| Action Date |
Action |
Description |
DEC Staff |
| 8/2/1996 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 78027 |
Former Staff |
| 8/2/1996 |
Site Added to Database |
|
Former Staff |
| 8/3/1996 |
Underground Storage Tank Site Characterization or Assessment |
Gasoline contamination found during tank and piping removal in 1996. The new piping was placed back in the same locations. The replacement tanks were placed at a new location on the west side of the property. 80 cubic yards of contaminated soil was removed and thermally treated at ASR. Contamination was left in place at the tank excavation (up to 3.93 mg/kg benzene and 52.8 mg/kg GRO at 16 feet bgs), at the northwest, northeast, and southeast dispensers (up to 10.2 mg/kg benzene and 4,380 mg/kg GRO at 2 to 4 feet bgs at the SE dispenser), and at the SW product piping (1.48 mg/kg benzene and 7.68 mg/kg GRO at 4 feet bgs).
|
Robert Weimer |
| 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 |
| 3/25/1998 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
|
Former Staff |
| 9/25/1998 |
Document, Report, or Work plan Review - other |
Monitoring wells installed to help define the extent of the groundwater contamination at the site. Soil contamination of 0.1 mg/kg benzene and non-detect GRO was identified at a depth of 5 feet at soil boring B-1 (located about 10 feet south and upgradient of the southeast dispenser island). Monitoring wells were installed in 1998 and 2002 to help define the extent of the groundwater contamination. Two soil samples (MW-3 at the soil/water interface and stockpile SP-1) were analyzed for VOCs and PAHs and they were non-detect.
|
Robert Weimer |
| 12/22/2000 |
Update or Other Action |
SECOR (R. Hoffmore) going to request NFA. I sent an email that site characterization incomplete requested downgradient monitoring wells be installed. |
Linda Nuechterlein |
| 1/30/2001 |
Meeting or Teleconference Held |
Annual meeting with Chevron reps to review Alaska sites and set goals for 2001. |
Linda Nuechterlein |
| 5/25/2001 |
Document, Report, or Work plan Review - other |
ADEC letter approving the installation of 2 additional monitoring wells to help define the lateral extent of the groundwater contamination at the site. The letter notes that as discussed in the January 2001 meeting, prior to closure of the site additional (beyond what is proposed in this workplan) soil and groundwater samples would be required close to the release points. |
Robert Weimer |
| 9/18/2002 |
Document, Report, or Work plan Review - other |
Only one additional monitoring well was installed (instead of two in the workplan) about 50 feet downgradient from the northwest dispenser island and sampled. A monitoring well was not placed near the former tank location because of the proximity of the active fuel piping. The level and extent of the groundwater contamination near the former tanks and the eastern dispenser islands is still not known. The groundwater downgradient of the east dispenser islands may not be captured by the single additional monitoring well. |
Robert Weimer |
| 8/25/2004 |
Document, Report, or Work plan Review - other |
June 1, 2004 groundwater sampling report. Up to 0.71 mg/l GRO, 31 ug/l benzene, and 63 ug/l MTBE in the groundwater. 3 of the 4 monitoring wells are showing an increase in contaminant concentrations. |
Robert Weimer |
| 12/2/2004 |
Document, Report, or Work plan Review - other |
September 24, 2004 groundwater sampling report. Up to 0.16 mg/l GRO, 3 ug/l benzene, and 46 ug/l MTBE in the groundwater. 3 of the 4 monitoring wells are showing a decrease in contaminant concentrations. |
Robert Weimer |
| 7/6/2005 |
Document, Report, or Work plan Review - other |
May 9, 2005 groundwater sampling report. Up to 0.26 mg/l GRO, 1 ug/l benzene, and 20 ug/l MTBE in the groundwater. 3 of the 4 monitoring wells are showing a decrease in contaminant concentrations. Groundwater flows to the northwest. |
Robert Weimer |
| 11/22/2005 |
Document, Report, or Work plan Review - other |
