Site Report: Alaska Airlines - Juneau Cargo Facility

Site Name:	Alaska Airlines - Juneau Cargo Facility
Address:	1915 Alex Holden Way Juneau International Airport, source area ID # 77618, Juneau, AK 99801
File Number:	1513.26.054
Hazard ID:	22996
Status:	Active
Staff:	Alena Voigt, 9072697556 alena.voigt@alaska.gov
Latitude:	58.359161
Longitude:	-134.587581
Horizontal Datum:	WGS84

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.

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

Groundwater monitoring well and soil boring samples indicate residual contamination consists of primarily gasoline and some diesel in soils at 8-12 feet below ground surface in the proximity of the former underground storage tanks (USTs).

Action Information

Action Date	Action	Description	DEC Staff
11/20/1997	Update or Other Action	Cost Recovery Notice letter to Ak Air (owner ID# 35) from Storage Tank Program concerning facility ID#1570 effective 12/1/1997.	Bruce Wanstall
9/1/1998	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 77618 USTs or associated piping are confirmed source of release of GRO, DRO, RRO and BTEX to soil and groundwater. Located adjacent to the former waste oil UST removed in 1993.	Bruce Wanstall
9/1/1998	Site Added to Database		Former Staff
9/15/1998	Leaking Underground Storage Tank Cleanup Initiated - Petroleum	BTEX, GRO and DRO soil and groundwater contamination detected in excavation adjacent to previously removed 500gallon used oil UST. Dispensers, piping and 3 USTs removed and scrapped; 77 cubic yards contaminated soil removed with the tanks was stockpiled and later transported off-site for remediation.	Bruce Wanstall
4/6/1999	Release Investigation	Three soil borings advanced and 4 GW monitoring wells installed using hollow-stem auger drill rig. Wells completed to depths between 10 and 15feet bgs with varying screen depth. 2-inch ID shcedule 40 PVC casing with 0.020-inch slot screen.	Bruce Wanstall
4/8/1999	Release Investigation	Four soil vapor extraction wells, SVE-1 thru 4, were completed to 12 feet bgs. Two soil-gas monitoring points, MP-1 and 2, were completed with two screens within each location. MP-1 has a screen at 5.5feet bgs and 9feet bgs. MP-2 has a screen at 3feet bgs and 7feet bgs.	Bruce Wanstall
7/31/2001	Underground Storage Tank Site Characterization or Assessment	Supplemental Site Characterization Workplan approved for GRO, BTEX, and DRO soil and groundwater contamination.	Bruce Wanstall
10/2/2001	Update or Other Action	Changed Project Manager from Paul Horwath to Bill Janes	Cynthia Pring-Ham
12/12/2001	Update or Other Action	Changed Project Manager from Janes to Bruce Wanstall.	Bill Janes
2/27/2002	Update or Other Action	Verbal approval given to transport IDW soil and water, stored at site indoors in drums, to USR Juneau Facility. IDW water will be delivered to the Juneau Douglas Wastewater Treatment Plant when it thaws.	Bruce Wanstall
5/30/2002	Document, Report, or Work plan Review - other	Review 2001 SRI Report for comment on pending 2002 SRI workplan for the Ak Aircargo blg USTs.	Bruce Wanstall
7/9/2002	Release Investigation	Supplemental RI workplan approval sent by letter and by phone message to RP consultant.	Bruce Wanstall
9/16/2002	Update or Other Action	Approval letter issued for 2002-03 Quarterly Groundwater Sampling Workplan submitted 9/13/02. Continuation of the supplemental release investigation, the sampling plan is designed to delineate the dissolved phase of the GRO/BTEX contaminant plume and changes over the period of the monitoring events.	Bruce Wanstall
9/20/2002	Update or Other Action	Stormwater Pollution Prevention Plan for Juneau International Airport dated 11/01 from maintenance dept. found to have accurate stormdrain locations in areas of the residual plume at the site. Met with E&E staff on-site for well sampling, measuring water levels, and recording drain locations with GPS. Copies of Plan made and forwarded to RP/consultant.	Bruce Wanstall
11/4/2002	Update or Other Action	Teleconference discussion of possible tidal influence affecting potable quality of GW. Saline indicators could support 350 determination for proposed ACLs for soil and GW.	Bruce Wanstall
12/12/2002	Document, Report, or Work plan Review - other	Review of Airport Chevron file. Review of Sept Quarterly GW sampling Report; discussion with RP consultant about taking the lead to develop 18 AAC 350 and 10X rule ACLs. Forwarded link to lower Duck Creek groundwater study.	Bruce Wanstall
12/18/2002	Document, Report, or Work plan Review - other	Draft letter for SRI and QGS reports. Review regs and areawide land use 350 determination for 10 times rule ACLs at Juneau Airport.	Bruce Wanstall
3/3/2003	Update or Other Action	January 2003 Quarterly Groundwater Sampling Report received. Water table elevated for this event; benzene and GRO concentrations lower than previous quarter; concentrations highest near former USTsite.	Bruce Wanstall
5/27/2003	Update or Other Action	April 2003 Quarterly Groundwater Sampling Report received. All quarterly monitoirng event groundwater elevation data indicate groundwater ebbs and flows with levels of rainfall rather than tides. Petroleum concentrations in well samples are greatest near former UST site but may be increasing in downgradient well samples. Continued monitoring for contaminant migration is recommended.	Bruce Wanstall
8/15/2003	Document, Report, or Work plan Review - other	Review of Corrective Action Plan by E&E received 8/14/03. Remedial technologies and alternative solutions evaluated for site specific plan are consistent with earlier discussion with affiliated parties.	Bruce Wanstall
8/21/2003	Leaking Underground Storage Tank Corrective Action Underway	Review of Corrective Action Plan remedial alternatives. Department approval for Pilot Test sent by email.	Bruce Wanstall
2/9/2004	Update or Other Action	Reached Dorothy Saunders at EPA inquiring into permit needs for subsurface UIC (Class V). She will contact the DEC if permit is requested.	Bruce Wanstall
2/17/2004	Leaking Underground Storage Tank Corrective Action Underway	Revised Corrective Action Plan approved. Implementation scheduled for Spring 2004. Approval letter sent with recommendations to analyze GW for bioremedial tracking parameters.	Bruce Wanstall
4/25/2004	Leaking Underground Storage Tank Corrective Action Underway	Ozone sparging unit is installed in the subsurface at the site and operating.	Bruce Wanstall
5/18/2004	Long Term Monitoring Established	Groundwater Monitoring Plan approved.	Bruce Wanstall
5/19/2004	Leaking Underground Storage Tank Corrective Action Underway	Approval to transport IDW petroleum contaminated soil off-site for remediation sent by fax and mail.	Bruce Wanstall
7/26/2004	Update or Other Action	Results of the June groundwater monitoring event were received for review. Concentrations of dissolved GRO in groundwater exceed cleanup level in 3 wells; concentrations of benzene exceed cleanup level in 5 wells; elevated dissoved oxygen compared with previous sampling events is attributed to ozone sparging unit remedial operation.	Bruce Wanstall
8/16/2004	Update or Other Action	Cost recovery memo sent to DOL approving current site log package.	Bruce Wanstall
9/30/2004	Update or Other Action	Cost recovery check for $946.44 received from Alaska Airlines to cover ADEC FY04 expense for cleanup project oversight staff.	Bruce Wanstall
4/11/2005	Update or Other Action	Project management FY 05 cost recovery check for $302.15 received from Alaska Airlines 3/15/05.	Bruce Wanstall
4/10/2006	Update or Other Action	Review monitoring well data for the June and December 2005 sampling events; change to Spring/ Fall sampling schedule is requested.	Bruce Wanstall
