Site Report: Chevron - #6097

Site Name:	Chevron - #6097
Address:	303 W. Fireweed Ln., Anchorage, AK 99503
File Number:	2100.26.007
Hazard ID:	24073
Status:	Active
Staff:	Rebekah Reams, 9074512144 rebekah.reams@alaska.gov
Latitude:	61.198631
Longitude:	-149.887336
Horizontal Datum:	NAD83

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

In 1990 40 cubic yards of used oil contaminated soils were encountered during a used oil UST removal. Three gasoline USTs, one used oil UST, and one heating oil UST removed in 1992. Gasoline contamination was found and a vapor extraction system was installed later in 1992. Replacement tanks and piping were installed in 1992. All of the remaining tanks, piping, and hydraulic lifts were removed when service station building was removed in 2000. As of June 2003 the SVE system has removed 9,970 pounds of GRO and 1,714 pounds of BTEX. Up to 6 inches of product has been identified on groundwater within the property in 2003. On July 23, 2007 two buried tanker truck tanks were encountered in the southern portion of the property near the intersection of Fireweed and C Street during the excavation of the building footers. Confirmation soil samples were collected from the buried tanker excavation had up to 3.27 mg/kg benzene and 665 mg/kg GRO.

Action Information

Action Date	Action	Description	DEC Staff
8/17/1990	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 78072 ADD;	Former Staff
8/17/1990	Site Added to Database		Former Staff
8/18/1990	Leaking Underground Storage Tank Cleanup Initiated - Petroleum	LCAU Date changed DB conversion	Former Staff
9/20/1990	Release Investigation	Hart Crowser final report concerning UST cleanup operations. No halogenated organics were detected in Sample SP-1 taken from excavated soils stockpile on 10/5/90.	Former Staff
9/20/1990	Underground Storage Tank Site Characterization or Assessment	Used oil UST removal and associated contaminated soils. Chevron determined the UST was sound, therefore, it was reinstalled at this site. The UST was reinstalled and the excavation was backfilled on 10/5/90. Approximately 40 cubic yards of soils was excavated stockpiled on-site.	Former Staff
10/16/1990	Update or Other Action	Notice of release/request for corrective action sent to Chevron, U.S.A. Confirms release was reported and ADEC requires an impartial third party to perform a site assessment and cleanup of soil and groundwater contamination. Received a final UST cleanup report on 11/29/90.	Former Staff
11/26/1990	Document, Report, or Work plan Review - other	The contaminated stockpiled soils had 1,570 mg/kg TPH and therefore could not be processed at the Regional Landfill. These soils were scheduled to be processed on 11/26/90 by Alaska Pollution Control.	Former Staff
12/26/1990	Update or Other Action	ADEC 12/26/90 letter to Chevron USA requesting additional information concerning: tightness test results for reinstalled waste oil UST, and clarification of how the used oil system failed.	Former Staff
11/19/1992	Update or Other Action	RP removed 5 tanks (3 gasoline, 1 used oil, and 1 heating oil). 2,556 tons of contaminated soils were thermally treated at ASR. Contamination remains. RP installed vapor extraction lines to help remediate remaining contamination.	Former Staff
1/22/1993	Document, Report, or Work plan Review - other	Water well survey reveals several drinking water wells within 1/4 mile. Requested, at a minimum, that the two nearest down gradient wells be sampled.	Former Staff
3/28/1995	Document, Report, or Work plan Review - other	Reviewed and approved corrective action plan.	Former Staff
11/16/1995	Document, Report, or Work plan Review - other	Reviewed a release investigation.	Former Staff
12/21/1995	Document, Report, or Work plan Review - other	Reviewed and approved a corrective action plan.	Former Staff
11/20/1997	Update or Other Action	ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: CHEVRON PRODUCTS COMPANY, INC/PERMITS DESK	Former Staff
6/24/1999	Update or Other Action	Soil vapor extraction system begins operation.	Robert Weimer
1/30/2001	Meeting or Teleconference Held	Annual meeting with ADEC & Chevron to review Alaska sites and set goals for 2001. See meeting notes for additional details.	Linda Nuechterlein
5/8/2003	Document, Report, or Work plan Review - other	ADEC approves workplan for the installations of geoprobe borings to help delineate product plume.	Robert Weimer
5/22/2003	Document, Report, or Work plan Review - other	Semi-annual groundwater monitoring found gasoline product in MW-5, 3.2 mg/l benzene in MW-7, and 0.11 mg/l in off property monitoring well MW-8.	Robert Weimer
6/19/2003	Offsite Soil or Groundwater Disposal Approved	Approved soils to ASR for thermal treatment	Robert Weimer
9/11/2003	Document, Report, or Work plan Review - other	ADEC approves workplan to install 3 additional on property monitoring wells and 1 off property monitoring well to help define the extent of dissolved gasoline contamination in the groundwater, and the extent of the gasoline product on the groundwater. Consultant is also to conduct a drinking water well search in the area.	Robert Weimer
8/10/2004	Document, Report, or Work plan Review - other	June 10, 2004 groundwater sampling. Up to 3.4 mg/l DRO, 70.0 mg/l GRO, and 2,000 ug/l benzene in groundwater. Contamination levels appear to be generally stable.	Robert Weimer
8/23/2004	Document, Report, or Work plan Review - other	Second quarter 2004 remediation system status report. Soil vapor extraction system operated 57% of the time, it removed 3.7 pounds of GRO during this quarter.	Robert Weimer
11/23/2004	Document, Report, or Work plan Review - other	September 22, 2004 groundwater sampling. Up to 7.2 mg/l DRO, 68 mg/l GRO, and 2,400 ug/l benzene in groundwater. Contamination levels appear to be generally decreasing.	Robert Weimer
12/10/2004	Document, Report, or Work plan Review - other	Third quarter 2004 remediation system status report. Soil vapor extraction system operated 93% of the time, it removed 69.5 pounds of GRO during this quarter. To date, the remediation system has removed 10,034 pounds of GRO and 1705 pounds of BTEX.	Robert Weimer
2/7/2005	Document, Report, or Work plan Review - other	Fourth quarter 2004 remediation system status report. Soil vapor extraction system operated 100% of the time, it removed 38.9 pounds of GRO and 5.8 pounds of BTEX during this quarter. To date, the remediation system has removed 10,073 pounds of GRO and 1,710 pounds of BTEX.	Robert Weimer
3/17/2005	Document, Report, or Work plan Review - other	ADEC letter approving workplan to install 3 monitoring wells on the adjacent property. ADEC letter requests additional monitoring wells down gradient of MW-12 to help define the extent of the groundwater plume. The last monitoring event of 9/22/04 found 2.3 mg/l DRO and 160 ug/l benzene in MW-12. Discussed this with RP's consultant.	Robert Weimer
4/11/2005	Update or Other Action	ADEC approves request for extension to July/August 2005 to install furthest down gradient monitoring wells.	Robert Weimer
5/23/2005	Offsite Soil or Groundwater Disposal Approved	Reviewed and approved workplan for thermal treatment of 17 drums of soil generated during recent installation of additional monitoring wells.	Robert Weimer
6/13/2005	Document, Report, or Work plan Review - other	First quarter 2005 remediation system status report. Soil vapor extraction system operated 71% of the time, it removed 6.1 pounds of BTEX during this quarter. To date, the remediation system has removed 10,073 pounds of GRO and 1,717 pounds of BTEX.	Robert Weimer
6/21/2005	Document, Report, or Work plan Review - other	Reviewed plan to relocated treatment shed to the northwest corner of the property.	Robert Weimer
7/28/2005	Document, Report, or Work plan Review - other	May 18, 2005 groundwater sampling. Up to 2.6 mg/l DRO, 65 mg/l GRO, and 960 ug/l benzene in groundwater. Contamination levels appear to be generally decreasing. Groundwater flow direction is to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined.	Robert Weimer
8/4/2005	Meeting or Teleconference Held	Meeting with Chevron to discuss future site work. They are to sample the two highest contaminated wells for EDB and 1,2-DCA. The operating remediation is to be upgraded in 2006/2007. They will submit a workplan for the installation of an additional monitoring well to define the extent of the groundwater contamination. They confirmed that the remediation shed has been moved and the remediation system is operating again.	Robert Weimer
8/10/2005	Document, Report, or Work plan Review - other	Received updated site map on the new location of the remediation shed. It has been moved to the northwest corner of the property. The system has been restarted.	Robert Weimer
8/12/2005	Document, Report, or Work plan Review - other	Second quarter 2005 remediation system status report. Soil vapor extraction system operated 94% of the time, it removed 5.5 pounds of GRO and 10.3 pounds of BTEX during this quarter. To date, the remediation system has removed 10,082 pounds of GRO and 1,725 pounds of BTEX. Recovery rates have increased since the previous quarter.	Robert Weimer
8/25/2005	Document, Report, or Work plan Review - other	2005 Off-Property Well Installation Report. In May 2005 three monitoring wells were installed on the down gradient property just west of the Chevron property. Soil and groundwater samples were collected. Up to 2,800 mg/kg DRO, 110 mg/kg GRO, and 0.04 mg/kg benzene was found in the soil. Up to 19.0 mg/l DRO, 0.22 mg/l GRO, and 44 ug/l benzene was found in the groundwater.	Robert Weimer
9/21/2005	Meeting or Teleconference Held	Discussed additional monitoring wells with RPs consultant. They are having trouble getting access and with utilities in the areas. They will work on it and keep the ADEC posted.	Robert Weimer
11/28/2005	Document, Report, or Work plan Review - other	Third quarter 2005 remediation system status report. Soil vapor extraction system operated 95% of the time, it removed 15 pounds of GRO and 5.5 pounds of BTEX during this quarter. To date, the remediation system has removed 10,097 pounds of GRO and 1,731 pounds of BTEX. Recovery rates have increased slightly since the previous quarter.	Robert Weimer
12/2/2005	Update or Other Action	ADEC received notification that the additional off property well is to be installed in early 2006 once property access is granted.	Robert Weimer
12/16/2005	Document, Report, or Work plan Review - other	September 28, 2005 groundwater sampling. Up to 1,400 mg/l DRO, 65 mg/l GRO, and 790 ug/l benzene in groundwater. Contamination levels appear to be generally decreasing. Groundwater flow direction is to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44 to 59 feet below ground surface.	Robert Weimer
1/30/2006	Document, Report, or Work plan Review - other	Fourth quarter 2005 remediation system status report. Soil vapor extraction system operated 82% of the time, it removed 3.9 pounds of GRO and 5.8 pounds of BTEX during this quarter. To date, the remediation system has removed 10,101 pounds of GRO and 1,737 pounds of BTEX. Recovery rates are about the same as the previous quarter.	Robert Weimer
2/9/2006	Meeting or Teleconference Held	Meeting with Chevron to discuss future site work. They are to sample the two highest contaminated wells for EDB and 1,2-DCA in 2006. They are having access problems with placing additional monitoring wells off property. Remediation system upgrade scheduled for 2007.	Robert Weimer
3/22/2006	Update or Other Action	Chevron provided information documenting difficulty in getting access to place down gradient wells that have been requested to help define the extent of the groundwater contamination.	Robert Weimer
8/16/2006	Document, Report, or Work plan Review - other	May 17, 2006 groundwater sampling. Up to 720 mg/l DRO, 64 mg/l GRO, and 640 ug/l benzene in groundwater. Contamination levels appear to be generally decreasing. Groundwater flow direction is to the west by northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 45 to 60 feet below ground surface.	Robert Weimer
8/22/2006	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of purge water.	Robert Weimer
9/8/2006	Update or Other Action	ADEC approves reduction in groundwater monitoring. Monitoring wells MW-6, MW-10, MW-13, and MW-15 are to be annual. MW-2 is to be sampled in place of paved over MW-11. Also suspend MTBE sampling in all wells.	Robert Weimer
10/16/2006	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of one drum of purge water.	Robert Weimer
11/8/2006	Document, Report, or Work plan Review - other	Second quarter 2006 Remediation System Status Report. Soil Vapor Extraction system is currently off (since March 2006) and is scheduled to restart in August 2006. A work plan to upgrade the system is to be submitted in the future.	Robert Weimer
11/8/2006	Document, Report, or Work plan Review - other	First quarter 2006 Remediation System Status Report. System operated 99% of this quarter. Soil Vapor Extraction system was turned off on March 2006 due to electrical problems and is scheduled to restart in August 2006. A work plan to upgrade the system is to be submitted in the future.	Robert Weimer
