Site Report: Chevron - #1356

Site Name:	Chevron - #1356
Address:	1465 West Northern Lights Boulevard, Anchorage, AK 99501
File Number:	2100.26.065
Hazard ID:	23313
Status:	Active
Staff:	Rebekah Reams, 9074512144 rebekah.reams@alaska.gov
Latitude:	61.195589
Longitude:	-149.912500
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

Service station began operations in 1970. Samples taken during the May 1999 UST removals revealed DRO and HVOCs beneath the used oil and heating oil USTs. GRO was detected beneath the gasoline tanks and associated product lines. After excavation, nine areas still exceeded soil cleanup levels (up to 417 mg/kg benzene and 12,000 mg/kg GRO) and ground water contamination remain, some near the active UST system. 1,500 tons of excavated contaminated soil was treated at ASR in 1999. Later in 1999 four monitoring wells were installed (up to 3 mg/kg benzene and 929 mg/kg GRO at the soil/water interface in two of the monitoring wells). Two more monitoring wells were installed in 2001 off property to the south and west. Chevron continues to monitor the groundwater at the site. A Phase I assessment noted that the property was used as a dry cleaner in the 1960's (Snow White Cleaners was there in 1969, and another dry cleaner company in 1963).

Action Information

Action Date	Action	Description	DEC Staff
5/25/1998	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 78013 Stockpile analytical results sent to ADEC via e-mail revealed gasoline and HVOCs in soils.	Former Staff
5/25/1998	Site Added to Database		Former Staff
8/11/1998	Underground Storage Tank Site Characterization or Assessment	Secor submits UST Removal/Site Assessment Report dated 8/6/98. Groundwater not encountered. Nine areas after excavation exceed soil cleanup levels (up to 417 mg/kg benzene and 12,000 mg/kg GRO).	Former Staff
8/11/1998	Document, Report, or Work plan Review - other	Secor submits release investigation workplan. Workplan includes the installation of 4 groundwater monitoring wells to assess the vertical and lateral extent of impacted soil and groundwater at the site.	Former Staff
8/11/1998	Leaking Underground Storage Tank Cleanup Initiated - Petroleum		Former Staff
8/11/1998	Leaking Underground Storage Tank Corrective Action Underway	1,575 tons of excavated soil exceeding cleanup levels is transported to Alaska Soil Recycling for thermal treatment.	Robert Weimer
6/15/1999	Site Characterization Workplan Approved	ADEC approves 8/06/98 Release Investigation work plan with some minor revisions. HVOC and PAH testing has been added.	Former Staff
7/1/1999	Underground Storage Tank Site Characterization or Assessment	On 7/1/99 four monitoring wells were installed and soil and groundwater samples were collected. Soil contamination above cleanup levels was encountered at the soil water interface (17 feet below ground surface) in monitoring wells MW-2 and MW-3 (up to 3 mg/kg benzene and 929 mg/kg GRO). Up to 7.14 mg/l GRO, 64 ug/l benzene, and non-detect (<100 ug/l) MTBE in the groundwater.	Robert Weimer
1/30/2001	Meeting or Teleconference Held	Annual meeting with ADEC & Chevron reps to review AK sites and set goals for 2001.	Linda Nuechterlein
4/18/2001	Site Characterization Workplan Approved	Letter sent to Chevron approving installation of two monitoring wells at this site.	Linda Nuechterlein
9/5/2001	Underground Storage Tank Site Characterization or Assessment	On 9/5/01 two additional monitoring wells (MW5 and MW6) were across the street to the south and west of the site. One soil sample was collected from each soil boring at 10 feet below ground surface (bgs) and they were non-detect, but higher contamination levels may exist since a soil sample was not collected at the soil/water interface (14 feet bgs) and in MW5 the highest field reading depth was not sampled (14 feet bgs).	Robert Weimer
8/21/2002	Update or Other Action	RECKEY has automatically been generated.	Cynthia Pring-Ham
9/16/2003	Update or Other Action	Approved reduction in groundwater monitoring.	Robert Weimer
8/5/2004	Document, Report, or Work plan Review - other	June 2, 2004 groundwater sampling. Up to 14 mg/l GRO and 18 ug/l benzene. Contamination concentrations appear to be stable.	Robert Weimer
12/7/2004	Document, Report, or Work plan Review - other	September 22, 2004 groundwater sampling. Up to 10 mg/l GRO and 73 ug/l benzene. Contamination concentrations appear to be stable.	Robert Weimer
7/19/2005	Document, Report, or Work plan Review - other	May 11, 2005 groundwater sampling. Up to 7 mg/l GRO and 4 ug/l benzene. Contamination concentrations appear to be decreasing. Groundwater flows to the southwest.	Robert Weimer
11/28/2005	Document, Report, or Work plan Review - other	September 22, 2005 groundwater sampling. Up to 6 mg/l GRO and 30 ug/l benzene in the groundwater. Contamination concentrations appear to be increasing. Groundwater flows to the southwest. Depth to groundwater is 12 to 14 feet below ground surface.	Robert Weimer
1/10/2006	Meeting or Teleconference Held	Meeting with RP's consultant to discuss future site work. Needed additional monitoring well to southwest. Possible vac pump of groundwater. Need drinking water well search.	Robert Weimer
5/11/2006	Meeting or Teleconference Held	Meeting with RP and their consultant to discuss future site work. They are looking at access to install monitoring well to the southwest. They are currently conducting the sensitive receptor study.	Robert Weimer
6/27/2006	Site Characterization Workplan Approved	ADEC approves work plan to install one more monitoring well to the south west of the Chevron property.	Robert Weimer
7/20/2006	Document, Report, or Work plan Review - other	May 9, 2006 groundwater sampling event. Up to 0.84 mg/l GRO and 4.7 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flows to the southwest. Depth to groundwater is 14.1 to 16.2 feet below ground surface. EDB and 1,2-DCA were both non-detect (< 0.5 ug/l).	Robert Weimer
9/8/2006	Offsite Soil or Groundwater Disposal Approved	ADEC approves the thermal treatment of two drums of contaminated soil.	Robert Weimer
11/1/2006	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	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
5/15/2007	Document, Report, or Work plan Review - other	September 20, 2006 groundwater sampling event. Up to 1.3 mg/l GRO and 13 ug/l benzene in the groundwater. Contamination concentrations appear to be increasing. Groundwater flows to the southwest. Depth to groundwater is 12.3 to 15.7 feet below ground surface.	Robert Weimer
11/5/2007	Document, Report, or Work plan Review - other	Reviewed sensitive receptor and well survey report. Ten past domestic water well were identified within 1/4 mile of the site. They all appear to be upgradient or cross gradient from the site. All parcels in the area are commercial slab on grade without basements.	Robert Weimer
11/21/2007	Release Investigation	On July 12, 2006 an additional monitoring well was installed to the southwest across the intersection to help define the extent of the soil and groundwater contamination for this site. All soil samples were non-detect, but the detection limit for benzene was 0.1 mg/kg (which is above the benzene default cleanup level of 0.02 mg/kg). Groundwater was encountered at 14.5 feet below ground surface.	Robert Weimer
1/9/2008	Document, Report, or Work plan Review - other	May 15, 2007 groundwater sampling event. Up to 0.2 mg/l GRO and 2 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flows to the southwest. Depth to groundwater is 12.81 to 15.32 feet below ground surface.	Robert Weimer
1/18/2008	Conceptual Site Model Submitted	Review preliminary conceptual site model.	Robert Weimer
2/8/2008	Document, Report, or Work plan Review - other	September 23, 2007 groundwater sampling event. Up to 0.2 mg/l GRO and 3 ug/l benzene, and non-detect (<3 ug/l) MTBE in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flows to the west by northwest. Depth to groundwater is 12.66 to 16.04 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 will continue oxygen and ozone injection in the source area monitoring wells.	Robert Weimer
4/21/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of 60 gallons of contaminated purge water.	Robert Weimer
5/6/2008	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
8/4/2008	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
12/17/2008	Document, Report, or Work plan Review - other	May 5, 2008 groundwater sampling event. Up to 1.51 mg/l GRO and 8.84 ug/l benzene, and non-detect (<3 ug/l) MTBE in the groundwater. Contamination concentrations increased in 1 of the 4 monitoring wells sampled. Groundwater flows to the west by southwest. Depth to groundwater is 12.74 to 16.22 feet below ground surface. Monitoring well MW-5 appears to have been paved over.	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 is to continue to sample monitoring well MW6 and MW7. Need confirmation soil samples prior to evaluating site for cleanup complete. Up to 12,000 mg/kg GRO and 3 mg/kg benzene left in 1998 and 1999 (MW), many of the locations are not near the existing UST system.	Robert Weimer
2/27/2009	Document, Report, or Work plan Review - other	July 16, 2008 groundwater sampling event. Up to 0.20 mg/l DRO, 0.80 mg/l GRO and 6.0 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 12.64 to 16.17 feet below ground surface. Monitoring well MW-5 appears to have been paved over.	Robert Weimer
6/16/2009	Site Visit	Site visit to observe groundwater sampling.	Robert Weimer
10/27/2009	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of 1 drum of contaminated purge water.	Robert Weimer
11/6/2009	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of 1 drum of contaminated purge water.	Robert Weimer
11/24/2009	Document, Report, or Work plan Review - other	June 16, 2009 groundwater sampling event. Up to 0.091 mg/l DRO, 0.25 mg/l GRO and 2.9 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 12.85 to 16.40 feet below ground surface. Monitoring well MW-5 appears to have been paved over.	Robert Weimer
