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Site Report: Former Chevron - #7324

Site Name: Former Chevron - #7324
Address: 4417 Lake Otis Pkwy. , Anchorage, AK 99507
File Number: 2100.26.008
Hazard ID: 23885
Status: Active
Staff: Rebekah Reams, 9074512144 rebekah.reams@alaska.gov
Latitude: 61.180533
Longitude: -149.837346
Horizontal Datum:WGS84

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

Waste oil tank failed tightness test and was removed in 1992. Some contaminated soil removed, but some could not because it was under building foundation at the time. Later gasoline tanks were removed and gasoline contamination was encountered. Remaining soil and ground water contamination being remediated and monitored. Contamination extends off property to the south and east and near the road to the north. Drinking water wells in the area were sampled. Property has been sold to Municipality of Anchorage for road widening project. Several of the monitoring wells have been abandoned, the tanks and piping have been removed (May 2004) and station building is to be removed in 2005. Additional gasoline contamination found during tank and piping removal in May 2004. In 2004 450 cubic yards of contaminated soil was removed and thermally treated. In 2005 additional contaminated soil was removed and treated. Up to 1.1 mg/kg benzene, 9.9 mg/kg toluene, and 0.038 mg/kg tetrachloroethene remain. In 2010 contamination was found at two areas in the northwest portion and northern edge of the property. 30 cubic yards of contaminated soil was excavated during ACS utility work, and later in 2010 stained soils were found under the former asphalt layer on the northwest portion of the property where 10 cubic yards of visibly stained soils with a fuel odor and field readings up to 410 ppm were excavated. The extent of the contamination in these areas has not been fully defined. In 2011 an air sparge/soil vapor extraction (AS/SVE) system was installed and has been operated in the summer since then.

Action Information

Action Date Action Description DEC Staff
9/26/1990 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77944 Gasoline and used oil contamination found during facility upgrade. Former Staff
9/26/1990 Site Added to Database Former Staff
9/27/1990 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Former Staff
10/12/1990 Underground Storage Tank Site Characterization or Assessment Hart Crowser sent in soil sample results which showed total petroleum hydrocarbons as high as 126,000 mg/kg. Also present in soil were tetrachloroethylene at 3.02 mg/kg and 1, 1, 1 dichloroethane at 1.12 mg/kg. Former Staff
11/13/1990 Release Investigation Hart Crowser sent workplan for ADEC approval. Approval granted 11/14/90 contingent on 3 day notification prior to excavation from service bay and monitoring wells, special containment of excavated soils from service bay needs to be considered due to high leaching ability of these soils. Former Staff
11/23/1990 Document, Report, or Work plan Review - other HartCrowser conducted water well search within 1/4 mi. of site. 13 drinking water wells recorded within area, wells 5 and 11 known to be active and wells 2 and 7 are presumed to be active. 9 other wells presumed to be inactive or connected to municipal services. Former Staff
1/2/1991 Document, Report, or Work plan Review - other MS; HartCrowser sends in lab results from soil sampling of excavation. Total petroleum hydrocarbons method 418.1 126,000 mg/kg. S-2, east wall excavation floor at north end had 8,600 mg/kg and S-1 had 1,460 mg/kg TPH. Former Staff
1/7/1991 Document, Report, or Work plan Review - other Hart Crowser sent report of work performed to date with regard to interior cleanup/monitoring well installations at site. Most elevated levels of TPH, HVO, EPH & BTEX were present in soils beneath the service station building footings along the east & north walls. Soils couldn't be removed without risk to integrity of foundation. Former Staff
3/13/1991 Document, Report, or Work plan Review - other Report from Chevron with receipts for removing and transporting contaminated soil to AK Pollution Control for thermal treatment. Former Staff
6/3/1991 Document, Report, or Work plan Review - other Hart Crowser sent in sampling results from Peacock Cleaner, Tyonek Native Corp., Tudor Motel, Tudor Texaco drinking water wells. Everyone was non detectable for all parameters tested for except Peacock Cleaners which had 6.5 Ug/L of tetrachloroethene (EPA 524.2) Former Staff
4/23/1993 Document, Report, or Work plan Review - other Soil vapor extraction/bioventing system started up 1/8/93, 118# of hydrocarbons removed in the first 21 days. Chevron attempted start up of groundwater treatment system, but had operational difficulties. 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 between ADEC and Chevron to discuss site progress at Alaska Chevron sites and set goals for 2001. Linda Nuechterlein
2/26/2001 Update or Other Action Reviewed Waste Oil Removal Report dated 9/15/00 and sent letter. Linda Nuechterlein
4/20/2001 Document, Report, or Work plan Review - other ADEC sent letter to Chevron approving installation of 3 monitoring wells. Stipulated that soil and GW be tested for VOCs, BTEX and GRO. Linda Nuechterlein
5/20/2004 Document, Report, or Work plan Review - other Reviewed and approved monitoring well decommissioning for station removal, replacement wells will be installed after construction completed. Robert Weimer
5/27/2004 Document, Report, or Work plan Review - other Approved treatment at ASR of 300 cubic yards of BTEX, GRO, DRO contaminated soil. Robert Weimer
6/1/2004 Document, Report, or Work plan Review - other June 1, 2004 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Remaining monitoring wells have up to 29 ug/l PCE. The plume appears to be stable or shrinking. Robert Weimer
11/23/2004 Document, Report, or Work plan Review - other September 22, 2004 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Remaining monitoring wells have up to 54 ug/l PCE and 21 ug/l TCE. The plume appears to be stable or shrinking. Robert Weimer
2/3/2005 Document, Report, or Work plan Review - other Reviewed the November 23, 2004 Facilities Removal report. The report documents the removal of 3 gasoline USTs and their associated piping. There was a piping spill during the removal, but no confirmation sample was taken to confirm the cleanup of the spill. Soil samples were collected at each dispenser, piping joints, and below the tanks. 450 cubic yards of contaminated soil was removed and subsequently thermally treated at ASR. In the areas assessed up to 20,000 mg/kg GRO, 620 mg/kg benzene, and 290 mg/kg DRO was found in the soil. The highest gasoline contamination results were found near the southwest dispenser island. The extent of this contamination has not yet been determined. Robert Weimer
2/23/2005 Meeting or Teleconference Held Meeting with RP's new consultant to discuss site. Need corrective action plan for remaining gasoline contamination found in 2004 and for old used oil contamination under building to be demolished. Also need replacement monitoring wells after road work completed. They may suspend sampling of monitoring wells MW 17 & 18. Need to continue to sample monitoring wells MW 9, 15, and 16 for BTEX and VOCs. Robert Weimer
3/9/2005 Document, Report, or Work plan Review - other ADEC approved the following reduction in groundwater monitoring at the site: Suspend MW-17and MW-18, reduce MW-9 to BTEX/VOC, MW-15 to BTEX/VOC, and MW-16 to BTEX/VOC. Robert Weimer
7/6/2005 Document, Report, or Work plan Review - other May 12, 2005 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Remaining monitoring wells have up to 40 ug/l PCE and 15 ug/l TCE. The plume appears to be stable or shrinking. Robert Weimer
9/12/2005 Meeting or Teleconference Held Meeting with RP's consultant to discuss excavation of remaining contamination in the next week or so after building demolition. Robert Weimer
9/19/2005 Offsite Soil or Groundwater Disposal Approved Approved corrective action plan to thermally treat at ASR the gasoline contaminated soil to be excavated after building demolition. Robert Weimer
10/12/2005 Offsite Soil or Groundwater Disposal Approved Approved thermal treatment of 125 cubic yards of HVOC/RRO contaminated soil from below the former service station building. Also approved 50 cubic yards of soil that meets default cleanup levels to be used as backfill. Robert Weimer