September 22, 2005 groundwater sampling report. Up to ND mg/l GRO, ND ug/l benzene, and 49 ug/l MTBE in the groundwater. MTBE contaminant concentrations are increasing. Groundwater flows to the northwest. Depth to groundwater is 1.8 to 4.1 feet below ground surface. |
Robert Weimer |
| 6/28/2006 |
Update or Other Action |
ADEC requests confirmation soil samples at the northwest corner of the former tank excavation, the northwest dispenser island, the north east dispenser island and the southeast dispenser island. Also requested a monitoring well near the northeast dispenser island and the former tank excavation. |
Robert Weimer |
| 7/14/2006 |
Document, Report, or Work plan Review - other |
ADEC approves work plan to install 2 additional monitoring wells and 2 other soil borings to assess the site. |
Robert Weimer |
| 7/20/2006 |
Document, Report, or Work plan Review - other |
May 8, 2006 groundwater sampling event. Up to 3 ug/l MTBE and non-detect (<0.10 mg/l) GRO and (<0.5 ug/l) benzene in the groundwater. MTBE contaminant concentrations have decreased from the pervious monitoring event, the levels appear to be lower in the spring and higher in the fall when the groundwater drops slightly. Groundwater flows to the northwest. Depth to groundwater is 1.8 to 4.3 feet below ground surface. Two additional monitoring wells are to be installed in July 2006 to help determine groundwater contaminant concentrations closer to the release points. |
Robert Weimer |
| 11/2/2006 |
Meeting or Teleconference Held |
Met with RP's consultant to discuss Conditional Closure request. Need to sample the two new monitoring wells a minimum of 4 quarters to establish trends. Other monitoring wells may be reduced. |
Robert Weimer |
| 1/19/2007 |
Meeting or Teleconference Held |
Discussed site with RP's consultant. They will be submitting the results of the fall 2006 groundwater monitoring event soon. After two more groundwater events in the new monitoring wells we can evaluated the site. We discussed that some of the confirmation soil sampling locations may have to wait for such time that the UST system is removed. |
Robert Weimer |
| 4/6/2007 |
Document, Report, or Work plan Review - other |
August 22, 2006 groundwater sampling event. Up to 0.13 mg/l GRO, 0.6 ug/l benzene, and 31 ug/l MTBE in the groundwater. MTBE contamination levels have increased from the pervious monitoring event, the levels appear to be lower in the spring and higher in the fall when the groundwater drops slightly. Groundwater flows to the northwest. Depth to groundwater is 1.45 to 4.10 feet below ground surface. Two additional monitoring wells were installed in August 2006 to help determine groundwater contaminant concentrations closer to the release points. Results in monitoring wells MW-1, MW-3, and MW-4 may be biased low due to top of screened interval being submerged. |
Robert Weimer |
| 3/3/2008 |
Document, Report, or Work plan Review - other |
May 16, 2007 groundwater sampling event. Up to 0.20 mg/l GRO, 4 ug/l benzene, and 21 ug/l MTBE in the groundwater. Benzene contaminant concentrations have increased from the pervious monitoring event. Groundwater flows to the northwest. Depth to groundwater is 1.50 to 4.38 feet below ground surface. Results in monitoring wells MW-1, MW-3, MW-4, MW-5, and MW-6 may be biased low due to top of screened interval being submerged. |
Robert Weimer |
| 3/4/2008 |
Document, Report, or Work plan Review - other |
September 25, 2007 groundwater sampling event. Up to 92 ug/l MTBE and non-detect GRO and benzene in the groundwater. MTBE contaminant concentrations have increased from the pervious monitoring event. Groundwater flows to the northwest. Depth to groundwater is 1.45 to 4.39 feet below ground surface. Results in monitoring wells MW-1, MW-3, MW-4, MW-5, and MW-6 may be biased low due to top of screened interval being submerged. |
Robert Weimer |
| 5/12/2008 |
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 |
| 9/17/2008 |
