| Action Date |
Action |
Description |
DEC Staff |
| 9/23/2008 |
Potentially Responsible Party/State Interest Letter |
DEC/PERP requests Delta Western provide intent to provide cleanup plans and site controls for ongoing petroleum release at the retail fuel facility in Haines. Spill #08119926001 |
Bruce Wanstall |
| 5/18/2009 |
Site Visit |
Contaminated Sites and Prevention, Preparedness and Response (PPR) staff observed an excavation by Nortech to investigate soil and surface water contamination that was daylighting in the drainage ditch behind the gas station building and seeping slowly into Sawmill Creek. The volume of contaminated material excavated was estimated at 180 cubic yards and was transported to the Delta Western bulk fuel tank farm property where it was stockpiled between (inappropriate) temporary liners. The inactive bulk fuel facility is located in a busy area across the street from the Haines Post Office and is adjacent to a City Park and Beach Road. |
Bruce Wanstall |
| 6/17/2009 |
Update or Other Action |
Corrective Action Plan by Nortech dated 6/17/09 estimates the volume of subsurface material contaminated with gasoline at the facility to be 800 to 1,000 cubic yards. 180 cubic yards of contaminated material has been removed from the property and is stockpiled between liners on other property in Haines owned by Delta Western. |
Bruce Wanstall |
| 9/10/2009 |
Update or Other Action |
DEC/PERP requested that Delta Western submit weekly progress reports on efforts to meet requests for investigation, cleanup and site controls of ongoing petroleum release at the retail fuel facility. |
Bruce Wanstall |
| 9/16/2009 |
Update or Other Action |
A Dual Phase Vapor Extraction System installed by Nortech to reduce gasoline and benzene contamination found at the site during previous investigation. Eight vacuum hoses connect to extraction points in the subuface; seven are located beneath the dispenser islands where the highest concentrations have been found. The eighth extraction point is near the ground water well located behind the shop building. |
Bruce Wanstall |
| 10/23/2009 |
Update or Other Action |
The DEC approved suspending operation of the Dual Phase Vapor Extraction System until Spring 2010 as long as Sawmill Creek is not affected by petroleum contamination during the period of shutdown. Fall 2009 sampling found petroleum contamination in the water column of Sawmill Creek and sheen was observed seeping from the streambank and on the water. Since the source of the seep could be from the subsurface contamination, DEC/PERP requested that Delta Western maintain consistent abatement measures that will control any other surface petroleum release to Sawmill Creek. Site controls include no disposal of excessive snow removal from the facility onto the banks of Sawmill Creek that could agravate ongoing petroleum release to the creek. |
Bruce Wanstall |
| 11/20/2009 |
Update or Other Action |
DEC requested that weekly update reporting from Delta Western be reduced to monthly reports through the winter months. If data indicate petroleum impacts to Sawmill Creek are ongoing then operation of the in-situ treatment system will resume immediately as stipulated in the October 2009 letter from PERP authorizing the shutdown. |
Bruce Wanstall |
| 1/26/2010 |
Spill Transferred from Prevention Preparedness and Response Program |
Spill transferred by PERP staff Sarah Moore. Spill no. 08119926001; spill date 9/16/08; substances = gasoline, diesel, and used oil in unknown quantities; PERP file no. 1508.02.035. |
Mitzi Read |
| 1/28/2010 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 2/3/2010 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 78851 name: Delta Western Station Haines |
Mitzi Read |
| 2/24/2010 |
Meeting or Teleconference Held |
Contaminate Sites Program (CSP) reviewed the investigation of contaminated media at the Delta Western Station in Haines that SART recently transferred to CSP. Remedial options; conceptual site model data gaps on exposure pathways and CSP quality assurance requirements were discussed with and sent by letter to the Delta Western Seattle office. Inquiry into Sawmill Creek located adjacent to the facility found that the stream is ADF&G catalogued anadromous rearing habitat for king salmon. A teleconference was held with a Delta Western consultant to discuss recent and future site investigation into source areas and exposure pathways and practicable remedial cleanup options for the accessible and inaccessible source areas in the gasoline and diesel spill zone. Multiple drinking water wells are within ¼ mile of the active facility. |
