Site Report: Chevron - #1252

Site Name:	Chevron - #1252
Address:	11836 Old Glenn Hwy., Eagle River, AK 99577
File Number:	2107.26.003
Hazard ID:	23705
Status:	Active
Staff:	Rebekah Reams, 9074512144 rebekah.reams@alaska.gov
Latitude:	61.327556
Longitude:	-149.570702
Horizontal Datum:	WGS84

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

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

Three gasoline tanks and their product lines were removed during facility upgrade in 1995. Up to 0.72 mg/kg benzene and 1,100 mg/kg GRO at 10 feet below ground surface at the western dispenser. Most of the remaining soil contamination is near the active UST system. Four monitoring wells (MW-1, MW-2, MW-3, and MW-4) were installed in 2003 to help define the extent of the groundwater contamination. Additional releases were documented in 2003. In March 2003 seven soil borings were sampled at the site. Up to 2,300 mg/kg DRO (20 feet bgs to east of tanks), and 0.30 mg/kg benzene (20 feet bgs at southeast of piping run). Six groundwater samples were collected with up to 56 mg/l DRO (near north piping run), and 19 ug/l benzene in the groundwater (north of tanks). Two additional monitoring wells (MW-5 and MW-6) were installed in 2006. On October 23, 2008 a replacement monitoring well was installed MW-1R, and monitoring well MW-1 was decommissioned. The decommissioned monitoring well was installed to 23.25 feet below ground surface (bgs) but historically contained insufficient groundwater for sampling. Soil samples were collected during the installation of the replacement monitoring well, up to 4.1 mg/kg benzene (at 21 feet bgs), 9.1 mg/kg GRO, and 52 mg/kg DRO in the soil samples collected. These results are biased low because the monitoring well was installed using an air rotary rig. Groundwater flows to the northwest. Chevron continues to monitor the groundwater at this active gas station site. Chevron is to submit a work plan for the installation and sampling of at least 3 monitoring wells near (2, 3, 5) to assess the shallow groundwater contamination trends and migration. Chevron plans to collect soil samples to assess current soil contamination concentrations and install monitoring wells in the shallower aquifer so site can be evaluated for closure. It appears that the site has two aquifers one at 16 to 24 feet bgs, and the other at 29 to 37 feet bgs. Tighter soils with some silt and clay was encountered at about 20 feet bgs over much of the site. The highest concentrations of soil and groundwater contamination have been identified down to the first aquifer. Currently all of the site monitoring wells are only in the 2nd aquifer. The shallower contamination is also impacting the deeper aquifer as evidenced by groundwater contamination in the deeper aquifer.

