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Site Report: Chevron - #2555

Site Name: Chevron - #2555
Address: 920 Gambell St., Anchorage, AK 99501
File Number: 2100.26.004
Hazard ID: 23994
Status: Active
Staff: Rebekah Reams, 9074512144 rebekah.reams@alaska.gov
Latitude: 61.213418
Longitude: -149.871363
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.

Problems/Comments

Gasoline soil and groundwater contamination was found during the demolition of the service station and the removal of the USTs in 1990, some heavier contamination and solvent contaminaiton were also found, probably associated with old former used oil and fuel oil tanks used at the site in the past. Monitoring wells were installed in 1990, 1991, 1992, and 2002 to help define the extent of the groundwater contamination, which extents off property to the northwest. A drinking water well was identified to the northeast of the site and its water was tested as meeting drinking water standards. In 1992 a soil vapor extraction/air sparging system was installed and began operation on-property. In 1999 an additional soil vapor extraction/air sparging system was installed and began operation across the street to the north. During several events in 2010/2011 magnesium sulfate (Epsom Salt) was injected to help conduct anaerobic biodegradation at the site. Soil vapor monitoring wells were installed in 2009 adjacent to the nearby appartment building to assess for possible vapor intrusion, need further soil vapor sampling for this building. Monitoring of the groundwater continues.

Action Information

Action Date Action Description DEC Staff
7/3/1990 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 78039 Gasoline contamination found during tank removal. Former Staff
7/3/1990 Site Added to Database Former Staff
7/4/1990 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU Date changed DB conversion Former Staff
7/24/1990 Leaking Underground Storage Tank Corrective Action Underway RZA proposes that in-situ soil vapor extraction would be the most viable technique to achieve a site cleanup. Proposed a soil vapor extraction test to evaluate viability of the technique as a part of assessment workplan. Former Staff
7/24/1990 Release Investigation RZA stated that analytical results of soil samples from excavation indicate petroleum hydrocarbon impacts in the area of pump islands, fuel lines, and fill spouts at north end of 2 of the 3 tanks. This includes diesel and heavy oil contamination in the area of former used oil and fuel oil tanks. Former Staff
9/30/1990 Underground Storage Tank Site Characterization or Assessment Reviewed a phase 1 site assessment report. Former Staff
10/19/1990 Update or Other Action Approval of back-filling with the excavated contaminated soils, excluding the "diesel" contaminated soils recently removed. Need a workplan for in-situ groundwater remediation & as-built report upon completion of soil vapor extraction system. Former Staff
10/19/1990 Update or Other Action ADEC letter requesting work plan be submitted for off property monitoring well installation. It should include a sampling plan/proposed hydrogeological study. Need additional borings west of recent tank excavation. Former Staff
12/3/1990 Document, Report, or Work plan Review - other Reviewed a phase 2 site assessment report. Former Staff
1/25/1991 Update or Other Action ADEC letter sent asking for status report and stating that the soil vapor extraction system should have been started up by now. RZA sent letter that the soil vapor extraction system was started up on 2/18/91. The levels of off-gas were from 54 ppm w/full dilution to 476 ppm w/no dilution to vapor stream. Former Staff
7/5/1991 Document, Report, or Work plan Review - other RZA sent in quarterly monitoring results that show BTEX levels above the recommended groundwater cleanup levels at all wells except MW-1 & MS-5. Halogenated volatile organics were detected above cleanup levels in the groundwater at MW-6 & MW-8. Up to 0.371 mg/l methylene chloride, 0.039 mg/l 1,1-dichloroethylene, 0.019 mg/l dichloropropane, 0.011 mg/l trichloroethane, 13 mg/l benzene, 740 mg/l GRO, 270 mg/l DRO, and 76 mg/l TPH. Former Staff
6/2/1992 Document, Report, or Work plan Review - other Approved workplan to use air sparging/soil vapor extraction to remediate contaminated soil and groundwater. Until future notice RP only needs to analyze water samples for BTEX and GRO (gasoline range organics). Former Staff
10/12/1994 Document, Report, or Work plan Review - other Performed a Corrective Action Report review. 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
1/30/2001 Meeting or Teleconference Held Meeting with ADEC & Chevron representatives to review Alaska sites and set goals for 2001. (See meeting notes for additional details about this site.) Linda Nuechterlein
9/29/2001 Document, Report, or Work plan Review - other September 29, 2001 groundwater sampling of site monitoring wells. Up to 111 mg/l GRO, 16,500 ug/l benzene, and 67.1 ug/l MTBE in groundwater. Plume that extends off-property appears to be stable. Robert Weimer
3/17/2003 Update or Other Action Cost recovery bills sent. Robert Weimer
12/18/2003 Update or Other Action Approved reduction in groundwater monitoring at this site. Robert Weimer
6/14/2004 Document, Report, or Work plan Review - other Reviewed quarterly remediation system report. The soil vapor extraction system operated 100% of the time. 5.8 pounds of GRO and 0.8 pounds of benzene were removed in this quarter. Robert Weimer
8/3/2004 Document, Report, or Work plan Review - other June 4, 2004 groundwater sampling of site monitoring wells. Up to 33 mg/l GRO and 2,700 ug/l benzene in groundwater. Plume that extends off-property appears to be stable. Robert Weimer
8/24/2004 Document, Report, or Work plan Review - other Second quarter 2004 remediation system status report. The on property soil vapor extraction system was operational 89% of the time, and it removed 0.3 pounds of benzene during this quarter. The off property soil vapor extraction/air sparge system operated 100% of the time, and it removed 15 pounds of GRO and 1.2 pounds of benzene this quarter. Robert Weimer
12/8/2004 Document, Report, or Work plan Review - other September 27, 2004 groundwater sampling of site monitoring wells. Up to 93 mg/l GRO and 3,500 ug/l benzene in groundwater. Plume that extends off-property appears to be generally stable. Robert Weimer
2/9/2005 Document, Report, or Work plan Review - other Fourth quarter 2004 remediation system status report. The on property soil vapor extraction system was operational 2% of the time, and it removed 0.1 pounds of GRO and 0.1 pounds of benzene during this quarter. The system has now been repaired. The off property soil vapor extraction/air sparge system operated 98% of the time, and it removed 4 pounds of GRO and 1.5 pounds of benzene this quarter. Robert Weimer
6/13/2005 Document, Report, or Work plan Review - other First quarter 2005 remediation system status report. The on property soil vapor extraction system was operational 97% of the time, and it removed 6.1 pounds of GRO and 3.0 pounds of benzene during this quarter. The off property soil vapor extraction/air sparge system operated 97% of the time, and it removed 7 pounds of GRO and 2.6 pounds of benzene this quarter. To date, the off property system has removed 4,098 pounds of GRO and 79 pounds of benzene. Robert Weimer