Document, Report, or Work plan Review - other |
May 16, 2008 groundwater sampling event. Up to 0.50 mg/l GRO, 1 ug/l benzene, and 56 ug/l MTBE in the groundwater. GRO contaminant concentrations have increased from the pervious monitoring event. Groundwater flows to the northwest. Depth to groundwater is 1.32 to 4.23 feet below ground surface. Results in monitoring wells MW-1, MW-3, MW-4, MW-5, and MW-6 may be biased low due to top of screened interval being submerged. |
Robert Weimer |
| 2/25/2009 |
Meeting or Teleconference Held |
Meeting with Chevron and their consultants. They are to conduct an evaluation of indoor air at this site. Site monitoring is to continue. Chevron's current consultant (CRA) is to evaluate data gaps and submerged well screen data. They are to provide a plan to conduct confirmation soil sampling. |
Robert Weimer |
| 2/26/2009 |
Document, Report, or Work plan Review - other |
September 12, 2008 groundwater sampling event. Up to 1 ug/l benzene, 52 ug/l MTBE and non-detect GRO in the groundwater. contaminant concentrations have decreased from the pervious monitoring event. Groundwater flows to the northwest. Depth to groundwater is 1.54 to 3.66 feet below ground surface. Missing QA/QC data. Results in monitoring wells MW-1, MW-3, MW-4, MW-5, and MW-6 may be biased low due to top of screened interval being submerged. |
Robert Weimer |
| 4/28/2009 |
Update or Other Action |
ADEC approves request for suspending MTBE analysis in monitoring wells MW-1, MW-2, MW-3, and MW-4. MTBE analysis is to continue in monitoring wells MW-5 and MW-6. |
Robert Weimer |
| 6/4/2009 |
Meeting or Teleconference Held |
Teleconference with RPs consultant (CRA). They will subit a request for thermal treatment of old drums of drill cuttings currently stored at the site. |
Robert Weimer |
| 6/8/2009 |
Offsite Soil or Groundwater Disposal Approved |
Approve request for thermal treatment of 4 drums of contaminated drill cuttings from 2006 site assessment. |
Robert Weimer |
| 6/22/2009 |
Site Visit |
At the request of the project manager, Robert Weimer, the quality assurance officer conducted a site visit on June 19, 2009 to oversee sampling activities by CRA consultants. While onsite six monitoring wells were sampled for GRO/BTEX. Additionally, two wells were also sampled for MTBE and GRO/BTEX. No major deviations from standard sampling practices were noted. A copy of the QA field report has been placed in the field file and in the QA file. |
Brenton Porter |
| 8/20/2009 |
Document, Report, or Work plan Review - other |
Approve request to suspend groundwater monitoring in monitoring wells MW-1 and MW-2. |
Robert Weimer |
| 10/15/2009 |
Document, Report, or Work plan Review - other |
June 19, 2009 groundwater sampling event. Up to 1.1 ug/l benzene, 55 ug/l MTBE, and non-detect GRO in the groundwater. Contamination concentrations are simular to the pervious monitoring event. Groundwater flows to the northwest. Depth to groundwater is 2.03 to 4.54 feet below ground surface. Missing QA/QC data. Results in monitoring wells MW-1, MW-3, MW-4, MW-5, and MW-6 may be biased low due to top of screened interval being submerged. |
Robert Weimer |
| 10/26/2009 |
Document, Report, or Work plan Review - other |
ADEC approves request for treatment of contaminated purge water. |
Robert Weimer |
| 2/18/2010 |
Document, Report, or Work plan Review - other |
September 7, 2009 groundwater sampling event. Up to 1.1 ug/l benzene, 78 ug/l MTBE , and non-detect GRO in the groundwater. Contamination concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 1.49 to 4.36 feet below ground surface. Results in monitoring wells MW-3, MW-4, MW-5, and MW-6 may be biased low due to top of screened interval being submerged. |
Robert Weimer |
| 3/11/2010 |
Meeting or Teleconference Held |
Meeting with Chevron and their consultants on 3/10/10. Chevron to submit a workplan to install replacement monitoring wells for MW5 and MW6, with PAH soil sampling. Monitoring wells MW3 & MW4 may need to be replaced if contamination found at the replacement MW5 or MW6. 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 |