7/5/2006	Document, Report, or Work plan Review - other	Request semi-annual sampling event schedule from URS; review 2005 sampling data Report.	Bruce Wanstall
2/9/2007	Exposure Tracking Model Ranking	Baseline ranking for the former UST sources has been completed and locked in.	Bruce Wanstall
3/15/2007	Update or Other Action	Review the 2006 semi-annual groundwater monitoring report and requested change to annual sampling. ADEC agreement to change from semi-annual to annual sampling during the summer seasonal period was sent by letter to Alaska Airlines; copied to consultant URS.	Bruce Wanstall
5/1/2007	Update or Other Action	$399.82 Check received for project management costs from Alaska Airlines.	Bruce Wanstall
5/7/2008	Update or Other Action	ADEC requested a 2007 GMR.	Bruce Wanstall
5/14/2008	Update or Other Action	ADEC reviewed and approved data from the 2007 Groundwater Monitoring Report by URS. As expected, the effectiveness of the active remediation is limited by low oxygen in the phreatic (saturated) subsurface zone. The goal of reversing the expansion of the gasoline plume in groundwater, however, continues to be met.	Bruce Wanstall
4/16/2009	Document, Report, or Work plan Review - other	In accordance with quality assurance criteria ADEC has reviewed and approves the data in the 2008 Groundwater Monitoring Report by URS.	Bruce Wanstall
11/19/2009	Document, Report, or Work plan Review - other	Alaska Air Cargo Facility at the JIA; project manager waiver of the requirement for laboratory report case narrative of data quality variances is necessary to accept the Test America URS 2009 GMR laboratory report for ADEC quality assurance criteria. While LIMS notation in the 2009 Report for sample dilution may be acceptable, an analysis-specific narrative signed by the laboratory project manager or analyst is normally required when surrogate recovery is outside limits.	Bruce Wanstall
11/19/2009	Document, Report, or Work plan Review - other	2009 Annual Ground Water Monitoring Report of the Alaska Air Cargo Facility at the JIA; a URS chemist provided a case narrative discussion of data quality variances in the Test America laboratory report. The discussion is adequate for ADEC quality assurance criteria. While LIMS notation in the 2009 Report for sample dilution may be acceptable, an analysis-specific narrative signed by the laboratory project manager or analyst is advisable when surrogate recoveries are outside limits. In this report, another surrogate was within range that more closely approximates the contaminants of concern for this site (gasoline).	Bruce Wanstall
12/2/2009	Document, Report, or Work plan Review - other	DEC approves the URS 2009 Ground Water Monitoring Report data and recommendations to continue active treatment of a residual subsurface gasoline contaminated ground water and annual monitoring well sampling during the summer season. Annual sampling data dating back to 2005 when active treatment began indicate that GRO and BTEX concentrations in ground water have declined and the volume of the contaminant plume is reduced.	Bruce Wanstall
1/7/2011	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77618 underground storage tanks - fuel. As a result of active and ongoing remediation at the site BTEX compounds in ground water no longer exceed Table C cleanup levels; only GRO and DRO exceed Table C cleanup levels near maintenance shop on the south side of the building.	Bruce Wanstall
12/14/2011	Document, Report, or Work plan Review - other	DEC approves the URS 2011 Groundwater Monitoring Report that documents annual monitoring of petroleum contaminated groundwater that resulted from leakage underground storage tank (UST) systems at the GSE/ Cargo Building. The groundwater sampling is an annual event in the Revised Corrective Action Plan approved by DEC in 2004 for active remediation at the site. In accordance with 18 AAC 78.090 and 18 AAC 78.230, qualified person(s) used data collection methods consistent with DEC methodology in the DEC-approved Corrective Action Plan for long term monitoring of groundwater. The data meet field and laboratory report quality assurance criteria in Contaminated Sites Program guidance documents and the UST Procedures Manual. The Report documents the results of current and historical results of field and laboratory investigation into petroleum release from regulated UST systems as required by 18 AAC 78.230 - 18 AAC 78.280 and 18 AAC 78.600 - 18 AAC 78.625.	Bruce Wanstall
4/25/2012	Document, Report, or Work plan Review - other	DEC approves the corrective action Remediation System Installation Plan and the Long Term Monitoring Plan by URS for the Alaska Air GSE/Cargo Facility at the JIA. The air sparging/soil vapor extraction system will continue active remediation of groundwater contamination. The schedule for the AS-SVE system installation is after the annual monitoring event in May 2012. The proposed Long Term Monitoring Plan lists GRO and BTEX as COCs and the September 2009 18 AAC 75.341 Table C cleanup levels for those COCs for unrestricted land-use as cleanup goals. The LTM appropriately suggests that annual sampling be discontinued for wells MW-12 and MW-15 and sampling resume in wells MW-10 and MW-11 in order to achieve more upper-plume delineation. The LTM appropriately suggests the use of a submersible sampling pump for well purging and sample collection and annual reporting of the sampling results.	Bruce Wanstall
10/29/2013	Update or Other Action	DEC sent a request by email to Alaska Airlines to provide current information regarding URS installing the new remediation system at the Juneau Airport site and information regarding the outcome of annual sampling of monitor wells in accordance with approved revisions to the long term plan.	Bruce Wanstall
10/29/2013	Update or Other Action	DEC sent a request by email to Alaska Airlines to provide current information regarding URS installing the new remediation system at the Juneau Airport site and information regarding the outcome of annual sampling of monitor wells in accordance with approved revisions to the long term plan.	Bruce Wanstall
11/8/2013	Update or Other Action	URS installed all of the treatment wells and wired the remediation system in fall 2012 but installation of the lateral lines between the treatment system and the treatment wells is held up until fall 2013 at best. Regardless of the outcome of the remedial system installation, URS plans to collect samples from all the wells to update and maintain the long term monitoring Plan.	Bruce Wanstall
3/6/2014	Update or Other Action	DEC requested that URS provide an update on the remedial treatment system installation and well sampling.	Bruce Wanstall
4/2/2014	Update or Other Action	DEC requested URS provide DEC with an update on progress completing the sampling report for 2013 groundwater monitoring and the status for getting the treatment system up and running again.	Bruce Wanstall
4/4/2014	Document, Report, or Work plan Review - other	DEC evaluated and by email approved a URS plan to complete installation the groundwater treatment system in the next few months and then sample all wells on-site and submit a report on overall site conditions.	Bruce Wanstall
5/20/2014	Update or Other Action	URS provided DEC, CBJ and operator Delta Western with an update on completing installation of the groundwater remediation system at the Alaska Air Cargo Building. After installation of the new remedial system, URS plans to collect samples from all the wells to update and maintain the Long Term Monitoring Plan. The most recent well monitoring was in summer 2011 by URS.	Bruce Wanstall
