| Action Date |
Action |
Description |
DEC Staff |
| 10/17/2006 |
Site Added to Database |
Site added to the database. |
Mitzi Read |
| 12/28/2006 |
Update or Other Action |
OIT Certificate of RCRA Exemption forms received from OASIS. Purge water contained 12.2 mg/L DRO, 1.54 mg/L GRO, 0.05 ug/L benzene. |
Kim DeRuyter |
| 1/16/2007 |
Update or Other Action |
Called Kris Dubois to discuss Prospective Purchaser Agreements and the lessee history of the site. Bernie Hall is looking into assuming the lease from Saupe. Chevron has documented their intent to assess and remediate contamination from their former bulk fuel operation which was in operation from 1962 to 1985. FIA has some documentation linking contamination at the adjacent property (Block 13 Lot 15B - Hotfoot International) to Chevron's operation. At this time Chevron has not committed to take on remediation of the Hotfoot site. |
Kim DeRuyter |
| 1/19/2007 |
Site Characterization Report Approved |
Site Characterization report received from FIA. FIA-conducted this site investigation in order to facilitate a property transfer. The report indicates that a large portion of the site has been impacted by surface spills which have migrated to groundwater. The highest soil contamination observed was DRO at 9060 mg/kg, GRO at 5720 mg/kg and benzene at 22.2 mg/kg. PAH and VOC analytes did not exceed cleanup levels with the exception of napthalene which was observed at 27.2 mg/kg in soil boring 9-6-8. However, PQL's were above the cleanup level for some analytes. Groundwater contamination was observed as high as 34.3 mg/L DRO, and 7.25 mg/L GRO. |
Kim DeRuyter |
| 2/13/2007 |
Update or Other Action |
Received a response to the PRP letter from Bernie Saupe. He reports that he used the warehouse as a parking garage for two truck tankers, and two tanker-trailers and the only fuel storage was the buried heating oil tank. He mentions a floor sump which he cleaned out when he took possession of the building. He also mentions that there had been a well on the property which Chevron had removed along with the restroom prior to his taking possession. There is no mention of the location of the former septic system. |
Kim DeRuyter |
| 2/13/2007 |
Exposure Tracking Model Ranking |
Baseline ranking completed based on the January 2007 Oasis final site characterization report. Potential ecological impacts to the Airport Pond should be evaluated. |
Kim DeRuyter |
| 1/17/2008 |
Update or Other Action |
ARCADIS BBL submited the 2007 Assessment report for the Former Chevron Facility #309152, Saupe Enterprises Site. The Site Assessment results show that groundwater and soil are impacted near wells MW1 to MW4 located northeast of the building. Samples from MW3 had the highest concentrations. LNAPL was observed in wells MW3 and MW4 in August and Nov. A workplan for delineation of LNAPL and impacted groundwater will be prepared for the 2008 field season. |
Tamara Cardona-Marek |
| 2/25/2008 |
Update or Other Action |
ADEC received the ARCADIS Workplan for Monitoring Well Installation. The plan proposes to add five monitoring wells to further delineate the extent of the groundwater contamination. |
Tamara Cardona-Marek |
| 7/1/2008 |
Update or Other Action |
ADEC received the Petroleum Hydrocarbon Fingerprinting Results for Former Chevron Facility 309152 (Saupe Enterprises Site). |
Tamara Cardona-Marek |
| 7/10/2008 |
Update or Other Action |
ADEC received the First Quarter 2008 Groundwater Monitoring Report for the FIA Saupe Entreprises site. Impacted groundwater was found in the vicinity of wells MW1-MW-4. Measurable LNAPL was observed in wells MW2,MW3,and MW4. Additional groundwater delineation will take place during the summer 2008. |
Tamara Cardona-Marek |
| 7/11/2008 |
Meeting or Teleconference Held |