Action Information

Action Date	Action	Description	DEC Staff
11/17/1995	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 77980 Site added to database.	Former Staff
11/17/1995	Site Added to Database		Former Staff
1/23/1996	Leaking Underground Storage Tank Cleanup Initiated - Petroleum	LUST corrective action underway.	Former Staff
1/23/1996	Underground Storage Tank Site Characterization or Assessment	Site assessment conducted during the underground storage tank system removal. Three gasoline tanks and their piping were removed and replaced with new tanks and piping. Sampling conducted between August 29, 1995 and September 2, 1995. 0.72 mg/kg benzene and 1,100 mg/kg GRO at 10 feet below ground surface at the western dispenser.	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 ADEC & Chevron reps to review AK sites and set goals for 2001.	Linda Nuechterlein
3/9/2003	Site Characterization Report Approved	In March 2003 seven soil borings were sampled at the site. Up to 2,300 mg/kg DRO (20 feet bgs to east of tanks), and 0.30 mg/kg benzene (20 feet bgs at southeast of piping run). Six groundwater samples were collected with up to 56 mg/l DRO (near north piping run), and 19 ug/l benzene in the groundwater (north of tanks).	Robert Weimer
8/15/2003	Release Investigation	Release investigation workplan conditionally approved for the installation of additional monitoring wells to define the extent of the groundwater contamination.	Robert Weimer
9/23/2003	Leaking Underground Storage Tank Corrective Action Underway	Approved 2.26 cubic yards of contaminated soil to be thermally treated at ASR.	Robert Weimer
8/11/2004	Document, Report, or Work plan Review - other	June 5, 2004 groundwater sampling. Up to 3.2 mg/l DRO in groundwater. Contaminant concentrations increased in two of the monitoring wells.	Robert Weimer
12/6/2004	Document, Report, or Work plan Review - other	September 26, 2004 groundwater sampling. Up to 1.8 mg/l DRO in groundwater. Contaminant concentrations increased in two of the monitoring wells.	Robert Weimer
2/4/2005	Document, Report, or Work plan Review - other	January 10, 2005 groundwater monitoring event. All 4 monitoring wells were inaccessible due to snow and ice.	Robert Weimer
2/23/2005	Meeting or Teleconference Held	Meeting with RP's new consultant to discuss site. Need corrective action plan remaining soil contamination identified in 1995 and 2003. May also need to install additional monitoring wells to define the extent of the groundwater contamination at the site.	Robert Weimer
5/31/2005	Document, Report, or Work plan Review - other	March 24, 2005 groundwater sampling. Up to 1.1 mg/l DRO in groundwater. Contaminant concentrations were stable in the monitoring wells this monitoring event. Three of the monitoring wells were not accessible due to ice.	Robert Weimer
7/19/2005	Document, Report, or Work plan Review - other	May 17, 2005 groundwater sampling. Up to 3.9 mg/l DRO in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the northwest.	Robert Weimer
8/29/2005	Update or Other Action	Reviewed draft release investigation report and discussed with consultant.	Robert Weimer
9/12/2005	Update or Other Action	Reviewed and approved workplan for the installation of 2 additional monitoring wells to help define the extent of the soil and groundwater contamination at the site.	Robert Weimer
10/3/2005	Update or Other Action	Approved corrective action plan for 7 drums of contaminated soil to be thermally treated at ASR.	Robert Weimer
11/8/2005	Update or Other Action	Approved sampling to be conducted in November. Approved suspending sampling for GRO in all of the monitoring wells.	Robert Weimer
11/29/2005	Document, Report, or Work plan Review - other	September 25, 2005 groundwater sampling. Up to 1.2 mg/l DRO in groundwater. Contaminant concentrations decreased in the monitoring wells from the previous event. Groundwater flow direction is to the northwest. Depth to groundwater is 16 to 33 feet below ground surface.	Robert Weimer
12/2/2005	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of a drum of contaminated purge water.	Robert Weimer
1/23/2006	Document, Report, or Work plan Review - other	November 16, 2005 groundwater sampling. Up to 5.0 mg/l DRO in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the northwest. Depth to groundwater is 21 to 33 feet below ground surface.	Robert Weimer
1/23/2006	Site Characterization Report Approved	Two additional monitoring wells (MW-5 and MW-6) were installed on September of 2005. Up to 7,800 mg/kg DRO and 0.06 mg/kg benzene where in the soil at the MW-5 location.	Robert Weimer
1/23/2006	Update or Other Action	ADEC approves suspending the sampling of all monitoring wells (except MW-5) for BTEX. All 6 monitoring wells are to continue to be sampled for DRO.	Robert Weimer
9/25/2006	Document, Report, or Work plan Review - other	March 29, 2006 groundwater sampling. Up to 1.2 mg/l DRO in groundwater. Contaminant concentrations appear to be decreasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 22 to 34 feet below ground surface.	Robert Weimer
10/5/2006	Document, Report, or Work plan Review - other	May 17, 2006 groundwater sampling. Up to 0.55 mg/l DRO in groundwater. Contaminant concentrations appear to be decreasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 21 to 33 feet below ground surface.	Robert Weimer
11/1/2006	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
12/22/2006	Document, Report, or Work plan Review - other	September 26, 2006 groundwater sampling. Up to 1.5 mg/l DRO in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 20 to 33 feet below ground surface.	Robert Weimer
4/2/2007	Meeting or Teleconference Held	Meeting with Chevron to discuss this site. They are to continue with semi-annual monitoring and sampling.	Robert Weimer
10/2/2007	Document, Report, or Work plan Review - other	January 17, 2007 groundwater sampling. Non-detect (<1.19 mg/l) DRO in groundwater. Contaminant concentrations appear to be decreasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 22 to 34 feet below ground surface.	Robert Weimer
12/12/2007	Document, Report, or Work plan Review - other	March 29, 2007 groundwater sampling. Up to 2.3 mg/l DRO in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 31 to 34 feet below ground surface.	Robert Weimer
12/17/2007	Conceptual Site Model Submitted	Reviewed preliminary conceptual site model	Robert Weimer
12/20/2007	Document, Report, or Work plan Review - other	May 18, 2007 groundwater sampling. Up to 2.6 mg/l DRO in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 20.5 to 31.3 feet below ground surface.	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 plan to replace monitoring well MW-1, continue monitoring, and to evaluate if additional assessment is needed.	Robert Weimer
4/7/2008	Document, Report, or Work plan Review - other	July 10, 2007 groundwater sampling. Up to 7.7 mg/l DRO and non-detect (<0.001 mg/l) benzene in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 21.2 to 33.79 feet below ground surface.	Robert Weimer
4/17/2008	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
4/21/2008	Document, Report, or Work plan Review - other	ADEC approves workplan for the abandonment of monitoring well MW-1 and the installation of a replacement monitoring well near that location. The monitoring well is being abandoned due to insufficient water. The replacement monitoring well will have a longer and deeper screened interval.	Robert Weimer
5/5/2008	Document, Report, or Work plan Review - other	September 20, 2007 groundwater sampling. Up to 0.69 mg/l DRO and non-detect (<0.001 mg/l) benzene in groundwater. Results are biased low due to failure to keep the samples chilled. Contaminant concentrations appear to be decreasing in the monitoring wells. Groundwater flow direction is to the northwest. Depth to groundwater is 21.96 to 33.92 feet below ground surface.	Robert Weimer
8/5/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
9/8/2008	Document, Report, or Work plan Review - other	March 28, 2008 groundwater sampling. Up to 0.391 mg/l DRO and non-detect (<0.0005 mg/l) benzene in groundwater. Contaminant concentrations appear to be decreasing in the monitoring wells. Groundwater flow direction is to the northwest. Depth to groundwater is 22.21 to 33.85 feet below ground surface.	Robert Weimer
9/25/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
9/30/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of additional drums of contaminated purge water.	Robert Weimer
10/20/2008	Update or Other Action	ADEC approves reducing the monitoring of monitoring wells MW-1, MW-2, MW-3, MW-5, and MW-6 to semi-annual for DRO; monitoring well MW-5 to annual for BTEX; and suspending sampling of MW-4.	Robert Weimer
11/17/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
11/21/2008	Offsite Soil or Groundwater Disposal Approved	Review and approve treatment of two contaminated drill cuttings. The cuttings were generated in September 2008 during the installation of the replacement monitoring well MW-1R.	Robert Weimer
1/30/2009	Document, Report, or Work plan Review - other	June 9, 2008 groundwater sampling. Up to 0.32 mg/l DRO, non-detect (<0.01 mg/l) GRO, and non-detect (<0.001 mg/l) benzene in groundwater. Contaminant concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 21.00 to 33.08 feet below ground surface.	Robert Weimer
2/25/2009	Meeting or Teleconference Held	Meeting with Chevron and their consultants. Chevron to conduct and indoor air evaluation for this site. Chevron to do additional evaluation on the source of the contamination found in monitoring well MW-1R.	Robert Weimer
2/26/2009	Document, Report, or Work plan Review - other	September 15, 2008 and October 28, 2008 groundwater sampling. Up to 0.63 mg/l DRO, 0.01 mg/l GRO, and non-detect (<0.001 mg/l) benzene in groundwater. Contaminant concentrations increased in 4 of the 6 monitoring wells. Groundwater flow direction is to the northwest. Depth to groundwater is 30.55 to 33.90 feet below ground surface.	Robert Weimer
2/27/2009	Document, Report, or Work plan Review - other	On October 23, 2008 a replacement monitoring well was installed MW-1R, and monitoring well MW-1 was decommissioned. The decommissioned monitoring well was installed to 23.25 feet below ground surface (bgs) but historically contained insufficient groundwater for sampling. Soil samples were collected during the installation of the replacement monitoring well, up to 4.1 mg/kg benzene (at 21 feet bgs), 9.1 mg/kg GRO, and 52 mg/kg DRO in the soil samples collected. These results are biased low because an air rotary rig was used to drill the monitoring well. Perched groundwater was encountered at 19 feet bgs, with a clay layer at 20 to 21.5 feet bgs. The replacement monitoring well was screened from 25 to 40 feet bgs, and has static water at 30.55 feet bgs. This replacement monitoring well is sampling groundwater in the 2nd aquifer which the other site monitorings wells are sampling.	Robert Weimer
6/17/2009	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of one drum of contaminated purge water.	Robert Weimer
10/1/2009	Document, Report, or Work plan Review - other	May 6, 2009 groundwater sampling. Up to 1.5 mg/l DRO, and non-detect (<0.005 mg/l) benzene in groundwater. Contaminant concentrations increased in 2 of the 5 monitoring wells sampled. Groundwater flow direction is to the north by northwest. Depth to groundwater is 30.63 to 33.72 feet below ground surface.	Robert Weimer
1/29/2010	Document, Report, or Work plan Review - other	September 14, 2009 groundwater sampling. Up to 1.1 mg/l DRO, 0.010 mg/l GRO, and <0.005 mg/l benzene in groundwater. Contaminant concentrations increased in 2 of the 5 monitoring wells sampled. Groundwater flow direction is to the north by northwest. Depth to groundwater is 30.68 to 34.17 feet below ground surface.	Robert Weimer