7/21/2014	Update or Other Action	URS submitted to DEC electronic and hard copy of a 2014 groundwater sampling report that will serve as a baseline for the AS/SVE remediation system being installed at the Juneau Airport facility site. A system installation report will be submitted after the system is fully operational.	Bruce Wanstall
9/15/2014	Document, Report, or Work plan Review - other	DEC evaluated and approved, by letter sent by electronic and regular mail, Groundwater Monitoring Report, Alaska GSE/Cargo Facility, Juneau International Airport (Report), dated July, 2014. URS Corporation (URS) completed the Report documenting groundwater monitoring performed in accordance with the Revised Corrective Action Plan for the site, dated January 8, 2004, and the Groundwater Monitoring Plan (GMP), dated May 18, 2004. The objective of the groundwater monitoring program is to generate data for trend analysis of the groundwater contaminant plume in excess of cleanup levels and to assess effectiveness of active remediation at the site. Since 2005, petroleum concentrations in the contaminant plume stopped increasing and have declined as a result of active remediation at the UST release source area. The rate of decline has been less than was anticipated, perhaps due to anoxic conditions (low dissolved oxygen) in the contaminant plume. The Report recommends collecting samples in spring 2015 from wells MW-1, -2, -3, -4, -8, -9, -10, and -14 for COCs GRO and BTEX compounds chemical analyses to assess effectiveness of the newly installed remediation system. The Report also recommends continuing the GMP at the current annual interval until cleanup levels are met.	Bruce Wanstall
1/9/2015	Document, Report, or Work plan Review - other	DEC approved by letter the 2014 Air Sparge/Soil Vapor Extraction System Installation Report by URS regarding remedial treatment of groundwater contamination at the AK Air Juneau Cargo Building LUST facility. URS installed two soil vapor extraction well points, and three air sparge well points using direct-push drilling methods at locations based on the distribution of soil and groundwater contaminants previously identified during historical groundwater monitoring events. Operation of the current AS/SVE treatment system should effectively mitigate groundwater contamination by treating the residual soil contamination in the source.	Bruce Wanstall
10/8/2015	Update or Other Action	DEC received by regular mail a hard copy of Groundwater Monitoring Report Alaska Airlines GSE/Cargo Facility Juneau International Airport Juneau Alaska prepared by AECOM Anchorage in September 2015 as AECOM Project No. 60437490. The groundwater sampling event is scheduled in the corrective action plan and results will evaluate effectiveness of a new air sparge/soil vapor extraction (AS/SVE) system installed in 2014 for Alaska Airlines by URS as Project No. 26219627.	Bruce Wanstall
6/1/2016	Document, Report, or Work plan Review - other	DEC approved by letter and email to Alaska Airlines the sample monitoring report for the cargo facility at the Juneau International Airport submitted by AECOM Inc.	Bruce Wanstall
8/18/2016	Document, Report, or Work plan Review - other	DEC reviewed the Alaska Airlines - Juneau Cargo Building LUST annual site sampling report by AECOM. An air sparge and soil vapor extraction system was installed at the Site in 2014. Report approval letter was sent to Alaska Airlines by regular and electronic mail recommending continued annual monitoring.	Bruce Wanstall
12/27/2017	Document, Report, or Work plan Review - other	Reviewed and approved SLR's December 2017 Groundwater Monitoring and Operation & Maintenance Report for Alaska Airlines - Juneau Cargo Facility with June 2017 groundwater sampling data. ADEC will evaluate site for closure.	Amy Rodman
6/15/2018	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77618 underground storage tanks - fuel.	Amy Rodman
2/6/2019	Site Characterization Report Approved	ADEC reviewed and approved the “Groundwater Monitoring and Operation & Maintenance Report: Alaska Airlines GSE/Cargo Facility Juneau, Alaska” (report) dated December 2018 for the Alaska Airlines - Juneau Cargo Facility site in Juneau, AK. The report was submitted via email on December 21, 2018 by SLR International. The described field effort was conducted in June 2018 and generally consisted of well survey data collection, groundwater monitoring well sampling for laboratory analysis, and air sparging/soil vapor extraction (AS/SVE) system maintenance. Eight groundwater monitoring wells were sampled via low-flow sampling method and analyzed for gasoline range organics (GRO), benzene, toluene, ethylbenzene, and total xylenes (BTEX) concentration. GRO was confirmed above Table C groundwater cleanup levels in the two source area wells (MW-4, 2.24 mg/L and MW-2, 3.06 mg/L). Benzene was confirmed above Table C groundwater cleanup levels in MW-2 at 0.00507 mg/L. Ethylbenzene and total xylenes were confirmed above Table C groundwater cleanup levels at 0.174 mg/L and 0.233 mg/L. Inspection and maintenance was conducted on the AS/SVE system. Well parameters were also measured. Depth to groundwater varied between eight and ten feet below ground surface. The overall trend of contamination is steady or decreasing in all eight remaining groundwater monitoring wells.	Amy Rodman
4/1/2019	Site Characterization Workplan Approved	The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) reviewed and approved the “Site Closure Work Plan: Alaska Airlines GSE/Cargo Facility Juneau, Alaska” (Work Plan) dated March 2019 for the Alaska Airlines - Juneau Cargo Facility site in Juneau, AK. The report was submitted via email on March 13, 2019 by SLR International. The Work Plan generally consists of shutting down the air sparging/soil vapor extraction (AS/SVE) system, sample groundwater monitoring wells biannually post-AS/SVE system shut down, and summarizing site data. Shutdown of the AS/SVE system is scheduled for May 2019 and the first of two biannual groundwater monitoring well sampling events is scheduled for June 2019. The second groundwater sampling event is scheduled for December. Eight groundwater monitoring wells will be sampled and analyzed for diesel range organics (DRO), gasoline range organics (GRO), and benzene, toluene, ethylbenzene, total xylenes (BTEX). Groundwater sampling will continue to be conducted according to the ADEC-approved May 2004 Groundwater Monitoring Plan.	Amy Rodman
2/10/2020	Site Characterization Report Approved	The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) reviewed and approved the “Groundwater Monitoring and Operation & Maintenance Report: Alaska Airlines GSE/Cargo Facility Juneau, Alaska” (report) dated February 202 for the Alaska Airlines - Juneau Cargo Facility site in Juneau, AK. The report was submitted via email on February 4, 2020 by SLR International. The described field effort was conducted in May, June, and December 2019 and generally consisted of shutting down the air sparging/soil vapor extraction (AS/SVE) system, conducting well survey data collection, and two groundwater monitoring well sampling events in 2019 for laboratory analysis. WP for future GW monitoring due March 16, 2020.	Amy Rodman