11/15/2005 Document, Report, or Work plan Review - other September 19, 2005 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Remaining monitoring wells have up to 130 ug/l PCE and 24 ug/l TCE. The contaminant concentrations are increasing. Groundwater is 13 to 15 feet below ground surface in the monitoring wells sampled. Groundwater flow direction is to the southwest. The Peacock Cleaners and Tudor Motel drinking water wells were sampled and were non-detect. Robert Weimer
1/25/2006 Document, Report, or Work plan Review - other September 2005 corrective action and release investigation work. 148 tons of contaminated soil removed from the former dispenser and piping areas. 185 tons of contaminated soil was removed from beneath the former service station building. Up to 1.1 mg/kg benzene, 9.9 mg/kg toluene, and 0.038 mg/kg tetrachloroethene remain. Consultant recommends excavating the remaining contamination. Robert Weimer
3/1/2006 Update or Other Action The Municipality of Anchorage (who owns the property now) is doing a Phase 1 report on the adjacent Peacock Cleaners, which may be contributing to the solvent contamination in the groundwater. Robert Weimer
4/5/2006 Meeting or Teleconference Held Meeting regarding the proposed road work at Lake Otis and Tudor in 2008+. based on available sampling data we expect minimal impact from this site on the road project. Robert Weimer
5/11/2006 Meeting or Teleconference Held Meeting with RP and their consultant to discuss future site work. They will submit a work plan to excavate the remaining soil contamination. We will look at past water data and new soil data to determine the number and locations of the replacement monitoring wells. Robert Weimer
7/18/2006 Document, Report, or Work plan Review - other May 8, 2006 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Remaining monitoring wells have up to 300 ug/l PCE and 42 ug/l TCE. The contaminant concentrations are increasing. Groundwater is 13 to 15 feet below ground surface in the monitoring wells sampled. Groundwater flow direction is to the southeast. The Peacock Cleaners drinking water well was abandoned on September 2005. The Tudor Motel drinking water well were sampled and only detected Toluene at 0.1 ug/l (the drinking water standard is 1000 ug/l). Robert Weimer
9/8/2006 Document, Report, or Work plan Review - other ADEC letter conditionally approving confirmation sampling workplan. Conditionally approved plan calls for installing 3 replacement monitoring wells, 2 soil borings, and collecting confirmation soil and groundwater samples. Robert Weimer
10/4/2006 Offsite Soil or Groundwater Disposal Approved ADEC approves thermal treatment of 28 cubic yards of BTEX contaminated soil that was excavated this summer at the site. Robert Weimer
10/16/2006 Offsite Soil or Groundwater Disposal Approved ADEC reviews recent solvent sample results for the 28 cubic yard stockpile. Both samples were non-detect for solvents. ADEC approves thermal treatment of 28 cubic yards of BTEX contaminated soil that was excavated this summer at the site. Robert Weimer
11/1/2006 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
2/6/2007 Document, Report, or Work plan Review - other September 24, 2006 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Up to 360 ug/l benzene, 49 mg/l GRO, 8.3 mg/l DRO, 360 ug/l PCE and 68 ug/l TCE. The contaminant concentrations are increasing. Groundwater is 12 to 23 feet below ground surface in the monitoring wells sampled. Groundwater flow direction is to the east by northeast. The Peacock Cleaners drinking water well was abandoned on September 2005. The Tudor Motel drinking water well was sampled and was non-detect. Robert Weimer
4/2/2007 Meeting or Teleconference Held Meeting with RP to discuss site. Contamination remains at the site. Groundwater monitoring to continue at this site. Robert Weimer
5/14/2007 Document, Report, or Work plan Review - other May 17, 2007 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Up to 500 ug/l benzene, 49 mg/l GRO, and 4.9 mg/l DRO. The contaminant concentrations are increasing in some monitoring wells. Groundwater is 13.27 to 24.24 feet below ground surface in the monitoring wells sampled. Groundwater flow direction historically is to the east by northeast. The Peacock Cleaners drinking water well was abandoned on September 2005. Robert Weimer
6/21/2007 Meeting or Teleconference Held Meeting with RP's consultant to discuss future site work. They will submit a corrective action plan for the active treatment of the groundwater. They will continue to monitor the groundwater at the site. There may need to be additional monitoring wells installed to define the extent of the groundwater contamination. Future confirmation soil sampling will be required for VOCs and BTEX. Robert Weimer
7/23/2007 Document, Report, or Work plan Review - other ADEC approves corrective action plan that calls for injecting oxygen every 2 weeks into monitoring wells MW-1R, MW-2R, and MW-8R. Robert Weimer
8/3/2007 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
9/21/2007 Document, Report, or Work plan Review - other September 21, 2007 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Up to 200 ug/l benzene, 57 mg/l GRO, and 4.9 mg/l DRO. The contaminant concentrations are increasing in some monitoring wells. Groundwater is 11.77 to 23.61 feet below ground surface in the monitoring wells sampled. Groundwater flow direction historically is to the east by northeast. The Peacock Cleaners drinking water well was abandoned on September 2005. The Tudor Motel drinking water well was sampled and was non-detect. Robert Weimer
12/18/2007 Conceptual Site Model Submitted Reviewed Conceptual Site Model Robert Weimer
3/21/2008 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
3/28/2008 Meeting or Teleconference Held Meeting with RP's consultant to discuss future work at this site. They are to check with the Municipality of Anchorage to see if they will be doing the stockpile sampling during the Lake Otis and Tudor road work project. They will also coordinate with the muni on future site improvements and possible treatment system to address remaining contamination. Robert Weimer
5/1/2008 Document, Report, or Work plan Review - other ADEC approves Lake Otis and Tudor intersection improvements corrective action plan. The plan calls for storing and assessing any soils excavated near the site as part of the intersection improvements. Soils meeting default cleanup levels can be reused, soil exceeding default cleanup levels will require treatment. Robert Weimer
8/4/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
2/25/2009 Meeting or Teleconference Held Meeting with RP's consultant to discuss future site work. They will conduct a pilot test/feasibility study prior to submitting a corrective action plan for the remaining soil and groundwater contamination. They will continue to monitor the groundwater at the site. There may need to be additional monitoring wells installed to define the extent of the groundwater contamination. Future confirmation soil sampling will be required for VOCs and BTEX. Robert Weimer
3/5/2009 Document, Report, or Work plan Review - other May 11, 2008 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Up to 430 ug/l benzene, 53.2 mg/l GRO, 7.51 mg/l DRO, 270 ug/l PCE, 50 ug/l TCE, 119 ug/l DCE, and 56.8 ug/l 1,2-DCA. The contaminant concentrations are increasing in some monitoring wells. Groundwater is 11.9 to 24.38 feet below ground surface in the monitoring wells sampled. Groundwater flow direction is historically to the east by northeast. The Peacock Cleaners drinking water well was abandoned on September 2005. The Tudor Motel drinking water well was sampled and was non-detect. Robert Weimer
4/27/2009 Offsite Soil or Groundwater Disposal Approved ADEC approves request to transport one drum of monitoring well purge water to 1441 C Street for secure storage. Robert Weimer