Bruce Wanstall |
| 4/6/2010 |
Update or Other Action |
Monthly update received from Delta Western. The quarterly spring well sampling in March was delayed by snow conditions in Haines and was adjusted to take place in April. Reply to Delta Western with a request to submit a workplan for sample collection no later than mid-April from all 8 wells to analyze for benzene, toluene, ethylbenzene, xylenes (BTEX), gasoline range organics (GRO), diesel range organics (DRO), and residual range organics (RRO) parameters. |
Bruce Wanstall |
| 4/12/2010 |
Update or Other Action |
DEC reviewed and approved the proposed plan to sample wells at the Delta Western Station Haines contaminated site. The proposal states that ADEC policy and sampling methods will be followed and that a conceptual site model will be developed identifying site specific completed exposure pathways that pose a risk to human health, safety, and welfare and the environment. The proposal is a good outline to expand into a sampling methodology for the site characterization and cleanup plan. |
Bruce Wanstall |
| 5/14/2010 |
Document, Report, or Work plan Review - other |
Chilkat Environmental April 2010 monitoring well sample analysis data were reviewed for DEC quality assurance criteria. The field methods and data collection adhere to approved work plan and meet standards. |
Bruce Wanstall |
| 5/26/2010 |
Cleanup Level(s) Approved |
The ADEC reviewed and approved the April 2010 Well Sampling Report and Conceptual Site Model (CSM) submitted in May 2010 by Chilkat Environmental for the Delta Western Station Haines Contaminated Site. The ADEC letter provided Delta Western with the regulatory points of compliance and applicable media cleanup levels for the site with a request that best management practices to achieve a permanent cleanup remedy be implemented as soon as possible to control and treat gasoline contaminated soil and the off-site migration of contaminated ground water to the adjacent salmon stream. |
Bruce Wanstall |
| 6/30/2010 |
Document, Report, or Work plan Review - other |
May 2010 Monitoring Well Sampling Report is approved for ADEC laboratory analysis quality assurance criteria. The field methods and data collection adhere to the ADEC approved work plan. The data indicate that concentrations of ground water contamination (gasoline, benzene, toluene, ethylbenzene, total xylenes and diesel) are either similar to the April sampling data or are increasing at all locations including in the direction of Sawmill Creek. Quarterly monitoring of ground water will continue. |
Bruce Wanstall |
| 7/6/2010 |
Document, Report, or Work plan Review - other |
ADEC evaluated and approved the ChemTrack 2010 Planned Activities (workplan framework) for Investigation, Site Control and Remediation of soil and ground water contamination at the Delta Western Station Haines contaminated site. ADEC again suggested that a sump be installed to collect and isolate surface water runoff and off-site subsurface water diverted from the property boundaries. Monitoring and/or treatment of one or all the water sources are necessary before release into the stream is permitted. |
Bruce Wanstall |
| 7/13/2011 |
Cleanup Plan Approved |
DEC authorized ChemTrack to proceed with the Bioswale Plan for installation of an active groundwater treatment system in conjunction with a facility upgrade to control and treat storm water runoff by routing it through a bioswale. The certified engineered plan for the Haines Tesoro Station will require developmental changes to adapt to potentially variable on-site conditions. As-built plans and a long term groundwater sampling plan and a treatment system operations plan are requested by the DEC. |
Bruce Wanstall |
| 8/8/2011 |
Update or Other Action |
In accordance with AS 16.05.87 (a), Alaska Dept Fish & Game Habitat Division approval is granted for Permit FH11-1-0130 on Sawmill Creek Stream No. 115-32-10300-2002 to construct a bioswale water treatment system at the Delta Western Service Station in Haines. The system involves installing a 30 inch diameter discharge pipe below ordinary high water in Sawmill Creek. A 1/8 inch mesh screen will cover the end of the pipe. In order to limit impacts to anadromous fish found in Sawmill Creek, the in-water piping work will take place between the first of June and the end of September. In accordance with the DEC approved Bioswale Plan, during construction of the remainder of upland structures of the bioswale, Delta Western will employ best managment practices to intercept and control excess suspended solids in surface water migtrating from the facility property. |