4/2/2007	Meeting or Teleconference Held	Meeting with RP to discuss site. They are to continue with quarterly groundwater monitoring and sampling. RP plans to replace some wells, do more release investigation, and enhance the system in 2008.	Robert Weimer
4/3/2007	Document, Report, or Work plan Review - other	September 23, 2006 groundwater sampling. Up to 130 mg/l DRO, 45 mg/l GRO, and 270 ug/l benzene in groundwater. Contamination levels appear to be generally decreasing. Groundwater flow direction is to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 41.3 to 57.6 feet below ground surface.	Robert Weimer
4/11/2007	Document, Report, or Work plan Review - other	Third quarter 2006 Remediation System Status Report. Soil Vapor Extraction system is currently off (since March 2006) and is scheduled to restart in October 2006. A work plan to upgrade the system is to be submitted in the future.	Robert Weimer
5/3/2007	Update or Other Action	ADEC approves abandoning monitoring wells MW-1, MW-2, MW-3, and MW-11 which are in the area of the proposed new building on the property. Replacement monitoring wells will be evaluated later. ADEC requests that the RP have a qualified person on site during excavation activities to assess excavated soil for contamination and be any contaminated soil encountered be properly stored/treated/disposed of in an approved manner. ADEC also requests a submittal by July 1, 2007 of an evaluation of the indoor air pathway into the proposed structure and the existing building to the west of the property. Engineering controls and/or active vapor recovery may be necessary.	Robert Weimer
5/21/2007	Document, Report, or Work plan Review - other	Fourth quarter 2006 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system broke down on November 23, 2006, and is currently down for repairs. During the December 2006 site visit, the SVE line were found to be frozen. A work plan to upgrade the system is to be submitted in the future.	Robert Weimer
6/1/2007	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of two drums of purge water.	Robert Weimer
6/18/2007	Update or Other Action	ADEC approves installation of a multi-level soil vapor probe to help assess soil vapor levels at the site.	Robert Weimer
7/2/2007	Document, Report, or Work plan Review - other	ADEC approves sampling plan for the soils to be excavated during the building work this summer.	Robert Weimer
7/11/2007	Offsite Soil or Groundwater Disposal Approved	ADEC approves thermal treatment 4 drums of contaminated soil at ASR. The soil was generated during the installation of the vapor probe well.	Robert Weimer
7/13/2007	Offsite Soil or Groundwater Disposal Approved	ADEC approves thermal treatment of one stockpile and off property disposal of another stockpile.	Robert Weimer
7/16/2007	Update or Other Action	ADEC approves the storage of potentially contaminated soil at ASR while awaiting sampling.	Robert Weimer
7/20/2007	Offsite Soil or Groundwater Disposal Approved	ADEC approves thermal treatment of one stockpile (150 cubic yards) and off property disposal of another stockpile (300 cubic yards).	Robert Weimer
7/23/2007	Site Visit	Site visit to observe excavation activities and the removal of the recently discovered two underground storage tanks (USTs). The USTs are two buried fuel tanker trailers. Some soil is also in the tanks from two missing access ports. On July 23, 2007 two buried tanker truck tanks were encountered in the southern portion of the property near the intersection of Fireweed and C Street during the excavation of the building footers. 1,740 gallons of contaminated water and 174 gallons of fuel and some contaminated soil were removed from the buried tankers. Confirmation soil samples were collected from the buried tanker excavation had up to 3.27 mg/kg benzene, 665 mg/kg GRO, non-detect (<20 mg/kg) DRO, non-detect (<0.126 mg/kg) PCBs, 5.62 mg/kg Arsenic, 33.9 mg/kg Chromium, 31.6 mg/kg lead, non detect for solvents and PAHs, and non-detect (<50 mg/kg) RRO.	Robert Weimer
7/31/2007	Document, Report, or Work plan Review - other	First quarter 2007 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system broke down on November 23, 2006, and is currently down for repairs. During the December 2006 site visit, the SVE line were found to be frozen. A work plan to upgrade the system is to be submitted in the future.	Robert Weimer
8/21/2007	Offsite Soil or Groundwater Disposal Approved	Approved thermal treatment of 30.21 tons of contaminated soil that was removed from the inside of the two recently discovered tanks.	Robert Weimer
8/23/2007	Update or Other Action	ADEC requests that during construction groundwater monitoring continue at the site in all accessible wells.	Robert Weimer
10/16/2007	Document, Report, or Work plan Review - other	Second quarter 2007 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system broke down on November 23, 2006, and is currently down for repairs. During the December 2006 site visit, the SVE line were found to be frozen. A work plan to upgrade the system is to be submitted in the future. During site construction one of the remedial wells (MW-2) was damaged. Electrical panel is also being relocated.	Robert Weimer
10/17/2007	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of one drum of contaminated purge water.	Robert Weimer
2/4/2008	Document, Report, or Work plan Review - other	September 27, 2007 groundwater sampling. Up to 1.4 mg/l DRO, 0.4 mg/l GRO, and 100 ug/l benzene in groundwater. Only the 5 off-property monitoring wells were sampled during this sampling event. Contamination levels appear to be generally decreasing. Groundwater flow direction is to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 41.41 to 58.09 feet below ground surface.	Robert Weimer
3/3/2008	Document, Report, or Work plan Review - other	Third quarter 2007 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system broke down on November 23, 2006, and is currently down for repairs. During the December 2006 site visit, the SVE line were found to be frozen. A work plan to upgrade the system is to be submitted in the future. During site construction one of the remedial wells (MW-2) was damaged. Electrical panel is also being relocated. Chevron will attempt to restart the system during the fourth quarter of 2007.	Robert Weimer
3/5/2008	Meeting or Teleconference Held	Meeting with Chevron and their consultants. Chevron to conduct and indoor air evaluation for this site. They will evaluate active remediation at this site. They will also propose replacement monitoring wells. They plan additional assessment of the downgradient property.	Robert Weimer
5/1/2008	Document, Report, or Work plan Review - other	Approve workplan for additional soil and groundwater delineation. The workplan proposes to drill and sample 4 soil boring and to complete on as a monitoring well on the adjacent property. The other 3 soil borings will have groundwater samples collected from them and they may be completed as a monitoring well if they are found to be contaminated. Additional soil sampling and monitoring wells, beyond what is proposed in this workplan, will be required in the future to define the extent of the contamination.	Robert Weimer
5/1/2008	Document, Report, or Work plan Review - other	Fourth quarter 2007 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system broke down on November 23, 2006, and is currently down for repairs. During the December 2006 site visit, the SVE line were found to be frozen. A work plan to upgrade the system is to be submitted in the future. During site construction one of the remedial wells (MW-2) was damaged. Electrical panel is also being relocated. Chevron will restart the system during the first quarter of 2008.	Robert Weimer
5/21/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves the direct haul to Emerald Alaska for treatment of contaminated water generated during the installation of off property monitoring wells.	Robert Weimer
6/10/2008	Exposure Tracking Model Ranking	Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site.	Robert Weimer
6/10/2008	Exposure Tracking Model Ranking	Intitial Ranking Complete for Source Area: 78072 (Autogenerated Action)
6/24/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves thermal treatment of 5 super sacks of contaminated soil drill cutting.	Robert Weimer
7/30/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of drums of contaminated purge water.	Robert Weimer
9/2/2008	Document, Report, or Work plan Review - other	Approve workplan for additional soil and groundwater delineation. The workplan proposes to drill and sample 2 soil borings on the adjacent property and to complete them as monitoring wells if contamination is found at that location. Additional soil sampling and monitoring wells, beyond what is proposed in this workplan, will be required in the future to define the extent of the contamination.	Robert Weimer
9/11/2008	Site Visit	At the request of the project manager, the quality assurance officer was onsite during soil boring and monitoring well installation activiites to oversee compliance with ADEC approved work plans. Not deviaitons were noted to the approved work plan.	Brenton Porter
9/24/2008	Offsite Soil or Groundwater Disposal Approved	Approved thermal treatment of 3 supersacks of contaminated drill cuttings.	Robert Weimer
9/30/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of drums of contaminated purge water.	Robert Weimer
11/25/2008	Document, Report, or Work plan Review - other	First quarter 2008 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system was repaired and began operation in early 2008, but then was shut down again due to electrical issues. Chevron plans to restart the system in June 2008. A work plan to upgrade the system is to be submitted in the future.	Robert Weimer
11/26/2008	Document, Report, or Work plan Review - other	May 17, 2008 groundwater sampling. Up to 6.6 mg/l DRO, 0.1 mg/l GRO, and 20 ug/l benzene in groundwater. Only the 2 off-property monitoring wells were sampled during this sampling event. Contamination levels increased in 1 of the 2 monitoring wells sampled. Groundwater flow direction is to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 43.86 to 56.4 feet below ground surface.	Robert Weimer
12/5/2008	Document, Report, or Work plan Review - other	Review of Soil Excavation and Vapor Barrier Installation Report. The report documented The abandonment of monitoring wells MW-1, MW-2, MW-3, MW-10, and MW-11 in May/July 2007. A multi-level soil vapor well was installed on June 22, 2007. Vapor samples were collected at 5 and 40 feet below ground surface had benzene up to 4.1 ppbv which exceeded the EPA screening level of 0.98 ppbv. During the construction of the hotel Chevron's consultant was onsite to field screen and sample excavated soil for reuse and/or off property treatment/disposal. 730 tons of contaminated soil was thermally treated. On July 26, 2007 two buried tanker truck tanks were encountered in the southern portion of the property during the excavation of the building footers. 1,740 gallons of contaminated water and 174 gallons of fuel and some contaminated soil were removed from the buried tankers. Confirmation soil samples were collected from the buried tanker excavation had up to 3.27 mg/kg benzene, 665 mg/kg GRO, non-detect (<20 mg/kg) DRO, non-detect (<0.126 mg/kg) PCBs, 5.62 mg/kg Arsenic, 33.9 mg/kg Chromium, 31.6 mg/kg lead, non detect for solvents and PAHs, and non-detect (<50 mg/kg) RRO. On September 5, 2007 a vapor barrier was installed over the building footers, base of the building, and foundation, but no active ventilation was installed under the building.	Robert Weimer
2/25/2009	Meeting or Teleconference Held	Meeting with Chevron and their consultants. Chevron to conduct and indoor air evaluation for this site. Chevron is to add monitoring well MW4 to BTEX/GRO sampling. Chevron is to provide a release investigation plan and a corrective action plan and to look at sample location data for the southern tanks location. Chevron to collect MNA data and look for any rebound in groundwater contamination. Chevron may need to restart the remediation system and hook up monitoring well MW7 location to the system.	Robert Weimer
4/3/2009	Document, Report, or Work plan Review - other	September 14, 2008 groundwater sampling. Up to 55 mg/l DRO, 34 mg/l GRO, and 100 ug/l benzene in groundwater. Four on-property monitoring well and six off-property monitoring wells were sampled during this sampling event. Contamination levels increased in 4 of the 10 monitoring wells sampled. Groundwater flow direction is to the west by northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 41.36 to 60.02 feet below ground surface.	Robert Weimer
4/3/2009	Document, Report, or Work plan Review - other	In June and September 2008, five additional soil borings were installed at off property locations to the north and west of the Chevron property. Up to 1900 mg/kg DRO, 120 mg/kg GRO, and <0.05 mg/kg benzene in the soil samples. Higher soil contamination may exist since the highest field screening depths were not sampled in some of the soil borings (SB-2, SB-3, and MW-17). Two of the soil borings were completed as monitoring wells. Up to 1000 mg/l DRO, 1.3 mg/l GRO, and 40 ug/l benzene in the 5 groundwater samples collected from the borings/new monitoring wells. Some water samples are biased low due to not being preserved in the field.	Robert Weimer
