Site Report: Chevron 9-6489 - Triple A Service

Site Name:	Chevron 9-6489 - Triple A Service
Address:	1304 Airport Heights, Anchorage, AK 99501
File Number:	2100.26.066
Hazard ID:	23518
Status:	Active
Staff:	Rebekah Reams, 9074512144 rebekah.reams@alaska.gov
Latitude:	61.209398
Longitude:	-149.823677
Horizontal Datum:	NAD83

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

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

Contamination was first identified in soil and groundwater during a 1997 site assessment. In 1998 site facilities were upgraded and the existing underground storage tanks, dispensers, product piping, and contaminated soil were removed and excavation confirmation samples were collected. Additional site characterization and cleanup activities have included the advancement of soil borings, installation of monitoring wells and soil vapor probes, and collection of soil, groundwater, and soil gas samples as well as the application of oxygen injections into monitoring wells to enhance natural attenuation. Groundwater monitoring continues on a semi-annual schedule.

Action Information

Action Date	Action	Description	DEC Staff
9/3/1997	Document, Report, or Work plan Review - other	Soil and groundwater contamination was discovered during the installation of 3 monitoring wells (MW-1, MW-2, and MW-3) on the property. Groundwater was encountered at 27.33 to 28.32 feet below ground surface. Groundwater flow direction was to the northwest. Up to 186 mg/kg GRO and 0.0909 mg/kg benzene in the soil samples collected on August 27, 1997. Up to 14.8 mg/l GRO and 167 ug/l benzene in the groundwater samples collected on August 27, 1997.	Robert Weimer
4/16/1998	Document, Report, or Work plan Review - other	April 16, 1998 groundwater monitoring event. Up to 1.78 mg/l GRO and 262 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 3 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 27.12 to 28.43 feet below ground surface.	Robert Weimer
9/10/1998	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 77946 Five USTs were decommissioned and contamination was discovered.	David Allen
9/10/1998	Leaking Underground Storage Tank Cleanup Initiated - Petroleum		Former Staff
9/10/1998	Site Added to Database		Former Staff
9/11/1998	Underground Storage Tank Site Characterization or Assessment	Five USTs were removed and gasoline contamination was discovered. 150 cubic yards of gasoline contaminated soils were excavated treated thermally at ASR.	Robert Weimer
9/18/1998	Document, Report, or Work plan Review - other	On September 1, 1998 DEC approves work plan to decommission the three current site monitoring wells (MW-1, MW-2, and MW-3) prior to removal of the existing underground storage tanks (three gasoline, one used oil, and one heating oil) and associated piping for the planned facility upgrade. The monitoring wells were abandoned on September 8, 1998. The five underground storage tanks were removed between September 11, 1998 and September 18, 1998.	Robert Weimer
7/2/1999	Release Investigation	Release investigation included drilling and installation of four monitoring wells. See report on this activity dated 9/7/99.	Linda Nuechterlein
4/21/2000	Document, Report, or Work plan Review - other	ADEC approves work plan for monitoring well installation.	Linda Nuechterlein
1/30/2001	Meeting or Teleconference Held	Annual meeting with ADEC & Chevron to review Alaska sites and set goals for 2001. See meeting notes for additional details.	Linda Nuechterlein
8/21/2002	Update or Other Action	RECKEY has automatically been generated.	Cynthia Pring-Ham
6/19/2003	Leaking Underground Storage Tank Corrective Action Underway	Approved drill cutting soils to ASR for thermal treatment.	Robert Weimer
8/26/2004	Document, Report, or Work plan Review - other	June 8, 2004 groundwater monitoring report. Up to 73 mg/l GRO and 530 ug/l benzene in the groundwater. Contamination concentrations have increased in several wells.	Robert Weimer
12/9/2004	Document, Report, or Work plan Review - other	September 27, 2004 groundwater monitoring report. Up to 8.7 mg/l GRO and 79 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing.	Robert Weimer
8/5/2005	Document, Report, or Work plan Review - other	May 10, 2005 groundwater monitoring report. Up to 34 mg/l GRO and 190 ug/l benzene in the groundwater. Contamination concentrations appear to be increasing. Groundwater flow direction is to the northwest.	Robert Weimer
12/1/2005	Document, Report, or Work plan Review - other	September 27, 2005 groundwater monitoring report. Up to 9.6 mg/l GRO and 140 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flow direction is to the northwest. Depth to groundwater is 25 to 27 feet below ground surface.	Robert Weimer
1/10/2006	Meeting or Teleconference Held	Meeting with RP's consultant to discuss future site work. Additional monitoring well needed to northwest. Possible vac pump of groundwater.	Robert Weimer
5/11/2006	Meeting or Teleconference Held	Meeting with RP and their consultant to discuss future site work. Additional monitoring well needed to northwest. They are working on access.	Robert Weimer
7/5/2006	Document, Report, or Work plan Review - other	ADEC review and approval of a release investigation workplan for the installation of a monitoring well across the street to the northwest. The monitoring well is to be installed this month.	Robert Weimer
9/8/2006	Offsite Soil or Groundwater Disposal Approved	ADEC approves thermal treatment of 3 drums of contaminated soil.	Robert Weimer
11/1/2006	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
11/27/2006	Document, Report, or Work plan Review - other	May 16, 2006 groundwater monitoring report. Up to 17 mg/l GRO and 110 ug/l benzene in the groundwater. Contamination concentrations appear to be higher in the summer and lower in the fall. Groundwater flow direction is to the north by northwest. Depth to groundwater is 26 to 28 feet below ground surface.	Robert Weimer
3/5/2007	Document, Report, or Work plan Review - other	September 22, 2006 groundwater monitoring report. Up to 6 mg/l GRO and 110 ug/l benzene in the groundwater. Contamination concentrations appear to be higher in the summer and lower in the fall. Groundwater flow direction is to the north by northwest. Depth to groundwater is 25 to 27 feet below ground surface.	Robert Weimer
4/2/2007	Meeting or Teleconference Held	Meeting with RP to discuss site. They are to continue with semi-annual monitoring and sampling.	Robert Weimer
10/5/2007	Conceptual Site Model Submitted	Conceptual Site Model (CSM) identified incidental soil ingestion, inhalationof outdoor air, inhalation of indoor air. Also potential groundwater ingestion.	Robert Weimer
12/5/2007	Document, Report, or Work plan Review - other	Review subsurface investigation report. One new monitoring well (MW-11) was installed on July 11, 2006 to help define the extent of the soil and groundwater contamination to the northwest of the site. Groundwater was encountered 28 feet below ground surface. All of the soil samples (BTEX/GRO) were non-detect.	Robert Weimer
1/14/2008	Document, Report, or Work plan Review - other	May 23, 2007 groundwater monitoring report. Up to 4.9 mg/l GRO and 90 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flow direction is to the northwest. Depth to groundwater is 26.11 to 28.58 feet below ground surface.	Robert Weimer
1/18/2008	Conceptual Site Model Submitted	Review preliminary conceptual site model.	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 begin oxygen or ozone injection in site source area monitoring wells.	Robert Weimer
3/21/2008	Exposure Tracking Model Ranking	Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site.	Robert Weimer
4/23/2008	Document, Report, or Work plan Review - other	ADEC approves workplan to inject oxygen into monitoring wells MW-4, MW-6, and MW-7, and to collect analytical and natural attenuation parameters.	Robert Weimer
7/29/2008	Document, Report, or Work plan Review - other	September 21, 2007 groundwater monitoring report. Up to 3.1 mg/l GRO and 30 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flow direction is to the west by northwest. Depth to groundwater is 25.36 to 28.60 feet below ground surface.	Robert Weimer
8/4/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
9/25/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
12/4/2008	Document, Report, or Work plan Review - other	May 2, 2008 groundwater monitoring report. Up to 20.4 mg/l GRO and 41.5 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.18 to 28.62 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 submit a report of the results of the oxygen injection events. ADEC approves suspending the sampling sampling of monitoring wells MW-8 and MW-9 until further notice.	Robert Weimer