Bruce Wanstall |
| 9/6/2011 |
Update or Other Action |
DEC contacted Delta Western and ChemTrack to discuss the new monitor well installation proposal for September 2011. The placement of new wells will intercept groundwater flow from the dispenser island source area. The locations on the property will be set back inside the groundwater barrier and capture zones along Spruce Grove Road and Sawmill Creek. |
Bruce Wanstall |
| 10/5/2011 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78851 Delta Western Station Haines. |
Bruce Wanstall |
| 4/23/2012 |
Document, Report, or Work plan Review - other |
The Contaminated Sites Program (DEC) has reviewed the report titled: Delta Western Monitoring Well Installation & Sampling, Haines, Alaska, Sampling Report completed by ChemTrack Inc that documents well installation and groundwater sample monitoring at the Tesoro Station and adherence to the approved work plan. The 2011 site activity met the objectives of the project and the resulting analytical data is sufficient to be used to support the decision making process. In accordance with Title 18 Alaska Administrative Code (AAC) 75.360, qualified person(s) used data collection and field sampling methods consistent with DEC methodology in the approved site assessment work plan. With the exception of the requested laboratory checklist, the data meet field and laboratory report quality assurance criteria in Contaminated Sites Program guidance documents, therefore the Report is approved in accordance with 18 AAC 75.335(d). |
Bruce Wanstall |
| 5/16/2012 |
Site Characterization Workplan Approved |
DEC evaluated and sent approval by electronic mail for a ChemTrack Plan to transport contaminated soil from site activities at the Delta Western Tesoro gas station for storage in a temporary stockpile on the bulk fuel tank site. |
Bruce Wanstall |
| 5/22/2012 |
Site Visit |
DEC traveled to Haines by fixed wing aircraft to meet with Delta Western Fred Gray to inspect the site activities at the Tesoro gas station. Later DEC met with Delta Western Fred Gray and ChemTrack staff Chris and Emery at the contaminated soil stockpile storage site on Haines Highway Cutoff. Return travel to Juneau was by fixed wing aircraft. |
Bruce Wanstall |
| 11/21/2012 |
Offsite Soil or Groundwater Disposal Approved |
DEC sent a signed Approval Form by email to ChemTrack Alaska Inc for the transport of a volume of 350-400 cubic yards of petroleum contaminated soil from the approved stockpile storage at the Delta Western Tank Farm on Haines Highway in covered containers for shipping by barge to Columbia Ridge Landfill in Arlington OR c/o Waste Management Inc. |
Bruce Wanstall |
| 12/6/2012 |
Document, Report, or Work plan Review - other |
DEC received a water sampling report by electronic mail from ChemTrack for the Haines Tesoro Station site. DEC replied with an approval and comment message to ChemTrack with pertinent attachments. DEC comments in the message included requests for as-builts for the bioswale treatment system and a revised sampling and analyais plan with a schedule to repeat the site activity (with requested changes) in spring 2013. Sampling results indicate that the treatment system removed petroleum contamination from the groundwater and that the bioswale removed petroleum contamination from surface runoff. |
Bruce Wanstall |
| 3/7/2013 |
Document, Report, or Work plan Review - other |
DEC evaluation of the water sample data and ChemTrack quality assurance checklist on the water sample laboratory report by TestAmerica dated 11/16/2012 found the comments and conclusions acceptable for the specified criteria. |
Bruce Wanstall |
| 4/9/2013 |
Cleanup Plan Approved |
DEC evaluated the ChemTrack Alaska Plan that describes the design and installation of the groundwater treatment system and the methods and procedures for collection and analysis of groundwater samples. Sample results will verify the effectiveness of the treatment system and help monitor the contamination levels of the groundwater before treatment.