2/27/2020	Document, Report, or Work plan Review - other	Reviewed the 2020 Alaska Airlines JNU GSE/Cargo Facility Groundwater Sampling Work Plan, dated February 21, 2020. Planned activities generally include water sampling from 4 monitoring wells (MW2, MW4, MW8, and MW9). All water samples are planned for analysis of GRO, DRO, and BTEX. This work plan was approved with the following conditions: (1) If the full suite VOCs have not been sampled in the past, please sample for the entire VOC list under 8260. If VOCs have been sampled and BTEX is the only concern, please still use 8260 for BTEX; and (2) Please use a submersible pump, as opposed to a peristaltic pump during the field effort.	Joshua Barsis
3/1/2021	Document, Report, or Work plan Review - other	2020 Groundwater Monitoring Report received. An ADEC comments letter was issued on April 1, 2021. The RP provided a response to comments on April 16, 2021. An amended report was summitted to ADEC for approval on May 3, 2021.	Julie Fix
5/3/2021	Document, Report, or Work plan Review - other	Received request to use the "2020 Alaska Airlines JNU GSE/Cargo Facility Groundwater Sampling Work Plan" for 2021 groundwater monitoring activities. ADEC comments table and letter regarding 2020 work plan re-use issued on May 11, 2021. Amended workplan and response to comments received on May 25, 2021.	Julie Fix
5/5/2021	Document, Report, or Work plan Review - other	The “2020 Groundwater Monitoring Report” is approved. The report describes field activities that included groundwater sample collection at four groundwater monitoring wells on June 30, 2020 and November 24, 2020. Groundwater monitoring wells MW-02, MW-04, MW-08, and MW-09 were sampled for DRO, GRO, BTEX, and VOCs. Contaminant exceedances above the Groundwater Cleanup Levels were detected at all four monitoring wells at both sampling events. Additionally, four new COCs were identified above cleanup levels. DRO was detected at MW-02, MW-04, MW-08, and MW-09 above cleanup levels. VOCs were sampled for the first time at this site during both 2020 sampling events. Ethylbenzene was detected above cleanup levels at MW-04 and naphthalene at MW-02, MW-04, MW-08, and MW-09. 1,2,3-trichloropropane was detected above cleanup levels at MW-02, 1,2,4-trimethylbenzene at MW-02 and MW-04, and 1,3,5-trimethylbenzene at MW-02 and MW-04. ADEC recommended that Alaska Airlines continue to monitor DRO, BTEX, and VOC groundwater concentrations at MW-02, MW-04, MW-08, MW-09, and MW-15. ADEC also requested additional site characterization to delineate the nature and extent of naphthalene, 1,2,3-trichloropropane, 1,2,4-trimethylbenzene, and 1,3,5-trimethylbenzene in the groundwater at this site. The amended report incorporated all of ADEC’s comments and recommendations.	Julie Fix
5/24/2021	Document, Report, or Work plan Review - other	2021 Groundwater Sampling Work Plan received. The work plan proposes collecting groundwater samples from MW-01, MW-03, MW-10, MW-13, and MW-14 will be analyzed for volatile organic compounds (VOCs) in an effort to delineate the extent of 1,2,3-trichloropropane, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, and naphthalene. Groundwater samples collected from MW-02, MW-04, MW-08, MW-09, and MW-15 will be analyzed for gasoline range organics (GRO), diesel range organics (DRO), and benzene, toluene, ethylbenzene, and xylenes (BTEX).	Julie Fix
6/22/2021	Site Characterization Workplan Approved	2021 Groundwater Sampling Work Plan approved and sent to RP via email. Additional revisions included in workplan: Method 8260 SIM will be used to achieve a lower limit of detection when analyzing for 1,2,3-trichloropropane. All other comments provided by the Department, including representative DNAPL sampling methodology, were accepted and are included in the updated workplan (email chain merged with most recent revision). The site activities described in the work plan are scheduled to commence on July 5, 2021.	Julie Fix
10/20/2021	Document, Report, or Work plan Review - other	"2021 Alaska Airlines Juneau Cargo Facility Groundwater Report" received on this date. An amended report was received on 12/3/2021. Additional comments sent to RP and consultant on 2/7/2022.	Julie Fix
2/24/2022	Document, Report, or Work plan Review - other	The “2021 Groundwater Monitoring Report” was approved on this date. Field work occurred from July 6-8, 2021. The condition of the monitoring wells was evaluated, and the top of the casing was trimmed at several monitoring wells. Groundwater samples were collected from monitoring wells MW-01 through MW-04, MW-08 through MW-10, and MW-13 through MW-15. MW-16 could not be located. MW-02 had exceedances of DRO at 2.23 mg/L, 1,3,5-TMB at 0.075 mg/L, and 1,2,4-TMB at 0.0659 mg/L. MW-04 had exceedances of DRO at 2.37 mg/L, ethylbenzene at 0.0671 mg/L, 1,2,4-TMB at 0.378 mg/L (est. conc.), 1,3,5-TMB at 0.0798 mg/L, and naphthalene at 0.0379 mg/L. MW-08 had exceedances of DRO at 3.3 mg/L, ethylbenzene at 0.0232 mg/L, 1,2,4-TMB at 0.381 mg/L (est. conc.), 1,3,5-TMB at 0.146 mg/L, and naphthalene at 0.0275 mg/L. MW-09 had exceedances of DRO at 1.83 mg/L and naphthalene at 0.00603 mg/L. Analytical results for MW-01, MW-03, MW-13, MW-14, and MW-15 were either non-detect or below cleanup levels. The next sampling event will take place in July 2022. Groundwater samples will be collected and analyzed for DRO and VOCs. GRO concentrations have consistently measured as non-detect or well below the ADEC cleanup level for two or more sampling events at each monitoring well. GRO analysis will be removed from the analyte list.	Julie Fix
5/19/2022	Document, Report, or Work plan Review - other	The "2022 Groundwater Sampling Work Plan" was received on this date and is currently under review.	Julie Fix
6/30/2022	Site Characterization Workplan Approved	The "2022 Groundwater Sampling Work Plan" was approved on this date. The work plan proposes collecting groundwater samples from MW-02, MW-03, MW-04, MW-08, MW-09, MW-10, MW-14, and MW-15. The samples will be analyzed for DRO, BTEX, 1,2,4-TMB, 1,3,5-TMB, and naphthalene. Additionally, an attempt will be made to locate and document the condition of MW-16.	Julie Fix
10/31/2022	Document, Report, or Work plan Review - other	The "2022 Groundwater Monitoring Report" was received on this date.	Julie Fix
4/14/2023	Site Characterization Report Approved	The "2022 Groundwater Monitoring Report" was approved on this date. Groundwater samples were collected from monitoring wells MW-02, MW-03, MW-04, MW-08, MW-09, MW-10, MW-14, and MW-15. Samples were analyzed for DRO, BTEX, 1,2,4-TMB, 1,3,5-TMB, and naphthalene. Exceedances of DRO, 1,2,4-TMB, and naphthalene were detected in MW-08 and MW-09. Additionally, 1,3,5-TMB exceeded cleanup levels in MW-09. MW-04 was not sampled due to insufficient volume of water in the well. A stable and/or decreasing trend must be sufficiently demonstrated in monitoring wells MW-02, MW-04, MW-08, and MW-09 before this site can be considered for closure.	Julie Fix
6/7/2023	Document, Report, or Work plan Review - other	The draft "2023 Alaska Airlines JNU GSE/Cargo Facility Well Replacement and Groundwater Monitoring Work Plan" was received on this date.	Julie Fix
6/16/2023	Site Characterization Workplan Approved	The "2023 Alaska Airlines JNU GSE/Cargo Facility Well Replacement and Groundwater Monitoring Work Plan" was approved on this date. The work plan proposes decommissioning MW-04 and advancing a new soil boring adjacent to MW-04. This well will be completed as a groundwater monitoring well (MW-04R). Soil and groundwater samples will be collected from this boring and analyzed for DRO, BTEX, 1,2,4-TMB, 1,3,5-TMB, and naphthalene. Additional groundwater samples will be collected from monitoring wells MW-02 through MW-03, MW-08 through MW-10, MW-14, and MW-15. Samples will be analyzed for DRO, BTEX, 1,2,4-TMB, 1,3,5-TMB, and naphthalene.	Julie Fix