Met with Dan Carrier (Chevron) and Greg Montgomery (Arcadis) to discuss current activities at the site and plans to do additional assessment. ADEC suggested using temporary wells along the adjacent road to determine if product is originating from an upgradient source, ARCADIS will install a monitoring well at this moment and determine the need for temporary wells based on the results obtained from this well. ADEC also requested sampling the porewater adjacent to the pond. |
Tamara Cardona-Marek |
| 9/19/2008 |
Update or Other Action |
Approved disposal of contaminated soil resulting from well installation and identified post-treatment analysis for ASR facility. |
Tamara Cardona-Marek |
| 3/13/2009 |
Meeting or Teleconference Held |
ADEC discussed with Arcadis and Chevron the status of the site on 3/3/2009. ADEC requested additional characterization north of MW-6 and east of MW-9. Chevron will do additional groundwater gauging to determine the need for more characterization, as requested by DEC. Piezometers will be installed along the pond during the 2009 field season. Semi-annual sampling will take place in 2009. |
Tamara Cardona-Marek |
| 7/14/2009 |
Document, Report, or Work plan Review - other |
DEC received the Work Plan for Additional Assessment for the Formet Chevron Facility 309152. Additional site assessment activities consist of piezometer installation, surface water gauge installation, soil and groundwater sampling, and storm water culvert sampling. |
Tamara Cardona-Marek |
| 7/29/2009 |
Site Visit |
Piezometers installed near pond. Original proposed depth was not reached due to sloughing. Chevron project manager on site. |
Tamara Cardona-Marek |
| 9/3/2009 |
Update or Other Action |
Current site lessee will install a grey water tank at the site. Tank will be installed in the vicinity of MW-10 and disposal of excavated soil will be coordinated with Arcadis. |
Tamara Cardona-Marek |
| 10/29/2009 |
Document, Report, or Work plan Review - other |
DEC received and reviewed the First Semi-Annual 2009 Groundwater Monitoring Report from Arcadis. LNAPL was present in wells MW-1 through MW-4, MW-6, MW-9 and RW-1. MW-8 was inaccesible. DRO was above cleanup levels in MW-7. Benzene was above cleanup levels in MW-5, MW-8 and MW-10. EDB, MTBE and PAH's were not above cleanup levels in any of the samples. Geochemical parameters were collected in groundwater also. |
Tamara Cardona-Marek |
| 2/2/2010 |
Document, Report, or Work plan Review - other |
DEC received and reviewed the Second Semi Annual 2009 Groundwater Monitoring Report. LNAPL was detected in wells MW1, MW2, MW3, MW4, MW6 and MW9. These wells were not sampled.
Contaminants above cleanup levels in remaining wells inluded GRO (up to 12,100 ppb), DRO (up to 5670 ppb), benzene (up to 240ppb) and EDB (2.76 ppb). Wells MW-5, MW-10 and MW-11 had no contaminants above cleanup levels. Piezometers installed adjacent to pond were not sampled during this sampling event. MNA parameters were measured in wells without free product. No conclusions were made based on the small amount of MNA data. |
Tamara Cardona-Marek |
| 2/17/2010 |
Meeting or Teleconference Held |
DEC met with Arcadis and Chevron to discuss activities for the site in 2010. Additional plume delineation will be performed by adding 3 monitoring wells. One of these wells will be located on the Hotfoot property. The eco scoping guidance will be used to evaluate potential ecological impacts to the pond adjacent to the site. Sediment and surface water will be collected from the pond in 2010. A work plan will be submitted prior to all work. |
Tamara Cardona-Marek |
| 6/29/2010 |
Update or Other Action |
Site lessee plans to install a greywater tank on site. Installation is being coordinated with Chevron and Arcadis to make sure that any excavated soil is screened and contaminated soil is treated appropriately. |
Tamara Cardona-Marek |
| 8/13/2010 |
Document, Report, or Work plan Review - other |
DEC received and commented on workplan for additional plume delineation and eco evaluation to assess impacts of contamination into the airport pond.
