| Action Date |
Action |
Description |
DEC Staff |
| 1/1/1985 |
Update or Other Action |
(Old R:Base Action Code = SI - Site Investigation). In 1985, Ecology and Environment, Inc. was contracted by Chevron to do a PCB contamination grid survey, sampling and PCB analysis to determine the extent of contamination. |
Former Staff |
| 5/24/1988 |
Update or Other Action |
(Old R:Base Action Code = PER - Permit Action at Site). Air Quality Control Permit to Operate #8823-AA004 for a transportable circulating bed combustor to thermally stabilize PCB-contaminated soil at Swanson River Oil Field near Sterling. |
Former Staff |
| 7/12/1988 |
Update or Other Action |
(Old R:Base Action Code = SI - Site Investigation). Ecology and Environment conducted a geophysical survey to identify possible areas of buried drums. Six target areas were determined. A report was submitted on 7/19/88. |
Former Staff |
| 9/1/1988 |
Update or Other Action |
(Old R:Base Action Code = SI - Site Investigation). Ecology and Environment performed a petroleum contamination study at the site. Numerous soil borings and monitoring wells were used to collect soil and water samples. Two source area were identified, having high total BTEX concentrations (up to 2,000 ppm in soil). Floating product observed in several monitoring wells. |
Former Staff |
| 9/24/1988 |
Update or Other Action |
(Old R:Base Action Code = F - Site Treatment, Soil/H2O). Ogden Environmental conducted a test run to thermally destroy PCBs in soil up to 50 ppm. Operated under ADEC permit #8823-AA004. PCB reduction reportedly up to 99%. Thermal destruction consists of a circulating bed combustion unit. Extensive pre and post soil sampling conducted, as well as emissions and ash analyses. The test run was considered a success. |
Former Staff |
| 9/30/1988 |
Notice of Violation |
P. Williams, State Electrical Inspector, reported 46 electric violations at facility to K. Ballard. Ogden given 30-60 days to comply. |
Kirsten Ballard |
| 10/21/1988 |
Notice of Violation |
KDO issued two NOVs to Ogden for small spills from fuel tank and improper disposal of waste oil. Martec, Ogden's subcontractor, passed inspection for cleaning up spilled waste oil/diesel fuel. |
Former Staff |
| 1/5/1989 |
Site Characterization Report Approved |
(Old R:Base Action Code = SI - Site Investigation). Alliance Technologies Corp. final report. |
Former Staff |
| 1/5/1989 |
Update or Other Action |
(Old R:Base Action Code = SI - Site Investigation). Submitted draft historical report. |
Kirsten Ballard |
| 2/6/1989 |
Notice of Violation |
ADEC issued Ogden Environmental a NOV for unlawfully handling materials without taking reasonable precautions to prevent particulate matter from becoming airborne. The situation was corrected and no additional remediation was necessary. |
Former Staff |
| 4/1/1989 |
Update or Other Action |
(Old R:Base Action Code = F - Site Treatment, Soil/H2O). Ogden burning PCB contaminated soil. |
Former Staff |
| 6/1/1989 |
Update or Other Action |
(Old R:Base Action Code = PER - Permit Action at Site). In June 1989, Ogden Environmental received a final nationwide EPA TSCA permit approving Odgen's method of thermal destruction for PCB contaminated materials with up to 600 ppm PCBs. |
Former Staff |
| 6/2/1989 |
Update or Other Action |
(Old R:Base Action Code = PER - Permit Action at Site). Air Quality Control Permit to Operate #8923-AA002 for the CBC at Swanson River Oil Field. |
Former Staff |
| 7/12/1989 |
Notice of Violation |
NOV issued to Ogden Environmental for unlawfully burning PCB-contaminated soil greater than 40 ppm PCBs without limestone feeding (ADEC permit requirement). The limestone is used when PCB concentrations are above 40 ppm to prevent the formation of hydrochloric acid. This also violated the EPA TSCA permit. EPA took over enforcement, but did not issue a fine since the emissions did not exceed allowable limits. |
Former Staff |
| 8/3/1989 |
Notice of Violation |
NOV issued. |
Former Staff |
| 9/28/1989 |
Update or Other Action |
Drawings and map of area received by KDO 9/28/89, plus interim report. |
Former Staff |
| 9/3/1990 |
Site Number Identifier Changed |
Old Reckey 19852X0117501. Changed to reflect correct workplan. Also, Kenai Special Project code eliminated. |
Former Staff |
| 12/12/1990 |
Site Ranked Using the AHRM |
Initial ranking. |
Former Staff |
| 2/21/1991 |
Update or Other Action |
As specified in section 3, page 5, Consent Agreement, Arco sent in summary of activities for January 1991. Incineration of (PCB) contaminated soil in CBC unit continued through 1/91. As of 2/2/91, cumulative total of 60,435 tons of contaminated material has been incinerated with 26,373 tons remaining. |