The Plan objective, purpose, designs and methodology, sampling and reporting schedules are in accordance with Title 18 Alaska Administrative Code 75.325 and 75.355. The Plan responds appropriately to the request made by DEC to investigate and clean up contaminated soil and groundwater associated with the petroleum release at the Delta Western (Tesoro) Station located in Haines, Alaska. In accordance with Title 18 AAC 75.320 the Plan is hereby approved. |
Bruce Wanstall |
| 4/29/2013 |
Site Visit |
DEC met with Imre (ChemTrack) and Cheryl (Delta Western) to inspect the bioswale groundwater treatment system at the Tesoro Station. In accordance with the groundwater Sampling Analysis Plan (SAP) approved in 2013, during each biannual sampling event ChemTrack will collect a pre-treatment and post-treatment water sample from the groundwater discharge. Analytical results will document that the treatment system is adequately removing hydrocarbons, and will determine when treatment of the effluent is no longer necessary. ChemTrack will drain the remaining monitoring wells (MW 13, MW 14, and MW 15) of water during the scheduled sampling event and if recharge is sufficient water samples will be collected. The treatment system intake is down gradient of the monitoring wells and has reduced average groundwater level so the monitoring wells may not recharge.
|
Bruce Wanstall |
| 8/6/2013 |
Document, Report, or Work plan Review - other |
DEC evaluated Groundwater Treatment Installation and Analytical Sampling Report dated July, 2013 by ChemTrack and a letter approving the Report was sent to ChemTrack by regular mail and a copy was sent to Delta Western by email. |
Bruce Wanstall |
| 1/14/2014 |
Document, Report, or Work plan Review - other |
DEC evaluated the ChemTrack Analytical Sampling Report dated August, 2013 and sent a DEC Sampling Report Approval letter by regular mail to ChemTrack and a copy was sent to Delta Western by email. |
Bruce Wanstall |
| 5/13/2014 |
Long Term Monitoring Established |
Groundwater Collection Sampling and Analysis Plan (SAP), Delta Western Haines Station Hazard ID 25489. ChemTrack Inc, as an impartial third party qualified person, proposed data collection and field screening methods that are consistent with DEC methodology. The SAP meets the field and laboratory report quality assurance criteria in Contaminated Sites Program guidance documents, therefore the SAP is approved in accordance with 18 AAC 75.335(b). The SAP provides defensible controls that protect complete exposure pathways and receptors at the site until the fate and transport mechanisms for contaminated media no longer present a risk. |
Bruce Wanstall |
| 2/6/2015 |
Document, Report, or Work plan Review - other |
DEC evaluated Groundwater Treatment Maintenance and Analytical Sampling Report by ChemTrack Alaska Inc. and sent an approval letter to the Environmental Manager for Delta Western Inc. in the Seattle office. In accordance with Title 18 Alaska Administrative Code (AAC) 75.360, qualified person(s) collected samples in accordance with DEC methods and the approved monitoring work plan. The laboratory report checklists submitted are acceptable and the data meet field and laboratory report quality assurance criteria in Contaminated Sites Program guidance documents, therefore the Report is approved in accordance with 18 AAC 75.335(d).
The Report concludes the analytical results confirm that the groundwater treatment system is functioning properly. For all COC analytes tested, including the TAH and TAqH results, the post treatment samples were well below the established cleanup levels. The iron bacteria still continues to back up the system but with routine cleanings, no significant problems are anticipated.