5/5/2009 Document, Report, or Work plan Review - other July 15, 2008 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Monitoring wells MW-16 and MW-17 were not accessible. Up to 320 ug/l benzene, 65 mg/l GRO, 6.4 mg/l DRO, 210 ug/l PCE, 43 ug/l TCE, 102 ug/l DCE, and 37 ug/l 1,2-DCA. The contaminant concentrations are increasing in some monitoring wells. Groundwater is 15.27 to 24.23 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the northeast. The Peacock Cleaners drinking water well was abandoned on September 2005. The Tudor Motel drinking water well was sampled and was non-detect. Robert Weimer
6/18/2009 Offsite Soil or Groundwater Disposal Approved ADEC approves request for treatment of one drum of monitoring well purge water. Robert Weimer
6/29/2009 Document, Report, or Work plan Review - other On November 26, 2008 a Phase 2 assessment was conducted at the former Tudor Motel property to assess for contamination from the adjacent former Chevron Gas Station property. Four analytical soil samples were collected near the property line. Up to 1.3 mg/kg GRO, 4.09 mg/kg DRO, non-detect (<0.0269 mg/kg) PCE (0.024 mg/kg cleanup level), and 0.0322 mg/kg TCE (0.02 mg/kg cleanup level). Robert Weimer
8/11/2009 Document, Report, or Work plan Review - other Approved request for storing purge water and drums of soil cutting at the secured area at 1441 C Street. Robert Weimer
10/20/2009 Document, Report, or Work plan Review - other May 14, 2009 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Monitoring wells MW-16 and MW-17 were not accessible. Up to 140 ug/l benzene, 51 mg/l GRO, 5 mg/l DRO, 97 ug/l PCE, 25 ug/l TCE, 64 ug/l DCE, and 27 ug/l 1,2-DCA. The contaminant concentrations are increasing in 2 of the 4 monitoring wells sampled. Groundwater is 16.37 to 24.34 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the south. The Peacock Cleaners drinking water well was abandoned on September 2005. The Tudor Motel drinking water well has also been abandoned. Robert Weimer
12/2/2009 Document, Report, or Work plan Review - other ADEC approves workplan for conducting an air sparge/soil vapor extraction pilot test. Robert Weimer
1/28/2010 Document, Report, or Work plan Review - other August 26, 2009 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Monitoring wells MW-16 and MW-17 were not accessible, they are inside a fenced area of the Peacock site. Up to 230 ug/l benzene, 53 mg/l GRO, 4.9 mg/l DRO, 200 ug/l PCE, 36 ug/l TCE, non-detect (<4.0 ug/l) DCE, 23 ug/l methylene Chloride, and 56 ug/l 1,2-DCA. The contaminant concentrations are increasing in 2 of the 4 monitoring wells sampled. Groundwater is 15.61 to 24.61 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the north east. The Peacock Cleaners drinking water well was abandoned on September 2005. The Tudor Motel drinking water well has also been abandoned. Robert Weimer
3/11/2010 Meeting or Teleconference Held Meeting with Chevron and their consultants on 3/10/10. MW1R & MW8R are to be sampled for PAH the next monitoring event. We discussed that the proposed road work has expanded into one of the remaining contaminated areas (MW8R) so Chevron will look at excavating all of contaminated soil in that area. 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
4/9/2010 Document, Report, or Work plan Review - other DEC review of Site Vapor Intrusion Evaluation report for this site. The report concluded that this site does not have a potential for vapor intrusion based on structures currently being more than 30 feet away from the remaining soil and groundwater contamination at this site. The vapor intrustion evaluation may need to be updated based on future structures that could be constructed at or near the site. Robert Weimer
4/13/2010 Update or Other Action No purge sampling approved for this site. During the April 2010 groundwater monitoring event HydraSleeve(TM) samplers will be used for VOC sampling at this site. Robert Weimer
4/19/2010 Document, Report, or Work plan Review - other DEC reviews and approves request to properly abandon monitoring well MW-8R is approved under the condition that it is sampled for BTEX, GRO, DRO, PAH, and HVOCs prior to well abandonment. Monitoring well MW-8R is in an area of the site where road work expansion is to occur in 2010. Robert Weimer
4/20/2010 Site Visit Site visit to observe updated groundwater monitoring technique. Robert Weimer
5/28/2010 Update or Other Action Received notification from the road project consultant that 30 cubic yards of contaminated soil was excavated during ACS utility work installing conduit sleeves at 6 feet below ground surface across Tudor Road. The contaminated soil was place in a lined cell on a nearby property. Soils have elevated field readings and a faint odor. Robert Weimer
6/14/2010 Site Visit Site visit to observe groundwater sample collection using hydra sleeve bags. Nicholas Greco and Eric Purcell from CRA collected samples while Brent Porter from the ADEC obeserved. Brenton Porter
6/14/2010 Update or Other Action On 6/14/10 stained soils were found under the former asphalt layer on the north side of the property. 10 cubic yards of visibly stained soils were excavated and in the lined stockpile area. The soils had a fuel odor and field readings up to 410 ppm. Robert Weimer
7/2/2010 Offsite Soil or Groundwater Disposal Approved ADEC approves request for thermal treatment of three drums of contaminated drill cuttings. Robert Weimer
8/23/2010 Meeting or Teleconference Held Called Chevron's consultant CRA regarding the 40 cubic yards of contaminated soil generated during utility work on the site. The soil is currently stored in a lined covered stockpile located on the adjacent property to the east. DEC requests the results of the soil sampling, chromatograms, sample report/field notes for the sampling of the stockpile conducted by the Muni's consultant. Supplemental sampling may be required based on results. CRA was going to check out the stockpile when they do their groundwater monitoring at the site on September 6, 2010. Robert Weimer
9/24/2010 Update or Other Action Contacted landowners consultant (Tellus) regarding the sampling conducted on the 40 cubic yards of contaminated soil generated during work on the Chevron property. Of that pile 30 cubic yards was generated on 5/28/10 and 10 more cubic yards were added in 6/14/10 from another nearby contaminated area on the Chevron property. Tellus will send over the analytical results and QA/QC checklist for the 5/28/10 sampling of the 30 cubic yards and any photos he might have of where the 10 cubic yards soils were placed with the 30 cubic yard soils. He confirmed that there were no analytical samples collected from the 10 cubic yards of contaminated soil generated on 6/14/10 that was placed with/on the 30 cubic yard stockpile and that the 10 cubic yard soils had much higher field readings (up to 313 ppm) in its excavation as compared to the 30 cy soils (up to 5.2 ppm). Robert Weimer
9/28/2010 Update or Other Action Discussed with Chevron's consultant that there were no analytical samples collected from the 10 cubic yards of contaminated soil generated on 6/14/10 that was placed with/on the 30 cubic yard stockpile and that the 10 cubic yard soils had much higher field readings (up to 313 ppm) in its excavation as compared to the 30 cy soils (up to 5.2 ppm). The will provide a plan to sample the whole stockpile to either characterize it for thermal treatment (just need PCB, metals, solvents), or to demonstrate it meets default cleanup levels (test for as an unknown). Robert Weimer
9/28/2010 Document, Report, or Work plan Review - other Received the analytical results and QA/QC checklist for the 5/28/10 sampling of the 30 cubic yards of soil. Three samples were collected and they were analyzed for BTEX/GRO/DRO/Solvents. All three samples meet default cleanup levels. The 10 cubic yards of contaminated soil generated on 6/14/10 that was placed with/on the 30 cubic yard stockpile was not sampled and the 10 cubic yard soils had much higher field readings (up to 313 ppm) in its excavation as compared to the 30 cy soils (up to 5.2 ppm). Robert Weimer
10/1/2010 Document, Report, or Work plan Review - other Approve sampling plan for the 40 cubic yard stockpile. The plan proposes collecting one analytical at the highest of 5 field screening locations. The sample is to be analyzed for HVOCs by method 8260B/C, metals by method 6020A, and PCBs by method 8082A. Robert Weimer
10/5/2010 Offsite Soil or Groundwater Disposal Approved ADEC approves request for treatment of one drum of monitoring well purge water. Robert Weimer