Action Date

Action

Description

DEC Staff

11/20/1997

Update or Other Action

Cost Recovery Notice letter to Ak Air (owner ID# 35) from Storage Tank Program concerning facility ID#1570 effective 12/1/1997.

Bruce Wanstall

9/1/1998

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 77618 USTs or associated piping are confirmed source of release of GRO, DRO, RRO and BTEX to soil and groundwater. Located adjacent to the former waste oil UST removed in 1993.

Bruce Wanstall

9/1/1998

Site Added to Database

Former Staff

9/15/1998

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

BTEX, GRO and DRO soil and groundwater contamination detected in excavation adjacent to previously removed 500gallon used oil UST. Dispensers, piping and 3 USTs removed and scrapped; 77 cubic yards contaminated soil removed with the tanks was stockpiled and later transported off-site for remediation.

Bruce Wanstall

4/6/1999

Release Investigation

Three soil borings advanced and 4 GW monitoring wells installed using hollow-stem auger drill rig. Wells completed to depths between 10 and 15feet bgs with varying screen depth. 2-inch ID shcedule 40 PVC casing with 0.020-inch slot screen.

Bruce Wanstall

4/8/1999

Release Investigation

Four soil vapor extraction wells, SVE-1 thru 4, were completed to 12 feet bgs. Two soil-gas monitoring points, MP-1 and 2, were completed with two screens within each location. MP-1 has a screen at 5.5feet bgs and 9feet bgs. MP-2 has a screen at 3feet bgs and 7feet bgs.

Bruce Wanstall

7/31/2001

Underground Storage Tank Site Characterization or Assessment

Supplemental Site Characterization Workplan approved for GRO, BTEX, and DRO soil and groundwater contamination.

Bruce Wanstall

10/2/2001

Update or Other Action

Changed Project Manager from Paul Horwath to Bill Janes

Cynthia Pring-Ham

12/12/2001

Update or Other Action

Changed Project Manager from Janes to Bruce Wanstall.

Bill Janes

2/27/2002

Update or Other Action

Verbal approval given to transport IDW soil and water, stored at site indoors in drums, to USR Juneau Facility. IDW water will be delivered to the Juneau Douglas Wastewater Treatment Plant when it thaws.

Bruce Wanstall

5/30/2002

Document, Report, or Work plan Review - other

Review 2001 SRI Report for comment on pending 2002 SRI workplan for the Ak Aircargo blg USTs.

Bruce Wanstall

7/9/2002

Release Investigation

Supplemental RI workplan approval sent by letter and by phone message to RP consultant.

Bruce Wanstall

9/16/2002

Update or Other Action

Approval letter issued for 2002-03 Quarterly Groundwater Sampling Workplan submitted 9/13/02. Continuation of the supplemental release investigation, the sampling plan is designed to delineate the dissolved phase of the GRO/BTEX contaminant plume and changes over the period of the monitoring events.

Bruce Wanstall

9/20/2002

Update or Other Action

Stormwater Pollution Prevention Plan for Juneau International Airport dated 11/01 from maintenance dept. found to have accurate stormdrain locations in areas of the residual plume at the site. Met with E&E staff on-site for well sampling, measuring water levels, and recording drain locations with GPS. Copies of Plan made and forwarded to RP/consultant.

Bruce Wanstall

11/4/2002

Update or Other Action

Teleconference discussion of possible tidal influence affecting potable quality of GW. Saline indicators could support 350 determination for proposed ACLs for soil and GW.

Bruce Wanstall

12/12/2002

Document, Report, or Work plan Review - other

Review of Airport Chevron file. Review of Sept Quarterly GW sampling Report; discussion with RP consultant about taking the lead to develop 18 AAC 350 and 10X rule ACLs. Forwarded link to lower Duck Creek groundwater study.

Bruce Wanstall

12/18/2002

Document, Report, or Work plan Review - other

Draft letter for SRI and QGS reports. Review regs and areawide land use 350 determination for 10 times rule ACLs at Juneau Airport.

Bruce Wanstall

3/3/2003

Update or Other Action

January 2003 Quarterly Groundwater Sampling Report received. Water table elevated for this event; benzene and GRO concentrations lower than previous quarter; concentrations highest near former USTsite.

Bruce Wanstall

5/27/2003

Update or Other Action

April 2003 Quarterly Groundwater Sampling Report received. All quarterly monitoirng event groundwater elevation data indicate groundwater ebbs and flows with levels of rainfall rather than tides. Petroleum concentrations in well samples are greatest near former UST site but may be increasing in downgradient well samples. Continued monitoring for contaminant migration is recommended.

Bruce Wanstall

8/15/2003

Document, Report, or Work plan Review - other

Review of Corrective Action Plan by E&E received 8/14/03. Remedial technologies and alternative solutions evaluated for site specific plan are consistent with earlier discussion with affiliated parties.

Bruce Wanstall

8/21/2003

Leaking Underground Storage Tank Corrective Action Underway

Review of Corrective Action Plan remedial alternatives. Department approval for Pilot Test sent by email.

Bruce Wanstall

2/9/2004

Update or Other Action

Reached Dorothy Saunders at EPA inquiring into permit needs for subsurface UIC (Class V). She will contact the DEC if permit is requested.

Bruce Wanstall

2/17/2004

Leaking Underground Storage Tank Corrective Action Underway

Revised Corrective Action Plan approved. Implementation scheduled for Spring 2004. Approval letter sent with recommendations to analyze GW for bioremedial tracking parameters.

Bruce Wanstall

4/25/2004

Leaking Underground Storage Tank Corrective Action Underway

Ozone sparging unit is installed in the subsurface at the site and operating.

Bruce Wanstall

5/18/2004

Long Term Monitoring Established

Groundwater Monitoring Plan approved.

Bruce Wanstall

5/19/2004

Leaking Underground Storage Tank Corrective Action Underway

Approval to transport IDW petroleum contaminated soil off-site for remediation sent by fax and mail.

Bruce Wanstall

7/26/2004

Update or Other Action

Results of the June groundwater monitoring event were received for review. Concentrations of dissolved GRO in groundwater exceed cleanup level in 3 wells; concentrations of benzene exceed cleanup level in 5 wells; elevated dissoved oxygen compared with previous sampling events is attributed to ozone sparging unit remedial operation.

Bruce Wanstall

8/16/2004

Update or Other Action

Cost recovery memo sent to DOL approving current site log package.

Bruce Wanstall

9/30/2004

Update or Other Action

Cost recovery check for $946.44 received from Alaska Airlines to cover ADEC FY04 expense for cleanup project oversight staff.

Bruce Wanstall

4/11/2005

Update or Other Action

Project management FY 05 cost recovery check for $302.15 received from Alaska Airlines 3/15/05.