6/15/2009	Update or Other Action	ADEC letter requesting a release investigation workplan by August 1, 2009 to define the extent of the soil and possible groundwater contamination at the southern tank location. The letter also requests by August 1, 2009 a replacement monitoring well for MW-4 that was found to have been destroyed.	Robert Weimer
6/30/2009	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of drums of contaminated purge water.	Robert Weimer
7/22/2009	Document, Report, or Work plan Review - other	Fourth quarter 2008 Remediation System Status Report. Soil Vapor Extraction system was restarted after June 2008. During this quarter the system operated 99% of the time. The current system only extracts from one location MW-5. Recovery from this limited area was non-detect. A work plan to upgrade the system is to be submitted in the future.	Robert Weimer
7/24/2009	Document, Report, or Work plan Review - other	First quarter 2009 Remediation System Status Report. Soil Vapor Extraction system was restarted after June 2008. During this quarter the system operated 100% of the time. The current system only extracts from one location MW-5. Recovery from this limited area was non-detect. A work plan to upgrade the system is to be submitted in the future.	Robert Weimer
10/1/2009	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of drums of contaminated purge water.	Robert Weimer
11/25/2009	Document, Report, or Work plan Review - other	May 29, 2009 groundwater sampling. Up to 68 mg/l DRO, 26 mg/l GRO, and 130 ug/l benzene in groundwater. Four on-property monitoring well and six off-property monitoring wells were sampled during this sampling event. Contamination levels increased in 2 of the 10 monitoring wells sampled. Groundwater flow direction was to the west by northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.22 to 59.79 feet below ground surface.	Robert Weimer
2/19/2010	Document, Report, or Work plan Review - other	May 29, 2009 groundwater sampling. Up to 100 mg/l DRO, 23 mg/l GRO, and 120 ug/l benzene in groundwater. Four on-property monitoring well and six off-property monitoring wells were sampled during this sampling event. Contamination levels increased in 5 of the 10 monitoring wells sampled. Groundwater flow direction was to the west by northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.66 to 60.15 feet below ground surface.	Robert Weimer
3/11/2010	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 3/10/10. MW5 & MW7 are to be sampled for PAH the next monitoring event. Chevron to provide a revised workplan for release investigation at the two tank area. Chevron to evaluate ehnanced monitored natural attenuation or active remediation at the site. We discussed that groundwater samples for volatiles should not be collected with bailers or peristaltic pumps due to the loss of volatiles, Chevron is to provide a workplan specifying how groundwater samples will be collected in the future.	Robert Weimer
2/23/2011	Document, Report, or Work plan Review - other	DEC conditionally approves the work plan to install two replacement monitoring wells, and to collect soil, water, and natural attenuation samples. The modification is that for replacement monitoring well MW-4 that soil samples only need to be collected at the soil/water interface and the highest field reading depths.	Robert Weimer
3/30/2011	Document, Report, or Work plan Review - other	May 11, 2010 groundwater sampling. Up to 11 mg/l DRO, 23 mg/l GRO, and 92 ug/l benzene in groundwater. PAH's above groundwater cleanup levels in monitoring well MW-5. Four on-property monitoring well and five off-property monitoring wells were sampled during this sampling event. Contamination levels increased in 6 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.55 to 60.00 feet below ground surface.	Robert Weimer
4/20/2011	Update or Other Action	ADEC approves request to suspend until further notice the analytical sampling of monitoring well MW-6, MW-15, and MW-17, and reduce analytical sampling of MW-16 to DRO.	Robert Weimer
6/6/2011	Meeting or Teleconference Held	Talked with property owner about the approved plan to install two additional monitoring wells on the property. MW-10R is to replace MW-10 and to assess downgradient of the monitoring wells that were under the hotel building foot print. MW-4R is not to replace MW-4, it is to investigate contamination from the two tanks found to the south of the hotel.	Robert Weimer
8/30/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approved the thermal treatment of 9 drums of contaminated drill cuttings from the August 2011 subsurface investigation.	Robert Weimer
8/30/2011	Document, Report, or Work plan Review - other	September 7, 2010 groundwater sampling. Up to 18 mg/l DRO, 19 mg/l GRO, and 89 ug/l benzene in groundwater. PAH's above groundwater cleanup levels in monitoring well MW-5. Contamination levels increased in 7 of the 10 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.49 to 60.40 feet below ground surface.	Robert Weimer
11/1/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of drums of contaminated purge water.	Robert Weimer
11/28/2011	Document, Report, or Work plan Review - other	April 20, 2011 groundwater sampling. Up to 11 mg/l DRO, 20 mg/l GRO, and 87 ug/l benzene in groundwater. PAH's above groundwater cleanup levels in monitoring well MW-5. Contamination levels increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 45.36 to 60.24 feet below ground surface.	Robert Weimer
2/29/2012	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/28/12. Semi-annual groundwater monitoring is to continue and well monuments are to be repaired. They will add RRO analysis in monitoring wells 5, 7, 8, 9, 10R, 12, 13, 14, and 16 for the next monitoring event. They are to add a rose diagram to the monitoring figure. They are to submit a corrective action plan for the remaining soil and groundwater contamination at the site.	Robert Weimer
10/23/2012	Document, Report, or Work plan Review - other	September 28, 2011 groundwater sampling. Up to 330 mg/l DRO, 16 mg/l GRO, and 75 ug/l benzene in groundwater. Contamination levels increased in 7 of the 8 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 40.76 to 58.52 feet below ground surface.	Robert Weimer
10/29/2012	Document, Report, or Work plan Review - other	In June 2011 two additional monitoring wells were installed on the property. MW-10R is to replace MW-10 and to assess downgradient of the monitoring wells that were under the hotel building foot print. MW-4R is not to replace MW-4, it is to investigate contamination from the two tanks found to the south of the hotel. MW-10R had up to 190 mg/kg GRO, 45 mg/kg DRO, and 0.84 mg/kg benzene in the soil samples collected. MW-4R was non-detect for GRO, DRO, and benzene in the soil samples collected.	Robert Weimer
10/29/2012	Conceptual Site Model Submitted	Conceptual Site Model identified soil, groundwater, and air exposure routes.	Robert Weimer
2/26/2013	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/26/13. Chevron proposes to continue semi-annual groundwater monitoring, is approved to remove the unused SVE shed, provide missing reports, and provide a corrective action plan for the remaining soil and groundwater contamination at the site. They are to add a rose diagram to the monitoring figure. The next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data.	Robert Weimer
3/12/2013	Site Visit	Site visit to observe current site conditions.	Robert Weimer
4/12/2013	Document, Report, or Work plan Review - other	May 21, 2012 groundwater sampling. Up to 39 mg/l DRO, 17 mg/l GRO, and 61 ug/l benzene in groundwater. Contamination levels increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 41.28 to 59.00 feet below ground surface.	Robert Weimer
5/17/2013	Update or Other Action	Consultant called that some of the groundwater samples recently collected were over temperature. They will flag the results as potentially biased low, but still can probably use the data for comparison basis of the purge/no-purge results.	Robert Weimer
11/14/2013	Document, Report, or Work plan Review - other	September 18, 2012 groundwater sampling. Up to 23 mg/l DRO, 15 mg/l GRO, 0.24 mg/l benzo(a)pyrene, and 68 ug/l benzene in groundwater. Contamination levels increased in 7 of the 11 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.24 to 60.12 feet below ground surface. Samples were collected using a bailer with out purging the wells prior to sampling. Because samples were collected using a bailer the volatile sample results are biased low.	Robert Weimer
2/11/2014	Document, Report, or Work plan Review - other	May 6, 2013 groundwater sampling. Up to 7.5 mg/l DRO, 21.2 mg/l GRO, and 58.8 ug/l benzene in groundwater. Contamination levels increased in 2 of the 9 monitoring wells sampled. Groundwater flow direction was to the west. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.24 to 59.90 feet below ground surface. Samples were collect by both no-purge (Hydrasleeve) and purge (bladder pump) methods. The sampling interval for the hydrasleeve was not documented in the field notes. The sample interval for the bladder pump was not documented in 4 of the wells sampled and the sample depth was not consistent where it was documented, in those it was between 3.15 and 10.21 feet below the groundwater surface. MW-16 had DRO at 7.5 mg/l with no-purge and 2.0 mg/l with purge. Because the sample depths were not consistent between the no-purge and purge methods we are not able to say that the two methods give consistent results for this site.	Robert Weimer
2/27/2014	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/27/2014. Because of problems with last year’s purge/no-purge sampling the next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data or they will switch to no purge for future sampling events. We discussed that the groundwater samples needs to be collected as close as possible to the soil/water interface, with the pump intake within a foot of the soil/water interface at the time of the sampling. After reviewing the results of the May 2014 groundwater sampling event the consultant may be requesting a reduction in ground water monitoring or DEC may request active treatment and/or additional monitoring wells to define the nature and extent of the contamination. In the future they will need to evaluate for a diving plume on the monitoring wells far from the release point. The consultant will make sure that their site reports are complete in accordance with DEC’s 9/23/2009 Site Characterization Work Plan and Reporting Guidance for Investigation of Contaminated Sites.	Robert Weimer
5/5/2014	Document, Report, or Work plan Review - other	September 16, 2013 groundwater sampling. Up to 7.0 mg/l DRO, 22.7 mg/l GRO, 0.336 mg/l naphthalene, and 54.9 ug/l benzene in groundwater. Contamination levels increased in 4 of the 10 monitoring wells sampled. Groundwater flow direction was to the west. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 43.91 to 59.96 feet below ground surface. Samples were collect by no-purge (Hydrasleeve) method. The sampling interval for the hydrasleeve was not documented in the field notes the results are considered biased low.	Robert Weimer
9/18/2014	Offsite Soil or Groundwater Disposal Approved	ADEC approves offsite treatment of one drum of contaminated purge water.	Robert Weimer
1/8/2015	Document, Report, or Work plan Review - other	May 2-5, 2014 groundwater sampling. Up to 3.5 mg/l DRO, 21.1 mg/l GRO, 0.241 mg/l naphthalene, and 42.5 ug/l benzene in groundwater. PAH results are biased low because they were analyzed outside of holding times. Contamination levels increased in 4 of the 10 monitoring wells sampled. Groundwater flow direction was to the west. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 43.50 to 59.56 feet below ground surface. Samples were collect by both no-purge (Hydrasleeve) and purge (bladder pump) methods. The sampling interval were within the top of the water column except for monitoring well MW5 that was not documented for the purge method. For this sampling event the no purge sample appears to give higher concentrations than the purge method (MW-7 had 21.1 mg/l GRO vs. 12.5 mg/l GRO).	Robert Weimer
5/13/2015	Document, Report, or Work plan Review - other	September 3, 2014 groundwater sampling. Up to 5.3 mg/l DRO, 10.0 mg/l GRO, 0.25 mg/l naphthalene, and 54.2 ug/l benzene in groundwater. PAH results are biased low because they were analyzed outside of holding times. Contamination levels increased in 5 of the 11 monitoring wells sampled. Groundwater flow direction was to the west. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 43.81 to 59.96 feet below ground surface. Samples were collect by no-purge (Hydrasleeve) method. The sampling interval was not within the top of the water column in monitoring wells (MW5, MW6, MW8, MW12, MW13, and MW14)as required. The results in those monitoring wells are considered biased low and can't be used for trends, characterization, and site closure evaluation.	Robert Weimer