10/11/2010 Site Visit Site visit to observe stockpile sampling and current site conditions. Robert Weimer
10/22/2010 Site Visit Site visit to observe current site conditions and to take measurements. Robert Weimer
10/26/2010 Meeting or Teleconference Held Meeting with Chevron, their consultant CRA, and the property owner Municipality of Anchorage (MOA) to discuss future site work. The stockpile sample results are to be received and submitted soon. Chevron proposes to install in the spring of 2011 a soil vapor extraction (SVE) and air sparge (AS) system to address the remaining soil and groundwater contamination at the site. The system piping will be above ground and the wells 3" size, the site will be fenced, and the system operated during the non winter months. They hope to have the site cleaned up by the Fall of 2012, when they would collect confirmation soil samples. They plan to install a replacement monitoring well close to former monitoring well MW-8R. They will provide a corrective action plan for the system and a release investigation workplan for the contamination identified on the north side of the property in 2010. The MOA is to provide as-builts soon that will show site improvements and utilities. Chevron will discuss with MOA about who will be responsible to address the PCE and TCE contamination to the southeast of the Chevron. Robert Weimer
11/3/2010 Offsite Soil or Groundwater Disposal Approved DEC approves transport and disposal at a permitted landfill in Oregon of the 40 cubic yards of contaminated soil generated during site utility work in 2010. The soils contained some PCBs. Robert Weimer
1/7/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77944 1990 site contamination based on current conditions. Robert Weimer
3/24/2011 Site Characterization Report Approved June 15, 2010 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Monitoring wells MW-16 and MW-17 were not accessible, they are inside a fenced area of the Peacock site. Up to 130 ug/l benzene, 43 mg/l GRO, 6.7 mg/l DRO, 280 ug/l PCE, 44 ug/l TCE, 130.0 ug/l DCE, non-detect (<2 ug/l) methylene Chloride, and 17 ug/l 1,2-DCA. The contaminant concentrations are increasing in 2 of the 4 monitoring wells sampled. Groundwater is 15.60 to 24.29 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the northeast. The Peacock Cleaners drinking water well was abandoned on September 2005. The Tudor Motel drinking water well has also been abandoned. Robert Weimer
4/4/2011 Site Characterization Report Approved September 5, 2010 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Monitoring wells MW-16 and MW-17 were not accessible, they are inside a fenced area of the Peacock site. Up to 700 ug/l benzene, 48 mg/l GRO, 6.0 mg/l DRO, 1 ug/l PCE, non-detect (<1 ug/l) TCE, non-detect (<4.0 ug/l) DCE, non-detect (<2 ug/l) methylene Chloride, and 8 ug/l 1,2-DCA. The contaminant concentrations are increasing in 4 of the 4 monitoring wells sampled. Groundwater is 15.35 to 24.32 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the northeast. The Peacock Cleaners drinking water well was abandoned on September 2005. The Tudor Motel drinking water well has also been abandoned. Robert Weimer
5/3/2011 Document, Report, or Work plan Review - other ADEC approved the Remediation System Installation Workplan for the former Chevron Service Station 9-7324, 4417 Lake Otis Parkway site. The work plan proposes to install one replacement monitoring well, and to install a soil vapor extraction and air sparging remediation system. They plan to begin installation in May of 2011, and operate the system from spring to fall each year. Robert Weimer
7/20/2011 Site Visit Site visit to discuss installation of remediation system with RP's consultant. Robert Weimer
7/22/2011 Document, Report, or Work plan Review - other ADEC approves treatment of contaminated purge water. Robert Weimer
7/26/2011 Document, Report, or Work plan Review - other ADEC approves request to transport soil and development and decontamination water generated during the 2011 subsurface investigation at Chevron 9-7324 located at 4417 Lake Otis Parkway, Anchorage to 1441 C Street for temporary storage while awaiting analytical results and ADEC approval. Robert Weimer
8/9/2011 Site Visit Site visit to observe start up testing of the remediation system. We discussed that the site needs to be secured, but the fencing has not been installed yet. Talked with CRA on 8/10/11 about getting fencing put up. Robert Weimer
10/5/2011 Site Visit Site visit to go over boring locations to help define the nature and extent of the contamination near the north side of the property that was found during utility and site work in 2010. PCBs were found in the 10/11/10 stockpile sampling of the excavated soil. Robert Weimer
10/5/2011 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 79186 name: 2010 Contamination north side of property Robert Weimer
10/25/2011 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of contaminated purge water. Robert Weimer
11/4/2011 Document, Report, or Work plan Review - other ADEC approves request for thermal treatment of six drums of contaminated drill cuttings generated during the June 2011 system well installation. Robert Weimer
11/4/2011 Document, Report, or Work plan Review - other ADEC can not approve request for thermal treatment of six drums and 12 super sacks of contaminated drill cuttings generated during the June 2011 system well installation because of chlorinated solvents in the soils. The drum sampling conducted on 6/18/11 found some Tetrachloroethene in one of the samples. Robert Weimer
11/9/2011 Meeting or Teleconference Held Meeting with RP's consultant CRA. The new remediation system was operated for 1 week but is now down for the winter. Robert Weimer
11/22/2011 Offsite Soil or Groundwater Disposal Approved ADEC approves request for disposal of six drums and 12 super sacks of contaminated drill cuttings generated during the June 2011 system well installation at the Columbia Ridge Landfill in Arlington, Oregon. Robert Weimer
12/6/2011 Document, Report, or Work plan Review - other ADEC approves the storage over the winter of 3 drums of contaminated purgewater at the 1441 C Street secure yard. Robert Weimer
3/7/2012 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/28/12. Chevron plans to restart the AS/SVE system in April to operate through the fall. Chevron is to submit a workplan addendum for coducting assessment work in the utility corridor and conduct the work in 2012. Chevron is working on transfering monitoring wells MW-16 and MW-17 on the Peacock property to the MOA. Chevron plans to repair the vaults for monitoring wells MW-1R and MW-2R and develop MW-8RR, AS-4, AS-6, and AS-7. They are to continue semi-annual groundwater monitoring. Robert Weimer
8/21/2012 Offsite Soil or Groundwater Disposal Approved ADEC approves offsite treatment of contaminated purge water. Robert Weimer
11/28/2012 Offsite Soil or Groundwater Disposal Approved ADEC approves offsite treatment of contaminated purge water. Robert Weimer
2/7/2013 Document, Report, or Work plan Review - other First semi-annual 2012 remediation system operation and maintenance report. A new Air Sparge(AS)/Soil Vapor Extraction (SVE) system was installed and began operation on July 26, 2011. They system consists of 4 SVE wells and 7 AS wells. The system was shut down on November 7, 2011 for the winter and restarted on June 10, 2012. The system operated about 7% of the time in the first 6 months of 2012. An estimated 96.9 pounds of GRO were recovered by this system to date. The consultant recommends continued operation of the system to help remediate the remaining soil and groundwater contamination at the site. Robert Weimer
2/27/2013 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/26/13. Chevron proposes to continue to conduct semi-annual groundwater monitoring, they will restart the SVE system in May 2013 for summer/fall operation, they plan to conduct a release investigation in the northern portion of the property where the untility/road work identfied contamination. 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. We discussed that all semi-annual monitoring events need to be at least 120 days apart. Robert Weimer