Former Staff |
| 1/1/1992 |
Site Added to Database |
Hydrocarbons and PCB contamination. |
Former Staff |
| 3/10/1992 |
Update or Other Action |
(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). ADEC provided approval of ARCO's request to dispose of approximately 274 cubic yards of remediated contaminated soil. |
Former Staff |
| 11/30/1992 |
Update or Other Action |
Ogden finished remediating all of the excavated PCB soil and shut down the operations of their incinerator on July 3, 1992. The estimated amount of remediated material is 106,000 tons of PCB contaminated soil. Ogden has decontaminated all of their equipment and moved off site. |
Former Staff |
| 8/11/1993 |
Update or Other Action |
(Old R:Base Action Code = RAU - Remedial Actions Underway (General)). OES completed remediating all excavated PCB contaminated soils for a grand total of 106,000 tons. The final site sampling has been conducted and the department is waiting for the results to be submitted. |
Former Staff |
| 11/30/2000 |
Institutional Control Record Established |
All of the PCB contaminated soils except those under buildings and piping that couldn't be removed has been excavated and incinerated at the Ogden CBC combustor. The project is almost completed and is scheduled for closing down in July 1992. Ogden has incinerated over 93,000 tons of PCB contaminated soils. The remaining PCB contaminated soils will be remediated in-situ or after facility closeout and the buildings removed. Final Closure of this site dependent on closure of the Swanson River Compressor Plant (Reckey 1991230125001) and Swanson River P&S Yard (Reckey 1988230118301) sites per COBC. |
Donald Seagren |
| 11/30/2000 |
Conditional Closure Approved |
All of the PCB contaminated soils except those under buildings and piping that couldn't be removed has been excavated and incinerated at the Ogden CBC combustor. The project is almost completed and is scheduled for closing down in July 1992. Ogden has incinerated over 93,000 tons of PCB contaminated soils. The remaining PCB contaminated soils will be remediated in-situ or after facility closeout and the buildings removed. Final Closure of this site dependent on closure of the Swanson River Compressor Plant (Reckey 1991230125001) and Swanson River P&S Yard (Reckey 1988230118301) sites per COBC. |
Donald Seagren |
| 12/1/2000 |
Site Number Identifier Changed |
Changed the Workplan from 01 to 09 to reflect PCB contamination. |
Donald Seagren |
| 12/5/2000 |
Site Ranked Using the AHRM |
Changed Population Density Value from 0 to 3. |
Former Staff |
| 4/28/2004 |
Update or Other Action |
File number assigned and entered into the Fileroom DB and CS DB. |
Alyce Hughey |
| 8/9/2004 |
Update or Other Action |
Reviewed March 88 USFWS PCB report on removal of PCBs from KNWR, October 1984-1988 |
Donald Seagren |
| 10/7/2005 |
GIS Position Updated |
Using Figure 1 from a Mitigation and Restoration Plan for PCB's at The Swanson River Field, from Ecology and Environment, Inc., dated April 1987, in conjunction with TopoZone Pro and the KPB Parcel Lookup, entered the coordinates for this site. Metadata includes No Topo Basemap, TopoZone Pro Street Maps, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinate Datum, NAD83. High degree of confidence in accuracy of location. |
Alyce Hughey |
| 5/7/2007 |
Exposure Tracking Model Ranking |
|
Donald Seagren |
| 6/11/2008 |
Update or Other Action |
Site transferred from Don Seagren to Paul Horwath per Linda Nuechterlein. On 6-30-08 transferred from Paul Horwath to Don Fritz per Paul Horwath. |
Alyce Hughey |
| 11/15/2011 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 71155 release tested positive for pcb. |
Alyce Hughey |
| 11/16/2011 |
Update or Other Action |
Site transferred from Don Fritz to Peter Campbell per Paul Horwath. |
Alyce Hughey |
| 12/19/2011 |
Document, Report, or Work plan Review - other |
Reviewed the Plant 10 Abandonment Phase I Completion Report 2011 Activities Swanson River Field, dated November 29, 2011, from Chevron North America Exploration and Production. The Phase I Plant 10 Abandonment Project began on June 27, 2011 and was completed on November 1, 2011. Ten areas were removed above the concrete slab and ground surface within the existing Compressor Plant footprint (E-7, E-8, and E-9 Building), (C-4 Regenerator Skid), (P.S. K-5 Skid), (Deethanizer Skid), (LTS Skid #1), (LTS Skid #2), (K-1 Skid), (K-2 Skid), (K-3 Skid), and (Misc. associated exterior pipes). Once the structures were removed and the concrete slabs cleaned, the slabs were sampled and analyzed for PCB contamination; then a polypropylene geotextiele waterproof sealant was installed over slabs P.S. K-5 Skid, Deethanizer Skid, LTS Skit #1, and LTS Skid #2. The final remediation of PCB contaminated soils will be initiated at the time of facility abandonment identified in Amendment Number 4 to the August 1985 Compliance Order by Consent. |