10/2/2015	Document, Report, or Work plan Review - other	April 15, 2015 groundwater sampling. Up to 5.9 mg/l DRO, 20.0 mg/l GRO, 0.84 mg/l naphthalene, and 40.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for Benzo(b)fluoranthene, Benzo(a)pyrene, and Dibenz(a,h)anthracene and were the highest concentrations since May 2012. Contamination levels increased in 4 of the 7 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.23 to 60.24 feet below ground surface. Samples were collect by no-purge (Hydrasleeve) method.	Robert Weimer
1/25/2016	Update or Other Action	DEC approves extension request to submit the 2nd semi-annual 2015 groundwater monitoring report by February 29, 2016.	Robert Weimer
11/15/2016	Document, Report, or Work plan Review - other	October 29, 2015 groundwater sampling. Up to 5.1 mg/l DRO, 19.0 mg/l GRO, 0.84 mg/l naphthalene, and 13.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for Naphthalene. Contamination levels increased in 7 of the 12 monitoring wells sampled. Groundwater flow direction was to the west by northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.27 to 60.14 feet below ground surface. Samples were collect by no-purge (Hydrasleeve) method at the top of the water column.	Robert Weimer
3/2/2017	Document, Report, or Work plan Review - other	April 19, 2016 groundwater sampling. Up to 4.9 mg/l DRO, 20.0 mg/l GRO, 21 ug/l naphthalene, and 31.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for Benzo(a)anthracene, Benzo(a)pyrene, and Dibenzo(a,h)anthracene. Contamination levels increased in 8 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.68 to 60.01 feet below ground surface. Volatile samples were collect by no-purge (Hydrasleeve) method and other samples with a bailer at the top of the water column.	Robert Weimer
6/14/2017	Document, Report, or Work plan Review - other	September 23, 2016 groundwater sampling. Up to 5.8 mg/l DRO, 18.0 mg/l GRO, 8.9 ug/l naphthalene, and 35.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for Benzo(a)anthracene, Benzo(a)pyrene, Benzo(a)Fluoranthene, Indeno(1,2,3-cd)pyrene, and Dibenzo(a,h)anthracene. Contamination levels increased in 6 of the 10 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.79 to 60.36 feet below ground surface. Volatile samples were collect by no-purge (Hydrasleeve) method and other samples with a bailer at the top of the water column.	Robert Weimer
6/15/2017	Update or Other Action	DEC concurs with the 2016 reports recommendation to suspend, until further notice, the sampling of monitoring well MW-4R. DEC requests the submittal of a detailed work plan by August 1, 2017 for future groundwater sampling at this site. This is to include the sampling after purging the monitoring wells using a bladder pump or positive displacement pump with the well intake within the top foot of the water column at the time of the sampling. The sample analysis is to include the full VOCs (8260), GRO(AK101), and DRO(AK102) in all monitoring wells, and PAHs(8270) in select monitoring wells.	Robert Weimer
9/7/2017	Document, Report, or Work plan Review - other	ADEC conditionally approves GHD’s August 1, 2017 Groundwater Monitoring and Sampling Work Plan. The work plan proposes to collect groundwater samples from select site monitoring wells. The work plan is approved under the condition that PAH analysis includes monitoring well MW-16 in addition to the ones proposed in the work plan.	Robert Weimer
4/2/2018	Document, Report, or Work plan Review - other	May 8, 2017 groundwater sampling. Up to 16.0 mg/l DRO, 3.9 mg/l GRO, 1.4 ug/l naphthalene, and 34.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for 7 PAH compounds. Contamination levels increased in 9 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.11 to 59.99 feet below ground surface. Volatile samples were collect by no-purge (Hydrasleeve) method and other samples with a bailer at the top of the water column except for monitoring wells MW-5, MW-6, and MW-8 where the sample interval was not documented in the field notes.	Robert Weimer
4/20/2018	Document, Report, or Work plan Review - other	October 2, 2017 groundwater sampling. Up to 2.8 mg/l DRO, 12 mg/l GRO, 170 ug/l naphthalene, and 9.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for one PAH compound this monitoring event in the 4 monitoring wells sampled for PAHs. Contamination levels increased in 4 of the 10 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Depth to groundwater is 42.45 to 58.23 feet below ground surface. Volatile samples were collect at the top foot of the water column with a bladder pump after purging.	Robert Weimer
12/12/2018	Document, Report, or Work plan Review - other	May 24, 2018 groundwater sampling. Up to 3.3 mg/l DRO, 17 mg/l GRO, 200 ug/l naphthalene, and 7.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for one PAH compound this monitoring event in the 2 monitoring wells sampled for PAHs. Contamination levels increased in 4 of the 10 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Depth to groundwater is 42.16 to 57.81 feet below ground surface. Volatile samples were collect at the top foot of the water column with a bladder pump after purging.	Robert Weimer
1/17/2019	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 78072 1992 UST contamination.	Robert Weimer
6/13/2019	Document, Report, or Work plan Review - other	September 13, 2018 groundwater sampling. Up to 3.6 mg/l DRO, 13 mg/l GRO, 200 ug/l naphthalene, and 6.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for one PAH compound this monitoring event in the 2 of the 5 monitoring wells sampled for PAHs. Contamination levels increased in 6 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 42.29 to 57.89 feet below ground surface. Volatile samples were collect at the top foot of the water column with a bladder pump after purging.	Robert Weimer
9/23/2019	Update or Other Action	ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also VOC sampling needs to include the full 8260 VOC list including naphthalene.	Robert Weimer
9/24/2019	Document, Report, or Work plan Review - other	ADEC approves until further notice suspending all sampling of monitoring wells MW-6 and MW-13.	Robert Weimer
3/12/2020	Update or Other Action	ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also all BTEX and VOC sampling needs to include the full 8260 VOC list including naphthalene. ADEC is also requesting that all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions.	Robert Weimer
3/17/2020	Document, Report, or Work plan Review - other	DEC reviewed 2020 groundwater sampling plan and provided the following comments: For all future monitoring events please make sure that the field notes document the measurement of the pump intake that is within the top foot of the water column at the time of the sampling unless the top of the well screened interval is deeper, then in that case from the top foot of that screened interval. For all future monitoring events any monitoring well where BTEX or HVOC sampling is proposed it needs to be the full VOC (method 8260) list, including naphthalene. The field QC samples are per day of sampling at a site. For all future monitoring events all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. For all future monitoring events if a monitoring well is low yield and purges dry then a sample will still need to be collected that monitoring event once the monitoring well has recharged to approximately 80% of its pre-purge volume. If it has not returned to 80% of its pre-purged volume during that sampling day DEC requests that you return to the site early the next day to attempt to collect the water sample.	Robert Weimer
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
11/8/2021	Long Term Monitoring Workplan or Report Review	2021 Second Semi-Annual Groundwater Monitoring event was conducted on September 10, 2021. Groundwater samples were collected from monitoring wells MW-5, MW-7, MW-8, MW-9, MW-10R, MW-12, MW-14, and MW-16. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 49.78 to 67.29 feet below ground surface. DRO, GRO, ethylbenzene, total xylenes, naphthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 1-methylnaphthalene, and 2-methylnaphthalene exceeded cleanup levels during this sampling event with the highest contaminant concentrations observed at MW-7.	Rebekah Reams
6/8/2022	Long Term Monitoring Workplan or Report Review	2022 First Semi-Annual Groundwater Monitoring event was conducted on April 19, 2022. Groundwater samples were collected from monitoring wells MW-5, MW-7, MW-8, MW-9, MW-10R and MW-16. Monitoring wells MW-4R, MW-12, MW-13, MW-14, and MW-17 were frozen and unable to be gauged or sampled. MW-6 was inaccessible due to a large connex box placed over the well. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 50.06 to 67.83 feet below ground surface. DRO, GRO, ethylbenzene, total xylenes, naphthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 1-methylnaphthalene, and 2-methylnaphthalene exceeded cleanup levels during this sampling event with the highest contaminant concentrations observed at MW-7.	Rebekah Reams
9/29/2022	Document, Report, or Work plan Review - other	ADEC provided comments on the Treatment of Purge Water Utilizing Granular Activated Carbon (GAC) at Chevron Environmental Management Company Sites which includes standard operating procedures and breakthrough estimates proposed for use at this site.	Rebekah Reams
12/15/2022	Offsite Soil or Groundwater Disposal Approved	ADEC approved transport of one 55-gallon drum of waste generated during the fall 2022 groundwater monitoring event.	Rebekah Reams
12/29/2022	Long Term Monitoring Workplan or Report Review	2022 Second Semi-Annual Groundwater Monitoring event was conducted on August 22, 2022. Groundwater samples were collected from monitoring wells MW-5, MW-8, MW-9, MW-10R, MW-12, MW-14 and MW-16. Monitoring well MW-6 was inaccessible due to a large connex box placed over the well and monitoring wells MW-7 and MW-17 were inaccessible due to a cars parked over the well. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 50.29 to 67.82 feet below ground surface.	Rebekah Reams
3/29/2023	Long Term Monitoring Workplan or Report Review	ADEC approved the Groundwater Sampling Analyte Reduction Request. This work plan addendum proposes to update the groundwater monitoring schedule to include a revised analyte list for site wells, remove monitoring well MW-6 from the sampling plan, and add MW-15 to the sampling plan. Groundwater monitoring will continue to occur on a semi-annual basis.	Rebekah Reams
12/5/2023	Offsite Soil or Groundwater Disposal Approved	ADEC approved offsite transport of 36 gallons of purge water generated during groundwater monitoring at the site.	Rebekah Reams
6/21/2024	Long Term Monitoring Workplan or Report Review	2023 Second Semi-Annual Groundwater Monitoring event was conducted on August 21, 2023. Groundwater samples were collected from monitoring wells MW-5, MW-7, MW-8, MW-10R, MW-12 through MW-16. Monitoring wells MW-4R, MW-6, MW-9 and MW-17 were not sampled and MW-6 was not gauged due to being covered by a connex box. MW-9 was unable to be accessed due to car parked over. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the northwest and depth to groundwater was 43.32 to 59.57 feet below ground surface.	Rebekah Reams
8/14/2024	Long Term Monitoring Workplan or Report Review	2024 First Semi-Annual Groundwater Monitoring event was conducted on May 2, 2024. Groundwater samples were collected from monitoring wells MW-5, MW-6, MW-8, MW-9, MW-10R, MW-12, MW-13, MW-15 and MW-16. Monitoring wells MW-14 and MW-17 were frozen and could not be sampled, and MW-7 was not able to be accessed because a vehicle was parked over it. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 42.95 to 59.48 feet below ground surface.	Rebekah Reams
8/19/2024	Site Characterization Workplan Approved	ADEC approved the Soil and Groundwater Assessment Work Plan following comment resolution. This work plan proposes to advance 11 soil borings and install a monitoring well to further assess soil and groundwater impacts at the site.	Rebekah Reams
9/24/2024	Site Visit	ADEC conducted a site visit with Chevron and Arcadis personnel to observe site layout, sampling locations, and nearby features.	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
12/29/2024	Long Term Monitoring Workplan or Report Review	2023 First Semi-Annual Groundwater Monitoring event was conducted on April 19, 2023. Groundwater samples were collected from monitoring wells MW-5, MW-8, MW-9, MW-10R, MW-12, and MW-15. Monitoring wells MW-13, MW-14 and MW-16 were not sampled and MW-14 and MW-17 were not gauged due to frozen groundwater in the casing. MW-7 and MW-6 were unable to be accessed due to a parked car and connex located over the wells, respectively. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the north-northwest and depth to groundwater was 48.20 to 66.71 feet below ground surface.	Rebekah Reams