3/20/2013 Document, Report, or Work plan Review - other June 20, 2012 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Monitoring wells MW-16 and MW-17 were not accessible, they are inside a fenced area of the Peacock site, those monitoring wells are being transfered to the Municipality of Anchorage for their monitoring of that site. Up to 2.3 mg/l DRO, non-detect (<5 ug/l) benzene, non-detect (<0.07 mg/l) GRO, 13 ug/l PCE, 3 ug/l TCE, 4 ug/l DCE, non-detect (<2 ug/l) methylene Chloride, and 11 ug/l 1,2-DCA. The contaminant concentrations are increasing in 1 of the 4 monitoring wells sampled. Groundwater is 15.02 to 24.06 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the west. Robert Weimer
3/26/2013 Update or Other Action DEC conditionally approves the use of a portable activated carbon (gac) filter system for this site to treat water generated during groundwater monitoring. The storage of water at the site or the secure storage area at 1441 C Street is also approved. Robert Weimer
4/8/2013 Document, Report, or Work plan Review - other November 5, 2012 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Monitoring wells MW-16 and MW-17 were not accessible, they are inside a fenced area of the Peacock site, those monitoring wells are being transfered to the Municipality of Anchorage for their monitoring of that site. Up to 0.019 mg/l GRO, 0.47 mg/l DRO, non-detect (<5 ug/l) benzene, 13 ug/l PCE, 6 ug/l TCE, 2 ug/l DCE, non-detect (<2 ug/l) methylene Chloride, and 14 ug/l 1,2-DCA. The contaminant concentrations are increasing in 1 of the 4 monitoring wells sampled. Groundwater is 14.41 to 23.38 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the west. Robert Weimer
7/22/2013 Document, Report, or Work plan Review - other After discussing with RPs consultant the September 4, 2012 Supplemental Site Assessment Work Plan is approved with the following conditions: 1. Field screening is to be conducted at a minimum of every 2 feet of depth. 2. Analytical samples are to be collected, at a minimum, at the depth that appears most contaminated based on field readings and field observations (such as soil staining). 3. Add PCB to the list of analytical methods. 4. Complete copies of field notes are to be included in the report. 5. The three borings proposed at the edge of the excavation need to be just outside (within 4 feet) of the excavated area. If an initial boring location appears to be in the excavation backfill a boring will be drilled further away from the excavation until the boring is just outside the excavated area. 6. Based on the size of the excavated area (approximately 5,000 square feet) and length of sidewalls (approximately 320 linear feet) shown on Figure 2 the four proposed soil borings are not adequate to assess the nature and extent of the contamination. Additional assessment of this area will need to be conducted in the future to complete the assessment to demonstrate that this area meets site cleanup levels. 7. The Department requests that by December 1, 2013 a corrective action plan be submitted for indentified remaining contamination (if any) in this area or a release investigation work plan be submitted for completing the assessment of the base and sidewall of this area. Robert Weimer
10/14/2013 Document, Report, or Work plan Review - other Second semi-annual 2012 remediation system operation and maintenance report. A new Air Sparge(AS)/Soil Vapor Extraction (SVE) system was installed and began operation on July 26, 2011. They system consists of 4 SVE wells and 7 AS wells. The system was shut down on November 8, 2012 for the winter. The system operated about 84% of the time in the second 6 months of 2012. An estimated 230.8 pounds of GRO were recovered by this system to date. The consultant recommends continued operation of the system to help remediate the remaining soil and groundwater contamination at the site. Robert Weimer
10/29/2013 Site Visit Site visit to observe current site conditions and to check proposed inital assessment location for the stained soil observed during the installation of one of the decorative walls on the property on June 14, 2010. Based on the the photos taken on June 14, 2010 the proposed location in the October 2, 2013 work plan needs to be moved about 40 feet to the northeast. (They also need to assess the contamination found during the ACS utility work). Robert Weimer
10/30/2013 Site Characterization Workplan Approved The October 2, 2013 Site Assessment Workplan for Chevron 97324 at Lake Otis and Tudor is approved under the following conditions: 1. (Figure) The initial starting location is to be moved to near the location of the former monitoring well MW-7 shown on your site figure. 2. (4.4) If possible volatile analytical samples should be collected at least 4 feet away from vacuum truck test holes. 3. (4.5) PAH analysis is requested for 10% of the analytical samples (at the highest field readings/observations locations). 4. (4.5) Include full 8260B analysis and RRO. 5. (4.7) Complete copies of field notes are to be provided with the report. Robert Weimer
11/4/2013 Update or Other Action DEC received notification that the conditionally approved October 2, 2013 Site Assessment work is being delayed until the summer of 2014. Robert Weimer
11/21/2013 Meeting or Teleconference Held Discussed the delay of the work in the conditionally approved October 2, 2013 Site Assessment Work. They will provide a revised work plan to conduct the work in 2014. We discussed using vac truck to clear holes then collecting no volatile samples from those holes. They would then go back in the fall of 2014 to collect the volatile samples by hand digging or other approved method. Robert Weimer
2/3/2014 Document, Report, or Work plan Review - other April 30, 2013 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Three replacement monitoring wells were installed in September 2006. Monitoring wells MW-16 and MW-17 were not accessible, they are inside a fenced area of the Peacock site, those monitoring wells are being transfered to the Municipality of Anchorage for their monitoring of that site. Up to 13.1 ug/l benzene, 5.6 mg/l GRO, 1.4 mg/l DRO, 293 ug/l PCE, 49.2 ug/l TCE, 9.1 ug/l DCE, non-detect (<2 ug/l) methylene Chloride, and 114 ug/l 1,2-DCA. The contaminant concentrations are increasing in 3 of the 4 monitoring wells sampled. Groundwater is 15.37 to 24.48 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the southeast. Groundwater concentrations increased over the time the remediation system was shut down for the winter. Samples were collect by both no-purge (Hydrasleeve) and purge (bladder pump) methods. The sampling interval for the bladder pump was not documented in the field notes. The hydrasleeve sampling was from the top of the water column in one monitoring well and 1 foot below the top of the water column in three monitoring wells. Monitoring well MW2R had 5.7 ug/l benzene with no-purge collected from 1 foot below the top of the water column, but had 10.5 ug/l benzene with purge sampling. Robert Weimer
2/27/2014 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/27/2014. They plan to continue operation of the remediation system during the summer and fall and semi-annual groundwater monitoring. 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. The consultant will submit a revised work plan for the assessment in 2014 of the contamination at the northwest corner of the property. If they have not demonstrated that the contamination has not reached groundwater they will need monitoring wells in that area. 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 November 7-8, 2013 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 21 ug/l benzene, 8.7 mg/l GRO, 2.6 mg/l DRO, 24 ug/l PCE, 5.5 ug/l TCE, 13 ug/l DCE, non-detect (<10 ug/l) methylene chloride, and 5.3 ug/l 1,2-DCA. The contaminant concentrations are increasing in 3 of the 4 monitoring wells sampled. Groundwater is 14.75 to 23.67 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the north. Groundwater concentrations increased over the time the remediation system was shut down for the winter. Samples were collect by no-purge (Hydrasleeve) method. Since the hydrasleeve sampling was from 1 foot below the top of the water column in the monitoring wells the results are considered biased low. Robert Weimer
6/6/2014 Site Visit Site visit to observe current site conditions. Robert Weimer
