| Action Date |
Action |
Description |
DEC Staff |
| 11/3/2008 |
Document, Report, or Work plan Review - other |
On this date Oasis performed a site investigation of the TF to evaluate the secondary containment, document cleanup efforts, and attempt to delineate contamination outside the secondary containment area. A tear in the lining was discovered within the secondary containment area. Surface soil sample results contained GRO up to 2,910 mg/kg, DRO up to 17,600 mg/kg, benzene up to 0.398 mg/kg, toluene up to 26.2 mg/kg, ethylbenzene up to 39.8 mg/kg, and xylenes up to 269 mg/kg. |
Grant Lidren |
| 7/31/2009 |
Document, Report, or Work plan Review - other |
On this date Oasis installed well points and test pits to further evaluate extent of contamination. 22 out of the 47 testpits advanced to the groundwater interface at 2 to 4 feet bgs, contained sheening or visible floating free product. 21 soil samples collected from 21 testpits contained: GRO up to 9,370 mg/kg; DRO up to 10,800 mg/kg; benzene up to 2.28 mg/kg; toluene up to 76.4 mg/kg; ethylbenzene up to 102 mg/kg; and xylenes up to 596 mg/kg. Water samples collected from the six well points contained: GRO up to 7.08 mg/L; DRO up to 5.38 mg/L; benzene up to 0.0845 mg/L; and ethylbenzene up to 0.757 mg/L. |
Grant Lidren |
| 9/9/2009 |
Spill Transferred from Prevention Preparedness and Response Program |
Spill transferred by PERP staff Mark Sielaff. Spill no. 08269930401; spill date = 10/30/08; substance = Jet A fuel; quantity = 13,630 gallons to secondary containment, 2,777 gallons to ground surface; source = tank #471. |
Mitzi Read |
| 9/10/2009 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 9/10/2009 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 78815 name: Crowley Jet A Fuel Tank 471 |
Mitzi Read |
| 9/11/2009 |
Potentially Responsible Party/State Interest Letter |
On this date, ADEC sent an RP letter to Crowley Maritime Corporation. |
Grant Lidren |
| 9/29/2009 |
Document, Report, or Work plan Review - other |
ADEC received and approved (pending comments) a workplan submitted by Oasis to further evaluate extent of contamination in the Fall of 2009. |
Grant Lidren |
| 7/26/2010 |
Document, Report, or Work plan Review - other |
On this date ADEC received Additional Site Characterization Report Newhalen Tank Farm, submitted by Oasis, dated January 14, 2010. The field effort was conducted from 9/21/09 to 9/24/09 and involved the sampling and advancement of well points and test pits to further evaluate extent of contamination. Twenty-one test pits were excavated 2 to 4 ft. bgs dependent upon the GW interface. Four were advanced around the pad to analyze for TOC and 17 were mainly advanced S to SE of the pad to PID screen for GRO, DRO, RRO, and BTEX; Two screening samples were collected from each testpit; one from 6 inches bgs and one from the GW interface. A total of 15 analytical soil samples were collected. The five TOC soil samples collected contained TOC up to 10,000 mg/kg. The ten soil samples collected for petroleum analysis contained GRO up to 950 mg/kg, DRO up to 17,200 mg/kg, ethylbenzene up to 12.4 mg/kg, and total xylenes up to 87.1 mg/kg (note: hydrocarbon odors and slight sheening on the groundwater was noted in some of the testpits). In addition to the soil sampling effort, a total six wellpoints were installed south of the pad footprint. Groundwater samples from these six wells in addition to six previously installed well points (equaling a total of 12 GW samples) contained GRO up to 9.73 mg/L, DRO up to 8.96 mg/L, and benzene up to 0.0506 mg/L. |
Grant Lidren |
| 8/12/2010 |
Document, Report, or Work plan Review - other |
On this date ADEC received and approved (pending comments) Former Newhalen Tank Farm Groundwater Characterization Work Plan, submitted by Oasis, dated August 10, 2010. Six soil borings will be advanced and completed as monitoring wells. Groundwater wells will be installed and 12 existing temporary well points will be removed. Two of the proposed monitoring wells will be advanced downgradient to establish the southern extent of the plume. Four of the proposed monitoring wells will be advanced north, east, south, and west to replace former wellpoint locations. One subsurface sample will be collected from each boring above the groundwater interface. Soil and ground water samples at the site will be analyzed for DRO, RRO, GRO, and BTEX. |
