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Site Report: Chevron - #1518 (Former) - Wendy's

Site Name: Chevron - #1518 (Former) - Wendy's
Address: 2927 New Seward Hwy. , Anchorage, AK 99503
File Number: 2100.26.001
Hazard ID: 23595
Status: Active
Staff: Rebekah Reams, 9074512144 rebekah.reams@alaska.gov
Latitude: 61.193728
Longitude: -149.867111
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

Three gasoline and one diesel tank were removed in 1987. The excavation was backfilled without any excavation soil samples collected. Soil borings and monitoring wells were installed later in 1987 identified soil and groundwater contamination at the site. Additional monitoring wells were installed in 1988 to help define the extent of the soil and groundwater contamination. A soil vapor extraction system was installed in 1990 and operated until October 17, 2012. The remediation system removed 2,059 pounds of GRO and 19 pounds of benzene before it was shut down on October 17, 2012. The site is currently being evaluated to determine the best way to remediate the remaining site soil and groundwater contamination. Groundwater contamination extends off-property to the north and west.

Action Information

Action Date Action Description DEC Staff
9/4/1987 Underground Storage Tank Site Characterization or Assessment Chevron sent in sampling results from September and October 1987 groundwater investigation. Benzene went from 6,770 ug/L to 4,400 ug/L. Plan to install 3 additional wells to define area of contamination and further investigate groundwater conditions. Former Staff
12/10/1987 Document, Report, or Work plan Review - other Chevron sent in RZA report of a continued subsurface petroleum hydrocarbon evaluation of site. Monitoring wells 1, 2, & 3 had benzene 423 ug/L, 278 ug/L, & 3,900 ug/L respectively. MW-4 was 0.3 ug/L (all EPA method 602). It was suggested that the product source location to be (or have been) within the subsurface on site soils. No wells within 500' but at least 1 domestic well 1000' from site(7/15/88 Chevron letter to DEC). Former Staff
10/11/1988 Document, Report, or Work plan Review - other Chevron sent in RZA report for subsurface evaluation. Volatile hydrocarbons detected in all soil samples except from borings for MW-5 & MW-10. Approximately 154 mg/kg total BTEX in soils & groundwater was encountered at depths of 9'-12'. All wells had BTEX except MW-10. Benzene was highest at 2,800 ug/l. Former Staff
10/31/1988 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77960 Petroleum contaminant. Former Staff
10/31/1988 Site Added to Database Former Staff
11/1/1988 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU Date changed DB conversion Former Staff
5/17/1989 Document, Report, or Work plan Review - other RZA report received well MW-7 was highest in benzene at 6,000 ug/L and off site well MW-12 located 100' N of northwest corner of property 180 ug/L benzene. 9/89 MW-12 had decreased to 0.16 mg/l benzene & highest level of benzene is now in MW-1 at 4.48 mg/l. Former Staff
4/29/1990 Document, Report, or Work plan Review - other RZA groundwater sampling results received. RZA states that some of the effects of the groundwater levels & petroleum hydrocarbon levels may result from the operation of the onsite vapor extraction system connected to MW-2, MW-2, 6, 7, & MW-8. 7/30/90 results show MW-2 at 7.84 mg/l benzene & MW-7 went to 2.02 mg/l benzene. Former Staff
8/11/1990 Leaking Underground Storage Tank Corrective Action Underway Chevron proposes to install and operate a vapor extraction system at this site. Former Staff
10/5/1990 Document, Report, or Work plan Review - other RZA Consultants sent results from groundwater sampling. Groundwater impacts were detected in 8 of 11 wells; wells MW-5, 10 & 12 contained no detectable BTEX compounds. Benzene soil samples ranged from 0.006 mg/kg in well MW-8 up to 7.84 mg/kg in well MW-2. Former Staff
10/19/1990 Document, Report, or Work plan Review - other RZA groundwater sampling results received. The results suggest the on going vapor extraction remediation is not having the effect of reducing groundwater contamination to the degree expected, it will take longer due to shallow groundwater under site. Former Staff
1/14/1991 Document, Report, or Work plan Review - other Chevron sent in groundwater sampling results. MW-1 highest benzene at 2.93 mg/l and MW-3 highest level of TPH at 59.0 mg/l. Inferred direction of groundwater is to northwest and levels of groundwater contamination slightly lower than in 10/90. Former Staff
3/19/1991 Document, Report, or Work plan Review - other Groundwater sampling results sent in to ADEC. Benzene up to 140 ug/l. Groundwater samples near the UST array & down gradient from array show decreasing levels of aromatic volatile organic compounds. 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 Annual meeting with Chevron and ADEC to review Alaska sites and set goals for 2001. Linda Nuechterlein
4/19/2001 Update or Other Action Sent letter to Chevron approving installation of 1 monitoring well and decommissioning of 2 monitoring wells. Linda Nuechterlein
7/16/2001 Document, Report, or Work plan Review - other Received remediation system report and semi-annual groundwater monitoring report. Linda Nuechterlein
10/3/2001 Document, Report, or Work plan Review - other June 2, 2004 monitoring event. Up to 53.7 mg/l GRO, 93 ug/l benzene, and 261 ug/l MTBE in groundwater. Contamination levels appear to be increasing. Robert Weimer
8/6/2004 Document, Report, or Work plan Review - other June 2, 2004 monitoring event. Up to 8.9 mg/l GRO and 26 ug/l benzene in groundwater. Contamination levels appear to be decreasing. Robert Weimer
8/24/2004 Document, Report, or Work plan Review - other Second quarter of 2004 remediation systems status report. Soil vapor extraction system and air sparge system down since 12/29/03. Repairs are now complete. Robert Weimer
12/1/2004 Document, Report, or Work plan Review - other September 23, 2004 monitoring event. Up to 19.0 mg/l GRO and 30 ug/l benzene in groundwater. Contamination levels appear to be increasing. Robert Weimer
12/10/2004 Document, Report, or Work plan Review - other Third quarter of 2004 remediation systems status report. Soil vapor extraction system and air sparge system is now operational. During this quarter the system operated 1% of the time. To date, the remediation system has removed 2,108 pounds of GRO and 5 pounds of benzene. Robert Weimer
2/10/2005 Document, Report, or Work plan Review - other Fourth quarter of 2004 remediation systems status report. During this quarter the SVE system operated 88% of the time. Due to high groundwater levels, the air sparge system was operational just 14% of the time. During this quarter the system removed 3.4 pounds of GRO and 1.3 pounds of benzene. To date, the remediation system has removed 2,112 pounds of GRO and 6.3 pounds of benzene. Robert Weimer
6/13/2005 Document, Report, or Work plan Review - other First quarter of 2005 remediation systems status report. During this quarter the SVE system operated 86% of the time. The air sparge system was operational 87% of the time. During this quarter the system removed 6.9 pounds of GRO and 2.7 pounds of benzene. To date, the remediation system has removed 2,119 pounds of GRO and 9 pounds of benzene. Robert Weimer