4/10/2009	Document, Report, or Work plan Review - other	July 14, 2008 groundwater monitoring report. Up to 16 mg/l GRO and 100 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.12 to 27.46 feet below ground surface.	Robert Weimer
6/17/2009	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of one drum of contaminated purge water.	Robert Weimer
7/7/2009	Document, Report, or Work plan Review - other	Oxygen was injected into groundwater monitoring wells MW-4, MW-6, and MW-7 to enhance biodegradation of dissolved petroleum hydrocarbons on May 5, June 2, June 10, July 15, and August 6, 2008. Approximately 125 cubic feet of oxygen was injected into each monitoring well. GRO in MW-7 was reduced from 20.4 mg/l to 0.2 mg/l. Benzene in MW-7 was reduced from 415 ug/l to 9 ug/l. Dissolved oxygen levels in monitoring well MW-4 rose from 0.2% to 35%, MW-6 from 3.06% to 14.2%.	Robert Weimer
10/13/2009	Document, Report, or Work plan Review - other	May 5, 2009 groundwater monitoring report. Up to 8 mg/l GRO and 190 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 7 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.51 to 27.97 feet below ground surface.	Robert Weimer
10/26/2009	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of one drum of contaminated purge water.	Robert Weimer
2/25/2010	Document, Report, or Work plan Review - other	August 28, 2009 groundwater monitoring event. Up to 11 mg/l GRO and 350 ug/l benzene in the groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.52 to 27.98 feet below ground surface.	Robert Weimer
3/11/2010	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 3/10/10. MW4 and MW7 are to be sampled for PAH the next monitoring event. Chevron will submit a soil gas sampling workplan will be submitted by June 30, 2010. Monitoring well MW8 & MW9 are approved to be abandoned. We discussed that groundwater samples for volatiles should not be collected with bailers or peristaltic pumps due to the loss of volatiles, Chevron is to provide a workplan specifying how groundwater samples will be collected in the future.	Robert Weimer
4/9/2010	Document, Report, or Work plan Review - other	DEC review of Site Vapor Intrusion Evaluation report for this site. The report concluded that this site does have a potential for vapor intrusion into the service station building based on structures currently being within 30 feet of the remaining soil and groundwater contamination at this site. A soil gas sampling workplan will be submitted for DEC approval by June 30, 2010.	Robert Weimer
5/20/2010	Update or Other Action	Approved, until further notice, no-purge groundwater sampling at this site.	Robert Weimer
8/27/2010	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	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
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
5/6/2011	Document, Report, or Work plan Review - other	July 22, 2010 groundwater monitoring event. Up to 3.5 mg/l GRO and 63 ug/l benzene in the groundwater. No PAH's were detected over cleanup levels. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.75 to 28.18 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring.	Robert Weimer
7/22/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
8/2/2011	Document, Report, or Work plan Review - other	September 5, 2010 groundwater monitoring event. Up to 3.0 mg/l GRO and 44 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.59 to 28.03 feet below ground surface. Monitoring wells MW-8 and MW-9 were decommissioned in accordance with the approved plan. The consultant recommends continued semi-annual groundwater monitoring.	Robert Weimer
9/8/2011	Document, Report, or Work plan Review - other	ADEC approves temporary storage of drill cuttings and decon water at the secure area at 1441 C Street.	Robert Weimer
9/8/2011	Site Characterization Workplan Approved	ADEC reviews and approves soil vapor assessment work plan. The work plan proposes to install two soil vapor wells and collect air samples to help assess the soil vapor concenrtations near the on-property building.	Robert Weimer
10/25/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
11/4/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves request for thermal treatment of one drum and one super sack of contaminated soil. The soil was generated during the September 2011 soil vapor probe installation.	Robert Weimer
11/4/2011	Document, Report, or Work plan Review - other	ADEC approves request for thermal treatment of one drum and one super sack of contaminated soil. The soil was generated during the September 2011 soil vapor probe installation.	Robert Weimer
2/6/2012	Document, Report, or Work plan Review - other	On September 12, 2011 two multi-level (at 8, 16, and 25 feet below ground surface) soil gas sampling wells were installed and sampled. Up to 0.29 mg/kg benzene, 0.19 mg/kg methylene chloride, 5.3 mg/kg GRO, and 54 mg/kg DRO in the soil samples collected. Up to 63 mg/m3 benzene, non-detect (<1.7 mg/m3) ethylbenzene, non-detect (<4.2 mg/m3) naphthalene, and non-detect (<1.7 mg/m3) xylenes in SVP-2 at 25 feet bgs. Up to non-detect (<1.3 mg/m3) benzene, non-detect (<1.7 mg/m3) ethylbenzene, non-detect (<4.2 mg/m3) naphthalene, and non-detect (<1.7 mg/m3) xylenes in SVP-1 at 25 feet bgs. The SVP-2 benzene exceeds Commerical Deep Soil Gas screening levels (1.6 mg/m3). The detection level for naphthalene exceeded Commerical Deep Soil Gas screening levels (0.36 mg/m3).	Robert Weimer
2/29/2012	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/28/12. Chevron is to continue semiannual groundwater monitoring and conduct soil gas sampling of SVP-1 and SVP-2 in the spring of 2012.	Robert Weimer
3/27/2012	Document, Report, or Work plan Review - other	June 9-10, 2011 groundwater monitoring event. Up to 0.86 mg/l GRO and 16 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.96 to 29.39 feet below ground surface. Monitoring wells MW-8 and MW-9 were decommissioned in accordance with the approved plan. The consultant recommends continued semi-annual groundwater monitoring.	Robert Weimer
8/21/2012	Offsite Soil or Groundwater Disposal Approved	ADEC approves offsite treatment of contaminated purge water.	Robert Weimer
11/28/2012	Offsite Soil or Groundwater Disposal Approved	ADEC approves offsite treatment of contaminated purge water.	Robert Weimer
1/30/2013	Document, Report, or Work plan Review - other	September 18, 2011 groundwater monitoring event. Up to 0.84 mg/l GRO and 20 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is historically to the northwest.	Robert Weimer
1/30/2013	Document, Report, or Work plan Review - other	May 30, 2012 groundwater monitoring event. Up to 0.80 mg/l GRO and 25 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater was 25.99 to 28.45 feet below ground surface.	Robert Weimer
1/30/2013	Document, Report, or Work plan Review - other	September 19, 2012 groundwater monitoring event. Up to 0.41 mg/l GRO and 31 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.31 to 28.7 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring.	Robert Weimer
2/19/2013	Document, Report, or Work plan Review - other	On May 30, 2012 two multi-level (at 8, 16, and 25 feet below ground surface) soil gas sampling wells were sampled. Up to 21 mg/m3 benzene, non-detect (<8.7 mg/m3) ethylbenzene, non-detect (<21 mg/m3) naphthalene, and non-detect (<8.7 mg/m3) xylenes in SVP-2 at 25 feet bgs. Up to non-detect (<6.4 mg/m3) benzene, 9.2 mg/m3 ethylbenzene, non-detect (<21 mg/m3) naphthalene, and 20 mg/m3 xylenes in SVP-1 at 25 feet bgs. The SVP-2 benzene and SVP-1 ethylbenzene exceeds Commerical Deep Soil Gas screening levels (1.6 mg/m3 and 4.9 mg/m3). The SVP-1 xylenes exceeds Residential Deep Soil Gas screening levels (10 mg/m3). The detection level for naphthalene exceeded Commerical Deep Soil Gas screening levels (0.36 mg/m3). They are to sample again in the fall of 2012.	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. The will conduct soil vapor sampling in March 2013 and September 2013. 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
3/21/2013	Update or Other Action	The Department requests that soil gas sampling reports are provided on a semi-annual basis so a timely response can occur if the first monitoring event shows a problem or if there are QA/QC issues that would warrant another immediate soil vapor sampling event.	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
5/17/2013	Site Visit	Site visit to observe groundwater monitoring. They were collecting with no-purge with hydrasleeves and purge sampling with a bladder pump.	Robert Weimer
11/14/2013	Document, Report, or Work plan Review - other	On September 18, 2012 two multi-level (at 8, 16, and 25 feet below ground surface) soil gas sampling wells were sampled. The samples were non-detect (<64 mg/m3) benzene, (<87 mg/m3) ethylbenzene, (<100 mg/m3) naphthalene, and (<87 mg/m3) xylenes in SVP-2 at 25 feet bgs. The SVP-2 detection limit for benzene exceeds Commerical Deep Soil Gas screening levels (1.6 mg/m3). They need a frozen ground soil gas sampling event.	Robert Weimer