1/4/2010	Document, Report, or Work plan Review - other	August 27, 2009 groundwater sampling event. Up to 0.25 mg/l DRO, 0.43 mg/l GRO and 3.4 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater flows to the southwest. Depth to groundwater is 12.81 to 16.35 feet below ground surface. Monitoring well MW-5 appears to have been paved over.	Robert Weimer
3/11/2010	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 3/10/10. MW3 is to be sampled for PAH the next monitoring event. Chevron will submit a workplan for confirmation soil samples. 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
7/14/2010	Site Visit	Site visit to observe soil borings and soil sample collection by CRA consulting. Samplers include Andy Ellsmore, Tim Bunn, and Siobahn Fackelman.	Brenton Porter
7/30/2010	Update or Other Action	DEC receives notification that for the 7/14/10 soil confirmation sampling the bar-codes on the sample jars got damaged and the lab could not retrieve the weight of the jar. An average weight of the batch of jars was used to calculate the results. They propose to redo the sampling work on September 5th. DEC contacted the consultant and said that resampling would not be needed if they provide documentation of the range of weight of jars. DEC will review whether the range in weight was significant enough to elevate the sample results over site cleanup levels. This would result in the savings of thousands of dollars of resampling costs.	Robert Weimer
8/4/2010	Update or Other Action	DEC receives documentation of the range of weight of jars from the 7/14/10 confirmation soil sampling. The range in weight was not significant enough to elevate the sample results over site cleanup levels. Resampling is not required.	Robert Weimer
8/23/2010	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
10/25/2010	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of 1 drum of contaminated decontamination water.	Robert Weimer
11/16/2010	Document, Report, or Work plan Review - other	May 6, 2010 groundwater sampling event. Up to 0.03 mg/l GRO and non-detect DRO and benzene in the groundwater samples collected. Contamination concentrations decreased in 4 of the 4 monitoring wells sampled. Groundwater flows to the southwest. Depth to groundwater is 14.25 to 16.57 feet below ground surface. Monitoring well MW-5 appears to have been paved over. Monitoring well MW-2 was sampled for PAH's and those were all non-detect.	Robert Weimer
11/17/2010	Offsite Soil or Groundwater Disposal Approved	Approved transport and disposal of 1 drum and 3 super sacks of contaminated soil at the Columbia Ridge Landfill in Arlington, Oregon. The soil was generated during the July/August 2010 subsurface investigation.	Robert Weimer
3/14/2011	Document, Report, or Work plan Review - other	August 5, 2010 groundwater sampling event. Up to 1.1 mg/l DRO, 0.024 mg/l GRO, non-detect EDB, and 2.7 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 3 monitoring wells sampled. Groundwater flows to the southwest. Depth to groundwater is 13.98 to 15.38 feet below ground surface.	Robert Weimer
4/8/2011	Update or Other Action	ADEC reviewed request for reduction in groundwater monitoring at this site to annual. Based on the elevated soil contamination concentrations (up to 1,300 mg/kg GRO and 1.6 mg/kg benzene) identified as remaining at the site from the 2010 Subsurface Investigation, ADEC requested continued semi-annual ground water monitoring at the site.	Robert Weimer
5/19/2011	Site Visit	Site visit to observe the collection of groundwater samples. Hydrasleeves were used to collect VOC samples and bailers used to collect non VOC samples.	Robert Weimer
10/26/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of 1 drum of contaminated decontamination water.	Robert Weimer
2/6/2012	Document, Report, or Work plan Review - other	Between July 14, 2010 and August 5, 2010 eight soil borings were sampled to check current contamination concentrations in the soil at the site. Up to 1,300 mg/kg GRO (300 mg/kg cleanup level), 0.063 mg/kg tetrachloroethane (PCE) (0.024 mg/kg cleanup level), and 1.6 mg/kg benzene (0.025 mg/kg cleanup level) was identified as remaining at the site. Four of the eleven locations sampled exceeded cleanup levels for benzene, and two locations exceeded cleanup levels for GRO. The highest concentrations were in the soil/water interface at 16 feet below ground surface (bgs) on the south side of the property just east of monitoring well MW-3. The PCE contamination is located at 8 feet bgs near the former used oil tank.	Robert Weimer
3/1/2012	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 to submit a workplan for conducting a release investigation for the PCE soil contamination at SB1 that is to inlude the installation of a monitoring well in that area. After a review of the results of the release investigation they may need to collect soil gas samples. They are to continue semi-annual groundwater monitoring.	Robert Weimer
7/13/2012	Document, Report, or Work plan Review - other	The Well Installation Workplan is approved under the following conditions: 1. The soil and groundwater samples be analyzed for the full list of VOC’s (8260B), not just PCE. 2. An additional soil sample be collected at the highest field screening depth between 9 feet below ground surface (bgs) and the soil water interface. 3. That the vacuum truck be used to clear the borehole no greater than 6 feet bgs. 4. The soil sample collected at 8 to 9 feet bgs not be collected from auger cuttings. A spilt spoon or coring device needs to be used to collect an undisturbed sample. 5. The VOC and GRO groundwater samples be collected using a low flow submersible pump, bladder pump, or hydrasleeve.	Robert Weimer
8/17/2012	Offsite Soil or Groundwater Disposal Approved	ADEC approves offsite treatment of contaminated purge water.	Robert Weimer
12/20/2012	Document, Report, or Work plan Review - other	May 23, 2012 groundwater sampling event. Up to 0.5 mg/l DRO, 1.8 mg/l GRO, and 7.5 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 3 monitoring wells sampled. Groundwater flows to the southwest. Depth to groundwater is 13.49 to 16.11 feet below ground surface. Results are biased low because samples were not preserved in the field.	Robert Weimer
2/14/2013	Document, Report, or Work plan Review - other	July 31, 2012 groundwater sampling event. Up to 0.89 mg/l DRO, 2.9 mg/l GRO, non-detect (<0.5 ug/l) 1,2-DCA, 1.0 ug/l PCE, and 6.8 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 5 monitoring wells sampled. Monitoring well MW-2 has the highest GRO concentrations since 2005. Groundwater flows to the southwest. Depth to groundwater is 13.42 to 16.03 feet below ground surface.	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 next monitoring event they will sample all of the site monitoring wells (MW1-7 and 9) for HVOCs (method 8260). 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. Based on the HVOC sample results Chevron may need to do a vapor intrusion assessment.	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
5/21/2013	Update or Other Action	Consultant called to notify ADEC that the recent ground water samples were over temperature and outside holding times. They will have the samples analyzed and note in the report that those samples mat be biased low. ADEC will review the results of the split samples to determine if another split sample event will be needed.	Robert Weimer
6/27/2013	Site Visit	Site visit to observe current site conditions.	Robert Weimer
1/2/2014	Document, Report, or Work plan Review - other	On July 23, 2013 monitoring well MW-9 was installed and sampled. MW-9 is located just to the west of soil boring SB-1 that had 0.063 mg/kg PCE at 8 feet bgs when it was sampled on August 5, 2010. Soil samples were collected and analyzed at 9, 12, and 17 feet bgs. Groundwater was encountered at 17 feet bgs. Up to 0.24 mg/kg PCE, non-detect (<0.6 mg/kg) GRO, and non-detect (<0.033 mg/kg) benzene in the soil samples collected. The highest concentration was at 9 feet bgs. The soil sample collected at the soil/water interface had 0.06 mg/kg PCE. The consultant recommends that all site monitoring wells be sampled for PCE. Because of the remaining PCE soil contamiantion next to the station building, soil gas, sub-slab, or indoor air sampling is needed to evaluate the indoor air pathway.	Robert Weimer
1/21/2014	Document, Report, or Work plan Review - other	May 23, 2013 groundwater sampling event. Up to 1.5 mg/l DRO, 1.7 mg/l GRO, 46 ug/l PCE, and 8.5 ug/l benzene in the groundwater. Samples may be biased low because samples were over temperature and analyzed outside of holding times. Contamination levels increased in 5 of the 7 monitoring wells sampled. Groundwater flows to the north. Depth to groundwater is 12.12 to 15.72 feet below ground surface. Groundwater samples were collected 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. Monitoring well MW3 had 4.4 ug/l benzene with purge, but 8.5 ug/l benzene with no-purge. Monitoring well MW2 had 0.75 mg/l DRO, 1.7 mg/l GRO, and 46 ug/l PCE with purge, but 1.5 mg/l DRO, 0.43 mg/l GRO, and 18 ug/l PCE with no-purge.	Robert Weimer
2/13/2014	Document, Report, or Work plan Review - other	September 17-18, 2013 groundwater sampling event. Up to 1.8 mg/l DRO, 0.68 mg/l GRO, 24 ug/l PCE, and 1.3 ug/l benzene in the groundwater. Contamination concentrations increased in 7 of the 7 monitoring wells sampled. Groundwater flows to the northeast. Depth to groundwater is 11.57 to 15.75 feet below ground surface. Groundwater samples were collected by no-purge with hydrasleeves at the top of the water column.	Robert Weimer
2/20/2014	Update or Other Action	Vapor Intrusion Evaluation Report - PCE in soil and groundwater above cleanup levels within 30 feet of the station building. Consultant recommends VI investigation in 2014, with a work plan to be submitted in the spring of 2014.	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 including HVOC's. They will submit a work plan for the installation of soil vapor probes and soil gas sampling. 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. 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