7/28/2005 Document, Report, or Work plan Review - other May 15, 2005 groundwater sampling of site monitoring wells. Up to 72 mg/l GRO and 1,800 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be generally stable. Robert Weimer
8/4/2005 Update or Other Action Meeting with Chevron to discuss future site work. Because of low recovery rates they are to turn off the existing on-property system. They are to sample the two highest contaminated wells for EDB and 1,2-DCA. Robert Weimer
9/8/2005 Document, Report, or Work plan Review - other Second quarter 2005 remediation system status report. The on property soil vapor extraction system was operational 98% of the time, and it removed 6.4 pounds of GRO and 3.2 pounds of benzene during this quarter. To date, the on property portion of the system has removed 4,911 pounds of GRO and 184 pounds of benzene. The off property soil vapor extraction/air sparge system operated around 66% of the time, and it removed 6 pounds of GRO and 2.4 pounds of benzene this quarter. To date, the off property system has removed 4,104 pounds of GRO and 82 pounds of benzene. Robert Weimer
9/8/2005 Update or Other Action Approved request to suspend operation of the on-property remediation system due to low recovery rates. Chevron will monitor for any rebound in groundwater contamination concentrations. Robert Weimer
11/22/2005 Document, Report, or Work plan Review - other Third quarter 2005 remediation system status report. The on property soil vapor extraction system was operational 100% of the time, and it removed 2.4 pounds of GRO and 1.2 pounds of benzene during this quarter. To date, the on property portion of the system has removed 4,913 pounds of GRO and 185 pounds of benzene. The off property soil vapor extraction/air sparge system operated around 98% of the time, and it removed 24 pounds of GRO and 3 pounds of benzene this quarter. To date, the off property system has removed 4,128 pounds of GRO and 85 pounds of benzene. The on property system was shut down on August 18, 2005. The groundwater will be monitored for any rebound in groundwater contamination levels. Robert Weimer
12/27/2005 Document, Report, or Work plan Review - other September 21, 2005 groundwater sampling of site monitoring wells. Up to 26 mg/l GRO and 1,700 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be generally stable. Depth to groundwater is 17 to 25 feet below ground surface. Robert Weimer
1/31/2006 Document, Report, or Work plan Review - other Fourth quarter 2005 remediation system status report. The off property soil vapor extraction/air sparge system operated around 94% of the time, and it removed 5.9 pounds of GRO and 2.3 pounds of benzene this quarter. To date, the off property system has removed 4,134 pounds of GRO and 87 pounds of benzene. The on property system was shut down on August 18, 2005, it had removed 4,913 pounds of GRO and 185 pounds of benzene. The groundwater will be monitored for any rebound in groundwater contamination levels. 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. Remediation system upgrade scheduled for 2007. Robert Weimer
8/22/2006 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of purge water. Robert Weimer
9/19/2006 Document, Report, or Work plan Review - other May 10, 2006 groundwater sampling of site monitoring wells. Up to 32 mg/l GRO and 2,200 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increasing. Depth to groundwater is 16 to 26 feet below ground surface. Robert Weimer
10/23/2006 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of purge water. Robert Weimer
11/8/2006 Document, Report, or Work plan Review - other Second quarter 2006 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system is currently off due to electrical problems and is scheduled to restart in July 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 was operational at least 33% of the time this quarter. Off property Air Sparge/Vapor Extraction system is currently off due to electrical problems and is scheduled to restart in July 2006. A work plan to upgrade the system is to be submitted in the future. Robert Weimer
11/14/2006 Update or Other Action Received update that the air sparge/soil vapor extraction system is back on-line. Robert Weimer
4/2/2007 Meeting or Teleconference Held Meeting with RP to discuss site. They are to continue with groundwater monitoring and sampling, and operation of the off property remediation system. RP to conduct additional release investigation to the west, and possible pilot testing for alternative remediation technologies at this site. RP working on getting an updated access agreement with the property owner to the north. Robert Weimer
4/4/2007 Document, Report, or Work plan Review - other September 21, 2006 groundwater sampling of site monitoring wells. Up to 71 mg/l GRO and 2,000 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increasing. Depth to groundwater is 16.7 to 25.7 feet below ground surface. Robert Weimer
4/11/2007 Document, Report, or Work plan Review - other Third quarter 2006 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system is currently off due to electrical problems and is scheduled to restart in October 2006. A work plan to upgrade the system is to be submitted in the future. Robert Weimer
5/21/2007 Document, Report, or Work plan Review - other Fourth quarter 2006 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system restarted on November 13, 2006. Because system recovery rate is low, the RP will be looking at enhancing the existing system or implementing an alternative remedial system in 2007. Robert Weimer
6/25/2007 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of two drums of contaminated purge water. Robert Weimer
7/12/2007 Document, Report, or Work plan Review - other ADEC approves the July 6, 2007 MPE Pilot Test and Well Installation Workplan. The plan calls for testing the feasibility of using multi-phase extraction (MPE) to treat the remaining contamination, the installation of two replacement monitoring wells, and installation of three other monitoring wells to help define the extent of the soil and groundwater contamination. Robert Weimer
8/15/2007 Offsite Soil or Groundwater Disposal Approved Approve thermal treatment of 5 drums of contaminated soil drill cuttings and 3 drums of contaminated development water. Robert Weimer
10/12/2007 Document, Report, or Work plan Review - other May 17, 2007 groundwater sampling of site monitoring wells. Up to 98 mg/l GRO and 1,900 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increasing in some of the wells. Depth to groundwater is 16.9 to 26.2 feet below ground surface. Robert Weimer
10/16/2007 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of two drums of contaminated purge water. Robert Weimer