Grant Lidren |
| 8/16/2010 |
Meeting or Teleconference Held |
On this date ADEC had a short teleconference with Crowley. Crowley indicates that contamination at this site will be removed and/or remediated in the future. |
Grant Lidren |
| 1/25/2011 |
Update or Other Action |
ADEC received Former Newhalen Tank Farm Groundwater Characterization Report, dated January 21, 2011, submitted by Oasis. Eight soil borings were advanced 10 ft. bgs and completed as monitoring wells MW-1 through MW-8. Ten soil samples and one duplicate were collected. One soil sample and a duplicate collected during the advancement of MW-5 at 4 to 5 feet bgs at the GW interface contained GRO up to 1,490 mg/kg, DRO up to 3,420 mg/kg, and ethylbenzene up to 7.3 mg/kg. All other soil samples collected did not contain contaminants above ADEC cleanup levels. A hydrocarbon odor was noted in the soil at subsurface depths at: MW-1; MW-3; MW-4; MW-7; and MW-8. PID screening indicates, MW-3 contained 572 ppmv @ 7 ft. bgs, MW-4 contained 125 ppmv at 7.5 ft. bgs, MW-5 contained 427 ppmv at 3 ft. bgs. Groundwater was encountered 3.5 to 6.0 ft. bgs flowing east-southeast. Hydrocarbon odor was noted in the purge water at MW-2 and MW-3 located east and south east of the site and MW-5 located on site. These three MWs out of eight were the only MWs to contain contaminants above ADEC cleanup levels with GRO up to 4.29 mg/L (MW-5), DRO up to 2.48 mg/L (MW-5) and benzene up to 0.0255 (MW-2). |
Grant Lidren |
| 3/9/2011 |
Meeting or Teleconference Held |
On this date, ADEC held a teleconference with the City of Newhalen, ANTHC, Crowley, and Oasis to discuss the site’s history and proposed cleanup actions. |
Grant Lidren |
| 3/23/2011 |
Document, Report, or Work plan Review - other |
ADEC reviewed and approved (pending comments) the 2011 GW Monitoring Work Plan Former Newhalen TF. The eight MWs will be analyzed Quarterly in March 2011, June 2011, September 2011, and December 2011 |
Grant Lidren |
| 6/3/2011 |
Document, Report, or Work plan Review - other |
ADEC received Newhalen Tank Farm Soil Removal and Treatment Work Plan submitted by Oasis, dated May 19, 2011. Spot soil excavations will be performed at eight locations, which contain contaminant levels above ADEC ingestion/inhalation levels, and land farmed on site. Confirmation soil samples will be collected from each location and backfilled with clean fill. Pre-treatment samples will also be collected from the land farm area. |
Grant Lidren |
| 7/29/2011 |
Site Characterization Report Approved |
On this date, ADEC received the 2011 Quarterly Groundwater Monitoring in March 2011; Former Newhalen Tank Farm submitted by Oasis and dated May 13, 2011. The GW elevation averaged 3.2 ft. deeper than observed in August 2010 and appeared to flow south-southeast. Frozen water conditions were encountered in MW-3 through MW-6; therefore, these MWs were not sampled. Out of the four MWs sampled: MW-1, MW-2, MW-7, and MW-8; only MW-2 contained contamination above ADEC cleanup levels with GRO at 2.3 mg/L. (Note: the lab was not approved to conduct the 3511 extraction method for AK102/ AK103 used for this investigation. The 3511 extraction method is conducted on 40 ml vials instead of the ADEC required 1L amber jars. The AK102/103 data produced by this unapproved extraction method should be considered qualified for this project.) |
Grant Lidren |