4/29/2014	Document, Report, or Work plan Review - other	DEC provided review comments on proposed soil vapor probe installation work plan 1. Need three soil gas sample locations per building. 2. Why 9 feet depth to top of well screen? Depths and locations should be based on building survey. If slab on grade building the top of the screen should be 5 feet below ground surface. 3. Need to discuss how you will measure helium to ensure leak test passes. Need to measure helium under the shroud or container as well as at end of sample train during purging. 4. Need to provide more detail regarding collection of duplicate sample. Ideally a duplicate and primary summa will both be attached in-line to sample train and thus, soil gas samples will be collected simultaneously. 5. If vac truck or air knife is used within 5 feet vertically or horizontally of a soil probe screen interval then need to wait at least 1 week before collecting soil gas sampling instead of the 48 hours proposed in the work plan. 6. No soil analytical samples are requested as part of the soil gas probe installation. 7. Need a completed building survey form with the report, but need item #5 information on the form for the work plan.	Robert Weimer
5/1/2014	Document, Report, or Work plan Review - other	DEC reviewed revised soil vapor assessment work plan. The Chevron building is slab on grade, three soil gas probes are to be installed with a screened interval starting at 5 feet below ground surface. The revised work plan is approved under the condition that helium is also measured at the end of the sample train during purging. Probes are to be installed on 5/2/2014 and to be sampled one or two weeks later.	Robert Weimer
5/5/2014	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
7/21/2014	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of drill cuttings and decon water from site work done on 7/23/12.	Robert Weimer
7/28/2014	Document, Report, or Work plan Review - other	ADEC approves temporary storage of 3 drum of drill cuttings at the secure area at 1441 C Street. The cuttings were generated during the soil vapor probe installation in May 2014.	Robert Weimer
9/5/2014	Document, Report, or Work plan Review - other	Phase I assessment identified that a drying cleaning businesses operating on this property in the 1960's, including Snow White Cleaners in a 1969 listing. The service station underground storage tanks were installed in 1970.	Robert Weimer
9/8/2014	Update or Other Action	Updated the address for this site from 1456 West Northern Lights Blvd. to 1465 West Northern Lights Blvd.	Robert Weimer
11/13/2014	Conceptual Site Model Submitted	Conceptual site model identified soil/groundwater soil ingestion and inhalation of indoor/outdoor air pathways.	Robert Weimer
2/10/2015	Document, Report, or Work plan Review - other	May 1, 2014 groundwater sampling event. Up to 0.54 mg/l DRO, 1.6 mg/l GRO, 32 ug/l PCE, and 4.8 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 7 monitoring wells sampled. Groundwater flows to the north this monitoring event. Depth to groundwater was 12.40 to 15.82 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. Because the bladder pump intake was not within the top foot of the water column (it was 1.98 to 2.04 feet below the water surface) the results are considered biased low.	Robert Weimer
4/27/2015	Document, Report, or Work plan Review - other	September 23, 2014 groundwater sampling event. Up to 0.48 mg/l DRO, 1.2 mg/l GRO, 51 ug/l PCE, and 5.2 ug/l benzene in the groundwater. Contamination concentrations increased in 7 of the 7 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 11.76 to 15.44 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. Because the bladder pump intake was not within the top foot of the water column (it was 1.97 to 2.01 feet below the water surface) or it was not documented (MW-2) the results are considered biased low.	Robert Weimer
4/27/2015	Document, Report, or Work plan Review - other	ADEC concurs with April 2015 Groundwater Monitoring and Sampling Work Plan recommendation to reduce groundwater monitoring to semi-annual for the 7 site monitoring wells for HVOCs and (GRO/DRO/BTEX) in monitoring wells MW-2, MW-3, MW-6, MW-7, and MW-9.	Robert Weimer
9/18/2015	Document, Report, or Work plan Review - other	On May 2, 2014 three soil gas probes were installed with a screened interval starting at 5 feet below ground surface. On July 28, 2014 the three soil gas probes were sampled after purging 3 to 5 volumes of air. Up to 10 mg/m3 PCE in the samples collected which exceeds the residential screening level of 0.41 mg/m3 and commercial screening level of 1.8 mg/m3. They plan to conduct another sampling event in early 2015 during frozen ground conditions.	Robert Weimer
9/22/2015	Document, Report, or Work plan Review - other	On February 2, 2015 the three soil gas probes were sampled after purging 3 to 5 volumes of air. Up to 2.1 mg/m3 PCE in the samples collected which exceeds the residential screening level of 0.41 mg/m3 and commercial screening level of 1.8 mg/m3. The results were flagged as estimated by the laboratory. This result was lower than the 10 mg/m3 detect during the July 2014 sampling event.	Robert Weimer
2/3/2016	Offsite Soil or Groundwater Disposal Approved	DEC approves of request to dispose of 3 drums of contaminated drill cuttings at WMI's Arlington Landfill. The drill cuttings were generated during the June 12, 2015 soil vapor probe installation work.	Robert Weimer
4/6/2016	Document, Report, or Work plan Review - other	May 3, 2015 groundwater sampling event. Up to 1.2 mg/l DRO, 2.8 mg/l GRO, 11 ug/l PCE, 0.8 ug/l 1,2-DCA, and 7.0 ug/l benzene in the groundwater. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 12.73 to 16.22 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required.	Robert Weimer
6/2/2016	Document, Report, or Work plan Review - other	November 4, 2015 groundwater sampling event. Up to 0.57 mg/l DRO, 1.4 mg/l GRO, 40 ug/l PCE, non-detect ug/l 1,2-DCA, and 5.0 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 13.16 to 15.78 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required.	Robert Weimer
2/27/2017	Update or Other Action	DEC approves, until further notice, suspending sampling of monitoring wells MW-1 and MW-4. DEC requests that the next groundwater monitoring event include full PAHs (8270) and full VOCs (8260) along with normal HVOCs and (GRO/DRO/BTEX) sampling in monitoring wells MW-2, MW-3, MW-6, MW-7, and MW-9.	Robert Weimer
2/27/2017	Document, Report, or Work plan Review - other	April 20, 2016 groundwater sampling event. Up to 1.4 mg/l DRO, 2.7 mg/l GRO, 12 ug/l PCE, non-detect ug/l 1,2-DCA, and 8.0 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 7 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 12.78 to 16.34 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required.	Robert Weimer
6/29/2017	Document, Report, or Work plan Review - other	October 27-28, 2016 groundwater sampling event. Up to 0.34 mg/l DRO, 0.64 mg/l GRO, 3 ug/l PCE, 0.9 ug/l 1,2-DCA, and 5.0 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 7 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 12.80 to 16.35 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required.	Robert Weimer
1/23/2018	Document, Report, or Work plan Review - other	May 2, 2017 groundwater sampling event. Up to 0.61 mg/l DRO, 1.3 mg/l GRO, 15 ug/l PCE, 16 ug/l Chloroform (not in trip blank), and 2.0 ug/l benzene in the groundwater. Some PAHs were detected. The samples were non-detect for MTBE, 1,2-DCA, and EDB. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 13.10 to 16.67 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required. Missing Naphthalene results for the 8260 analysis.	Robert Weimer
2/9/2018	Document, Report, or Work plan Review - other	October 12, 2017 groundwater sampling event. Up to 0.094 mg/l DRO, 0.26 mg/l GRO, 12 ug/l PCE, 0.6 ug/l TCE, 1.0 ug/l 1,2-cis DCA, 15 ug/l Chloroform (not in trip blank), and 1.0 ug/l benzene in the groundwater. PAH analysis was not conducted. Contamination concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flows to the northeast this monitoring event. Depth to groundwater was 11.35 to 16.72 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required. Missing Naphthalene results for the 8260 analysis.	Robert Weimer
7/16/2018	Document, Report, or Work plan Review - other	April 18, 2018 groundwater sampling event. Up to 0.029 mg/l GRO, 12 ug/l PCE, 0.6 ug/l TCE, 6 ug/l Chloroform (not in trip blank) in the groundwater. PAH analysis was not conducted. DRO and other VOCs were non-detect. Contamination concentrations increased in 2 of the 5 monitoring wells sampled. Groundwater flows to the northeast this monitoring event. Depth to groundwater was 13.10 to 16.59 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required. Missing Naphthalene results for the 8260 analysis.	Robert Weimer
1/17/2019	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 78013 1999 UST contamination.	Robert Weimer
5/9/2019	Document, Report, or Work plan Review - other	September 5, 2018 groundwater sampling event. Up to 0.34 mg/l GRO, 2 ug/l benzene, 13 ug/l PCE, 0.3 ug/l TCE, 3 ug/l cis-1,2-Dichloroethene, 3 ug/l Ethylbenzene, 0.2 ug/l Toluene, 2.7 ug/l Xylenes, 9 ug/l Chloroform (not in trip blank) in the groundwater. PAH analysis was not conducted. DRO and other VOCs were non-detect. Contamination concentrations increased in 3 of the 5 monitoring wells sampled. Groundwater flows to the northeast this monitoring event. Depth to groundwater was 12.68 to 16.19 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required. Missing Naphthalene results for the 8260 analysis.	Robert Weimer
5/15/2019	Update or Other Action	ADEC requested submittal of method 8260 naphthalene results that were not included for this and the previous 2018 groundwater sampling events. ADEC also requested for this and all GHD Chevron sites that laboratory 8260 VOC analysis include and report the naphthalene results and that they are included on monitoring event and historical data tables.	Robert Weimer
9/23/2019	Update or Other Action	ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also VOC sampling needs to include the full 8260 VOC list including naphthalene.	Robert Weimer