DEC concurs with the conclusions in the Report and recommends continuing with the approved maintenance, sampling and analysis plan on a biannual schedule and reporting on an annual basis.
|
Bruce Wanstall |
| 6/2/2015 |
Site Visit |
DEC traveled to Haines and met with ChemTrack (Imre Manyoky) at the gas station to evaluate the site. DEC agreed with recommendations how to proceed with maintaining the groundwater treatment system based on observation and monitoring data. |
Bruce Wanstall |
| 7/22/2016 |
Site Characterization Workplan Approved |
DEC has reviewed: Groundwater Treatment Maintenance and Analytical Sampling Report dated June 2016. ChemTrack Alaska Inc. completed the report documenting implementation of the DEC approved maintenance, monitoring and reporting work plan at the Site. The analytical results confirm that the groundwater treatment system is functioning properly. For all the analytes tested, including the TAH and TAqH results, the post treatment samples were well below the established cleanup levels. The iron bacteria still continues to back up the system but with routine cleanings, no significant problems are anticipated. DEC concurs with the conclusions in the Report and recommends continuing with the approved maintenance, sampling and analysis plan on a biannual schedule and reporting on an annual basis. |
Bruce Wanstall |
| 2/6/2017 |
Document, Report, or Work plan Review - other |
DEC has reviewed and approved by letter Groundwater Treatment Maintenance and Analytical Sampling Report (Report), dated January, 2017. ChemTrack Alaska Inc. completed the Report documenting implementation of the DEC approved maintenance, monitoring and reporting work plan at the Site for Delta Western Incorporated. Groundwater collection occurs in six inch diameter perforated pipes that connect to four 30-gallon granulated activated carbon (GAC) filters. Water is gravity fed through the first two units connected in series, then through two polisher units that are connected in parallel, and then into the manhole. A submersible pump moves treated groundwater from the manhole to the city sewer. For all analytes tested, the post treatment samples were well below the cleanup levels, indicating that the GAC system is functioning properly. The iron bacteria continues to buildup and slow the flow rate through the system. With routine cleanings of the groundwater collection pipes and GAC units, no significant problems are anticipated. |
Bruce Wanstall |
| 4/19/2017 |
Document, Report, or Work plan Review - other |
DEC has reviewed and approved by letter sent by electronic mail Station Well Decommissioning Plan (Plan), dated April, 2017. ChemTrack submitted the Plan for Delta Western regarding activity at the referenced Site. The Plan was developed in accordance with DEC Monitoring Well Guidance dated September 2013 and Vadose Zone Monitoring Devices, Boreholes, and Other Devices for Environmental Activities ASTM D5299-99 (2012). DEC review of this specific work plan is to ensure that the work is done in accordance with State of Alaska environmental conservation laws and regulations and industry standards. The Plan is approved in accordance with 18 AAC 75.335(b). |
Bruce Wanstall |
| 8/3/2017 |
Spill Transferred from Prevention Preparedness and Response Program |
Spill no. 17119921401. A report of free product petroleum in the Spruce St. right of way adjacent to the gas station facility discovered during city utility work was submitted to DEC by the City of Haines on 8/3/2017. Delta Western was notified of the contamination. |
Sally Schlichting |
| 9/13/2017 |
Update or Other Action |
File transferred to Anchorage. |
Erin Gleason |
| 9/13/2017 |
Update or Other Action |
On August 8, 2017, ADEC sent Delta Western an email of DEC’s concern that there may be an ongoing release at the Delta Western Haines facility (900 Main Street). ADEC recommend that Delta Western piping and fuel storage infrastructure be immediately inspected along with facility fuel records to determine if a recent release has occurred. Delta Western conducted a 3rd party buried pipe test on 8/17/2017 and internal fuel reconciliation. No leaks/new releases are suspected at this time |
Erin Gleason |
| 7/9/2018 |
Document, Report, or Work plan Review - other |