12/7/2007 Document, Report, or Work plan Review - other First quarter 2007 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system restarted on November 13, 2006. Because system recovery rate is low, the RP will be looking at enhancing the existing system or implementing an alternative remedial system in 2007. During this quarter the SVE system was operational 100% of the time and the Air Sparging system was operation 30% of the time. Approximately 8 pounds of GRO were removed this quarter, a total of 2,938 pounds to date. Robert Weimer
2/6/2008 Document, Report, or Work plan Review - other Second quarter 2007 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system restarted on November 13, 2006. Because system recovery rate is low, the RP will be looking at enhancing the existing system or implementing an alternative remedial system in 2007. During this quarter the AS/SVE system was operational 46% of the time. Approximately 6.4 pounds of GRO were removed this quarter, a total of 2,945 pounds to date. 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 continue to operate the off property air sparge/vapor extraction system. They will submit contact information to ADEC to help get site access to conduct pilot testing. Robert Weimer
4/2/2008 Document, Report, or Work plan Review - other Third quarter 2007 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system restarted on November 13, 2006. Because system recovery rate is low, the RP will be looking at enhancing the existing system or implementing an alternative remedial system in 2008/2009. During this quarter the AS/SVE system was operational 83% of the time. Approximately 14.7 pounds of GRO were removed this quarter, a total of 2,960 pounds to date. Robert Weimer
4/14/2008 Document, Report, or Work plan Review - other September 26, 2007 groundwater sampling of site monitoring wells. Up to 87 mg/l GRO and 1,400 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increasing in some of the wells. Depth to groundwater is 15.99 to 26.21 feet below ground surface. Robert Weimer
5/16/2008 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
5/20/2008 Document, Report, or Work plan Review - other Monitoring wells MW-2 and MW-3 were replaced. Also a new monitoring well was installed (MW-22) on the north side of the property to the west of the former service station property. A soil sample was collected from MW-22 at 18 feet below ground surface at the soil/water interface with 0.4 mg/kg benzene, 52 mg/kg GRO, 25 mg/kg DRO, 9.7 mg/kg RRO, and non-detect (<2.5 mg/kg) MTBE. Multi-phase extraction pilot testing and two proposed off property monitoring wells were not installed yet due to site access problems. Robert Weimer
5/20/2008 Conceptual Site Model Submitted Conceptual Site Model identified potential ingestion/dermal soil, ingestion/dermal groundwater, and inhalation of outdoor/indoor air pathways. Robert Weimer
7/21/2008 Document, Report, or Work plan Review - other Fourth quarter 2007 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system restarted on November 13, 2006. Because system recovery rate is low, the RP will be looking at enhancing the existing system or implementing an alternative remedial system in 2008/2009. During this quarter the AS/SVE system was operational 95% of the time. Approximately 9 pounds of GRO were removed this quarter, a total of 2,968 pounds to date. Robert Weimer
7/30/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of drums of contaminated purge water. Robert Weimer
9/9/2008 Site Visit Site visit to observe installation of additional monitoring wells on the downgradient property to the north of the site. Robert Weimer
9/10/2008 Site Visit At the request of the project manager, the quality assurance officer was onsite during well installation activiites to oversee compliance with ADEC approved work plans. Not deviaitons were noted. Brenton Porter
9/10/2008 Site Visit Site visit to observe the installation of pilot testing wells. Robert Weimer
9/10/2008 Update or Other Action Approve transport to and temporary storage of super sacks of drill cuttings from this site at 1441 C Street site. Robert Weimer
9/15/2008 Document, Report, or Work plan Review - other September 15, 2008 groundwater sampling of site monitoring wells. Up to 6.8 mg/l DRO, 100 mg/l GRO, non-detect (<13 ug/l) MTBE, non-detect (<13 ug/l) 1,2-DCA, 0.014 ug/l EDB, and 1,100 ug/l benzene in groundwater. Plume that extends off-property to the northwest and increased in 7 of the 12 monitoring wells sampled. Depth to groundwater is 15.94 to 26.32 feet below ground surface. Robert Weimer
9/25/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves request for thermal treatment of four super sacks of drill cuttings from this site that are currently stored at 1441 C Street site. Robert Weimer
10/2/2008 Document, Report, or Work plan Review - other Between September 29, 2008 and October 2, 2008 a dual phase produce extraction (DPE) pilot test was conducted. The observed vacuum radius of influence was 22.8 feet. The calculated hydraulic conductivity was 35.3 to 43.7 feet per day. 119 pounds of GRO (vapor) were removed in 55 hours, with 4.5 gallons per minute groundwater removal rate. Robert Weimer
10/15/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of drums of contaminated purge water. Robert Weimer
11/10/2008 Document, Report, or Work plan Review - other First quarter 2008 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system restarted on November 13, 2006. Because system recovery rate is low, the RP will be looking at enhancing the existing system or implementing an alternative remedial system in 2009. During this quarter the AS/SVE system was operational 100% of the time. Approximately 7.5 pounds of GRO were removed this quarter, a total of 2,976 pounds to date. Robert Weimer
11/18/2008 Document, Report, or Work plan Review - other Second quarter 2008 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system restarted on November 13, 2006. Because system recovery rate is low, the RP will be looking at enhancing the existing system or implementing an alternative remedial system in 2009. Pilot testing of a multi-phase extraction system was conducted in the fall of 2008. During this quarter the AS/SVE system was operational 100% of the time. Approximately 7.1 pounds of GRO were removed this quarter, a total of 2,983 pounds to date. 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 evaluate treatment of the monitoring well 6 & 22 areas. ADEC to review off property pilot test results. Off property system may remain off line until further notice, with continued collection of monitored natural attenuation parameters. Robert Weimer
3/27/2009 Document, Report, or Work plan Review - other Third quarter 2008 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system restarted on November 13, 2006. Because system recovery rate is low, the RP will be looking at enhancing the existing system or implementing an alternative remedial system in 2009. Pilot testing of a multi-phase extraction system was conducted in the fall of 2008. During this quarter the AS/SVE system was operational 45% of the time. Approximately 5.9 pounds of GRO were removed this quarter, a total of 2,999 pounds to date. Robert Weimer