9/23/2019	Document, Report, or Work plan Review - other	ADEC approves suspending all GRO and DRO groundwater analysis for this site. For monitoring wells MW-2, MW-3, MW-6, MW-7, and MW-9 ADEC is requesting VOC sampling to include the full 8260 VOC list including naphthalene.	Robert Weimer
11/5/2019	Meeting or Teleconference Held	Meeting with Chevron's consultant. They will provide an updated site figure showing estimated extent of soil contamination for each of the following: over maximum allowable, over human health, and over migration to groundwater. May need confirmation soil sampling to document current concentrations. They will provide a work plan for conducting additional vapor intrusion assessment during frozen and non-frozen ground conditions. DEC requested that site reports be submitted within 60 days of sampling, VOC analysis include naphthalene, and groundwater monitoring figure include diagram showing historic groundwater flow direction.	Robert Weimer
1/8/2020	Document, Report, or Work plan Review - other	April 22, 2019 groundwater sampling event. Up to 0.13 mg/l DRO, 0.093 mg/l GRO, 0.3 ug/l benzene, 14 ug/l PCE, 0.8 ug/l TCE, 0.6 ug/l cis-1,2-Dichloroethene, 3 ug/l Ethylbenzene, 2.0 ug/l Toluene, 1.0 ug/l Xylenes, 11 ug/l Chloroform (not in trip blank) in the groundwater. PAH analysis was not conducted. DRO and other VOCs were non-detect. Contamination concentrations increased in 5 of the 5 monitoring wells sampled. Groundwater flows to the south by southwest this monitoring event. Depth to groundwater was 12.68 to 16.88 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were not collected from the top foot of the water column as required so the results may be biased low. Missing Naphthalene results for the 8260 analysis. They Naphthalene results have been requested.	Robert Weimer
2/19/2020	Document, Report, or Work plan Review - other	ADEC conditionally approves the January 21, 2020 Soil Vapor Investigation Work Plan for Chevron #91356, 1465 West Northern Lights Boulevard site. The condition is that the samples are analyzed for the full list of TO-15 compounds instead of just PCE as proposed. The work plan proposes to collect soil gas samples from the 3 existing soil vapor probes (SVP-1, SVP-2, and SVP-3) during frozen and non-frozen ground conditions in 2020.	Robert Weimer
3/12/2020	Update or Other Action	ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also all BTEX and VOC sampling needs to include the full 8260 VOC list including naphthalene. ADEC is also requesting that all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions.	Robert Weimer
3/17/2020	Document, Report, or Work plan Review - other	DEC reviewed 2020 groundwater sampling plan and provided the following comments: For all future monitoring events please make sure that the field notes document the measurement of the pump intake that is within the top foot of the water column at the time of the sampling unless the top of the well screened interval is deeper, then in that case from the top foot of that screened interval. For all future monitoring events any monitoring well where BTEX or HVOC sampling is proposed it needs to be the full VOC (method 8260) list, including naphthalene. The field QC samples are per day of sampling at a site. For all future monitoring events all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. For all future monitoring events if a monitoring well is low yield and purges dry then a sample will still need to be collected that monitoring event once the monitoring well has recharged to approximately 80% of its pre-purge volume. If it has not returned to 80% of its pre-purged volume during that sampling day DEC requests that you return to the site early the next day to attempt to collect the water sample.	Robert Weimer
1/11/2021	Document, Report, or Work plan Review - other	September 20, 2019 groundwater sampling. Monitoring wells MW-2, MW-3, MW-6, MW-7 and MW-9 were sampled and analyzed for GRO, DRO, BTEX, EDC, EDB, PCE, and chloroform. Monitoring well MW-8 was unable to be located and was not sampled. Toluene, EDB, and chloroform were detected in the equipment blank sample. Groundwater cleanup level exceedances during this monitoring event include chloroform up to 0.011 mg/L (not detected in trip blank) and vinyl chloride 0.27 ug/L (J flagged) at MW-7. Duplicate sample was collected from MW-9. Groundwater flow direction was to the west by southwest. Depth to groundwater was 11.84 to 15.92 feet below ground surface. Sample was collected with a bladder pump after purging with the sampling interval near the soil/water interface.	Rebekah Reams
1/11/2021	Document, Report, or Work plan Review - other	April 10, 2020 groundwater sampling. Monitoring wells MW-2 and MW-9 were sampled and analyzed for BTEX, MTBE, VOCs, EDC, EDB, PCE, chloroform, and naphthalene. Monitoring well MW-3 was unable to be located due to the presence of an ice berm so was not sampled and MW-6 and MW-7 were obstructed by ice and could not be sampled. The following analytes were detected above groundwater cleanup levels: up to 0.00601 mg/L naphthalene, 0.129 mg/L 1,2,4-trimethylbenzene, and 0.00907 mg/L chloroform. Groundwater flow direction was to the west by southwest. Depth to groundwater was 12.80 to 16.01 feet below ground surface. Sample was collected with a bladder pump after purging with the sampling interval near the soil/water interface.	Rebekah Reams
1/15/2021	Document, Report, or Work plan Review - other	November 12, 2020 groundwater sampling. Monitoring wells MW-2, MW-7, and MW-9 were sampled and analyzed for the full suite of VOCs. Monitoring well MW-3 and MW-6 were unable to be located due to snow. The following analytes were detected above groundwater cleanup levels: up to 0.0211 mg/L ethylbenzene, 0.0178 mg/L naphthalene, 0.0838 mg/L 1,2,4-trimethylbenzene, and 0.0157 mg/L chloroform. Groundwater flow direction was to the west by southwest. Depth to groundwater was 12.16 to 15.50 feet below ground surface.	Rebekah Reams
1/15/2021	Meeting or Teleconference Held	DEC staff met with Chevron Environmental Management Company (CEMC) and Arcadis to discuss Chevron sites located in Alaska during the Annual Portfolio Meeting on January 14th and 15th, 2021.	Rebekah Reams
6/18/2021	Document, Report, or Work plan Review - other	April 13, 2021 groundwater sampling. Monitoring wells MW-2, MW-6, MW-7 and MW-9 were sampled and analyzed for the full suite of VOCs. Monitoring well MW-3 and MW-4 were unable to be located due to ice and snow. The following analytes were detected above groundwater cleanup levels: up to 0.0307 mg/L ethylbenzene, 0.0281 mg/L naphthalene, 0.121 mg/L 1,2,4-trimethylbenzene, and 0.00881 mg/L chloroform. Groundwater flow direction was to the west by southwest. Depth to groundwater was 12.60 to 15.92 feet below ground surface.	Rebekah Reams
12/15/2021	Document, Report, or Work plan Review - other	August 31, 2021 groundwater sampling. Monitoring wells MW-2, MW-3, MW-6, MW-7 and MW-9 were sampled and analyzed for the full suite of VOCs. The following analytes were detected above groundwater cleanup levels: up to 0.0351 mg/L ethylbenzene, 0.022 mg/L naphthalene, 0.0896 mg/L 1,2,4-trimethylbenzene, 0.00431 mg/L TCE, 0.000853 mg/L vinyl chloride and 0.0128 mg/L chloroform. Groundwater flow direction was to the west by southwest. Depth to groundwater was 11.75 to 15.25 feet below ground surface.	Rebekah Reams
9/1/2022	Document, Report, or Work plan Review - other	DEC approved the Soil Investigation Work Plan following comment resolution. This work plan proposes to advance five soil borings in the vicinity of former sample locations D-2, D-8, T-5, SB10-6, and MW-2 to determine whether petroleum contamiation has attenuated and to evaluate the surface soil pathway at the site.	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
11/9/2022	Document, Report, or Work plan Review - other	April 11, 2022 groundwater sampling. Monitoring wells MW-2, MW-3, MW-6, and MW-9 were sampled and analyzed for the full suite of VOCs. Monitoring well MW-7 was frozen and could not be sampled, and MW-1 was frozen and could not be gauged. The following analytes were detected above groundwater cleanup levels: up to 0.00648 mg/L benzene, 0.0412 mg/L ethylbenzene, 0.025 mg/L naphthalene, 0.2 mg/L 1,2,4-trimethylbenzene, 0.0518 mg/L PCE, 0.00388 mg/L TCE, 0.00107 mg/L vinyl chloride, and 0.0132 mg/L chloroform. Groundwater flow direction was to the west by southwest. Depth to groundwater was 12.32 to 15.31 feet below ground surface.	Rebekah Reams
11/9/2022	Document, Report, or Work plan Review - other	ADEC approved a request to update the groundwater monitoring schedule to include analysis for BTEX, naphthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, PCE, TCE, cis-1,2-DCE, vinyl chloride, and chloroform at MW-1 through MW-4, MW-6, MW-7, and MW-9. Groundwater monitoring data indicates that GRO and DRO concentrations have been below cleanup levels in all site wells since 2016 and 2013, respectively. PAHs were sampled in 2017 and all analytes were reported below cleanup levels or non-detect.	Rebekah Reams
11/21/2022	Document, Report, or Work plan Review - other	DEC provided correspondence in response to the Revised Conceptual Site Model Summary Report. No additional revisions of the report are required; however, DEC requests that indoor air sampling be completed at this site due to elevated concentrations of chlorinated solvents detected in soil gas sampled collected in 2014, 2015, and 2020.	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
5/16/2023	Offsite Soil or Groundwater Disposal Approved	ADEC approved transport of 55 gallons of contaminated soil generated during the September 2022 site characterization event.	Rebekah Reams
11/21/2023	Offsite Soil or Groundwater Disposal Approved	ADEC approved offsite transport and disposal of 10 gallons of soil cuttings generated during the October 2022 site characterization work.	Rebekah Reams
11/30/2023	Site Visit	ADEC staff visited the site to observe current site use, layout, and monitoring well locations.	Rebekah Reams