12/12/2014 Document, Report, or Work plan Review - other April 28, 2014 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 17 ug/l benzene, 8.7 mg/l GRO, 1.9 mg/l DRO, 180 ug/l PCE, 33 ug/l TCE, 64 ug/l DCE, non-detect (<10 ug/l) methylene chloride, and 11 ug/l 1,2-DCA. The contaminant concentrations are increasing in 4 of the 4 monitoring wells sampled. Groundwater is 15.17 to 24.11 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the east. Groundwater concentrations increased over the time the remediation system was shut down for the winter. Samples were collected by both purge and no-purge. Purge samples were collected by a bladder pump. No-purge Volatile samples were collect by no-purge (Hydrasleeve) method, non-volatiles samples were collected using a bailer. Since the purge method bladder pump intake was not at the top of the water column (they were 1.89 to 2.0 feet below the soil/water interface) in the monitoring wells the results are considered biased low. The no-purge method was collected over the top of the water column. Robert Weimer
5/19/2015 Document, Report, or Work plan Review - other November 7, 2014 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 7.6 ug/l benzene, 5.8 mg/l GRO, 2.0 mg/l DRO, 120 ug/l PCE, 23 ug/l TCE, 40 ug/l DCE, non-detect (<10 ug/l) methylene chloride, and 1.3 ug/l 1,2-DCA. The contaminant concentrations are increasing in 2 of the 4 monitoring wells sampled. Groundwater is 15.17 to 24.11 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the northeast. Samples were collected by both purge and no-purge. The purge samples were collected by a bladder pump with the intake at the top of the water column as required. Robert Weimer
7/23/2015 Document, Report, or Work plan Review - other 2014 Annual remediation system operation and maintenance report. A new Air Sparge(AS)/Soil Vapor Extraction (SVE) system was installed and began operation on July 26, 2011. They system consists of 4 SVE wells and 7 AS wells. The system was shut down on November 7, 2011 for the winter and restarted on June 10, 2012. Due to safety upgrades the system operated only about 4% of the time in 2014. The consultant recommends continued operation of the system to help remediate the remaining soil and groundwater contamination at the site. Robert Weimer
9/18/2015 Document, Report, or Work plan Review - other Conceptual Site Model submitted. It identified completed pathways for soil and groundwater ingestion, inhalation of outdoor air. Robert Weimer
9/24/2015 Site Visit ADEC received a notification that the door was open to the treatment conex at this site. ADEC conducted a site visit and the door was found to be open. ADEC contacted the environmental consultant for this site (GHD) and they will have an employee with their Anchorage office go out to the site as soon as possible to evaluate if there was any damage and secure the treatment conex. Robert Weimer
9/25/2015 Update or Other Action ADEC received confirmation from the environmental consultant for this site (GHD) and they went out to the site to secure the treatment conex. They verified that nothing was missing or damaged. 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
3/25/2016 Document, Report, or Work plan Review - other 2015 first semi-annual remediation system operation and maintenance report. A new Air Sparge(AS)/Soil Vapor Extraction (SVE) system was installed and began operation on July 26, 2011. They system consists of 4 SVE wells and 7 AS wells. The system was restarted on April 7, 2015. An estimated 267 pounds of GRO has been removed to date. The consultant recommends continued operation of the system to help remediate the remaining soil and groundwater contamination at the site. Robert Weimer
3/30/2016 Document, Report, or Work plan Review - other April 29, 2015 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 0.40 mg/l DRO, non-detect benzene, 0.025 mg/l GRO, 8 ug/l PCE, 3 ug/l TCE, 5 ug/l DCE, and 3 ug/l 1,2-DCA. The contaminant concentrations are increasing in 0 of the 4 monitoring wells sampled. Groundwater is 15.84 to 24.85 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the southeast. Samples were collected by both purge and no-purge. The purge samples were collected by a bladder pump with the intake at the top of the water column as required. The no-purge hydrasleeve sample collected at MW-8RR was collected at the top of water column as required. Robert Weimer
4/14/2016 Document, Report, or Work plan Review - other November 6, 2015 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 0.99 mg/l DRO, non-detect benzene and GRO, 120 ug/l PCE, 25 ug/l TCE, 78 ug/l DCE, and non-detect 1,2-DCA. The contaminant concentrations are increasing in 2 of the 4 monitoring wells sampled. Groundwater is 15.16 to 24.12 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the southeast. Samples were collected by both purge and no-purge. The purge samples were collected by a bladder pump with the intake at the top of the water column as required. The no-purge hydrasleeve sample collected at MW-1R was not collected at the top of water column as required (it was 1.12 to 4.12 feet below soil/water interface), the results of that sample may be biased low. Robert Weimer
4/29/2016 Document, Report, or Work plan Review - other 2015 second semi-annual remediation system operation and maintenance report. A new Air Sparge(AS)/Soil Vapor Extraction (SVE) system was installed and began operation on July 26, 2011. They system consists of 4 SVE wells and 7 AS wells. The system was restarted on April 7, 2015 and shut down on November 8, 2015 for winteriztion. The system operated about 22% of the time in 2015. An estimated 267.8 pounds of GRO has been removed to date. The consultant recommends continued operation of the system to help remediate the remaining soil and groundwater contamination at the site. Robert Weimer
6/1/2016 Site Visit Site visit to check current site conditions. Site appears to be secure. Robert Weimer
6/23/2016 Site Visit Site visit to observe the operation of the vapor extraction/air sparging remediation system. The system had recently shut off and the consultant was evaluating the cause so they could restart the system. Robert Weimer
1/20/2017 Document, Report, or Work plan Review - other April 21, 2016 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 2.7 mg/l DRO, 2.2 mg/l GRO, 10 ug/l benzene, 12 ug/l PCE, 3 ug/l TCE, 7 ug/l DCE, and 9 ug/l 1,2-DCA. The contaminant concentrations increased in 3 of the 4 monitoring wells sampled. Groundwater is 15.79 to 24.79 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the northeast and southeast (on the southern portion of the property). Samples were collected by both purge and no-purge. The purge samples were collected by a bladder pump with the intake at the top of the water column as required. The no-purge hydrasleeve sample collected at MW-1R was not collected at the top of water column as required, the results of that sample may be biased low. Robert Weimer
2/28/2017 Document, Report, or Work plan Review - other 2016 second semi-annual remediation system operation and maintenance report. A new Air Sparge(AS)/Soil Vapor Extraction (SVE) system was installed and began operation on July 26, 2011. They system consists of 4 SVE wells and 7 AS wells. The system has been shut down due to mechanical problems since June 23, 2016. The system is to be repaired and restarted on May 2017. An estimated 267.8 pounds of GRO has been removed to date. The consultant recommends continued operation of the system to help remediate the remaining soil and groundwater contamination at the site. Robert Weimer
7/6/2017 Site Visit Site visit to observe current site conditions. Robert Weimer
11/17/2017 Document, Report, or Work plan Review - other November 1, 2016 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 2.5 mg/l DRO, 2.9 mg/l GRO, 10 ug/l benzene, 7 ug/l cis-1,2-DCA, 12 ug/l PCE, 3 ug/l TCE, 7 ug/l DCE, and 11 ug/l 1,2-DCA. The contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Groundwater is 15.43 to 24.45 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the northeast and southeast (on the southern portion of the property). The purge sample MW-2R was collected by a bladder pump with the intake at the top of the water column as required. The no-purge hydrasleeve samples collected at MW-1R, MW-8RR, and MW-9 may be biased low. Robert Weimer
