Site Report: Texaco - #91 Oehrlis

Site Name:	Texaco - #91 Oehrlis
Address:	919 East Dimond Boulevard, Anchorage, AK 99515
File Number:	2100.26.106
Hazard ID:	24054
Status:	Active
Staff:	Alena Voigt, 9072697556 alena.voigt@alaska.gov
Latitude:	61.145036
Longitude:	-149.864658
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

Gasoline, diesel, and used oil contaminated soils encountered during UST removal and station upgrade in 1990. 1,077 tons of contaminated soils were excavated and thermally treated. Halogenated organics contamination was found at the used oil UST. Groundwater monitoring wells were installed in 1990 and benzene and gasoline range organics contamination were found in the groundwater. Groundwater is at about 10 feet below ground surface and flows to the northwest and southwest. In 1992 a soil vapor extraction system was installed, expanded in 1994 to include an air sparge well, and operated until 1997. In 2008 five soil borings were sampled as part of a Phase II Assessment. The soil borings had up to 1.8 mg/kg benzene, 60.8 mg/kg GRO, 64.5 mg/kg DRO, 82.5 mg/kg RRO and up to 7.22 mg/kg lead in the areas sampled. In 2013 seven soil borings were sampled, and three of them were converted into monitoring wells (MW-6, MW-7, and MW-8). Up to 0.189 mg/kg benzene (MW-6 at 10 feet bgs), 0.0673 mg/kg EDB (MW-7 at 13 feet bgs - 0.00016 mg/kg cleanup level), and 0.0451 mg/kg EDC (MW-7 at 13 feet bgs - 0.016 mg/kg cleanup level). In 2018 four additional monitoring wells (MW-9, MW-10, MW-12, and MW-13) were installed. These monitoring wells were installed off-property just to the west of the gas station property. Soil and ground water contamination remains and extends off property to the southwest and west. Texaco continues to monitor the groundwater at this active gas station.