1/21/2014	Document, Report, or Work plan Review - other	May 16-17, 2013 groundwater monitoring event. Up to 2.0 mg/l GRO and 42 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction is to the west. Depth to groundwater is 26.31 to 28.43 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The monitoring wells were sampled by both no-purge with hydrasleeves, and purge with a bladder pump. The sampling interval for the bladder pump was not documented in the field notes. The hydrasleeve sampling was from the top of the water column.	Robert Weimer
2/19/2014	Document, Report, or Work plan Review - other	On March 28, 2013 two multi-level (at 8, 16, and 25 feet below ground surface) soil gas sampling wells were sampled. Up to 41 mg/m3 benzene, 11 mg/m3 toluene, non-detect (<8.7 mg/m3) ethylbenzene, non-detect (<21 mg/m3) naphthalene, and 11 mg/m3 xylenes in SVP-2 at 25 feet bgs. The SVP-2 benzene exceeds Commerical Deep Soil Gas screening levels (1.6 mg/m3). All other soil gas samples met Deep and Shallow Soil Gas screening levels.	Robert Weimer
2/20/2014	Document, Report, or Work plan Review - other	On September 16, 2013 two multi-level (at 8, 16, and 25 feet below ground surface) soil gas sampling wells were sampled. Up to 20 mg/m3 benzene, non-detect (<0.75 mg/m3) toluene, non-detect (<0.87 mg/m3) ethylbenzene, non-detect (<2.1 mg/m3) naphthalene, and non-detect (<0.87 mg/m3) xylenes in SVP-2 at 25 feet bgs. The SVP-2 benzene exceeds Commerical Deep Soil Gas screening levels (1.6 mg/m3). All other soil gas samples met Deep and Shallow Soil Gas screening levels.	Robert Weimer
2/27/2014	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/27/2014. They plan to continue semi-annual groundwater monitoring. They will submit a work plan for the removal of the soil gas probes. 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. In the future they will need to evaluate for a diving plume on the monitoring wells far from the release point. 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
4/24/2014	Document, Report, or Work plan Review - other	DEC provided comments on the proposed Soil Vapor Probe Decommission Work Plan for this site. The probes need to be decommissioned using methods similar to the monitoring well decommissioning section of the ADEC September 2013 Monitoring Well Guidance. This includes knocking out the bottom of the probe and filling with a grout or bentonite chips to near the ground surface as the probe casing is removed. Chips will require hydration after completion.	Robert Weimer
4/28/2014	Document, Report, or Work plan Review - other	DEC approved revised Soil Vapor Probe Decommission Work Plan for this site. The probes are to be decommissioned using methods similar to the monitoring well decommissioning section of the ADEC September 2013 Monitoring Well Guidance. This includes removing the teflon tubing and filling the hole with hydrated bentonite chips to near the ground surface after the tubing is removed.	Robert Weimer
5/9/2014	Document, Report, or Work plan Review - other	September 16, 2013 groundwater monitoring event. Up to 1.4 mg/l GRO and 23 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.66 to 28.11 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The monitoring wells were sampled by no-purge with hydrasleeves. The hydrasleeve sampling was from the top of the water column.	Robert Weimer
3/5/2015	Document, Report, or Work plan Review - other	November 6, 2013 groundwater monitoring event. Up to 2.1 mg/l GRO and 12 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.95 to 27.88 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The monitoring wells were sampled by purge with bladder pump from the top of the water column.	Robert Weimer
3/26/2015	Document, Report, or Work plan Review - other	May 5, 2014 groundwater monitoring event. Up to 2.6 mg/l GRO and 15 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.94 to 28.36 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The monitoring wells were sampled by purge with bladder pump. The sample results are considered biased low because the pump intake was not within the top foot of the water column in all 6 monitoring wells, they ranged from 1.9 to 2.06 feet below the soil/water interface.	Robert Weimer
7/15/2015	Document, Report, or Work plan Review - other	Soil Vapor Probe Decommission report. The probes were decommissioned using methods similar to the monitoring well decommissioning section of the ADEC September 2013 Monitoring Well Guidance. This included removing the top two feet of teflon tubing and filling the hole with hydrated bentonite chips to near the ground surface after the tubing is removed.	Robert Weimer
8/17/2015	Conceptual Site Model Submitted	Review revised conceptual site model. Soil ingestion and direct contact, groundwater ingestion, and inhalation of outdoor air were identified as completed pathways.	Robert Weimer
1/25/2016	Update or Other Action	DEC approves extension request to submit the 2nd semi-annual 2015 groundwater monitoring report by February 29, 2016.	Robert Weimer
4/1/2016	Document, Report, or Work plan Review - other	April 28, 2015 groundwater monitoring event. Up to 0.66 mg/l GRO, non-detect MTBE, and 6.5 ug/l benzene in the groundwater. Contamination concentrations increased in 0 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.91 to 29.34 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.	Robert Weimer
6/16/2016	Document, Report, or Work plan Review - other	November 11, 2015 groundwater monitoring event. Up to 0.94 mg/l GRO, non-detect MTBE, and 11.0 ug/l benzene in the groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction is to the west. Depth to groundwater is 26.03 to 27.36 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required except for monitoring well MW-11 where it was not documented in the field notes.	Robert Weimer
2/1/2017	Document, Report, or Work plan Review - other	May 25, 2016 groundwater monitoring event. Up to 0.52 mg/l GRO and 3.0 ug/l benzene in the groundwater. Contamination concentrations increased in 0 of the 6 monitoring wells sampled. Groundwater flow direction is to the west by northwest. Depth to groundwater is 26.63 to 29.03 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.	Robert Weimer
10/31/2017	Document, Report, or Work plan Review - other	October 20, 2016 groundwater monitoring event. Up to 2.6 mg/l GRO and 46.0 ug/l benzene in the groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.97 to 28.42 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.	Robert Weimer
11/1/2017	Document, Report, or Work plan Review - other	June 23, 2017 groundwater monitoring event. Up to 2.7 mg/l GRO and 28.0 ug/l benzene in the groundwater. Contamination levels increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the west by northwest. Depth to groundwater is 26.04 to 28.46 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.	Robert Weimer
3/8/2018	Document, Report, or Work plan Review - other	October 11, 2017 groundwater monitoring event. Up to 7.8 mg/l GRO and 108.0 ug/l benzene in the groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.50 to 28.27 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.	Robert Weimer
3/14/2018	Update or Other Action	DEC approves suspending, until further notice, the sampling for GRO in monitoring wells 5 & 6. DEC requests that during the next monitoring event that all of the monitoring wells have samples analyzed for the full VOCs (method 8260) and PAHs (method 8270). Based on a review of the results of that sampling further reduction in groundwater monitoring may be approved.	Robert Weimer
10/9/2018	Document, Report, or Work plan Review - other	May 22, 2018 groundwater monitoring event. Up to 2.4 mg/l GRO, 16 ug/l naphthalene (1.7 ug/l cleanup level) and 19 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.09 to 28.52 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.	Robert Weimer
1/18/2019	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77946 1997 ust contamination.	Robert Weimer
7/2/2019	Document, Report, or Work plan Review - other	October 17, 2018 groundwater monitoring event. Up to 6.8 mg/l GRO and 87 ug/l benzene in the groundwater. PAH sampling was not conducted this sampling event. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.73 to 28.20 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.	Robert Weimer
9/23/2019	Update or Other Action	ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also VOC sampling needs to include the full 8260 VOC list including naphthalene.	Robert Weimer