|
Tamara Cardona-Marek |
| 8/26/2010 |
Site Visit |
Staff visited the site while addiitonal monitoring wells were installed and to meet with UAF, Chevron, and Arcadis to discuss the use of the site for a research study on phyto-remediation. |
Tamara Cardona-Marek |
| 9/30/2010 |
Offsite Soil or Groundwater Disposal Approved |
Request for transport and disposal at ASR of investigative derived waste approved. |
Tamara Cardona-Marek |
| 10/11/2010 |
Document, Report, or Work plan Review - other |
DEC received the First Semi-Annual 2010 Groundwater Monitoring Report. Concentrations of DRO and GRO are consistent with prior monitoring events. LNAPL present in MW-3, MW-4, MW-9 and RW-1. Sampled for sulfolane with no detections. |
Tamara Cardona-Marek |
| 7/1/2011 |
Document, Report, or Work plan Review - other |
DEC received and reviewed the 2011 Work Plan for Additional Assessment submitted by Arcadis.
Plan proposes to install and sample 14 soil borings installed with a hand auger to a depth of 8 feet to assess shallow soils. |
Tamara Cardona-Marek |
| 7/28/2011 |
Site Characterization Report Approved |
2011 Work Plan for Additional Assessment is approved. |
Tamara Cardona-Marek |
| 9/14/2011 |
Document, Report, or Work plan Review - other |
DEC received and reviewed the 2010 Site Assessment Report and the 2011 First Semi-Annual Groundwater Monitoring Report. Results for the site assessment indicate free product is found across the road on the well located southeast of the site (MW-12) This is due to the nature of the groundwater gradient (flat). Site assessment also revealed highest contamination on surface soil samples collected at a depth of 2 ft, confirming that contamination is due to spills from the historic above ground storage tanks. |
Tamara Cardona-Marek |
| 12/21/2011 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75293 Former AST Bulk Fuel Taks & Distribution Sys. . |
Tamara Cardona-Marek |
| 12/28/2011 |
Site Characterization Report Approved |
DEC received and reviewed the 2011 Site Assessment submitted by Arcadis. Report indicates that contaminants are found in the surface soil at depths as shallow as 1.5-2 feet, consistent with spills from above ground storage tanks. DEC has requested that Chevron submits a cleanup plan to remediate and/or mitigate contamination posing current risks to human health and the environment. |
Tamara Cardona-Marek |
| 1/9/2012 |
Document, Report, or Work plan Review - other |
DEC received and reviewed the Second Semi Annual 2011 Groundwater Monitoring Report. GRO, DRO and benzene exceeded the cleanup levels in wells MW-7, MW-8 and MW-12. Ethylbenzene also exceeded cleanup levels in MW-12. LNAPL was found in wells MW-1 through MW-4, MW-6, MW-9 and RW-1. |
Tamara Cardona-Marek |
| 6/19/2012 |
Document, Report, or Work plan Review - other |
DEC received and reviewed the 2012 Groundwater Monitoring Workplan from Arcadis. |
Tamara Cardona-Marek |
| 7/30/2012 |
Document, Report, or Work plan Review - other |
DEC received and reviewed the Work Plan for LNAPL Mobility Assessment. |
Tamara Cardona-Marek |
| 8/28/2012 |
Meeting or Teleconference Held |
DEC met with Chevron and Arcadis to discuss actions for 2012-2013. An updated conceptual site model will be submitted that addresses exposure pathways and how they will be remediated or controlled. This will comprise the cleanup plan that is expected to be submitted in the Fall of 2012.