Received draft groundwater sampling report from ChemTrack 4/19/2017. ADEC has reviewed the report and requests some revisions. |
Erin Gleason |
| 7/12/2018 |
Meeting or Teleconference Held |
Meeting with Delta Western, ADEC, and Chemtrack today. Discussed out stand questions at the site, decided to update work plan during winter 2018/2019, and discussed ADEC requests for 2018 report. Report is due no later than 12/31/2018. |
Erin Gleason |
| 9/14/2018 |
Update or Other Action |
Recevied revise report from Chemtrack for groundwater monitoring and well decommissioning. |
Erin Gleason |
| 10/16/2018 |
Update or Other Action |
Received phone call from Chris Schelb at ADOT. They plan to construct a culvert and water collection system that would divert melt water into Sawmill creek next to the existing cross-road culvert and present overflow of water onto the road by the ADF&G building. |
Erin Gleason |
| 11/8/2018 |
Meeting or Teleconference Held |
Meeting with ADOT design, ADEC, Chemtrack, and Delta Western to discuss the summer 2019 ADOT culvert and drainage project. The group does not anticipate that the ADOT project will influence the Delta Western site at this time. In the event that contaminated soil or water in encountered during the construction, ADOT will contact ADEC. The ADOT storm drain discharge hole may be near the bioswale. ADOT will work Delta Western to ensure that they don't overlap. |
Erin Gleason |
| 12/10/2018 |
Update or Other Action |
The second biannual sampling event took place today. The GAC filters were not changes due to contaminated carbon. GAC will be changed in May 2019. |
Erin Gleason |
| 12/27/2018 |
Update or Other Action |
Due date for 2018 report extended to 1/31/2019. |
Erin Gleason |
| 2/11/2019 |
Meeting or Teleconference Held |
Phone meeting with ADOT today to review plans for summer 2019 road project. A series of manholes connected via pipes will be installed along the road adjacent to the Delta Western Gas station on the south side. The pipes will outfall into Sawmill creek at a riprap. In the event that ADOT finds contamination during construction, they will contact ADOT. Based on their drawings, ADEC does not anticipate that they will encounter contaminated soil. |
Erin Gleason |
| 3/11/2019 |
Document, Report, or Work plan Review - other |
Received draft 2018 groundwater monitoring report from Chemtrack on 1/31/2019. ADEC has reviewed the report and requests revisions. Revised report due 5/1/2019. |
Erin Gleason |
| 5/29/2019 |
Site Characterization Report Approved |
Received the revised Delta Western Station Annual Sample Report from ChemTrack. ADEC has reviewed the report and it is now approved. In 2018 all effluent samples were below cleanup levels. |
Erin Gleason |
| 6/20/2019 |
Update or Other Action |
ADEC received the 2019 work plan from Chemtrack on behalf of Northstar energy. DEC will review and approve. |
Erin Gleason |
| 7/3/2019 |
Document, Report, or Work plan Review - other |
Sent letter to Delta Western Requesting additional information prior to work plan approval. Information due July 22, 2019. |
Erin Gleason |
| 9/16/2019 |
Meeting or Teleconference Held |
Meeting with Environmental Management Inc. (EMI) to discuss upcoming work plan for 2020. They have reviewed the entire file and propose to delineate soil and water contamination at the site, investigate impacts (if any) to creek, and determine if free product is present on site. They intend to submit a new work plan in winter 2020. |
Erin Gleason |
| 11/8/2019 |
Site Characterization Report Approved |
ADEC received the annual groundwater monitoring report from Chemtrack on 10/31/2019. ADEC has reviewed the report and it is now approved. ADEC notes that a work plan is still outstanding and request that the work plan be submitted by 12/31/2019. |
Erin Gleason |
| 11/14/2019 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approves the transport of 220 gallons of spent granular activated carbon (GAC) material to the Anchorage municipal landfill, pending their acceptance. The GAC had detection of benzene in the toxicity characteristic leaching procedure (TCLP) analysis. |
Erin Gleason |
| 12/31/2019 |
Update or Other Action |
Work plan deadline extended to 1/31/2020. |
Erin Gleason |
| 2/28/2020 |
Document, Report, or Work plan Review - other |