8/4/2005 Update or Other Action Meeting with Chevron to discuss future site work. They are to sample the two highest contaminated wells for EDB and 1,2-DCA. They may request approval to shut down treatment system during the winter because of icing problems. Robert Weimer
8/8/2005 Document, Report, or Work plan Review - other May 16, 2005 monitoring event. Up to 3.8 mg/l GRO and 15 ug/l benzene in groundwater. Contamination levels appear to be decreasing seasonally in the summer and increasing seasonally in the fall. Groundwater flow direction is toward the northwest. Robert Weimer
8/17/2005 Document, Report, or Work plan Review - other Second quarter of 2005 remediation systems status report. During this quarter the SVE system operated 91% of the time. The air sparge system was operational 39% of the time. The air sparge blower is broken and scheduled for repairs in the fall of 2005. During this quarter the system removed 8.4 pounds of GRO and 3.3 pounds of benzene. To date, the remediation system has removed 2,127 pounds of GRO and 12 pounds of benzene. Robert Weimer
10/26/2005 Meeting or Teleconference Held Discussed site with RP's consultant. They are to set up a teleconference between all of the stakeholders for mid November. Robert Weimer
11/28/2005 Document, Report, or Work plan Review - other September 27, 2005 monitoring event. Up to 21 mg/l GRO and 28 ug/l benzene in groundwater. Contamination levels appear to be decreasing seasonally in the summer and increasing seasonally in the fall. Groundwater flow direction is generally toward the northwest. Depth to groundwater is 10 to 13 feet below ground surface. Robert Weimer
12/19/2005 Document, Report, or Work plan Review - other Third quarter of 2005 remediation systems status report. During this quarter the SVE system operated 99% of the time. The air sparge system was operational 0% of the time. The air sparge blower is broken and it is scheduled for repairs in 2006 along with a redesign to the remediation system. During this quarter the system removed 19 pounds of GRO and 4.2 pounds of benzene. To date, the remediation system has removed 2,146 pounds of GRO and 16 pounds of benzene. Robert Weimer
1/30/2006 Document, Report, or Work plan Review - other Fourth quarter of 2005 remediation systems status report. During this quarter the SVE system operated 99% of the time. The air sparge system was operational 0% of the time. The air sparge blower is broken and it is scheduled for repairs in 2006 along with a redesign to the remediation system. During this quarter the system removed 53.1 pounds of GRO and 2.7 pounds of benzene. To date, the remediation system has removed 2,199 pounds of GRO and 19 pounds of benzene. The recovery rates for GRO have increased from the previous quarter. Robert Weimer
2/9/2006 Meeting or Teleconference Held Meeting with Chevron to discuss future site work. Also teleconferenced in representatives of the property owner. They are to sample the two highest contaminated wells for EDB and 1,2-DCA in 2006. They are to switch out the blower, draw more vapors from MW-2 and MW-6, and evaluate whether air sparging is needed in those areas. Robert Weimer
8/22/2006 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of purge water. Robert Weimer
11/29/2006 Document, Report, or Work plan Review - other First quarter of 2006 remediation systems status report. During this quarter the soil vapor extraction (SVE) system and the air sparge system was operational 0% of the time. The air sparge blower is broken and it is scheduled for repairs in 2006 along with a redesign to the remediation system the SVE system is down for electrical problems. To date, the remediation system has removed 2,199 pounds of GRO and 19 pounds of benzene. Robert Weimer
1/24/2007 Document, Report, or Work plan Review - other Second quarter of 2006 remediation systems status report. During this quarter the soil vapor extraction (SVE) system and the air sparge system was operational 0% of the time. The air sparge blower has been replaced and it is scheduled to be restarted in July of 2006. To date, the remediation system has removed 2,199 pounds of GRO and 19 pounds of benzene. Robert Weimer
3/29/2007 Document, Report, or Work plan Review - other May 9, 2006 monitoring event. Up to 13 mg/l GRO and 12 ug/l benzene in groundwater. Contamination levels appear to be decreasing seasonally in the summer and increasing seasonally in the fall. Groundwater flow direction is generally toward the northwest. Depth to groundwater is 10.5 to 11.9 feet below ground surface. Robert Weimer
3/29/2007 Document, Report, or Work plan Review - other September 19, 2006 monitoring event. Up to 24 mg/l GRO and 15 ug/l benzene in groundwater. Contamination levels appear to be decreasing seasonally in the summer and increasing seasonally in the fall. Groundwater flow direction is generally toward the northwest. Depth to groundwater is 10.1 to 11.3 feet below ground surface. Robert Weimer
3/29/2007 Document, Report, or Work plan Review - other Third quarter of 2006 remediation systems status report. During this quarter the soil vapor extraction (SVE) system and the air sparge system was operational 0% of the time. The air sparge blower has been replaced and it is scheduled to be restarted in July of 2006. To date, the remediation system has removed 2,199 pounds of GRO and 19 pounds of benzene. Robert Weimer
4/2/2007 Meeting or Teleconference Held Meeting with RP to discuss site. They are to continue with semi-annual monitoring and sampling (monitoring wells 2,6,7,11R, and 12). Annual sampling of monitoring wells of 1,8,9,10. RP continue active remediation at this site. We discussed that the air sparging system needs to restarted or another active groundwater remediation technology needs to implemented to enhance the remediation of the groundwater at the site. Robert Weimer
4/18/2007 Document, Report, or Work plan Review - other Fourth quarter of 2006 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 88% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 3 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,933 pounds of GRO (revised down from old total of 2,002 pounds) and 19 pounds of benzene. Robert Weimer
6/25/2007 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of one drum of contaminated purge water. Robert Weimer
10/3/2007 Document, Report, or Work plan Review - other May 15, 2007 monitoring event. Up to 14 mg/l GRO, 3 ug/l 1,2-DCA, and 17 ug/l benzene in groundwater. Contamination levels appear to be decreasing seasonally in the summer and increasing seasonally in the fall. Groundwater flow direction is generally toward the northwest. Depth to groundwater is 10.28 to 11.62 feet below ground surface. Robert Weimer
10/12/2007 Document, Report, or Work plan Review - other First quarter of 2007 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 23 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,953 pounds of GRO (revised down from old total of 2,002 pounds) and 19 pounds of benzene. Robert Weimer