3/11/2010	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 3/10/10. We discussed that there were documented releases at this site found in 1995 and 2003, Chevron will submit a workplan for collecting confirmation soil samples at those locations. 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
4/13/2010	Update or Other Action	During the April 2010 groundwater monitoring event HydraSleeve(TM) samplers will be used for VOC sampling at this site.	Robert Weimer
8/23/2010	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
8/27/2010	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
2/15/2011	Document, Report, or Work plan Review - other	April 21, 2010 groundwater sampling. Up to 1.1 mg/l DRO, 0.12 mg/l GRO, and non-detect (<0.005 mg/l) benzene in groundwater. Contaminant concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 30.30 to 33.04 feet below ground surface.	Robert Weimer
2/23/2011	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/23/11. We discussed that there were documented releases at this site found in 1995 and 2003, and 4.1 mg/kg benzene identified in 2008 at the site. Chevron will submit a workplan for collecting confirmation soil samples at the site to assess the current soil contamination levels and extent at the site so the site can be evaluated for Corrective Action Complete with ICs. The site will also be reviewed for reducing groundwater monitoring from semi-annual to annual.	Robert Weimer
3/2/2011	Document, Report, or Work plan Review - other	ADEC approves temporary storage of any purgewater generated in 2011 at the secure area at 1441 C Street.	Robert Weimer
4/8/2011	Update or Other Action	ADEC approves request for annual groundwater monitoring.	Robert Weimer
6/16/2011	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77980 1995 UST release.	Bill O'Connell
6/28/2011	Document, Report, or Work plan Review - other	July 22, 2010 groundwater sampling. Up to 0.8 mg/l DRO, non-detect (<0.01 mg/l GRO), and non-detect (<0.0005 mg/l) benzene in groundwater. Contaminant concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 30.50 to 33.23 feet below ground surface. Chevron's consultant recommends continued groundwater monitoring to evaluate site groundwater conditions.	Robert Weimer
9/1/2011	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77980 1995 UST release.	Robert Weimer
10/26/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
3/7/2012	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/28/12. Chevron's request for cleanup complete with IC's was not appoved. Chevron is conducting semi-annual groundwater monitoring of monitoring well MW-3. The site monitoring wells are not approved to be decommissioned. We discussed that there was high field reading soils left at the southern product piping that will need to be assessed and cleaned up when it becomes accessible in the future.	Robert Weimer
8/17/2012	Offsite Soil or Groundwater Disposal Approved	ADEC approves offsite treatment of contaminated purge water.	Robert Weimer
9/17/2012	Offsite Soil or Groundwater Disposal Approved	ADEC approves offsite treatment of contaminated purge water.	Robert Weimer
1/15/2013	Document, Report, or Work plan Review - other	August 3, 2011 groundwater sampling. Up to 1.7 mg/l DRO (MW-3, the highest concentrations since 2003), 0.014 mg/l GRO, and non-detect (<0.0005 mg/l) benzene in groundwater. Contaminant concentrations increased in 4 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 30.67 to 32.10 feet below ground surface. Chevron's consultant recommends continued groundwater monitoring to evaluate site groundwater conditions.	Robert Weimer
1/15/2013	Document, Report, or Work plan Review - other	May 30, 2012 groundwater sampling. Up to 1.6 mg/l DRO (MW-5, the highest concentrations since 2005), non-detect (<0.010 mg/l) GRO, and non-detect (<0.0005 mg/l) benzene in groundwater. Contaminant concentrations increased in 2 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 29.95 to 31.61 feet below ground surface.	Robert Weimer
1/29/2013	Document, Report, or Work plan Review - other	August 23, 2012 groundwater sampling. Up to 1.1 mg/l DRO, non-detect (<0.010 mg/l GRO), and non-detect (<0.0005 mg/l) benzene in groundwater. Contaminant concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 30.25 to 33.28 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring.	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. Chevron is going to submit a plan for the installation and sampling of at least 3 monitoring wells near (2, 3, 5) to assess the shallow groundwater contamination trends and migration. The shallow groundwater was encountered around 20 feet below ground surface, all existing monitoring wells are sampling the deeper groundwater at 30 to 33 feet below ground surface. The next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data. We discussed that all semi-annual monitoring events need to be at least 120 days apart.	Robert Weimer
3/26/2013	Update or Other Action	DEC conditionally approves the use of a portable activated carbon (gac) filter system for this site to treat water generated during groundwater monitoring. The storage of water at the site or the secure storage area at 1441 C Street is also approved.	Robert Weimer
1/15/2014	Document, Report, or Work plan Review - other	May 6, 2013 groundwater sampling. Up to 1.8 mg/l DRO, 0.013 mg/l GRO, and 0.00067 mg/l benzene in groundwater. The 1.8 mg/l DRO result was the highest concentration in MW-5 since 2005. Contaminant concentrations increased in 5 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 29.96 to 32.04 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The samples were collect by both no-purge (Hydrasleeve for volatiles and bailer for non-volatiles) and purge (bladder pump). The Hydrasleeve/bailer samples were collected from the top of water column. Since the sampling interval for the bladder pump was not documented its results are biased low and the no purge sampling may not be representative.	Robert Weimer
2/27/2014	Meeting or Teleconference Held	Meeting with Chevron and their consultants on February 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 need 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. We discussed that since the correct depth as required in the sampling work plan was not sampled the results are considered biased low and won’t be used for site closure evaluation or trend analysis. Chevron directed their consultant to document the sampling depth in future sampling events and to collected the water samples from as close as possible to the soil/water interface within the top foot in the monitoring wells as specified in the sampling work plan. The consultant will provide more information in their site reports in accordance with DEC’s 9/23/2009 Site Characterization Work Plan and Reporting Guidance for Investigation of Contaminated Sites.	Robert Weimer
5/6/2014	Document, Report, or Work plan Review - other	September 16, 2013 groundwater sampling. Up to 0.85 mg/l DRO, non-detect (<0.05 mg/l) GRO, and 0.00038 mg/l benzene in groundwater. Contaminant concentrations increased in 0 of the 5 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.09 to 32.54 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The samples were collected with a bladder pump after purging. Since the sampling interval for the bladder pump was not documented its results are considered biased low.	Robert Weimer
2/11/2015	Document, Report, or Work plan Review - other	April 30, 2014 groundwater sampling. Up to 0.79 mg/l DRO, non-detect (<0.05 mg/l) GRO, and non-detect (<0.00015 mg/l) benzene in groundwater. Contaminant concentrations increased in 0 of the 4 monitoring wells sampled. Monitoring well MW-3 could not be sampled due to ice in the well. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.27 to 31.39 feet below ground surface. The samples were collected with a bladder pump after purging. Since the sampling interval for the bladder pump was not near the soil/water interface (Up to 1.92 feet below the water surface in monitoring wells MW-1R and MW5) the results are considered biased low.	Robert Weimer
2/12/2015	Document, Report, or Work plan Review - other	October 1, 2014 groundwater sampling. Up to 1.0 mg/l DRO, non-detect (<0.05 mg/l) GRO, and 0.58 ug/l benzene in groundwater. Contaminant concentrations increased in 5 of the 5 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.20 to 32.92 feet below ground surface. The samples were collected with a bladder pump after purging. Since the sampling interval for the bladder pump was not near the soil/water interface in all of the monitoring wells (Up to 2.38 feet below the water surface in monitoring wells MW2) the results are considered biased low.	Robert Weimer
2/23/2015	Update or Other Action	As discussed with CRA and Chevron in the February 2014 meeting it is critical to have sampling data with good QA/QC to make decisions regarding monitoring frequency and possible site closure. We discussed that there were past problems with documenting the depth of sampling in the monitoring wells at this site and 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. In that meeting Chevron directed their consultant to document the sampling depth in future sampling events and to collected the water samples from as close as possible to the soil/water interface within the top foot in the monitoring wells as specified in the sampling work plan. Because of problems with not collecting samples from the as close as possible to the soil/water interface as required (for the 4/30/2014 and 10/1/2014 sampling events the pump intake was up to 2.38 feet below the soil/water interface), the request for a reduction of sampling frequency to an annual basis is not approved. Once we have a monitoring event where the intake for the bladder pump is within 1 foot of the soil/water interface at the time of the sampling in each monitoring well and no other QA/QC problems DEC can review this site for reduction to annual basis for those monitoring wells.	Robert Weimer
4/22/2015	Document, Report, or Work plan Review - other	DEC review of the 2015 Groundwater Monitoring and Sampling Work Plan for the Chevron Station 91252 site located at 11836 Old Glenn Highway. As discussed this morning and as discussed in previous meetings, it is critical to have sampling data with good QA/QC to make decisions regarding future monitoring frequency and possible site closure. For next monitoring event DEC requests that all of the site monitoring wells (MW-1R, MW-2, MW-3, MW-4, MW-5, and MW-6) be sampled and analyzed for BTEX, GRO, and DRO. Based on the results of that sampling we can evaluate reductions in groundwater sampling at this site.	Robert Weimer
4/13/2016	Document, Report, or Work plan Review - other	May 6, 2015 groundwater sampling. Up to 1.3 mg/l DRO, non-detect GRO and benzene in groundwater. Contaminant concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.50 to 33.56 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.	Robert Weimer
11/14/2016	Document, Report, or Work plan Review - other	October 20, 2015 groundwater sampling. Up to 2.0 mg/l DRO, 0.017 mg/l GRO and non-detect benzene in groundwater. Contaminant concentrations increased in 2 of the 6 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.25 to 33.24 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.	Robert Weimer
1/25/2017	Document, Report, or Work plan Review - other	May 19, 2016 groundwater sampling. Up to 1.6 mg/l DRO, 0.014 mg/l GRO and non-detect benzene in groundwater. Contaminant concentrations increased in 3 of the 5 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 31.20 to 33.69 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.	Robert Weimer
2/23/2017	Document, Report, or Work plan Review - other	September 28, 2016 groundwater sampling. Up to 1.6 mg/l DRO, 0.014 mg/l GRO and non-detect benzene in groundwater. Contaminant concentrations increased in 4 of the 5 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.36 to 33.56 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.	Robert Weimer