1/23/2018 Document, Report, or Work plan Review - other May 1, 2017 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 0.87 mg/l DRO, 0.82 mg/l GRO, 6 ug/l benzene, 30 ug/l cis-1,2-DCA , 4 ug/l PCE, 8 ug/l TCE, and 8 ug/l 1,2-DCA. The contaminant concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater is 15.27 to 24.30 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the northeast. The purge sample MW-2R was collected by a bladder pump with the intake at the top of the water column as required. The no-purge hydrasleeve samples collected at MW-1R, MW-8RR, and MW-9 may be biased low. The interval sampled in monitor well MW-1R was not documented in the field notes so it may be biased low. Robert Weimer
1/24/2018 Update or Other Action ADEC requests that all future groundwater samples be conducted after purging with the intake of the pump documented within the top foot of the water column. ADEC also requests that the next groundwater sampling event include full VOC analysis (method 8260) and PAH analysis (method 8270) for all of the sampled monitoring wells. Based on the results of that groundwater sampling the site will be evaluated for a reduction on groundwater monitoring. Robert Weimer
2/8/2018 Document, Report, or Work plan Review - other October 17, 2017 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 1.5 mg/l DRO, 2.1 mg/l GRO, 10 ug/l benzene, 160 ug/l ethylbenzene, 10 ug/l cis-1,2-DCA , 0.9 ug/l PCE, 3 ug/l TCE, and 9 ug/l 1,2-DCA. The contaminant concentrations increased in 1 of the 4 monitoring wells sampled. Groundwater is 15.15 to 24.18 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the west. The purge sample MW-2R was collected by a bladder pump with the intake at the top of the water column as required. The no-purge hydrasleeve samples collected at MW-1R, MW-8RR, and MW-9 may be biased low. Robert Weimer
5/23/2018 Site Visit Site visit to observe the startup of the AS/VES system for the summer season. Robert Weimer
5/31/2018 Document, Report, or Work plan Review - other 2017 remediation system operation and maintenance report. A new Air Sparge(AS)/Soil Vapor Extraction (SVE) system was installed and began operation on July 26, 2011. The system was repaired and restarted on July 2017. An estimated 279.9 pounds of GRO has been removed to date. The consultant recommends continued operation of the system to help remediate the remaining soil and groundwater contamination at the site. Robert Weimer
7/3/2018 Document, Report, or Work plan Review - other April 27, 2018 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 1.4 mg/l DRO, 1.4 mg/l GRO, 7 ug/l benzene, 140 ug/l ethylbenzene, 39 ug/l cis-1,2-DCA , 54 ug/l PCE, 14 ug/l TCE, and 7 ug/l 1,2-DCA. All of the monitoring wells were also sampled for PAHs all were non-detect expect for acenaphthene 0.05 ug/l (530 ug/l cleanup level), and naphthalene 59 ug/l (1.7 ug/l cleanup level). The contaminant concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater is 15.52 to 24.55 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the northwest. The samples were collected by a bladder pump with the intake at the top of the water column as required after purging. Robert Weimer
1/23/2019 Document, Report, or Work plan Review - other 1st semi-annual 2018 remediation system operation and maintenance report. A new Air Sparge(AS)/Soil Vapor Extraction (SVE) system was installed and began operation on July 26, 2011. The system was repaired and restarted on May 10, 2018. An estimated 293.4 pounds of GRO has been removed to date. The consultant recommends continued operation of the system to help remediate the remaining soil and groundwater contamination at the site. Robert Weimer
4/5/2019 Document, Report, or Work plan Review - other October 18, 2018 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 0.38 mg/l DRO, non-detect GRO, non-detect benzene, 0.2 ug/l ethylbenzene, 3 ug/l cis-1,2-DCA , 82 ug/l PCE, 22 ug/l TCE, and 64 ug/l 1,2-DCA. The contaminant concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater is 15.44 to 24.53 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the northwest. The samples were collected by a bladder pump with the intake at the top of the water column as required after purging. Robert Weimer
4/8/2019 Update or Other Action ADEC approves reduction of groundwater monitoring at this site to semi-annual sampling full VOCs (method 8260) including naphthalene in monitoring wells MW-1R, MW-2R, MW-8RR, and MW-9, plus DRO, GRO, and full PAHs (method 8270) in monitoring well MW-2R. Robert Weimer
7/24/2019 Document, Report, or Work plan Review - other 2nd semi-annual 2018 remediation system operation and maintenance report. A new Air Sparge(AS)/Soil Vapor Extraction (SVE) system was installed and began operation on July 26, 2011. The system was repaired and restarted on May 10, 2018. The system operated 69.4% of the time during the 2nd half of 2018. An estimated 31.3 pounds of GRO was removed during this period and 308 pounds of GRO has been removed to date. The consultant recommends evaluating the shut down of the operation of the system at this site. 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
9/25/2019 Meeting or Teleconference Held Meeting with property owner MOA HLB, their consultant, and Chevron's consultant to discuss future site work for closure and future site development. Chevron will provide a work plan for the installation and sampling (on a quarterly basis for a minimum of 1 year) of additional monitoring wells to define the extent of the remaining solvent contamination in the groundwater. They will also submit an updated work plan for the assessment of the contamination in the northwest corner and northern edge. The work plan is to include proposed sampling locations based on utilities. We discussed that the decorative panels may need to be moved to accommodate the assessment. If the soil contamination extends near groundwater then monitoring wells would be required to define the extent of groundwater contamination from that area. Robert Weimer
11/5/2019 Meeting or Teleconference Held Meeting with Chevron's consultant. They will provide an updated site figure showing estimated extent of soil contamination for each of the following: over maximum allowable, over human health, and over migration to groundwater. May need confirmation soil sampling to document current concentrations. They will provide a work plan for conducting the release investigation of the northwest and north edge contamination areas. We discussed that DEC may break out those areas as separate contaminated sites. They will also provide a work plan for conducting a release investigation, including additional monitoring wells and soil and quarterly groundwater sampling where solvent releases occurred at the former service station to compare the groundwater concentrations in those areas with the ones on the southern portion of the property at monitoring well MW9. They will provide a request to move the treatment unit off-site to Fairbanks and to flush mount the portions of the remediation system that is currently above ground. DEC requested that site reports be submitted within 60 days of sampling, VOC analysis include naphthalene, and groundwater monitoring figure include diagram showing historic groundwater flow direction. Robert Weimer
1/6/2020 Document, Report, or Work plan Review - other April 9, 2019 semi-annual groundwater sampling. Most on property monitoring wells have been removed. Up to 1.2 mg/l DRO, 0.87 mg/l GRO, 4 ug/l benzene, 0.5 ug/l ethylbenzene, 67 ug/l cis-1,2-DCA , 85 ug/l PCE, 23 ug/l TCE, and 5 ug/l 1,2-DCA (EDC). The contaminant concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater is 15.36 to 24.35 feet below ground surface in the monitoring wells sampled. Groundwater flow direction was to the south. The samples were collected by a bladder pump after purging. Because the pump intake was not within the top foot of the water column as required (3 monitoring wells were at about 1.5 feet, and for 1 monitoring well the intake depth was not documented at all) the results may be biased low. Robert Weimer