Action Date

Action

Description

DEC Staff

8/17/1990

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 78072 ADD;

Former Staff

8/17/1990

Site Added to Database

Former Staff

8/18/1990

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

LCAU Date changed DB conversion

Former Staff

9/20/1990

Release Investigation

Hart Crowser final report concerning UST cleanup operations. No halogenated organics were detected in Sample SP-1 taken from excavated soils stockpile on 10/5/90.

Former Staff

9/20/1990

Underground Storage Tank Site Characterization or Assessment

Used oil UST removal and associated contaminated soils. Chevron determined the UST was sound, therefore, it was reinstalled at this site. The UST was reinstalled and the excavation was backfilled on 10/5/90. Approximately 40 cubic yards of soils was excavated stockpiled on-site.

Former Staff

10/16/1990

Update or Other Action

Notice of release/request for corrective action sent to Chevron, U.S.A. Confirms release was reported and ADEC requires an impartial third party to perform a site assessment and cleanup of soil and groundwater contamination. Received a final UST cleanup report on 11/29/90.

Former Staff

11/26/1990

Document, Report, or Work plan Review - other

The contaminated stockpiled soils had 1,570 mg/kg TPH and therefore could not be processed at the Regional Landfill. These soils were scheduled to be processed on 11/26/90 by Alaska Pollution Control.

Former Staff

12/26/1990

Update or Other Action

ADEC 12/26/90 letter to Chevron USA requesting additional information concerning: tightness test results for reinstalled waste oil UST, and clarification of how the used oil system failed.

Former Staff

11/19/1992

Update or Other Action

RP removed 5 tanks (3 gasoline, 1 used oil, and 1 heating oil). 2,556 tons of contaminated soils were thermally treated at ASR. Contamination remains. RP installed vapor extraction lines to help remediate remaining contamination.

Former Staff

1/22/1993

Document, Report, or Work plan Review - other

Water well survey reveals several drinking water wells within 1/4 mile. Requested, at a minimum, that the two nearest down gradient wells be sampled.

Former Staff

3/28/1995

Document, Report, or Work plan Review - other

Reviewed and approved corrective action plan.

Former Staff

11/16/1995

Document, Report, or Work plan Review - other

Reviewed a release investigation.

Former Staff

12/21/1995

Document, Report, or Work plan Review - other

Reviewed and approved a corrective action plan.

Former Staff

11/20/1997

Update or Other Action

ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: CHEVRON PRODUCTS COMPANY, INC/PERMITS DESK

Former Staff

6/24/1999

Update or Other Action

Soil vapor extraction system begins operation.

Robert Weimer

1/30/2001

Meeting or Teleconference Held

Annual meeting with ADEC & Chevron to review Alaska sites and set goals for 2001. See meeting notes for additional details.

Linda Nuechterlein

5/8/2003

Document, Report, or Work plan Review - other

ADEC approves workplan for the installations of geoprobe borings to help delineate product plume.

Robert Weimer

5/22/2003

Document, Report, or Work plan Review - other

Semi-annual groundwater monitoring found gasoline product in MW-5, 3.2 mg/l benzene in MW-7, and 0.11 mg/l in off property monitoring well MW-8.

Robert Weimer

6/19/2003

Offsite Soil or Groundwater Disposal Approved

Approved soils to ASR for thermal treatment

Robert Weimer

9/11/2003

Document, Report, or Work plan Review - other

ADEC approves workplan to install 3 additional on property monitoring wells and 1 off property monitoring well to help define the extent of dissolved gasoline contamination in the groundwater, and the extent of the gasoline product on the groundwater. Consultant is also to conduct a drinking water well search in the area.

Robert Weimer

8/10/2004

Document, Report, or Work plan Review - other

June 10, 2004 groundwater sampling. Up to 3.4 mg/l DRO, 70.0 mg/l GRO, and 2,000 ug/l benzene in groundwater. Contamination levels appear to be generally stable.

Robert Weimer

8/23/2004

Document, Report, or Work plan Review - other

Second quarter 2004 remediation system status report. Soil vapor extraction system operated 57% of the time, it removed 3.7 pounds of GRO during this quarter.

Robert Weimer

11/23/2004

Document, Report, or Work plan Review - other

September 22, 2004 groundwater sampling. Up to 7.2 mg/l DRO, 68 mg/l GRO, and 2,400 ug/l benzene in groundwater. Contamination levels appear to be generally decreasing.

Robert Weimer

12/10/2004

Document, Report, or Work plan Review - other

Third quarter 2004 remediation system status report. Soil vapor extraction system operated 93% of the time, it removed 69.5 pounds of GRO during this quarter. To date, the remediation system has removed 10,034 pounds of GRO and 1705 pounds of BTEX.

Robert Weimer

2/7/2005

Document, Report, or Work plan Review - other

Fourth quarter 2004 remediation system status report. Soil vapor extraction system operated 100% of the time, it removed 38.9 pounds of GRO and 5.8 pounds of BTEX during this quarter. To date, the remediation system has removed 10,073 pounds of GRO and 1,710 pounds of BTEX.

Robert Weimer

3/17/2005

Document, Report, or Work plan Review - other

ADEC letter approving workplan to install 3 monitoring wells on the adjacent property. ADEC letter requests additional monitoring wells down gradient of MW-12 to help define the extent of the groundwater plume. The last monitoring event of 9/22/04 found 2.3 mg/l DRO and 160 ug/l benzene in MW-12. Discussed this with RP's consultant.

Robert Weimer

4/11/2005

Update or Other Action

ADEC approves request for extension to July/August 2005 to install furthest down gradient monitoring wells.

Robert Weimer

5/23/2005

Offsite Soil or Groundwater Disposal Approved

Reviewed and approved workplan for thermal treatment of 17 drums of soil generated during recent installation of additional monitoring wells.

Robert Weimer

6/13/2005

Document, Report, or Work plan Review - other

First quarter 2005 remediation system status report. Soil vapor extraction system operated 71% of the time, it removed 6.1 pounds of BTEX during this quarter. To date, the remediation system has removed 10,073 pounds of GRO and 1,717 pounds of BTEX.

Robert Weimer

6/21/2005

Document, Report, or Work plan Review - other

Reviewed plan to relocated treatment shed to the northwest corner of the property.

Robert Weimer

7/28/2005

Document, Report, or Work plan Review - other

May 18, 2005 groundwater sampling. Up to 2.6 mg/l DRO, 65 mg/l GRO, and 960 ug/l benzene in groundwater. Contamination levels appear to be generally decreasing. Groundwater flow direction is to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined.

Robert Weimer

8/4/2005

Meeting or Teleconference Held

Meeting with Chevron to discuss future site work. They are to sample the two highest contaminated wells for EDB and 1,2-DCA. The operating remediation is to be upgraded in 2006/2007. They will submit a workplan for the installation of an additional monitoring well to define the extent of the groundwater contamination. They confirmed that the remediation shed has been moved and the remediation system is operating again.

Robert Weimer

8/10/2005

Document, Report, or Work plan Review - other

Received updated site map on the new location of the remediation shed. It has been moved to the northwest corner of the property. The system has been restarted.

Robert Weimer

8/12/2005

Document, Report, or Work plan Review - other

Second quarter 2005 remediation system status report. Soil vapor extraction system operated 94% of the time, it removed 5.5 pounds of GRO and 10.3 pounds of BTEX during this quarter. To date, the remediation system has removed 10,082 pounds of GRO and 1,725 pounds of BTEX. Recovery rates have increased since the previous quarter.

Robert Weimer

8/25/2005

Document, Report, or Work plan Review - other

2005 Off-Property Well Installation Report. In May 2005 three monitoring wells were installed on the down gradient property just west of the Chevron property. Soil and groundwater samples were collected. Up to 2,800 mg/kg DRO, 110 mg/kg GRO, and 0.04 mg/kg benzene was found in the soil. Up to 19.0 mg/l DRO, 0.22 mg/l GRO, and 44 ug/l benzene was found in the groundwater.

Robert Weimer

9/21/2005

Meeting or Teleconference Held

Discussed additional monitoring wells with RPs consultant. They are having trouble getting access and with utilities in the areas. They will work on it and keep the ADEC posted.

Robert Weimer

11/28/2005

Document, Report, or Work plan Review - other

Third quarter 2005 remediation system status report. Soil vapor extraction system operated 95% of the time, it removed 15 pounds of GRO and 5.5 pounds of BTEX during this quarter. To date, the remediation system has removed 10,097 pounds of GRO and 1,731 pounds of BTEX. Recovery rates have increased slightly since the previous quarter.

Robert Weimer

12/2/2005

Update or Other Action

ADEC received notification that the additional off property well is to be installed in early 2006 once property access is granted.

Robert Weimer

12/16/2005

Document, Report, or Work plan Review - other

September 28, 2005 groundwater sampling. Up to 1,400 mg/l DRO, 65 mg/l GRO, and 790 ug/l benzene in groundwater. Contamination levels appear to be generally decreasing. Groundwater flow direction is to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44 to 59 feet below ground surface.

Robert Weimer

1/30/2006

Document, Report, or Work plan Review - other

Fourth quarter 2005 remediation system status report. Soil vapor extraction system operated 82% of the time, it removed 3.9 pounds of GRO and 5.8 pounds of BTEX during this quarter. To date, the remediation system has removed 10,101 pounds of GRO and 1,737 pounds of BTEX. Recovery rates are about the same as the previous quarter.

Robert Weimer

2/9/2006

Meeting or Teleconference Held

Meeting with Chevron to discuss future site work. They are to sample the two highest contaminated wells for EDB and 1,2-DCA in 2006. They are having access problems with placing additional monitoring wells off property. Remediation system upgrade scheduled for 2007.

Robert Weimer

3/22/2006

Update or Other Action

Chevron provided information documenting difficulty in getting access to place down gradient wells that have been requested to help define the extent of the groundwater contamination.

Robert Weimer

8/16/2006

Document, Report, or Work plan Review - other

May 17, 2006 groundwater sampling. Up to 720 mg/l DRO, 64 mg/l GRO, and 640 ug/l benzene in groundwater. Contamination levels appear to be generally decreasing. Groundwater flow direction is to the west by northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 45 to 60 feet below ground surface.

Robert Weimer

8/22/2006

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of purge water.

Robert Weimer

9/8/2006

Update or Other Action

ADEC approves reduction in groundwater monitoring. Monitoring wells MW-6, MW-10, MW-13, and MW-15 are to be annual. MW-2 is to be sampled in place of paved over MW-11. Also suspend MTBE sampling in all wells.

Robert Weimer

10/16/2006

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of one drum of purge water.

Robert Weimer

11/8/2006

Document, Report, or Work plan Review - other

Second quarter 2006 Remediation System Status Report. Soil Vapor Extraction system is currently off (since March 2006) and is scheduled to restart in August 2006. A work plan to upgrade the system is to be submitted in the future.

Robert Weimer

11/8/2006

Document, Report, or Work plan Review - other

First quarter 2006 Remediation System Status Report. System operated 99% of this quarter. Soil Vapor Extraction system was turned off on March 2006 due to electrical problems and is scheduled to restart in August 2006. A work plan to upgrade the system is to be submitted in the future.

Robert Weimer

4/2/2007

Meeting or Teleconference Held

Meeting with RP to discuss site. They are to continue with quarterly groundwater monitoring and sampling. RP plans to replace some wells, do more release investigation, and enhance the system in 2008.

Robert Weimer

4/3/2007

Document, Report, or Work plan Review - other

September 23, 2006 groundwater sampling. Up to 130 mg/l DRO, 45 mg/l GRO, and 270 ug/l benzene in groundwater. Contamination levels appear to be generally decreasing. Groundwater flow direction is to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 41.3 to 57.6 feet below ground surface.

Robert Weimer

4/11/2007

Document, Report, or Work plan Review - other

Third quarter 2006 Remediation System Status Report. Soil Vapor Extraction system is currently off (since March 2006) and is scheduled to restart in October 2006. A work plan to upgrade the system is to be submitted in the future.