| 4/6/2010 |
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 the remaining concentrations in the soil and groundwater at this site. The vapor intrusion evaluation will be revised as necessary when new site data is aquired. |
Robert Weimer |
| 5/28/2010 |
Document, Report, or Work plan Review - other |
Approve request to suspend MTBE sampling in monitoring wells MW-5 and MW-6. |
Robert Weimer |
| 6/3/2010 |
Document, Report, or Work plan Review - other |
Review of June 2, 2010 Monitoring Well Installation Workplan. Provided comments to Chevron's consultant. They will submit a revised work plan soon. DEC requested that the replacement monitoring well MW6 be sampled for PAH in addition to GRO and BTEX during its first groundwater monitoring event. |
Robert Weimer |
| 6/3/2010 |
Document, Report, or Work plan Review - other |
Reviewed June 3, 2010 Monitoring Well Installation Workplan. The workplan was updated based on the comments provided to Chevron's consultant. The workplan calls for decommissioning and replacing 3 monitoring wells (MW-3, MW-5, and MW-6) which had submerged well screens. These monitoring wells will sampled in the summer and fall of 2010, then abandoned prior to winter. |
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 |
| 11/1/2010 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approves request for thermal treatment of three drums of contaminated dril cuttings. |
Robert Weimer |
| 3/9/2011 |
Document, Report, or Work plan Review - other |
June 22, 2010 groundwater sampling event. Up to 16 mg/l GRO, and 4,400 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 4 monitoring wells sampled. Monitoring well MW-6R (near the former tanks) also had PAH analysis with 15 PAH compounds detected including 0.014 ug/l Benzo(a)pyrene, 0.014 ug/l Dibenz(a,h)anthracene, 0.061 ug/l Fluoranthene, 0.18 ug/l Naphthalene, 0.28 ug/l Phenanthene, and 0.11 ug/l Pyrene. Groundwater flows to the northwest. Depth to groundwater is 2.19 to 4.43 feet below ground surface. Replacement monitoring wells MW-3R, MW-5R, and MW-6R have been installed to get better groundwater quality data. The replacement monitoring well MW-3R has much higher contamination concentrations than the previous monitoring well that had a submerged well screen. |
Robert Weimer |
| 3/10/2011 |
Document, Report, or Work plan Review - other |
August 4, 2010 groundwater sampling event. Up to 6.4 mg/l GRO, and 680 ug/l benzene in the groundwater. Contamination concentrations increased in 0 of the 4 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 1.42 to 4.20 feet below ground surface. Replacement monitoring wells MW-3R, MW-5R, and MW-6R have been installed to get better groundwater quality data. |
Robert Weimer |
| 4/19/2011 |
Update or Other Action |
Call from DOWL regarding the potential impact of this site on the property on the northwest corner of the intersection. They may recommend that a monitoring well be installed on that property near the intersection. They plan to forward any results to ADEC. |
Robert Weimer |
| 7/19/2011 |
Document, Report, or Work plan Review - other |
ADEC conditionally approves the work plan to install and sample one monitoring well down gradient of monitoring well MW-3R. The work plan is approved on the condition that the monitoring well be placed, as utilities allow, to the northwest of monitoring well MW-3R and that at least one analytical soil sample be collected at the soil/water interface. |
Robert Weimer |
| 7/19/2011 |
Document, Report, or Work plan Review - other |
On June 15, 2010 monitoring wells MW-3, MW-5, and MW-6 were decommissioned and replacement monitoring wells MW-3R, MW-5R, and MW-6R were installed to get better groundwater quality data with well screens from 1 to 14 feet below ground surface. |
Robert Weimer |
| 7/21/2011 |
Conceptual Site Model Submitted |