EMI submitted a work plan on behalf of Northstar energy for additional sampling at the site on January 31, 2020. ADEC has reviewed the work plan and requests revisions. |
Erin Gleason |
| 4/2/2020 |
Site Characterization Workplan Approved |
ADEC received the revised work plan from Environmental Management Inc. ADEC has reviewed the work plan and it is now approved. |
Erin Gleason |
| 6/24/2020 |
Update or Other Action |
Geo-probe borings and Optical Image Profiling (OIP) equipment was used in areas of gross contamination from previous sampling events. OIP was used at all three locations of potential product recovery wells along with confirmation sampling. We did not encounter anything that would be indicative of free product. Photoionization Dectecor (PID) readings in the smear zones were less than 20 ppm. Based on this information, we do not believe free product is present at the site. As such, no product recovery wells will be installed as proposed in the 2020 approved work plan. |
Erin Gleason |
| 11/9/2020 |
Site Characterization Report Approved |
ADEC received the 2020 Characterization Report on October 23, 2020. ADEC has reviewed the report and it is now approved. DRO, VOC, and naphthalene were found about migration to groundwater cleanup levels in soil. DRO, VOC, and PAHs were above cleanup levels in groundwater. The Sawmill Creek samples were below 18 AAC 70 TAH and TaqH. No free product was found during the 2020 investigation. Based on observations from 2020, the groundwater treatment stystem is in need of repair. ADEC request a work plan addendum be submitted which includes sampling of groundwater and surface water and repair of treatment system. Due date is 12/31/2020. |
Erin Gleason |
| 3/2/2021 |
Document, Report, or Work plan Review - other |
ADEC received a draft work plan addendum from EMI on 1/25/21. ADEC has reviewed the work plan addendum and it is approved. Summer 2021 sampling will include the creek, monitoring wells, and surface soil. In addition, the GAC will be changed and repairs will be made to the treatment system. |
Erin Gleason |
| 10/27/2021 |
Document, Report, or Work plan Review - other |
ADEC received the 2021 monitoring report on 10/25/2021. ADEC will review and provide comments to Delta Western. |
Erin Gleason |
| 5/10/2022 |
Site Characterization Report Approved |
ADEC received the 2021 Site Characterization Report from Environmental Management Inc. ADEC has reviewed the work plan and it is now approved. According to the October 2021 sampling event, contamination from historic spills still exist on the site in the soil and groundwater. Based on analytical results, all three monitoring wells sampled (MW16, MW17, and MW19) exceeded groundwater cleanup levels for naphthalene, benzene, ethylbenzene, and 1,2,4-trimethylbenzene in addition to other analytes in select wells. Concentrations of detected analytes in MW16 and MW19 decreased from the 2020 sampling event, while those in MW17 increased. The groundwater treatment system appears to be in good condition with benzene, diesel range organics (DRO) and residual range organics (RRO) detected in the pre-treatment water sample, but not detected in the post-treatment water sample. In the soil, DRO, RRO, gasoline range organics (GRO), volatile organic compounds (VOCs), and polycyclic aromatic hydrocarbons (PAHs), were present below ADEC cleanup levels at approximately 1-foot below grade surface along the northern property boundary. |
Naomi Mason |
| 5/24/2022 |
Site Characterization Workplan Approved |
2022 Work Plan Addendum for Monitoring and Groundwater Treatment System Maintenance (to the 2020 Work Plan) was received on 5/20/2022 and it is now approved. Approval letter sent on this date. |
Naomi Mason |
| 2/2/2023 |
Site Characterization Report Approved |