Alyce Hughey |
| 2/24/2014 |
Document, Report, or Work plan Review - other |
Reviewed the 2013 Compressor Plant 10 PCB Monitoring Report, dated February 12, 2014, prepared by AECOM Technical Services, Inc. During the 2013 PCB groundwater samplings conducted on June 26, 2013 and October 15, 2013, all monitoring wells tested did not detect PCB’s within the samples taken. The depth to groundwater was 4.73 to 7.43 feet on June 26, 2013 and 5.6 to 10.01 feet on October 15, 2013. The groundwater was flowing northwest/westerly. |
Alyce Hughey |
| 2/26/2015 |
Update or Other Action |
The Alaska Department of Environmental Conservation has received the 2014 Compressor Plant 10 PCB Monitoring Report. We noted the consultant requests that PCB sampling and analysis be suspended at Plant 10. This sampling is required under a Compliance Order By Consent signed by the US Fish and Wildlife Service, BLM, ADEC and Chevron. Modifications to the approved sampling plan or PCB cleanup plan would require a formal modification to the compliance order. It is our understanding that the USFWS is the lead agency for this work. If you wish to modify the sampling schedule, the compliance order will need to be amended. Until the compliance order is amended, we are requiring continued monitoring compliance. |
Peter Campbell |
| 2/25/2016 |
Update or Other Action |
An ethylene glycol/water mixture release occurred on November 3, 2015 at the northeast corner of the Compressor Plant operated by Hilcorp. The release was to ground adjacent to Tank 201 and into secondary containment. The release was from failed discharge flanges on glycol pumps and tears in the containment liner allowed the liquid to spill to ground. Surface soils were excavated removing visibly observable glycol-impacted soils until frozen ground was encountered. Excavation ranged from 3 to 12 inches below grade. Recovered soils were placed in 8 super sacks. Samples from the excavation detected Aroclor-1254 at 9.21 mg/kg. A sample was collected from one of the eight supersacks for waste characterization. The PCB detection in this waste sample was 12.3 mg/kg for Aroclor-1260. Two additional samples were collected and Aroclor-1248 was detected at 32 mg/Kg and 0.333 mg/kg. Gravel has been placed in the excavation. A fence restricts both human and wildlife entry. Chevron has been contacted and in the interim, Hilcorp is developing a plan addressing PCB-contaminated soil in the vicinity of the glycol release. |
Peter Campbell |
| 3/2/2016 |
Update or Other Action |
Hilcorp Alaska LLC., the current field operator had an ethylene glycol/water mixture release on November 3, 2015 at the northeast corner of the Swanson River Compressor Plant. The release was to ground directly adjacent to Tank 201 and to its adjacent overflow secondary containment, which was not completely intact. Excavation was conducted until frozen ground was encountered between 3 to 12 inches below grade. Excavated soils (eight cubic yards) were placed in super sacks. One excavation confirmation soil sample was collected on November 16, 2015 at the south end of the release area which detected Aroclor-1254 at 9.210 mg/kg. A grab sample was collected from three of the eight super sacks for waste characterization purposes. The PCB detection was 12.3 mg/kg for Aroclor-1260, Aroclor-1248 was detected at a concentration of 32 mg/Kg and 0.333 mg/Kg. To rule out the presence of PCBs in the Compressor Plant glycol/water circulation system, a sample of the circulation fluid was collected on 1/28/16 and analyzed for PCBs. The results were non-detect. |
Peter Campbell |
| 3/24/2016 |
Update or Other Action |
Letter sent to Hilcorp: Notification of Hazardous Substance Release Reporting Requirements. Hilcorp discovered elevated levels of PCB's while cleaning up a glycol spill. The PCB's are likely from a historical release. Hilcorp waited approximately two months from when the PCB's were found in analytical samples until they reported the finding to ADEC. |
Peter Campbell |
| 4/26/2016 |
Update or Other Action |
A letter was sent to Hilcorp stating that Hilcorp Alaska violated the hazardous substance notification and reporting requirements of 18 AAC 75.300 by delaying notification to the department more than 2 months after having knowledge that PCB concentrations at a glycol release at the compressor plant exceeded the Compliance Order By Consent cleanup level of 12 mg/kg in soil. This applies whether these PCBs are from the historic PCB releases identified in the 1980s, or any PCB releases which may have occurred since that time. |