Action Information

Action Date	Action	Description	DEC Staff
7/6/1990	Underground Storage Tank Site Characterization or Assessment	ENSR Consultants submit a workplan to ADEC for UST removal and site characterization. Approved by ADEC with stipulations. Station being upgraded.	Former Staff
7/9/1990	Leaking Underground Storage Tank Corrective Action Underway	Gasoline and diesel contaminated soils approved by ADEC for thermal treatment at AS&G. AS&G processed 1,077 tons on 7/28/90.	Former Staff
7/10/1990	Site Added to Database		Former Staff
7/10/1990	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 77716 Used oil, chlorinated solvents, gasoline and diesel contaminants.	Former Staff
7/11/1990	Leaking Underground Storage Tank Cleanup Initiated - Petroleum	LCAU Date changed DB conversion	Former Staff
9/11/1990	Update or Other Action	ENSR sends lab data that shows 100 ppb tetrachloroethylene in soils. Propose to process used oil contaminated soil through AK Pollution Control. APC will thermally treat soils to a level so they can be disposed of at the Anchorage Regional Landfill.	Former Staff
9/21/1990	Update or Other Action	Permission to transport used oil contaminated soils to AK Pollution Control in Palmer for thermal treatment granted after lab results were received.	Former Staff
10/2/1990	Document, Report, or Work plan Review - other	ENSR consulting environmental assessment report states that contaminated soils above 100 mg/kg were removed during tank/piping excavation. Groundwater is about 10 feet below the surface and flows towards the northwest and southwest. Benzene ranging from 2.8 ug/l to 16.0 ug/l was found in the four on-site monitoring wells in August 1990.	Former Staff
3/22/1991	Update or Other Action	ENSR submits a plan which proposes a vapor extraction system for the former pump island & gasoline tank areas. For the used oil tank area it's recommended that in situ biological treatment for the contaminated soils in that area.	Former Staff
11/20/1997	Update or Other Action	ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TEXACO REFINING & MARKETING INC.	Former Staff
7/26/2000	Update or Other Action	ADEC letter requesting corrective action plan for the remaining soil and groundwater contamination, and a work plan for additional monitoring well installation to help define the extent of contamination.	Robert Weimer
6/7/2004	Document, Report, or Work plan Review - other	Reviewed quarterly groundwater monitoring report. Up to 62 ug/l benzene and 6,000 ug/l GRO in the groundwater. Contaminant concentrations are increasing in some monitoring wells and the extent of the contamination has not been defined.	Robert Weimer
9/29/2004	Document, Report, or Work plan Review - other	Reviewed quarterly groundwater monitoring report. Up to 64 ug/l benzene and 110 ug/l GRO in the groundwater. Contaminant concentrations are increasing in one monitoring well and the extent of the contamination has not been defined.	Robert Weimer
11/18/2004	Document, Report, or Work plan Review - other	Reviewed quarterly groundwater monitoring report. Up to 65 ug/l benzene and 110 ug/l GRO in the groundwater. Contaminant concentrations are increasing in one monitoring well and the extent of the contamination has not been defined.	Robert Weimer
1/21/2005	Document, Report, or Work plan Review - other	Reviewed the December 1, 2004 groundwater monitoring event report. Up to 52 ug/l benzene and 170 ug/l GRO in the groundwater. Contaminant concentrations are increasing in one monitoring well and the extent of the contamination has not been defined.	Robert Weimer
5/13/2005	Document, Report, or Work plan Review - other	Reviewed the March 8, 2005 groundwater monitoring event report. Up to 120 ug/l benzene and 530 ug/l GRO in the groundwater. Contaminant concentrations are increasing and the extent of the contamination to the west and southwest has not been defined.	Robert Weimer
9/16/2005	Document, Report, or Work plan Review - other	Reviewed the June 8, 2005 groundwater monitoring event report. Up to 170 ug/l benzene and 1,000 ug/l GRO in the groundwater. Contaminant concentrationsare increasing and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest this monitoring event.	Robert Weimer
12/8/2005	Document, Report, or Work plan Review - other	Reviewed the 9/24/05 groundwater monitoring event report. Up to 170 ug/l benzene and 1,000 ug/l GRO in the groundwater. Contaminant concentrations are stable and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the southwest this monitoring event. Depth to groundwater was 5 to 7 feet below ground surface.	Robert Weimer
1/19/2006	Update or Other Action	ADEC issues approval of release investigation workplan for the installation of two additional monitoring wells located just to the west of the Service Station.	Robert Weimer
1/24/2006	Document, Report, or Work plan Review - other	Reviewed the 12/03/05 groundwater monitoring event report. Up to 73.3 ug/l benzene and 454 ug/l GRO in the groundwater. Contaminant concentrations appear stable and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the southwest this monitoring event. Depth to groundwater was 5 to 7 feet below ground surface.	Robert Weimer
5/12/2006	Document, Report, or Work plan Review - other	Reviewed the 3/21/06 groundwater monitoring event report. Up to 73.3 ug/l benzene and 830 ug/l GRO in the groundwater. Contaminant concentrations appear stable and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the southwest this monitoring event. Depth to groundwater was 6 to 9 feet below ground surface.	Robert Weimer
11/21/2006	Document, Report, or Work plan Review - other	Reviewed the 9/25/06 groundwater monitoring event report. Up to 43.1 ug/l benzene and 168 ug/l GRO in the groundwater. Contaminant concentrations appear stable and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the south by southwest this monitoring event. Depth to groundwater was 7 to 8 feet below ground surface.	Robert Weimer
3/8/2007	Exposure Tracking Model Ranking	Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site.	Robert Weimer
4/10/2007	Document, Report, or Work plan Review - other	Reviewed the 12/12/06 groundwater monitoring event report. Up to 17 ug/l benzene and 4,510 ug/l GRO in the groundwater. Contaminant concentrations appear to be increasing and the extent of the contamination to the west and southwest has not been defined. Groundwater flow is generally to the south by southwest. Depth to groundwater was 6.2 to 7.7 feet below ground surface.	Robert Weimer
5/4/2007	Update or Other Action	ADEC approves request for no-purge groundwater sampling for this site.	Robert Weimer
12/17/2007	Document, Report, or Work plan Review - other	Reviewed the 3/29/07 groundwater monitoring event report. Up to 26 ug/l benzene and 4,510 ug/l GRO (from the 12/12/06 monitoring event) in the groundwater. Contaminant concentrations appear to be increasing and the extent of the contamination to the west and southwest has not been defined. Groundwater flow is generally to the south by southwest. Depth to groundwater was 6.4 to 8.7 feet below ground surface.	Robert Weimer
2/4/2008	Document, Report, or Work plan Review - other	Reviewed the 6/21/07 groundwater monitoring event report. Up to 40.1 ug/l benzene and 4,510 ug/l GRO (from 12/12/06 monitoring event) in the groundwater. Contaminant concentrations appear to be increasing and the extent of the contamination to the west and southwest has not been defined. Groundwater flow is generally to the south by southwest. Depth to groundwater was 6.1 to 6.34 feet below ground surface.	Robert Weimer
2/5/2008	Document, Report, or Work plan Review - other	Reviewed the 9/26/07 groundwater monitoring event report. Up to 86.9 ug/l benzene and 194 ug/l GRO in the groundwater. Contaminant concentrations appear to be increasing and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.78 to 7.99 feet below ground surface.	Robert Weimer
4/28/2008	Document, Report, or Work plan Review - other	Reviewed the 12/13/07 groundwater monitoring event report. Up to 45.2 ug/l benzene and 290 ug/l GRO in the groundwater. Contaminant concentrations increased in one of the three monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest during this monitoring event. Depth to groundwater was 6.51 to 7.85 feet below ground surface.	Robert Weimer
4/28/2008	Document, Report, or Work plan Review - other	A property transfer Phase II environmental assessment was conducted on January 25-29, 2008. Five soil borings were drilled and one groundwater sample was collected. The soil borings had 1.8 mg/kg benzene, 60.8 mg/kg GRO, 64.5 mg/kg DRO, 82.5 mg/kg RRO and up to 7.22 mg/kg lead in the areas sampled. The groundwater samples had non detect (<0.5 ug/l) benzene, non detect (<0.8 mg/l) GRO, non detect (<0.667 mg/l) DRO, and non detect (<0.8 mg/l) RRO. Groundwater results are biased low due to headspace in the sample vials and not preserved in the field (high pH).	Robert Weimer
11/4/2008	Document, Report, or Work plan Review - other	Reviewed the 3/25/08 groundwater monitoring event report. Up to 10.2 ug/l benzene and 21.4 ug/l MTBE (470 ug/l cleanup level) in the groundwater. Contaminant concentrations increased in one of the three monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 6.01 to 8.06 feet below ground surface.	Robert Weimer
11/13/2008	Document, Report, or Work plan Review - other	Reviewed the 6/13/08 groundwater monitoring event report. Up to 15 ug/l benzene and 450 ug/l GRO in the groundwater. Contaminant concentrations increased in one of the four monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest during this monitoring event. Depth to groundwater was 4.74 to 6.75 feet below ground surface.	Robert Weimer
1/5/2009	Document, Report, or Work plan Review - other	Reviewed the 9/16/08 groundwater monitoring event report. Up to 25 ug/l benzene and non detect (<100 ug/l) GRO in the groundwater. Contaminant concentrations increased in one of the five monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest during this monitoring event. Depth to groundwater was 5.15 to 7.40 feet below ground surface.	Robert Weimer
4/1/2009	Meeting or Teleconference Held	Discussed with Texaco's consultant that they are working on getting site access for the off property monitoring wells. They hope to get access and install them in the summer of 2009.	Robert Weimer
4/1/2009	Document, Report, or Work plan Review - other	Reviewed the 12/1/08 groundwater monitoring event report. Up to 26 ug/l benzene and 460 ug/l GRO in the groundwater. Contaminant concentrations increased in two of the two monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the westerly direction during this monitoring event. Depth to groundwater was 6.68 to 7.58 feet below ground surface.	Robert Weimer
7/27/2009	Document, Report, or Work plan Review - other	Reviewed the 3/23/09 groundwater monitoring event report. Up to 53 ug/l benzene and 460 ug/l GRO in the groundwater. Contaminant concentrations increased in two of the two monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the westerly direction during this monitoring event. Depth to groundwater was 6.32 to 7.23 feet below ground surface.	Robert Weimer
8/21/2009	Document, Report, or Work plan Review - other	Reviewed the 6/12/09 groundwater monitoring event report. Up to 100 ug/l benzene, 350 ug/l GRO, 150 ug/l TBA, and 10 ug/l MTBE in the groundwater. Contaminant concentrations increased in two of the four monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the westerly direction during this monitoring event. Depth to groundwater was 6.04 to 8.07 feet below ground surface.	Robert Weimer
1/5/2010	Document, Report, or Work plan Review - other	Reviewed the 9/14/09 groundwater monitoring event report. Up to 78 ug/l benzene, non detect (<100 ug/l) GRO, 540 ug/l TBA, and 40 ug/l MTBE in the groundwater. Contaminant concentrations increased in 3 of the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the westerly direction during this monitoring event. Depth to groundwater was 5.79 to 8.06 feet below ground surface.	Robert Weimer
3/22/2010	Document, Report, or Work plan Review - other	Reviewed the 12/9/09 groundwater monitoring event report. Up to 61 ug/l benzene and non detect (<100 ug/l) GRO in the groundwater. Contaminant concentrations decreased in the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the westerly direction during this monitoring event. Depth to groundwater was 5.51 to 7.78 feet below ground surface.	Robert Weimer
5/5/2010	Document, Report, or Work plan Review - other	Reviewed the 3/19/10 groundwater monitoring event report. Up to 51 ug/l benzene and 2.3 mg/l GRO in the groundwater. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the west by northwest direction during this monitoring event. Depth to groundwater was 6.91 to 8.18 feet below ground surface. Need to continue quarterly groundwater monitoring until extent of groundwater contamination has been defined and stable trends have been demonstrated.	Robert Weimer
5/4/2011	Document, Report, or Work plan Review - other	Reviewed the 5/16/10 groundwater monitoring event report. Up to 31 ug/l benzene and non detect (<0.1 mg/l) GRO in the groundwater. Contaminant concentrations increased in 0 of the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the southwest direction during this monitoring event. Depth to groundwater was 4.95 to 7.05 feet below ground surface.	Robert Weimer
7/21/2011	Document, Report, or Work plan Review - other	Reviewed the 9/21/10 and 11/2/10 groundwater monitoring events report. Up to 2,000 ug/l benzene and non detect (<0.046 mg/l) GRO in the groundwater. Contaminant concentrations increased in 3 of the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest direction during these monitoring events. Depth to groundwater was 4.64 to 6.82 feet below ground surface.	Robert Weimer
12/19/2011	Document, Report, or Work plan Review - other	March 5, 2011 groundwater monitoring event report. Up to 8.67 ug/l benzene and 0.363 mg/l GRO in the groundwater. Contaminant concentrations increased in 1 of the 3 monitoring wells sampled. The previously most contaminated monitoring well (DMW-1) was not sampled this event. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 7.20 to 8.30 feet below ground surface (bgs). One monitoring well was no assessible because of snow and another monitoring well (DMW-1) was not sampled due to an obstruction at 5.25 feet bgs.	Robert Weimer
12/20/2011	Document, Report, or Work plan Review - other	May 24, 2011 groundwater monitoring event report. Up to 136 ug/l benzene and 5.31 mg/l GRO in the groundwater. Contaminant concentrations increased in 2 of the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the south direction during this monitoring event. Depth to groundwater was 5.02 to 6.14 feet below ground surface (bgs). One monitoring well was no assessible because of snow.	Robert Weimer
12/21/2011	Update or Other Action	ADEC approves reduction in groundwater monitoring at this site from quarterly to semi-annual and reduce analytical sampling to: DMW-1 and DMW-4C to just BTEX and GRO on a semi-annual basis, and DMW-2 and DMW-5 to just BTEX on a semi-annual basis.	Robert Weimer
7/17/2012	Document, Report, or Work plan Review - other	July 29, 2011 groundwater monitoring event report. Up to 92 ug/l benzene and 43.9 ug/l MTBE in the groundwater. Contaminant concentrations increased in 2 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west direction during this monitoring event. Depth to groundwater was 5.37 to 7.61 feet below ground surface (bgs). One monitoring well was no assessible.	Robert Weimer