On December 19, 2022, ADEC received the "Monitoring and Groundwater Treatment System Maintenance Report 2022." ADEC has reviewed the report and it is now approved. Three monitoring wells remain on the property along the northern perimeter. A petroleum sheen was present in two of the monitoring wells. The third monitoring well contained concentrations of GRO, DRO, RRO, VOCs, and PAHs in exceedance of groundwater cleanup levels. Surface water samples were non-detect. Maintenance was performed on the water treatment system and pre-treatment samples contained concentrations of RRO, benzene, ethylbenzene, and xylenes, but below groundwater cleanup levels. No analytes were detected in post-treatment samples from the old or newly replaced GAC above groundwater cleanup levels. After two years of consistent non-detect results from post-treatment water of GAC, the GAC will now be replaced every other year. However, annual monitoring and sampling of pre- and post-treatment water will continue. Data gaps include delineating groundwater contamination to the south across Main Street, and delineating soil and possible groundwater contamination to the north of previous soil borings/monitoring wells. |
Naomi Mason |
| 4/25/2023 |
Site Characterization Workplan Approved |
Work plan addendum received on 4/18/2023, the work plan has been reviewed and is now approved. Field work is scheduled to take place in July 2023. |
Naomi Mason |
| 1/10/2024 |
Site Characterization Report Approved |
ADEC received the “Groundwater Treatment System Monitoring Report 2023”, dated November 22, 2023, via electronic mail on December 2, 2023. The report details the field effort and sampling results of June 2023 which was conducted in accordance with the April 2020 Site Characterization Work Plan and April 18, 2023, Work Plan Addendum.
This report is approved.
The report generally describes the field activities that took place on June 15, 2023. Three monitoring wells (MW-16, MW-17, MW-19) were not sampled due to the presence of a petroleum sheen on top of the water, during water level measurements. Surface water sampling from Sawmill Creek was taken upstream of the site at the outlet of the culvert below Main Street (SW1) and immediately downstream of the site at the outlet of the culvert below Spruce Grove Road (SW3). Surface water samples were analyzed for Gasoline Range Organics (GRO), Diesel Range Organics (DRO), Residual Range Organics (RRO), Total Aromatic Hydrocarbons (TAH), and Total Aqueous Hydrocarbons (TAqH). No analytes were detected above Limit of Quantitation (LOQ), except for RRO, which was detected at concentrations less than groundwater cleanup levels. Remediation system sampling and maintenance consisted of inspecting the system upon arrival and appeared to function normally. Water samples were collected from pre- and post-treatment water and analyzed for GRO, DRO, RRO, and benzene, toluene, ethylbenzene, and xylenes (BTEX). No samples contained concentrations greater than the groundwater cleanup levels. The Granular Activated Carbon (GAC) or filter bags were not replaced in 2023, therefore should be replaced in 2024, per the ADEC approval letter dated February 2, 2023, approving the replacement of GAC to be reduced from every year to every other year, based on the current sample concentrations.
|
Stacee Henderson |
| 5/13/2024 |
Update or Other Action |
RP requested concurrence in reduction of site characterization investigation. The ADEC does not concur as contamination may extent off-site to the north and to the northwest. Subsurface contamination has not been delineated to the north/northwest. Groundwater monitoring wells should be installed upgradient (south) and downgradient (northwest). These data gaps were identified previously and works were not completed as intended in the “Site Characterization Work Plan” dated April 2, 2020.
|
Stacee Henderson |
| 6/5/2024 |
Meeting or Teleconference Held |
Teleconference held on this date with DEC, RP, and consultant to discuss the site and path forward for site characterization. RP will continue monitoring surface water, existing monitoring wells, and change GAC filters, in 2024, under existing work plan/amendments. RP will provide DEC with a work plan (by end of 2024/early 2025) to investigate the data gaps for the 2025 field season. |
Stacee Henderson |
| 7/10/2024 |
Site Characterization Workplan Approved |
Reviewed and approved the 2024 Work Plan Addendum for Monitoring and Groundwater Treatment System Maintenance (to the 2020 Work Plan), dated July 9, 2024. Approval email sent on this date. The work plan include surface water sampling from Sawmill Creek, groundwater monitoring at MW16, MW17, and MW19, and GAC System sampling and maintenance. |
Stacee Henderson |