Conceptual site model identified completed direct contact, ingestion, and inhalation pathways from the shallow benzene and GRO contaminated soil and groundwater. |
Robert Weimer |
| 8/16/2011 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approves request to purge monitoring wells prior to sampling. Purging and sampling will be conducted using a bladder pump. |
Robert Weimer |
| 10/24/2011 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approves treatment of contaminated purge water. |
Robert Weimer |
| 10/26/2011 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approves request for treatment of one drum of monitoring well purge water. |
Robert Weimer |
| 11/4/2011 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approves request for thermal treatment of 1 drum of contaminated soil. The soil was generated during the August 2011 subsurface investigation. |
Robert Weimer |
| 2/27/2012 |
Document, Report, or Work plan Review - other |
May 21, 2011 groundwater sampling event. Up to 26.0 mg/l GRO, and 1,700 ug/l benzene in the groundwater. These are the highest concentrations ever found in the groundwater at this site. Contamination concentrations increased in 3 of the 4 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 1.47 to 4.41 feet below ground surface. Replacement monitoring wells MW-3R, MW-5R, and MW-6R have been installed to get better groundwater quality data. |
Robert Weimer |
| 3/7/2012 |
Meeting or Teleconference Held |
Meeting with Chevron and their consultants on 2/28/12. Chevron is to decommission damaged monitoring well MW-2. They are to continue semi-annual groundwater monitoring. If monitoring well MW-7 remains over cleanup levels they may need to install additional monitoring wells to define the extent of the groundwater contamination. |
Robert Weimer |
| 5/17/2012 |
Document, Report, or Work plan Review - other |
ADEC approved work plan for decommissioning damaged monitoring well MW-2. |
Robert Weimer |
| 8/17/2012 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approves request for offsite treatment of two drums of monitoring well purge water. |
Robert Weimer |
| 9/25/2012 |
Update or Other Action |
Call from DOT. When working on the northern most driveway into the Chevron property on the east side of Victor Road they encountered a seep of shallow groundwater about 30 feet west of monitoring well MW-3R. They suspect that it is from a leaking water line and they are having the water tested for chlorine and floride. |
Robert Weimer |
| 10/30/2012 |
Document, Report, or Work plan Review - other |
On August 22, 2011 an additional monitoring well (MW-7) was installed and sampled to help assess the extent of the contamination downgradient of monitoring well MW-3R. Monitoring well MW-7 was screened from 1 to 11 feet below ground surface (bgs). A silt/clay layer was encountered at 5 feet bgs and it extended to the base of the monitoring well. A soil sample was collected at 1 foot bgs at the soil/water interface, it had 5.8 mg/kg DRO, <0.6 mg/kg GRO, and <0.0064 mg/kg benzene. |
Robert Weimer |
| 1/8/2013 |
Document, Report, or Work plan Review - other |
August 23, 2011 groundwater sampling event. Up to 5.0 mg/l GRO, and 890 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 4 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 0.60 to 4.32 feet below ground surface. Replacement monitoring wells MW-3R, MW-5R, and MW-6R have been installed to get better groundwater quality data. |
Robert Weimer |
| 1/8/2013 |
Document, Report, or Work plan Review - other |
May 24, 2012 groundwater sampling event. Up to 0.2 mg/l GRO, and 30 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 3 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 0.90 to 4.38 feet below ground surface. Replacement monitoring wells MW-3R, MW-5R, and MW-6R have been installed to get better groundwater quality data. Samples were collected using a bladder pump after the monitoring wells were purged. |
Robert Weimer |
| 2/15/2013 |