| 10/6/2011 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the June 2011 Quarterly GW Monitoring Former Newhalen TF submitted by Oasis, dated August 8, 2011. GW samples were collected (to the depth of water between 4.38 ft. to 7.21 ft. bgs) from the eight monitoring wells. Odor was noted from monitoring wells MW-2, MW-5, and MW-8. Three of the eight monitoring wells contained contaminants above ADEC cleanup levels. These monitoring wells, which included MW-2, MW-3, and MW-5, contained GRO up to 8.2 mg/L and DRO up to 13 mg/L (note: the ADEC requires the minimum of one surrogate per method, however the lab data contains the same surrogate for method AK102 and method AK103). |
Grant Lidren |
| 12/15/2011 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the September 2011 Quarterly GW Monitoring Former Newhalen TF submitted by Oasis, dated August 8, 2011. GW samples were collected (to the depth of water between 3.82 ft. to 6.68 ft. bgs) from the eight monitoring wells flowing to the south-southeast. Odor was noted from monitoring wells MW-5, and MW-8. Three of the eight monitoring wells contained contaminants above ADEC cleanup levels. These monitoring wells, which included MW-2, MW-3, and MW-5, contained GRO up to 8.9 mg/L, DRO up to 4.5 mg/L, and benzene up to 0.071 mg/L. |
Grant Lidren |
| 4/24/2012 |
Meeting or Teleconference Held |
On this date, ADEC had a meeting with Crowley and Weston Solutions to discuss tilling of the landfarm and groundwater monitoring during the 2012 summer season. |
Grant Lidren |
| 5/7/2012 |
Site Characterization Report Approved |
On this date, ADEC received the Soil Excavation Completion; Former Newhalen Tank Farm, Newhalen, Alaska Final Report submitted by Oasis dated December 22, 2011. 2,800 cubic yards of contaminated soil was excavated to a depth on 3 to 5 feet bgs. Due to sheening and free product on groundwater during excavation work, Chadux Corp. was contracted and recovered 200 gallons of fuel. The depth of groundwater was generally 1.5 to 2.0 feet bgs. Thirty-four side wall samples collected every 20 linear feet contained GRO up to 320 mg/kg and DRO up to 2,000 mg/kg, however some GRO/BTEX samples were preserved w/ NaHSO4 and are considered bias low; the use of NaHSO4 as a preservative is not acceptable by ADEC. The majority of contaminated soil was noted at the east excavation sidewall. The excavations were brought to grade with clean fill and the contaminated soil was placed in an 18 inch thick landfarm on top of the clean fill. The land farm was tilled once in 2011. |
Grant Lidren |
| 5/10/2012 |
Site Characterization Workplan Approved |
On this date, ADEC approved the final 2012 Work Plan; Former Newhalen Tank Farm; submitted by Weston dated May 10, 2012. Four test pits will be advanced in the vicinity of samples EC-15, EC-19, EC-20 and EC-22, which are located on the east and west side of the excavation. The test pits will be excavated to the groundwater interface screened every foot, and the sample with the highest PID reading from each test pit and analyzed for GRO and BTEX. The landfarm will be tilled monthly (May, June, July, August and September) using a tracked excavator. High-nitrogen (Urea) fertilizer will be added after initial tilling in May, to enhance bioremediation. Initial landfarm progress soil samples will be collected in May at eight random locations for off-site confirmation. Fourteen landfarm progress soil samples will then be collected in September. |
Grant Lidren |
| 5/11/2012 |
Site Characterization Workplan Approved |
On this date, ADEC approved the 2012 Groundwater Monitoring Work Plan; Former Newhalen Tank Farm submitted by Weston dated May 4, 2012. The eight MWs will be sampled twice this summer. |
Grant Lidren |
| 8/24/2012 |
Update or Other Action |
On this date, ADEC received the 2012 Newhalen Landfarm Sampling and Maintenance; Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002 submitted by Weston. The four test pits advanced to the GW interface at 16 to 18 inches bgs in the vicinity of historic testpits EC-15, EC-19, EC-20 and EC-22, contained DRO up to 2,890 mg/kg(note: the GRO for the EC-22 sample was rejected due to low surrogate recovery). Nine land farm performance samples collected between 12 to 14 inches bgs, contained GRO up to 528 mg/kg and DRO up to 2,960 mg/kg. After sampling, fertilizer was added to the land farm and tilled. |