7/17/2012	Document, Report, or Work plan Review - other	October 12, 2011 groundwater monitoring event report. Up to 166 ug/l benzene and 2.53 mg/l GRO in the groundwater. Contaminant concentrations increased in 3 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the north west direction during this monitoring event. Depth to groundwater was 5 to 8 feet below ground surface (bgs). One monitoring well was no assessible.	Robert Weimer
2/13/2013	Document, Report, or Work plan Review - other	April 25, 2012 groundwater monitoring event report. Up to 23 ug/l benzene and 0.718 mg/l GRO in the groundwater. Contaminant concentrations increased in 3 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 4 to 7 feet below ground surface (bgs). One monitoring well was no assessible.	Robert Weimer
3/22/2013	Update or Other Action	DEC request that all sites where there has been no purge groundwater sampling conducted during the last year, that for the next sampling event that they do both no purge then purge sampling from each monitoring well, so we evaluate on a site specific basis whether no purge sampling has provided comparable data. The post purge well sampling for VOCs would need to be conducted via hydrasleeve, bladder pump, or in well pump. Non VOC sampling can be collected with a bailer or peristaltic pump (in addition to the VOC methods) if desired. The specific sampling methods will need to be documented in the report and included field notes. If there is not enough time to do this adjustment for the planned sample event of March 26-April 4, then DEC requests that it be done on the following event.	Robert Weimer
4/1/2013	Update or Other Action	Approved request to conduct the first semi-annual monitoring event each year in May instead of seasonal March/April because of snow cover over some of the monitoring wells.	Robert Weimer
8/16/2013	Document, Report, or Work plan Review - other	Conditionally approved the proposed 2013 release investigation work under the following conditions: 1. Based on historical groundwater at the site being as shallow as 4 feet below ground surface (bgs), the screen intervals for the monitoring wells need to start at 4 feet bgs. 2. Many of the areas where soil samples are to be collected were excavated previously and filled with clean backfill. In those areas the samples need to be collected from non backfill soils unless there are higher field readings at shallower depths in the boring. 3. The highest field reading depth needs to be sampled in each boring. You may substitute one of the deepest proposed sample depths for that sample. The plan includes installing two additional long term monitoring wells, one temporary monitoring well, and collecting soil samples from 6 soil borings.	Robert Weimer
10/8/2013	Document, Report, or Work plan Review - other	October 3, 2012 groundwater monitoring event report. Up to 46 ug/l benzene and 0.240 mg/l GRO in the groundwater. Contaminant concentrations increased in 4 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 4 to 6 feet below ground surface (bgs). One monitoring well was not assessible (DMW-3). Groundwater samples were collected with Hydrasleeves without purging. Sampling interval information was not provided, results may be biased low if correct interval was not sampled.	Robert Weimer
3/7/2014	Document, Report, or Work plan Review - other	June 7, 2013 groundwater monitoring event report. Up to 11.1 ug/l benzene, 0.505 mg/l GRO, non detect (<0.762 mg/l) DRO, non detect (<1.0 mg/l) RRO, and 15.2 ug/l MTBE in the groundwater. Contaminant concentrations increased in 2 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 4 to 6 feet below ground surface (bgs). One monitoring well was not assessible (DMW-3). Groundwater samples were collected with Hydrasleeves without purging. Sampling interval information was not provided, results may be biased low if correct interval was not sampled.	Robert Weimer
3/12/2014	Document, Report, or Work plan Review - other	On September 6-11, 2013 seven soil borings were sampled, and three of them were converted into monitoring wells (MW-6, MW-7, and MW-8). Up to 0.189 mg/kg benzene (MW-6 at 10 feet bgs), non detect (<35.7 mg/kg) GRO, 11.0 mg/kg DRO, 97.6 mg/kg RRO, 0.0673 mg/kg EDB (MW-7 at 13 feet bgs - 0.00016 mg/kg cleanup level), 0.0451 mg/kg EDC (MW-7 at 13 feet bgs - 0.016 mg/kg cleanup level), non detect (<0.135 mg/kg) PCE, non detect (<0.135 mg/kg) MTBE, 6.65 mg/kg arsenic, 53.4 mg/kg chromium, and 5.84 mg/kg total lead. Groundwater was encountered at 5.2 to 6.95 feet below ground surface (bgs) in the soil borings. Monitoring well DMW-3 could not be located. Several of the sample locations were adjusted in the field because of utility/product piping/sve piping. MW-6 further to the south, MW-7 east by 7 feet, SB-6 south by 3 feet, and SB-5 to the west.	Robert Weimer
6/9/2014	Document, Report, or Work plan Review - other	October 17-21, 2013 groundwater monitoring event report. Up to 15.3 ug/l benzene, 0.358 mg/l GRO, 1.34 mg/l DRO, non detect (<2.0 ug/l) lead, and 1.71 mg/l RRO in the groundwater (MTBE analysis was not conducted during this event). The groundwater sampling included the three new monitoirng wells (MW-6, MW-7, and MW-8). Contaminant concentrations increased in 3 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northeast direction during this monitoring event. Depth to groundwater was 3.92 to 7.07 feet below ground surface (bgs). One monitoring well (DMW-3) was not assessible. Groundwater samples were collected with Hydrasleeves without purging and bladder pump after pumping. For both no-purge and purge sampling the sample interval information was not provided, results may be biased low if correct interval was not sampled.	Robert Weimer
10/20/2014	Offsite Soil or Groundwater Disposal Approved	ADEC approves request to treat 1 drum of contaminated purge water.	Robert Weimer
6/23/2015	Document, Report, or Work plan Review - other	April 8, 2014 groundwater monitoring event (monitoring well DMW-1 was sampled on June 17, 2014 because it was iced in) report. Up to 13 ug/l benzene, 0.708 mg/l GRO, 0.152 mg/l DRO, non detect (<2.0 ug/l) lead, and 0.207 mg/l RRO in the groundwater (MTBE analysis was not conducted during this event). Contaminant concentrations increased in 1 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 6.44 to 8.12 feet below ground surface (bgs). One monitoring well (DMW-3) was not assessible. Groundwater samples were collected bladder pump after pumping. The samples were collected from near the soil/water interface as required in 4 of the monitoring wells. The depth to the intake for the bladder pump was not documented correctly (the depth was above the groundwater) on monitoring wells DMW2, MW7, and MW8 so the results for those monitoring wells are considered biased low.	Robert Weimer
7/24/2015	Document, Report, or Work plan Review - other	October 7, 2014 groundwater monitoring event report. Up to 8.48 ug/l benzene, 0.995 mg/l GRO, 0.644 mg/l DRO, non detect (<10 ug/l) lead, and 0.197 mg/l RRO in the groundwater (MTBE analysis was not conducted during this event). Contaminant concentrations increased in 7 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 4.52 to 7.04 feet below ground surface (bgs). One monitoring well (DMW-3) was not assessible. Groundwater samples were collected bladder pump after pumping. The samples were collected from near the soil/water interface as required.	Robert Weimer
11/2/2015	Offsite Soil or Groundwater Disposal Approved	ADEC approves request to treat 1 drum of contaminated purge water at NCR's facility at 2020 Viking Drive.	Robert Weimer
1/27/2016	Document, Report, or Work plan Review - other	April 14, 2015 groundwater monitoring event report. Up to 34.9 ug/l benzene, 1.08 mg/l GRO, 2.49 mg/l DRO, non detect (<1 ug/l) lead, and 2.21 mg/l RRO in the groundwater (MTBE analysis was not conducted during this event). Contaminant concentrations increased in 7 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.52 to 8.23 feet below ground surface (bgs). One monitoring well (DMW-3) was not located. Groundwater samples were collected bladder pump after purging. The samples were collected from near the soil/water interface as required. The groundwater samples for monitoring wells DMW-1, DMW-4C, MW5, MW6, and MW7 are considered biased low because they arrived at the laboratory 3 to 4 days after sampling over temperature (7.7 degrees C). The over temperature was noted on the QA/QC checklist but not in the data quality section of the report.	Robert Weimer
3/4/2016	Document, Report, or Work plan Review - other	October 20, 2015 groundwater monitoring event report. Up to 31.1 ug/l benzene, 0.904 mg/l GRO, 1.06 mg/l DRO, 2.3 ug/l lead, and 1.28 mg/l RRO in the groundwater (MTBE analysis was not conducted during this event). Contaminant concentrations increased in 4 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.00 to 6.60 feet below ground surface (bgs). One monitoring well (DMW-3) was not located. Groundwater samples were collected submersible pump after purging. The samples were collected from near the top of the water column as required.	Robert Weimer
3/15/2016	Meeting or Teleconference Held	Teleconference with Shell and their consultant (GES) to discuss future site work for site closure. They will submit a work plan for the 2016 groundwater monitoring that will include analysis for PAHs. We discussed that the extent of the soil and groundwater contamination has not been defined and they will submit a work plan for soil borings and monitoring wells along the property boundary to the south and west or off-property monitoring wells in those directions (such as across Dimond Boulevard). DEC requested rose diagrams showing historical groundwater flow directions be included in future site monitoring report maps.	Robert Weimer
5/27/2016	Update or Other Action	Because of the past halogenated organic contamination at this site ADEC requested that the next groundwater monitoring event at this site include VOC analysis for EPA Method 8260. After the receiving the results of that sampling ADEC is requesting in 2016 an evaluation for the potential for BTEX, PAH, and VOC to impact to indoor air be conducted for this site.	Robert Weimer
7/27/2016	Document, Report, or Work plan Review - other	DEC requested revised work plan for PAH sampling of selected monitoring wells at this site to help assess current concentrations in the groundwater.	Robert Weimer
8/3/2016	Meeting or Teleconference Held	Teleconference with Shell and their consultant (GES) to discuss future site work for site closure. They will submit a revised work plan for the September/October 2016 groundwater monitoring to include PAHs. Rose diagrams showing historical groundwater flow directions are to be included in future site monitoring report maps. They will document which monitoring wells are damaged or not accessible, so they can be repaired, decommissioned, or possibly replaced. We discussed that the extent of the soil and groundwater contamination has not been defined and they will submit a work plan for soil borings and monitoring wells along the property boundary to the south and west or off-property monitoring wells in those directions (such as across Dimond Boulevard).	Robert Weimer
10/27/2016	Document, Report, or Work plan Review - other	April 2, 2016 groundwater monitoring event report. Up to 30.5 ug/l benzene, 0.642 mg/l GRO, 2.08 mg/l DRO, and 2.32 mg/l RRO in the groundwater (Lead and MTBE analysis was not conducted during this event). Contaminant concentrations increased in 4 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest during this monitoring event. Depth to groundwater was 5.41 to 8.32 feet below ground surface (bgs). One monitoring well (DMW-3) was not located. Groundwater samples were collected submersible pump after purging. The samples were collected from near the top of the water column as required. One of the two coolers arrived at the lab 4 days after sampling over temperature (7.7 degrees C) so those samples are considered biased low.	Robert Weimer
12/15/2016	Document, Report, or Work plan Review - other	Review of work plan for installation of monitoring wells to help define the extent of the soil and groundwater contamination to the south, west, and northwest of the contaminated areas. Need a revised work plan that includes the following: Full PAH analysis, soil and groundwater transport forms, 3 additional monitoring wells, soil sample at soil/water interface and another depth if it appears more contaminated, and don't hand auger to the soil/water interface.	Robert Weimer
12/15/2016	Document, Report, or Work plan Review - other	Teleconference with Shells consultant (GES) to discuss future site work for site closure. We discussed that the extent of the soil and groundwater contamination needs to be characterized before a site can be considered for closure. They will submit a proposal for DEC approval regarding future groundwater monitoring. They will submit and updated PAH sampling report with method detection limits. DEC is requesting a revised work plan for the installation of additional monitoring wells.	Robert Weimer
4/3/2017	Document, Report, or Work plan Review - other	October 4, 2016 groundwater monitoring event report. Up to 41.3 ug/l benzene, 0.374 mg/l GRO, 0.869 mg/l DRO, 1.4 ug/l naphthalene, 3.1 ug/l 1-methylnaphthalene, 37.6 ug/l MTBA, 0.34 ug/l 1,2-DCA, 93.2 ug/l (15 ug/l cleanup level) 1,2,4-trimethylbenzene, and 0.634 mg/l RRO in the groundwater. Contaminant concentrations increased in 6 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.40 to 7.78 feet below ground surface (bgs). One monitoring well (DMW-3) was not located. Groundwater samples were collected submersible pump after purging. The samples were collected from near the top of the water column as required. Sample MW-6 was not properly preserved (pH >2) in the field so it is considered biased low.	Robert Weimer
4/3/2017	Update or Other Action	DEC approves reduction in groundwater monitoring to the following sample analysis: DMW-1: DRO, RRO, full VOC (8260), and PAHs DMW-2: full VOC (8260) DMW-4C: full VOC (8260), and PAHs DMW-5: full VOC (8260) No analytical sampling is requested for monitoring wells DMW-6, DMW-7, and DMW-8.	Robert Weimer
8/7/2017	Document, Report, or Work plan Review - other	April 18-19, 2017 groundwater monitoring event. Up to 5.81 ug/l benzene, 0.134 mg/l GRO, 0.850 mg/l DRO, 0.570 mg/l RRO in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. Contaminant concentrations increased in 3 of the 5 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 3.86 to 8.10 feet below ground surface (bgs). Monitoring well (DMW-1) was not sampled, it was full of ice. Monitoring well MW-8 was not sampled due to failure of the sampling pump. Groundwater samples were collected submersible pump after purging. Since the samples were received over temperature at 7.1 degrees C five days after sampling the results are considered biased low.	Robert Weimer
8/8/2017	Meeting or Teleconference Held	Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they will continue to attempt to get off property access to define the extent of the soil and groundwater contamination at the site, if they are not able to get access then DEC could contact the property owner to see if it can help get access. Full VOC groundwater sampling to be conducted soon, may need vapor intrusion assessment of on-property building depending on the VOC results.	Robert Weimer
12/4/2017	Document, Report, or Work plan Review - other	October 3, 2017 groundwater monitoring event. Up to 14.6 ug/l benzene, 0.726 mg/l DRO, 2.0 mg/l RRO, 0.65 ug/l Naphthalene, 14.8 ug/l MTBE, and 0.88 ug/l 1-Methylnapthalene in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. Contaminant concentrations increased in 3 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.30 to 7.15 feet below ground surface (bgs). Groundwater samples were collected submersible pump after purging.	Robert Weimer