Bruce Wanstall

4/10/2006

Update or Other Action

Review monitoring well data for the June and December 2005 sampling events; change to Spring/ Fall sampling schedule is requested.

Bruce Wanstall

7/5/2006

Document, Report, or Work plan Review - other

Request semi-annual sampling event schedule from URS; review 2005 sampling data Report.

Bruce Wanstall

2/9/2007

Exposure Tracking Model Ranking

Baseline ranking for the former UST sources has been completed and locked in.

Bruce Wanstall

3/15/2007

Update or Other Action

Review the 2006 semi-annual groundwater monitoring report and requested change to annual sampling. ADEC agreement to change from semi-annual to annual sampling during the summer seasonal period was sent by letter to Alaska Airlines; copied to consultant URS.

Bruce Wanstall

5/1/2007

Update or Other Action

$399.82 Check received for project management costs from Alaska Airlines.

Bruce Wanstall

5/7/2008

Update or Other Action

ADEC requested a 2007 GMR.

Bruce Wanstall

5/14/2008

Update or Other Action

ADEC reviewed and approved data from the 2007 Groundwater Monitoring Report by URS. As expected, the effectiveness of the active remediation is limited by low oxygen in the phreatic (saturated) subsurface zone. The goal of reversing the expansion of the gasoline plume in groundwater, however, continues to be met.

Bruce Wanstall

4/16/2009

Document, Report, or Work plan Review - other

In accordance with quality assurance criteria ADEC has reviewed and approves the data in the 2008 Groundwater Monitoring Report by URS.

Bruce Wanstall

11/19/2009

Document, Report, or Work plan Review - other

Alaska Air Cargo Facility at the JIA; project manager waiver of the requirement for laboratory report case narrative of data quality variances is necessary to accept the Test America URS 2009 GMR laboratory report for ADEC quality assurance criteria. While LIMS notation in the 2009 Report for sample dilution may be acceptable, an analysis-specific narrative signed by the laboratory project manager or analyst is normally required when surrogate recovery is outside limits.

Bruce Wanstall

11/19/2009

Document, Report, or Work plan Review - other

2009 Annual Ground Water Monitoring Report of the Alaska Air Cargo Facility at the JIA; a URS chemist provided a case narrative discussion of data quality variances in the Test America laboratory report. The discussion is adequate for ADEC quality assurance criteria. While LIMS notation in the 2009 Report for sample dilution may be acceptable, an analysis-specific narrative signed by the laboratory project manager or analyst is advisable when surrogate recoveries are outside limits. In this report, another surrogate was within range that more closely approximates the contaminants of concern for this site (gasoline).

Bruce Wanstall

12/2/2009

Document, Report, or Work plan Review - other

DEC approves the URS 2009 Ground Water Monitoring Report data and recommendations to continue active treatment of a residual subsurface gasoline contaminated ground water and annual monitoring well sampling during the summer season. Annual sampling data dating back to 2005 when active treatment began indicate that GRO and BTEX concentrations in ground water have declined and the volume of the contaminant plume is reduced.

Bruce Wanstall

1/7/2011

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77618 underground storage tanks - fuel. As a result of active and ongoing remediation at the site BTEX compounds in ground water no longer exceed Table C cleanup levels; only GRO and DRO exceed Table C cleanup levels near maintenance shop on the south side of the building.

Bruce Wanstall

12/14/2011

Document, Report, or Work plan Review - other

DEC approves the URS 2011 Groundwater Monitoring Report that documents annual monitoring of petroleum contaminated groundwater that resulted from leakage underground storage tank (UST) systems at the GSE/ Cargo Building. The groundwater sampling is an annual event in the Revised Corrective Action Plan approved by DEC in 2004 for active remediation at the site. In accordance with 18 AAC 78.090 and 18 AAC 78.230, qualified person(s) used data collection methods consistent with DEC methodology in the DEC-approved Corrective Action Plan for long term monitoring of groundwater. The data meet field and laboratory report quality assurance criteria in Contaminated Sites Program guidance documents and the UST Procedures Manual. The Report documents the results of current and historical results of field and laboratory investigation into petroleum release from regulated UST systems as required by 18 AAC 78.230 - 18 AAC 78.280 and 18 AAC 78.600 - 18 AAC 78.625.

Bruce Wanstall

4/25/2012

Document, Report, or Work plan Review - other

DEC approves the corrective action Remediation System Installation Plan and the Long Term Monitoring Plan by URS for the Alaska Air GSE/Cargo Facility at the JIA. The air sparging/soil vapor extraction system will continue active remediation of groundwater contamination. The schedule for the AS-SVE system installation is after the annual monitoring event in May 2012. The proposed Long Term Monitoring Plan lists GRO and BTEX as COCs and the September 2009 18 AAC 75.341 Table C cleanup levels for those COCs for unrestricted land-use as cleanup goals. The LTM appropriately suggests that annual sampling be discontinued for wells MW-12 and MW-15 and sampling resume in wells MW-10 and MW-11 in order to achieve more upper-plume delineation. The LTM appropriately suggests the use of a submersible sampling pump for well purging and sample collection and annual reporting of the sampling results.

Bruce Wanstall

10/29/2013

Update or Other Action

DEC sent a request by email to Alaska Airlines to provide current information regarding URS installing the new remediation system at the Juneau Airport site and information regarding the outcome of annual sampling of monitor wells in accordance with approved revisions to the long term plan.

Bruce Wanstall

10/29/2013

Update or Other Action

Bruce Wanstall

11/8/2013

Update or Other Action

URS installed all of the treatment wells and wired the remediation system in fall 2012 but installation of the lateral lines between the treatment system and the treatment wells is held up until fall 2013 at best. Regardless of the outcome of the remedial system installation, URS plans to collect samples from all the wells to update and maintain the long term monitoring Plan.

Bruce Wanstall

3/6/2014

Update or Other Action

DEC requested that URS provide an update on the remedial treatment system installation and well sampling.

Bruce Wanstall

4/2/2014

Update or Other Action

DEC requested URS provide DEC with an update on progress completing the sampling report for 2013 groundwater monitoring and the status for getting the treatment system up and running again.

Bruce Wanstall

4/4/2014

Document, Report, or Work plan Review - other

DEC evaluated and by email approved a URS plan to complete installation the groundwater treatment system in the next few months and then sample all wells on-site and submit a report on overall site conditions.

Bruce Wanstall

5/20/2014

Update or Other Action

URS provided DEC, CBJ and operator Delta Western with an update on completing installation of the groundwater remediation system at the Alaska Air Cargo Building. After installation of the new remedial system, URS plans to collect samples from all the wells to update and maintain the Long Term Monitoring Plan. The most recent well monitoring was in summer 2011 by URS.

Bruce Wanstall

7/21/2014

Update or Other Action

URS submitted to DEC electronic and hard copy of a 2014 groundwater sampling report that will serve as a baseline for the AS/SVE remediation system being installed at the Juneau Airport facility site. A system installation report will be submitted after the system is fully operational.