2/28/2017	Update or Other Action	DEC approves request to suspend, until further notice, BTEX (8021) and GRO sampling of the current site monitoring wells and DRO sampling in monitoring wells MW-1R, MW-4, and MW-6. For next monitoring event DEC requests that all of the site monitoring wells (MW-1R, MW-2, MW-3, MW-4, MW-5, and MW-6) be sampled and analyzed for full VOCs (8260) and PAH. DEC also request that monitoring wells MW-2, MW-3, and MW-5 be sampled for DRO. Based on the results of that sampling we can evaluate further reductions in groundwater sampling at this site.	Robert Weimer
10/30/2017	Document, Report, or Work plan Review - other	May 22, 2017 groundwater sampling. Up to 2.3 mg/l DRO and non-detect benzene in groundwater. Contaminant concentrations increased in 2 of the 3 monitoring wells sampled for DRO. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.33 to 32.94 feet below ground surface. Six monitoring wells were sampled for PAHs and full VOCs. All detected PAHs and VOCs were below current cleanup levels. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required. Naphthalene results were not reported in the 8260 analysis as required.	Robert Weimer
3/30/2018	Document, Report, or Work plan Review - other	October 16, 2017 groundwater sampling. Up to 1.8 mg/l DRO and non-detect benzene in groundwater. Contaminant concentrations increased in 0 of the 3 monitoring wells sampled for DRO. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.34 to 33.41 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.	Robert Weimer
6/21/2018	Document, Report, or Work plan Review - other	April 19, 2018 groundwater sampling. Up to 1.5 mg/l DRO in groundwater. Contaminant concentrations increased in 2 of the 3 monitoring wells sampled for DRO. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.27 to 32.72 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.	Robert Weimer
11/21/2018	Document, Report, or Work plan Review - other	September 4, 2018 groundwater sampling. Up to 3.4 mg/l DRO in groundwater. Contaminant concentratons increased in 2 of the 3 monitoring wells sampled for DRO. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.34 to 33.34 feet below ground surface. The samples were collected with a bailer after purging.	Robert Weimer
9/23/2019	Update or Other Action	ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also VOC sampling needs to include the full 8260 VOC list including naphthalene.	Robert Weimer
11/5/2019	Document, Report, or Work plan Review - other	Meeting with Chevron's consultant. They will provide a work plan for installing monitoring wells to assess the shallower aquifer at the site. This would include soil and quarterly groundwater samples in the areas near monitoring wells MW1R, MW2, MW3, and MW5. Soil and groundwater sampling would include full VOCs, PAH, GRO, and DRO analysis. DEC requested that site reports be submitted within 60 days of sampling, VOC analysis include naphthalene, and groundwater monitoring figure include diagram showing historic groundwater flow direction. DEC requested that the next groundwater monitoring event include analysis for full VOCs in monitoring wells MW2, MW3, and MW5. The mentioned that monitoring well MW3 has been damaged so it will need to be replaced.	Robert Weimer
1/7/2020	Document, Report, or Work plan Review - other	April 8, 2019 groundwater sampling. Up to 0.92 mg/l DRO. Contaminant concentrations increased in 0 of the 2 monitoring wells sampled for DRO. Monitoring well MW-3 was sampled because it was purged dry and did not recharge. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.27 to 32.72 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.	Robert Weimer
3/12/2020	Update or Other Action	ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Needs to include the requested full VOC (8260) analysis, including naphthalene in monitoring wells MW2, MW3, and MW5. ADEC is also requesting that all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions.	Robert Weimer
3/17/2020	Document, Report, or Work plan Review - other	DEC reviewed 2020 groundwater sampling plan and provided the following comments: For all future monitoring events please make sure that the field notes document the measurement of the pump intake that is within the top foot of the water column at the time of the sampling unless the top of the well screened interval is deeper, then in that case from the top foot of that screened interval. For all future monitoring events any monitoring well where BTEX or HVOC sampling is proposed it needs to be the full VOC (method 8260) list, including naphthalene. The field QC samples are per day of sampling at a site. For all future monitoring events all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. For all future monitoring events if a monitoring well is low yield and purges dry then a sample will still need to be collected that monitoring event once the monitoring well has recharged to approximately 80% of its pre-purge volume. If it has not returned to 80% of its pre-purged volume during that sampling day DEC requests that you return to the site early the next day to attempt to collect the water sample. DEC also requested full VOC for monitoring wells MW2, MW3, and MW5.	Robert Weimer
11/23/2020	Document, Report, or Work plan Review - other	October 2, 2020 groundwater sampling. Monitoring wells MW-2, MW-3 and MW-5 were sampled for DRO and VOCs. The following analytes were detected DRO (up to 1.46 mg/L), benzene (0.000291 mg/L), EDC (0.000733 mg/L). Duplicate sample was collected from MW-5. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.20 to 33.48 feet below ground surface. Sample was collected with a bladder pump after purging with the sampling interval near the soil/water interface.	Rebekah Reams
12/11/2020	Document, Report, or Work plan Review - other	April 1, 2020 groundwater sampling. Monitoring wells MW-2 and MW-5 were obstructed by ice and could not be sampled. MW-3 was sampled, DRO and VOCs were analyzed and no analytes were detected. The blind duplicate from well MW-3 was attempted but not collected due to slow well recharge. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.50 to 33.88 feet below ground surface. Sample was collected with a bladder pump after purging with the sampling interval near the soil/water interface.	Rebekah Reams
12/11/2020	Document, Report, or Work plan Review - other	September 9, 2019 groundwater sampling. Up to 1.7 mg/L DRO. Contaminant concentrations increased at 1 of the 2 monitoring wells sampled for DRO. Monitoring well MW-3 was not sampled because it was purged dry and did not recharge. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.51 to 33.97 feet below ground surface. Samples were collected with a bladder pump after purging with the sampling interval near the soil/water interface.	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
2/2/2021	Document, Report, or Work plan Review - other	DEC provided comments on the Second Semi-Annual Groundwater Monitoring Report submitted by Arcadis on November 23, 2020.	Rebekah Reams
2/2/2021	Workplan Requested	DEC provided a response to the Monitoring Well Technical Memorandum submitted by Arcadis on March 17, 2020 that addressed a request for the installation of shallow monitoring wells to evaluate hydrocarbon impacts within a perched aquifer believed to be present at the site. The DEC maintains that this data gap needs to be addressed, which can be completed through the installation of shallow monitoring wells or the advancement of additional soil borings at the site. Site work should include the evaluation of VOCs and PAHs, which have not been analyzed in previous soil samples collected at the site.	Rebekah Reams
5/13/2021	Document, Report, or Work plan Review - other	DEC provided comments on the Monitoring Well Installation and Soil Boring Work Plan submitted on April 13, 2021. This document outlines plans to install three monitoring wells and one soil boring to establish if a confined shallow aquifer is present at the site, to assess contaminant attenuation at locations with former cleanup level exceedances, and to analyze samples for Contaminants of Potential Concern (COPCs) that have not previously been assessed at the site.	Rebekah Reams
6/7/2021	Document, Report, or Work plan Review - other	April 6, 2021 groundwater sampling. Monitoring wells MW-3 and MW-5 were sampled for DRO and VOCs. Monitoring wells MW-2 and MW-6 were frozen at roughly 2 feet below top of casing and were not sampled. Groundwater flow direction was to the northwest. Depth to groundwater was 30.35 to 33.99 feet below ground surface.	Rebekah Reams
7/28/2021	Site Characterization Workplan Approved	DEC provided conditional approval for the Revised Monitoring Well Installation and Soil Boring Work Plan. This document outlines plans to advance soil borings to confirm contaminant concentrations near former sample location MW-5 and DI1A-S2 and to evaluate whether a confined shallow aquifer is present at the site by installing and sampling three shallow monitoring wells.	Rebekah Reams
10/29/2021	Document, Report, or Work plan Review - other	August 25, 2021 groundwater sampling. Monitoring wells MW-2, MW-3 and MW-5 were sampled for DRO and VOCs. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.16 to 33.38 feet below ground surface.	Rebekah Reams
12/10/2021	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77980 1995 UST release.	Rebekah Reams
1/18/2022	Document, Report, or Work plan Review - other	Subsurface soil investigation was completed on September 29th through October 1st, 2021 to determine whether groundwater and soil impacts are present within a potential perched aquifer, to confirm current contaminant concentration, and to evaluate additional constituents of potential concern at the site. Monitoring well MW-7 through MW-9 were planned to be installed to investigation whether a perched aquifer is present at the site at soil borings SB-8 and SB-9 were planned to confirm former exceedances present near MW-5 and DI1A-S2, respectively. Due to refusal, SB-9 and MW-7 were not able to be advanced. Soil samples were analyzed for GRO, DRO, VOC, PAHs, and total lead. All analytical soil sample results were below cleanup levels.	Rebekah Reams
4/8/2022	Offsite Soil or Groundwater Disposal Approved	DEC approved transport of 0.8 cubic yards of soil and 130 gallons of water generated during fall 2021 site investigations.	Rebekah Reams
6/9/2022	Document, Report, or Work plan Review - other	March 30, 2022 groundwater sampling. Monitoring wells MW-2 and MW-5 were sampled for DRO and VOCs. All analytes were not detected or were detected below cleanup levels. The well casings of MW-1R and MW-3 was frozen. MW-8 was not located due to ice and snow, and MW-9 was dry. Groundwater flow direction was to the north by northwest. Depth to groundwater was 31.00 to 33.15 feet below ground surface.	Rebekah Reams
9/29/2022	Document, Report, or Work plan Review - other	ADEC provided comments on the Treatment of Purge Water Utilizing Granular Activated Carbon (GAC) at Chevron Environmental Management Company Sites which includes standard operating procedures and breakthrough estimates proposed for use at this site.	Rebekah Reams
12/23/2022	Offsite Soil or Groundwater Disposal Approved	DEC approved transport of one 55-gallon drum of purge water for offsite disposal	Rebekah Reams
12/23/2022	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, and recommends next steps for the site.	Rebekah Reams
3/3/2023	Long Term Monitoring Workplan or Report Review	ADEC approved the Groundwater Sampling Reduction Request Work Plan Addendum for this site. Future groundwater monitoring under this approved addendum will include quarterly monitoring at wells MW-2 through MW-6, MW-8, and MW-9. Samples will be analyzed for DRO, BTEX, EDB, EDC, PAHs, and lead.	Rebekah Reams