6/23/2009 Site Visit At the request of Robert Weimer, the project manager, a quality assurance site inspection was conducted on 5/27/09. Upon arival, the consultant had completed sampling most of the welss and field observations were made on sampling the final well, MW-9, using low flow techniques. No deviations from standard sampling practices were observed on that well. A copy of the site inspection report will be placed in the site file and in the QA file. Brenton Porter
6/30/2009 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of purge water. Robert Weimer
7/24/2009 Document, Report, or Work plan Review - other Fourth quarter 2008 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system was shut down on September 2008 due to a faulty LEL meter. Because system recovery rate is low, the RP will be looking at enhancing the existing system or implementing an alternative remedial system in 2009. Pilot testing of a multi-phase extraction system was conducted in the fall of 2008. During this quarter the AS/SVE system was operational 0% of the time. A total of 2999 pounds of GRO have been removed to date. Robert Weimer
8/5/2009 Document, Report, or Work plan Review - other First quarter 2009 Remediation System Status Report. Off property Air Sparge/Vapor Extraction system was shut down on September 2008 due to a faulty LEL meter. During this quarter the AS/SVE system was operational 0% of the time. The system is currently down and the groundwater is being monitored for rebound and monitored natural attenuation. Based on the results an enhanced or replacent treatment system may need to be installed/operated. A total of 2999 pounds of GRO have been removed to date. Robert Weimer
8/21/2009 Document, Report, or Work plan Review - other ADEC requested the following regarding the May 22, 2009 proposed Soil Vapor Assessment Work Plan: Completed building survey form Updated CSM 2 additional vapor locations (NE of building and mid north of building), both within 10 feet of building Use TO-15 full scan analysis Reference 2009 ADEC guidance and screening levels Collect vapor samples over multiple seasons If the building has a basement then the 10.5 foot sample may be a shallow sample May request TO-15 SIM analysis in the future Also need 1,2-DCA and EDB groundwater sampling during the next groundwater sampling event in the historically highest two contaminated monitoring wells. Robert Weimer
9/16/2009 Update or Other Action ADEC requested the following regarding the August 28, 2009 proposed revised Soil Vapor Assessment Work Plan: Copies of all field notes are to be included in the report(s). (ADEC is requesting this on all future Arcadis reports). Field screening and analytical sampling (including field duplicates, methanol trip blanks, and decontamination/equipment blanks) is to be conducted in accordance with the ADEC November 2, 2002 UST Procedures Manual. Soil and groundwater generated is to be treated/disposed of under a separate request. Robert Weimer
10/1/2009 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of drums of contaminated purge water. Robert Weimer
10/29/2009 Site Visit Site visits to observe vapor sampling from the 3 nested vapor wells installed near the adjacent apartment building. Robert Weimer
11/2/2009 Document, Report, or Work plan Review - other October 2009 three multi-layer (5.0, 10.5, and 16 feet below ground surface) vapor monitoring wells were install near the adjacent apartment building that has a daylight basement. The initial vapor sampling on October 29/November 2, 2009 found up to 88 ppbv (6.1 ppbv sreening level) tetrachloroethene (PCE) in the soil gas at the 10.5 feet bgs interval. Robert Weimer
11/24/2009 Offsite Soil or Groundwater Disposal Approved ADEC approves request for treatment of contaminated soil and decon water generated during the installation of the vapor probe wells. Robert Weimer
1/21/2010 Document, Report, or Work plan Review - other May 26, 2009 groundwater sampling of site monitoring wells. Up to 61 mg/l GRO, 3.0 ug/l 1,2DCA, non-detect (<0.01 ug/l) EDB, and 570 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 7 of the 18 monitoring wells sampled. Depth to groundwater is 15.74 to 26.62 feet below ground surface. Robert Weimer
2/23/2010 Document, Report, or Work plan Review - other October 2009 three multi-layer (5.0, 10.5, and 16 feet below ground surface) vapor monitoring wells were install near the adjacent apartment building that has a daylight basement. The initial vapor sampling on October 29/November 2, 2009 found up to 88 ppbv (6.1 ppbv sreening level) tetrachloroethene (PCE) in the soil gas at the 10.5 feet bgs (highest in VP-3). The PCE also exceeded screening levels at 5.0 feet bgs and 10.5 feet bgs in all 3 vapor probes. The second vapor sampling conducted on February 24, 2010 had up to 11 ppbv (6.1 ppbv screening level) tetrachloroethene (PCE) in the soil gas at the 10.5 feet bgs interval (VP-3). Robert Weimer
2/26/2010 Document, Report, or Work plan Review - other September 14-16, 2009 groundwater sampling of site monitoring wells. Up to 54 mg/l GRO, non-detect (<3.0 ug/l) 1,2DCA, non-detect (<0.01 ug/l) EDB, and 650 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 8 of the 17 monitoring wells sampled. Depth to groundwater is 16.41 to 26.76 feet below ground surface. The geochemical analysis conducted indicates that anaerobic biodegradation is currently occuring at the site. Robert Weimer
3/4/2010 Document, Report, or Work plan Review - other Reviewed Enhanced Anaerobic Bio-Oxidation Pilot Test Workplan and discusses with RP's consultant. They will submit a revised workplan soon for approval. Robert Weimer
3/10/2010 Meeting or Teleconference Held Meeting with Chevron and their consultants. MW6 and MW22 is to be sampled for PAH the next monitoring event. DEC is to issue approval letter on the revised Bio-Oxidation Pilot Test Workplan. The results of the 2nd vapor probe sampling event is to be submitted soon. Arcadis is to send staff over to copy the September 1990 Subsurface Petroleum Hydrocarbon Evaluation report and the October 23, 1991 Groundwater Monitoring report. 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
3/18/2010 Document, Report, or Work plan Review - other DEC issues a letter approving Arcadis’ October 29, 2009 “Enhanced Anaerobic Bio-Oxidation Pilot Test Workplan-Revised” for the Former Chevron Station 9-2555, 920 Gambell Street site. The workplan proposes to conduct pilot testing and monitoring of the injection of magnesium sulfate and sodium nitrate solutions at the site to enhance the anaerobic degradation of the remaining contamination. Robert Weimer
4/20/2010 Document, Report, or Work plan Review - other Soil vapor sampling was conducted on multi-level (5, 10.5, and 15 feet below ground surface-bgs)vapor probes VP-1, VP-2, and VP-3 that were installed and sampled on October/November 2009. VP-1 had PCE at 42 ug/m3 (5 feet bgs), 60 ug/m3 (10.5 feet bgs), and 34 ug/m3 (at 15 feet bgs). VP-2 had PCE at 27 ug/m3 (5 feet bgs), 25 ug/m3 (10.5 feet bgs), and 13 ug/m3 (at 15 feet bgs). VP-3 had PCE at 17 ug/m3 (5 feet bgs), 88 ug/m3 (10.5 feet bgs), and 18 ug/m3 (at 15 feet bgs). Two outdoor air samples were also collected one upwind and one downwind which was non-detect (<0.16 ug/m3) PCE. The screening level for PCE is 6.1 ug/m3 for shallow soil gas (5 and 10.5 feet bgs), and 61 ug/m3 for deep soil gas (15 feet bgs). All TCE soil gas samples were non-detect (<0.15 ug/m3). Robert Weimer