Bruce Wanstall

9/15/2014

Document, Report, or Work plan Review - other

DEC evaluated and approved, by letter sent by electronic and regular mail, Groundwater Monitoring Report, Alaska GSE/Cargo Facility, Juneau International Airport (Report), dated July, 2014. URS Corporation (URS) completed the Report documenting groundwater monitoring performed in accordance with the Revised Corrective Action Plan for the site, dated January 8, 2004, and the Groundwater Monitoring Plan (GMP), dated May 18, 2004. The objective of the groundwater monitoring program is to generate data for trend analysis of the groundwater contaminant plume in excess of cleanup levels and to assess effectiveness of active remediation at the site. Since 2005, petroleum concentrations in the contaminant plume stopped increasing and have declined as a result of active remediation at the UST release source area. The rate of decline has been less than was anticipated, perhaps due to anoxic conditions (low dissolved oxygen) in the contaminant plume. The Report recommends collecting samples in spring 2015 from wells MW-1, -2, -3, -4, -8, -9, -10, and -14 for COCs GRO and BTEX compounds chemical analyses to assess effectiveness of the newly installed remediation system. The Report also recommends continuing the GMP at the current annual interval until cleanup levels are met.

Bruce Wanstall

1/9/2015

Document, Report, or Work plan Review - other

DEC approved by letter the 2014 Air Sparge/Soil Vapor Extraction System Installation Report by URS regarding remedial treatment of groundwater contamination at the AK Air Juneau Cargo Building LUST facility. URS installed two soil vapor extraction well points, and three air sparge well points using direct-push drilling methods at locations based on the distribution of soil and groundwater contaminants previously identified during historical groundwater monitoring events. Operation of the current AS/SVE treatment system should effectively mitigate groundwater contamination by treating the residual soil contamination in the source.

Bruce Wanstall

10/8/2015

Update or Other Action

DEC received by regular mail a hard copy of Groundwater Monitoring Report Alaska Airlines GSE/Cargo Facility Juneau International Airport Juneau Alaska prepared by AECOM Anchorage in September 2015 as AECOM Project No. 60437490. The groundwater sampling event is scheduled in the corrective action plan and results will evaluate effectiveness of a new air sparge/soil vapor extraction (AS/SVE) system installed in 2014 for Alaska Airlines by URS as Project No. 26219627.

Bruce Wanstall

6/1/2016

Document, Report, or Work plan Review - other

DEC approved by letter and email to Alaska Airlines the sample monitoring report for the cargo facility at the Juneau International Airport submitted by AECOM Inc.

Bruce Wanstall

8/18/2016

Document, Report, or Work plan Review - other

DEC reviewed the Alaska Airlines - Juneau Cargo Building LUST annual site sampling report by AECOM. An air sparge and soil vapor extraction system was installed at the Site in 2014. Report approval letter was sent to Alaska Airlines by regular and electronic mail recommending continued annual monitoring.

Bruce Wanstall

12/27/2017

Document, Report, or Work plan Review - other

Reviewed and approved SLR's December 2017 Groundwater Monitoring and Operation & Maintenance Report for Alaska Airlines - Juneau Cargo Facility with June 2017 groundwater sampling data. ADEC will evaluate site for closure.

Amy Rodman

6/15/2018

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77618 underground storage tanks - fuel.

Amy Rodman

2/6/2019

Site Characterization Report Approved

ADEC reviewed and approved the “Groundwater Monitoring and Operation & Maintenance Report: Alaska Airlines GSE/Cargo Facility Juneau, Alaska” (report) dated December 2018 for the Alaska Airlines - Juneau Cargo Facility site in Juneau, AK. The report was submitted via email on December 21, 2018 by SLR International. The described field effort was conducted in June 2018 and generally consisted of well survey data collection, groundwater monitoring well sampling for laboratory analysis, and air sparging/soil vapor extraction (AS/SVE) system maintenance. Eight groundwater monitoring wells were sampled via low-flow sampling method and analyzed for gasoline range organics (GRO), benzene, toluene, ethylbenzene, and total xylenes (BTEX) concentration. GRO was confirmed above Table C groundwater cleanup levels in the two source area wells (MW-4, 2.24 mg/L and MW-2, 3.06 mg/L). Benzene was confirmed above Table C groundwater cleanup levels in MW-2 at 0.00507 mg/L. Ethylbenzene and total xylenes were confirmed above Table C groundwater cleanup levels at 0.174 mg/L and 0.233 mg/L. Inspection and maintenance was conducted on the AS/SVE system. Well parameters were also measured. Depth to groundwater varied between eight and ten feet below ground surface. The overall trend of contamination is steady or decreasing in all eight remaining groundwater monitoring wells.

Amy Rodman

4/1/2019

Site Characterization Workplan Approved

The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) reviewed and approved the “Site Closure Work Plan: Alaska Airlines GSE/Cargo Facility Juneau, Alaska” (Work Plan) dated March 2019 for the Alaska Airlines - Juneau Cargo Facility site in Juneau, AK. The report was submitted via email on March 13, 2019 by SLR International. The Work Plan generally consists of shutting down the air sparging/soil vapor extraction (AS/SVE) system, sample groundwater monitoring wells biannually post-AS/SVE system shut down, and summarizing site data. Shutdown of the AS/SVE system is scheduled for May 2019 and the first of two biannual groundwater monitoring well sampling events is scheduled for June 2019. The second groundwater sampling event is scheduled for December. Eight groundwater monitoring wells will be sampled and analyzed for diesel range organics (DRO), gasoline range organics (GRO), and benzene, toluene, ethylbenzene, total xylenes (BTEX). Groundwater sampling will continue to be conducted according to the ADEC-approved May 2004 Groundwater Monitoring Plan.

Amy Rodman

2/10/2020

Site Characterization Report Approved

The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) reviewed and approved the “Groundwater Monitoring and Operation & Maintenance Report: Alaska Airlines GSE/Cargo Facility Juneau, Alaska” (report) dated February 202 for the Alaska Airlines - Juneau Cargo Facility site in Juneau, AK. The report was submitted via email on February 4, 2020 by SLR International. The described field effort was conducted in May, June, and December 2019 and generally consisted of shutting down the air sparging/soil vapor extraction (AS/SVE) system, conducting well survey data collection, and two groundwater monitoring well sampling events in 2019 for laboratory analysis. WP for future GW monitoring due March 16, 2020.

Amy Rodman

2/27/2020

Document, Report, or Work plan Review - other

Reviewed the 2020 Alaska Airlines JNU GSE/Cargo Facility Groundwater Sampling Work Plan, dated February 21, 2020. Planned activities generally include water sampling from 4 monitoring wells (MW2, MW4, MW8, and MW9). All water samples are planned for analysis of GRO, DRO, and BTEX. This work plan was approved with the following conditions: (1) If the full suite VOCs have not been sampled in the past, please sample for the entire VOC list under 8260. If VOCs have been sampled and BTEX is the only concern, please still use 8260 for BTEX; and (2) Please use a submersible pump, as opposed to a peristaltic pump during the field effort.

Joshua Barsis

3/1/2021

Document, Report, or Work plan Review - other

2020 Groundwater Monitoring Report received. An ADEC comments letter was issued on April 1, 2021. The RP provided a response to comments on April 16, 2021. An amended report was summitted to ADEC for approval on May 3, 2021.

Julie Fix

5/3/2021

Document, Report, or Work plan Review - other

Received request to use the "2020 Alaska Airlines JNU GSE/Cargo Facility Groundwater Sampling Work Plan" for 2021 groundwater monitoring activities. ADEC comments table and letter regarding 2020 work plan re-use issued on May 11, 2021. Amended workplan and response to comments received on May 25, 2021.