Use of dataloggers was suggested for this site to obtain a year -round trend. |
Tamara Cardona-Marek |
| 9/7/2012 |
Document, Report, or Work plan Review - other |
DEC received and reviewed the First Semi Annual 2012 Groundwater Monitoring Report from Arcadis. Results are consistent with previous monitoring events. No trends documented in the conclusions. Several wells contained free product. |
Tamara Cardona-Marek |
| 4/29/2013 |
Meeting or Teleconference Held |
DEC, Arcadis, and Chevron met to discuss the status of several Fairbanks area Chevron sites. Arcadis will install more wells at FIA Saupe to delineate the extent of the plume to the northeast. Dataloggers will be installed in monitoring wells to monitor the water levels over a longer period of time to get a better idea of the groundwater gradient and how it changes seasonally. Fingerprinting results indicate that the LNAPL on site is a mix of Aviation gas and jet fuel. Active remediation will likely include soil removal in the upper 2 feet around SB-1 and SB-2, followed by air sparging and soil vapor extraction (AS/SVE) to target the GRO and BTEX fraction of the contamination, and MNA for DRO. Upcoming reports will include an updated CSM, trend analyses, and a LNAPL mobility assessment. |
Robert Burgess |
| 6/6/2013 |
Update or Other Action |
Site symbol visually adjusted using ArcGIS and satellite imagery. |
Robert Burgess |
| 6/10/2013 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75293 Former AST Bulk Fuel Taks & Distribution Sys. . |
Robert Burgess |
| 6/13/2013 |
Site Visit |
Site visit to observe groundwater sampling. Sampling for VOCs (incl. EDB), BTEX, and DRO was conducted with hydrasleeves. |
Robert Burgess |
| 7/17/2013 |
Site Characterization Workplan Approved |
2013 Work Plan for Additional Assessment approved with modifications. ARCADIS proposed to install several soil borings to further delineate the vertical and horizontal extent of soil contamination to the northwest of Lot 12 (on lots 15A and B, the former Hotfoot building; file #100.26.102) and to characterize the vertical extent of soil contamination near MW-8. Modifications required by DEC include increasing the depth of initial borings from 8 to 10 feet (14 feet if high PID at 10ft) because previous reports document no impacts above 8 ft. DEC also recommended to follow up this work with the installation of new monitoring wells during this field season. Email chain including plan modifications is documented in the site file. |
Robert Burgess |
| 7/23/2013 |
Site Visit |
DEC conducted a site visit to observe soil sampling via hand augering (0-8 ft) and geoprobe (8-20 ft). Field screening and soil sampling was conducted by qualified personnel following the approved workplan. Previous geotechnical surveys had detected anomalies, one of which was beneath a planned boring location. At this location (and others), refusal was encountered before the boring was completed, but the reason for refusal was unclear. Chevron plans to use a vacuum truck for further investigation and to complete borings. |
Robert Burgess |
| 8/14/2013 |
Site Characterization Workplan Approved |
DEC approved an addendum to the 2013 Work Plan for Additional Assessment. Borings that were unable to be completed will be investigated with a vacuum truck to the water table or to 8 feet below ground surface, and completed, if possible, by hollow stem auger. Soil samples will be collected, field screened and sampled. Two downgradient wells may be installed depending on field screening results. |
Robert Burgess |
| 8/19/2013 |
Site Visit |
DEC project manager conducted a site visit to observe completion of borings via vacuum truck that were previously not able to be hand augered and for utility clearance. Soil samples were also taken at intervals via a hand auger. After leaving the site, received notification that a corrugated metal tank and some type of conduit were discovered at 3.5 feet in one boring that was being completed over an anomaly previously detected during a geophysical survey. |
Robert Burgess |
| 8/21/2013 |
Site Visit |
DEC project manager visited the site to watch the installation of monitoring wells and completion of soil borings. |