Action Date

Action

Description

DEC Staff

11/17/1995

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 77980 Site added to database.

Former Staff

11/17/1995

Site Added to Database

Former Staff

1/23/1996

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

LUST corrective action underway.

Former Staff

1/23/1996

Underground Storage Tank Site Characterization or Assessment

Site assessment conducted during the underground storage tank system removal. Three gasoline tanks and their piping were removed and replaced with new tanks and piping. Sampling conducted between August 29, 1995 and September 2, 1995. 0.72 mg/kg benzene and 1,100 mg/kg GRO at 10 feet below ground surface at the western dispenser.

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 ADEC & Chevron reps to review AK sites and set goals for 2001.

Linda Nuechterlein

3/9/2003

Site Characterization Report Approved

In March 2003 seven soil borings were sampled at the site. Up to 2,300 mg/kg DRO (20 feet bgs to east of tanks), and 0.30 mg/kg benzene (20 feet bgs at southeast of piping run). Six groundwater samples were collected with up to 56 mg/l DRO (near north piping run), and 19 ug/l benzene in the groundwater (north of tanks).

Robert Weimer

8/15/2003

Release Investigation

Release investigation workplan conditionally approved for the installation of additional monitoring wells to define the extent of the groundwater contamination.

Robert Weimer

9/23/2003

Leaking Underground Storage Tank Corrective Action Underway

Approved 2.26 cubic yards of contaminated soil to be thermally treated at ASR.

Robert Weimer

8/11/2004

Document, Report, or Work plan Review - other

June 5, 2004 groundwater sampling. Up to 3.2 mg/l DRO in groundwater. Contaminant concentrations increased in two of the monitoring wells.

Robert Weimer

12/6/2004

Document, Report, or Work plan Review - other

September 26, 2004 groundwater sampling. Up to 1.8 mg/l DRO in groundwater. Contaminant concentrations increased in two of the monitoring wells.

Robert Weimer

2/4/2005

Document, Report, or Work plan Review - other

January 10, 2005 groundwater monitoring event. All 4 monitoring wells were inaccessible due to snow and ice.

Robert Weimer

2/23/2005

Meeting or Teleconference Held

Meeting with RP's new consultant to discuss site. Need corrective action plan remaining soil contamination identified in 1995 and 2003. May also need to install additional monitoring wells to define the extent of the groundwater contamination at the site.

Robert Weimer

5/31/2005

Document, Report, or Work plan Review - other

March 24, 2005 groundwater sampling. Up to 1.1 mg/l DRO in groundwater. Contaminant concentrations were stable in the monitoring wells this monitoring event. Three of the monitoring wells were not accessible due to ice.

Robert Weimer

7/19/2005

Document, Report, or Work plan Review - other

May 17, 2005 groundwater sampling. Up to 3.9 mg/l DRO in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the northwest.

Robert Weimer

8/29/2005

Update or Other Action

Reviewed draft release investigation report and discussed with consultant.

Robert Weimer

9/12/2005

Update or Other Action

Reviewed and approved workplan for the installation of 2 additional monitoring wells to help define the extent of the soil and groundwater contamination at the site.

Robert Weimer

10/3/2005

Update or Other Action

Approved corrective action plan for 7 drums of contaminated soil to be thermally treated at ASR.

Robert Weimer

11/8/2005

Update or Other Action

Approved sampling to be conducted in November. Approved suspending sampling for GRO in all of the monitoring wells.

Robert Weimer

11/29/2005

Document, Report, or Work plan Review - other

September 25, 2005 groundwater sampling. Up to 1.2 mg/l DRO in groundwater. Contaminant concentrations decreased in the monitoring wells from the previous event. Groundwater flow direction is to the northwest. Depth to groundwater is 16 to 33 feet below ground surface.

Robert Weimer

12/2/2005

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of a drum of contaminated purge water.

Robert Weimer

1/23/2006

Document, Report, or Work plan Review - other

November 16, 2005 groundwater sampling. Up to 5.0 mg/l DRO in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the northwest. Depth to groundwater is 21 to 33 feet below ground surface.

Robert Weimer

1/23/2006

Site Characterization Report Approved

Two additional monitoring wells (MW-5 and MW-6) were installed on September of 2005. Up to 7,800 mg/kg DRO and 0.06 mg/kg benzene where in the soil at the MW-5 location.

Robert Weimer

1/23/2006

Update or Other Action

ADEC approves suspending the sampling of all monitoring wells (except MW-5) for BTEX. All 6 monitoring wells are to continue to be sampled for DRO.

Robert Weimer

9/25/2006

Document, Report, or Work plan Review - other

March 29, 2006 groundwater sampling. Up to 1.2 mg/l DRO in groundwater. Contaminant concentrations appear to be decreasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 22 to 34 feet below ground surface.

Robert Weimer

10/5/2006

Document, Report, or Work plan Review - other

May 17, 2006 groundwater sampling. Up to 0.55 mg/l DRO in groundwater. Contaminant concentrations appear to be decreasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 21 to 33 feet below ground surface.

Robert Weimer

11/1/2006

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

12/22/2006

Document, Report, or Work plan Review - other

September 26, 2006 groundwater sampling. Up to 1.5 mg/l DRO in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 20 to 33 feet below ground surface.

Robert Weimer

4/2/2007

Meeting or Teleconference Held

Meeting with Chevron to discuss this site. They are to continue with semi-annual monitoring and sampling.

Robert Weimer

10/2/2007

Document, Report, or Work plan Review - other

January 17, 2007 groundwater sampling. Non-detect (<1.19 mg/l) DRO in groundwater. Contaminant concentrations appear to be decreasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 22 to 34 feet below ground surface.

Robert Weimer

12/12/2007

Document, Report, or Work plan Review - other

March 29, 2007 groundwater sampling. Up to 2.3 mg/l DRO in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 31 to 34 feet below ground surface.

Robert Weimer

12/17/2007

Conceptual Site Model Submitted

Reviewed preliminary conceptual site model

Robert Weimer

12/20/2007

Document, Report, or Work plan Review - other

May 18, 2007 groundwater sampling. Up to 2.6 mg/l DRO in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 20.5 to 31.3 feet below ground surface.

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 plan to replace monitoring well MW-1, continue monitoring, and to evaluate if additional assessment is needed.

Robert Weimer

4/7/2008

Document, Report, or Work plan Review - other

July 10, 2007 groundwater sampling. Up to 7.7 mg/l DRO and non-detect (<0.001 mg/l) benzene in groundwater. Contaminant concentrations appear to be increasing in the monitoring wells. Groundwater flow direction is to the north by northwest. Depth to groundwater is 21.2 to 33.79 feet below ground surface.

Robert Weimer

4/17/2008

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

4/21/2008

Document, Report, or Work plan Review - other

ADEC approves workplan for the abandonment of monitoring well MW-1 and the installation of a replacement monitoring well near that location. The monitoring well is being abandoned due to insufficient water. The replacement monitoring well will have a longer and deeper screened interval.

Robert Weimer

5/5/2008

Document, Report, or Work plan Review - other

September 20, 2007 groundwater sampling. Up to 0.69 mg/l DRO and non-detect (<0.001 mg/l) benzene in groundwater. Results are biased low due to failure to keep the samples chilled. Contaminant concentrations appear to be decreasing in the monitoring wells. Groundwater flow direction is to the northwest. Depth to groundwater is 21.96 to 33.92 feet below ground surface.

Robert Weimer

8/5/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

9/8/2008

Document, Report, or Work plan Review - other

March 28, 2008 groundwater sampling. Up to 0.391 mg/l DRO and non-detect (<0.0005 mg/l) benzene in groundwater. Contaminant concentrations appear to be decreasing in the monitoring wells. Groundwater flow direction is to the northwest. Depth to groundwater is 22.21 to 33.85 feet below ground surface.