10/15/2007 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of one drum of contaminated purge water. Robert Weimer
11/12/2007 Update or Other Action ADEC receives courtesy copy letter from the property owners representative. The letter requests continued operation of the soil vapor extraction system, restating the air sparging system. The letter points out that the dissolved oxygen levels are insufficient for natural attenuation to be effective in a timely manner. Robert Weimer
1/15/2008 Document, Report, or Work plan Review - other Third quarter of 2007 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 83% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 5.1 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,962 pounds of GRO and 19 pounds of benzene. Robert Weimer
1/15/2008 Document, Report, or Work plan Review - other Second quarter of 2007 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 51% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 1.1 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,954 pounds of GRO and 19 pounds of benzene. Robert Weimer
2/7/2008 Update or Other Action Letter from the property owners representative. The letter recommends DCA and analysis in monitoring wells MW-6 and MW-2. Robert Weimer
2/28/2008 Meeting or Teleconference Held Discussed with RP's consultant that ADEC is requesting a more timely cleanup of this site. If Chevron does not feel that operating the existing air sparge/vapor extraction system will be effective then they will need to implement some other active remediation system at this site. 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 soil vapor extraction system. They will sample monitoring well MW-6 for 1,2 DCA and EDB. They will submit a workplan to enhance treatment at this site that will be as minimally intrusive to the business as possible. Robert Weimer
4/1/2008 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
4/30/2008 Update or Other Action ADEC reviews and approves March 31, 2008 Work Plan. The plan proposes to redevelop monitoring wells MW-2 and MW-6, collect monitored natural attenuation data, and evaluate and propose a remedial alternatives to enhance the remediation at this site. Robert Weimer
6/9/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of one drum of contaminated purge water. Robert Weimer
6/23/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves the direct haul to Emerald Alaska for treatment of contaminated water generated during redevelopment of monitoring wells MW-2 and MW-6. Robert Weimer
10/1/2008 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of one drum of contaminated purge water. Robert Weimer
10/2/2008 Document, Report, or Work plan Review - other Fourth quarter of 2007 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 91% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 2 pounds of GRO was removed this quarter. To date, the remediation system has removed 1964 pounds of GRO and 19 pounds of benzene. Robert Weimer
11/7/2008 Document, Report, or Work plan Review - other First quarter of 2008 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 99% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 2 pounds of GRO was removed this quarter. To date, the remediation system has removed 1966 pounds of GRO and 19 pounds of benzene. Robert Weimer
11/21/2008 Document, Report, or Work plan Review - other September 24, 2007 monitoring event. Up to 13 mg/l GRO, 2 ug/l 1,2-DCA, non-detect EDB, and 20 ug/l benzene in groundwater. Contamination levels appear to be decreasing seasonally in the summer and increasing seasonally in the fall. Contamination increased in 2 of the 3 monitoring wells sampled. Groundwater flow direction is generally toward the northwest. Depth to groundwater is 10.04 to 11.26 feet below ground surface. Robert Weimer
11/24/2008 Document, Report, or Work plan Review - other May 19, 2008 monitoring event. Up to 8.4 mg/l GRO, 0.8 ug/l 1,2-DCA, non-detect EDB, and 20 ug/l benzene in groundwater. Contamination levels appear to be decreasing seasonally in the summer and increasing seasonally in the fall. Contamination increased in 3 of the 9 monitoring wells sampled. Groundwater flow direction was toward the northwest. Depth to groundwater is 10.04 to 11.32 feet below ground surface. Robert Weimer
12/11/2008 Document, Report, or Work plan Review - other Second quarter of 2008 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 2 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,968 pounds of GRO and 19 pounds of benzene. Robert Weimer
1/30/2009 Document, Report, or Work plan Review - other Third quarter of 2008 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 99% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 0.7 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,969 pounds of GRO and 19 pounds of benzene. 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. MW6 is to be sampled for EDB and 1-2,DCA. ADEC to review request to deactivate SVE remediation system and monitoried natural attenuation data. Based on ADEC review they may need to operate air sparge system. Robert Weimer
4/13/2009 Document, Report, or Work plan Review - other June 24, 2008 monitoring event. Up to 5.3 mg/l GRO and 20 ug/l benzene in groundwater. Contamination levels increased in 2 of the 9 monitoring wells sampled. Groundwater flow direction was toward the northwest. Depth to groundwater is 10.00 to 11.31 feet below ground surface. Robert Weimer
4/13/2009 Document, Report, or Work plan Review - other September 15, 2008 monitoring event. Up to 1.1 mg/l DRO, 6.8 mg/l GRO and 20 ug/l benzene in groundwater. Contamination levels increased in 3 of the 9 monitoring wells sampled. Groundwater flow direction was toward the northwest. Depth to groundwater is 10.15 to 11.40 feet below ground surface. Robert Weimer
4/13/2009 Document, Report, or Work plan Review - other On September 15, 2008 a slug test was conducted in monitoring wells MW2, MW7, and MW8. Hydraulic conductivity was calculated between 2.92 feet per day in MW8 to 10.0 feet per day in MW10, with an average hydraulic conductivity of 5.86 feet per day. Natural attenuations parameters were collected on 6/24/08 and 9/15/08. The results showed anaerobic conditions with low DO, low nutrients, and low groundwater temperature (low biodegradation activity). Robert Weimer
5/4/2009 Document, Report, or Work plan Review - other Fourth quarter of 2008 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 73% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 1.3 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,970 pounds of GRO and 19 pounds of benzene. Robert Weimer
6/30/2009 Offsite Soil or Groundwater Disposal Approved ADEC approves treatment of one drum of contaminated purge water. Robert Weimer
7/24/2009 Document, Report, or Work plan Review - other First quarter of 2009 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 1.8 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,972 pounds of GRO and 19 pounds of benzene. Robert Weimer