Grant Lidren |
| 2/25/2013 |
Update or Other Action |
On this date, ADEC received the “FORMER NEWHALEN TANK FARM 2012 ANNUAL GROUNDWATER MONITORING REPORT” submitted by Weston dated February 25, 2013. The eight on site MWs were sampled in July and October 2012. During the July sampling event, detectable levels of contaminants were found in all the MWs with the exception of MW-4 and MW-6. Only two MWs contained contaminants above cleanup levels with MW-2 containing DRO at 1.8 mg/L and MW-5 containing GRO up to 4.25 mg/L and DRO up to 2.9 mg/L. During the October sampling event, detectable levels of contaminants were found in all the MWs with the exception of MW-4 and MW-6. Only two MWs (the same MWs from the July sampling event) contained contaminants above cleanup levels with: MW-2 containing GRO at 2.99 mg/L, DRO at 2.0 mg/L, and RRO at 1.4 mg/L; and MW-5 containing GRO up to 4.3 mg/L and DRO up to 2.5 mg/L (note: GW was .75 foot shallower in October in these MWs). GW in the MWs was generally encountered 2 to 5 feet bgs in July and 1 to 4 feet bgs in October. During the sampling events, HC odor noted in MW-1. MW-2, MW-3, and MW-5. |
Grant Lidren |
| 2/27/2013 |
Update or Other Action |
ADEC received the Annual Summary Report – 2012 Newhalen Landfarm Sampling and Maintenance; Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002 submitted by Weston, dated February 27, 2013. The land farmed was tilled a total of five times in 2012. Post-season landfarm progress samples were not collected due to frozen conditions encountered on October 25, 2012. |
Grant Lidren |
| 5/3/2013 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the 2013 Groundwater Monitoring Work Plan; Former Newhalen Tank Farm dated May 3, 2013. MWs: 2, 3, 5, and 8 will be analyzed for GRO, DRO, RRO, and BTEX. |
Grant Lidren |
| 5/8/2013 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the 2013 Landfarm Operations Work Plan; Former Newhalen Tank Farm; submitted by Weston dated May 3, 2013. monthly aeration tilling will occur May, June, July, August, and September using a tracked excavator. Fourteen treatment progress sampling will occur in May and again in September 2013. |
Grant Lidren |
| 7/22/2013 |
Site Characterization Report Approved |
On this date, ADEC received the 2013 Groundwater Monitoring Report; Former Newhalen Tank Farm Newhalen, Alaska; ADEC File No. 2619.38.002 submitted by Weston dated July 22, 2013. MWs: 2, 3, 5, and 8 were analyzed for GRO, DRO, RRO, and BTEX. Only MWs: 2, 3, and 5 contained contaminants above cleanup levels. MW-2 contained GRO at 2.3 mg/L and benzene at 0.01 mg/L. MW-3 contained DRO at 1.8 mg/L. MW-5 contained GRO at 4.0 mg/L and DRO at 4.6 mg/L. The depth to GW throughout the site was 2 to 5 feet bgs flowing to the southeast. |
Grant Lidren |
| 7/24/2013 |
Update or Other Action |
On this date, ADEC received the May 2013 Summary Report –Newhalen Landfarm Sampling and Maintenance Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002 submitted by Weston dated July 24, 2013. The land farm was tilled on May 23. Fourteen performance samples collected on May 24th contained GRO up to 310 mg/kg and DRO up to 1,900 mg/kg. (note: The PQL for benzene was elevated above the ADEC CL of 0.025 mg/kg; however, there were no detects above the LOD, which was below the ADEC CL.) |
Grant Lidren |
| 12/18/2013 |
Update or Other Action |
On this date, ADEC received the October 2013 Summary Report –Newhalen Landfarm Sampling and Maintenance Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002 submitted by Weston dated December 13, 2013. The land farm was tilled in May, June, July, August, and October. Sixteen performance samples collected on October 6th contained GRO up to 40 mg/kg and DRO up to 1,000 mg/kg. (note: There were no detects in any of the benzene samples. However, the PQL for 15 of the 16 benzene samples was elevated above the ADEC CL of 0.025 mg/kg. The LOD in two of these 15 samples was above the ADEC CL at concentrations of 0.027 mg/kg.) |
Grant Lidren |
| 3/19/2014 |