Robert Weimer

9/25/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

9/30/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of additional drums of contaminated purge water.

Robert Weimer

10/20/2008

Update or Other Action

ADEC approves reducing the monitoring of monitoring wells MW-1, MW-2, MW-3, MW-5, and MW-6 to semi-annual for DRO; monitoring well MW-5 to annual for BTEX; and suspending sampling of MW-4.

Robert Weimer

11/17/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

11/21/2008

Offsite Soil or Groundwater Disposal Approved

Review and approve treatment of two contaminated drill cuttings. The cuttings were generated in September 2008 during the installation of the replacement monitoring well MW-1R.

Robert Weimer

1/30/2009

Document, Report, or Work plan Review - other

June 9, 2008 groundwater sampling. Up to 0.32 mg/l DRO, non-detect (<0.01 mg/l) GRO, and non-detect (<0.001 mg/l) benzene in groundwater. Contaminant concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 21.00 to 33.08 feet below ground surface.

Robert Weimer

2/25/2009

Meeting or Teleconference Held

Meeting with Chevron and their consultants. Chevron to conduct and indoor air evaluation for this site. Chevron to do additional evaluation on the source of the contamination found in monitoring well MW-1R.

Robert Weimer

2/26/2009

Document, Report, or Work plan Review - other

September 15, 2008 and October 28, 2008 groundwater sampling. Up to 0.63 mg/l DRO, 0.01 mg/l GRO, and non-detect (<0.001 mg/l) benzene in groundwater. Contaminant concentrations increased in 4 of the 6 monitoring wells. Groundwater flow direction is to the northwest. Depth to groundwater is 30.55 to 33.90 feet below ground surface.

Robert Weimer

2/27/2009

Document, Report, or Work plan Review - other

On October 23, 2008 a replacement monitoring well was installed MW-1R, and monitoring well MW-1 was decommissioned. The decommissioned monitoring well was installed to 23.25 feet below ground surface (bgs) but historically contained insufficient groundwater for sampling. Soil samples were collected during the installation of the replacement monitoring well, up to 4.1 mg/kg benzene (at 21 feet bgs), 9.1 mg/kg GRO, and 52 mg/kg DRO in the soil samples collected. These results are biased low because an air rotary rig was used to drill the monitoring well. Perched groundwater was encountered at 19 feet bgs, with a clay layer at 20 to 21.5 feet bgs. The replacement monitoring well was screened from 25 to 40 feet bgs, and has static water at 30.55 feet bgs. This replacement monitoring well is sampling groundwater in the 2nd aquifer which the other site monitorings wells are sampling.

Robert Weimer

6/17/2009

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of one drum of contaminated purge water.

Robert Weimer

10/1/2009

Document, Report, or Work plan Review - other

May 6, 2009 groundwater sampling. Up to 1.5 mg/l DRO, and non-detect (<0.005 mg/l) benzene in groundwater. Contaminant concentrations increased in 2 of the 5 monitoring wells sampled. Groundwater flow direction is to the north by northwest. Depth to groundwater is 30.63 to 33.72 feet below ground surface.

Robert Weimer

1/29/2010

Document, Report, or Work plan Review - other

September 14, 2009 groundwater sampling. Up to 1.1 mg/l DRO, 0.010 mg/l GRO, and <0.005 mg/l benzene in groundwater. Contaminant concentrations increased in 2 of the 5 monitoring wells sampled. Groundwater flow direction is to the north by northwest. Depth to groundwater is 30.68 to 34.17 feet below ground surface.

Robert Weimer

3/11/2010

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 3/10/10. We discussed that there were documented releases at this site found in 1995 and 2003, Chevron will submit a workplan for collecting confirmation soil samples at those locations. 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

4/13/2010

Update or Other Action

During the April 2010 groundwater monitoring event HydraSleeve(TM) samplers will be used for VOC sampling at this site.

Robert Weimer

8/23/2010

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

8/27/2010

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

2/15/2011

Document, Report, or Work plan Review - other

April 21, 2010 groundwater sampling. Up to 1.1 mg/l DRO, 0.12 mg/l GRO, and non-detect (<0.005 mg/l) benzene in groundwater. Contaminant concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 30.30 to 33.04 feet below ground surface.

Robert Weimer

2/23/2011

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/23/11. We discussed that there were documented releases at this site found in 1995 and 2003, and 4.1 mg/kg benzene identified in 2008 at the site. Chevron will submit a workplan for collecting confirmation soil samples at the site to assess the current soil contamination levels and extent at the site so the site can be evaluated for Corrective Action Complete with ICs. The site will also be reviewed for reducing groundwater monitoring from semi-annual to annual.

Robert Weimer

3/2/2011

Document, Report, or Work plan Review - other

ADEC approves temporary storage of any purgewater generated in 2011 at the secure area at 1441 C Street.

Robert Weimer

4/8/2011

Update or Other Action

ADEC approves request for annual groundwater monitoring.

Robert Weimer

6/16/2011

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77980 1995 UST release.

Bill O'Connell

6/28/2011

Document, Report, or Work plan Review - other

July 22, 2010 groundwater sampling. Up to 0.8 mg/l DRO, non-detect (<0.01 mg/l GRO), and non-detect (<0.0005 mg/l) benzene in groundwater. Contaminant concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 30.50 to 33.23 feet below ground surface. Chevron's consultant recommends continued groundwater monitoring to evaluate site groundwater conditions.

Robert Weimer

9/1/2011

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77980 1995 UST release.

Robert Weimer

10/26/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

3/7/2012

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/28/12. Chevron's request for cleanup complete with IC's was not appoved. Chevron is conducting semi-annual groundwater monitoring of monitoring well MW-3. The site monitoring wells are not approved to be decommissioned. We discussed that there was high field reading soils left at the southern product piping that will need to be assessed and cleaned up when it becomes accessible in the future.

Robert Weimer

8/17/2012

Offsite Soil or Groundwater Disposal Approved

ADEC approves offsite treatment of contaminated purge water.

Robert Weimer

9/17/2012

Offsite Soil or Groundwater Disposal Approved

ADEC approves offsite treatment of contaminated purge water.

Robert Weimer

1/15/2013

Document, Report, or Work plan Review - other

August 3, 2011 groundwater sampling. Up to 1.7 mg/l DRO (MW-3, the highest concentrations since 2003), 0.014 mg/l GRO, and non-detect (<0.0005 mg/l) benzene in groundwater. Contaminant concentrations increased in 4 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 30.67 to 32.10 feet below ground surface. Chevron's consultant recommends continued groundwater monitoring to evaluate site groundwater conditions.

Robert Weimer

1/15/2013

Document, Report, or Work plan Review - other

May 30, 2012 groundwater sampling. Up to 1.6 mg/l DRO (MW-5, the highest concentrations since 2005), non-detect (<0.010 mg/l) GRO, and non-detect (<0.0005 mg/l) benzene in groundwater. Contaminant concentrations increased in 2 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 29.95 to 31.61 feet below ground surface.

Robert Weimer

1/29/2013

Document, Report, or Work plan Review - other

August 23, 2012 groundwater sampling. Up to 1.1 mg/l DRO, non-detect (<0.010 mg/l GRO), and non-detect (<0.0005 mg/l) benzene in groundwater. Contaminant concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 30.25 to 33.28 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring.

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. Chevron is going to submit a plan for the installation and sampling of at least 3 monitoring wells near (2, 3, 5) to assess the shallow groundwater contamination trends and migration. The shallow groundwater was encountered around 20 feet below ground surface, all existing monitoring wells are sampling the deeper groundwater at 30 to 33 feet below ground surface. The next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data. We discussed that all semi-annual monitoring events need to be at least 120 days apart.

Robert Weimer

3/26/2013

Update or Other Action

DEC conditionally approves the use of a portable activated carbon (gac) filter system for this site to treat water generated during groundwater monitoring. The storage of water at the site or the secure storage area at 1441 C Street is also approved.

Robert Weimer

1/15/2014

Document, Report, or Work plan Review - other

May 6, 2013 groundwater sampling. Up to 1.8 mg/l DRO, 0.013 mg/l GRO, and 0.00067 mg/l benzene in groundwater. The 1.8 mg/l DRO result was the highest concentration in MW-5 since 2005. Contaminant concentrations increased in 5 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 29.96 to 32.04 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The samples were collect by both no-purge (Hydrasleeve for volatiles and bailer for non-volatiles) and purge (bladder pump). The Hydrasleeve/bailer samples were collected from the top of water column. Since the sampling interval for the bladder pump was not documented its results are biased low and the no purge sampling may not be representative.