Robert Burgess |
| 2/13/2014 |
Document, Report, or Work plan Review - other |
DEC reviewed the Second Semi-annual 2013 Groundwater Monitoring Report. LNAPL was present in several wells; LNAPL and analytical data were generally consistent with historical sampling results, as was the groundwater gradient. |
Robert Burgess |
| 5/12/2014 |
Site Visit |
DEC project manager visited the site to observe installation of soil borings and monitoring wells and associated sampling activities. |
Robert Burgess |
| 5/14/2014 |
Meeting or Teleconference Held |
DEC met with Chevron and ARCADIS to discuss the status of several Fairbanks area Chevron sites. Work from the 2013 field season indicated that the extent of floating product was greater than previously thought. Field work for the 2014 field season is underway and is targeted at complete delineation of product. When product is delineated, Chevron will begin work on a remedial system design to target low molecular weight, volatile fuel components. |
Robert Burgess |
| 2/27/2015 |
Document, Report, or Work plan Review - other |
DEC reviewed the 2015 Cleanup Plan describing excavation of contaminated surface soil and the installation of an air sparge/soil vapor extraction (AS/SVE) system to target volatile organic contaminants and gasoline range organics and the use of institutional controls to prevent exposure at the site. |
Robert Burgess |
| 4/9/2015 |
Site Characterization Workplan Approved |
DEC reviewed and approved the 2015 Work Plan for Additional Site Assessment. The work plan describes additional soil borings intended to delineate the extent of surface soil contamination in preparation for remedial excavation as proposed in the 2014 Cleanup Plan. |
Robert Burgess |
| 7/10/2015 |
Document, Report, or Work plan Review - other |
DEC reviewed the first semi-annual 2015 Groundwater Monitoring Report. LNAPL was present in several wells, consistent with historical data. The dissolved phase plume remains similar in concentrations compared to past events. |
Robert Burgess |
| 1/11/2016 |
Document, Report, or Work plan Review - other |
DEC reviewed the Second Semi-annual 2015 Monitoring Report. Contamination is relatively consistent with past monitoring events, with LNAPL present in several wells as well as dissolved fuels and benzene. Remediation planning is still underway. |
Robert Burgess |
| 10/6/2016 |
Meeting or Teleconference Held |
Meeting with RP and consultant on multiple Chevron sites to discuss current site status and upcoming site action. |
Shawn Tisdell |
| 1/23/2018 |
Meeting or Teleconference Held |
DEC staff met with DOT staff to discuss general coordination of contaminated site issues regarding leased properties at the Fairbanks International Airport and specific site information including cleanup activity status and upcoming work or proposed state action. |
Shawn Tisdell |
| 6/5/2018 |
Document, Report, or Work plan Review - other |
DEC received a report titled "2018 Air Sparge and Soil Vapor Extraction Well Installation Work Plan" This proposed work plan outlines phase one of a three phase work scope. Phase I includes the installation of the air sparge/soil vapor extraction (AS/SVE) wells and is scheduled for the summer of 2018. |
Shawn Tisdell |
| 6/12/2018 |
Meeting or Teleconference Held |
Meeting held with RP and consultants to discuss site progress and outline future site action. |
Shawn Tisdell |
| 7/2/2018 |
Document, Report, or Work plan Review - other |
"2018 Air Sparge and Soil Vapor Extraction Well Installation Work Plan" reviewed and approved. System installation scheduled to begin 7/9/2018 |
Shawn Tisdell |
| 8/30/2018 |
Offsite Soil or Groundwater Disposal Approved |
Transport approval provided for 9 CY of contaminated soil and 460 gal of water removed during the installation of monitoring wells on the site. |
Shawn Tisdell |
| 11/8/2018 |
Meeting or Teleconference Held |
DEC staff met with Chevron and ARCADIS representatives to determine site status and discuss the path forward for multiple sites. Chevron is in the process of transferring site managers from GHD to ARCADIS. |