Document, Report, or Work plan Review - other |
August 1, 2012 groundwater sampling event. Up to 0.61 mg/l GRO, and 48 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 5 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 0.63 to 4.2 feet below ground surface. Replacement monitoring wells MW-3R, MW-5R, and MW-6R have been installed to get better groundwater quality data. Samples were collected using a bladder pump after the monitoring wells were purged. |
Robert Weimer |
| 2/15/2013 |
Document, Report, or Work plan Review - other |
On May 23, 2012 monitoring well MW-2 was decommissioned due to a damaged well casing. |
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 to monitor for natural attenuation and trends. We discussed that all semi-annual monitoring events need to be at least 120 days apart. |
Robert Weimer |
| 3/26/2013 |
Document, Report, or Work plan Review - other |
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 |
| 4/24/2013 |
Update or Other Action |
DEC approved request to suspend until further notice the sampling of monitoring wells MW-5R and MW-6R. |
Robert Weimer |
| 1/23/2014 |
Document, Report, or Work plan Review - other |
May 1, 2013 groundwater sampling event. Up to 0.045 mg/l GRO, and 0.18 ug/l benzene in the groundwater. The previous most contaminated monitoring well (MW-3R) was not sampled this monitoring event because it was plugged with ice. Contamination concentrations increased in 1 of the 2 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 1.55 to 6.89 feet below ground surface. Replacement monitoring wells MW-3R, MW-5R, and MW-6R have been installed to get better groundwater quality data. Samples were collected by both using no purge with hydrasleeves, and using a bladder pump after the monitoring wells were purged. The sample interval for the bladder pump was not document in field notes. The hydrasleeve samples were collected from the interval 1 to 4 feet below groundwater surface. |
Robert Weimer |
| 2/18/2014 |
Document, Report, or Work plan Review - other |
September 17, 2013 groundwater sampling event. Up to 0.072 mg/l GRO, and 3.6 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 3 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 1.41 to 4.09 feet below ground surface. Replacement monitoring wells MW-3R, MW-5R, and MW-6R have been installed to get better groundwater quality data. Samples were collected from the top 3 feet of the water column in each monitoring by no purge using hydrasleeves. |
Robert Weimer |
| 2/27/2014 |
Meeting or Teleconference Held |
Meeting with Chevron and their consultants on 2/27/2014. Because of problems with last year’s purge/no-purge sampling the next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data or they will switch to no purge for future sampling events. We discussed that the groundwater samples needs to be collected as close as possible to the soil/water interface, with the pump intake within a foot of the soil/water interface at the time of the sampling. After reviewing the results of the May 2014 groundwater sampling event the consultant may be requesting a reduction in ground water monitoring or closure with IC's. 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 |
| 7/29/2014 |
Update or Other Action |
Based on the results of the 6/6/2014 purge/no purge sampling the DEC has no objection to doing no purge sampling at this site. They plan to continue to conduct purge sampling to demonstrate trends for site closure. |
Robert Weimer |
| 10/2/2014 |
Document, Report, or Work plan Review - other |
DEC provides review comments on the September 2014 confirmation soil boring work plan. The work plan proposes to collect soil samples at only two locations (near the northeast dispenser and the southeast dispenser). The September 2014 work plan is not approved. There are other areas of soil contamination at the site that need confirmation samples. The work plan needs to include copies of tables for all site soil and groundwater sampling results.