9/21/2009 Site Visit At the request of the project manager, the quality assurance officer was onsite to observe ground water sampling. The sampling was observed over a two day period on 9/21/09 and in the morning of 9/22/09. The second day was required becasue a MW is located in the parking lot and access was needed while the buisness was closed. Aric Frohman and Russ Griesler from Arcadis performed low flow sampling at the site. Samples were collected and analyzed for GRO, BTEX, methane, alkalinity, nitrate, sulfate, EDB, and 1,2-DCA. Brenton Porter
11/30/2009 Document, Report, or Work plan Review - other Second quarter of 2009 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time, except for between March 12, 2009 and April 28, 2009 when the system was shut down to protect it from volcanic ash fall. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 2.0 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,974 pounds of GRO and 19 pounds of benzene. Robert Weimer
1/19/2010 Document, Report, or Work plan Review - other June 1, 2009 monitoring event. Up to 1.1 mg/l DRO, 5.2 mg/l GRO, non-detect (<0.05 ug/l) 1-2DCA, non-detect (<0.0098 ug/l) EDB, and 17 ug/l benzene in groundwater. Contamination concentrations increased in 4 of the 8 monitoring wells sampled. Groundwater flow direction was toward the northwest. Depth to groundwater is 10.32 to 11.62 feet below ground surface. Robert Weimer
2/23/2010 Document, Report, or Work plan Review - other September 21, 2009 monitoring event. Up to 15 mg/l GRO, 2 ug/l 1-2DCA, non-detect (<0.010 ug/l) EDB, and 19 ug/l benzene in groundwater. Contamination concentrations increased in 4 of the 9 monitoring wells sampled. Groundwater flow direction was toward the northwest. Depth to groundwater is 10.40 to 11.70 feet below ground surface. Robert Weimer
3/10/2010 Meeting or Teleconference Held Meeting with Chevron and their consultants. MW2 is to be sampled for PAH the next monitoring event. Chevron to provided an revised workplan for oxygen injection that includes adding MW-2 and MW-6 if the injection into the air sparge wells does not have adequate radius if influence. Chevron said that their site access agreement has expired along with the one for the Sears property. They are currently negotiating new agreements. The remediation system remains off because the no longer have site access to operate and monitor it. 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
4/15/2010 Document, Report, or Work plan Review - other Third quarter of 2009 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 4.4 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,979 pounds of GRO and 19 pounds of benzene. Robert Weimer
5/27/2010 Document, Report, or Work plan Review - other Fourth quarter of 2009 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 2.3 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,981 pounds of GRO and 19 pounds of benzene. Robert Weimer
7/6/2010 Document, Report, or Work plan Review - other Vapor Intrusion Pathway Initial Assessment report. The report recommends continous operation of the SVE to control vapors or conducting vapor sampling. Robert Weimer
4/28/2011 Document, Report, or Work plan Review - other Third quarter of 2010 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 7.65 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,989 pounds of GRO and 19 pounds of benzene. Robert Weimer
7/7/2011 Document, Report, or Work plan Review - other ADEC approves work plan that proposes to install and sample three soil vapor probes near the on property building. Robert Weimer
7/27/2011 Document, Report, or Work plan Review - other Fourth quarter of 2010 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 8.07 pounds of GRO was removed this quarter. To date, the remediation system has removed 1,997 pounds of GRO and 19 pounds of benzene. Robert Weimer
8/1/2011 Document, Report, or Work plan Review - other ADEC approves request to temporarily shut down the soil vapor extraction system (SVE) so they can collect representative soil gas samples. Robert Weimer
9/23/2011 Document, Report, or Work plan Review - other DEC reviewed and approved request for decommissioning damaged monitoring well MW-12. DEC is not requesting a replacement monitoring well at this time. Robert Weimer
9/23/2011 Document, Report, or Work plan Review - other May 23, 2011 monitoring event. Up to 5.1 mg/l GRO, 2.1 mg/l DRO, 2.5 mg/l RRO, 2 ug/l 1-2DCA, non-detect (<0.010 ug/l) EDB, and 20 ug/l benzene in groundwater. Contamination concentrations increased in 6 of the 6 monitoring wells sampled. Groundwater flow direction was toward the northwest. Depth to groundwater is 10.94 to 11.93 feet below ground surface. Monitoring well MW-12 was found to be damaged and was not sampled. Robert Weimer
10/25/2011 Update or Other Action ADEC approves request to transport 2 super sacks of contaminated soil to the secure yard at 1441 C Street for temporary storage. The soil was generated during the installation of three soil vapor probes near the on property building. Robert Weimer
11/1/2011 Document, Report, or Work plan Review - other ADEC approves request to thermally treat 2 super sacks of contaminated soil currently stored at the secure yard at 1441 C Street. The soil was generated during the installation of three soil vapor probes near the on property building. Robert Weimer
1/30/2012 Document, Report, or Work plan Review - other Second quarter of 2011 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 3.75 pounds of GRO was removed this quarter. To date, the remediation system has removed 2,039 pounds of GRO and 19 pounds of benzene. Robert Weimer
3/1/2012 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/28/12. Chevron is to decommission damaged monitoring well MW-12, monitoring well repair, 2nd soil gas sampling event in May 2012, continue operting SVE system, reduce system monitoring from monthly to quarterly, and to evaluate other corrective action for the site for remaining contamination if existing SVE is not going to effectively address. They are to add a rose diagram to the monitoring figure. Robert Weimer
3/5/2012 Document, Report, or Work plan Review - other September 21, 2011 monitoring event. Up to 16 mg/l GRO, 3.8 mg/l DRO, 1.2 mg/l RRO, and 28 ug/l benzene in groundwater. PAH samples collected were below cleanup levels. Contamination concentrations increased in 5 of the 8 monitoring wells sampled. Groundwater flow direction was toward the northwest. Depth to groundwater is 10.53 to 11.90 feet below ground surface. Monitoring well MW-111R and MW-12 not accessible. Robert Weimer
3/5/2012 Document, Report, or Work plan Review - other Third quarter of 2011 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 46% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 2.6 pounds of GRO was removed this quarter. To date, the remediation system has removed 2,042 pounds of GRO and 19 pounds of benzene. Robert Weimer
10/29/2012 Document, Report, or Work plan Review - other Fourth quarter of 2011 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 30% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 1 pound of GRO was removed this quarter. To date, the remediation system has removed 2,043 pounds of GRO and 19 pounds of benzene. Robert Weimer