3/12/2020	Update or Other Action	ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also all BTEX and VOC sampling needs to include the full 8260 VOC list including naphthalene. ADEC is also requesting that all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. ADEC requests that PAH analysis be conducted in all of the monitoring wells to be sampled.	Robert Weimer
3/17/2020	Document, Report, or Work plan Review - other	DEC reviewed 2020 groundwater sampling plan and provided the following comments: For all future monitoring events please make sure that the field notes document the measurement of the pump intake that is within the top foot of the water column at the time of the sampling unless the top of the well screened interval is deeper, then in that case from the top foot of that screened interval. For all future monitoring events any monitoring well where BTEX or HVOC sampling is proposed it needs to be the full VOC (method 8260) list, including naphthalene. The field QC samples are per day of sampling at a site. For all future monitoring events all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. For all future monitoring events if a monitoring well is low yield and purges dry then a sample will still need to be collected that monitoring event once the monitoring well has recharged to approximately 80% of its pre-purge volume. If it has not returned to 80% of its pre-purged volume during that sampling day DEC requests that you return to the site early the next day to attempt to collect the water sample. DEC also requested PAH analysis for all site monitoring wells to be sampled.	Robert Weimer
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
7/30/2021	Document, Report, or Work plan Review - other	2019 First Semi-Annual Groundwater Monitoring event was conducted on May 28, 2019. Well survey was completed on June 6, 2019. Groundwater samples were collected from monitoring wells MW-4, MW-5, MW-6, MW-7, MW-10, and MW-11. Samples were submitted to the laboratory for BTEX and GRO. Groundwater flow direction was to the west-northwest and depth to groundwater was 26.03 to 28.45 feet below ground surface.	Rebekah Reams
7/30/2021	Document, Report, or Work plan Review - other	2019 Second Semi-Annual Groundwater Monitoring event was conducted on October 9, 2019. Groundwater samples were collected from monitoring wells MW-4, MW-5, MW-6, MW-10, and MW-11. MW-7 was not sampled due to sediment in the well that clogged sampling equipment. Samples were submitted to the laboratory for BTEX and GRO. Groundwater flow direction was to the northwest and depth to groundwater was 25.95 to 28.38 feet below ground surface.	Rebekah Reams
7/30/2021	Document, Report, or Work plan Review - other	2020 First Semi-Annual Groundwater Monitoring event was conducted on May 7, 2020. Groundwater samples were collected from monitoring wells MW-6, MW-10, and MW-11. MW-4 was not sampled due access issues and MW-5 and MW-7 were not sampled due to ice obstructions within the well casing. Samples were submitted to the laboratory for GRO, VOCs and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 26.41 to 28.21 feet below ground surface.	Rebekah Reams
7/30/2021	Document, Report, or Work plan Review - other	2020 Second Semi-Annual Groundwater Monitoring event was conducted on November 11th and 19th, 2020. Groundwater samples were collected from monitoring wells MW-4 through MW-7 and MW-10. MW-11 was inaccessible due to ice cover. Samples were submitted to the laboratory for GRO, VOCs and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 25.92 to 28.31 feet below ground surface.	Rebekah Reams
8/4/2021	Long Term Monitoring Workplan or Report Review	2021 First Semi-Annual Groundwater Monitoring event was conducted on May 10, 2021. Groundwater samples were collected from monitoring wells MW-4, MW-6, MW-7, MW-10, and MW-11. MW-5 was frozen over and could not be sampled. Samples were submitted to the laboratory for GRO, VOCs and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 26.02 to 28.44 feet below ground surface.	Rebekah Reams
1/26/2022	Long Term Monitoring Workplan or Report Review	2021 Second Semi-Annual Groundwater Monitoring event was conducted on October 4, 2021. Groundwater samples were collected from monitoring wells MW-4 through MW-7, MW-10, and MW-11. Samples were submitted to the laboratory for GRO, VOCs and PAHs. Groundwater flow direction was to the northwest and depth to groundwater was 25.67 to 27.55 feet below ground surface.	Rebekah Reams
7/14/2022	Long Term Monitoring Workplan or Report Review	2022 First Semi-Annual Groundwater Monitoring event was conducted on May 3, 2022. Groundwater samples were collected from monitoring wells MW-4 through MW-7, MW-10, and MW-11. Samples were submitted to the laboratory for GRO, VOCs and PAHs. Groundwater flow direction was to the northwest and depth to groundwater was 25.40 to 27.81 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
4/3/2023	Long Term Monitoring Workplan or Report Review	2022 Second Semi-Annual Groundwater Monitoring event was conducted on August 24, 2022. Groundwater samples were collected from monitoring wells MW-4 through MW-7, MW-10, and MW-11. Samples were submitted to the laboratory for GRO, VOCs and PAHs. No groundwater cleanup levels exceedances were observed during this sampling event. Groundwater flow direction was to the west-northwest and depth to groundwater was 24.88 to 27.35 feet below ground surface.	Rebekah Reams
4/3/2023	Long Term Monitoring Established	ADEC approved the Groundwater Sampling Analyte Reduction Request – Groundwater Sampling Work Plan Addendum which proposes to update the groundwater monitoring schedule to include analysis for GRO, BTEX, naphthalene, 1,2,4-trimethylbenzene, and 1,3,5-trimethylbenzene at monitoring wells MW-4, MW-6, MW-7, and MW-11 on a semi-annual basis.	Rebekah Reams
6/23/2023	Long Term Monitoring Workplan or Report Review	2023 First Semi-Annual Groundwater Monitoring event was conducted on April 24, 2023. Groundwater samples were collected from monitoring wells MW-4, MW-6, MW-7, and MW-11. Samples were submitted to the laboratory for GRO and select VOCs. No groundwater cleanup levels exceedances were observed during this sampling event. Groundwater flow direction was to the west-northwest and depth to groundwater was 25.96 to 28.54 feet below ground surface.	Rebekah Reams
10/30/2023	Long Term Monitoring Workplan or Report Review	2023 Second Semi-Annual Groundwater Monitoring event was conducted on September 11, 2023. Groundwater samples were collected from monitoring wells MW-4, MW-6, MW-7, and MW-11. Samples were submitted to the laboratory for GRO and select VOCs. Ethylbenzene and naphthalene exceedances were observed during this sampling event. Groundwater flow direction was to the west-northwest and depth to groundwater was 24.90 to 27.35 feet below ground surface.	Rebekah Reams
5/30/2024	Long Term Monitoring Workplan or Report Review	2024 First Semi-Annual Groundwater Monitoring event was conducted on April 15, 2024. Groundwater samples were collected from monitoring wells MW-4, MW-6, and MW-7. MW-11 was frozen and could not be gauged or sampled. Samples were submitted to the laboratory for GRO and select VOCs. No groundwater cleanup levels exceedances were observed during this sampling event. Groundwater flow direction was to the west-northwest and depth to groundwater was 25.76 to 28.19 feet below ground surface.	Rebekah Reams
9/24/2024	Site Visit	ADEC conducted a site visit with Chevron and Arcadis personnel to observe site layout, sampling locations, and nearby features.	Rebekah Reams
9/25/2024	Meeting or Teleconference Held	ADEC staff met with Chevron and their consultant for an annual portfolio meeting to discuss site status, upcoming document submittals, pending reviews, and general updates for Chevron's contaminated sites throughout the state.	Rebekah Reams
10/15/2024	Long Term Monitoring Workplan or Report Review	2024 Second Semi-Annual Groundwater Monitoring event was conducted on August 12, 2024. Groundwater samples were collected from monitoring wells MW-4, MW-6, MW-7. and MW-11. Samples were submitted to the laboratory for GRO and select VOCs. Ethylbenzene, total xylenes, naphthalene, and 1,2,4-trimethylbenzene exceedances were observed during this sampling event. Groundwater flow direction was to the west-northwest and depth to groundwater was 24.02 to 26.45 feet below ground surface.	Rebekah Reams
10/31/2024	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77946 1997 ust contamination.	Rebekah Reams
11/12/2024	Document, Report, or Work plan Review - other	ADEC approved the Conceptual Site Model and Site Investigation Work Plan following comment resolution. This document summarizes site history, evaluates exposure pathways, identifies data gaps, and proposes to advance 14 soil borings and one monitoring well to evaluate current contaminant concentrations and determine the extent of contamination at the site.	Rebekah Reams