12/22/2017	Meeting or Teleconference Held	Teleconference with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they will continue to attempt to get off property access to define the extent of the soil and groundwater contamination at the site, if they are not able to get access then DEC could contact the property owner to see if it can help get access. Full VOC and PAH groundwater sampling to continue, may need vapor intrusion assessment of on-property building depending on the VOC results.	Robert Weimer
4/6/2018	Document, Report, or Work plan Review - other	DEC review and approval of April 6, 2018 revised well installation work plan. Work is to be conducted around April 18, 2018. The work plan proposes to install five additional downgradient monitoring wells and collect soil and groundwater samples to help define the extent of the remaining contamination. Three of the monitoring wells are to be installed on the property to the west.	Robert Weimer
4/18/2018	Site Visit	Site visit to observe the soil sampling and installation of the additional down gradient monitoring wells. Work was going slow due to cobbles.	Robert Weimer
4/18/2018	Meeting or Teleconference Held	Teleconference with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they have access to down gradient property and are to install monitoring wells soon and that if contamination remains off-property there would need to be a separate IC signed by that property owner for closure.	Robert Weimer
8/15/2018	Meeting or Teleconference Held	Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they need a minimum of four quarterly monitoring events of the newly installed monitoring wells along with the semi-annual sampling of the other site monitoring wells. They were not able to install one of the proposed monitoring wells due to utilities in that area so they will need a monitoring well across Dimond Boulevard or wait until the on-property monitoring wells in that direction are demonstrated below Table C cleanup levels to consider the site for IC closure. On all sites GES will provide a diagram showing the remaining soil contamination above migration to groundwater, human health, and maximum allowable cleanup levels.	Robert Weimer
11/1/2018	Document, Report, or Work plan Review - other	On April 18-20, 2018 four additional monitoring wells (MW-9, MW-10, MW-12, and MW-13) were installed. These monitoring wells were installed off-property just to the west of the gas station property. Two soil samples were collected from each monitoring well during installation. The soil samples were analyzed for VOCs, GRO, DRO, RRO, and PAHs. Up to 7.14 mg/kg GRO. 12.8 mg/kg DRO, 75.6 mg/kg RRO, 0.00474 mg/kg naphthalene, and 0.0102 mg/kg benzene. The rest of the compounds were non-detect or below current site cleanup levels. Groundwater was encountered between 4.5 to 7.5 feet below ground surface (bgs). The well screen intervals in all of the monitoring wells is 4 to 14 feet bgs.	Robert Weimer
11/5/2018	Offsite Soil or Groundwater Disposal Approved	DEC approved request for off-site treatment and disposal of 6 drums of soil cuttings and 1 drum of development water. The soil and water were generated during the April 2018 monitoring well installations.	Robert Weimer
12/12/2018	Document, Report, or Work plan Review - other	April 25, 2018 groundwater monitoring event. Up to 6.24 ug/l benzene, 0.0328 mg/l GRO, 0.487 mg/l DRO, 1.32 mg/l RRO, 0.143 ug/l Naphthalene, 28.3 ug/l MTBE, and 0.619 ug/l 1-Methylnapthalene in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. Contaminant concentrations increased in 3 of the 7 monitoring wells sampled. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 4.52 to 13.64 feet below ground surface (bgs). Groundwater samples were collected with a bladder pump after purging. The samples are potentially biased low because the depth of the sampling was not documented and the samples may not have been collected within the top foot of the water column as required.	Robert Weimer
1/17/2019	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77716 UST contamination.	Robert Weimer
2/20/2019	Document, Report, or Work plan Review - other	October 4-5, 2018 groundwater monitoring event. Up to 42.9 ug/l benzene, 0.0752 mg/l GRO, 1.31 mg/l DRO, 6.04 mg/l RRO, 0.229 ug/l Naphthalene, 30.3 ug/l MTBE, and 3.53 ug/l 1-Methylnapthalene in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. A sheen was noted on the surface of the water in monitoring well MW-4A which was not sampled during this monitoring event. Contaminant concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 4.89 to 7.45 feet below ground surface (bgs). Groundwater samples were collected with a bladder pump after purging in monitoring wells DMW-2 and MW-9 but the depth of the pump intake was not documented as being in the top foot of the water column as required, so the results in those monitoring wells may be biased low. Since monitoring well DMW-1, MW-10, MW-12, MW-13 samples were collected after purging using a bailer the volatile results from these monitoring wells may be biased low. A sheen was noted on the surface of the water in monitoring well MW-4A which was not sampled during this monitoring event, need to add this monitoring well to the groundwater sampling schedule.	Robert Weimer
8/27/2019	Document, Report, or Work plan Review - other	January 23, 2019 groundwater monitoring event. Up to 0.931 ug/l benzene, 0.025 mg/l GRO, 0.705 mg/l DRO, 1.01 mg/l RRO, 0.0385 ug/l Naphthalene, and 17.2 ug/l MTBE in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. Contaminant concentrations increased in 3 of the 3 monitoring wells sampled. Monitoring well MW-9 was not sampled this monitoring event because it could not be located. Groundwater flow was not determined this monitoring event. Depth to groundwater was 6.55 to 6.70 feet below ground surface (bgs). Groundwater samples were collected with a bladder pump after purging from the top foot of the water column as required.	Robert Weimer
8/27/2019	Document, Report, or Work plan Review - other	April 3, 2019 groundwater monitoring event. Up to 31.7 ug/l benzene, 0.0422 mg/l GRO, 0.417 mg/l DRO, 1.05 mg/l RRO, 5.16 ug/l Naphthalene, 43.6 ug/l MTBE, and 16.3 ug/l Ethylbenzene in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. Monitoring well MW-9 was not sampled this monitoring event because of ice in the monitoring well. The only time monitoring well MW-9 was sampled (10/04/2018) it had 36.7 ug/l benzene. No sheens were noted in any of the monitoring wells. Contaminant concentrations increased in 4 of the 8 monitoring wells sampled. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.55 to 8.23 feet below ground surface (bgs). Groundwater samples were collected with a bladder pump after purging from the top foot of the water column as required in the shallow monitoring wells. The deep monitoring well MW-4A that is screened between 25-30 feet below ground surface (bgs) had its sample collected at 8.5 bgs instead of within the top foot of the screened interval as required.	Robert Weimer
8/28/2019	Meeting or Teleconference Held	Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they need a summer monitoring event in 2020 of the newly installed monitoring wells along with the semi-annual sampling of the other site monitoring wells. They will submit a work plan for the installation of a downgradient monitoring well across Dimond Boulevard (sampled for a minimum of 4 quarters) or wait until the on-property monitoring wells in that direction are demonstrated below Table C cleanup levels to consider the site for IC closure. GES will provide a diagram showing the remaining soil contamination above migration to groundwater, human health, and maximum allowable cleanup levels. We discussed that the deeper monitoring well MW-4A need to have the pump intake between 25 to 26' bgs so it is purging and collecting water from the top foot of the screened interval.	Robert Weimer
8/4/2020	Document, Report, or Work plan Review - other	The ADEC sent a comment letter regarding the submitted groundwater monitoring report dated November 27, 2019.	Randy Guintu
8/24/2020	Meeting or Teleconference Held	Meeting with Shell and their consultant, GES to discuss site conditions, pending actions and future work at multiple sites. It was discussed that sites must be characterized both vertically and horizontally in all contaminated media to move forward with site closure with institutional controls (ICs). To move forward with site closure with ICs would also require landowner and stakeholder concurrence and the required documentation under the Uniform Environmental Covenants Act. Other discussions involved what steps needed to be taken to continue monitoring and sampling where necessary.	Randy Guintu
3/5/2021	Site Characterization Report Approved	The ADEC issued a report approval letter for the revised Second Semiannual 2019 Groundwater Monitoring Report on March 5, 2021.	Randy Guintu
9/7/2021	Document, Report, or Work plan Review - other	ADEC received a work plan from Shell's consultant, GES. The work plan proposes installing a new monitoring well, MW-14, to the southwest of the site across Dimond Boulevard, pending approval from the business owner.	Flannery Ballard
9/24/2021	Update or Other Action	The ADEC issued a comment letter in response to the Work Plan for Well Installation, requesting additional information concerning the contaminants to be tested, methodology, soil sampling intervals, and waste disposal plan. The ADEC also asked for clarification on whether all wells will be sampled if proposed well, MW-14, is installed to the southwest of the site. Lastly, the ADEC noted that the location of the proposed well is at such as distance from the site, that it it may not provide sufficient data to adequately delineate the contaminant plume. The ADEC recommended the RP and consultant consider coordinating with the Alaska Department of Transportation to inquire whether a sampling event might be possible in the right-of-way or in E. Dimond Blvd.	Flannery Ballard
10/4/2021	Document, Report, or Work plan Review - other	GES consultants submitted a letter addressing ADEC's comments in regards to the Work Plan for Well Installation for MW-14. The ADEC is reviewing the response letter.	Flannery Ballard
10/20/2021	Update or Other Action	ADEC issued a letter of approval for the installation of monitoring well (MW-14) to the south of the site. The consultant, GES, is still waiting for property owner approval.	Flannery Ballard
3/23/2022	Site Characterization Report Approved	The ADEC approved the "Second Semiannual 2021 Groundwater Monitoring Report". Groundwater samples were collected from nine monitoring wells, DMW-1, DMW-2, DMW-4A, DMW-4C, DMW-5, MW-9, MW-10, MW-12, and MW-13. Benzene was detected in MW-9 at a concentration of 20.2 micrograms per liter (ug/L), which is greater than the ADEC groundwater cleanup level of 4.6 ug/L. The ADEC agrees with the recommendation to continue semiannual groundwater monitoring at the site until the constituents of potential concern (COPCs) are at concentrations less than the ADEC groundwater cleanup levels or show a stable or decreasing trend that may be acceptable for closure with institutional controls.	Flannery Ballard
1/13/2023	Site Characterization Report Approved	The ADEC approved the "First Semiannual 2022 Groundwater Monitoring Report". Groundwater samples were collected from nine monitoring wells, DMW-1, DMW-2, DMW-4A, DMW-4C, DMW-5, MW-9, MW-10, MW-12, and MW-13. Benzene was detected in MW-9 at a concentration of 17.2 micrograms per liter (ug/L), which is greater than the ADEC groundwater cleanup level of 4.6 ug/L. The ADEC agrees with the recommendation to continue semiannual groundwater monitoring at the site until the constituents of potential concern (COPCs) are at concentrations less than the ADEC groundwater cleanup levels or show a stable or decreasing trend that may be acceptable for closure with institutional controls. In addition, the ADEC agrees with the recommendation to remove PAHs from the analytical sampling list. PAHs have not been detected at the site above the ADEC cleanup levels with the exception of one detection of naphthalene in DMW-4C in April 2019	Alena Voigt
5/5/2023	Site Characterization Report Approved	The ADEC CSP reviewed the “Second Semiannual 2022 Groundwater Monitoring Report”, dated January 12, 2023, from Groundwater & Environmental Services, Inc. (GES). The report discusses the latest groundwater monitoring and sampling event at the Texaco - #91 Oehrlis site on October 10 - 11, 2022. Groundwater samples were collected from nine monitoring wells, DMW-1, DMW-2, DMW-4A, DMW-4C, DMW-5, MW-9, MW-10, MW-12, and MW-13. Samples were analyzed for GRO, DRO, RRO, VOCS, and PAHs. Benzene was detected in MW-9 at a concentration of 8.06 micrograms per liter (ug/L), which is greater than the ADEC Table C cleanup level of 4.6 ug/L. In addition, RRO was detected in MW-13 at a concentration of 1,730 ug/L, greater than the ADEC Table C cleanup level of 1,100 ug/L. The remaining tested analytes were either not detected or were detected at concentrations less than the applicable cleanup levels. Groundwater flow direction is to the west. The ADEC agrees with the recommendation to continue semiannual groundwater monitoring at the site. In addition, the ADEC agrees with the recommendation to remove PAHs from the analytical sampling list. PAHs have not been detected at the site above the ADEC cleanup levels with the exception of one detection in DMW-4C in April 2019. The ADEC requests an updated work plan to reflect the recommendation above and be submitted for review to the CSP.	Alena Voigt
9/15/2023	Update or Other Action	The ADEC CSP reviewed the “First Semiannual 2023 Groundwater Monitoring Report”, dated June 14, 2023, received on July 14, 2023, via electronic mail, from Groundwater & Environmental Services, Inc. (GES). The ADEC provided comments to the responsible party and environmental consultant and requested a revised report be submitted to the CSP for review.	Alena Voigt
9/29/2023	Meeting or Teleconference Held	Teleconference held with GES, Shell, ADEC PM and Supervisor regarding site and path towards closure.	Alena Voigt
12/28/2023	Site Characterization Report Approved	The ADEC CSP received the revised report from GES on December 4, 2023. Groundwater samples were collected from nine monitoring wells, DMW-1, DMW-2, DMW-4A, DMW-4C, DMW-5, MW-9, MW-10, MW-12, and MW-13. Samples were analyzed for GRO, DRO, RRO, and VOCs. Benzene was detected in MW-5 and MW-9 at concentrations of 10.3 micrograms per liter (ug/L) and 12.1 ug/L, respectively, greater than the ADEC Table C cleanup level of 4.6 ug/L. In addition, naphthalene was detected in DMW-1 (2.20 ug/L) greater than the ADEC Table C cleanup level of 1.7 ug/L. The remaining tested analytes were either not detected or were detected at concentrations less than the applicable cleanup levels. Groundwater flow direction is to the west.	Alena Voigt
12/28/2023	Site Characterization Workplan Approved	The ADEC CSP reviewed the "2023 Updated Groundwater Monitoring Workplan" received by GES. The work plan recommends removing polycyclic aromatic hydrocarbons (PAHs) from the analytical sampling list. PAHs have not been detected at the site above the ADEC cleanup levels with the exception of one detection in DMW-4C in April 2019.Groundwater monitoring wells identified as DMW-1, DMW-2, DMW-4A, DMW-4C, DMW-5, MW-9, MW-10, MW-12, and MW-13 will be sampled on a semi-annual schedule and analyzed for gasoline range organics (GRO), diesel range organics (DRO), residual range organics (RRO), and volatile organic compounds (VOCs).	Alena Voigt