Robert Weimer

5/3/2007

Update or Other Action

ADEC approves abandoning monitoring wells MW-1, MW-2, MW-3, and MW-11 which are in the area of the proposed new building on the property. Replacement monitoring wells will be evaluated later. ADEC requests that the RP have a qualified person on site during excavation activities to assess excavated soil for contamination and be any contaminated soil encountered be properly stored/treated/disposed of in an approved manner. ADEC also requests a submittal by July 1, 2007 of an evaluation of the indoor air pathway into the proposed structure and the existing building to the west of the property. Engineering controls and/or active vapor recovery may be necessary.

Robert Weimer

5/21/2007

Document, Report, or Work plan Review - other

Fourth quarter 2006 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system broke down on November 23, 2006, and is currently down for repairs. During the December 2006 site visit, the SVE line were found to be frozen. A work plan to upgrade the system is to be submitted in the future.

Robert Weimer

6/1/2007

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of two drums of purge water.

Robert Weimer

6/18/2007

Update or Other Action

ADEC approves installation of a multi-level soil vapor probe to help assess soil vapor levels at the site.

Robert Weimer

7/2/2007

Document, Report, or Work plan Review - other

ADEC approves sampling plan for the soils to be excavated during the building work this summer.

Robert Weimer

7/11/2007

Offsite Soil or Groundwater Disposal Approved

ADEC approves thermal treatment 4 drums of contaminated soil at ASR. The soil was generated during the installation of the vapor probe well.

Robert Weimer

7/13/2007

Offsite Soil or Groundwater Disposal Approved

ADEC approves thermal treatment of one stockpile and off property disposal of another stockpile.

Robert Weimer

7/16/2007

Update or Other Action

ADEC approves the storage of potentially contaminated soil at ASR while awaiting sampling.

Robert Weimer

7/20/2007

Offsite Soil or Groundwater Disposal Approved

ADEC approves thermal treatment of one stockpile (150 cubic yards) and off property disposal of another stockpile (300 cubic yards).

Robert Weimer

7/23/2007

Site Visit

Site visit to observe excavation activities and the removal of the recently discovered two underground storage tanks (USTs). The USTs are two buried fuel tanker trailers. Some soil is also in the tanks from two missing access ports. On July 23, 2007 two buried tanker truck tanks were encountered in the southern portion of the property near the intersection of Fireweed and C Street during the excavation of the building footers. 1,740 gallons of contaminated water and 174 gallons of fuel and some contaminated soil were removed from the buried tankers. Confirmation soil samples were collected from the buried tanker excavation had up to 3.27 mg/kg benzene, 665 mg/kg GRO, non-detect (<20 mg/kg) DRO, non-detect (<0.126 mg/kg) PCBs, 5.62 mg/kg Arsenic, 33.9 mg/kg Chromium, 31.6 mg/kg lead, non detect for solvents and PAHs, and non-detect (<50 mg/kg) RRO.

Robert Weimer

7/31/2007

Document, Report, or Work plan Review - other

First quarter 2007 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system broke down on November 23, 2006, and is currently down for repairs. During the December 2006 site visit, the SVE line were found to be frozen. A work plan to upgrade the system is to be submitted in the future.

Robert Weimer

8/21/2007

Offsite Soil or Groundwater Disposal Approved

Approved thermal treatment of 30.21 tons of contaminated soil that was removed from the inside of the two recently discovered tanks.

Robert Weimer

8/23/2007

Update or Other Action

ADEC requests that during construction groundwater monitoring continue at the site in all accessible wells.

Robert Weimer

10/16/2007

Document, Report, or Work plan Review - other

Second quarter 2007 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system broke down on November 23, 2006, and is currently down for repairs. During the December 2006 site visit, the SVE line were found to be frozen. A work plan to upgrade the system is to be submitted in the future. During site construction one of the remedial wells (MW-2) was damaged. Electrical panel is also being relocated.

Robert Weimer

10/17/2007

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of one drum of contaminated purge water.

Robert Weimer

2/4/2008

Document, Report, or Work plan Review - other

September 27, 2007 groundwater sampling. Up to 1.4 mg/l DRO, 0.4 mg/l GRO, and 100 ug/l benzene in groundwater. Only the 5 off-property monitoring wells were sampled during this sampling event. Contamination levels appear to be generally decreasing. Groundwater flow direction is to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 41.41 to 58.09 feet below ground surface.

Robert Weimer

3/3/2008

Document, Report, or Work plan Review - other

Third quarter 2007 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system broke down on November 23, 2006, and is currently down for repairs. During the December 2006 site visit, the SVE line were found to be frozen. A work plan to upgrade the system is to be submitted in the future. During site construction one of the remedial wells (MW-2) was damaged. Electrical panel is also being relocated. Chevron will attempt to restart the system during the fourth quarter of 2007.

Robert Weimer

3/5/2008

Meeting or Teleconference Held

Meeting with Chevron and their consultants. Chevron to conduct and indoor air evaluation for this site. They will evaluate active remediation at this site. They will also propose replacement monitoring wells. They plan additional assessment of the downgradient property.

Robert Weimer

5/1/2008

Document, Report, or Work plan Review - other

Approve workplan for additional soil and groundwater delineation. The workplan proposes to drill and sample 4 soil boring and to complete on as a monitoring well on the adjacent property. The other 3 soil borings will have groundwater samples collected from them and they may be completed as a monitoring well if they are found to be contaminated. Additional soil sampling and monitoring wells, beyond what is proposed in this workplan, will be required in the future to define the extent of the contamination.

Robert Weimer

5/1/2008

Document, Report, or Work plan Review - other

Fourth quarter 2007 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system broke down on November 23, 2006, and is currently down for repairs. During the December 2006 site visit, the SVE line were found to be frozen. A work plan to upgrade the system is to be submitted in the future. During site construction one of the remedial wells (MW-2) was damaged. Electrical panel is also being relocated. Chevron will restart the system during the first quarter of 2008.

Robert Weimer

5/21/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves the direct haul to Emerald Alaska for treatment of contaminated water generated during the installation of off property monitoring wells.

Robert Weimer

6/10/2008

Exposure Tracking Model Ranking

Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site.

Robert Weimer

6/10/2008

Exposure Tracking Model Ranking

Intitial Ranking Complete for Source Area: 78072 (Autogenerated Action)

6/24/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves thermal treatment of 5 super sacks of contaminated soil drill cutting.

Robert Weimer

7/30/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of drums of contaminated purge water.

Robert Weimer

9/2/2008

Document, Report, or Work plan Review - other

Approve workplan for additional soil and groundwater delineation. The workplan proposes to drill and sample 2 soil borings on the adjacent property and to complete them as monitoring wells if contamination is found at that location. Additional soil sampling and monitoring wells, beyond what is proposed in this workplan, will be required in the future to define the extent of the contamination.

Robert Weimer

9/11/2008

Site Visit

At the request of the project manager, the quality assurance officer was onsite during soil boring and monitoring well installation activiites to oversee compliance with ADEC approved work plans. Not deviaitons were noted to the approved work plan.

Brenton Porter

9/24/2008

Offsite Soil or Groundwater Disposal Approved

Approved thermal treatment of 3 supersacks of contaminated drill cuttings.

Robert Weimer

9/30/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of drums of contaminated purge water.

Robert Weimer

11/25/2008

Document, Report, or Work plan Review - other

First quarter 2008 Remediation System Status Report. Soil Vapor Extraction system was restarted on November 21, 2006. The system was repaired and began operation in early 2008, but then was shut down again due to electrical issues. Chevron plans to restart the system in June 2008. A work plan to upgrade the system is to be submitted in the future.

Robert Weimer

11/26/2008

Document, Report, or Work plan Review - other

May 17, 2008 groundwater sampling. Up to 6.6 mg/l DRO, 0.1 mg/l GRO, and 20 ug/l benzene in groundwater. Only the 2 off-property monitoring wells were sampled during this sampling event. Contamination levels increased in 1 of the 2 monitoring wells sampled. Groundwater flow direction is to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 43.86 to 56.4 feet below ground surface.

Robert Weimer

12/5/2008

Document, Report, or Work plan Review - other

Review of Soil Excavation and Vapor Barrier Installation Report. The report documented The abandonment of monitoring wells MW-1, MW-2, MW-3, MW-10, and MW-11 in May/July 2007. A multi-level soil vapor well was installed on June 22, 2007. Vapor samples were collected at 5 and 40 feet below ground surface had benzene up to 4.1 ppbv which exceeded the EPA screening level of 0.98 ppbv. During the construction of the hotel Chevron's consultant was onsite to field screen and sample excavated soil for reuse and/or off property treatment/disposal. 730 tons of contaminated soil was thermally treated. On July 26, 2007 two buried tanker truck tanks were encountered in the southern portion of the property during the excavation of the building footers. 1,740 gallons of contaminated water and 174 gallons of fuel and some contaminated soil were removed from the buried tankers. Confirmation soil samples were collected from the buried tanker excavation had up to 3.27 mg/kg benzene, 665 mg/kg GRO, non-detect (<20 mg/kg) DRO, non-detect (<0.126 mg/kg) PCBs, 5.62 mg/kg Arsenic, 33.9 mg/kg Chromium, 31.6 mg/kg lead, non detect for solvents and PAHs, and non-detect (<50 mg/kg) RRO. On September 5, 2007 a vapor barrier was installed over the building footers, base of the building, and foundation, but no active ventilation was installed under the building.

Robert Weimer

2/25/2009

Meeting or Teleconference Held

Meeting with Chevron and their consultants. Chevron to conduct and indoor air evaluation for this site. Chevron is to add monitoring well MW4 to BTEX/GRO sampling. Chevron is to provide a release investigation plan and a corrective action plan and to look at sample location data for the southern tanks location. Chevron to collect MNA data and look for any rebound in groundwater contamination. Chevron may need to restart the remediation system and hook up monitoring well MW7 location to the system.

Robert Weimer

4/3/2009

Document, Report, or Work plan Review - other

September 14, 2008 groundwater sampling. Up to 55 mg/l DRO, 34 mg/l GRO, and 100 ug/l benzene in groundwater. Four on-property monitoring well and six off-property monitoring wells were sampled during this sampling event. Contamination levels increased in 4 of the 10 monitoring wells sampled. Groundwater flow direction is to the west by northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 41.36 to 60.02 feet below ground surface.

Robert Weimer

4/3/2009

Document, Report, or Work plan Review - other

In June and September 2008, five additional soil borings were installed at off property locations to the north and west of the Chevron property. Up to 1900 mg/kg DRO, 120 mg/kg GRO, and <0.05 mg/kg benzene in the soil samples. Higher soil contamination may exist since the highest field screening depths were not sampled in some of the soil borings (SB-2, SB-3, and MW-17). Two of the soil borings were completed as monitoring wells. Up to 1000 mg/l DRO, 1.3 mg/l GRO, and 40 ug/l benzene in the 5 groundwater samples collected from the borings/new monitoring wells. Some water samples are biased low due to not being preserved in the field.

Robert Weimer

6/15/2009

Update or Other Action

ADEC letter requesting a release investigation workplan by August 1, 2009 to define the extent of the soil and possible groundwater contamination at the southern tank location. The letter also requests by August 1, 2009 a replacement monitoring well for MW-4 that was found to have been destroyed.

Robert Weimer

6/30/2009

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of drums of contaminated purge water.

Robert Weimer

7/22/2009

Document, Report, or Work plan Review - other

Fourth quarter 2008 Remediation System Status Report. Soil Vapor Extraction system was restarted after June 2008. During this quarter the system operated 99% of the time. The current system only extracts from one location MW-5. Recovery from this limited area was non-detect. A work plan to upgrade the system is to be submitted in the future.

Robert Weimer

7/24/2009

Document, Report, or Work plan Review - other

First quarter 2009 Remediation System Status Report. Soil Vapor Extraction system was restarted after June 2008. During this quarter the system operated 100% of the time. The current system only extracts from one location MW-5. Recovery from this limited area was non-detect. A work plan to upgrade the system is to be submitted in the future.

Robert Weimer

10/1/2009

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of drums of contaminated purge water.