Because BTEX, GRO, and MTBE contamination has been identified at the site confirmation soil samples need to be analyzed for those contaminants. Confirmation soil samples need to be collected from non-backfill soil at the same depth that they were had identified previously and the soil/water interface. A third sample depth will need an analytical sample if another depth in that boring appears to be more contaminated based on field readings/observations. Complete copies of field notes need to be included in the report. More detail needs to be provide on how the soil samples are to be collected (hand driven split spoon ahead of the auger bit?) and field readings are to be taken.
|
Robert Weimer |
| 10/22/2014 |
Document, Report, or Work plan Review - other |
DEC provides review comments on the October 2014 revised confirmation soil boring work plan. The work plan proposes to collect soil samples at six locations. Because it is currently an active gas station they may need to wait and collect the dispenser confirmation soil samples (five locations) when the current UST system is updated or removed. They will provide an updated work plan for review and approval to cover the collection of confirmation samples at four locations (MW3R/MW7, P4, T5, and sidewall near T7/8) outside of the current UST system. We discussed that collecting volatile samples from a hand auger is not approved due to the loss of volatiles. This confirmation soil sampling work was not conducted. |
Robert Weimer |
| 10/28/2014 |
Update or Other Action |
DEC has no objection to suspending groundwater sampling in the 1st quarter, but there needs groundwater monitoring for the other 3 quarters to establish trends. Based on the results of the soil sampling DEC can evaluate what long term groundwater monitoring would be required for this site. |
Robert Weimer |
| 4/6/2015 |
Document, Report, or Work plan Review - other |
June 6, 2014 groundwater sampling event. Up to 0.051 mg/l GRO, and 2.4 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 3 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 1.75 to 4.31 feet below ground surface. Sampling was conducted by both no-purge with Hydrasleeves and purge with a bladder pump. The bladder pump results from two of the monitoring wells (MW-7 and MW-3R) are considered biased low because the pump intake was not at the top of the water column as required. The pump intake was at 2.4 to 2.51 below the soil/water interface during sampling of those wells. |
Robert Weimer |
| 4/15/2015 |
Document, Report, or Work plan Review - other |
July 31, 2014 groundwater sampling event. Up to 0.05 mg/l GRO, and 1.1 ug/l benzene in the groundwater. Contamination concentrations increased in 0 of the 3 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 1.57 to 4.04 feet below ground surface. Samples were collected from the top 1 foot of the water column in each monitoring by purge sampling using a bladder pump. |
Robert Weimer |
| 4/20/2015 |
Document, Report, or Work plan Review - other |
November 10, 2014 groundwater sampling event. Up to 0.05 mg/l GRO, and 0.32 ug/l benzene in the groundwater. Contamination concentrations increased in 0 of the 3 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 1.85 to 4.45 feet below ground surface. Replacement monitoring wells MW-3R, MW-5R, and MW-6R have been installed to get better groundwater quality data. Samples were collected from the top 1 foot of the water column in each monitoring by purge sampling using a bladder pump. |
Robert Weimer |
| 4/21/2015 |
Update or Other Action |
DEC approves reducing monitoring to an annual basis for GRO and BTEX of monitoring wells MW-3R, MW-4, and MW-7 to be conducted in the May/June/July of each year. DEC has no objection to decommissioning monitoring wells MW-1, MW-5R, and MW-6R in accordance with the DEC September 2013 Monitoring Well Guidance. |
Robert Weimer |
| 2/1/2016 |
Document, Report, or Work plan Review - other |
May 30, 2015 groundwater sampling event. Up to 0.059 mg/l GRO and 1.0 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 3 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 1.94 to 4.32 feet below ground surface. Samples were collected by purge sampling using a bladder pump. The results for monitoring wells MW-4 and MW-7 are considered biased low because they did not document in the field notes that the pump intake depth was within the top foot of the water column at the time of sampling as specified in the sampling plan. |
Robert Weimer |
| 9/28/2016 |
Document, Report, or Work plan Review - other |
DEC approves work plan for decommissioning monitoring wells MW-1, MW-5R, and MW-6R. |
Robert Weimer |
| 2/15/2017 |
Document, Report, or Work plan Review - other |