Shawn Tisdell |
| 3/12/2019 |
Meeting or Teleconference Held |
DEC and DOT staff met to discuss progress and potential future cleanup action at this site. |
Shawn Tisdell |
| 5/3/2019 |
Document, Report, or Work plan Review - other |
The DEC has determined that the work plan submitted for this site does not meet the minimum requirements as defined in DEC guidance and has requested that it be revised. |
Shawn Tisdell |
| 7/3/2019 |
Document, Report, or Work plan Review - other |
DEC received Second Semi-annual 2018 Groundwater Monitoring Report which will be under review. Report conclusion indicates that the analytical results, groundwater elevations, flow direction, and gradient from the second 2018 semiannual groundwater monitoring events are generally consistent with historical trends. |
Shawn Tisdell |
| 8/9/2019 |
Meeting or Teleconference Held |
DEC staff met with Arcadis and Chevron representatives to discuss the current status and upcoming site cleanup goals for this site. |
Shawn Tisdell |
| 10/17/2019 |
Site Characterization Workplan Approved |
Approval to excavate shallow soil (provided 10/9/2019) and install air sparge wells as outlined in the 2019 Shallow Soil Excavation and System Installation Work Plan was provided by the department. ADEC comments have been submitted to the RP requesting additional details or clarifications to the portion of the work plan detailing installation of the air sparge and soil vapor extraction system. |
Shawn Tisdell |
| 10/17/2019 |
Site Visit |
Site visit to observe groundwater sampling event and shallow soil removal activities. |
Shawn Tisdell |
| 11/4/2019 |
Offsite Soil or Groundwater Disposal Approved |
Agency approval to dispose of nine 55-gallon drums (495 gallons) of waste water and twelve supersacks (12 cubic yards) of contaminated soil. the soil will be disposed at Organic incineration Technology, Inc. in Moose Creek, AK and the waste water will be disposed by NRC Alaska LLC at Arlington, Oregon. |
Shawn Tisdell |
| 11/7/2019 |
Meeting or Teleconference Held |
DEC staff met with Arcadis staff to discuss the site and determine cleanup goals for the site. |
Shawn Tisdell |
| 8/21/2020 |
Document, Report, or Work plan Review - other |
DEC staff reviewed 2020 Remedial action plan which outlines the third phase of preparation of mitigation system installation. This work includes system mobilization, installation, startup and monitoring of the soil vapor extraction (SVE) and air sparge (AS) system. To avoid potentially mobilizing free product, the AS portion of the system will only be operated after free product has been reduced and approval is provided by the DEC. Work associated with Phase I and Phase II, included installation of the air sparge and soil vapor extraction wells and a limited excavation of impacted surface soil, has been completed. |
Shawn Tisdell |
| 9/23/2020 |
Offsite Soil or Groundwater Disposal Approved |
An estimated 10 cubic yards of potentially impacted surface soil will be excavated in preparation for installation of a concrete slab for the mitigation system building. Contaminants of concern are GRO, DRO, EDB, BTEX, and PFAS. THe soil will be transported to the Organic Incineration Technology. Inc. facility in Moose Creek, AK. |
Shawn Tisdell |
| 11/6/2020 |
Update or Other Action |
A concrete slab was installed directly on the proposed location where the AS/SVE building will be installed. The location was level, so soil excavation was deemed not necessary. No potentially impacted soil that may have required treatment,was excavated. |
Shawn Tisdell |
| 1/15/2021 |
Meeting or Teleconference Held |
DEC staff met with Chevron Environmental Management Company (CEMC) and Arcadis to discuss Chevron sites located in Alaska during the Annual Portfolio Meeting on January 14th and 15th, 2021. |
Rebekah Reams |
| 5/11/2021 |
Document, Report, or Work plan Review - other |
DEC provided a comment letter requesting additional information regarding site groundwater monitoring reports, including additional information on investigation derived waste management, groundwater gradient, and discussion of headspace present in analytical samples collected during the 2019 Second Semi-Annual Groundwater Monitoring event. |