Robert Weimer

11/25/2009

Document, Report, or Work plan Review - other

May 29, 2009 groundwater sampling. Up to 68 mg/l DRO, 26 mg/l GRO, and 130 ug/l benzene in groundwater. Four on-property monitoring well and six off-property monitoring wells were sampled during this sampling event. Contamination levels increased in 2 of the 10 monitoring wells sampled. Groundwater flow direction was to the west by northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.22 to 59.79 feet below ground surface.

Robert Weimer

2/19/2010

Document, Report, or Work plan Review - other

May 29, 2009 groundwater sampling. Up to 100 mg/l DRO, 23 mg/l GRO, and 120 ug/l benzene in groundwater. Four on-property monitoring well and six off-property monitoring wells were sampled during this sampling event. Contamination levels increased in 5 of the 10 monitoring wells sampled. Groundwater flow direction was to the west by northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.66 to 60.15 feet below ground surface.

Robert Weimer

3/11/2010

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 3/10/10. MW5 & MW7 are to be sampled for PAH the next monitoring event. Chevron to provide a revised workplan for release investigation at the two tank area. Chevron to evaluate ehnanced monitored natural attenuation or active remediation at the site. We discussed that groundwater samples for volatiles should not be collected with bailers or peristaltic pumps due to the loss of volatiles, Chevron is to provide a workplan specifying how groundwater samples will be collected in the future.

Robert Weimer

2/23/2011

Document, Report, or Work plan Review - other

DEC conditionally approves the work plan to install two replacement monitoring wells, and to collect soil, water, and natural attenuation samples. The modification is that for replacement monitoring well MW-4 that soil samples only need to be collected at the soil/water interface and the highest field reading depths.

Robert Weimer

3/30/2011

Document, Report, or Work plan Review - other

May 11, 2010 groundwater sampling. Up to 11 mg/l DRO, 23 mg/l GRO, and 92 ug/l benzene in groundwater. PAH's above groundwater cleanup levels in monitoring well MW-5. Four on-property monitoring well and five off-property monitoring wells were sampled during this sampling event. Contamination levels increased in 6 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.55 to 60.00 feet below ground surface.

Robert Weimer

4/20/2011

Update or Other Action

ADEC approves request to suspend until further notice the analytical sampling of monitoring well MW-6, MW-15, and MW-17, and reduce analytical sampling of MW-16 to DRO.

Robert Weimer

6/6/2011

Meeting or Teleconference Held

Talked with property owner about the approved plan to install two additional monitoring wells on the property. MW-10R is to replace MW-10 and to assess downgradient of the monitoring wells that were under the hotel building foot print. MW-4R is not to replace MW-4, it is to investigate contamination from the two tanks found to the south of the hotel.

Robert Weimer

8/30/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approved the thermal treatment of 9 drums of contaminated drill cuttings from the August 2011 subsurface investigation.

Robert Weimer

8/30/2011

Document, Report, or Work plan Review - other

September 7, 2010 groundwater sampling. Up to 18 mg/l DRO, 19 mg/l GRO, and 89 ug/l benzene in groundwater. PAH's above groundwater cleanup levels in monitoring well MW-5. Contamination levels increased in 7 of the 10 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.49 to 60.40 feet below ground surface.

Robert Weimer

11/1/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of drums of contaminated purge water.

Robert Weimer

11/28/2011

Document, Report, or Work plan Review - other

April 20, 2011 groundwater sampling. Up to 11 mg/l DRO, 20 mg/l GRO, and 87 ug/l benzene in groundwater. PAH's above groundwater cleanup levels in monitoring well MW-5. Contamination levels increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 45.36 to 60.24 feet below ground surface.

Robert Weimer

2/29/2012

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/28/12. Semi-annual groundwater monitoring is to continue and well monuments are to be repaired. They will add RRO analysis in monitoring wells 5, 7, 8, 9, 10R, 12, 13, 14, and 16 for the next monitoring event. They are to add a rose diagram to the monitoring figure. They are to submit a corrective action plan for the remaining soil and groundwater contamination at the site.

Robert Weimer

10/23/2012

Document, Report, or Work plan Review - other

September 28, 2011 groundwater sampling. Up to 330 mg/l DRO, 16 mg/l GRO, and 75 ug/l benzene in groundwater. Contamination levels increased in 7 of the 8 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 40.76 to 58.52 feet below ground surface.

Robert Weimer

10/29/2012

Document, Report, or Work plan Review - other

In June 2011 two additional monitoring wells were installed on the property. MW-10R is to replace MW-10 and to assess downgradient of the monitoring wells that were under the hotel building foot print. MW-4R is not to replace MW-4, it is to investigate contamination from the two tanks found to the south of the hotel. MW-10R had up to 190 mg/kg GRO, 45 mg/kg DRO, and 0.84 mg/kg benzene in the soil samples collected. MW-4R was non-detect for GRO, DRO, and benzene in the soil samples collected.

Robert Weimer

10/29/2012

Conceptual Site Model Submitted

Conceptual Site Model identified soil, groundwater, and air exposure routes.

Robert Weimer

2/26/2013

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/26/13. Chevron proposes to continue semi-annual groundwater monitoring, is approved to remove the unused SVE shed, provide missing reports, and provide a corrective action plan for the remaining soil and groundwater contamination at the site. They are to add a rose diagram to the monitoring figure. The next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data.

Robert Weimer

3/12/2013

Site Visit

Site visit to observe current site conditions.

Robert Weimer

4/12/2013

Document, Report, or Work plan Review - other

May 21, 2012 groundwater sampling. Up to 39 mg/l DRO, 17 mg/l GRO, and 61 ug/l benzene in groundwater. Contamination levels increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 41.28 to 59.00 feet below ground surface.

Robert Weimer

5/17/2013

Update or Other Action

Consultant called that some of the groundwater samples recently collected were over temperature. They will flag the results as potentially biased low, but still can probably use the data for comparison basis of the purge/no-purge results.

Robert Weimer

11/14/2013

Document, Report, or Work plan Review - other

September 18, 2012 groundwater sampling. Up to 23 mg/l DRO, 15 mg/l GRO, 0.24 mg/l benzo(a)pyrene, and 68 ug/l benzene in groundwater. Contamination levels increased in 7 of the 11 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.24 to 60.12 feet below ground surface. Samples were collected using a bailer with out purging the wells prior to sampling. Because samples were collected using a bailer the volatile sample results are biased low.

Robert Weimer

2/11/2014

Document, Report, or Work plan Review - other

May 6, 2013 groundwater sampling. Up to 7.5 mg/l DRO, 21.2 mg/l GRO, and 58.8 ug/l benzene in groundwater. Contamination levels increased in 2 of the 9 monitoring wells sampled. Groundwater flow direction was to the west. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.24 to 59.90 feet below ground surface. Samples were collect by both no-purge (Hydrasleeve) and purge (bladder pump) methods. The sampling interval for the hydrasleeve was not documented in the field notes. The sample interval for the bladder pump was not documented in 4 of the wells sampled and the sample depth was not consistent where it was documented, in those it was between 3.15 and 10.21 feet below the groundwater surface. MW-16 had DRO at 7.5 mg/l with no-purge and 2.0 mg/l with purge. Because the sample depths were not consistent between the no-purge and purge methods we are not able to say that the two methods give consistent results for this site.

Robert Weimer

2/27/2014

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/27/2014. Because of problems with last year’s purge/no-purge sampling the next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data or they will switch to no purge for future sampling events. We discussed that the groundwater samples needs to be collected as close as possible to the soil/water interface, with the pump intake within a foot of the soil/water interface at the time of the sampling. After reviewing the results of the May 2014 groundwater sampling event the consultant may be requesting a reduction in ground water monitoring or DEC may request active treatment and/or additional monitoring wells to define the nature and extent of the contamination. In the future they will need to evaluate for a diving plume on the monitoring wells far from the release point. The consultant will make sure that their site reports are complete in accordance with DEC’s 9/23/2009 Site Characterization Work Plan and Reporting Guidance for Investigation of Contaminated Sites.

Robert Weimer

5/5/2014

Document, Report, or Work plan Review - other

September 16, 2013 groundwater sampling. Up to 7.0 mg/l DRO, 22.7 mg/l GRO, 0.336 mg/l naphthalene, and 54.9 ug/l benzene in groundwater. Contamination levels increased in 4 of the 10 monitoring wells sampled. Groundwater flow direction was to the west. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 43.91 to 59.96 feet below ground surface. Samples were collect by no-purge (Hydrasleeve) method. The sampling interval for the hydrasleeve was not documented in the field notes the results are considered biased low.

Robert Weimer

9/18/2014

Offsite Soil or Groundwater Disposal Approved

ADEC approves offsite treatment of one drum of contaminated purge water.

Robert Weimer

1/8/2015

Document, Report, or Work plan Review - other

May 2-5, 2014 groundwater sampling. Up to 3.5 mg/l DRO, 21.1 mg/l GRO, 0.241 mg/l naphthalene, and 42.5 ug/l benzene in groundwater. PAH results are biased low because they were analyzed outside of holding times. Contamination levels increased in 4 of the 10 monitoring wells sampled. Groundwater flow direction was to the west. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 43.50 to 59.56 feet below ground surface. Samples were collect by both no-purge (Hydrasleeve) and purge (bladder pump) methods. The sampling interval were within the top of the water column except for monitoring well MW5 that was not documented for the purge method. For this sampling event the no purge sample appears to give higher concentrations than the purge method (MW-7 had 21.1 mg/l GRO vs. 12.5 mg/l GRO).

Robert Weimer

5/13/2015

Document, Report, or Work plan Review - other

September 3, 2014 groundwater sampling. Up to 5.3 mg/l DRO, 10.0 mg/l GRO, 0.25 mg/l naphthalene, and 54.2 ug/l benzene in groundwater. PAH results are biased low because they were analyzed outside of holding times. Contamination levels increased in 5 of the 11 monitoring wells sampled. Groundwater flow direction was to the west. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 43.81 to 59.96 feet below ground surface. Samples were collect by no-purge (Hydrasleeve) method. The sampling interval was not within the top of the water column in monitoring wells (MW5, MW6, MW8, MW12, MW13, and MW14)as required. The results in those monitoring wells are considered biased low and can't be used for trends, characterization, and site closure evaluation.

Robert Weimer

10/2/2015

Document, Report, or Work plan Review - other

April 15, 2015 groundwater sampling. Up to 5.9 mg/l DRO, 20.0 mg/l GRO, 0.84 mg/l naphthalene, and 40.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for Benzo(b)fluoranthene, Benzo(a)pyrene, and Dibenz(a,h)anthracene and were the highest concentrations since May 2012. Contamination levels increased in 4 of the 7 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.23 to 60.24 feet below ground surface. Samples were collect by no-purge (Hydrasleeve) method.

Robert Weimer

1/25/2016

Update or Other Action

DEC approves extension request to submit the 2nd semi-annual 2015 groundwater monitoring report by February 29, 2016.

Robert Weimer

11/15/2016

Document, Report, or Work plan Review - other

October 29, 2015 groundwater sampling. Up to 5.1 mg/l DRO, 19.0 mg/l GRO, 0.84 mg/l naphthalene, and 13.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for Naphthalene. Contamination levels increased in 7 of the 12 monitoring wells sampled. Groundwater flow direction was to the west by northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.27 to 60.14 feet below ground surface. Samples were collect by no-purge (Hydrasleeve) method at the top of the water column.

Robert Weimer

3/2/2017

Document, Report, or Work plan Review - other

April 19, 2016 groundwater sampling. Up to 4.9 mg/l DRO, 20.0 mg/l GRO, 21 ug/l naphthalene, and 31.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for Benzo(a)anthracene, Benzo(a)pyrene, and Dibenzo(a,h)anthracene. Contamination levels increased in 8 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.68 to 60.01 feet below ground surface. Volatile samples were collect by no-purge (Hydrasleeve) method and other samples with a bailer at the top of the water column.