Meeting or Teleconference Held |
Meeting held with Weston and Crowley on this date to discuss Spring field effort. |
Grant Lidren |
| 6/4/2014 |
Site Characterization Report Approved |
On this date, ADEC received the 2014 GW Monitoring WP; Former Newhalen Tankfarm CPD AK submitted by Weston dated June 2, 2014. Monitoring wells MW-2, MW-3, and MW-4 will be sampled for petroleum constituents. |
Grant Lidren |
| 6/5/2014 |
Site Characterization Workplan Approved |
On this date, ADEC approved the 2014 Landfarm Operation Work Plan: Former Newhalen Tank Farm submitted by Weston and dated April 8, 2014. |
Grant Lidren |
| 8/20/2014 |
Site Characterization Report Approved |
On this date, ADEC received the “June 2014 Newhalen land farm Sampling and Maintenance Summary Report Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002” submitted by Weston dated August 20, 2014. Sixteen performance samples collected on June 10 contained GRO up to 82.2 mg/kg and DRO up to 2,540 mg/kg. The land farm was tilled on June 27, 2014. The land farm will be tilled again in July (w/ urea amendments), August, September, and October. Performance samples will be collected after the fall tilling events and five soil samples will be collected from the land farm footprint. |
Grant Lidren |
| 8/28/2014 |
Site Characterization Report Approved |
On this date, ADEC received the “June 2014 Groundwater Monitoring Report, Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002” submitted by Weston dated August 28, 2014. MWs: 2, 3, and 5 were analyzed for GRO, DRO, RRO, and BTEX. Only MW 5, located at the former tank farm, contained contaminants above cleanup levels with DRO up to 1.79 mg/L (note:temp blank was 9.6C). The depth to GW throughout the site was 2 to 4.5 feet bgs flowing to the southeast. |
Grant Lidren |
| 9/5/2014 |
Update or Other Action |
Five footprint samples will be collected during the fall landfarm sampling event. Weston is anticipating the sampling event to be conducted in late September or early October. Footprint samples will be collected from the backfill/native soil from five locations beneath the landfarm soil identified with the highest PID results identified during the field/grid screening. The landfarm soil is approximately 24 inches thick and will be scraped away to expose the backfill/native soil with the excavator bucket. Footprint samples will be collected from the 0-6 inches of the exposed soil using clean dedicated soil scoops and screened with a PID as well. Soil samples will also be collected from the grids as described in the workplan and performed during the June sampling event |
Grant Lidren |
| 1/16/2015 |
Site Characterization Report Approved |
On this date, ADEC received the “October 2014 Newhalen Landfarm Sampling and Maintenance Summary Report Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002” submitted by Weston dated January 15, 2015. A total of 21 soil samples were collected which all contained DRO over ADEC Method 2 cleanup levels. Sixteen performance soil samples collected 0 to 2 feet into the landfarm on October 3, 2014 contained DRO up to 1,310 mg/kg. Five footprint soil samples collected 2 to 2.5 feet bgs in the assumed clean fill under the landfarm contained DRO up to 7,140 mg/kg. Additionally, the footprint soil samples contained a petroleum odor. The land farm was tilled June 26th, July 24th, September 1st, and October 4th 2014. Urea amendments were added during the July tilling event. |
Grant Lidren |
| 5/21/2015 |
Meeting or Teleconference Held |
ADEC attended meeting with CPD and Weston to discuss the 2015 field season on this date. |
Grant Lidren |
| 1/18/2016 |
Site Characterization Report Approved |
On this date, ADEC received the “June 2015 Groundwater Monitoring Report, Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002” submitted by Weston dated January 18, 2016. MWs: 2, 3, and 5 were analyzed for GRO, DRO, RRO, and BTEX. MW 5, located at the former tank farm, contained contaminants above cleanup levels with DRO up to 2.89 mg/L with a slight odor noted. MW-2 contained contaminants above cleanup levels with DRO at 3.61 mg/L and RRO at 1.5 mg/L. MW-3 contained detectable concentrations of petroleum constituents, but below cleanup levels. The depth to GW throughout the site was 3.6 to 5.73 feet bgs (which is 1 to 2 feet below the 2014 sampling event but within historical ranges) flowing to the southeast. |
