeton |
