| Action Date |
Action |
Description |
DEC Staff |
| 12/12/1990 |
Underground Storage Tank Site Characterization or Assessment |
Underground Storage Tank Removal Alaska Railroad Hurricane Section, MP 281 submitted by ENSR to ADEC on this date. A 500 gal. gasoline UST & a 7,500 gal. diesel UST were removed. At the diesel tank excavation, no GW was encountered at a depth of 8 ft. bgs. Contaminated soil was stockpiled on site. Seven soil samples were collected: three from the bottom; and one from each sidewall. Confirmation samples contained TPH up to 17,700 mg/kg. At the gas tank excavation, the top of the tank was buried @ ground level, therefore the excavation was shallow @ 4 ft. bgs and no GW was encountered. The only soil sample collected under the fill pipe contained TVPH up to 488 mg/kg. The excavation was then backfilled except for surface contaminated soils. The contaminated soil stockpile was moved to ARRC Gold Creek @ MP 263 where it awaited to be transferred for thermal remediation. |
Grant Lidren |
| 5/21/1991 |
Underground Storage Tank Site Characterization or Assessment |
SA1R; Reviewed a phase 1 site assessment. |
Former Staff |
| 4/10/1995 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77585 ADD; Site added to database. |
Former Staff |
| 4/10/1995 |
Site Added to Database |
|
Former Staff |
| 4/11/1995 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LCAU; LUST corrective action underway. : LCAU date changed DB conversion |
Former Staff |
| 12/13/2006 |
Exposure Tracking Model Ranking |
ETM: Baseline Ranking |
Jill Taylor |
| 3/19/2007 |
Update or Other Action |
File number issued 2258.26.008 (FKA L57.??). |
Aggie Blandford |
| 4/30/2009 |
Update or Other Action |
ADEC communication with ARRC indicates the stockpile no longer remains on site |
Grant Lidren |
| 7/27/2009 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the Work Plan for Soil Borings and Sampling Hurricane Siding dated May 2009, submitted by Clarus. Three soil borings will be collected from the former diesel UST location. The three soil borings will be installed south, southwest, and west and will be located as close as feasible to the former UST sidewall location. In particular near S1. If gross contamination is encountered in the borings, Clarus will step out to evaluate extent of contamination. Soil will be screened at 5 ft. intervals down to 20 ft. bgs. Two soil samples will be collected from each soil boring and analyzed for DRO, GRO, RRO and BTEX. |
Grant Lidren |
| 4/6/2010 |
Document, Report, or Work plan Review - other |
On this date, ADEC received Phase II Investigative Report Hurricane Siding, submitted by Clarus and dated April 2, 2010. Ten soil samples and one duplicate sample were collected from five soil borings advanced on the south, southwest, and west sides of the former diesel UST excavation. A hydrocarbon odor was noted at three of the five bore holes. At each borehole: one soil sample was collected from the GW interface at 5 to 6 ft. bgs and one soil sample was collected from the vadose zone at 2 to 3 ft. bgs. The soil samples contained GRO up to 936 mg/kg and DRO up to 84,400 mg/kg. A drinking water well, installed in 2000, is located 75 feet away from the known extent of soil contamination. The well log indicates the artesian wells static water level was over the top of the casing. The well is 60 feet bgs, below two clay layers. |
Grant Lidren |
| 8/17/2011 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the Work Plan for Soil Boring Groundwater Sampling Hurricane Siding submitted by RSE. Three soil borings will be advanced down gradient and completed as monitoring wells. Two soil samples will be collected per boring plus one duplicate. One sample will be collected from the GW interface and one will be collected from the highest PID reading. One groundwater sample will be collected from each MW plus one duplicate. |