4/21/2010 Document, Report, or Work plan Review - other Soil vapor sampling was conducted on multi-level (5, 10.5, and 15 feet below ground surface-bgs)vapor probes VP-1, VP-2, and VP-3 that were installed and sampled on 2/24/2010. VP-1 had PCE at 5 ug/m3 (5 feet bgs), 6 ug/m3 (10.5 feet bgs), and 13 ug/m3 (at 15 feet bgs). VP-2 had PCE at 4.8 ug/m3 (5 feet bgs), 4 ug/m3 (10.5 feet bgs), and 3.4 ug/m3 (at 15 feet bgs). VP-3 had PCE at 3 ug/m3 (5 feet bgs), 11 ug/m3 (10.5 feet bgs), and 2.9 ug/m3 (at 15 feet bgs). Two outdoor air samples were also collected one upwind and one downwind which were <0.16 ug/m3 PCE. The screening level for PCE is 6.1 ug/m3 for shallow soil gas (5 and 10.5 feet bgs), and 61 ug/m3 for deep soil gas (15 feet bgs). VP-3 at 10.5 feet bgs (0.19 ug/m3) was the only detectable TCE soil gas sample. Robert Weimer
5/4/2010 Site Visit Site visit to observe the installation of several injection wells for the pilot testing and monitoring of the injection of magnesium sulfate and sodium nitrate solutions at the site to enhance the anaerobic degradation of the remaining contamination. Robert Weimer
6/2/2010 Offsite Soil or Groundwater Disposal Approved Review and approve thermal treatment of 2 super sack of contaminated drill cuttings. Robert Weimer
7/28/2010 Offsite Soil or Groundwater Disposal Approved Review and approve thermal treatment of 3 drums of contaminated drill cuttings. Robert Weimer
8/24/2010 Document, Report, or Work plan Review - other On September 10, 2008 two borings (MW-23 and MW-24) were sampled and completed as monitoring wells to help define the extent of soil and groundwater contamination at this site. All soil samples met default cleanup levels. Groundwater was encountered at 22.5 feet below ground surface. Robert Weimer
9/14/2010 Offsite Soil or Groundwater Disposal Approved Review and approve thermal treatment of 3 drums of contaminated drill cuttings, and treatment of two drums of contaminated water. Robert Weimer
10/28/2010 Document, Report, or Work plan Review - other May 14/June 7, 2010 groundwater sampling of site monitoring wells. Up to 60 mg/l GRO, 11.0 mg/l DRO, and 390 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 5 of the 16 monitoring wells sampled. Depth to groundwater is 16.31 to 29.96 feet below ground surface. Full extent of DRO groundwater contamination is not currently being monitored, additional monitoring wells will need DRO analysis. Samples were collected using a bladder pump. Robert Weimer
11/8/2010 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of 1 drum of contaminated purge water. Robert Weimer
11/22/2010 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of 1 more drum of contaminated purge water. Robert Weimer
8/16/2011 Document, Report, or Work plan Review - other September 15, 2010 groundwater sampling of site monitoring wells. Up to 55 mg/l GRO, 5.0 mg/l DRO, 1.7 mg/l RRO, non-detect (<1 ug/l) DCA, non-detect (<1 ug/l) EDB, non-detect (<0.5 ug/l)MTBE, 2.3 mg/l 1,2,4-Trimethylbenzene,and 400 ug/l benzene in groundwater. PAH's were less than cleanup levels. Plume that extends off-property to the northwest and appears to be increased in 6 of the 19 monitoring wells sampled. Depth to groundwater is 16.32 to 26.80 feet below ground surface. Full extent of DRO groundwater contamination is not currently being monitored, additional monitoring wells will need DRO analysis. Samples were collected using a blailer this monitoring event. Robert Weimer
10/6/2011 Document, Report, or Work plan Review - other Approved for transport and storage at 1441 C street of 3 drums and supersacks of soil generated during June 2011 subsurface investigation. Robert Weimer
10/25/2011 Update or Other Action DEC received a copy of the completed injection well inventory form for this site. The form notes that the site has 5 class 5 injection wells that are being used for the injection of high concentration of sulfate and nitrate solution for remediation of petroleum impacted groundwater at the site. Robert Weimer
12/6/2011 Document, Report, or Work plan Review - other April 5-11, 2011 groundwater sampling of site monitoring wells. Up to 43 mg/l GRO, 9.6 mg/l DRO, 2.8 mg/l RRO, non-detect (<1 ug/l) DCA, non-detect (<1 ug/l) EDB, non-detect (<1 ug/l) MTBE, 2.0 mg/l 1,2,4-Trimethylbenzene,and 370 ug/l benzene in groundwater. PAH's were less than cleanup levels. Plume that extends off-property to the northwest and appears to be increased in 7 of the 17 monitoring wells sampled. Depth to groundwater is 16.72 to 27.32 feet below ground surface. Full extent of DRO groundwater contamination is not currently being monitored, additional monitoring wells will need DRO analysis. Samples were collected using a blailer this monitoring event. Robert Weimer
2/29/2012 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/28/12. Chevron is to provide the recent vapor monitoring reports and conduct another vapor monitoring report on November of 2012. Semi-annual groundwater monitoring is to continue and another Epsom salt injection is scheduled in 2012. They are to add a rose diagram to the monitoring figure. Robert Weimer
12/6/2012 Document, Report, or Work plan Review - other May 14, 2012 groundwater sampling of site monitoring wells. Up to 61 mg/l GRO, 32 mg/l DRO, non-detect (<3 ug/l) 1,2-DCA, non-detect (<0.0096 ug/l) EDB, and 250 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 12 of the 19 monitoring wells sampled. Depth to groundwater is 16.45 to 26.92 feet below ground surface. Full extent of DRO groundwater contamination is not currently being monitored, additional monitoring wells will need DRO analysis. Samples were collected using a bailer this monitoring event. Robert Weimer
12/19/2012 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of 2 drums of contaminated purge water. Robert Weimer
2/26/2013 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/26/13. Chevron is approved to suspend formaldehyde groundwater analysis, provide missing reports, they are approved to remove the off-property remediation shed, but may need to do other corrective action in the future if the magnesium sulfate injection is not going to effectively address remaining contamination. 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
6/28/2013 Site Visit Site visit to observe current site conditions. Robert Weimer
10/24/2013 Document, Report, or Work plan Review - other September 25-27, 2012 groundwater sampling of site monitoring wells. Up to 50 mg/l GRO, 39 mg/l DRO (12 mg/l after silica gel), non-detect (<0.5 ug/l) 1,2-DCA, non-detect (<0.0097 ug/l) EDB, and 260 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 11 of the 19 monitoring wells sampled. Depth to groundwater is 15.92 to 26.62 feet below ground surface. Full extent of DRO groundwater contamination is not currently being monitored, additional monitoring wells will need DRO analysis. Samples were collected without purging using a bailer this monitoring event so the results of volatile samples may be biased low. Robert Weimer