Action Date

Action

Description

DEC Staff

5/25/1998

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 78013 Stockpile analytical results sent to ADEC via e-mail revealed gasoline and HVOCs in soils.

Former Staff

5/25/1998

Site Added to Database

Former Staff

8/11/1998

Underground Storage Tank Site Characterization or Assessment

Secor submits UST Removal/Site Assessment Report dated 8/6/98. Groundwater not encountered. Nine areas after excavation exceed soil cleanup levels (up to 417 mg/kg benzene and 12,000 mg/kg GRO).

Former Staff

8/11/1998

Document, Report, or Work plan Review - other

Secor submits release investigation workplan. Workplan includes the installation of 4 groundwater monitoring wells to assess the vertical and lateral extent of impacted soil and groundwater at the site.

Former Staff

8/11/1998

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

Former Staff

8/11/1998

Leaking Underground Storage Tank Corrective Action Underway

1,575 tons of excavated soil exceeding cleanup levels is transported to Alaska Soil Recycling for thermal treatment.

Robert Weimer

6/15/1999

Site Characterization Workplan Approved

ADEC approves 8/06/98 Release Investigation work plan with some minor revisions. HVOC and PAH testing has been added.

Former Staff

7/1/1999

Underground Storage Tank Site Characterization or Assessment

On 7/1/99 four monitoring wells were installed and soil and groundwater samples were collected. Soil contamination above cleanup levels was encountered at the soil water interface (17 feet below ground surface) in monitoring wells MW-2 and MW-3 (up to 3 mg/kg benzene and 929 mg/kg GRO). Up to 7.14 mg/l GRO, 64 ug/l benzene, and non-detect (<100 ug/l) MTBE in the groundwater.

Robert Weimer

1/30/2001

Meeting or Teleconference Held

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

Linda Nuechterlein

4/18/2001

Site Characterization Workplan Approved

Letter sent to Chevron approving installation of two monitoring wells at this site.

Linda Nuechterlein

9/5/2001

Underground Storage Tank Site Characterization or Assessment

On 9/5/01 two additional monitoring wells (MW5 and MW6) were across the street to the south and west of the site. One soil sample was collected from each soil boring at 10 feet below ground surface (bgs) and they were non-detect, but higher contamination levels may exist since a soil sample was not collected at the soil/water interface (14 feet bgs) and in MW5 the highest field reading depth was not sampled (14 feet bgs).

Robert Weimer

8/21/2002

Update or Other Action

RECKEY has automatically been generated.

Cynthia Pring-Ham

9/16/2003

Update or Other Action

Approved reduction in groundwater monitoring.

Robert Weimer

8/5/2004

Document, Report, or Work plan Review - other

June 2, 2004 groundwater sampling. Up to 14 mg/l GRO and 18 ug/l benzene. Contamination concentrations appear to be stable.

Robert Weimer

12/7/2004

Document, Report, or Work plan Review - other

September 22, 2004 groundwater sampling. Up to 10 mg/l GRO and 73 ug/l benzene. Contamination concentrations appear to be stable.

Robert Weimer

7/19/2005

Document, Report, or Work plan Review - other

May 11, 2005 groundwater sampling. Up to 7 mg/l GRO and 4 ug/l benzene. Contamination concentrations appear to be decreasing. Groundwater flows to the southwest.

Robert Weimer

11/28/2005

Document, Report, or Work plan Review - other

September 22, 2005 groundwater sampling. Up to 6 mg/l GRO and 30 ug/l benzene in the groundwater. Contamination concentrations appear to be increasing. Groundwater flows to the southwest. Depth to groundwater is 12 to 14 feet below ground surface.

Robert Weimer

1/10/2006

Meeting or Teleconference Held

Meeting with RP's consultant to discuss future site work. Needed additional monitoring well to southwest. Possible vac pump of groundwater. Need drinking water well search.

Robert Weimer

5/11/2006

Meeting or Teleconference Held

Meeting with RP and their consultant to discuss future site work. They are looking at access to install monitoring well to the southwest. They are currently conducting the sensitive receptor study.

Robert Weimer

6/27/2006

Site Characterization Workplan Approved

ADEC approves work plan to install one more monitoring well to the south west of the Chevron property.

Robert Weimer

7/20/2006

Document, Report, or Work plan Review - other

May 9, 2006 groundwater sampling event. Up to 0.84 mg/l GRO and 4.7 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flows to the southwest. Depth to groundwater is 14.1 to 16.2 feet below ground surface. EDB and 1,2-DCA were both non-detect (< 0.5 ug/l).

Robert Weimer

9/8/2006

Offsite Soil or Groundwater Disposal Approved

ADEC approves the thermal treatment of two drums of contaminated soil.

Robert Weimer

11/1/2006

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

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

5/15/2007

Document, Report, or Work plan Review - other

September 20, 2006 groundwater sampling event. Up to 1.3 mg/l GRO and 13 ug/l benzene in the groundwater. Contamination concentrations appear to be increasing. Groundwater flows to the southwest. Depth to groundwater is 12.3 to 15.7 feet below ground surface.

Robert Weimer

11/5/2007

Document, Report, or Work plan Review - other

Reviewed sensitive receptor and well survey report. Ten past domestic water well were identified within 1/4 mile of the site. They all appear to be upgradient or cross gradient from the site. All parcels in the area are commercial slab on grade without basements.

Robert Weimer

11/21/2007

Release Investigation

On July 12, 2006 an additional monitoring well was installed to the southwest across the intersection to help define the extent of the soil and groundwater contamination for this site. All soil samples were non-detect, but the detection limit for benzene was 0.1 mg/kg (which is above the benzene default cleanup level of 0.02 mg/kg). Groundwater was encountered at 14.5 feet below ground surface.

Robert Weimer

1/9/2008

Document, Report, or Work plan Review - other

May 15, 2007 groundwater sampling event. Up to 0.2 mg/l GRO and 2 ug/l benzene in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flows to the southwest. Depth to groundwater is 12.81 to 15.32 feet below ground surface.

Robert Weimer

1/18/2008

Conceptual Site Model Submitted

Review preliminary conceptual site model.

Robert Weimer

2/8/2008

Document, Report, or Work plan Review - other

September 23, 2007 groundwater sampling event. Up to 0.2 mg/l GRO and 3 ug/l benzene, and non-detect (<3 ug/l) MTBE in the groundwater. Contamination concentrations appear to be decreasing. Groundwater flows to the west by northwest. Depth to groundwater is 12.66 to 16.04 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 will continue oxygen and ozone injection in the source area monitoring wells.

Robert Weimer

4/21/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of 60 gallons of contaminated purge water.

Robert Weimer

5/6/2008

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

8/4/2008

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

12/17/2008

Document, Report, or Work plan Review - other

May 5, 2008 groundwater sampling event. Up to 1.51 mg/l GRO and 8.84 ug/l benzene, and non-detect (<3 ug/l) MTBE in the groundwater. Contamination concentrations increased in 1 of the 4 monitoring wells sampled. Groundwater flows to the west by southwest. Depth to groundwater is 12.74 to 16.22 feet below ground surface. Monitoring well MW-5 appears to have been paved over.

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 is to continue to sample monitoring well MW6 and MW7. Need confirmation soil samples prior to evaluating site for cleanup complete. Up to 12,000 mg/kg GRO and 3 mg/kg benzene left in 1998 and 1999 (MW), many of the locations are not near the existing UST system.

Robert Weimer

2/27/2009

Document, Report, or Work plan Review - other

July 16, 2008 groundwater sampling event. Up to 0.20 mg/l DRO, 0.80 mg/l GRO and 6.0 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 12.64 to 16.17 feet below ground surface. Monitoring well MW-5 appears to have been paved over.

Robert Weimer

6/16/2009

Site Visit

Site visit to observe groundwater sampling.

Robert Weimer

10/27/2009

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of 1 drum of contaminated purge water.

Robert Weimer

11/6/2009

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of 1 drum of contaminated purge water.

Robert Weimer

11/24/2009

Document, Report, or Work plan Review - other

June 16, 2009 groundwater sampling event. Up to 0.091 mg/l DRO, 0.25 mg/l GRO and 2.9 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater flows to the northwest. Depth to groundwater is 12.85 to 16.40 feet below ground surface. Monitoring well MW-5 appears to have been paved over.

Robert Weimer

1/4/2010

Document, Report, or Work plan Review - other

August 27, 2009 groundwater sampling event. Up to 0.25 mg/l DRO, 0.43 mg/l GRO and 3.4 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 4 monitoring wells sampled. Groundwater flows to the southwest. Depth to groundwater is 12.81 to 16.35 feet below ground surface. Monitoring well MW-5 appears to have been paved over.

Robert Weimer

3/11/2010

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 3/10/10. MW3 is to be sampled for PAH the next monitoring event. Chevron will submit a workplan for confirmation soil samples. 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

7/14/2010

Site Visit

Site visit to observe soil borings and soil sample collection by CRA consulting. Samplers include Andy Ellsmore, Tim Bunn, and Siobahn Fackelman.

Brenton Porter

7/30/2010

Update or Other Action

DEC receives notification that for the 7/14/10 soil confirmation sampling the bar-codes on the sample jars got damaged and the lab could not retrieve the weight of the jar. An average weight of the batch of jars was used to calculate the results. They propose to redo the sampling work on September 5th. DEC contacted the consultant and said that resampling would not be needed if they provide documentation of the range of weight of jars. DEC will review whether the range in weight was significant enough to elevate the sample results over site cleanup levels. This would result in the savings of thousands of dollars of resampling costs.