Robert Weimer

6/14/2017

Document, Report, or Work plan Review - other

September 23, 2016 groundwater sampling. Up to 5.8 mg/l DRO, 18.0 mg/l GRO, 8.9 ug/l naphthalene, and 35.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for Benzo(a)anthracene, Benzo(a)pyrene, Benzo(a)Fluoranthene, Indeno(1,2,3-cd)pyrene, and Dibenzo(a,h)anthracene. Contamination levels increased in 6 of the 10 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.79 to 60.36 feet below ground surface. Volatile samples were collect by no-purge (Hydrasleeve) method and other samples with a bailer at the top of the water column.

Robert Weimer

6/15/2017

Update or Other Action

DEC concurs with the 2016 reports recommendation to suspend, until further notice, the sampling of monitoring well MW-4R. DEC requests the submittal of a detailed work plan by August 1, 2017 for future groundwater sampling at this site. This is to include the sampling after purging the monitoring wells using a bladder pump or positive displacement pump with the well intake within the top foot of the water column at the time of the sampling. The sample analysis is to include the full VOCs (8260), GRO(AK101), and DRO(AK102) in all monitoring wells, and PAHs(8270) in select monitoring wells.

Robert Weimer

9/7/2017

Document, Report, or Work plan Review - other

ADEC conditionally approves GHD’s August 1, 2017 Groundwater Monitoring and Sampling Work Plan. The work plan proposes to collect groundwater samples from select site monitoring wells. The work plan is approved under the condition that PAH analysis includes monitoring well MW-16 in addition to the ones proposed in the work plan.

Robert Weimer

4/2/2018

Document, Report, or Work plan Review - other

May 8, 2017 groundwater sampling. Up to 16.0 mg/l DRO, 3.9 mg/l GRO, 1.4 ug/l naphthalene, and 34.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for 7 PAH compounds. Contamination levels increased in 9 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Full extent of the groundwater contamination has not yet been determined. Depth to groundwater is 44.11 to 59.99 feet below ground surface. Volatile samples were collect by no-purge (Hydrasleeve) method and other samples with a bailer at the top of the water column except for monitoring wells MW-5, MW-6, and MW-8 where the sample interval was not documented in the field notes.

Robert Weimer

4/20/2018

Document, Report, or Work plan Review - other

October 2, 2017 groundwater sampling. Up to 2.8 mg/l DRO, 12 mg/l GRO, 170 ug/l naphthalene, and 9.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for one PAH compound this monitoring event in the 4 monitoring wells sampled for PAHs. Contamination levels increased in 4 of the 10 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Depth to groundwater is 42.45 to 58.23 feet below ground surface. Volatile samples were collect at the top foot of the water column with a bladder pump after purging.

Robert Weimer

12/12/2018

Document, Report, or Work plan Review - other

May 24, 2018 groundwater sampling. Up to 3.3 mg/l DRO, 17 mg/l GRO, 200 ug/l naphthalene, and 7.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for one PAH compound this monitoring event in the 2 monitoring wells sampled for PAHs. Contamination levels increased in 4 of the 10 monitoring wells sampled. Groundwater flow direction was to the northwest. Contamination extends off property over 300 feet away. Depth to groundwater is 42.16 to 57.81 feet below ground surface. Volatile samples were collect at the top foot of the water column with a bladder pump after purging.

Robert Weimer

1/17/2019

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 78072 1992 UST contamination.

Robert Weimer

6/13/2019

Document, Report, or Work plan Review - other

September 13, 2018 groundwater sampling. Up to 3.6 mg/l DRO, 13 mg/l GRO, 200 ug/l naphthalene, and 6.0 ug/l benzene in groundwater. PAH results exceeded cleanup levels for one PAH compound this monitoring event in the 2 of the 5 monitoring wells sampled for PAHs. Contamination levels increased in 6 of the 9 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 42.29 to 57.89 feet below ground surface. Volatile samples were collect at the top foot of the water column with a bladder pump after purging.

Robert Weimer

9/23/2019

Update or Other Action

Robert Weimer

9/24/2019

Document, Report, or Work plan Review - other

ADEC approves until further notice suspending all sampling of monitoring wells MW-6 and MW-13.

Robert Weimer

3/12/2020

Update or Other Action

ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also all BTEX and VOC sampling needs to include the full 8260 VOC list including naphthalene. ADEC is also requesting that all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions.

Robert Weimer

3/17/2020

Document, Report, or Work plan Review - other

DEC reviewed 2020 groundwater sampling plan and provided the following comments: For all future monitoring events please make sure that the field notes document the measurement of the pump intake that is within the top foot of the water column at the time of the sampling unless the top of the well screened interval is deeper, then in that case from the top foot of that screened interval. For all future monitoring events any monitoring well where BTEX or HVOC sampling is proposed it needs to be the full VOC (method 8260) list, including naphthalene. The field QC samples are per day of sampling at a site. For all future monitoring events all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. For all future monitoring events if a monitoring well is low yield and purges dry then a sample will still need to be collected that monitoring event once the monitoring well has recharged to approximately 80% of its pre-purge volume. If it has not returned to 80% of its pre-purged volume during that sampling day DEC requests that you return to the site early the next day to attempt to collect the water sample.

Robert Weimer

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

11/8/2021

Long Term Monitoring Workplan or Report Review

2021 Second Semi-Annual Groundwater Monitoring event was conducted on September 10, 2021. Groundwater samples were collected from monitoring wells MW-5, MW-7, MW-8, MW-9, MW-10R, MW-12, MW-14, and MW-16. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 49.78 to 67.29 feet below ground surface. DRO, GRO, ethylbenzene, total xylenes, naphthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 1-methylnaphthalene, and 2-methylnaphthalene exceeded cleanup levels during this sampling event with the highest contaminant concentrations observed at MW-7.

Rebekah Reams

6/8/2022

Long Term Monitoring Workplan or Report Review

2022 First Semi-Annual Groundwater Monitoring event was conducted on April 19, 2022. Groundwater samples were collected from monitoring wells MW-5, MW-7, MW-8, MW-9, MW-10R and MW-16. Monitoring wells MW-4R, MW-12, MW-13, MW-14, and MW-17 were frozen and unable to be gauged or sampled. MW-6 was inaccessible due to a large connex box placed over the well. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 50.06 to 67.83 feet below ground surface. DRO, GRO, ethylbenzene, total xylenes, naphthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 1-methylnaphthalene, and 2-methylnaphthalene exceeded cleanup levels during this sampling event with the highest contaminant concentrations observed at MW-7.

Rebekah Reams

9/29/2022

Document, Report, or Work plan Review - other

ADEC provided comments on the Treatment of Purge Water Utilizing Granular Activated Carbon (GAC) at Chevron Environmental Management Company Sites which includes standard operating procedures and breakthrough estimates proposed for use at this site.

Rebekah Reams

12/15/2022

Offsite Soil or Groundwater Disposal Approved

ADEC approved transport of one 55-gallon drum of waste generated during the fall 2022 groundwater monitoring event.

Rebekah Reams

12/29/2022

Long Term Monitoring Workplan or Report Review

2022 Second Semi-Annual Groundwater Monitoring event was conducted on August 22, 2022. Groundwater samples were collected from monitoring wells MW-5, MW-8, MW-9, MW-10R, MW-12, MW-14 and MW-16. Monitoring well MW-6 was inaccessible due to a large connex box placed over the well and monitoring wells MW-7 and MW-17 were inaccessible due to a cars parked over the well. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 50.29 to 67.82 feet below ground surface.

Rebekah Reams

3/29/2023

Long Term Monitoring Workplan or Report Review

ADEC approved the Groundwater Sampling Analyte Reduction Request. This work plan addendum proposes to update the groundwater monitoring schedule to include a revised analyte list for site wells, remove monitoring well MW-6 from the sampling plan, and add MW-15 to the sampling plan. Groundwater monitoring will continue to occur on a semi-annual basis.

Rebekah Reams

12/5/2023

Offsite Soil or Groundwater Disposal Approved

ADEC approved offsite transport of 36 gallons of purge water generated during groundwater monitoring at the site.

Rebekah Reams

6/21/2024

Long Term Monitoring Workplan or Report Review

2023 Second Semi-Annual Groundwater Monitoring event was conducted on August 21, 2023. Groundwater samples were collected from monitoring wells MW-5, MW-7, MW-8, MW-10R, MW-12 through MW-16. Monitoring wells MW-4R, MW-6, MW-9 and MW-17 were not sampled and MW-6 was not gauged due to being covered by a connex box. MW-9 was unable to be accessed due to car parked over. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the northwest and depth to groundwater was 43.32 to 59.57 feet below ground surface.

Rebekah Reams

8/14/2024

Long Term Monitoring Workplan or Report Review

2024 First Semi-Annual Groundwater Monitoring event was conducted on May 2, 2024. Groundwater samples were collected from monitoring wells MW-5, MW-6, MW-8, MW-9, MW-10R, MW-12, MW-13, MW-15 and MW-16. Monitoring wells MW-14 and MW-17 were frozen and could not be sampled, and MW-7 was not able to be accessed because a vehicle was parked over it. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 42.95 to 59.48 feet below ground surface.

Rebekah Reams

8/19/2024

Site Characterization Workplan Approved

ADEC approved the Soil and Groundwater Assessment Work Plan following comment resolution. This work plan proposes to advance 11 soil borings and install a monitoring well to further assess soil and groundwater impacts at the site.

Rebekah Reams

9/24/2024

Site Visit

ADEC conducted a site visit with Chevron and Arcadis personnel to observe site layout, sampling locations, and nearby features.

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

12/29/2024

Long Term Monitoring Workplan or Report Review

2023 First Semi-Annual Groundwater Monitoring event was conducted on April 19, 2023. Groundwater samples were collected from monitoring wells MW-5, MW-8, MW-9, MW-10R, MW-12, and MW-15. Monitoring wells MW-13, MW-14 and MW-16 were not sampled and MW-14 and MW-17 were not gauged due to frozen groundwater in the casing. MW-7 and MW-6 were unable to be accessed due to a parked car and connex located over the wells, respectively. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, and PAHs. Groundwater flow direction was to the north-northwest and depth to groundwater was 48.20 to 66.71 feet below ground surface.

Rebekah Reams

Contaminant Information

Name

Level Description

Media

Comments

Control Type

Type

Details

Requirements

Description

Details

2024 First Semi-Annual Groundwater Monitoring Report

2011 Site Assessment Report

2007 First Semi-Annual Groundwater Monitoring Report

2004 Site Assessment Report

2002 Site Assessment Report

2003 NAPL Plume Delineation Report

2005 Offsite Well Installation Summary Report

2013 Request to Remove Remediation System

2007 First Semi-Annual Groundwater Monitoring Report

1992 Environmental Site Assessment

1992 UST Closure Assessment Report

2000 UST Removal Report

2018 Second Semi-Annual Groundwater Monitoring Report

2018 First Semi-Annual Groundwater Monitoring Report

2017 Second Semi-Annual Groundwater Monitoring Report

2017 First Semi-Annual Groundwater Monitoring Report

No associated sites were found.

Missing Location Data

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Alaska Department of Environmental Conservation

Site Report: Chevron - #6097

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

2024 First Semi-Annual Groundwater Monitoring Report

2011 Site Assessment Report

2007 First Semi-Annual Groundwater Monitoring Report

2004 Site Assessment Report

2002 Site Assessment Report

2003 NAPL Plume Delineation Report

2005 Offsite Well Installation Summary Report

2013 Request to Remove Remediation System

2007 First Semi-Annual Groundwater Monitoring Report

1992 Environmental Site Assessment

1992 UST Closure Assessment Report

2000 UST Removal Report

2018 Second Semi-Annual Groundwater Monitoring Report

2018 First Semi-Annual Groundwater Monitoring Report

2017 Second Semi-Annual Groundwater Monitoring Report

2017 First Semi-Annual Groundwater Monitoring Report

Missing Location Data

State of Alaska Department of Environmental Conservation