Action Date

Action

Description

DEC Staff

7/6/1990

Underground Storage Tank Site Characterization or Assessment

ENSR Consultants submit a workplan to ADEC for UST removal and site characterization. Approved by ADEC with stipulations. Station being upgraded.

Former Staff

7/9/1990

Leaking Underground Storage Tank Corrective Action Underway

Gasoline and diesel contaminated soils approved by ADEC for thermal treatment at AS&G. AS&G processed 1,077 tons on 7/28/90.

Former Staff

7/10/1990

Site Added to Database

Former Staff

7/10/1990

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 77716 Used oil, chlorinated solvents, gasoline and diesel contaminants.

Former Staff

7/11/1990

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

LCAU Date changed DB conversion

Former Staff

9/11/1990

Update or Other Action

ENSR sends lab data that shows 100 ppb tetrachloroethylene in soils. Propose to process used oil contaminated soil through AK Pollution Control. APC will thermally treat soils to a level so they can be disposed of at the Anchorage Regional Landfill.

Former Staff

9/21/1990

Update or Other Action

Permission to transport used oil contaminated soils to AK Pollution Control in Palmer for thermal treatment granted after lab results were received.

Former Staff

10/2/1990

Document, Report, or Work plan Review - other

ENSR consulting environmental assessment report states that contaminated soils above 100 mg/kg were removed during tank/piping excavation. Groundwater is about 10 feet below the surface and flows towards the northwest and southwest. Benzene ranging from 2.8 ug/l to 16.0 ug/l was found in the four on-site monitoring wells in August 1990.

Former Staff

3/22/1991

Update or Other Action

ENSR submits a plan which proposes a vapor extraction system for the former pump island & gasoline tank areas. For the used oil tank area it's recommended that in situ biological treatment for the contaminated soils in that area.

Former Staff

11/20/1997

Update or Other Action

ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TEXACO REFINING & MARKETING INC.

Former Staff

7/26/2000

Update or Other Action

ADEC letter requesting corrective action plan for the remaining soil and groundwater contamination, and a work plan for additional monitoring well installation to help define the extent of contamination.

Robert Weimer

6/7/2004

Document, Report, or Work plan Review - other

Reviewed quarterly groundwater monitoring report. Up to 62 ug/l benzene and 6,000 ug/l GRO in the groundwater. Contaminant concentrations are increasing in some monitoring wells and the extent of the contamination has not been defined.

Robert Weimer

9/29/2004

Document, Report, or Work plan Review - other

Reviewed quarterly groundwater monitoring report. Up to 64 ug/l benzene and 110 ug/l GRO in the groundwater. Contaminant concentrations are increasing in one monitoring well and the extent of the contamination has not been defined.

Robert Weimer

11/18/2004

Document, Report, or Work plan Review - other

Reviewed quarterly groundwater monitoring report. Up to 65 ug/l benzene and 110 ug/l GRO in the groundwater. Contaminant concentrations are increasing in one monitoring well and the extent of the contamination has not been defined.