12/4/2013 Document, Report, or Work plan Review - other Soil vapor sampling was conducted on multi-level (5, 10.5, and 15 feet below ground surface-bgs)vapor probe VP-1 on November 17, 2012. VP-1 had PCE at 4.0 ug/m3 (5 feet bgs), 15 ug/m3 (10.5 feet bgs), and 50 ug/m3 at 15 feet bgs). Sampling of vapor probes VP-2 and VP-3 were not sampled because probe vaults were frozen. VP-3 at 10.5 feet bgs had previously (on 11/2/09) shown soil gas concentration (590 ug/m3) over screening levels for PCE. Two outdoor air samples were also collected one upwind and one downwind which were non-detect (<0.99 ug/m3) PCE. Robert Weimer
2/10/2014 Document, Report, or Work plan Review - other May 22, 2013 groundwater sampling of site monitoring wells. Up to 19.2 mg/l GRO, 7.4 mg/l DRO, and 208 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 4 of the 19 monitoring wells sampled. Depth to groundwater is 15.66 to 25.93 feet below ground surface. Full extent of DRO groundwater contamination is not currently being monitored, additional monitoring wells will need DRO analysis. 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 7 of the wells sampled and the sample depth was not consistent where it was documented, in those it was between 0.92 and 8.84 below groundwater surface. In many monitoring wells the purge/no-purge results were not consistent (for example WPHC-1 had benzene at 6.4 ug/l with no-purge and 121 ug/l with purge). Robert Weimer
2/27/2014 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/27/2014. The on-property and off-property remediation system were not operated in 2013. 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 abandonment of the AS/SVE system. They still need a frozen and non-frozen ground soil gas sampling event to help evaluated the vapor intrusion pathway. They may need to install additional monitoring wells to define the extent of the contamination before cemetery. 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
4/18/2014 Document, Report, or Work plan Review - other September 4, 2013 groundwater sampling of site monitoring wells. Up to 53.2 mg/l GRO, 7.2 mg/l DRO, and 173 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 7 of the 17 monitoring wells sampled. Depth to groundwater is 15.49 to 25.82 feet below ground surface. Full extent of DRO groundwater contamination is not currently being monitored, additional monitoring wells will need DRO analysis. BTEX and GRO samples were collect by no-purge (Hydrasleeve) method, and the DRO with bailers. Because the sampling interval for the hydrasleeve was not documented in the field notes the sample results are considered biased low. Robert Weimer
5/6/2014 Document, Report, or Work plan Review - other DEC approves request to reduce number of monitoring wells to do the purge/no-purge comparison study on during the May 6, 2014 ground water monitoring event. Monitoring wells MW-2R, MW-3R, MW-4, MW-7, and MW-17 are approved to not being included in the comparison study. Robert Weimer
5/6/2014 Site Visit Site visit to observe start of groundwater monitoring. They were beginning depth to water measurements. Robert Weimer
5/7/2014 Site Visit Site visit to observe start of groundwater monitoring. They were collecting groundwater samples from monitoring wells MW-20 and MW-21. They were collecting both no-purge with Hydrasleeve and purge with badder pump. DEC CS QA officer also attended the site visit. It was noted that the meter for the water quality parameters had not been calibrated that day. Reminded consultant that water samples need to be collected as close as possible to the top of the water column. Robert Weimer
11/13/2014 Conceptual Site Model Submitted Conceptual site model identified soil/groundwater soil ingestion/dermal contact and inhalation of indoor/outdoor air pathways. Robert Weimer
1/26/2015 Document, Report, or Work plan Review - other May 6, 2014 groundwater sampling of site monitoring wells. Up to 31.0 mg/l GRO, 3.8 mg/l DRO, and 140 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 3 of the 18 monitoring wells sampled. Depth to groundwater is 15.13 to 25.32 feet below ground surface. Full extent of DRO groundwater contamination is not currently being monitored, additional monitoring wells will need DRO analysis. BTEX and GRO samples were collect by both no-purge (Hydrasleeve) method and purge method (low flow pump). Monitoring wells MW-10 and MW-21 no-purge samples and monitoring well MW-22 purge sample were not collected at the top of the water column as required, so those sample results are considered biased low. In general the purge samples had significantly higher concentrations than the no-purge sample results. MW-6 had GRO 15.7 mg/l (purge) vs. 1.14 mg/l (no purge). DEC to request that all future sampling at this site be by purge method. Robert Weimer
6/25/2015 Document, Report, or Work plan Review - other October 20, 2014 groundwater sampling of site monitoring wells. Up to 16.4 mg/l GRO, 5.3 mg/l DRO, and 113 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 6 of the 18 monitoring wells sampled. Depth to groundwater is 15.19 to 25.20 feet below ground surface. Full extent of DRO groundwater contamination is not currently being monitored, additional monitoring wells will need DRO analysis. BTEX and GRO samples were collect by no-purge (Hydrasleeve) method from the top of the water column as required. DEC to request that all future sampling at this site be by purge method. Robert Weimer
7/2/2015 Update or Other Action DEC approves suspending, until further notice, the analytical sampling of monitoring wells MW-3R, MW-4, MW-7, MW-23, and MW-24. DEC requests that future groundwater monitoring events for this site be conducted by purge method using a low-flow in-well pump or bladder pump with the intake of the pump documented in the field notes and the report to be as close as possible to the soil/water interface (within the top foot) at the time of sampling. Robert Weimer
8/11/2015 Document, Report, or Work plan Review - other Review of Sulfate Injection and Monitoring report. The sulfate source used was magnesium sulfate heptahydrate (Epsom salt). Five injection wells were installed and the initial injection of 17,000 gallons of a 5 g/l of sulfate and 0.1 g/l sodium nitrate solution occurred in June 2010. They estimated a 10 to 15 foot radius of influence for each injection well. A second injection of 45,000 gallons of sulfate solution occurred in April/May of 2011. A third injection of 43,000 gallons of sulfate solution occurred in June 2012. A significant increase in sulfate-reducing bacteria was observed later after the sulfate injections. Robert Weimer
10/8/2015 Document, Report, or Work plan Review - other April 22, 2015 groundwater sampling of site monitoring wells. Up to 16.4 mg/l GRO, 5.3 mg/l DRO, and 113 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 13 of the 18 monitoring wells sampled. Depth to groundwater is 16.20 to 25.58 feet below ground surface. Full extent of DRO groundwater contamination is not currently being monitored, additional monitoring wells will need DRO analysis. BTEX and GRO samples were collect by no-purge (Hydrasleeve) method. 6 of the 18 monitoring wells were not collected from the top of the water column as required or the sample interval was not documented. The results in those wells are considered biased low. DEC requested on July 2, 2015 that all future sampling at this site be by purge method from the top foot of the water column. Robert Weimer