11/1/2012 Document, Report, or Work plan Review - other First quarter of 2012 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 3 pound of GRO was removed this quarter. To date, the remediation system has removed 2,046 pounds of GRO and 19 pounds of benzene. Robert Weimer
11/14/2012 Document, Report, or Work plan Review - other May 17, 2012 monitoring event. Up to 6.3 mg/l GRO, 2.5 mg/l DRO, 1.0 mg/l RRO, and 14 ug/l benzene in groundwater. PAH samples collected were below cleanup levels. Contamination concentrations increased in 5 of the 8 monitoring wells sampled. Groundwater flow direction was toward the northwest. Depth to groundwater is 10.19 to 11.57 feet below ground surface. Monitoring well MW-111R and MW-12 not accessible. Robert Weimer
11/28/2012 Document, Report, or Work plan Review - other Review Oxygen Injection Summary report. Oxygen injection was conducted in AS-1, AS-2, and AS-3 between September 12, 2011 and October 5, 2011. The injections did not achieve the predicted radius of influence. The consultant does not recommend further injections. Robert Weimer
12/18/2012 Document, Report, or Work plan Review - other Second quarter of 2012 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 97% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 5.9 pound of GRO was removed this quarter. To date, the remediation system has removed 2,052 pounds of GRO and 19 pounds of benzene. Robert Weimer
2/13/2013 Document, Report, or Work plan Review - other Third quarter of 2012 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 7.3 pound of GRO was removed this quarter. To date, the remediation system has removed 2,059 pounds of GRO and 19 pounds of benzene. Robert Weimer
2/26/2013 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/26/13. Chevron proposed continued semi-annual monitoring, has access to the Sears property but MW-11R has been paved over, provide missing reports, they may request to reduce/suspend operting SVE system to evaluate for rebound, and to evaluate other corrective action for the site for remaining contamination if existing SVE 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
4/23/2013 Document, Report, or Work plan Review - other September 24, 2012 monitoring event. Up to 4.6 mg/l GRO, 1.4 mg/l DRO, 0.4 mg/l RRO, and 15 ug/l benzene in groundwater. PAH samples collected were below cleanup levels. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Groundwater flow direction was toward the northwest. Depth to groundwater is 10.07 to 11.45 feet below ground surface. Monitoring well MW-11R and MW-12 were not accessible. Samples were collected by no purge using disposable bailers. Because volatile samples were collected using a bailer the results are considered biased low. Robert Weimer
5/1/2013 Update or Other Action Email message to RP's consultant that monitoring well (MW-11R) that appears to have been paved over needs to be located and either put back into use or properly abandoned in accordance with DEC’s Monitoring Well Guidance. DEC also noted that the second semi-annual groundwater sampling report for this site and it noted that all of the water samples were collected using bailers. As DEC has discussed in the previous meetings with the RP and their consultant, to minimize the loss of volatiles during sample collection the volatile samples are supposed to be collected using an in well pump, bladder pump, or Hydrasleeve. DEC again requests that this is done in all future sampling events. Robert Weimer
5/17/2013 Update or Other Action Consultant called that groundwater samples recently collected were over temperature. They will flag the results as potentially biased low, but still can probably use the data for comparison basis of the purge/no-purge results. Robert Weimer
6/21/2013 Site Visit Site visit to observe current site conditions. Robert Weimer
8/30/2013 Document, Report, or Work plan Review - other November 2-3, 2011 soil gas sampling event. Two multi-level soil vapor probes were installed on September 7, 2011. A third probe was not installed due to encountering concrete at 1.5 feet below ground surface (bgs), this was in the area of highest groundwater contamination. Helium was used for leak testing and was detected in the VP-3 4 feet bgs sample. Soil samples collected during probe installation at 4.5 and 8 feet bgs had up to 0.013 mg/kg benzene and 13 mg/kg GRO. Soil gas samples had up to <3.7 ug/m3 benzene, 240 ug/m3 toluene, 5.7 ug/m3 ethylbenzene, 15.3 ug/m3 xylenes, <24 ug/m3 napthalene, and 1,200 ug/m3 GRO. All soil gas samples were below commercial soil vapor screening levels. The SVE remediation system was shut down 48 hours prior to soil gas sampling. Robert Weimer
8/30/2013 Document, Report, or Work plan Review - other May 11, 2012 soil gas sampling event. Two multi-level soil vapor probes were installed on September 7, 2011. A third probe was not installed due to encountering concrete at 1.5 feet below ground surface (bgs), this was in the area of highest groundwater contamination. Helium was used for leak testing and was detected in the VP-3 4 feet bgs sample. Soil samples collected during probe installation at 4.5 and 8 feet bgs had up to 0.013 mg/kg benzene and 13 mg/kg GRO. Soil gas samples had up to non-detect (<2.5 ug/m3) benzene, non-detect (<3.0 ug/m3) toluene, non-detect (<3.4 ug/m3) ethylbenzene, non-detect (<6.8 ug/m3) xylenes, non-detect (<16 ug/m3) napthalene, and 18,000 ug/m3 GRO. All soil gas samples were below commercial soil vapor screening levels. The SVE remediation system was shut down 48 hours prior to soil gas sampling. Robert Weimer
11/21/2013 Document, Report, or Work plan Review - other Fourth quarter of 2012 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 100% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 2.4 pound of GRO was removed this quarter. To date, the remediation system has removed 2,059 pounds of GRO and 19 pounds of benzene. The system has been down since October 17, 2012 and will be restarted after upgrades. Robert Weimer
12/10/2013 Document, Report, or Work plan Review - other First quarter of 2013 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 0% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 0.0 pound of GRO was removed this quarter. To date, the remediation system has removed 2,059 pounds of GRO and 19 pounds of benzene. The system has been down since October 17, 2012 and will be restarted after safety upgrades. Robert Weimer
2/5/2014 Document, Report, or Work plan Review - other May 9, 2013 groundwater monitoring event. Up to 0.95 mg/l GRO, 1.9 mg/l DRO, non-detect (<1.2 mg/l) RRO, and 3.6 ug/l benzene in groundwater. PAH samples collected were below cleanup levels. Some sample may be biased low due being over temperature (all) and outside holding times (PAH). Contamination concentrations increased in 3 of the 7 monitoring wells sampled. Groundwater flow direction was toward the north. Depth to groundwater is 9.80 to 10.90 feet below ground surface. Monitoring well MW-11R and MW-12 were not accessible. Samples were collect by both no-purge (Hydrasleeve) and purge (bladder pump) methods. The sampling interval for the hydrasleeve and bladder pump was not documented in the field notes. Robert Weimer