1/7/2020 Update or Other Action DEC sent request to Chevron's consultant (Arcadis) that in future monitoring events on this and other Chevron sites that they are sure to collect water samples with the pump intake within the top foot of the water column at the time of the sampling and that this be documented in the field notes. 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. DEC also requested PAH analysis for all site monitoring wells to be sampled. Robert Weimer
6/12/2020 Document, Report, or Work plan Review - other DEC provided work plan comments for the System Removal and Soil Assessment Work Plan and System Removal and Soil Assessment Work Plan Addendum submitted by Arcadis on March 18, 2020 and May 11, 2020, respectively. This work plan outlines plans to remove a AS/SVE system from the site and complete additional soil borings to further delineate soil contamination. 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
3/2/2021 Document, Report, or Work plan Review - other DEC provided comments on the Revised System Removal and Soil Assessment Work Plan submitted on October 29, 2020 and the Revised System Removal and Soil Assessment Work Plan Addendum submitted on January 14, 2021. The comment letter included approval to removal the Air Sparge/Soil Vapor Extraction (AS/SVE) system, outlined remaining data gaps at the site, and requested revisions to the soil investigation portion of the work plan. Rebekah Reams
6/4/2021 Long Term Monitoring Workplan or Report Review The 2021 First Semi-Annual Sampling Event was conducted on April 7, 2021. Samples were collected from monitoring wells MW-1R, MW-2R, and MW-9 and samples were analyzed for GRO, DRO, VOCs, and PAHs. MW-8RR was unable to be gauged or located due to ice. Cleanup level exceedances for DRO, benzene, ethylbenzene, naphthalene, 1,2,4-trimethylbenzene, 1,2-dichloroethane, TCE, PCE, and cis-1.2-DCE were observed during this sampling event. Depth to groundwater was 15.88 to 24.94 feet below ground surface during this sampling event. Rebekah Reams
7/28/2021 Site Characterization Workplan Approved DEC provided conditional approval for the Revised System Removal, Well Decommissioning, and Soil Assessment Work Plan. This document outlines plans to advance soil borings and collect analytical soil samples in order to assess contaminant attenuation, to evaluate whether chlorinated solvent contamination associated with the former service station is present at the site, and to delineate soil contamination on the norther portion of the property. Rebekah Reams
12/20/2021 Long Term Monitoring Workplan or Report Review The 2021 Second Semi-Annual Sampling Event was conducted on August 26, 2021. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-8RR, and MW-9 and samples were analyzed for GRO, DRO, VOCs, and PAHs. Cleanup level exceedances for DRO, GRO, benzene, ethylbenzene, naphthalene, 1,2,4-trimethylbenzene, 1,2-dichloroethane, TCE, PCE, and cis-1.2-DCE were observed during this sampling event. Groundwater flow direction for this event was not determined as the groundwater table was relatively flat with no predominate flow direction. Depth to groundwater was 15.45 to 24.48 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
3/8/2023 Document, Report, or Work plan Review - other The 2022 Subsurface Investigation Report documents site investigation activities conducted in June 2022. During this investigation, ten soil borings were advanced to evaluate current site conditions. Analytical soil results indicated that all results were below human health and maximum allowable concentration cleanup levels. Migration to groundwater cleanup level exceedances were observed at SB-3 (1,1,2,2-tetrachloroethane), SB-5 (naphthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 1,2-dibromoethane), and at EX-3-2021 (DRO, 1,4-dichlorobenzene). All other analytes were below cleanup levels. Analytical samples were evaluated for DRO, GRO, RRO, VOCs, PAHs, PCBs, and lead during this sampling event. Rebekah Reams
3/9/2023 Long Term Monitoring Workplan or Report Review The 2022 First Semi-Annual Sampling Event was conducted on April 4, 2022. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-8RR, and MW-9 and samples were analyzed for GRO, DRO, VOCs, and PAHs. Cleanup level exceedances for DRO, benzene, ethylbenzene, naphthalene, 1,2-dichloroethane, and TCE were observed during this sampling event. Depth to groundwater was 15.50 to 24.58 feet below ground surface. Rebekah Reams
3/9/2023 Long Term Monitoring Workplan or Report Review The 2022 Second Semi-Annual Sampling Event was conducted on August 16, 2022. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-8RR, and MW-9 and samples were analyzed for GRO, DRO, VOCs, and PAHs. Cleanup level exceedances for ethylbenzene, naphthalene, 1,2,4-trimethylbenzene, 1,2-dichloroethane, PCE, and TCE and were observed during this sampling event. Depth to groundwater was 12.70 to 23.76 feet below ground surface. Rebekah Reams
3/22/2023 Long Term Monitoring Workplan or Report Review DEC provided comments on the Groundwater Sampling Analyte Reduction Request – Groundwater Sampling Work Plan Addendum. This work plan addendum proposes to update the groundwater monitoring schedule to include analysis for EDC, PCE, TCE, and cis-1,2-DCE at monitoring wells MW-1R, MW-8RR, and MW-9 and analysis for DRO, GRO, BTEX, EDB, EDC, naphthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene and 1-methylnaphthalene at monitoring well MW-2R on a semi-annual basis. Rebekah Reams
11/30/2023 Site Visit ADEC staff visited the site to observe current site use, layout, and monitoring well locations. Rebekah Reams
12/11/2023 Offsite Soil or Groundwater Disposal Approved ADEC approved transport of two 55-gallon drums of soil cuttings for offsite transport and disposal Rebekah Reams
1/10/2024 Long Term Monitoring Workplan or Report Review The 2023 First Semi-Annual Sampling Event was conducted on April 7, 2023. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-8RR, and MW-9 and samples were analyzed for GRO, DRO, lead, and select VOCs and PAHs. Cleanup level exceedances for DRO, benzene, ethylbenzene, TCE, and 1,2-dichloroethane were observed during this sampling event. Depth to groundwater was 13.72 to 24.79 feet below ground surface and groundwater flow direction was to the north-northwest. Rebekah Reams
1/26/2024 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77944 1990 site contamination. Rebekah Reams
1/26/2024 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 79186 2010 Contamination north side of property. Rebekah Reams
4/8/2024 Long Term Monitoring Workplan or Report Review The 2023 Second Semi-Annual Sampling Event was conducted on August 7, 2023. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-8RR, and MW-9 and samples were analyzed for GRO, DRO, lead, and select VOCs and PAHs. Cleanup level exceedances for ethylbenzene, naphthalene, EDC, and TCE were observed during this sampling event. Depth to groundwater was 13.13 to 24.15 feet below ground surface and groundwater flow direction was to the north-northwest. Rebekah Reams
4/24/2024 Document, Report, or Work plan Review - other DEC provided comments in response to the Additional Site Investigation Work Plan which proposes to install four groundwater monitoring wells along the western and northern property boundaries and collect soil and groundwater samples to address remaining data gaps at the site. Rebekah Reams
4/30/2024 Site Characterization Workplan Approved ADEC approved the Additional Site Investigation Work Plan following comment resolution. This work plan proposes to install five additional groundwater monitoring wells to define the extent of contamination at the site and to collect soil and groundwater samples. Rebekah Reams
8/26/2024 Long Term Monitoring Workplan or Report Review The 2024 First Semi-Annual Sampling Event was conducted on June 28, 2024. Groundwater samples were collected from monitoring wells MW-1R, MW-2R, MW-8RR, and MW-9 and samples were analyzed for GRO, DRO, lead, and select VOCs and PAHs. Cleanup level exceedances for EDC were observed during this sampling event. Depth to groundwater was 13.03 to 24.08 feet below ground surface and groundwater flow direction was to the northwest. 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

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
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Physical Location: 410 Willoughby