Peter Campbell |
| 9/9/2016 |
Meeting or Teleconference Held |
Teleconference with Hilcorp, Chevron, Weston AECOM, BLM, USFWS and ADEC to discuss work plan that will be used to begin assessing PCB's encountered at a glycol release site on the north east side of the compressor plant building. Modifications were made to the plan, that will be revised next week, with an effort to begin field work as soon as possible |
Peter Campbell |
| 9/28/2016 |
Site Characterization Workplan Approved |
Work plan approval issued for assessment of glycol and PCB contamination at the site of a glycol release. |
Peter Campbell |
| 12/21/2016 |
Update or Other Action |
Site Characterization Report for PCB and glycol sampling received. |
Peter Campbell |
| 1/20/2017 |
Site Visit |
Site visit to Pad 14-3 to observe monitoring well locations. The COBC requires that wells on this pad be sampled annually. |
Peter Campbell |
| 2/1/2017 |
Update or Other Action |
In reviewing the Compliance Order By Consent it was determined that Groundwater was to be sampled at SCU 14-3, the pad where PCB's were stockpiled and remediated. We have requested that Chevron develop a work plan to conduct groundwater monitoring at this pad. |
Peter Campbell |
| 2/1/2017 |
Document, Report, or Work plan Review - other |
We have completed our review of the PCB Site Characterization Report at the Glycol Release, and find the assessment work to be sufficient to identify the extent of the PCB impacts at the location of the glycol spill. ADEC has requested a cleanup work plan for the removal of PCB impacted soils. |
Peter Campbell |
| 3/1/2017 |
Document, Report, or Work plan Review - other |
Reviewed and approved the Work Plan Addendum (Feb 20, 2017) for further assessment of glycol at the north west side of the former Plant 10 excavation for a glycol spill. One confirmation sample had glycol that exceeded the migration to groundwater cleanup levels. Further assessment will delineate the extent of glycol contamination in preparation for cleanup work of both glycol and PCBs this summer. |
Peter Campbell |
| 5/1/2017 |
Document, Report, or Work plan Review - other |
Review and approval of PCB Cleanup Work Plan (April 24, 2017). Approve additional soil removal from six grid cells. Two of the cells had PCB soil concentrations that will require soil be sent to a TSCA soil disposal facility. Remaining soils (below 10 mg/kg) will be sent to the Kenai Peninsula Borough Landfill |
Peter Campbell |
| 5/3/2017 |
Site Visit |
Observe surface conditions of sample locations and monitoring wells. Also visit Pad 14-3 to determine status of monitoring wells. |
Peter Campbell |
| 5/22/2017 |
Document, Report, or Work plan Review - other |
Approved "Cable Tray Installation Excavation Activities Work Plan" that covers excavation, storage and sampling and disposal of soils potentially contaminated with PCBs. Approximately 11 cubic yards of soil will be excavated and stored in super sacks. The soils will be sampled, and if PCBs are detected at concentrations above 1 ppm, the soils will be transferred off site to an approved disposal facility. This work was filed under ADEC Project #2334.38.013. |
Peter Campbell |
| 7/5/2017 |
Document, Report, or Work plan Review - other |
Receive work plan for PCB groundwater sampling at Plant 10 and SCU 14-3. Sampling at 14-3 had not been conducted for many years but was called for in the COBC. This pad was the site of the disposal pit and thermal treatment of PCB's. |
Peter Campbell |
| 2/9/2018 |
Document, Report, or Work plan Review - other |
Reviewed the 2017 Compressor Plant 10 PCB Groundwater Monitoring Report, dated February 7, 2018, prepared by AECOM Technical Services, Inc. During the 2017 PCB groundwater samplings conducted on June 7, 2017 and September 21, 2017, all monitoring wells tested did not detect PCB’s within the samples taken. The depth to groundwater was consistent with previous sampling events. The groundwater was flowing north northwest. Groundwater samples were also collected from three monitoring wells at SCU-14-3, where PCB impacted soils had been stored, thermally remediated and disposed. No PCB's were detected in the three groundwater samples collected at SCU 14-3. |
Peter Campbell |
| 7/11/2018 |
Document, Report, or Work plan Review - other |
Review and approve Produced Water Line & Electrical / Instrumentation Line Installation
Soil Management Work Plan. Work near the compressor plant will involve testing soils for PCB contamination. Workplan and approval letter filed under 2334.38.013, Swanson River Compressor Plant.