Grant Lidren |
| 1/11/2012 |
Update or Other Action |
On this date, ADEC received the Site Characterization Report for ARRC Hurricane Siding submitted by RSE dated January 2012. Four soil borings were advanced and completed as monitoring wells. Five soil samples collected from each boring at a depth of 3 to 4 feet bgs contained contaminant concentrations below cleanup levels. Five groundwater samples collected from the four monitoring wells contained contaminant concentrations below cleanup levels with the exception of the down gradient MW RSE-4, which contained DRO at 1.52 mg/L. At RSE-4, In addition to the GW containing a HC odor, the soil contained a slight HC odor as well at 5 to 10 ft. bgs. Groundwater was encountered 5 to 10 feet bgs at the site and the groundwater was generally flowing to the north west. |
Grant Lidren |
| 8/31/2012 |
Site Characterization Workplan Approved |
On this date, ADEC approved the Hurricane Work Plan. All four MWs will be sampled |
Grant Lidren |
| 11/7/2012 |
Site Characterization Report Approved |
On this date, ADEC received the Final Groundwater Monitoring Report Hurricane Siding submitted by FES, dated October 24, 2012. Depth to GW was 2.9 to 3.5 feet bgs and GW was flowing north-northwest. RSE-1 and RSE-2 did not contain detectable concentrations of contaminants. RSE-3 and RSE-4 contained detectable concentration of contaminants, but below cleanup levels. RSE-3 contained DRO at 0.779 mg/L. RSE-4 contained GRO at 0.456 mg/L, DRO at 0.601 mg/L, ethylbenzene at 0.000970 mg/L, and xylenes at 0.00676 mg/L. RSE-4 contained a hydrocarbon odor. |
Grant Lidren |
| 5/10/2013 |
Risk Assessment Workplan Approved |
On this date, ADEC received the 2013 Groundwater Monitoring Work Plan Hurricane Siding submitted by FES dated May 9, 2013. The four onsite monitoring wells will be analyzed for GRO, DRO, RRO, and BTEX. Natural Attenuation parameters will also be analyzed. |
Grant Lidren |
| 7/8/2013 |
Potentially Responsible Party/State Interest Letter |
PRP letter sent to ARRC on this date. |
Grant Lidren |
| 10/3/2013 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the September 30, 2013 Groundwater Monitoring Report Hurricane Siding submitted by FES. The four onsite monitoring wells were analyzed for: GRO, DRO, RRO, BTEX; and the natural attenuation parameters ferrous iron and sulfate. Groundwater was encountered at 2.1 to 4.5 feet bgs flowing to the north-northwest. Only one of the MWs, RS-3 contained detectable concentrations of contaminants above cleanup levels with DRO at 5.51 mg/L and RRO at 1.34 mg/L. Additionally, RS-3 and RS-4 contained a hydrocarbon odor. Elevated ferrous iron concentrations were detected in RSE-3 and RSE-4 relative to RSE-1 and RSE-2. Elevated sulfate was detected in RSE-1 and RSE-2 relative to RSE-3 and RSE-4. |
Grant Lidren |
| 9/15/2014 |
Update or Other Action |
ARRC plans to monitor the onsite MWs September 2014, but postpone excavation activities until June 2015. |
Grant Lidren |
| 9/18/2014 |
Site Characterization Workplan Approved |
On this date, ADEC received the 2014 Groundwater Monitoring Work Plan Hurricane Siding submitted by FES dated May 9, 2013. The four onsite monitoring wells will be analyzed for GRO, DRO, RRO, and BTEX. |
Grant Lidren |
| 1/20/2015 |
Site Characterization Report Approved |
On this date, ADEC received the November 26, 2014 Groundwater Monitoring Report Hurricane Siding submitted by FES. The four onsite monitoring wells were analyzed for: GRO, DRO, RRO, BTEX; and the natural attenuation parameters ferrous iron and sulfate. Groundwater was encountered at 2.1 to 4.5 feet bgs flowing to the north-northwest. Only one of the MWs, RS-3 contained detectable concentrations of DRO above cleanup levels with DRO at 1.88 mg/L. Additionally, purge water from RS-3 and RS-4 contained a light to moderate hydrocarbon odor. Elevated ferrous iron concentrations and reduced sulfate concentrations were detected in RSE-3 and RSE-4 relative to RSE-2. |