Robert Weimer

2/27/2014

Meeting or Teleconference Held

Meeting with Chevron and their consultants on February 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 need 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. We discussed that since the correct depth as required in the sampling work plan was not sampled the results are considered biased low and won’t be used for site closure evaluation or trend analysis. Chevron directed their consultant to document the sampling depth in future sampling events and to collected the water samples from as close as possible to the soil/water interface within the top foot in the monitoring wells as specified in the sampling work plan. The consultant will provide more information in their site reports in accordance with DEC’s 9/23/2009 Site Characterization Work Plan and Reporting Guidance for Investigation of Contaminated Sites.

Robert Weimer

5/6/2014

Document, Report, or Work plan Review - other

September 16, 2013 groundwater sampling. Up to 0.85 mg/l DRO, non-detect (<0.05 mg/l) GRO, and 0.00038 mg/l benzene in groundwater. Contaminant concentrations increased in 0 of the 5 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.09 to 32.54 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The samples were collected with a bladder pump after purging. Since the sampling interval for the bladder pump was not documented its results are considered biased low.

Robert Weimer

2/11/2015

Document, Report, or Work plan Review - other

April 30, 2014 groundwater sampling. Up to 0.79 mg/l DRO, non-detect (<0.05 mg/l) GRO, and non-detect (<0.00015 mg/l) benzene in groundwater. Contaminant concentrations increased in 0 of the 4 monitoring wells sampled. Monitoring well MW-3 could not be sampled due to ice in the well. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.27 to 31.39 feet below ground surface. The samples were collected with a bladder pump after purging. Since the sampling interval for the bladder pump was not near the soil/water interface (Up to 1.92 feet below the water surface in monitoring wells MW-1R and MW5) the results are considered biased low.

Robert Weimer

2/12/2015

Document, Report, or Work plan Review - other

October 1, 2014 groundwater sampling. Up to 1.0 mg/l DRO, non-detect (<0.05 mg/l) GRO, and 0.58 ug/l benzene in groundwater. Contaminant concentrations increased in 5 of the 5 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.20 to 32.92 feet below ground surface. The samples were collected with a bladder pump after purging. Since the sampling interval for the bladder pump was not near the soil/water interface in all of the monitoring wells (Up to 2.38 feet below the water surface in monitoring wells MW2) the results are considered biased low.

Robert Weimer

2/23/2015

Update or Other Action

As discussed with CRA and Chevron in the February 2014 meeting it is critical to have sampling data with good QA/QC to make decisions regarding monitoring frequency and possible site closure. We discussed that there were past problems with documenting the depth of sampling in the monitoring wells at this site and 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. In that meeting Chevron directed their consultant to document the sampling depth in future sampling events and to collected the water samples from as close as possible to the soil/water interface within the top foot in the monitoring wells as specified in the sampling work plan. Because of problems with not collecting samples from the as close as possible to the soil/water interface as required (for the 4/30/2014 and 10/1/2014 sampling events the pump intake was up to 2.38 feet below the soil/water interface), the request for a reduction of sampling frequency to an annual basis is not approved. Once we have a monitoring event where the intake for the bladder pump is within 1 foot of the soil/water interface at the time of the sampling in each monitoring well and no other QA/QC problems DEC can review this site for reduction to annual basis for those monitoring wells.

Robert Weimer

4/22/2015

Document, Report, or Work plan Review - other

DEC review of the 2015 Groundwater Monitoring and Sampling Work Plan for the Chevron Station 91252 site located at 11836 Old Glenn Highway. As discussed this morning and as discussed in previous meetings, it is critical to have sampling data with good QA/QC to make decisions regarding future monitoring frequency and possible site closure. For next monitoring event DEC requests that all of the site monitoring wells (MW-1R, MW-2, MW-3, MW-4, MW-5, and MW-6) be sampled and analyzed for BTEX, GRO, and DRO. Based on the results of that sampling we can evaluate reductions in groundwater sampling at this site.

Robert Weimer

4/13/2016

Document, Report, or Work plan Review - other

May 6, 2015 groundwater sampling. Up to 1.3 mg/l DRO, non-detect GRO and benzene in groundwater. Contaminant concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.50 to 33.56 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.

Robert Weimer

11/14/2016

Document, Report, or Work plan Review - other

October 20, 2015 groundwater sampling. Up to 2.0 mg/l DRO, 0.017 mg/l GRO and non-detect benzene in groundwater. Contaminant concentrations increased in 2 of the 6 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.25 to 33.24 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.

Robert Weimer

1/25/2017

Document, Report, or Work plan Review - other

May 19, 2016 groundwater sampling. Up to 1.6 mg/l DRO, 0.014 mg/l GRO and non-detect benzene in groundwater. Contaminant concentrations increased in 3 of the 5 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 31.20 to 33.69 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.

Robert Weimer

2/23/2017

Document, Report, or Work plan Review - other

September 28, 2016 groundwater sampling. Up to 1.6 mg/l DRO, 0.014 mg/l GRO and non-detect benzene in groundwater. Contaminant concentrations increased in 4 of the 5 monitoring wells sampled. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.36 to 33.56 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.

Robert Weimer

2/28/2017

Update or Other Action

DEC approves request to suspend, until further notice, BTEX (8021) and GRO sampling of the current site monitoring wells and DRO sampling in monitoring wells MW-1R, MW-4, and MW-6. For next monitoring event DEC requests that all of the site monitoring wells (MW-1R, MW-2, MW-3, MW-4, MW-5, and MW-6) be sampled and analyzed for full VOCs (8260) and PAH. DEC also request that monitoring wells MW-2, MW-3, and MW-5 be sampled for DRO. Based on the results of that sampling we can evaluate further reductions in groundwater sampling at this site.

Robert Weimer

10/30/2017

Document, Report, or Work plan Review - other

May 22, 2017 groundwater sampling. Up to 2.3 mg/l DRO and non-detect benzene in groundwater. Contaminant concentrations increased in 2 of the 3 monitoring wells sampled for DRO. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.33 to 32.94 feet below ground surface. Six monitoring wells were sampled for PAHs and full VOCs. All detected PAHs and VOCs were below current cleanup levels. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required. Naphthalene results were not reported in the 8260 analysis as required.

Robert Weimer

3/30/2018

Document, Report, or Work plan Review - other

October 16, 2017 groundwater sampling. Up to 1.8 mg/l DRO and non-detect benzene in groundwater. Contaminant concentrations increased in 0 of the 3 monitoring wells sampled for DRO. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.34 to 33.41 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.

Robert Weimer

6/21/2018

Document, Report, or Work plan Review - other

April 19, 2018 groundwater sampling. Up to 1.5 mg/l DRO in groundwater. Contaminant concentrations increased in 2 of the 3 monitoring wells sampled for DRO. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.27 to 32.72 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.

Robert Weimer

11/21/2018

Document, Report, or Work plan Review - other

September 4, 2018 groundwater sampling. Up to 3.4 mg/l DRO in groundwater. Contaminant concentratons increased in 2 of the 3 monitoring wells sampled for DRO. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.34 to 33.34 feet below ground surface. The samples were collected with a bailer after purging.

Robert Weimer

9/23/2019

Update or Other Action

Robert Weimer

11/5/2019

Document, Report, or Work plan Review - other

Meeting with Chevron's consultant. They will provide a work plan for installing monitoring wells to assess the shallower aquifer at the site. This would include soil and quarterly groundwater samples in the areas near monitoring wells MW1R, MW2, MW3, and MW5. Soil and groundwater sampling would include full VOCs, PAH, GRO, and DRO analysis. DEC requested that site reports be submitted within 60 days of sampling, VOC analysis include naphthalene, and groundwater monitoring figure include diagram showing historic groundwater flow direction. DEC requested that the next groundwater monitoring event include analysis for full VOCs in monitoring wells MW2, MW3, and MW5. The mentioned that monitoring well MW3 has been damaged so it will need to be replaced.

Robert Weimer

1/7/2020

Document, Report, or Work plan Review - other

April 8, 2019 groundwater sampling. Up to 0.92 mg/l DRO. Contaminant concentrations increased in 0 of the 2 monitoring wells sampled for DRO. Monitoring well MW-3 was sampled because it was purged dry and did not recharge. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.27 to 32.72 feet below ground surface. The samples were collected with a bladder pump after purging. The sampling interval for the bladder pump was near the soil/water interface as required.