|
Peter Campbell |
| 8/23/2018 |
Update or Other Action |
Change sampling schedule for PCB groundwater monitoring at SCU 14-3 to every 5 years from 2018 onward. |
Peter Campbell |
| 10/22/2019 |
Document, Report, or Work plan Review - other |
Review 2018 Compressor Plant 10 and Soldotna Creek Unit 14-3 PCB Groundwater Monitoring Report. PCB's were not detected in the groundwater sampling results at either site. Interesting to note that on PCB detection in monitoring well CP-A on October 12, 2006 occurred when groundwater was historically high at a groundwater depth of 4.88 feet below ground surface. |
Peter Campbell |
| 4/6/2020 |
Document, Report, or Work plan Review - other |
Review 2018 and 2019 Compressor Plant 10 PCB Groundwater Monitoring Report. PCB's were not detected in the groundwater sampling results. The consultant has asked the USFWS, as the lead agency on the compliance order by consent, to change the sampling schedule from semi-annual to annual. |
Peter Campbell |
| 5/19/2020 |
Document, Report, or Work plan Review - other |
Review and approve the 2020 work plan for groundwater sampling. |
Peter Campbell |
| 7/28/2020 |
Document, Report, or Work plan Review - other |
Reviewed the Soil Management Plan Boiler Building feedwater Piping Replacement Excavation Work Plan. Segregating clean soil from dirty soil in a trench excavation based on discrete sampling, with no way to screen soils for PCB's in the field is not practical. With this quantity of soil excavated, if PCB’s are detected in significant concentrations, Hilcorp should consider the entire mass suspect and either conduct additional sampling of the excavated “clean soils” or dispose of the entire excavated mass.
In addition, use Modified level D PPE with boots that can be deconned, or use disposable boot coverings. The work plan is approved with these conditions.
|
Peter Campbell |
| 7/28/2020 |
Workplan Requested |
Request to Hilcorp for a work plan to test workers exposures to PCB's in the area of the compressor building. |
Peter Campbell |
| 6/2/2021 |
Update or Other Action |
A May 30, 2021 pipeline release discharged crude oil onto the ground surface in an area of historical PCB impacts. The ADEC spill responders have been informed. |
Peter Campbell |
| 10/28/2021 |
Update or Other Action |
The EPA reviewed the September 2021 Trenching and Flowline Project work plan and has assumed primary regulatory authority under TSCA for all PCB related work in the Swanson River Oil Field. |
Peter Campbell |
| 10/27/2022 |
Long Term Monitoring Workplan or Report Review |
Review groundwater monitoring report for 2022. No PCB's detected in groundwater. |
Peter Campbell |
| 10/3/2023 |
Meeting or Teleconference Held |
Call with Hilcorp and their consultant and Mike Evans of Spill Response. Hilcorp is conducting a pipeline placement excavation through a potentially PCB impacted area under the EPA's CERCLA regulations. The test excavations are up to six feet deep. Weathered hydrocarbons were encountered in one of the trenches at approximately two feet below ground level. Hilcorp was asked to document the location, characterize the impacted soils with the full suite of hydrocarbons and volatiles. See "Pipeline Route Field Sampling Requirement at Compressor Plant" in attachments. |
Peter Campbell |
| 3/13/2024 |
Document, Report, or Work plan Review - other |
Reviewed the Soil Management Plan for PCB’s (November 2023) and commented to the EPA. The plan is reasonable, but I did spot one what I believe to be factual error on page 8. “The explosion at the Facility that released heat transfer fluids containing PCBs occurred prior to 1978. The concentration of the PCBs in the fluids is not documented but based on some of the pre-removal characterization soil sample results from the 1987-1990 cleanup, concentrations were likely > 500 mg/kg, which would classify the residual PCBs as PCB remediation waste (item 2 above). Based on the reports documenting the subsequent cleanup from 1987-1990 (E&E, 1989a, 1990, 1991), soil with PCBs > 50 mg/kg is no longer present.” The database map "Plant 10 Area PCB Map" - 1989 Area That May Require Additional Excavation shows elevated sample results in an area surrounding and under the foundation of Building “A” and “E” contain elevated concentrations of PCB’s (14,000 ppm). This is the primary area that is to be the focus of remediation at facility end of life. The figure (database attachment) depicts several areas that exceed 25 ppm PCB. |