Robert Weimer

1/21/2005

Document, Report, or Work plan Review - other

Reviewed the December 1, 2004 groundwater monitoring event report. Up to 52 ug/l benzene and 170 ug/l GRO in the groundwater. Contaminant concentrations are increasing in one monitoring well and the extent of the contamination has not been defined.

Robert Weimer

5/13/2005

Document, Report, or Work plan Review - other

Reviewed the March 8, 2005 groundwater monitoring event report. Up to 120 ug/l benzene and 530 ug/l GRO in the groundwater. Contaminant concentrations are increasing and the extent of the contamination to the west and southwest has not been defined.

Robert Weimer

9/16/2005

Document, Report, or Work plan Review - other

Reviewed the June 8, 2005 groundwater monitoring event report. Up to 170 ug/l benzene and 1,000 ug/l GRO in the groundwater. Contaminant concentrationsare increasing and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest this monitoring event.

Robert Weimer

12/8/2005

Document, Report, or Work plan Review - other

Reviewed the 9/24/05 groundwater monitoring event report. Up to 170 ug/l benzene and 1,000 ug/l GRO in the groundwater. Contaminant concentrations are stable and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the southwest this monitoring event. Depth to groundwater was 5 to 7 feet below ground surface.

Robert Weimer

1/19/2006

Update or Other Action

ADEC issues approval of release investigation workplan for the installation of two additional monitoring wells located just to the west of the Service Station.

Robert Weimer

1/24/2006

Document, Report, or Work plan Review - other

Reviewed the 12/03/05 groundwater monitoring event report. Up to 73.3 ug/l benzene and 454 ug/l GRO in the groundwater. Contaminant concentrations appear stable and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the southwest this monitoring event. Depth to groundwater was 5 to 7 feet below ground surface.

Robert Weimer

5/12/2006

Document, Report, or Work plan Review - other

Reviewed the 3/21/06 groundwater monitoring event report. Up to 73.3 ug/l benzene and 830 ug/l GRO in the groundwater. Contaminant concentrations appear stable and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the southwest this monitoring event. Depth to groundwater was 6 to 9 feet below ground surface.

Robert Weimer

11/21/2006

Document, Report, or Work plan Review - other

Reviewed the 9/25/06 groundwater monitoring event report. Up to 43.1 ug/l benzene and 168 ug/l GRO in the groundwater. Contaminant concentrations appear stable and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the south by southwest this monitoring event. Depth to groundwater was 7 to 8 feet below ground surface.

Robert Weimer

3/8/2007

Exposure Tracking Model Ranking

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

Robert Weimer

4/10/2007

Document, Report, or Work plan Review - other

Reviewed the 12/12/06 groundwater monitoring event report. Up to 17 ug/l benzene and 4,510 ug/l GRO in the groundwater. Contaminant concentrations appear to be increasing and the extent of the contamination to the west and southwest has not been defined. Groundwater flow is generally to the south by southwest. Depth to groundwater was 6.2 to 7.7 feet below ground surface.

Robert Weimer

5/4/2007

Update or Other Action

ADEC approves request for no-purge groundwater sampling for this site.

Robert Weimer

12/17/2007

Document, Report, or Work plan Review - other

Reviewed the 3/29/07 groundwater monitoring event report. Up to 26 ug/l benzene and 4,510 ug/l GRO (from the 12/12/06 monitoring event) in the groundwater. Contaminant concentrations appear to be increasing and the extent of the contamination to the west and southwest has not been defined. Groundwater flow is generally to the south by southwest. Depth to groundwater was 6.4 to 8.7 feet below ground surface.

Robert Weimer

2/4/2008

Document, Report, or Work plan Review - other

Reviewed the 6/21/07 groundwater monitoring event report. Up to 40.1 ug/l benzene and 4,510 ug/l GRO (from 12/12/06 monitoring event) in the groundwater. Contaminant concentrations appear to be increasing and the extent of the contamination to the west and southwest has not been defined. Groundwater flow is generally to the south by southwest. Depth to groundwater was 6.1 to 6.34 feet below ground surface.

Robert Weimer

2/5/2008

Document, Report, or Work plan Review - other

Reviewed the 9/26/07 groundwater monitoring event report. Up to 86.9 ug/l benzene and 194 ug/l GRO in the groundwater. Contaminant concentrations appear to be increasing and the extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.78 to 7.99 feet below ground surface.

Robert Weimer

4/28/2008

Document, Report, or Work plan Review - other

Reviewed the 12/13/07 groundwater monitoring event report. Up to 45.2 ug/l benzene and 290 ug/l GRO in the groundwater. Contaminant concentrations increased in one of the three monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest during this monitoring event. Depth to groundwater was 6.51 to 7.85 feet below ground surface.

Robert Weimer

4/28/2008

Document, Report, or Work plan Review - other

A property transfer Phase II environmental assessment was conducted on January 25-29, 2008. Five soil borings were drilled and one groundwater sample was collected. The soil borings had 1.8 mg/kg benzene, 60.8 mg/kg GRO, 64.5 mg/kg DRO, 82.5 mg/kg RRO and up to 7.22 mg/kg lead in the areas sampled. The groundwater samples had non detect (<0.5 ug/l) benzene, non detect (<0.8 mg/l) GRO, non detect (<0.667 mg/l) DRO, and non detect (<0.8 mg/l) RRO. Groundwater results are biased low due to headspace in the sample vials and not preserved in the field (high pH).

Robert Weimer

11/4/2008

Document, Report, or Work plan Review - other

Reviewed the 3/25/08 groundwater monitoring event report. Up to 10.2 ug/l benzene and 21.4 ug/l MTBE (470 ug/l cleanup level) in the groundwater. Contaminant concentrations increased in one of the three monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 6.01 to 8.06 feet below ground surface.

Robert Weimer

11/13/2008

Document, Report, or Work plan Review - other

Reviewed the 6/13/08 groundwater monitoring event report. Up to 15 ug/l benzene and 450 ug/l GRO in the groundwater. Contaminant concentrations increased in one of the four monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest during this monitoring event. Depth to groundwater was 4.74 to 6.75 feet below ground surface.

Robert Weimer

1/5/2009

Document, Report, or Work plan Review - other

Reviewed the 9/16/08 groundwater monitoring event report. Up to 25 ug/l benzene and non detect (<100 ug/l) GRO in the groundwater. Contaminant concentrations increased in one of the five monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest during this monitoring event. Depth to groundwater was 5.15 to 7.40 feet below ground surface.

Robert Weimer

4/1/2009

Meeting or Teleconference Held

Discussed with Texaco's consultant that they are working on getting site access for the off property monitoring wells. They hope to get access and install them in the summer of 2009.

Robert Weimer

4/1/2009

Document, Report, or Work plan Review - other

Reviewed the 12/1/08 groundwater monitoring event report. Up to 26 ug/l benzene and 460 ug/l GRO in the groundwater. Contaminant concentrations increased in two of the two monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the westerly direction during this monitoring event. Depth to groundwater was 6.68 to 7.58 feet below ground surface.

Robert Weimer

7/27/2009

Document, Report, or Work plan Review - other

Reviewed the 3/23/09 groundwater monitoring event report. Up to 53 ug/l benzene and 460 ug/l GRO in the groundwater. Contaminant concentrations increased in two of the two monitoring well sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the westerly direction during this monitoring event. Depth to groundwater was 6.32 to 7.23 feet below ground surface.

Robert Weimer

8/21/2009

Document, Report, or Work plan Review - other

Reviewed the 6/12/09 groundwater monitoring event report. Up to 100 ug/l benzene, 350 ug/l GRO, 150 ug/l TBA, and 10 ug/l MTBE in the groundwater. Contaminant concentrations increased in two of the four monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the westerly direction during this monitoring event. Depth to groundwater was 6.04 to 8.07 feet below ground surface.

Robert Weimer

1/5/2010

Document, Report, or Work plan Review - other

Reviewed the 9/14/09 groundwater monitoring event report. Up to 78 ug/l benzene, non detect (<100 ug/l) GRO, 540 ug/l TBA, and 40 ug/l MTBE in the groundwater. Contaminant concentrations increased in 3 of the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the westerly direction during this monitoring event. Depth to groundwater was 5.79 to 8.06 feet below ground surface.

Robert Weimer

3/22/2010

Document, Report, or Work plan Review - other

Reviewed the 12/9/09 groundwater monitoring event report. Up to 61 ug/l benzene and non detect (<100 ug/l) GRO in the groundwater. Contaminant concentrations decreased in the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the westerly direction during this monitoring event. Depth to groundwater was 5.51 to 7.78 feet below ground surface.

Robert Weimer

5/5/2010

Document, Report, or Work plan Review - other

Reviewed the 3/19/10 groundwater monitoring event report. Up to 51 ug/l benzene and 2.3 mg/l GRO in the groundwater. Contaminant concentrations increased in 1 of the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the west by northwest direction during this monitoring event. Depth to groundwater was 6.91 to 8.18 feet below ground surface. Need to continue quarterly groundwater monitoring until extent of groundwater contamination has been defined and stable trends have been demonstrated.

Robert Weimer

5/4/2011

Document, Report, or Work plan Review - other

Reviewed the 5/16/10 groundwater monitoring event report. Up to 31 ug/l benzene and non detect (<0.1 mg/l) GRO in the groundwater. Contaminant concentrations increased in 0 of the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the southwest direction during this monitoring event. Depth to groundwater was 4.95 to 7.05 feet below ground surface.