Action Date

Action

Description

DEC Staff

9/3/1997

Document, Report, or Work plan Review - other

Soil and groundwater contamination was discovered during the installation of 3 monitoring wells (MW-1, MW-2, and MW-3) on the property. Groundwater was encountered at 27.33 to 28.32 feet below ground surface. Groundwater flow direction was to the northwest. Up to 186 mg/kg GRO and 0.0909 mg/kg benzene in the soil samples collected on August 27, 1997. Up to 14.8 mg/l GRO and 167 ug/l benzene in the groundwater samples collected on August 27, 1997.

Robert Weimer

4/16/1998

Document, Report, or Work plan Review - other

April 16, 1998 groundwater monitoring event. Up to 1.78 mg/l GRO and 262 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 3 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater is 27.12 to 28.43 feet below ground surface.

Robert Weimer

9/10/1998

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 77946 Five USTs were decommissioned and contamination was discovered.

David Allen

9/10/1998

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

Former Staff

9/10/1998

Site Added to Database

Former Staff

9/11/1998

Underground Storage Tank Site Characterization or Assessment

Five USTs were removed and gasoline contamination was discovered. 150 cubic yards of gasoline contaminated soils were excavated treated thermally at ASR.

Robert Weimer

9/18/1998

Document, Report, or Work plan Review - other

On September 1, 1998 DEC approves work plan to decommission the three current site monitoring wells (MW-1, MW-2, and MW-3) prior to removal of the existing underground storage tanks (three gasoline, one used oil, and one heating oil) and associated piping for the planned facility upgrade. The monitoring wells were abandoned on September 8, 1998. The five underground storage tanks were removed between September 11, 1998 and September 18, 1998.

Robert Weimer

7/2/1999

Release Investigation

Release investigation included drilling and installation of four monitoring wells. See report on this activity dated 9/7/99.

Linda Nuechterlein

4/21/2000

Document, Report, or Work plan Review - other

ADEC approves work plan for monitoring well installation.

Linda Nuechterlein

1/30/2001

Meeting or Teleconference Held

Annual meeting with ADEC & Chevron to review Alaska sites and set goals for 2001. See meeting notes for additional details.

Linda Nuechterlein

8/21/2002

Update or Other Action

RECKEY has automatically been generated.

Cynthia Pring-Ham

6/19/2003

Leaking Underground Storage Tank Corrective Action Underway

Approved drill cutting soils to ASR for thermal treatment.

Robert Weimer

8/26/2004

Document, Report, or Work plan Review - other

June 8, 2004 groundwater monitoring report. Up to 73 mg/l GRO and 530 ug/l benzene in the groundwater. Contamination concentrations have increased in several wells.

Robert Weimer

12/9/2004

Document, Report, or Work plan Review - other

September 27, 2004 groundwater monitoring report. Up to 8.7 mg/l GRO and 79 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing.

Robert Weimer

8/5/2005

Document, Report, or Work plan Review - other

May 10, 2005 groundwater monitoring report. Up to 34 mg/l GRO and 190 ug/l benzene in the groundwater. Contamination concentrations appear to be increasing. Groundwater flow direction is to the northwest.

Robert Weimer

12/1/2005

Document, Report, or Work plan Review - other

September 27, 2005 groundwater monitoring report. Up to 9.6 mg/l GRO and 140 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flow direction is to the northwest. Depth to groundwater is 25 to 27 feet below ground surface.

Robert Weimer

1/10/2006

Meeting or Teleconference Held

Meeting with RP's consultant to discuss future site work. Additional monitoring well needed to northwest. Possible vac pump of groundwater.

Robert Weimer

5/11/2006

Meeting or Teleconference Held

Meeting with RP and their consultant to discuss future site work. Additional monitoring well needed to northwest. They are working on access.

Robert Weimer

7/5/2006

Document, Report, or Work plan Review - other

ADEC review and approval of a release investigation workplan for the installation of a monitoring well across the street to the northwest. The monitoring well is to be installed this month.

Robert Weimer

9/8/2006

Offsite Soil or Groundwater Disposal Approved

ADEC approves thermal treatment of 3 drums of contaminated soil.

Robert Weimer

11/1/2006

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

11/27/2006

Document, Report, or Work plan Review - other

May 16, 2006 groundwater monitoring report. Up to 17 mg/l GRO and 110 ug/l benzene in the groundwater. Contamination concentrations appear to be higher in the summer and lower in the fall. Groundwater flow direction is to the north by northwest. Depth to groundwater is 26 to 28 feet below ground surface.

Robert Weimer

3/5/2007

Document, Report, or Work plan Review - other

September 22, 2006 groundwater monitoring report. Up to 6 mg/l GRO and 110 ug/l benzene in the groundwater. Contamination concentrations appear to be higher in the summer and lower in the fall. Groundwater flow direction is to the north by northwest. Depth to groundwater is 25 to 27 feet below ground surface.

Robert Weimer

4/2/2007

Meeting or Teleconference Held

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

Robert Weimer

10/5/2007

Conceptual Site Model Submitted

Conceptual Site Model (CSM) identified incidental soil ingestion, inhalationof outdoor air, inhalation of indoor air. Also potential groundwater ingestion.

Robert Weimer

12/5/2007

Document, Report, or Work plan Review - other

Review subsurface investigation report. One new monitoring well (MW-11) was installed on July 11, 2006 to help define the extent of the soil and groundwater contamination to the northwest of the site. Groundwater was encountered 28 feet below ground surface. All of the soil samples (BTEX/GRO) were non-detect.

Robert Weimer

1/14/2008

Document, Report, or Work plan Review - other

May 23, 2007 groundwater monitoring report. Up to 4.9 mg/l GRO and 90 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flow direction is to the northwest. Depth to groundwater is 26.11 to 28.58 feet below ground surface.

Robert Weimer

1/18/2008

Conceptual Site Model Submitted

Review preliminary conceptual site model.

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 begin oxygen or ozone injection in site source area monitoring wells.

Robert Weimer

3/21/2008

Exposure Tracking Model Ranking

Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site.

Robert Weimer

4/23/2008

Document, Report, or Work plan Review - other

ADEC approves workplan to inject oxygen into monitoring wells MW-4, MW-6, and MW-7, and to collect analytical and natural attenuation parameters.

Robert Weimer

7/29/2008

Document, Report, or Work plan Review - other

September 21, 2007 groundwater monitoring report. Up to 3.1 mg/l GRO and 30 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flow direction is to the west by northwest. Depth to groundwater is 25.36 to 28.60 feet below ground surface.

Robert Weimer

8/4/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

9/25/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

12/4/2008

Document, Report, or Work plan Review - other

May 2, 2008 groundwater monitoring report. Up to 20.4 mg/l GRO and 41.5 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.18 to 28.62 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 submit a report of the results of the oxygen injection events. ADEC approves suspending the sampling sampling of monitoring wells MW-8 and MW-9 until further notice.

Robert Weimer

4/10/2009

Document, Report, or Work plan Review - other

July 14, 2008 groundwater monitoring report. Up to 16 mg/l GRO and 100 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.12 to 27.46 feet below ground surface.

Robert Weimer

6/17/2009

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of one drum of contaminated purge water.

Robert Weimer

7/7/2009

Document, Report, or Work plan Review - other

Oxygen was injected into groundwater monitoring wells MW-4, MW-6, and MW-7 to enhance biodegradation of dissolved petroleum hydrocarbons on May 5, June 2, June 10, July 15, and August 6, 2008. Approximately 125 cubic feet of oxygen was injected into each monitoring well. GRO in MW-7 was reduced from 20.4 mg/l to 0.2 mg/l. Benzene in MW-7 was reduced from 415 ug/l to 9 ug/l. Dissolved oxygen levels in monitoring well MW-4 rose from 0.2% to 35%, MW-6 from 3.06% to 14.2%.