Rebekah Reams |
| 8/9/2021 |
Document, Report, or Work plan Review - other |
DEC provided comments on the Site Groundwater Monitoring Work Plan. This work plan proposes to establish semi-annual groundwater sampling of site monitoring wells. |
Rebekah Reams |
| 8/10/2021 |
Document, Report, or Work plan Review - other |
DEC provided comments on the Work Plan for Additional Assessment. This work plan proposes to advance three groundwater monitoring wells to further define the extent of contamination downgradient of the site. |
Rebekah Reams |
| 10/14/2021 |
Cleanup Plan Approved |
DEC approved the Remedial Action Plan with addendum following comment resolution. This plan proposes the remedial design, installation, and operation of a soil vapor extraction system at the site. |
Rebekah Reams |
| 10/14/2021 |
Document, Report, or Work plan Review - other |
DEC reviewed the final version of the Field Summary Report – 2018 and 2019 with addendum which documents the installation of Air Sparge (AS) and Soil Vapor Extraction (SVE) wells and the excavation of surface soil completed in 2018 and 2019. |
Rebekah Reams |
| 12/14/2021 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75293 Former AST Bulk Fuel Taks & Distribution Sys. . |
Rebekah Reams |
| 2/16/2022 |
Document, Report, or Work plan Review - other |
DEC approved the Addendum to the Work Plan for Additional Assessment submitted on December 8, 2021. This work plan proposes to advance additional groundwater monitoring wells to further define the extent of contamination downgradient of the site. |
Rebekah Reams |
| 2/16/2022 |
Document, Report, or Work plan Review - other |
DEC approved the Addendum to the Site Groundwater Monitoring Work Plan submitted on December 8, 2021. This work plan establishes semi-annual groundwater sampling of monitoring wells at the site. |
Rebekah Reams |
| 10/7/2022 |
Offsite Soil or Groundwater Disposal Approved |
DEC approved transport of 1,000 lbs of purge and decontamination water and 12,000 lbs of soil cuttings generated in November 2021 and September 2022. |
Rebekah Reams |
| 2/21/2023 |
Document, Report, or Work plan Review - other |
DEC received the 2022 Well Installation Report which documents the installation of monitoring wells MW-22, MW-23, and MW-24 downgradient of the site. Following a preliminary review of the report, ADEC provided concurrence with the recommendations outlined in Section 8, which propose a work plan be submitted to define the downgradient groundwater impacts by installing additional monitoring wells within accessible areas of the adjacent property northwest of the site. |
Rebekah Reams |
| 6/26/2023 |
Document, Report, or Work plan Review - other |
ADEC approved the Additional Offsite Delineation Work Plan following comment resolution. This work plan proposes to advance additional soil borings and groundwater monitoring wells to further define the extent of contamination downgradient of the site. |
Rebekah Reams |
| 7/17/2023 |
Long Term Monitoring Workplan or Report Review |
ADEC approved the Groundwater Assessment and Well Installation Work Plan - Revision 1 following comment resolution. This work plan proposes to decommission damaged monitoring wells MW-8 and MW-19 if they cannot be repaired, replace monitoring well MW-8, and update the analytes included in the groundwater monitoring plan. |
Rebekah Reams |
| 10/10/2023 |
Document, Report, or Work plan Review - other |
ADEC reviewed the Well Decommissioning and Installation Report – 2023 which documents the decommissioning monitoring well MW-8, installation of replacement well MW-8R, and the collection of analytical soil and groundwater samples. MW-19 was scheduled for repair or replacement, but was not able to be located. |
Rebekah Reams |
| 1/8/2024 |
Long Term Monitoring Workplan or Report Review |