July 5, 2016 groundwater sampling event. Up to 0.026 mg/l GRO and non-detect benzene in the groundwater. Contamination concentrations increased in 0 of the 3 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 1.20 to 4.31 feet below ground surface. Samples were collected by purge sampling using a bladder pump. The pump intake depth was within the top foot of the water column at the time of sampling as specified in the sampling plan. |
Robert Weimer |
| 11/27/2017 |
Document, Report, or Work plan Review - other |
July 11, 2017 groundwater sampling event. Up to 0.015 mg/l GRO and non-detect benzene in the groundwater. Contamination concentrations increased in 0 of the 3 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater was 1.75 to 3.88 feet below ground surface. Samples were collected by purge sampling using a bladder pump. The pump intake depth was within the top foot of the water column at the time of sampling as specified in the sampling plan. |
Robert Weimer |
| 12/1/2017 |
Update or Other Action |
Based on the information provided DEC is recommending the remaining site monitoring wells be decommissioned in preparation for closure with IC status. DEC requests a work plan for the decommissioning of the remaining site monitoring wells. |
Robert Weimer |
| 12/1/2017 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78027 1996 UST contamination. |
Robert Weimer |
| 11/28/2018 |
Document, Report, or Work plan Review - other |
DEC approval of the 2018 Well Decommissioning Work Plan and Amendment. The work plan proposes to decommission the remaining three monitoring wells at the site. DEC requests documentation once the decommissioning has been completed. |
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. After reviewing the figure, DEC will evaluate the site for closure with ICs. They confirmed that the site monitoring wells have not been decommissioned yet. We discussed that we are now using environmental covenant IC (UECA) instead of notice of environmental contamination IC (NEC). May need confirmation soil sampling to document current concentrations to demonstrate levels for closure. |
Robert Weimer |
| 12/16/2019 |
Document, Report, or Work plan Review - other |
ADEC request that for all future monitoring events for all of the Chevron sites that the field notes document the measurement of the pump intake is within the top foot of the water column at the time of the sampling. |
Robert Weimer |
| 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 |
| 2/5/2021 |
Document, Report, or Work plan Review - other |
DEC provided comments on the Site Closure Request submitted by Arcadis on November 20, 2020. This report summarizes the site history and provides cumulative risk calculations, activity and use limitations, and an updated Conceptual Site Model (CSM) to support the request for site closure with institutional controls.
DEC does not consider this site to be ready for closure under current policy. Sample locations determined to be above human health cleanup levels have not been evaluated since initial sampling was completed in 1996. Additionally, historic analytical results have not characterized the presence of volatile organic compounds (VOCs) or polynuclear aromatic hydrocarbons (PAHs) in areas determined to have elevated concentrations of contaminants. |
Rebekah Reams |
| 8/13/2021 |
Site Characterization Workplan Approved |
DEC provided conditional approval for the Soil Investigation Work plan. This work plan proposes to advance two soil borings to evaluate contaminant concentrations that have exceeded human health and maximum allowable contaminant concentrations observed in 1996 at sample locations D-5, D-5A and D-6A. Analytical soil samples will be analyzed for the full suite of VOCs and PAHs in addition to GRO at these locations in order to determine whether these COPCs are present within the source area. |
Rebekah Reams |
| 9/8/2022 |
Meeting or Teleconference Held |
DEC met with Chevron and their consultant to discuss challenges presented during the soil investigation field work. Due to the presence of utilities in the area, soil borings could not be advanced to confirm contaminant concentrations at the former boring locations where human health cleanup level exceedances were observed in 1996. Chevron will provide a revised closure request that addresses DEC's report comments dated February 5, 2021. |
Rebekah Reams |
| 12/21/2023 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78027 1996 UST contamination. |
Rebekah Reams |
| 3/20/2024 |
Document, Report, or Work plan Review - other |
ADEC sent the draft environmental covenant with tracked changes to the responsible party for review and revision. |
Rebekah Reams |
| 5/13/2024 |
Update or Other Action |
Environmental covenant revisions are complete, final version of the covenant will be sent to the landowner for signature. |
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 |