Grant Lidren |
| 7/8/2015 |
Site Characterization Workplan Approved |
On this date, ADEC approved the 2015 Soil Removal Work Plan, Rev 1 Hurricane Siding dated July 8, 2015 submitted by FES. |
Grant Lidren |
| 1/26/2016 |
Offsite Soil or Groundwater Disposal Approved |
On this date, ADEC acknowledged that 131.61 tons of petroleum impacted soil was received by ASR. |
Grant Lidren |
| 2/8/2016 |
Site Characterization Report Approved |
On this date, ADEC received the 2015 Soil Removal Report, Rev 1 ARRC Hurricane Siding dated January 13, 2016 submitted by FES. The excavation was bisected by eight buried electrical lines manifesting the need for a north and a south excavation. At the north excavation, the excavation was limited by buried electrical lines to the east and south and to the west by an existing concrete foundation. Groundwater was encountered at 4.5 feet bgs and the depth of the excavation was 4 feet bgs. Two floor and four sidewall soil samples collected contained DRO up to 44,000 mg/kg, GRO up to 467 mg/kg, and benzene up to 0.132 mg/kg. At the south excavation, the excavation was limited by buried electrical lines to the north. Groundwater was encountered at 5.0 feet bgs and the depth of the excavation was 4.5 feet bgs to 3 feet bgs at the west part of the excavation based on field screen results. Three floor and five sidewall soil samples collected contained DRO up to 17,400 mg/kg and GRO up to 470 mg/kg. . Approximately 100 cy of contaminated soil were removed from the excavations and was capped with clean fill. Contaminated soil was transported to ASR for thermal remediation. |
Grant Lidren |
| 5/25/2016 |
Site Characterization Workplan Approved |
The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the 2016 Groundwater Sampling Work Plan, Rev 1 Hurricane Siding submitted by FES and dated May 20, 2016. ADEC has no objections to the Work Plan and FES may proceed pending the following comment: if free product or sheen are present in development or purge water, it will be containerized and transported to the oil water separator in the Anchorage Shop. ARRC must submit a Transport, Treatment, & Disposal Approval Form for Contaminated Media to ADEC prior to transport. |
Grant Lidren |
| 10/4/2016 |
Site Characterization Report Approved |
On this date, ADEC received the August 22, 2016 Groundwater Monitoring Report Hurricane Siding submitted by FES. The four onsite monitoring wells were analyzed for: GRO, DRO, RRO, BTEX; and the natural attenuation parameters ferrous iron and sulfate. Groundwater was encountered at 1.6 to 4.4 feet bgs flowing to the north-northwest. None of the groundwater samples from the monitoring wells contained contaminant concentrations above Table C groundwater cleanup levels. However, purge water from RS-3 contained a hydrocarbon odor. Elevated ferrous iron concentrations and reduced sulfate concentrations were detected in RSE-3 and RSE-4 relative to up gradient wells. |
Grant Lidren |
| 8/22/2017 |
Site Characterization Workplan Approved |
On this date, ADEC received and reviewed the Work Plan for Groundwater Sampling at ARRC MP 284.2 Talkeetna, Alaska ADEC File # 2258.26.008 Rev 1.0 submitted by RSE dated August 22, 2017. ADEC has no objections to this work plan and RSE may proceed. |
Grant Lidren |