Grant Lidren |
| 4/8/2016 |
Site Characterization Report Approved |
On this date, ADEC received the “October 2015 Newhalen Landfarm Sampling and Maintenance Summary Letter Report Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002” submitted by Weston dated April 8, 2016. A total of 17 soil samples were collected: six from a depth of 1.0 to 1.5 feet bgs and eleven from a depth of 2.0 to 2.5 feet bgs. Nine out of the 17 soil samples contained DRO above ADEC Table B2 cleanup levels with DRO up to 559 mg/kg. The land farm was tilled June, July, August, and October 2015. |
Grant Lidren |
| 7/29/2016 |
Site Characterization Workplan Approved |
The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the 2016 Groundwater Monitoring Report; Former Newhalen Tank Farm submitted by Weston and dated July 27, 2016. ADEC has no objections to the Work Plan and Weston may proceed. |
Grant Lidren |
| 12/29/2016 |
Site Characterization Report Approved |
On this date, ADEC received the “2016 Groundwater Monitoring Report, Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002” submitted by Weston dated December 29, 2016. MWs: 2, 3, and 5 were analyzed for GRO, DRO, and RRO. Only downgradient monitoring well MW-3 contained contaminant concentrations above cleanup levels with DRO at 7.4 mg/L. The depth to GW throughout the site was 4.15 to 6.62 feet bgs (which is 1 to 2 feet higher than the 2015 sampling event but within historical ranges) flowing to the southeast. |
Grant Lidren |
| 1/11/2017 |
Document, Report, or Work plan Review - other |
Reviewed Newhalen Landfarm Sampling and Maintenance Report. The landfarm was tilled four times in 2016, once in August, twice in September and once in October. Prior to the first event, 1,000 lbs of urea was spread over the landfarm to encourage biodegradation. After the final tilling event, the landfarm was divided into 54 grid segments each 30 feet by 30 feet in size and soil samples were collected for field screening with a PID. Analytical soil samples were collected from 15 locations plus two duplicates at different depths throughout the landfarm. DRO was detected above the cleanup level in 10 of the 17 samples up to 1,130 mg/kg with an average concentration of 291 mg/kg. No other analytes were detected above cleanup levels. |
Bill O'Connell |
| 8/8/2017 |
Site Characterization Workplan Approved |
On this date, ADEC approved the "2017 Groundwater Monitoring Work Plan; Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002" submitted by Weston and dated August 2, 2017 |
Grant Lidren |
| 10/13/2017 |
Document, Report, or Work plan Review - other |
Reviewed Revised 2017 Newhalen Land Farm Operations Work Plan. The landfarm will be tilled in September and October 2017, then sampled using incremental sampling methodology. Two decision units will be sampled in triplicate; the primary landfarm from 0-3 feet bgs then the underlying soil near the groundwater interface from 3-3-5 feet bgs. Trenches will be excavated and random increments collected from varying depths in the trench and submitted as bulk samples in triplicate to the project laboratory for sample processing and analysis for DRO and PAHs. |
Bill O'Connell |
| 5/17/2018 |
Site Characterization Report Approved |
On this date, ADEC reviewed the “2017 Annual Groundwater Monitoring Report, Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002” submitted by Weston dated April 25, 2018. MWs: 2, 3, and 5 were analyzed for GRO, DRO, and RRO. All three MWs contained DRO above cleanup levels ranging from 1.34 mg/L to 2.08 mg/L. The depth to GW throughout the site was 4.34 to 6.89 feet bgs (which is 1 to 2 feet higher than the 2015 sampling event but within historical ranges) flowing to the southeast. |