Robert Weimer

8/4/2010

Update or Other Action

DEC receives documentation of the range of weight of jars from the 7/14/10 confirmation soil sampling. The range in weight was not significant enough to elevate the sample results over site cleanup levels. Resampling is not required.

Robert Weimer

8/23/2010

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

10/25/2010

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of 1 drum of contaminated decontamination water.

Robert Weimer

11/16/2010

Document, Report, or Work plan Review - other

May 6, 2010 groundwater sampling event. Up to 0.03 mg/l GRO and non-detect DRO and benzene in the groundwater samples collected. Contamination concentrations decreased in 4 of the 4 monitoring wells sampled. Groundwater flows to the southwest. Depth to groundwater is 14.25 to 16.57 feet below ground surface. Monitoring well MW-5 appears to have been paved over. Monitoring well MW-2 was sampled for PAH's and those were all non-detect.

Robert Weimer

11/17/2010

Offsite Soil or Groundwater Disposal Approved

Approved transport and disposal of 1 drum and 3 super sacks of contaminated soil at the Columbia Ridge Landfill in Arlington, Oregon. The soil was generated during the July/August 2010 subsurface investigation.

Robert Weimer

3/14/2011

Document, Report, or Work plan Review - other

August 5, 2010 groundwater sampling event. Up to 1.1 mg/l DRO, 0.024 mg/l GRO, non-detect EDB, and 2.7 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 3 monitoring wells sampled. Groundwater flows to the southwest. Depth to groundwater is 13.98 to 15.38 feet below ground surface.

Robert Weimer

4/8/2011

Update or Other Action

ADEC reviewed request for reduction in groundwater monitoring at this site to annual. Based on the elevated soil contamination concentrations (up to 1,300 mg/kg GRO and 1.6 mg/kg benzene) identified as remaining at the site from the 2010 Subsurface Investigation, ADEC requested continued semi-annual ground water monitoring at the site.

Robert Weimer

5/19/2011

Site Visit

Site visit to observe the collection of groundwater samples. Hydrasleeves were used to collect VOC samples and bailers used to collect non VOC samples.

Robert Weimer

10/26/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of 1 drum of contaminated decontamination water.

Robert Weimer

2/6/2012

Document, Report, or Work plan Review - other

Between July 14, 2010 and August 5, 2010 eight soil borings were sampled to check current contamination concentrations in the soil at the site. Up to 1,300 mg/kg GRO (300 mg/kg cleanup level), 0.063 mg/kg tetrachloroethane (PCE) (0.024 mg/kg cleanup level), and 1.6 mg/kg benzene (0.025 mg/kg cleanup level) was identified as remaining at the site. Four of the eleven locations sampled exceeded cleanup levels for benzene, and two locations exceeded cleanup levels for GRO. The highest concentrations were in the soil/water interface at 16 feet below ground surface (bgs) on the south side of the property just east of monitoring well MW-3. The PCE contamination is located at 8 feet bgs near the former used oil tank.

Robert Weimer

3/1/2012

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 to submit a workplan for conducting a release investigation for the PCE soil contamination at SB1 that is to inlude the installation of a monitoring well in that area. After a review of the results of the release investigation they may need to collect soil gas samples. They are to continue semi-annual groundwater monitoring.

Robert Weimer

7/13/2012

Document, Report, or Work plan Review - other

The Well Installation Workplan is approved under the following conditions: 1. The soil and groundwater samples be analyzed for the full list of VOC’s (8260B), not just PCE. 2. An additional soil sample be collected at the highest field screening depth between 9 feet below ground surface (bgs) and the soil water interface. 3. That the vacuum truck be used to clear the borehole no greater than 6 feet bgs. 4. The soil sample collected at 8 to 9 feet bgs not be collected from auger cuttings. A spilt spoon or coring device needs to be used to collect an undisturbed sample. 5. The VOC and GRO groundwater samples be collected using a low flow submersible pump, bladder pump, or hydrasleeve.

Robert Weimer

8/17/2012

Offsite Soil or Groundwater Disposal Approved

ADEC approves offsite treatment of contaminated purge water.

Robert Weimer

12/20/2012

Document, Report, or Work plan Review - other

May 23, 2012 groundwater sampling event. Up to 0.5 mg/l DRO, 1.8 mg/l GRO, and 7.5 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 3 monitoring wells sampled. Groundwater flows to the southwest. Depth to groundwater is 13.49 to 16.11 feet below ground surface. Results are biased low because samples were not preserved in the field.

Robert Weimer

2/14/2013

Document, Report, or Work plan Review - other

July 31, 2012 groundwater sampling event. Up to 0.89 mg/l DRO, 2.9 mg/l GRO, non-detect (<0.5 ug/l) 1,2-DCA, 1.0 ug/l PCE, and 6.8 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 5 monitoring wells sampled. Monitoring well MW-2 has the highest GRO concentrations since 2005. Groundwater flows to the southwest. Depth to groundwater is 13.42 to 16.03 feet below ground surface.

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 next monitoring event they will sample all of the site monitoring wells (MW1-7 and 9) for HVOCs (method 8260). 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. Based on the HVOC sample results Chevron may need to do a vapor intrusion assessment.

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

5/21/2013

Update or Other Action

Consultant called to notify ADEC that the recent ground water samples were over temperature and outside holding times. They will have the samples analyzed and note in the report that those samples mat be biased low. ADEC will review the results of the split samples to determine if another split sample event will be needed.

Robert Weimer

6/27/2013

Site Visit

Site visit to observe current site conditions.

Robert Weimer

1/2/2014

Document, Report, or Work plan Review - other

On July 23, 2013 monitoring well MW-9 was installed and sampled. MW-9 is located just to the west of soil boring SB-1 that had 0.063 mg/kg PCE at 8 feet bgs when it was sampled on August 5, 2010. Soil samples were collected and analyzed at 9, 12, and 17 feet bgs. Groundwater was encountered at 17 feet bgs. Up to 0.24 mg/kg PCE, non-detect (<0.6 mg/kg) GRO, and non-detect (<0.033 mg/kg) benzene in the soil samples collected. The highest concentration was at 9 feet bgs. The soil sample collected at the soil/water interface had 0.06 mg/kg PCE. The consultant recommends that all site monitoring wells be sampled for PCE. Because of the remaining PCE soil contamiantion next to the station building, soil gas, sub-slab, or indoor air sampling is needed to evaluate the indoor air pathway.

Robert Weimer

1/21/2014

Document, Report, or Work plan Review - other

May 23, 2013 groundwater sampling event. Up to 1.5 mg/l DRO, 1.7 mg/l GRO, 46 ug/l PCE, and 8.5 ug/l benzene in the groundwater. Samples may be biased low because samples were over temperature and analyzed outside of holding times. Contamination levels increased in 5 of the 7 monitoring wells sampled. Groundwater flows to the north. Depth to groundwater is 12.12 to 15.72 feet below ground surface. Groundwater samples were collected 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. Monitoring well MW3 had 4.4 ug/l benzene with purge, but 8.5 ug/l benzene with no-purge. Monitoring well MW2 had 0.75 mg/l DRO, 1.7 mg/l GRO, and 46 ug/l PCE with purge, but 1.5 mg/l DRO, 0.43 mg/l GRO, and 18 ug/l PCE with no-purge.

Robert Weimer

2/13/2014

Document, Report, or Work plan Review - other

September 17-18, 2013 groundwater sampling event. Up to 1.8 mg/l DRO, 0.68 mg/l GRO, 24 ug/l PCE, and 1.3 ug/l benzene in the groundwater. Contamination concentrations increased in 7 of the 7 monitoring wells sampled. Groundwater flows to the northeast. Depth to groundwater is 11.57 to 15.75 feet below ground surface. Groundwater samples were collected by no-purge with hydrasleeves at the top of the water column.

Robert Weimer

2/20/2014

Update or Other Action

Vapor Intrusion Evaluation Report - PCE in soil and groundwater above cleanup levels within 30 feet of the station building. Consultant recommends VI investigation in 2014, with a work plan to be submitted in the spring of 2014.

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 including HVOC's. They will submit a work plan for the installation of soil vapor probes and soil gas sampling. 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. 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

4/29/2014

Document, Report, or Work plan Review - other

DEC provided review comments on proposed soil vapor probe installation work plan 1. Need three soil gas sample locations per building. 2. Why 9 feet depth to top of well screen? Depths and locations should be based on building survey. If slab on grade building the top of the screen should be 5 feet below ground surface. 3. Need to discuss how you will measure helium to ensure leak test passes. Need to measure helium under the shroud or container as well as at end of sample train during purging. 4. Need to provide more detail regarding collection of duplicate sample. Ideally a duplicate and primary summa will both be attached in-line to sample train and thus, soil gas samples will be collected simultaneously. 5. If vac truck or air knife is used within 5 feet vertically or horizontally of a soil probe screen interval then need to wait at least 1 week before collecting soil gas sampling instead of the 48 hours proposed in the work plan. 6. No soil analytical samples are requested as part of the soil gas probe installation. 7. Need a completed building survey form with the report, but need item #5 information on the form for the work plan.

Robert Weimer

5/1/2014

Document, Report, or Work plan Review - other

DEC reviewed revised soil vapor assessment work plan. The Chevron building is slab on grade, three soil gas probes are to be installed with a screened interval starting at 5 feet below ground surface. The revised work plan is approved under the condition that helium is also measured at the end of the sample train during purging. Probes are to be installed on 5/2/2014 and to be sampled one or two weeks later.