10/29/2015 Site Visit Site visit to observe groundwater monitoring. 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
6/1/2016 Document, Report, or Work plan Review - other October 27-28, 2015 groundwater sampling of site monitoring wells. Up to 45 mg/l GRO, 5.2 mg/l DRO, and 94 ug/l benzene in groundwater. Plume that extends off-property to the northwest and appears to be increased in 8 of the 12 monitoring wells sampled. Depth to groundwater is 15.62 to 25.71 feet below ground surface. Samples were collect by purge (Bladder Pump) method. Monitoring wells were collected from the top of the water column as required. Robert Weimer
8/3/2016 Site Visit Site visit to observe current site conditions. Robert Weimer
11/10/2016 Document, Report, or Work plan Review - other May 23-25, 2016 groundwater sampling of site monitoring wells. Up to 37 mg/l GRO, 7.7 mg/l DRO, and 83 ug/l benzene in groundwater. Plume that extends off-property to the west, north, and northwest and the concentrations have increased in 8 of the 13 monitoring wells sampled. Depth to groundwater is 16.48 to 26.36 feet below ground surface this monitoring event. Samples were collect by purge (Bladder Pump) method. Monitoring wells were collected from the top of the water column as required. Robert Weimer
11/3/2017 Document, Report, or Work plan Review - other October 10-12, 2016 groundwater sampling of site monitoring wells. Up to 32 mg/l GRO, 6.6 mg/l DRO, and 98 ug/l benzene in groundwater. Plume that extends off-property to the west, north, and northwest and the concentrations have increased in 9 of the 13 monitoring wells sampled. Groundwater flow direct was to the northwest this monitoring event. Depth to groundwater is 16.17 to 26.31 feet below ground surface this monitoring event. Samples were collect by purge (Bladder Pump) method. Monitoring wells were collected from the top of the water column as required. Robert Weimer
1/12/2018 Document, Report, or Work plan Review - other April 27-28, 2017 groundwater sampling of site monitoring wells. Up to 29 mg/l GRO, 5.9 mg/l DRO, and 83 ug/l benzene in groundwater. Plume that extends off-property to the west, north, and northwest and the concentrations have increased in 3 of the 13 monitoring wells sampled. Groundwater flow direct was to the northwest this monitoring event. Depth to groundwater is 16.23 to 26.49 feet below ground surface this monitoring event. Samples were collect by purge (Bladder Pump) method. Monitoring wells were collected from the top of the water column as required except in monitoring well MW-21 which had the pump intake 2.6 feet above the water. Robert Weimer
1/12/2018 Update or Other Action DEC approves reduction of groundwater sampling of monitoring well MW-20 and MW-21 from semi-annual to annual. Robert Weimer
1/22/2018 Document, Report, or Work plan Review - other September 27-28, 2017 groundwater sampling of site monitoring wells. Up to 36 mg/l GRO, 4.8 mg/l DRO, and 51 ug/l benzene in groundwater. Plume that extends off-property to the west and northwest and the concentrations have increased in 5 of the 12 monitoring wells sampled. Groundwater flow direct was to the northwest this monitoring event. Depth to groundwater is 15.96 to 26.28 feet below ground surface this monitoring event. Samples were collect by purge (Bladder Pump) method. Monitoring wells were collected from the top of the water column as required except in monitoring well MW-21 which had the pump intake 2.6 feet above the water. Robert Weimer
8/24/2018 Document, Report, or Work plan Review - other April 25-26, 2018 groundwater sampling of site monitoring wells. Up to 37 mg/l GRO, 5.5 mg/l DRO, and 69 ug/l benzene in groundwater. Plume that extends off-property to the west and northwest and the concentrations have increased in 7 of the 12 monitoring wells sampled. Groundwater flow direct was to the northwest this monitoring event. Depth to groundwater is 16.18 to 26.50 feet below ground surface this monitoring event. Samples were collect by purge (Bladder Pump) method. Monitoring wells were collected from the top of the water column as required. Robert Weimer
1/17/2019 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78039 1990 UST Contamination. Robert Weimer
5/13/2019 Document, Report, or Work plan Review - other August 30-31, 2018 groundwater sampling of site monitoring wells. Up to 40 mg/l GRO, 8.0 mg/l DRO, and 78 ug/l benzene in groundwater. Plume that extends off-property to the west and northwest and the concentrations have increased in 7 of the 11 monitoring wells sampled. Groundwater flow direct was to the northwest this monitoring event. Depth to groundwater is 16.37 to 26.64 feet below ground surface this monitoring event. Samples were collect by purge (Bladder Pump) method. Monitoring wells were collected from the top of the water column as required. Samples were not analyzed for PAH or full VOCs. 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-2R, MW-12, and MW-17. ADEC is also requesting that all of the monitoring wells to be sampled be sampled for PAHs the next two monitoring events. Based on the results of the PAH sampling additional PAH sampling events may be required beyond the next two events. Robert Weimer
9/24/2019 Site Visit Site visit to observe current site conditions. Robert Weimer
12/13/2019 Document, Report, or Work plan Review - other April 29, 2019 groundwater sampling of site monitoring wells. Up to 29 mg/l GRO, 5.5 mg/l DRO, 1.4 mg/l ethylbenzene, 7.6 mg/l total xylenes, and 95 ug/l benzene in groundwater. Plume that extends off-property to the northwest and west and the concentrations have increased in 5 of the 10 monitoring wells sampled. Groundwater flow direct was to the northwest this monitoring event. Depth to groundwater is 16.56 to 26.75 feet below ground surface this monitoring event. Samples were collect by purge (Bladder Pump) method. Monitoring wells were not collected from the top foot of the water column (they were collected about 2 feet below the surface of the groundwater) as required, so the results may be biased low. Robert Weimer
12/16/2019 Update or Other Action ADEC request that for all future monitoring events for all of the Chevron sites that the field notes document the measurement of the pump intake is within the top foot of the water column at the time of the sampling. 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
6/15/2020 Long Term Monitoring Workplan or Report Review 2019 Second Semi-Annual Groundwater Monitoring event was conducted on September 30 and October 1, 2019. Groundwater samples were collected from monitoring wells MW-2R, MW-6, MW-8 through MW-12, MW-14, MW-20 through MW-22 and WPHC-1 and analyzed for GRO, DRO, and BTEX. Monitoring well MW-17 was inaccessible. Groundwater flow direction was to the northwest and depth to groundwater was 116.60 to 26.68 feet below ground surface. Rebekah Reams