2023 Second Semi-Annual Groundwater Monitoring event was conducted on October 6 and 7, 2023. Samples were collected from monitoring wells MW-1, MW-2, MW-4, MW-5, MW-6, MW-7, MW-8R, MW-9, MW-10, MW-11, MW-12, MW-13, MW-14, MW-15, MW-16, MW-17, MW-18, MW-20 through MW-29, and RW-1 were submitted for GRO, DRO, RRO, select VOCs, PAHs, and lead analysis. Monitoring well MW-3, MW-17, and RW-1 were not sampled due to the presence of LNAPL. Depth to groundwater was 4.97 to 13.90 feet below ground surface and groundwater flow direction was to the northwest. |
Rebekah Reams |
| 1/8/2024 |
Long Term Monitoring Workplan or Report Review |
2023 Fourth Quarter O&M report summarizes the monitoring activities of the soil vapor extraction system from September 25, 2023 to November 2, 2023. Approximately 148 pounds of GRO were recovered by the SVE system during the fourth quarter 2023 and the average mass recovery rate was approximately 21.4 lbs/day. The cumulative mass of GRO removed from the subsurface since system startup is approximately 3,185 pounds. |
Rebekah Reams |
| 8/6/2024 |
Long Term Monitoring Workplan or Report Review |
2024 First Semi-Annual Groundwater Monitoring event was conducted in May 2024. Samples were collected from monitoring wells MW-1, MW-2, MW-4, MW-5, MW-6, MW-7, MW-8R, MW-9 through MW-16, MW-18, MW-20 through MW-29, and RW-1 were submitted for GRO, DRO, RRO, select VOCs, PAHs, and lead analysis. Monitoring well MW-3, MW-17, and RW-1 were not sampled due to the presence of LNAPL. Depth to groundwater was 6.88 to 15.45 feet below ground surface and groundwater flow direction was to the northeast.
|
Rebekah Reams |
| 9/25/2024 |
Meeting or Teleconference Held |
ADEC staff met with Chevron and their consultant for an annual portfolio meeting to discuss site status, upcoming document submittals, pending reviews, and general updates for Chevron's contaminated sites throughout the state. |
Rebekah Reams |
| 10/8/2024 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approved transport of 165 gallons of purged groundwater from groundwater monitoring and soil vapor extraction system maintenance generated in May 2024. |
Rebekah Reams |
| 10/30/2024 |
Long Term Monitoring Workplan or Report Review |
2024 Second Quarter O&M report summarizes the monitoring activities of the soil vapor extraction system from May 28, 2024 to June 3, 2024. Approximately 215 pounds of GRO were recovered by the SVE system during the second quarter 2024 and the average mass recovery rate was approximately 45.6 lbs/day. The cumulative mass of GRO removed from the subsurface since system startup is approximately 3,400 pounds.
|
Rebekah Reams |
| 10/30/2024 |
Long Term Monitoring Workplan or Report Review |
2024 Third Quarter O&M report summarizes the monitoring activities of the soil vapor extraction system from July to September 2024. Approximately 766 pounds of GRO were recovered by the SVE system during the third quarter 2024 and the average mass recovery rate was approximately 11.5 lbs/day. The cumulative mass of GRO removed from the subsurface since system startup is approximately 4,166 pounds. |
Rebekah Reams |
| 10/30/2024 |
Document, Report, or Work plan Review - other |
DEC reviewed the 2023 Well Installation Report which documents the advancement of soil boring and installation of monitoring wells MW-25 through MW-27, and MW-29 to define the downgradient extent of the plume. This work was completed in September 2023 and analytical results indicated DRO was present above migration to groundwater cleanup levels in soil boring SB-27B and groundwater cleanup level exceedances were observed in monitoring wells MW-26, MW-27, and MW-28. All site monitoring wells were surveyed during this site characterization event.
The report concluded that the downgradient extent of contamination has not been defined and recommends ongoing semi-annual groundwater monitoring data be used to further evaluate groundwater quality and concentration trends and help inform the next steps for characterization at this site. During the September 24th, 2024 annual portfolio meeting, DEC concurred with these recommendations and requested that upcoming groundwater monitoring reports include recommendations for future site characterization based on the additional groundwater data collected following well installation.
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Rebekah Reams |