Robert Weimer

5/5/2014

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

7/21/2014

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of drill cuttings and decon water from site work done on 7/23/12.

Robert Weimer

7/28/2014

Document, Report, or Work plan Review - other

ADEC approves temporary storage of 3 drum of drill cuttings at the secure area at 1441 C Street. The cuttings were generated during the soil vapor probe installation in May 2014.

Robert Weimer

9/5/2014

Document, Report, or Work plan Review - other

Phase I assessment identified that a drying cleaning businesses operating on this property in the 1960's, including Snow White Cleaners in a 1969 listing. The service station underground storage tanks were installed in 1970.

Robert Weimer

9/8/2014

Update or Other Action

Updated the address for this site from 1456 West Northern Lights Blvd. to 1465 West Northern Lights Blvd.

Robert Weimer

11/13/2014

Conceptual Site Model Submitted

Conceptual site model identified soil/groundwater soil ingestion and inhalation of indoor/outdoor air pathways.

Robert Weimer

2/10/2015

Document, Report, or Work plan Review - other

May 1, 2014 groundwater sampling event. Up to 0.54 mg/l DRO, 1.6 mg/l GRO, 32 ug/l PCE, and 4.8 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 7 monitoring wells sampled. Groundwater flows to the north this monitoring event. Depth to groundwater was 12.40 to 15.82 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. Because the bladder pump intake was not within the top foot of the water column (it was 1.98 to 2.04 feet below the water surface) the results are considered biased low.

Robert Weimer

4/27/2015

Document, Report, or Work plan Review - other

September 23, 2014 groundwater sampling event. Up to 0.48 mg/l DRO, 1.2 mg/l GRO, 51 ug/l PCE, and 5.2 ug/l benzene in the groundwater. Contamination concentrations increased in 7 of the 7 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 11.76 to 15.44 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. Because the bladder pump intake was not within the top foot of the water column (it was 1.97 to 2.01 feet below the water surface) or it was not documented (MW-2) the results are considered biased low.

Robert Weimer

4/27/2015

Document, Report, or Work plan Review - other

ADEC concurs with April 2015 Groundwater Monitoring and Sampling Work Plan recommendation to reduce groundwater monitoring to semi-annual for the 7 site monitoring wells for HVOCs and (GRO/DRO/BTEX) in monitoring wells MW-2, MW-3, MW-6, MW-7, and MW-9.

Robert Weimer

9/18/2015

Document, Report, or Work plan Review - other

On May 2, 2014 three soil gas probes were installed with a screened interval starting at 5 feet below ground surface. On July 28, 2014 the three soil gas probes were sampled after purging 3 to 5 volumes of air. Up to 10 mg/m3 PCE in the samples collected which exceeds the residential screening level of 0.41 mg/m3 and commercial screening level of 1.8 mg/m3. They plan to conduct another sampling event in early 2015 during frozen ground conditions.

Robert Weimer

9/22/2015

Document, Report, or Work plan Review - other

On February 2, 2015 the three soil gas probes were sampled after purging 3 to 5 volumes of air. Up to 2.1 mg/m3 PCE in the samples collected which exceeds the residential screening level of 0.41 mg/m3 and commercial screening level of 1.8 mg/m3. The results were flagged as estimated by the laboratory. This result was lower than the 10 mg/m3 detect during the July 2014 sampling event.

Robert Weimer

2/3/2016

Offsite Soil or Groundwater Disposal Approved

DEC approves of request to dispose of 3 drums of contaminated drill cuttings at WMI's Arlington Landfill. The drill cuttings were generated during the June 12, 2015 soil vapor probe installation work.

Robert Weimer

4/6/2016

Document, Report, or Work plan Review - other

May 3, 2015 groundwater sampling event. Up to 1.2 mg/l DRO, 2.8 mg/l GRO, 11 ug/l PCE, 0.8 ug/l 1,2-DCA, and 7.0 ug/l benzene in the groundwater. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 12.73 to 16.22 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required.

Robert Weimer

6/2/2016

Document, Report, or Work plan Review - other

November 4, 2015 groundwater sampling event. Up to 0.57 mg/l DRO, 1.4 mg/l GRO, 40 ug/l PCE, non-detect ug/l 1,2-DCA, and 5.0 ug/l benzene in the groundwater. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 13.16 to 15.78 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required.

Robert Weimer

2/27/2017

Update or Other Action

DEC approves, until further notice, suspending sampling of monitoring wells MW-1 and MW-4. DEC requests that the next groundwater monitoring event include full PAHs (8270) and full VOCs (8260) along with normal HVOCs and (GRO/DRO/BTEX) sampling in monitoring wells MW-2, MW-3, MW-6, MW-7, and MW-9.

Robert Weimer

2/27/2017

Document, Report, or Work plan Review - other

April 20, 2016 groundwater sampling event. Up to 1.4 mg/l DRO, 2.7 mg/l GRO, 12 ug/l PCE, non-detect ug/l 1,2-DCA, and 8.0 ug/l benzene in the groundwater. Contamination concentrations increased in 1 of the 7 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 12.78 to 16.34 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required.

Robert Weimer

6/29/2017

Document, Report, or Work plan Review - other

October 27-28, 2016 groundwater sampling event. Up to 0.34 mg/l DRO, 0.64 mg/l GRO, 3 ug/l PCE, 0.9 ug/l 1,2-DCA, and 5.0 ug/l benzene in the groundwater. Contamination concentrations increased in 2 of the 7 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 12.80 to 16.35 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required.

Robert Weimer

1/23/2018

Document, Report, or Work plan Review - other

May 2, 2017 groundwater sampling event. Up to 0.61 mg/l DRO, 1.3 mg/l GRO, 15 ug/l PCE, 16 ug/l Chloroform (not in trip blank), and 2.0 ug/l benzene in the groundwater. Some PAHs were detected. The samples were non-detect for MTBE, 1,2-DCA, and EDB. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Groundwater flows to the southwest this monitoring event. Depth to groundwater was 13.10 to 16.67 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required. Missing Naphthalene results for the 8260 analysis.

Robert Weimer

2/9/2018

Document, Report, or Work plan Review - other

October 12, 2017 groundwater sampling event. Up to 0.094 mg/l DRO, 0.26 mg/l GRO, 12 ug/l PCE, 0.6 ug/l TCE, 1.0 ug/l 1,2-cis DCA, 15 ug/l Chloroform (not in trip blank), and 1.0 ug/l benzene in the groundwater. PAH analysis was not conducted. Contamination concentrations increased in 1 of the 5 monitoring wells sampled. Groundwater flows to the northeast this monitoring event. Depth to groundwater was 11.35 to 16.72 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required. Missing Naphthalene results for the 8260 analysis.

Robert Weimer

7/16/2018

Document, Report, or Work plan Review - other

April 18, 2018 groundwater sampling event. Up to 0.029 mg/l GRO, 12 ug/l PCE, 0.6 ug/l TCE, 6 ug/l Chloroform (not in trip blank) in the groundwater. PAH analysis was not conducted. DRO and other VOCs were non-detect. Contamination concentrations increased in 2 of the 5 monitoring wells sampled. Groundwater flows to the northeast this monitoring event. Depth to groundwater was 13.10 to 16.59 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required. Missing Naphthalene results for the 8260 analysis.

Robert Weimer

1/17/2019

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 78013 1999 UST contamination.

Robert Weimer

5/9/2019

Document, Report, or Work plan Review - other

September 5, 2018 groundwater sampling event. Up to 0.34 mg/l GRO, 2 ug/l benzene, 13 ug/l PCE, 0.3 ug/l TCE, 3 ug/l cis-1,2-Dichloroethene, 3 ug/l Ethylbenzene, 0.2 ug/l Toluene, 2.7 ug/l Xylenes, 9 ug/l Chloroform (not in trip blank) in the groundwater. PAH analysis was not conducted. DRO and other VOCs were non-detect. Contamination concentrations increased in 3 of the 5 monitoring wells sampled. Groundwater flows to the northeast this monitoring event. Depth to groundwater was 12.68 to 16.19 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were collected from the top foot of the water column as required. Missing Naphthalene results for the 8260 analysis.

Robert Weimer

5/15/2019

Update or Other Action

ADEC requested submittal of method 8260 naphthalene results that were not included for this and the previous 2018 groundwater sampling events. ADEC also requested for this and all GHD Chevron sites that laboratory 8260 VOC analysis include and report the naphthalene results and that they are included on monitoring event and historical data tables.

Robert Weimer

9/23/2019

Update or Other Action

Robert Weimer

9/23/2019

Document, Report, or Work plan Review - other

ADEC approves suspending all GRO and DRO groundwater analysis for this site. For monitoring wells MW-2, MW-3, MW-6, MW-7, and MW-9 ADEC is requesting VOC sampling to include the full 8260 VOC list including naphthalene.

Robert Weimer

11/5/2019

Meeting or Teleconference Held

Meeting with Chevron's consultant. They will provide an updated site figure showing estimated extent of soil contamination for each of the following: over maximum allowable, over human health, and over migration to groundwater. May need confirmation soil sampling to document current concentrations. They will provide a work plan for conducting additional vapor intrusion assessment during frozen and non-frozen ground conditions. DEC requested that site reports be submitted within 60 days of sampling, VOC analysis include naphthalene, and groundwater monitoring figure include diagram showing historic groundwater flow direction.