6/15/2020 Long Term Monitoring Workplan or Report Review 2020 First Semi-Annual Groundwater Monitoring event was conducted on April 16th, 2020. Groundwater samples were collected from monitoring wells MW-9, MW-10, MW-11, MW-14 and MW-22 and analyzed for GRO, DRO, VOCs, and PAHs. Monitoring wells MW-2R, MW-3R, MW-4, MW-6, MW-7, MW-8 and WPHC-1 were inaccessible. Groundwater flow direction was to the north-northwest and depth to groundwater was 17.63 to 26.58 feet below ground surface. Rebekah Reams
12/31/2020 Long Term Monitoring Workplan or Report Review 2020 Second Semi-Annual Groundwater Monitoring event was conducted on October 27th, 2020. Groundwater samples were collected from monitoring wells MW-6, MW-8 through MW-11, MW-14, MW-20, MW-21, MW-22 and WPHC-1 and analyzed for GRO, DRO, VOCs, and PAHs. Monitoring well MW-15 contained insufficient water to sample. The well cap for monitoring well MW-17 was stuck and unable to be opened. Groundwater flow direction was to the northwest and depth to groundwater was 16.50 to 26.27 feet below ground surface. Rebekah Reams
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
10/1/2021 Long Term Monitoring Workplan or Report Review During the 2021 First Semi-Annual Groundwater Monitoring event groundwater samples were collected from monitoring wells MW-9, MW-10, MW-11, MW-14, MW-15 and MW-22 on April 21 and 22, 2021. Groundwater samples were collected from monitoring well WPHC-1 on May 12 and MW-6 and MW-8 on May 26, 2021. Well MW-13 and WPHC-1 were frozen at 1 foot below top of casing, the well vault for monitoring well MW-17 was unable to be opened, the well vault lid missing for MW-21 and vehicle parked over well MW-24. Samples were submitted to the laboratory for GRO, DRO, and VOCs analysis. The following analytes exceeded cleanup levels up to concentrations of GRO (14.6 mg/L), DRO (5.96 mg/L), benzene (0.0425 mg/L), ethylbenzene (0.909 mg/L), total xylenes (5.93 mg/L), naphthalene (0.254 mg/L), 1,2,4-trimethylbenzene (1.5 mg/L), 1,3,5-trimethylbenzene (0.28 mg/L), EDB (0.00025 mg/L), 1-methylnaphthalene (0.0205 mg/L), and 2-methylnapthalene (0.0466 mg/L) exceeded groundwater cleanup levels during this sampling event. Groundwater flow direction was to the northwest and depth to groundwater was 16.47 to 26.55 feet below ground surface. Rebekah Reams
1/26/2022 Long Term Monitoring Workplan or Report Review 2021 Second Semi-Annual Groundwater Monitoring event was conducted on September 21, 2021. Groundwater samples were collected from monitoring wells MW-6, MW-8, MW-9, MW-10, MW-11, MW-14, MW-15, MW-20, MW-21, MW-22, and WPHC-1 and analyzed for GRO, DRO, and VOCs. The well cap for monitoring well MW-17 was stuck and unable to be opened. Groundwater flow direction was to the north-northwest and depth to groundwater was 16.49 to 26.50 feet below ground surface. Rebekah Reams
8/12/2022 Long Term Monitoring Workplan or Report Review 2022 First Semi-Annual Groundwater Monitoring event was conducted on May 11, 2022. Groundwater samples were collected from monitoring wells MW-6, MW-8, MW-9, MW-10, MW-11, MW-14, MW-22, and WPHC-1 and analyzed for GRO, DRO, and VOCs. The well vault for monitoring well MW-17 was stuck and unable to be opened and MW-20 and MW-21 were inaccessible and could not be sampled. Groundwater flow direction was to the northwest and depth to groundwater was 16.16 to 26.53 feet below ground surface. 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
12/23/2022 Offsite Soil or Groundwater Disposal Approved DEC approved transport of one 55-gallon drum of purge water for offsite disposal Rebekah Reams
9/14/2023 Long Term Monitoring Workplan or Report Review 2022 Second Semi-Annual Groundwater Monitoring event was conducted on September 1, 2022. Groundwater samples were collected from monitoring wells MW-9, MW-10, MW-11, MW-14, MW-15, MW-20, MW-21, MW-22, and WPHC-1 and analyzed for GRO, DRO, VOCs, and PAHs. Monitoring wells MW-6 and MW-8 were inaccessible and could not be sampled. The well vault for monitoring well MW-17 was unable to be accessed. Wells MW-2R, MW-3R, MW-4, MW-6, MW-7, and MW-8 were not gauged due to a locked gate. Groundwater flow direction was to the northwest and depth to groundwater was 18.23 to 26.22 feet below ground surface. Rebekah Reams
9/14/2023 Long Term Monitoring Workplan or Report Review 2023 First Semi-Annual Groundwater Monitoring event was conducted on May 9, 2023. Groundwater samples were collected from monitoring wells MW-6, MW-8, MW-9, MW-10, MW-11, MW-14, MW-15, MW-20, MW-21, MW-22, and WPHC-1 and analyzed for GRO, DRO, and VOCs. The well vault for monitoring well MW-17 was unable to be accessed. Groundwater flow direction was to the north-northwest and depth to groundwater was 15.20 to 25.60 feet below ground surface. Rebekah Reams
10/26/2023 Long Term Monitoring Workplan or Report Review ADEC approved the Groundwater Analyte Adjustment Request which proposes to update the wells included in the sample plan and revise the analyte list based on an evaluation of recent analytical results, and to add lead to the sampling plan in order to assess whether it is a contaminant of concern at the site. Rebekah Reams
10/26/2023 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 78039 1990 UST Contamination. Rebekah Reams
11/3/2023 Long Term Monitoring Workplan or Report Review 2023 Second Semi-Annual Groundwater Monitoring event was conducted on August 24, 2023. Groundwater samples were collected from monitoring wells MW-6, MW-8, MW-9, MW-10, MW-11, MW-14, MW-15, MW-22, and WPHC-1 and analyzed for GRO, DRO, and VOCs. Monitoring well MW-17 was unable to be accessed. Groundwater flow direction was to the northwest and depth to groundwater was 14.96 to 25.25 feet below ground surface. Rebekah Reams
11/30/2023 Site Visit ADEC staff visited the site to observe current site use, layout, and monitoring well locations. 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
9/27/2024 Long Term Monitoring Workplan or Report Review 2024 First Semi-Annual Groundwater Monitoring event was conducted on May 9 and 10, 2024. Groundwater samples were collected from monitoring wells MW-6, MW-9, MW-10, MW-11, MW-12, MW-14, MW-15, MW-22, and WPHC-1 and analyzed for GRO, DRO, PAHs, select VOCs and lead. Monitoring well MW-17 was damaged and could not be sampled. Groundwater flow direction was to the northwest and depth to groundwater was 14.33 to 24.67 feet below ground surface. Rebekah Reams
10/8/2024 Long Term Monitoring Workplan or Report Review 2024 Second Semi-Annual Groundwater Monitoring event was conducted on August 6, 2024. Groundwater samples were collected from monitoring wells MW-6, MW-9, MW-10, MW-11, MW-12, MW-14, MW-15, MW-22, and WPHC-1 and analyzed for GRO, DRO, PAHs, select VOCs and lead. Monitoring well MW-17 was damaged and could not be sampled. Groundwater flow direction was to the west-northwest and depth to groundwater was 14.61 to 24.41 feet below ground surface. Rebekah Reams
10/17/2024 Offsite Soil or Groundwater Disposal Approved ADEC approved transport of 55 gallons of purge water generated during 2024 groundwater monitoring events Rebekah Reams

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Hazard ID Site Name File Number
26240 Fairview Areawide Brownfield Assessment 2100.57.020

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