Julie Fix

5/5/2021

Document, Report, or Work plan Review - other

The “2020 Groundwater Monitoring Report” is approved. The report describes field activities that included groundwater sample collection at four groundwater monitoring wells on June 30, 2020 and November 24, 2020. Groundwater monitoring wells MW-02, MW-04, MW-08, and MW-09 were sampled for DRO, GRO, BTEX, and VOCs. Contaminant exceedances above the Groundwater Cleanup Levels were detected at all four monitoring wells at both sampling events. Additionally, four new COCs were identified above cleanup levels. DRO was detected at MW-02, MW-04, MW-08, and MW-09 above cleanup levels. VOCs were sampled for the first time at this site during both 2020 sampling events. Ethylbenzene was detected above cleanup levels at MW-04 and naphthalene at MW-02, MW-04, MW-08, and MW-09. 1,2,3-trichloropropane was detected above cleanup levels at MW-02, 1,2,4-trimethylbenzene at MW-02 and MW-04, and 1,3,5-trimethylbenzene at MW-02 and MW-04. ADEC recommended that Alaska Airlines continue to monitor DRO, BTEX, and VOC groundwater concentrations at MW-02, MW-04, MW-08, MW-09, and MW-15. ADEC also requested additional site characterization to delineate the nature and extent of naphthalene, 1,2,3-trichloropropane, 1,2,4-trimethylbenzene, and 1,3,5-trimethylbenzene in the groundwater at this site. The amended report incorporated all of ADEC’s comments and recommendations.

Julie Fix

5/24/2021

Document, Report, or Work plan Review - other

2021 Groundwater Sampling Work Plan received. The work plan proposes collecting groundwater samples from MW-01, MW-03, MW-10, MW-13, and MW-14 will be analyzed for volatile organic compounds (VOCs) in an effort to delineate the extent of 1,2,3-trichloropropane, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, and naphthalene. Groundwater samples collected from MW-02, MW-04, MW-08, MW-09, and MW-15 will be analyzed for gasoline range organics (GRO), diesel range organics (DRO), and benzene, toluene, ethylbenzene, and xylenes (BTEX).

Julie Fix

6/22/2021

Site Characterization Workplan Approved

2021 Groundwater Sampling Work Plan approved and sent to RP via email. Additional revisions included in workplan: Method 8260 SIM will be used to achieve a lower limit of detection when analyzing for 1,2,3-trichloropropane. All other comments provided by the Department, including representative DNAPL sampling methodology, were accepted and are included in the updated workplan (email chain merged with most recent revision). The site activities described in the work plan are scheduled to commence on July 5, 2021.

Julie Fix

10/20/2021

Document, Report, or Work plan Review - other

"2021 Alaska Airlines Juneau Cargo Facility Groundwater Report" received on this date. An amended report was received on 12/3/2021. Additional comments sent to RP and consultant on 2/7/2022.

Julie Fix

2/24/2022

Document, Report, or Work plan Review - other

The “2021 Groundwater Monitoring Report” was approved on this date. Field work occurred from July 6-8, 2021. The condition of the monitoring wells was evaluated, and the top of the casing was trimmed at several monitoring wells. Groundwater samples were collected from monitoring wells MW-01 through MW-04, MW-08 through MW-10, and MW-13 through MW-15. MW-16 could not be located. MW-02 had exceedances of DRO at 2.23 mg/L, 1,3,5-TMB at 0.075 mg/L, and 1,2,4-TMB at 0.0659 mg/L. MW-04 had exceedances of DRO at 2.37 mg/L, ethylbenzene at 0.0671 mg/L, 1,2,4-TMB at 0.378 mg/L (est. conc.), 1,3,5-TMB at 0.0798 mg/L, and naphthalene at 0.0379 mg/L. MW-08 had exceedances of DRO at 3.3 mg/L, ethylbenzene at 0.0232 mg/L, 1,2,4-TMB at 0.381 mg/L (est. conc.), 1,3,5-TMB at 0.146 mg/L, and naphthalene at 0.0275 mg/L. MW-09 had exceedances of DRO at 1.83 mg/L and naphthalene at 0.00603 mg/L. Analytical results for MW-01, MW-03, MW-13, MW-14, and MW-15 were either non-detect or below cleanup levels. The next sampling event will take place in July 2022. Groundwater samples will be collected and analyzed for DRO and VOCs. GRO concentrations have consistently measured as non-detect or well below the ADEC cleanup level for two or more sampling events at each monitoring well. GRO analysis will be removed from the analyte list.

Julie Fix

5/19/2022

Document, Report, or Work plan Review - other

The "2022 Groundwater Sampling Work Plan" was received on this date and is currently under review.

Julie Fix

6/30/2022

Site Characterization Workplan Approved

The "2022 Groundwater Sampling Work Plan" was approved on this date. The work plan proposes collecting groundwater samples from MW-02, MW-03, MW-04, MW-08, MW-09, MW-10, MW-14, and MW-15. The samples will be analyzed for DRO, BTEX, 1,2,4-TMB, 1,3,5-TMB, and naphthalene. Additionally, an attempt will be made to locate and document the condition of MW-16.

Julie Fix

10/31/2022

Document, Report, or Work plan Review - other

The "2022 Groundwater Monitoring Report" was received on this date.

Julie Fix

4/14/2023

Site Characterization Report Approved

The "2022 Groundwater Monitoring Report" was approved on this date. Groundwater samples were collected from monitoring wells MW-02, MW-03, MW-04, MW-08, MW-09, MW-10, MW-14, and MW-15. Samples were analyzed for DRO, BTEX, 1,2,4-TMB, 1,3,5-TMB, and naphthalene. Exceedances of DRO, 1,2,4-TMB, and naphthalene were detected in MW-08 and MW-09. Additionally, 1,3,5-TMB exceeded cleanup levels in MW-09. MW-04 was not sampled due to insufficient volume of water in the well. A stable and/or decreasing trend must be sufficiently demonstrated in monitoring wells MW-02, MW-04, MW-08, and MW-09 before this site can be considered for closure.

Julie Fix

6/7/2023

Document, Report, or Work plan Review - other

The draft "2023 Alaska Airlines JNU GSE/Cargo Facility Well Replacement and Groundwater Monitoring Work Plan" was received on this date.

Julie Fix

6/16/2023

Site Characterization Workplan Approved

The "2023 Alaska Airlines JNU GSE/Cargo Facility Well Replacement and Groundwater Monitoring Work Plan" was approved on this date. The work plan proposes decommissioning MW-04 and advancing a new soil boring adjacent to MW-04. This well will be completed as a groundwater monitoring well (MW-04R). Soil and groundwater samples will be collected from this boring and analyzed for DRO, BTEX, 1,2,4-TMB, 1,3,5-TMB, and naphthalene. Additional groundwater samples will be collected from monitoring wells MW-02 through MW-03, MW-08 through MW-10, MW-14, and MW-15. Samples will be analyzed for DRO, BTEX, 1,2,4-TMB, 1,3,5-TMB, and naphthalene.

Julie Fix

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Site Report: Alaska Airlines - Juneau Cargo Facility

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