| 2/15/2018 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the Final Letter Report for Groundwater Sampling at ARRC MP Hurricane Section submitted by RSE and dated November 28, 2017. Monitoring wells RSE-1, RSE-2, and RSE-3 were analyzed for: GRO, DRO, RRO, BTEX; RSE-4 was also analyzed for the full suite of VOCs and PAHS. Only monitoring wells RSE-3 and RSE-4 contained contaminant concentrations above table C groundwater cleanup levels with DRO up to 1.82 mg/L and naphthalene up to 3.08 ug/L. A sheen was observed during the purging of RS-4. Groundwater was encountered at 1.0 to 4.0 feet bgs. (Deviations include: RS-3, the historically most contaminated well, was supposed to be analyzed by lab method 8260 and 8270 - Instead, RS-4 was because it was suspected to be most contaminated due to visible sheen and there was no field duplicate collected for the 8260 and the 8270 methods.) |
Grant Lidren |
| 9/6/2018 |
Site Characterization Workplan Approved |
Approved GW monitoring work plan on this date. |
Grant Lidren |
| 4/23/2019 |
Site Characterization Report Approved |
On this date, ADEC received the Letter Report for Groundwater Sampling and Elevation Survey at ARRC MP 284.2 Hurricane Section submitted by RSE and dated April 10, 2019. Monitoring wells RSE-1, RSE-2, RSE-3, and RSE-4 were analyzed for: GRO, DRO, RRO, VOCs and PAHS. Only monitoring wells RSE-3 and RSE-4 contained contaminant concentrations above table C groundwater cleanup levels with DRO up to 2.73 mg/L and naphthalene up to 6.63 ug/L. Groundwater was encountered 1.0 to 5.0 feet bgs and flowing to the northwest. |
Grant Lidren |
| 9/20/2019 |
Site Characterization Workplan Approved |
On this date, ADEC rapproved the Work Plan for ARRC 2019 Hurricane Groundwater Assessment at ARRC MP 281.4 Rev 1.0 ADEC File # 2258.26.008 submitted by RSE and dated September 17, 2019. |
Grant Lidren |
| 10/9/2019 |
Document, Report, or Work plan Review - other |
Approved Work Plan deviation to 9/20/19 approved work plan. RSE will return to the site in October to drill down to groundwater at RSE-5, RSE-6, and RSE-7. RSE will also install an additional soil boring completed as a temporary monitoring well at proposed location RSE-10. a soil sample will also be collected from RSE-9 boring location (pid reading 1271 ppmv).(3/25/2020 update: Analytical soil samples were not collected from RSE-9 or RSE-10) |
Grant Lidren |
| 3/31/2020 |
Site Characterization Report Approved |
On this date, ADEC received the Letter Report for ARRC Hurricane Groundwater Monitoring 2019 Rev. 5.0 ADEC File No. 2258.26.008 submitted by RSE and dated March 31, 2020. Field activities including sampling existing monitoring wells:RSE-1, RSE-2, RSE-3 and RSE-4 and advancing five borings:RSE-5, RSE-6, RSE-7, RSE-8, and RSE-9. All samples were analyzed for GRO, DRO, RRO, VOCs and PAHS. The five soil borings were advanced to a max depth of 9 feet bgs. No groundwater was encountered. Analytical soil samples were collected from RSE-5, RSE-6, and RSE-7 at a depth of 1 to 3 feet bgs. Analytical soil samples were not collected from RSE-8 and RSE-9. Only downgradient borings RSE-6 and RSE-7 contained soil contamination above cleanup levels with 1-methylnapthalene up to 2.15 mg/kg, 2-methylnapthalene up to 2.94 mg/kg, naphthalene up to 0.948 mg/kg, 1,2,4-TMB up to 3.67 mg/kg, 1,3,5-TMB up to 1.87 mg/kg, and DRO up to 2,610 mg/kg. None of the four historic monitoring wells sampled contained groundwater contamination above table C cleanup levels. Groundwater was encountered 1.5 to 4.5 feet bgs and flowing to the northwest. |
Grant Lidren |
| 9/14/2020 |
Site Characterization Workplan Approved |
On this date, ADEC received the ARRC Hurricane Siding Site Characterization Work Plan Rev. 2.0 ADEC File No. 2258.26.008 submitted by RSE and dated September 4, 2020. three pairs of nested monitoring wells will be advanced and completed as monitoring wells. Additionally a boring will be advanced at the RSE-9 historic location. A total of up to 13 soil samples will be collected and groundwater will be sampled from the monitoring wells.