Robert Weimer

7/21/2011

Document, Report, or Work plan Review - other

Reviewed the 9/21/10 and 11/2/10 groundwater monitoring events report. Up to 2,000 ug/l benzene and non detect (<0.046 mg/l) GRO in the groundwater. Contaminant concentrations increased in 3 of the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest direction during these monitoring events. Depth to groundwater was 4.64 to 6.82 feet below ground surface.

Robert Weimer

12/19/2011

Document, Report, or Work plan Review - other

March 5, 2011 groundwater monitoring event report. Up to 8.67 ug/l benzene and 0.363 mg/l GRO in the groundwater. Contaminant concentrations increased in 1 of the 3 monitoring wells sampled. The previously most contaminated monitoring well (DMW-1) was not sampled this event. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 7.20 to 8.30 feet below ground surface (bgs). One monitoring well was no assessible because of snow and another monitoring well (DMW-1) was not sampled due to an obstruction at 5.25 feet bgs.

Robert Weimer

12/20/2011

Document, Report, or Work plan Review - other

May 24, 2011 groundwater monitoring event report. Up to 136 ug/l benzene and 5.31 mg/l GRO in the groundwater. Contaminant concentrations increased in 2 of the 4 monitoring wells sampled. The extent of the contamination to the west and southwest has not been defined. Groundwater flow was to the south direction during this monitoring event. Depth to groundwater was 5.02 to 6.14 feet below ground surface (bgs). One monitoring well was no assessible because of snow.

Robert Weimer

12/21/2011

Update or Other Action

ADEC approves reduction in groundwater monitoring at this site from quarterly to semi-annual and reduce analytical sampling to: DMW-1 and DMW-4C to just BTEX and GRO on a semi-annual basis, and DMW-2 and DMW-5 to just BTEX on a semi-annual basis.

Robert Weimer

7/17/2012

Document, Report, or Work plan Review - other

July 29, 2011 groundwater monitoring event report. Up to 92 ug/l benzene and 43.9 ug/l MTBE in the groundwater. Contaminant concentrations increased in 2 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west direction during this monitoring event. Depth to groundwater was 5.37 to 7.61 feet below ground surface (bgs). One monitoring well was no assessible.

Robert Weimer

7/17/2012

Document, Report, or Work plan Review - other

October 12, 2011 groundwater monitoring event report. Up to 166 ug/l benzene and 2.53 mg/l GRO in the groundwater. Contaminant concentrations increased in 3 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the north west direction during this monitoring event. Depth to groundwater was 5 to 8 feet below ground surface (bgs). One monitoring well was no assessible.

Robert Weimer

2/13/2013

Document, Report, or Work plan Review - other

April 25, 2012 groundwater monitoring event report. Up to 23 ug/l benzene and 0.718 mg/l GRO in the groundwater. Contaminant concentrations increased in 3 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 4 to 7 feet below ground surface (bgs). One monitoring well was no assessible.

Robert Weimer

3/22/2013

Update or Other Action

DEC request that all sites where there has been no purge groundwater sampling conducted during the last year, that for the next sampling event that they do both no purge then purge sampling from each monitoring well, so we evaluate on a site specific basis whether no purge sampling has provided comparable data. The post purge well sampling for VOCs would need to be conducted via hydrasleeve, bladder pump, or in well pump. Non VOC sampling can be collected with a bailer or peristaltic pump (in addition to the VOC methods) if desired. The specific sampling methods will need to be documented in the report and included field notes. If there is not enough time to do this adjustment for the planned sample event of March 26-April 4, then DEC requests that it be done on the following event.

Robert Weimer

4/1/2013

Update or Other Action

Approved request to conduct the first semi-annual monitoring event each year in May instead of seasonal March/April because of snow cover over some of the monitoring wells.

Robert Weimer

8/16/2013

Document, Report, or Work plan Review - other

Conditionally approved the proposed 2013 release investigation work under the following conditions: 1. Based on historical groundwater at the site being as shallow as 4 feet below ground surface (bgs), the screen intervals for the monitoring wells need to start at 4 feet bgs. 2. Many of the areas where soil samples are to be collected were excavated previously and filled with clean backfill. In those areas the samples need to be collected from non backfill soils unless there are higher field readings at shallower depths in the boring. 3. The highest field reading depth needs to be sampled in each boring. You may substitute one of the deepest proposed sample depths for that sample. The plan includes installing two additional long term monitoring wells, one temporary monitoring well, and collecting soil samples from 6 soil borings.

Robert Weimer

10/8/2013

Document, Report, or Work plan Review - other

October 3, 2012 groundwater monitoring event report. Up to 46 ug/l benzene and 0.240 mg/l GRO in the groundwater. Contaminant concentrations increased in 4 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 4 to 6 feet below ground surface (bgs). One monitoring well was not assessible (DMW-3). Groundwater samples were collected with Hydrasleeves without purging. Sampling interval information was not provided, results may be biased low if correct interval was not sampled.

Robert Weimer

3/7/2014

Document, Report, or Work plan Review - other

June 7, 2013 groundwater monitoring event report. Up to 11.1 ug/l benzene, 0.505 mg/l GRO, non detect (<0.762 mg/l) DRO, non detect (<1.0 mg/l) RRO, and 15.2 ug/l MTBE in the groundwater. Contaminant concentrations increased in 2 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 4 to 6 feet below ground surface (bgs). One monitoring well was not assessible (DMW-3). Groundwater samples were collected with Hydrasleeves without purging. Sampling interval information was not provided, results may be biased low if correct interval was not sampled.

Robert Weimer

3/12/2014

Document, Report, or Work plan Review - other

On September 6-11, 2013 seven soil borings were sampled, and three of them were converted into monitoring wells (MW-6, MW-7, and MW-8). Up to 0.189 mg/kg benzene (MW-6 at 10 feet bgs), non detect (<35.7 mg/kg) GRO, 11.0 mg/kg DRO, 97.6 mg/kg RRO, 0.0673 mg/kg EDB (MW-7 at 13 feet bgs - 0.00016 mg/kg cleanup level), 0.0451 mg/kg EDC (MW-7 at 13 feet bgs - 0.016 mg/kg cleanup level), non detect (<0.135 mg/kg) PCE, non detect (<0.135 mg/kg) MTBE, 6.65 mg/kg arsenic, 53.4 mg/kg chromium, and 5.84 mg/kg total lead. Groundwater was encountered at 5.2 to 6.95 feet below ground surface (bgs) in the soil borings. Monitoring well DMW-3 could not be located. Several of the sample locations were adjusted in the field because of utility/product piping/sve piping. MW-6 further to the south, MW-7 east by 7 feet, SB-6 south by 3 feet, and SB-5 to the west.

Robert Weimer

6/9/2014

Document, Report, or Work plan Review - other

October 17-21, 2013 groundwater monitoring event report. Up to 15.3 ug/l benzene, 0.358 mg/l GRO, 1.34 mg/l DRO, non detect (<2.0 ug/l) lead, and 1.71 mg/l RRO in the groundwater (MTBE analysis was not conducted during this event). The groundwater sampling included the three new monitoirng wells (MW-6, MW-7, and MW-8). Contaminant concentrations increased in 3 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northeast direction during this monitoring event. Depth to groundwater was 3.92 to 7.07 feet below ground surface (bgs). One monitoring well (DMW-3) was not assessible. Groundwater samples were collected with Hydrasleeves without purging and bladder pump after pumping. For both no-purge and purge sampling the sample interval information was not provided, results may be biased low if correct interval was not sampled.

Robert Weimer

10/20/2014

Offsite Soil or Groundwater Disposal Approved

ADEC approves request to treat 1 drum of contaminated purge water.

Robert Weimer

6/23/2015

Document, Report, or Work plan Review - other

April 8, 2014 groundwater monitoring event (monitoring well DMW-1 was sampled on June 17, 2014 because it was iced in) report. Up to 13 ug/l benzene, 0.708 mg/l GRO, 0.152 mg/l DRO, non detect (<2.0 ug/l) lead, and 0.207 mg/l RRO in the groundwater (MTBE analysis was not conducted during this event). Contaminant concentrations increased in 1 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 6.44 to 8.12 feet below ground surface (bgs). One monitoring well (DMW-3) was not assessible. Groundwater samples were collected bladder pump after pumping. The samples were collected from near the soil/water interface as required in 4 of the monitoring wells. The depth to the intake for the bladder pump was not documented correctly (the depth was above the groundwater) on monitoring wells DMW2, MW7, and MW8 so the results for those monitoring wells are considered biased low.

Robert Weimer

7/24/2015

Document, Report, or Work plan Review - other

October 7, 2014 groundwater monitoring event report. Up to 8.48 ug/l benzene, 0.995 mg/l GRO, 0.644 mg/l DRO, non detect (<10 ug/l) lead, and 0.197 mg/l RRO in the groundwater (MTBE analysis was not conducted during this event). Contaminant concentrations increased in 7 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest direction during this monitoring event. Depth to groundwater was 4.52 to 7.04 feet below ground surface (bgs). One monitoring well (DMW-3) was not assessible. Groundwater samples were collected bladder pump after pumping. The samples were collected from near the soil/water interface as required.

Robert Weimer

11/2/2015

Offsite Soil or Groundwater Disposal Approved

ADEC approves request to treat 1 drum of contaminated purge water at NCR's facility at 2020 Viking Drive.