Grant Lidren |
| 5/17/2018 |
Site Characterization Report Approved |
On this date, Reviewed the “2017 Newhalen Landfarm Operations and Maintenance Summary Letter Report Former Newhalen Tank Farm, Newhalen, Alaska, ADEC File No. 2619.38.002” The landfarm was tilled in September and October 2017, then sampled using multi incremental sampling methodology. Two decision units were sampled in triplicate; the primary landfarm (DU-1) from 0-3 feet bgs then the underlying soil near the groundwater interface from 3-3.5 feet bgs(DU-2). DU-1 95% Chebyshev UCL contained DRO at 317.9 mg/kg, benzo(a)anthracene at 0.465 mg/kg, and benzo[a]pyrene at 0.292 mg/kg. DU-2 95% Chebyshev UCL contained DRO at 404.3 mg/kg. Petroleum odor was noted from DU-2. |
Grant Lidren |
| 6/21/2018 |
Potentially Responsible Party/State Interest Letter |
PRP letter mailed to the City of Newhalen on this date. |
Grant Lidren |
| 12/11/2018 |
Site Characterization Workplan Approved |
On this date, ADEC received 2018 Newhalen Land Farm Operations Work Plan; Newhalen, Alaska, ADEC File No. 2619.38.002 submitted by Weston and dated December 7, 2017. Activities include performing one tilling event, perform increment sampling on DU-1 and DU-2 consisting of 40 sample grids each and analyze samples for DRO, VOC and PAHs |
Grant Lidren |
| 12/11/2018 |
Site Characterization Report Approved |
On this date, ADEC received the 2018 Groundwater Monitoring Work Plan; Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.001 dated December 11, 2017 submitted by Weston. Groundwater monitoring wells MW-2, MW-3 and MW-5 will be sampled and analyzed for DRO, VOCs and PAHs. |
Grant Lidren |
| 3/5/2019 |
Site Characterization Report Approved |
On this date, ADEC reviewed the “2018 Annual Groundwater Monitoring Report, Former Newhalen Tank Farm; Newhalen, Alaska; ADEC File No. 2619.38.002” submitted by Weston dated March 5, 2019. MWs: 2, 3, and 5 were analyzed for: DRO by AK methods; VOCs by 8260; and PAHS by 8270. All three MWs contained naphthalene above cleanup levels between 1.70 ug/L to 36.9 ug/L. Only MW-2 contained 1, 2, 4 – trimethylbenzene and 1-methylnapthalene above cleanup levels at 66.8 ug/L and 16.5J ug/L respectively. No other analytes were detected above cleanup levels. The depth to GW throughout the site was 1.49 to 4.14 feet bgs flowing to the south and southeast. |
Grant Lidren |
| 4/24/2019 |
Site Characterization Report Approved |
On this date, ADEC received the 2018 Newhalen Landfarm Operations and Maintenance Summary, Former Newhalen Tank Farm, Newhalen, Alaska, ADEC File No. 2619.38.002 submitted by Weston dated April 24, 2019. In October 2018, the landfarm was tilled by excavating to a depth of 2.5 feet bgs and flipping the soil. After this, the soil was sampled using incremental sampling methodology. Two decision units were sampled in triplicate; the primary landfarm (DU-1) from 0-3 feet bgs then the underlying soil near the groundwater interface from 3-3.5 feet bgs(DU-2). DU-1 95% Chebyshev UCL contained DRO at 326 mg/kg. DU-2 95% Chebyshev UCL contained DRO at 513 mg/kg. |
Grant Lidren |
| 6/28/2019 |
Update or Other Action |
Site location was updated on this date. Coordinates for this site are used to determine the presence and position of the site on BLM’s ANCSA Conveyed Land web map. |
Rebekah Reams |
| 8/21/2019 |
Document, Report, or Work plan Review - other |
DNA Environmental will be collecting groundwater samples in September 2019. Groundwater samples will be collected from all six MWs and analyzed for DRO, VOCs, and PAHs. |
Grant Lidren |
| 9/12/2019 |
Site Characterization Workplan Approved |
On this date, ADEC received Newhalen Land Farm Operations Work Plan; Newhalen, Alaska, ADEC File No. 2619.38.002 submitted by Weston and dated September 12, 2019. Activities include performing three tilling events, perform increment sampling on DU-1 and DU-2 consisting of 40 sample grids each and analyze samples for DRO, VOC and PAHs |
Grant Lidren |
| 2/10/2020 |
Site Characterization Report Approved |