Peter Campbell |
| 3/20/2024 |
Long Term Monitoring Workplan or Report Review |
Review 2023 Compressor Plant 10 and SCU 14-3 PCB Groundwater Monitoring Report. PCB's were not detected in the groundwater sampling results. |
Peter Campbell |
| 4/25/2024 |
Long Term Monitoring Workplan or Report Review |
Review the April 8, 2024 Notification of Construction Project Involving Soil Disturbance at Swanson River
Facility, Alaska, 2024 Anode Groundbed Installation. This notification was submitted to the EPA for review and approval. DEC had no comment on the plan. |
Peter Campbell |
| 4/26/2024 |
Site Characterization Report Approved |
Review Soil Sampling and Management Report 2023 Pipeline Integrity Digs. Soil samples were collected from four excavation areas around the Compressor Plant in September and October 2023 to characterize concentrations of PCBs in the soil prior to and during a pipeline integrity dig project. Sampling was performed following TSCA sampling methods. Approximately 835 CY of soil was sampled and removed from successive 2 ft soil cuts to facilitate the pipeline integrity digs. No samples had a PCB concentration greater than 10 mg/kg, so no soil required offsite disposal due to PCBs. Soil with PCB concentrations above 1 mg/kg was detected in two samples. The maximum detected concentration was 4.4 mg/kg in a sample from a depth of 1.8 ft bgs in Excavation 2, near the Therminol Heating Building. One sample from 0.4 ft bgs in Excavation 3 contained PCBs at 1.03 mg/kg. All soil was returned to the excavation and approximate depth where it had originated with the exception of 8 CY of petroleum contaminated soil. During soil removal in the southeast corner of Excavation 4, an area of petroleum contaminated soil was encountered at 2 to 4 ft bgs. No free product or petroleum-saturated soils were observed. The impacts were not present at the ground surface. The source was attributed to an unreported historical product spill. Soil was segregated based on odor and visual evidence. Below 6 ft, the soil did not appear to be impacted by petroleum. An estimated 6 CY was segregated from 2 to 4 ft bgs, and 2 CY from 4 to 6 ft. The excavation terminated at the water table, and there was no evidence of sheening on groundwater that percolated into the excavation. DRO sample results ranged from 7,760 mg/kg to 683 mg/kg. The lateral extent to the east extending beyond the excavation was not delineated. Offsite disposal of soil was limited to the 8 CY of petroleum contaminated soil removed from Excavation 4. All other excavated soil was returned to the excavation from which it originated or stockpiled onsite for later reuse. The following contaminants were detected above cleanup levels: DRO, GRO, 1,2,4 Trimethylbenzene, 1,3,5 Trimethylbenzene, Ethylbenzene, Naphthalene, 1-Methylnaphthalene, and 2-Methylnaphthalene.
|
Peter Campbell |
| 5/7/2024 |
Update or Other Action |
Notification to EPA of Construction Project Involving Soil Disturbance at Swanson River - 2024 Piling Installation for Aboveground Pipeline Supports. Call to Hilcorp environmental manager Marshall Farris to discuss the elevated potential to encounter PCB's at the footer of the cooling tower pads, as limited excavation took place in these areas. Typical pattern was to cover soils with liner, soil and grass seed. If liner is encountered in excavation work, elevated precautions are warranted. |
Peter Campbell |