2/6/2014 Document, Report, or Work plan Review - other Second quarter of 2013 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 0% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 0.0 pound of GRO was removed this quarter. To date, the remediation system has removed 2,059 pounds of GRO and 19 pounds of benzene. The system has been down since October 17, 2012. The site is currently being evaluated to determine the best way to remediate the remaining site soil and groundwater contamination. Robert Weimer
2/10/2014 Document, Report, or Work plan Review - other Third quarter of 2013 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 0% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 0.0 pound of GRO was removed this quarter. To date, the remediation system has removed 2,059 pounds of GRO and 19 pounds of benzene. The system has been down since October 17, 2012. The site is currently being evaluated to determine the best way to remediate the remaining site soil and groundwater contamination. Robert Weimer
2/19/2014 Document, Report, or Work plan Review - other October 20, 2013 groundwater monitoring event. Up to 3.63 mg/l GRO, 1.2 mg/l DRO, and 4.1 ug/l benzene in groundwater. PAH samples collected were below cleanup levels. Some sample may be biased low due being over temperature (all) and outside holding times (PAH). Contamination concentrations increased in 3 of the 7 monitoring wells sampled. Groundwater flow direction was toward the north by northwest. Depth to groundwater is 9.34 to 10.54 feet below ground surface. Monitoring well MW-11R and MW-12 were not accessible. Samples were collect by no-purge (Hydrasleeve). Because the sampling interval for the hydrasleeve was not documented in the field notes the results may be biased low. Robert Weimer
2/27/2014 Meeting or Teleconference Held Meeting with Chevron and their consultants on 2/27/2014. Chevron has access to the Sears property and has located MW-11R, the SVE system is currently down for maintenance. 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 and/or abandonment of the SVE system. They still need a frozen ground soil gas sampling event to help evaluated the vapor intrusion pathway. Since they were only able to install two gas probes and one of them is more than 10 feet from the building, they may need to install additional soil gas probes to assess the vapor intrusion pathway. 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
4/7/2014 Document, Report, or Work plan Review - other The March 17, 2014 Soil Vapor Investigation work plan is approved. Based on the results of the sampling additional sampling may be required. DEC recommends that they replace the sample train tubing between sampling each vapor probe or depth to minimize any cross contamination. Robert Weimer
6/3/2014 Document, Report, or Work plan Review - other April 8, 2014 soil gas sampling event. Two multi-level soil vapor probes were installed on September 7, 2011. A third probe was not installed due to encountering concrete at 1.5 feet below ground surface (bgs), this was in the area of highest groundwater contamination. Helium was used for leak testing and was detected in the VP-3 8.5 feet bgs sample. Soil samples collected during probe installation at 4.5 and 8 feet bgs had up to 0.013 mg/kg benzene and 13 mg/kg GRO. Soil gas samples had up to non-detect benzene, toluene, ethylbenzene, xylenes, napthalene, and 480 ug/m3 GRO. All soil gas samples were below commercial soil vapor screening levels. The SVE remediation system was not operating prior to the sampling. The consultant recommends decommissioning the vapor probes. Robert Weimer
6/3/2014 Update or Other Action DEC requested work plan for decommissioning the vapor probes. DEC requested that the work plan includes the vapor probe holes being grouted or filled with bentonite chips that are hydrated. Robert Weimer
6/10/2014 Document, Report, or Work plan Review - other Request to decommission the existing SVE system is not approved. As DEC discussed with Chevron in our meeting on 2/27/2014 there has been problems with the groundwater monitoring at this site in demonstrating that the appropriate internal has been sampled in the groundwater monitoring wells. Without representative groundwater data we can’t evaluate whether active remediation would not be needed to address the remaining contamination. Once we get representative groundwater data we can evaluate the request to decommission the existing remediation system or whether the existing system needs to be enhanced/replacement system needs to be installed to address the remaining contamination at this site. Robert Weimer
6/10/2014 Document, Report, or Work plan Review - other Fourth quarter of 2013 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 0% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 0.0 pound of GRO was removed this quarter. To date, the remediation system has removed 2,059 pounds of GRO and 19 pounds of benzene. The system has been down since October 17, 2012. The site is currently being evaluated to determine the best way to remediate the remaining site soil and groundwater contamination. Robert Weimer
6/11/2014 Document, Report, or Work plan Review - other DEC received a revised work plan for only removing the above ground portion of the soil vapor extraction system. DEC has no objection to removing the above ground portions of the soil vapor extraction system at the 2927 Seward Highway site as proposed in the June 10, 2014 Soil Vapor Extraction Decommissioning Procedures work plan, with the understanding that a replacement/enhanced remediation system may be required to address the remaining soil and groundwater contamination at this site. Robert Weimer
9/18/2014 Offsite Soil or Groundwater Disposal Approved ADEC approves offsite treatment of one drum of contaminated purge water. Robert Weimer
1/5/2015 Document, Report, or Work plan Review - other First quarter of 2014 remediation systems status report. During this quarter the soil vapor extraction (SVE) system was operational 0% of the time. A smaller SVE blower was installed in April 2006 and only two extraction wells (MW-2 and MW-6) are operating. The air sparge blower has been replaced but remains off-line. An estimated 0.0 pound of GRO was removed this quarter. To date, the remediation system has removed 2,059 pounds of GRO and 19 pounds of benzene. The system has been down since October 17, 2012. The site is currently being evaluated to determine the best way to remediate the remaining site soil and groundwater contamination. Robert Weimer
1/9/2015 Document, Report, or Work plan Review - other April 30 - May 1, 2014 groundwater monitoring event. Up to 10.2 mg/l GRO, 4.2 mg/l DRO, 1.6 mg/l RRO, 17.3 ug/l Naphthalene and 6.8 ug/l benzene in groundwater. PAH samples collected were below cleanup levels. The samples are considered biased low due being over temperature (all) and outside holding times (PAH). Contamination concentrations increased in 4 of the 8 monitoring wells sampled. Groundwater flow direction was toward the north by northeast. Depth to groundwater is 9.63 to 10.78 feet below ground surface. Monitoring well MW-12 was not accessible. Samples were collect by no-purge (Hydrasleeve) and purge (bladder pump). The samples were collected from the top of the water column, except for monitoring well MW-1 that was not documented for the purge sampling. The results of the two methods were mixed, purge gave higher RRO (1.6 mg/l vs. 0.55 mg/l) and benzene (3.7 ug/l vs. non-detect (<1.0 ug/l)). GRO and DRO where higher with purge in some wells and lower in others. Robert Weimer