Robert Weimer

3/12/2020

Update or Other Action

ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Needs to include the requested full VOC (8260) analysis, including naphthalene in monitoring wells MW2, MW3, and MW5. ADEC is also requesting that all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions.

Robert Weimer

3/17/2020

Document, Report, or Work plan Review - other

DEC reviewed 2020 groundwater sampling plan and provided the following comments: For all future monitoring events please make sure that the field notes document the measurement of the pump intake that is within the top foot of the water column at the time of the sampling unless the top of the well screened interval is deeper, then in that case from the top foot of that screened interval. For all future monitoring events any monitoring well where BTEX or HVOC sampling is proposed it needs to be the full VOC (method 8260) list, including naphthalene. The field QC samples are per day of sampling at a site. For all future monitoring events all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. For all future monitoring events if a monitoring well is low yield and purges dry then a sample will still need to be collected that monitoring event once the monitoring well has recharged to approximately 80% of its pre-purge volume. If it has not returned to 80% of its pre-purged volume during that sampling day DEC requests that you return to the site early the next day to attempt to collect the water sample. DEC also requested full VOC for monitoring wells MW2, MW3, and MW5.

Robert Weimer

11/23/2020

Document, Report, or Work plan Review - other

October 2, 2020 groundwater sampling. Monitoring wells MW-2, MW-3 and MW-5 were sampled for DRO and VOCs. The following analytes were detected DRO (up to 1.46 mg/L), benzene (0.000291 mg/L), EDC (0.000733 mg/L). Duplicate sample was collected from MW-5. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.20 to 33.48 feet below ground surface. Sample was collected with a bladder pump after purging with the sampling interval near the soil/water interface.

Rebekah Reams

12/11/2020

Document, Report, or Work plan Review - other

April 1, 2020 groundwater sampling. Monitoring wells MW-2 and MW-5 were obstructed by ice and could not be sampled. MW-3 was sampled, DRO and VOCs were analyzed and no analytes were detected. The blind duplicate from well MW-3 was attempted but not collected due to slow well recharge. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.50 to 33.88 feet below ground surface. Sample was collected with a bladder pump after purging with the sampling interval near the soil/water interface.

Rebekah Reams

12/11/2020

Document, Report, or Work plan Review - other

September 9, 2019 groundwater sampling. Up to 1.7 mg/L DRO. Contaminant concentrations increased at 1 of the 2 monitoring wells sampled for DRO. Monitoring well MW-3 was not sampled because it was purged dry and did not recharge. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.51 to 33.97 feet below ground surface. Samples were collected with a bladder pump after purging with the sampling interval near the soil/water interface.

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

2/2/2021

Document, Report, or Work plan Review - other

DEC provided comments on the Second Semi-Annual Groundwater Monitoring Report submitted by Arcadis on November 23, 2020.

Rebekah Reams

2/2/2021

Workplan Requested

DEC provided a response to the Monitoring Well Technical Memorandum submitted by Arcadis on March 17, 2020 that addressed a request for the installation of shallow monitoring wells to evaluate hydrocarbon impacts within a perched aquifer believed to be present at the site. The DEC maintains that this data gap needs to be addressed, which can be completed through the installation of shallow monitoring wells or the advancement of additional soil borings at the site. Site work should include the evaluation of VOCs and PAHs, which have not been analyzed in previous soil samples collected at the site.

Rebekah Reams

5/13/2021

Document, Report, or Work plan Review - other

DEC provided comments on the Monitoring Well Installation and Soil Boring Work Plan submitted on April 13, 2021. This document outlines plans to install three monitoring wells and one soil boring to establish if a confined shallow aquifer is present at the site, to assess contaminant attenuation at locations with former cleanup level exceedances, and to analyze samples for Contaminants of Potential Concern (COPCs) that have not previously been assessed at the site.

Rebekah Reams

6/7/2021

Document, Report, or Work plan Review - other

April 6, 2021 groundwater sampling. Monitoring wells MW-3 and MW-5 were sampled for DRO and VOCs. Monitoring wells MW-2 and MW-6 were frozen at roughly 2 feet below top of casing and were not sampled. Groundwater flow direction was to the northwest. Depth to groundwater was 30.35 to 33.99 feet below ground surface.

Rebekah Reams

7/28/2021

Site Characterization Workplan Approved

DEC provided conditional approval for the Revised Monitoring Well Installation and Soil Boring Work Plan. This document outlines plans to advance soil borings to confirm contaminant concentrations near former sample location MW-5 and DI1A-S2 and to evaluate whether a confined shallow aquifer is present at the site by installing and sampling three shallow monitoring wells.

Rebekah Reams

10/29/2021

Document, Report, or Work plan Review - other

August 25, 2021 groundwater sampling. Monitoring wells MW-2, MW-3 and MW-5 were sampled for DRO and VOCs. Groundwater flow direction was to the north by northwest. Depth to groundwater was 30.16 to 33.38 feet below ground surface.

Rebekah Reams

12/10/2021

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77980 1995 UST release.

Rebekah Reams

1/18/2022

Document, Report, or Work plan Review - other

Subsurface soil investigation was completed on September 29th through October 1st, 2021 to determine whether groundwater and soil impacts are present within a potential perched aquifer, to confirm current contaminant concentration, and to evaluate additional constituents of potential concern at the site. Monitoring well MW-7 through MW-9 were planned to be installed to investigation whether a perched aquifer is present at the site at soil borings SB-8 and SB-9 were planned to confirm former exceedances present near MW-5 and DI1A-S2, respectively. Due to refusal, SB-9 and MW-7 were not able to be advanced. Soil samples were analyzed for GRO, DRO, VOC, PAHs, and total lead. All analytical soil sample results were below cleanup levels.

Rebekah Reams

4/8/2022

Offsite Soil or Groundwater Disposal Approved

DEC approved transport of 0.8 cubic yards of soil and 130 gallons of water generated during fall 2021 site investigations.

Rebekah Reams

6/9/2022

Document, Report, or Work plan Review - other

March 30, 2022 groundwater sampling. Monitoring wells MW-2 and MW-5 were sampled for DRO and VOCs. All analytes were not detected or were detected below cleanup levels. The well casings of MW-1R and MW-3 was frozen. MW-8 was not located due to ice and snow, and MW-9 was dry. Groundwater flow direction was to the north by northwest. Depth to groundwater was 31.00 to 33.15 feet below ground surface.

Rebekah Reams

9/29/2022

Document, Report, or Work plan Review - other

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

Rebekah Reams

12/23/2022

Offsite Soil or Groundwater Disposal Approved

DEC approved transport of one 55-gallon drum of purge water for offsite disposal

Rebekah Reams

12/23/2022

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, and recommends next steps for the site.

Rebekah Reams

3/3/2023

Long Term Monitoring Workplan or Report Review

ADEC approved the Groundwater Sampling Reduction Request Work Plan Addendum for this site. Future groundwater monitoring under this approved addendum will include quarterly monitoring at wells MW-2 through MW-6, MW-8, and MW-9. Samples will be analyzed for DRO, BTEX, EDB, EDC, PAHs, and lead.

Rebekah Reams

Contaminant Information

Name

Level Description

Media

Comments

Control Type

Type

Details

Requirements

Description

Details

2022 Subsurface Investigation Report

2008 Well Decommissioning and Installation Report

2006 Subsurface Investigation Report

2003 Well Installation Report

2003 Baseline Assessment

1998 Release Investigation Report

2020 First Semi-Annual Groundwater Monitoring Report

1995 UST Removal Assessment Report

2017 Second Semi-Annual Groundwater Monitoring Report

2017 First Semi-Annual Groundwater Monitoring Report

2019 First Semi-Annual Groundwater Monitoring Report

November 2018 Groundwater Monitoring report

No associated sites were found.

Missing Location Data

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Alaska Department of Environmental Conservation

Site Report: Chevron - #1252

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

2022 Subsurface Investigation Report

2008 Well Decommissioning and Installation Report

2006 Subsurface Investigation Report

2003 Well Installation Report

2003 Baseline Assessment

1998 Release Investigation Report

2020 First Semi-Annual Groundwater Monitoring Report

1995 UST Removal Assessment Report

2017 Second Semi-Annual Groundwater Monitoring Report

2017 First Semi-Annual Groundwater Monitoring Report

2019 First Semi-Annual Groundwater Monitoring Report

November 2018 Groundwater Monitoring report

Missing Location Data

State of Alaska Department of Environmental Conservation