Robert Weimer

10/13/2009

Document, Report, or Work plan Review - other

May 5, 2009 groundwater monitoring report. Up to 8 mg/l GRO and 190 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 7 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.51 to 27.97 feet below ground surface.

Robert Weimer

10/26/2009

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of one drum of contaminated purge water.

Robert Weimer

2/25/2010

Document, Report, or Work plan Review - other

August 28, 2009 groundwater monitoring event. Up to 11 mg/l GRO and 350 ug/l benzene in the groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.52 to 27.98 feet below ground surface.

Robert Weimer

3/11/2010

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 3/10/10. MW4 and MW7 are to be sampled for PAH the next monitoring event. Chevron will submit a soil gas sampling workplan will be submitted by June 30, 2010. Monitoring well MW8 & MW9 are approved to be abandoned. We discussed that groundwater samples for volatiles should not be collected with bailers or peristaltic pumps due to the loss of volatiles, Chevron is to provide a workplan specifying how groundwater samples will be collected in the future.

Robert Weimer

4/9/2010

Document, Report, or Work plan Review - other

DEC review of Site Vapor Intrusion Evaluation report for this site. The report concluded that this site does have a potential for vapor intrusion into the service station building based on structures currently being within 30 feet of the remaining soil and groundwater contamination at this site. A soil gas sampling workplan will be submitted for DEC approval by June 30, 2010.

Robert Weimer

5/20/2010

Update or Other Action

Approved, until further notice, no-purge groundwater sampling at this site.

Robert Weimer

8/27/2010

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

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

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

5/6/2011

Document, Report, or Work plan Review - other

July 22, 2010 groundwater monitoring event. Up to 3.5 mg/l GRO and 63 ug/l benzene in the groundwater. No PAH's were detected over cleanup levels. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.75 to 28.18 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring.

Robert Weimer

7/22/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

8/2/2011

Document, Report, or Work plan Review - other

September 5, 2010 groundwater monitoring event. Up to 3.0 mg/l GRO and 44 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.59 to 28.03 feet below ground surface. Monitoring wells MW-8 and MW-9 were decommissioned in accordance with the approved plan. The consultant recommends continued semi-annual groundwater monitoring.

Robert Weimer

9/8/2011

Document, Report, or Work plan Review - other

ADEC approves temporary storage of drill cuttings and decon water at the secure area at 1441 C Street.

Robert Weimer

9/8/2011

Site Characterization Workplan Approved

ADEC reviews and approves soil vapor assessment work plan. The work plan proposes to install two soil vapor wells and collect air samples to help assess the soil vapor concenrtations near the on-property building.

Robert Weimer

10/25/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

11/4/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves request for thermal treatment of one drum and one super sack of contaminated soil. The soil was generated during the September 2011 soil vapor probe installation.

Robert Weimer

11/4/2011

Document, Report, or Work plan Review - other

ADEC approves request for thermal treatment of one drum and one super sack of contaminated soil. The soil was generated during the September 2011 soil vapor probe installation.

Robert Weimer

2/6/2012

Document, Report, or Work plan Review - other

On September 12, 2011 two multi-level (at 8, 16, and 25 feet below ground surface) soil gas sampling wells were installed and sampled. Up to 0.29 mg/kg benzene, 0.19 mg/kg methylene chloride, 5.3 mg/kg GRO, and 54 mg/kg DRO in the soil samples collected. Up to 63 mg/m3 benzene, non-detect (<1.7 mg/m3) ethylbenzene, non-detect (<4.2 mg/m3) naphthalene, and non-detect (<1.7 mg/m3) xylenes in SVP-2 at 25 feet bgs. Up to non-detect (<1.3 mg/m3) benzene, non-detect (<1.7 mg/m3) ethylbenzene, non-detect (<4.2 mg/m3) naphthalene, and non-detect (<1.7 mg/m3) xylenes in SVP-1 at 25 feet bgs. The SVP-2 benzene exceeds Commerical Deep Soil Gas screening levels (1.6 mg/m3). The detection level for naphthalene exceeded Commerical Deep Soil Gas screening levels (0.36 mg/m3).

Robert Weimer

2/29/2012

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/28/12. Chevron is to continue semiannual groundwater monitoring and conduct soil gas sampling of SVP-1 and SVP-2 in the spring of 2012.

Robert Weimer

3/27/2012

Document, Report, or Work plan Review - other

June 9-10, 2011 groundwater monitoring event. Up to 0.86 mg/l GRO and 16 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.96 to 29.39 feet below ground surface. Monitoring wells MW-8 and MW-9 were decommissioned in accordance with the approved plan. The consultant recommends continued semi-annual groundwater monitoring.

Robert Weimer

8/21/2012

Offsite Soil or Groundwater Disposal Approved

ADEC approves offsite treatment of contaminated purge water.

Robert Weimer

11/28/2012

Offsite Soil or Groundwater Disposal Approved

ADEC approves offsite treatment of contaminated purge water.

Robert Weimer

1/30/2013

Document, Report, or Work plan Review - other

September 18, 2011 groundwater monitoring event. Up to 0.84 mg/l GRO and 20 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is historically to the northwest.

Robert Weimer

1/30/2013

Document, Report, or Work plan Review - other

May 30, 2012 groundwater monitoring event. Up to 0.80 mg/l GRO and 25 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction was to the northwest. Depth to groundwater was 25.99 to 28.45 feet below ground surface.

Robert Weimer

1/30/2013

Document, Report, or Work plan Review - other

September 19, 2012 groundwater monitoring event. Up to 0.41 mg/l GRO and 31 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.31 to 28.7 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring.

Robert Weimer

2/19/2013

Document, Report, or Work plan Review - other

On May 30, 2012 two multi-level (at 8, 16, and 25 feet below ground surface) soil gas sampling wells were sampled. Up to 21 mg/m3 benzene, non-detect (<8.7 mg/m3) ethylbenzene, non-detect (<21 mg/m3) naphthalene, and non-detect (<8.7 mg/m3) xylenes in SVP-2 at 25 feet bgs. Up to non-detect (<6.4 mg/m3) benzene, 9.2 mg/m3 ethylbenzene, non-detect (<21 mg/m3) naphthalene, and 20 mg/m3 xylenes in SVP-1 at 25 feet bgs. The SVP-2 benzene and SVP-1 ethylbenzene exceeds Commerical Deep Soil Gas screening levels (1.6 mg/m3 and 4.9 mg/m3). The SVP-1 xylenes exceeds Residential Deep Soil Gas screening levels (10 mg/m3). The detection level for naphthalene exceeded Commerical Deep Soil Gas screening levels (0.36 mg/m3). They are to sample again in the fall of 2012.

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. The will conduct soil vapor sampling in March 2013 and September 2013. 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

3/21/2013

Update or Other Action

The Department requests that soil gas sampling reports are provided on a semi-annual basis so a timely response can occur if the first monitoring event shows a problem or if there are QA/QC issues that would warrant another immediate soil vapor sampling event.

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

5/17/2013

Site Visit

Site visit to observe groundwater monitoring. They were collecting with no-purge with hydrasleeves and purge sampling with a bladder pump.

Robert Weimer

11/14/2013

Document, Report, or Work plan Review - other

On September 18, 2012 two multi-level (at 8, 16, and 25 feet below ground surface) soil gas sampling wells were sampled. The samples were non-detect (<64 mg/m3) benzene, (<87 mg/m3) ethylbenzene, (<100 mg/m3) naphthalene, and (<87 mg/m3) xylenes in SVP-2 at 25 feet bgs. The SVP-2 detection limit for benzene exceeds Commerical Deep Soil Gas screening levels (1.6 mg/m3). They need a frozen ground soil gas sampling event.

Robert Weimer

1/21/2014

Document, Report, or Work plan Review - other

May 16-17, 2013 groundwater monitoring event. Up to 2.0 mg/l GRO and 42 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction is to the west. Depth to groundwater is 26.31 to 28.43 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The monitoring wells were sampled by both no-purge with hydrasleeves, and purge with a bladder pump. The sampling interval for the bladder pump was not documented in the field notes. The hydrasleeve sampling was from the top of the water column.