Robert Weimer

1/8/2020

Document, Report, or Work plan Review - other

April 22, 2019 groundwater sampling event. Up to 0.13 mg/l DRO, 0.093 mg/l GRO, 0.3 ug/l benzene, 14 ug/l PCE, 0.8 ug/l TCE, 0.6 ug/l cis-1,2-Dichloroethene, 3 ug/l Ethylbenzene, 2.0 ug/l Toluene, 1.0 ug/l Xylenes, 11 ug/l Chloroform (not in trip blank) in the groundwater. PAH analysis was not conducted. DRO and other VOCs were non-detect. Contamination concentrations increased in 5 of the 5 monitoring wells sampled. Groundwater flows to the south by southwest this monitoring event. Depth to groundwater was 12.68 to 16.88 feet below ground surface. Groundwater samples were collected after purging with a bladder pump. The samples were not collected from the top foot of the water column as required so the results may be biased low. Missing Naphthalene results for the 8260 analysis. They Naphthalene results have been requested.

Robert Weimer

2/19/2020

Document, Report, or Work plan Review - other

ADEC conditionally approves the January 21, 2020 Soil Vapor Investigation Work Plan for Chevron #91356, 1465 West Northern Lights Boulevard site. The condition is that the samples are analyzed for the full list of TO-15 compounds instead of just PCE as proposed. The work plan proposes to collect soil gas samples from the 3 existing soil vapor probes (SVP-1, SVP-2, and SVP-3) during frozen and non-frozen ground conditions in 2020.

Robert Weimer

3/12/2020

Update or Other Action

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

Robert Weimer

3/17/2020

Document, Report, or Work plan Review - other

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

Robert Weimer

1/11/2021

Document, Report, or Work plan Review - other

September 20, 2019 groundwater sampling. Monitoring wells MW-2, MW-3, MW-6, MW-7 and MW-9 were sampled and analyzed for GRO, DRO, BTEX, EDC, EDB, PCE, and chloroform. Monitoring well MW-8 was unable to be located and was not sampled. Toluene, EDB, and chloroform were detected in the equipment blank sample. Groundwater cleanup level exceedances during this monitoring event include chloroform up to 0.011 mg/L (not detected in trip blank) and vinyl chloride 0.27 ug/L (J flagged) at MW-7. Duplicate sample was collected from MW-9. Groundwater flow direction was to the west by southwest. Depth to groundwater was 11.84 to 15.92 feet below ground surface. Sample was collected with a bladder pump after purging with the sampling interval near the soil/water interface.

Rebekah Reams

1/11/2021

Document, Report, or Work plan Review - other

April 10, 2020 groundwater sampling. Monitoring wells MW-2 and MW-9 were sampled and analyzed for BTEX, MTBE, VOCs, EDC, EDB, PCE, chloroform, and naphthalene. Monitoring well MW-3 was unable to be located due to the presence of an ice berm so was not sampled and MW-6 and MW-7 were obstructed by ice and could not be sampled. The following analytes were detected above groundwater cleanup levels: up to 0.00601 mg/L naphthalene, 0.129 mg/L 1,2,4-trimethylbenzene, and 0.00907 mg/L chloroform. Groundwater flow direction was to the west by southwest. Depth to groundwater was 12.80 to 16.01 feet below ground surface. Sample was collected with a bladder pump after purging with the sampling interval near the soil/water interface.

Rebekah Reams

1/15/2021

Document, Report, or Work plan Review - other

November 12, 2020 groundwater sampling. Monitoring wells MW-2, MW-7, and MW-9 were sampled and analyzed for the full suite of VOCs. Monitoring well MW-3 and MW-6 were unable to be located due to snow. The following analytes were detected above groundwater cleanup levels: up to 0.0211 mg/L ethylbenzene, 0.0178 mg/L naphthalene, 0.0838 mg/L 1,2,4-trimethylbenzene, and 0.0157 mg/L chloroform. Groundwater flow direction was to the west by southwest. Depth to groundwater was 12.16 to 15.50 feet below ground surface.

Rebekah Reams

1/15/2021

Meeting or Teleconference Held

DEC staff met with Chevron Environmental Management Company (CEMC) and Arcadis to discuss Chevron sites located in Alaska during the Annual Portfolio Meeting on January 14th and 15th, 2021.

Rebekah Reams

6/18/2021

Document, Report, or Work plan Review - other

April 13, 2021 groundwater sampling. Monitoring wells MW-2, MW-6, MW-7 and MW-9 were sampled and analyzed for the full suite of VOCs. Monitoring well MW-3 and MW-4 were unable to be located due to ice and snow. The following analytes were detected above groundwater cleanup levels: up to 0.0307 mg/L ethylbenzene, 0.0281 mg/L naphthalene, 0.121 mg/L 1,2,4-trimethylbenzene, and 0.00881 mg/L chloroform. Groundwater flow direction was to the west by southwest. Depth to groundwater was 12.60 to 15.92 feet below ground surface.

Rebekah Reams

12/15/2021

Document, Report, or Work plan Review - other

August 31, 2021 groundwater sampling. Monitoring wells MW-2, MW-3, MW-6, MW-7 and MW-9 were sampled and analyzed for the full suite of VOCs. The following analytes were detected above groundwater cleanup levels: up to 0.0351 mg/L ethylbenzene, 0.022 mg/L naphthalene, 0.0896 mg/L 1,2,4-trimethylbenzene, 0.00431 mg/L TCE, 0.000853 mg/L vinyl chloride and 0.0128 mg/L chloroform. Groundwater flow direction was to the west by southwest. Depth to groundwater was 11.75 to 15.25 feet below ground surface.

Rebekah Reams

9/1/2022

Document, Report, or Work plan Review - other

DEC approved the Soil Investigation Work Plan following comment resolution. This work plan proposes to advance five soil borings in the vicinity of former sample locations D-2, D-8, T-5, SB10-6, and MW-2 to determine whether petroleum contamiation has attenuated and to evaluate the surface soil pathway at the site.

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

11/9/2022

Document, Report, or Work plan Review - other

April 11, 2022 groundwater sampling. Monitoring wells MW-2, MW-3, MW-6, and MW-9 were sampled and analyzed for the full suite of VOCs. Monitoring well MW-7 was frozen and could not be sampled, and MW-1 was frozen and could not be gauged. The following analytes were detected above groundwater cleanup levels: up to 0.00648 mg/L benzene, 0.0412 mg/L ethylbenzene, 0.025 mg/L naphthalene, 0.2 mg/L 1,2,4-trimethylbenzene, 0.0518 mg/L PCE, 0.00388 mg/L TCE, 0.00107 mg/L vinyl chloride, and 0.0132 mg/L chloroform. Groundwater flow direction was to the west by southwest. Depth to groundwater was 12.32 to 15.31 feet below ground surface.

Rebekah Reams

11/9/2022

Document, Report, or Work plan Review - other

ADEC approved a request to update the groundwater monitoring schedule to include analysis for BTEX, naphthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, PCE, TCE, cis-1,2-DCE, vinyl chloride, and chloroform at MW-1 through MW-4, MW-6, MW-7, and MW-9. Groundwater monitoring data indicates that GRO and DRO concentrations have been below cleanup levels in all site wells since 2016 and 2013, respectively. PAHs were sampled in 2017 and all analytes were reported below cleanup levels or non-detect.

Rebekah Reams

11/21/2022

Document, Report, or Work plan Review - other

DEC provided correspondence in response to the Revised Conceptual Site Model Summary Report. No additional revisions of the report are required; however, DEC requests that indoor air sampling be completed at this site due to elevated concentrations of chlorinated solvents detected in soil gas sampled collected in 2014, 2015, and 2020.

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

5/16/2023

Offsite Soil or Groundwater Disposal Approved

ADEC approved transport of 55 gallons of contaminated soil generated during the September 2022 site characterization event.

Rebekah Reams

11/21/2023

Offsite Soil or Groundwater Disposal Approved

ADEC approved offsite transport and disposal of 10 gallons of soil cuttings generated during the October 2022 site characterization work.

Rebekah Reams

11/30/2023

Site Visit

ADEC staff visited the site to observe current site use, layout, and monitoring well locations.

Rebekah Reams

Contaminant Information

Name

Level Description

Media

Comments

Control Type

Type

Details

Requirements

Description

Details

1999 Site Assessment Report

2014/2015 Winter Soil Vapor Sampling Report

2015 Soil Vapor Probe Installation and Sampling Report

2013 Initial Vapor Intrusion Evaluation Report

2013 Well Installation Report

2011 Subsurface Investigation Report

2010 Vapor Intrusion Evaluation Report

2007 Subsurface Investigation Report

2004 Site Assessment & Well Installation Report

2001 Installation of Groundwater Monitoring Wells

2017 First Semi-Annual Groundwater Monitoring Report

1998 UST Removal and Site Assessment Report

2014 Conceptual Site Model Report

2001 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 - #1356

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

1999 Site Assessment Report

2014/2015 Winter Soil Vapor Sampling Report

2015 Soil Vapor Probe Installation and Sampling Report

2013 Initial Vapor Intrusion Evaluation Report

2013 Well Installation Report

2011 Subsurface Investigation Report

2010 Vapor Intrusion Evaluation Report

2007 Subsurface Investigation Report

2004 Site Assessment & Well Installation Report

2001 Installation of Groundwater Monitoring Wells

2017 First Semi-Annual Groundwater Monitoring Report

1998 UST Removal and Site Assessment Report

2014 Conceptual Site Model Report

2001 First Semi-Annual Groundwater Monitoring Report

Missing Location Data

State of Alaska Department of Environmental Conservation