7/15/2015 Document, Report, or Work plan Review - other October 14, 2014 groundwater monitoring event. Up to 12.9 mg/l GRO, 2.7 mg/l DRO, 5.8 mg/l RRO, 15.3 ug/l Naphthalene and 4.7 ug/l benzene in groundwater. Contamination concentrations increased in 7 of the 9 monitoring wells sampled. Groundwater flow direction was toward the north. Depth to groundwater is 9.77 to 10.90 feet below ground surface. Monitoring well MW-12 was not accessible. Samples were collect by no-purge (Hydrasleeve for BTEX and GRO and bailer for DRO, RRO, and PAH). The samples were not collected at the top of the water column as required in 5 of the monitoring wells sampled (MW-1, MW-2, MW-6, MW-18, and MW-11R) and monitoring well AS-1 has a submerged top of well screen that had water 8.9 feet above the top of its well screen. The results of these 6 monitoring wells are considered biased low. Robert Weimer
11/13/2015 Document, Report, or Work plan Review - other April 13, 2015 groundwater monitoring event. Up to 20.5 mg/l GRO, 5.7 mg/l DRO, 0.53 mg/l RRO, 1.6 ug/l Naphthalene and 7.6 ug/l benzene in groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction was toward the north. Depth to groundwater is 10.34 to 11.70 feet below ground surface. Monitoring wells MW-1, MW-8, AS-1, and MW-12 was not accessible. Samples were collect by no-purge (Hydrasleeve for BTEX and GRO and bailer for DRO, RRO, and PAH). The samples were collected at the top of the water column as required. 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
6/22/2016 Site Visit Site visit to check on current site conditions. Robert Weimer
6/23/2016 Document, Report, or Work plan Review - other November 19, 2015 groundwater monitoring event. Up to 4.0 mg/l GRO, 2.7 mg/l DRO, 3.8 mg/l RRO, non-detect PAHs and 4.0 ug/l benzene in groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction was toward the north by northwest. Depth to groundwater is 9.84 to 10.93 feet below ground surface. Monitoring wells MW-7, MW-9, MW-10, and MW-12 were not accessible. Samples were collect by no-purge (Hydrasleeve for BTEX and GRO and bailer for DRO, RRO, and PAH). The samples were collected at the top of the water column as required. Robert Weimer
6/30/2016 Site Visit Site visit to observe groundwater sampling. Robert Weimer
8/26/2016 Update or Other Action ADEC approves request to suspend, until further notice, the sampling of monitoring wells MW-9 and MW-10 and request to suspend, until further notice, the PAH sampling of monitoring wells MW-2 and MW-7. ADEC requests a work plan be submitted by October 1, 2016 for the groundwater monitoring at this site. The work plan is to include details on the method(s) of sampling collection, analysis, and sampling frequency. ADEC requests that future groundwater monitoring be conducted by purge method, using a device such as an in-well or bladder pump that minimizes the loss of volatiles. ADEC also requests that the next monitoring event include PAH analysis in monitoring wells MW-1 and MW-6 which continue to have groundwater contamination above cleanup levels. Robert Weimer
3/1/2017 Document, Report, or Work plan Review - other June 30, 2016 groundwater monitoring event. Up to 9.2 mg/l GRO, 2.2 mg/l DRO, 4.4 mg/l RRO, 63 ug/l naphthalene, 0.014 ug/l fluranthene, 0.011 ug/l florene, 0.046 ug/l acenapthene, 0.011 ug/l benzo(b)fluranthene, and 7.0 ug/l benzene in groundwater. Contamination concentrations increased in 4 of the 9 monitoring wells sampled. Groundwater flow direction was toward the north by northwest. Depth to groundwater is 10.32 to 11.51 feet below ground surface. Samples were collect by no-purge (Hydrasleeve for BTEX and GRO and bailer for DRO, RRO, and PAH). The samples were collected at the top of the water column as required. Robert Weimer
9/15/2017 Document, Report, or Work plan Review - other October 31, 2016 groundwater monitoring event. Up to 9.9 mg/l GRO, 3.6 mg/l DRO, 0.32 mg/l RRO, 63 ug/l naphthalene (1.65 ug/l cleanup level), and 6.0 ug/l benzene in groundwater. Contamination concentrations increased in 3 of the 5 monitoring wells sampled. Groundwater flow direction was toward the north. Depth to groundwater is 10.29 to 11.39 feet below ground surface. Samples were collect by a bladder pump after purging. The samples were collected at the top of the water column as required. Robert Weimer
11/20/2017 Document, Report, or Work plan Review - other May 23, 2017 groundwater monitoring event. Up to 14.0 mg/l GRO, 6.8 mg/l DRO, non-detect mg/l RRO, and 7.0 ug/l benzene in groundwater. Contamination concentrations increased in 3 of the 5 monitoring wells sampled. Groundwater flow direction was toward the north by northeast. Depth to groundwater is 10.38 to 11.47 feet below ground surface. Samples were collect by a bladder pump after purging. The samples were collected at the top of the water column as required. Robert Weimer
12/1/2017 Document, Report, or Work plan Review - other September 15, 2017 groundwater monitoring event. Up to 2.9 mg/l GRO, 1.1 mg/l DRO, 0.24 mg/l RRO, and 7.0 ug/l benzene in groundwater. Contamination concentrations increased in 4 of the 4 monitoring wells sampled. Groundwater flow direction was toward the northwest. Depth to groundwater is 10.29 to 11.26 feet below ground surface. Samples were collect by a bladder pump after purging. The samples were collected at the top of the water column as required. Robert Weimer
9/28/2018 Document, Report, or Work plan Review - other April 24, 2018 groundwater monitoring event. Up to 12.0 mg/l GRO, 4.4 mg/l DRO, 0.14 mg/l RRO, and 7.0 ug/l benzene in groundwater. Contamination concentrations increased in 3 of the 4 monitoring wells sampled. Groundwater flow direction was toward the northwest. Monitoring well MW-8 was not sampled due to ice in the well casing. Depth to groundwater is 10.20 to 11.31 feet below ground surface. Samples were collect by a bladder pump after purging. The samples were collected at 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 77960 1988 UST removal release. Robert Weimer
5/1/2019 Document, Report, or Work plan Review - other August 28, 2018 groundwater monitoring event. Up to 7.7 mg/l GRO, 1.6 mg/l DRO, 0.14 mg/l RRO, and 6.0 ug/l benzene in groundwater. Contamination concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow direction was toward the north. Depth to groundwater is 9.87 to 11.13 feet below ground surface. Samples were collect by a bladder pump after purging. The samples were collected at the top of the water column as required. 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