Robert Weimer

2/19/2014

Document, Report, or Work plan Review - other

On March 28, 2013 two multi-level (at 8, 16, and 25 feet below ground surface) soil gas sampling wells were sampled. Up to 41 mg/m3 benzene, 11 mg/m3 toluene, non-detect (<8.7 mg/m3) ethylbenzene, non-detect (<21 mg/m3) naphthalene, and 11 mg/m3 xylenes in SVP-2 at 25 feet bgs. The SVP-2 benzene exceeds Commerical Deep Soil Gas screening levels (1.6 mg/m3). All other soil gas samples met Deep and Shallow Soil Gas screening levels.

Robert Weimer

2/20/2014

Document, Report, or Work plan Review - other

On September 16, 2013 two multi-level (at 8, 16, and 25 feet below ground surface) soil gas sampling wells were sampled. Up to 20 mg/m3 benzene, non-detect (<0.75 mg/m3) toluene, non-detect (<0.87 mg/m3) ethylbenzene, non-detect (<2.1 mg/m3) naphthalene, and non-detect (<0.87 mg/m3) xylenes in SVP-2 at 25 feet bgs. The SVP-2 benzene exceeds Commerical Deep Soil Gas screening levels (1.6 mg/m3). All other soil gas samples met Deep and Shallow Soil Gas screening levels.

Robert Weimer

2/27/2014

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/27/2014. They plan to continue semi-annual groundwater monitoring. They will submit a work plan for the removal of the soil gas probes. 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. In the future they will need to evaluate for a diving plume on the monitoring wells far from the release point. 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

4/24/2014

Document, Report, or Work plan Review - other

DEC provided comments on the proposed Soil Vapor Probe Decommission Work Plan for this site. The probes need to be decommissioned using methods similar to the monitoring well decommissioning section of the ADEC September 2013 Monitoring Well Guidance. This includes knocking out the bottom of the probe and filling with a grout or bentonite chips to near the ground surface as the probe casing is removed. Chips will require hydration after completion.

Robert Weimer

4/28/2014

Document, Report, or Work plan Review - other

DEC approved revised Soil Vapor Probe Decommission Work Plan for this site. The probes are to be decommissioned using methods similar to the monitoring well decommissioning section of the ADEC September 2013 Monitoring Well Guidance. This includes removing the teflon tubing and filling the hole with hydrated bentonite chips to near the ground surface after the tubing is removed.

Robert Weimer

5/9/2014

Document, Report, or Work plan Review - other

September 16, 2013 groundwater monitoring event. Up to 1.4 mg/l GRO and 23 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.66 to 28.11 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The monitoring wells were sampled by no-purge with hydrasleeves. The hydrasleeve sampling was from the top of the water column.

Robert Weimer

3/5/2015

Document, Report, or Work plan Review - other

November 6, 2013 groundwater monitoring event. Up to 2.1 mg/l GRO and 12 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.95 to 27.88 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The monitoring wells were sampled by purge with bladder pump from the top of the water column.

Robert Weimer

3/26/2015

Document, Report, or Work plan Review - other

May 5, 2014 groundwater monitoring event. Up to 2.6 mg/l GRO and 15 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.94 to 28.36 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. The monitoring wells were sampled by purge with bladder pump. The sample results are considered biased low because the pump intake was not within the top foot of the water column in all 6 monitoring wells, they ranged from 1.9 to 2.06 feet below the soil/water interface.

Robert Weimer

7/15/2015

Document, Report, or Work plan Review - other

Soil Vapor Probe Decommission report. The probes were decommissioned using methods similar to the monitoring well decommissioning section of the ADEC September 2013 Monitoring Well Guidance. This included removing the top two feet of teflon tubing and filling the hole with hydrated bentonite chips to near the ground surface after the tubing is removed.

Robert Weimer

8/17/2015

Conceptual Site Model Submitted

Review revised conceptual site model. Soil ingestion and direct contact, groundwater ingestion, and inhalation of outdoor air were identified as completed pathways.

Robert Weimer

1/25/2016

Update or Other Action

DEC approves extension request to submit the 2nd semi-annual 2015 groundwater monitoring report by February 29, 2016.

Robert Weimer

4/1/2016

Document, Report, or Work plan Review - other

April 28, 2015 groundwater monitoring event. Up to 0.66 mg/l GRO, non-detect MTBE, and 6.5 ug/l benzene in the groundwater. Contamination concentrations increased in 0 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.91 to 29.34 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.

Robert Weimer

6/16/2016

Document, Report, or Work plan Review - other

November 11, 2015 groundwater monitoring event. Up to 0.94 mg/l GRO, non-detect MTBE, and 11.0 ug/l benzene in the groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction is to the west. Depth to groundwater is 26.03 to 27.36 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required except for monitoring well MW-11 where it was not documented in the field notes.

Robert Weimer

2/1/2017

Document, Report, or Work plan Review - other

May 25, 2016 groundwater monitoring event. Up to 0.52 mg/l GRO and 3.0 ug/l benzene in the groundwater. Contamination concentrations increased in 0 of the 6 monitoring wells sampled. Groundwater flow direction is to the west by northwest. Depth to groundwater is 26.63 to 29.03 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.

Robert Weimer

10/31/2017

Document, Report, or Work plan Review - other

October 20, 2016 groundwater monitoring event. Up to 2.6 mg/l GRO and 46.0 ug/l benzene in the groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.97 to 28.42 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.

Robert Weimer

11/1/2017

Document, Report, or Work plan Review - other

June 23, 2017 groundwater monitoring event. Up to 2.7 mg/l GRO and 28.0 ug/l benzene in the groundwater. Contamination levels increased in 1 of the 6 monitoring wells sampled. Groundwater flow direction is to the west by northwest. Depth to groundwater is 26.04 to 28.46 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.

Robert Weimer

3/8/2018

Document, Report, or Work plan Review - other

October 11, 2017 groundwater monitoring event. Up to 7.8 mg/l GRO and 108.0 ug/l benzene in the groundwater. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.50 to 28.27 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.

Robert Weimer

3/14/2018

Update or Other Action

DEC approves suspending, until further notice, the sampling for GRO in monitoring wells 5 & 6. DEC requests that during the next monitoring event that all of the monitoring wells have samples analyzed for the full VOCs (method 8260) and PAHs (method 8270). Based on a review of the results of that sampling further reduction in groundwater monitoring may be approved.

Robert Weimer

10/9/2018

Document, Report, or Work plan Review - other

May 22, 2018 groundwater monitoring event. Up to 2.4 mg/l GRO, 16 ug/l naphthalene (1.7 ug/l cleanup level) and 19 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 26.09 to 28.52 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.

Robert Weimer

1/18/2019

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77946 1997 ust contamination.

Robert Weimer

7/2/2019

Document, Report, or Work plan Review - other

October 17, 2018 groundwater monitoring event. Up to 6.8 mg/l GRO and 87 ug/l benzene in the groundwater. PAH sampling was not conducted this sampling event. Contamination concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow direction is to the northwest. Depth to groundwater is 25.73 to 28.20 feet below ground surface. The consultant recommends continued semi-annual groundwater monitoring. After purging the monitoring wells were sampled with a bladder pump within the top foot of the water column as required.

Robert Weimer

9/23/2019

Update or Other Action

Robert Weimer

3/12/2020

Update or Other Action

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

Robert Weimer

3/17/2020

Document, Report, or Work plan Review - other

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

Robert Weimer

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

7/30/2021

Document, Report, or Work plan Review - other

2019 First Semi-Annual Groundwater Monitoring event was conducted on May 28, 2019. Well survey was completed on June 6, 2019. Groundwater samples were collected from monitoring wells MW-4, MW-5, MW-6, MW-7, MW-10, and MW-11. Samples were submitted to the laboratory for BTEX and GRO. Groundwater flow direction was to the west-northwest and depth to groundwater was 26.03 to 28.45 feet below ground surface.