On this date, ADEC received the 2019 Newhalen Landfarm Operations and Maintenance Summary, Former Newhalen Tank Farm, Newhalen, Alaska, ADEC File No. 2619.38.002 submitted by Weston dated February 17, 2019. In September and October 2019, the landfarm was tilled three times by excavating to a depth of 2.5 feet bgs and flipping the soil. After this, the soil was sampled using incremental sampling methodology. Two decision units were sampled for DRO, PAHs, and VOCs in triplicate; the primary landfarm (DU-1) from 0-3 feet bgs then the underlying soil near the groundwater interface from 3-3.5 feet bgs(DU-2). DU-1 95% Chebyshev UCL contained DRO at 371 mg/kg. DU-2 95% Chebyshev UCL contained DRO at 342 mg/kg. Neither DU-1 nor DU-2 contained VOCs or PAHs above ADEC method two cleanup levels. |
Grant Lidren |
| 4/2/2020 |
Site Characterization Report Approved |
ADEC reviewed the “Report for September 2019 Groundwater Monitoring Event; Former Newhalen Tank Farm, Newhalen, Alaska; ADEC File Number 2619.38” submitted by DNA Environmental dated April 8, 2020. MWs: 1, 2, 3, 5, 7 and 8 were analyzed for: DRO by AK methods; VOCs by 8260; and PAHS by 8270. A hydrocarbon odor was noted at MW2 during sampling. The three historically DRO contaminated MWs: 2,3,and 5 contained DRO above cleanup levels up to 4.02 mg/L. MWs: 2, 3, 5, 7 and 8 contained napthalene above cleanup levels up to 38 ug/L. Only MW-2 contained 1-methylnaphthalene and 1,2,4-TMB above cleanup levels at 23.3 ug/L and 83.8 ug/L respectively. No other analytes were detected above cleanup levels. The depth to GW throughout the site was 1.96 to 4.64 feet bgs flowing to the south and southeast. |
Grant Lidren |
| 9/21/2020 |
Site Characterization Workplan Approved |
On this date, ADEC received the Additional Site Characterization Work Plan, Newhalen Bulk Fuel Storage, Newhalen, Alaska; ADEC File Number 2619.38.001 submitted by DNA and dated September 18, 2020. A a Geoprobe® Optical Image Profiler (OIP) will be used to advanced up to 81 soil borings to a depth of 10 feet bgs beneath the GW interface. Analytical soil samples will be collected from the three suspected most contaminated borings. The purpose of this additional soil investigation is to focus future in-situ remediation using a drill rig or soil mixing for treatment products such as ORC-A and/or PersulfOx. The ultimate goal is to remediate the soil so that it is no longer impacting the shallow groundwater at the site above ADEC Table C Cleanup levels. |
Grant Lidren |
| 8/11/2021 |
Document, Report, or Work plan Review - other |
On 8/11/2021 ADEC reviewed the Additional Site Characterization Report for the Newhalen Bulk Fuel Storage in Newhalen, AK; dated April 16, 2021. The purpose of the additional site characterization work is to better understand the location (vertically and horizontally) of fuel contaminated soil remaining at the site that is resulting in a persistent dissolved-phase petroleum hydrocarbon plume in the shallow unconfined groundwater aquifer so as to design a remedial approach that will reduce or eliminate the plume and the risk posed to human health via the groundwater exposure pathway. DEC commented on the report. |
Daniela Fawcett |
| 7/6/2022 |
Site Characterization Report Approved |
On 7/6/2022 ADEC approved the Additional Site Characterization Report for the Newhalen Bulk Fuel Storage in Newhalen, Alaska, dated June 25, 2022. The purpose of the additional site characterization work is to understand the vertical and horizontal extent of fuel contaminated soil remaining at the site. The soil contamination is resulting in a persistent dissolved-phase petroleum hydrocarbon plume in the shallow unconfined groundwater aquifer. Results from this additional site characterization work will help design a remedial approach to reduce or eliminate the plume and the risk posed to human health via the groundwater exposure pathway. |
Daniela Fawcett |
| 7/12/2023 |
Update or Other Action |
Approved groundwater monitoring for this year based on the 2018 Weston plan. |
Janice Wiegers |