|
Grant Lidren |
| 5/18/2021 |
Site Characterization Report Approved |
ADEC has reviewed a site characterization report received on this day. The objectives of the September 2020 field efforts were to provide additional site characterization data to determine the vertical and horizontal extent of contamination present west and northwest of the tool shed located at the subject property. Originally the approved work plan was for the installation of 3 sets of nested wells; however, due to the lithology observed during the installation of RSE-13 and RSE-14, and the presence of a dense clay layer at RSE-12, it was determined that the same dense clay layer was likely present in these soil borings. ADEC project manager G. Lidren approved a field deviation for the potential confining layer which allowed for RSE-11, RSE-12, and RSE-15 to be completed as monitoring wells down to the clay interval rather than installing two more sets of nested wells and one soil boring at the 2019 location for RSE-9. The final site characterization efforts included the installation of 5 soil borings (RSE-11, RSE-12, RSE-13, RSE-14, and RSE-15) and the collection of (2) soil samples from each, including a duplicate. Analytical results from soil samples RSE-11A and its duplicate RSE-X, RSE-11C, RSE-14C and RSE-15B contained DRO ranging from 2,990 mg/Kg to 22,300 mg/Kg, above the migration to groundwater (MTG) cleanup level (CL) of 250 mg/Kg and some above human health cleanup level of 10,250 mg/Kg. DRO results for all other soil samples were below the MTG CL. Samples RSE-14H and RSE-14J collected at 14.5 ft and 18.5 ft bgs yielded values below the MTG soil CL. Indicating vertical impacts may be limited to the unconfined shallow groundwater and do not extend below the clay layer at ~10 feet bgs. GRO and RRO results for all soil samples were either non-detect or below the MTG CLs. In addition, samples contained Ethylbenzene, 1-methylnaphthalene, 2-methylnaphthalene, Naphthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenene, and Xylenes above MTG CLs.
Following soil sample collection, borings were converted to monitoring wells and (1) groundwater sample was collected from each new and existing MW and analyzed for GRO, DRO, RRO, Petro VOCs, and PAHs; a duplicate sample was also collected. All MWs were also included in a groundwater elevation survey. Groundwater depths ranged between 1’bgs to 4.5’bgs and consistent with 2018 and 2019 results, the groundwater elevation survey showed a shallow gradient towards the northwest. DRO results in groundwater samples RSE-3, RSE-4, RSE-11, RSE-12, RSE-13, RSE-15 and its blind duplicate RSE-X ranged from 2.3 mg/L to 39.2 mg/L, above the ADEC Groundwater Cleanup Level (GCL) of 1.5 mg/L. DRO, all others results were below the GCL. RRO results for groundwater samples RSE-4, RSE-11, RSE-13, RSE-15 and its blind duplicate RSE-X ranged from 1.4 mg/L to 1.81 mg/L, above the GCL of 1.1 mg/L. All other RRO results were below their GCL. GRO results for groundwater samples RSE-15 and its blind duplicate RSE-X were 3.11 mg/L and 2.5 mg/L, respectively, above the GCL. GRO results for all other groundwater samples were non-detect or below their GCL. In addition, ethylbenzene, naphthalene, 1-methylnaphthalene, 1,2,4-trimethylbenzene, and total xylenes were found in one or more MWs above GCLs. Horizontal extent of contamination will be evaluated further.
|
Jamie Grant |
| 6/8/2021 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77585 USTs. |
Jamie Grant |
| 8/3/2021 |
Meeting or Teleconference Held |
Meeting with ARRC and RSE to discuss site and plans for 2021/2022. |
Jamie Grant |
| 10/12/2021 |
Site Characterization Workplan Approved |
On this day, ADEC received a work plan for site characterization of soil and groundwater contamination. The plan includes soil samples collected from 5 new step-out borings (RSE-16 through RSE-20); each boring will be completed as permanent monitoring well. A groundwater elevation survey will be completed of all monitoring wells and groundwater samples will be collected from RSE-3, RSE-4, and RSE-11 through RSE-20. A sample will also be collected from emergent groundwater along the creek shore. The work plan is approved. |
Jamie Grant |