Rebekah Reams

7/30/2021

Document, Report, or Work plan Review - other

2019 Second Semi-Annual Groundwater Monitoring event was conducted on October 9, 2019. Groundwater samples were collected from monitoring wells MW-4, MW-5, MW-6, MW-10, and MW-11. MW-7 was not sampled due to sediment in the well that clogged sampling equipment. Samples were submitted to the laboratory for BTEX and GRO. Groundwater flow direction was to the northwest and depth to groundwater was 25.95 to 28.38 feet below ground surface.

Rebekah Reams

7/30/2021

Document, Report, or Work plan Review - other

2020 First Semi-Annual Groundwater Monitoring event was conducted on May 7, 2020. Groundwater samples were collected from monitoring wells MW-6, MW-10, and MW-11. MW-4 was not sampled due access issues and MW-5 and MW-7 were not sampled due to ice obstructions within the well casing. Samples were submitted to the laboratory for GRO, VOCs and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 26.41 to 28.21 feet below ground surface.

Rebekah Reams

7/30/2021

Document, Report, or Work plan Review - other

2020 Second Semi-Annual Groundwater Monitoring event was conducted on November 11th and 19th, 2020. Groundwater samples were collected from monitoring wells MW-4 through MW-7 and MW-10. MW-11 was inaccessible due to ice cover. Samples were submitted to the laboratory for GRO, VOCs and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 25.92 to 28.31 feet below ground surface.

Rebekah Reams

8/4/2021

Long Term Monitoring Workplan or Report Review

2021 First Semi-Annual Groundwater Monitoring event was conducted on May 10, 2021. Groundwater samples were collected from monitoring wells MW-4, MW-6, MW-7, MW-10, and MW-11. MW-5 was frozen over and could not be sampled. Samples were submitted to the laboratory for GRO, VOCs and PAHs. Groundwater flow direction was to the west-northwest and depth to groundwater was 26.02 to 28.44 feet below ground surface.

Rebekah Reams

1/26/2022

Long Term Monitoring Workplan or Report Review

2021 Second Semi-Annual Groundwater Monitoring event was conducted on October 4, 2021. Groundwater samples were collected from monitoring wells MW-4 through MW-7, MW-10, and MW-11. Samples were submitted to the laboratory for GRO, VOCs and PAHs. Groundwater flow direction was to the northwest and depth to groundwater was 25.67 to 27.55 feet below ground surface.

Rebekah Reams

7/14/2022

Long Term Monitoring Workplan or Report Review

2022 First Semi-Annual Groundwater Monitoring event was conducted on May 3, 2022. Groundwater samples were collected from monitoring wells MW-4 through MW-7, MW-10, and MW-11. Samples were submitted to the laboratory for GRO, VOCs and PAHs. Groundwater flow direction was to the northwest and depth to groundwater was 25.40 to 27.81 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

4/3/2023

Long Term Monitoring Workplan or Report Review

2022 Second Semi-Annual Groundwater Monitoring event was conducted on August 24, 2022. Groundwater samples were collected from monitoring wells MW-4 through MW-7, MW-10, and MW-11. Samples were submitted to the laboratory for GRO, VOCs and PAHs. No groundwater cleanup levels exceedances were observed during this sampling event. Groundwater flow direction was to the west-northwest and depth to groundwater was 24.88 to 27.35 feet below ground surface.

Rebekah Reams

4/3/2023

Long Term Monitoring Established

ADEC approved the Groundwater Sampling Analyte Reduction Request – Groundwater Sampling Work Plan Addendum which proposes to update the groundwater monitoring schedule to include analysis for GRO, BTEX, naphthalene, 1,2,4-trimethylbenzene, and 1,3,5-trimethylbenzene at monitoring wells MW-4, MW-6, MW-7, and MW-11 on a semi-annual basis.

Rebekah Reams

6/23/2023

Long Term Monitoring Workplan or Report Review

2023 First Semi-Annual Groundwater Monitoring event was conducted on April 24, 2023. Groundwater samples were collected from monitoring wells MW-4, MW-6, MW-7, and MW-11. Samples were submitted to the laboratory for GRO and select VOCs. No groundwater cleanup levels exceedances were observed during this sampling event. Groundwater flow direction was to the west-northwest and depth to groundwater was 25.96 to 28.54 feet below ground surface.

Rebekah Reams

10/30/2023

Long Term Monitoring Workplan or Report Review

2023 Second Semi-Annual Groundwater Monitoring event was conducted on September 11, 2023. Groundwater samples were collected from monitoring wells MW-4, MW-6, MW-7, and MW-11. Samples were submitted to the laboratory for GRO and select VOCs. Ethylbenzene and naphthalene exceedances were observed during this sampling event. Groundwater flow direction was to the west-northwest and depth to groundwater was 24.90 to 27.35 feet below ground surface.

Rebekah Reams

5/30/2024

Long Term Monitoring Workplan or Report Review

2024 First Semi-Annual Groundwater Monitoring event was conducted on April 15, 2024. Groundwater samples were collected from monitoring wells MW-4, MW-6, and MW-7. MW-11 was frozen and could not be gauged or sampled. Samples were submitted to the laboratory for GRO and select VOCs. No groundwater cleanup levels exceedances were observed during this sampling event. Groundwater flow direction was to the west-northwest and depth to groundwater was 25.76 to 28.19 feet below ground surface.

Rebekah Reams

9/24/2024

Site Visit

ADEC conducted a site visit with Chevron and Arcadis personnel to observe site layout, sampling locations, and nearby features.

Rebekah Reams

9/25/2024

Meeting or Teleconference Held

ADEC staff met with Chevron and their consultant for an annual portfolio meeting to discuss site status, upcoming document submittals, pending reviews, and general updates for Chevron's contaminated sites throughout the state.

Rebekah Reams

10/15/2024

Long Term Monitoring Workplan or Report Review

2024 Second Semi-Annual Groundwater Monitoring event was conducted on August 12, 2024. Groundwater samples were collected from monitoring wells MW-4, MW-6, MW-7. and MW-11. Samples were submitted to the laboratory for GRO and select VOCs. Ethylbenzene, total xylenes, naphthalene, and 1,2,4-trimethylbenzene exceedances were observed during this sampling event. Groundwater flow direction was to the west-northwest and depth to groundwater was 24.02 to 26.45 feet below ground surface.

Rebekah Reams

10/31/2024

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77946 1997 ust contamination.

Rebekah Reams

11/12/2024

Document, Report, or Work plan Review - other

ADEC approved the Conceptual Site Model and Site Investigation Work Plan following comment resolution. This document summarizes site history, evaluates exposure pathways, identifies data gaps, and proposes to advance 14 soil borings and one monitoring well to evaluate current contaminant concentrations and determine the extent of contamination at the site.

Rebekah Reams

Contaminant Information

Name

Level Description

Media

Comments

Control Type

Type

Details

Requirements

Description

Details

1999 Site Assessment Report

1997 Results of Soil and Groundwater Assessment Program

1999 Well Abandonment and Removal of USTs and Product Lines

2002 First Semi-Annual Groundwater Monitoring Report

2007 Subsurface Investigation Report

2009 Remedial Action Report

2010 Initial Vapor Intrusion Report

2003 Well Installation Report

2015 Conceptual Site Model

2014 Soil Vapor Decommissioning Report

2012 Soil Vapor Assessment Report

2019 Second Semi-Annual Groundwater Monitoring Report

2019 First Semi-Annual Groundwater Monitoring Report

No associated sites were found.

Missing Location Data

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Alaska Department of Environmental Conservation

Site Report: Chevron 9-6489 - Triple A Service

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

1999 Site Assessment Report

1997 Results of Soil and Groundwater Assessment Program

1999 Well Abandonment and Removal of USTs and Product Lines

2002 First Semi-Annual Groundwater Monitoring Report

2007 Subsurface Investigation Report

2009 Remedial Action Report

2010 Initial Vapor Intrusion Report

2003 Well Installation Report

2015 Conceptual Site Model

2014 Soil Vapor Decommissioning Report

2012 Soil Vapor Assessment Report

2019 Second Semi-Annual Groundwater Monitoring Report

2019 First Semi-Annual Groundwater Monitoring Report

Missing Location Data

State of Alaska Department of Environmental Conservation