12/23/2019 Document, Report, or Work plan Review - other 2019 First Semi-Annual Groundwater Monitoring event was conducted on April 15, 2019. Groundwater samples were collected from monitoring wells MW-2, MW-7, and MW-8. MW-6 was not sampled due to an obstruction in well. Samples were submitted to the laboratory for GRO, DRO, and BTEX. Groundwater flow direction was to the east and depth to groundwater was 9.45 to 10.97 feet below ground surface. During this sampling event, attempts were made to locate wells AS-1, MW-1, and MW-11R - these wells appear to have been paved over. Rebekah Reams
12/31/2019 Document, Report, or Work plan Review - other 2019 Second Semi-Annual Groundwater Monitoring event was conducted on September 13, 2019. Groundwater samples were collected from monitoring wells MW-2, MW-6, MW-7, and MW-8. Samples were submitted to the laboratory for GRO, DRO, RRO, and BTEX. Groundwater flow direction was to the east and depth to groundwater was 9.41 to 11.15 feet below ground surface. Rebekah Reams
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
6/1/2020 Document, Report, or Work plan Review - other 2020 First Semi-Annual Groundwater Monitoring event was conducted on April 7, 2020. Groundwater samples were collected from monitoring wells MW-2, MW-6, and MW-7. MW-8 was unable to be located. Samples were submitted to the laboratory for DRO, GRO, RRO, and VOCs. Groundwater flow direction was to the east-northeast and depth to groundwater was 10.00 to 11.08 feet below ground surface. Rebekah Reams
12/4/2020 Document, Report, or Work plan Review - other 2020 Second Semi-Annual Groundwater Monitoring event was conducted on October 6, 2020. Groundwater samples were collected from monitoring wells MW-2, MW-6, MW-7, and MW-8. MW-11R was not gauged or sampled due to the lack of an access agreement. Samples were submitted to the laboratory for DRO, GRO, RRO, and VOCs. Groundwater flow direction was to the north and depth to groundwater was 9.97 to 11.22 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
6/7/2021 Document, Report, or Work plan Review - other 2021 First Semi-Annual Groundwater Monitoring event was conducted on April 19, 2021. Groundwater samples were collected from monitoring wells MW-2, MW-6, MW-7, and MW-8. Monitoring well MW-11R could not located and is assumed to have been paved over during a parking lot renovation. Samples were submitted to the laboratory for DRO, GRO, RRO, and VOCs. Groundwater flow direction was to the north-northwest and depth to groundwater was 10.32 to 11.55 feet below ground surface. Rebekah Reams
12/13/2021 Document, Report, or Work plan Review - other 2021 Second Semi-Annual Groundwater Monitoring event was conducted on September 1, 2021. Groundwater samples were collected from monitoring wells MW-2, MW-6, MW-7, and MW-8. Monitoring well MW-11R could not located and is assumed to have been paved over during a parking lot renovation. Samples were submitted to the laboratory for DRO, GRO, RRO, and VOCs. Groundwater flow direction was to the north and depth to groundwater was 9.8 to 11.08 feet below ground surface. Rebekah Reams
7/5/2022 Document, Report, or Work plan Review - other 2022 First Semi-Annual Groundwater Monitoring event was conducted on April 14, 2022. Groundwater samples were collected from monitoring wells MW-7 and MW-8. Monitoring well MW-2 was frozen and could not be gauged or sampled. The well casing of MW-6 was frozen and could not be sampled. Monitoring well MW-11R could not be located and is assumed to have been paved over. Samples were submitted to the laboratory for DRO, GRO, RRO, and VOCs. Groundwater flow direction was to the north and depth to groundwater was 9.98 to 10.51 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
12/2/2022 Site Characterization Workplan Approved DEC approved the Revised Monitoring Well Abandonment and Installation Work Plan which proposes to decommission monitoring wells MW-9, MW-10, and MW-11R, install MW-13, and collect soil and groundwater samples. Rebekah Reams
12/2/2022 Document, Report, or Work plan Review - other DEC provided comments on the Conceptual Site Model Summary report which summarizes the site history, evaluates potential exposure pathways, identifies data gaps, and recommends next steps for the 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
4/26/2023 Update or Other Action Arcadis notified ADEC that in the process of completing utility locates prior to the installation of MW-13, monitoring well MW-12 (which was previously inaccessible and had been planned for decommissioning in 2012) was located. ADEC approved a work plan deviation to repair and develop MW-12 in place of installing MW-13 to achieve the goal of evaluating contaminant concentrations downgradient of MW-6 if existing well MW-12 is determined to be in good condition and capable of generating representative sample results. Rebekah Reams
5/30/2023 Long Term Monitoring Workplan or Report Review 2022 Second Semi-Annual Groundwater Monitoring event was conducted on August 19, 2022. Groundwater samples were collected from monitoring wells MW-2, MW-6, W-7 and MW-8. Monitoring well MW-11R could not be located and is assumed to have been paved over. Samples were submitted to the laboratory for DRO, GRO, RRO, and VOCs. Groundwater flow direction was to the north-northwest and depth to groundwater was 9.48 to 10.78 feet below ground surface. Rebekah Reams
11/16/2023 Offsite Soil or Groundwater Disposal Approved ADEC approved offsite transport and disposal of 10 gallons of soil cuttings and 45 gallons of purge water. Rebekah Reams
11/30/2023 Site Visit ADEC staff visited the site to observe current site use, layout, and monitoring well locations. Rebekah Reams
3/21/2024 Long Term Monitoring Workplan or Report Review 2023 First Semi-Annual Groundwater Monitoring event was conducted on March 24, 2023. Groundwater samples were collected from monitoring wells MW-2, MW-6, W-7, MW-9, and MW-10. Monitoring wells MW-8 or MW-11R could not be located due to snow. Samples were submitted to the laboratory for DRO, GRO, RRO, VOCs, EDB, and lead. Groundwater flow direction was to the north-northeast and depth to groundwater was 10.36 to 11.55 feet below ground surface. Rebekah Reams
3/21/2024 Document, Report, or Work plan Review - other ADEC approved the Groundwater Analyte Adjustment and Well Decommissioning Work Plan. The work plan proposed to update the analyte list for semi-annual groundwater monitoring events and decommission air sparge wells associated with the former air sparge/soil vapor extraction system based on groundwater monitoring results dating back to the 1980s, historic AS/SVE logs, and information outlined in the work plan. Rebekah Reams
4/9/2024 Document, Report, or Work plan Review - other ADEC reviewed the 2023 Monitoring Well Repair and Decommissioning Report which documents the decommissioning of monitoring wells MW-9 and MW-10, and the repair and redevelopment of MW-12. Analytical groundwater samples collected from MW-12 indicated all analytes were not detected or were detected at concentrations below ADEC groundwater cleanup levels. 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
Fax: 907-465-5245
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Physical Location: 410 Willoughby