Robert Weimer

1/27/2016

Document, Report, or Work plan Review - other

April 14, 2015 groundwater monitoring event report. Up to 34.9 ug/l benzene, 1.08 mg/l GRO, 2.49 mg/l DRO, non detect (<1 ug/l) lead, and 2.21 mg/l RRO in the groundwater (MTBE analysis was not conducted during this event). Contaminant concentrations increased in 7 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.52 to 8.23 feet below ground surface (bgs). One monitoring well (DMW-3) was not located. Groundwater samples were collected bladder pump after purging. The samples were collected from near the soil/water interface as required. The groundwater samples for monitoring wells DMW-1, DMW-4C, MW5, MW6, and MW7 are considered biased low because they arrived at the laboratory 3 to 4 days after sampling over temperature (7.7 degrees C). The over temperature was noted on the QA/QC checklist but not in the data quality section of the report.

Robert Weimer

3/4/2016

Document, Report, or Work plan Review - other

October 20, 2015 groundwater monitoring event report. Up to 31.1 ug/l benzene, 0.904 mg/l GRO, 1.06 mg/l DRO, 2.3 ug/l lead, and 1.28 mg/l RRO in the groundwater (MTBE analysis was not conducted during this event). Contaminant concentrations increased in 4 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.00 to 6.60 feet below ground surface (bgs). One monitoring well (DMW-3) was not located. Groundwater samples were collected submersible pump after purging. The samples were collected from near the top of the water column as required.

Robert Weimer

3/15/2016

Meeting or Teleconference Held

Teleconference with Shell and their consultant (GES) to discuss future site work for site closure. They will submit a work plan for the 2016 groundwater monitoring that will include analysis for PAHs. We discussed that the extent of the soil and groundwater contamination has not been defined and they will submit a work plan for soil borings and monitoring wells along the property boundary to the south and west or off-property monitoring wells in those directions (such as across Dimond Boulevard). DEC requested rose diagrams showing historical groundwater flow directions be included in future site monitoring report maps.

Robert Weimer

5/27/2016

Update or Other Action

Because of the past halogenated organic contamination at this site ADEC requested that the next groundwater monitoring event at this site include VOC analysis for EPA Method 8260. After the receiving the results of that sampling ADEC is requesting in 2016 an evaluation for the potential for BTEX, PAH, and VOC to impact to indoor air be conducted for this site.

Robert Weimer

7/27/2016

Document, Report, or Work plan Review - other

DEC requested revised work plan for PAH sampling of selected monitoring wells at this site to help assess current concentrations in the groundwater.

Robert Weimer

8/3/2016

Meeting or Teleconference Held

Teleconference with Shell and their consultant (GES) to discuss future site work for site closure. They will submit a revised work plan for the September/October 2016 groundwater monitoring to include PAHs. Rose diagrams showing historical groundwater flow directions are to be included in future site monitoring report maps. They will document which monitoring wells are damaged or not accessible, so they can be repaired, decommissioned, or possibly replaced. We discussed that the extent of the soil and groundwater contamination has not been defined and they will submit a work plan for soil borings and monitoring wells along the property boundary to the south and west or off-property monitoring wells in those directions (such as across Dimond Boulevard).

Robert Weimer

10/27/2016

Document, Report, or Work plan Review - other

April 2, 2016 groundwater monitoring event report. Up to 30.5 ug/l benzene, 0.642 mg/l GRO, 2.08 mg/l DRO, and 2.32 mg/l RRO in the groundwater (Lead and MTBE analysis was not conducted during this event). Contaminant concentrations increased in 4 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the northwest during this monitoring event. Depth to groundwater was 5.41 to 8.32 feet below ground surface (bgs). One monitoring well (DMW-3) was not located. Groundwater samples were collected submersible pump after purging. The samples were collected from near the top of the water column as required. One of the two coolers arrived at the lab 4 days after sampling over temperature (7.7 degrees C) so those samples are considered biased low.

Robert Weimer

12/15/2016

Document, Report, or Work plan Review - other

Review of work plan for installation of monitoring wells to help define the extent of the soil and groundwater contamination to the south, west, and northwest of the contaminated areas. Need a revised work plan that includes the following: Full PAH analysis, soil and groundwater transport forms, 3 additional monitoring wells, soil sample at soil/water interface and another depth if it appears more contaminated, and don't hand auger to the soil/water interface.

Robert Weimer

12/15/2016

Document, Report, or Work plan Review - other

Teleconference with Shells consultant (GES) to discuss future site work for site closure. We discussed that the extent of the soil and groundwater contamination needs to be characterized before a site can be considered for closure. They will submit a proposal for DEC approval regarding future groundwater monitoring. They will submit and updated PAH sampling report with method detection limits. DEC is requesting a revised work plan for the installation of additional monitoring wells.

Robert Weimer

4/3/2017

Document, Report, or Work plan Review - other

October 4, 2016 groundwater monitoring event report. Up to 41.3 ug/l benzene, 0.374 mg/l GRO, 0.869 mg/l DRO, 1.4 ug/l naphthalene, 3.1 ug/l 1-methylnaphthalene, 37.6 ug/l MTBA, 0.34 ug/l 1,2-DCA, 93.2 ug/l (15 ug/l cleanup level) 1,2,4-trimethylbenzene, and 0.634 mg/l RRO in the groundwater. Contaminant concentrations increased in 6 of the 7 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.40 to 7.78 feet below ground surface (bgs). One monitoring well (DMW-3) was not located. Groundwater samples were collected submersible pump after purging. The samples were collected from near the top of the water column as required. Sample MW-6 was not properly preserved (pH >2) in the field so it is considered biased low.

Robert Weimer

4/3/2017

Update or Other Action

DEC approves reduction in groundwater monitoring to the following sample analysis: DMW-1: DRO, RRO, full VOC (8260), and PAHs DMW-2: full VOC (8260) DMW-4C: full VOC (8260), and PAHs DMW-5: full VOC (8260) No analytical sampling is requested for monitoring wells DMW-6, DMW-7, and DMW-8.

Robert Weimer

8/7/2017

Document, Report, or Work plan Review - other

April 18-19, 2017 groundwater monitoring event. Up to 5.81 ug/l benzene, 0.134 mg/l GRO, 0.850 mg/l DRO, 0.570 mg/l RRO in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. Contaminant concentrations increased in 3 of the 5 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 3.86 to 8.10 feet below ground surface (bgs). Monitoring well (DMW-1) was not sampled, it was full of ice. Monitoring well MW-8 was not sampled due to failure of the sampling pump. Groundwater samples were collected submersible pump after purging. Since the samples were received over temperature at 7.1 degrees C five days after sampling the results are considered biased low.

Robert Weimer

8/8/2017

Meeting or Teleconference Held

Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they will continue to attempt to get off property access to define the extent of the soil and groundwater contamination at the site, if they are not able to get access then DEC could contact the property owner to see if it can help get access. Full VOC groundwater sampling to be conducted soon, may need vapor intrusion assessment of on-property building depending on the VOC results.

Robert Weimer

12/4/2017

Document, Report, or Work plan Review - other

October 3, 2017 groundwater monitoring event. Up to 14.6 ug/l benzene, 0.726 mg/l DRO, 2.0 mg/l RRO, 0.65 ug/l Naphthalene, 14.8 ug/l MTBE, and 0.88 ug/l 1-Methylnapthalene in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. Contaminant concentrations increased in 3 of the 4 monitoring wells sampled. The extent of the contamination to the south and west has not been defined. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.30 to 7.15 feet below ground surface (bgs). Groundwater samples were collected submersible pump after purging.

Robert Weimer

12/22/2017

Meeting or Teleconference Held

Teleconference with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they will continue to attempt to get off property access to define the extent of the soil and groundwater contamination at the site, if they are not able to get access then DEC could contact the property owner to see if it can help get access. Full VOC and PAH groundwater sampling to continue, may need vapor intrusion assessment of on-property building depending on the VOC results.

Robert Weimer

4/6/2018

Document, Report, or Work plan Review - other

DEC review and approval of April 6, 2018 revised well installation work plan. Work is to be conducted around April 18, 2018. The work plan proposes to install five additional downgradient monitoring wells and collect soil and groundwater samples to help define the extent of the remaining contamination. Three of the monitoring wells are to be installed on the property to the west.

Robert Weimer

4/18/2018

Site Visit

Site visit to observe the soil sampling and installation of the additional down gradient monitoring wells. Work was going slow due to cobbles.

Robert Weimer

4/18/2018

Meeting or Teleconference Held

Teleconference with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they have access to down gradient property and are to install monitoring wells soon and that if contamination remains off-property there would need to be a separate IC signed by that property owner for closure.

Robert Weimer

8/15/2018

Meeting or Teleconference Held

Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they need a minimum of four quarterly monitoring events of the newly installed monitoring wells along with the semi-annual sampling of the other site monitoring wells. They were not able to install one of the proposed monitoring wells due to utilities in that area so they will need a monitoring well across Dimond Boulevard or wait until the on-property monitoring wells in that direction are demonstrated below Table C cleanup levels to consider the site for IC closure. On all sites GES will provide a diagram showing the remaining soil contamination above migration to groundwater, human health, and maximum allowable cleanup levels.

Robert Weimer

11/1/2018

Document, Report, or Work plan Review - other

On April 18-20, 2018 four additional monitoring wells (MW-9, MW-10, MW-12, and MW-13) were installed. These monitoring wells were installed off-property just to the west of the gas station property. Two soil samples were collected from each monitoring well during installation. The soil samples were analyzed for VOCs, GRO, DRO, RRO, and PAHs. Up to 7.14 mg/kg GRO. 12.8 mg/kg DRO, 75.6 mg/kg RRO, 0.00474 mg/kg naphthalene, and 0.0102 mg/kg benzene. The rest of the compounds were non-detect or below current site cleanup levels. Groundwater was encountered between 4.5 to 7.5 feet below ground surface (bgs). The well screen intervals in all of the monitoring wells is 4 to 14 feet bgs.

Robert Weimer

11/5/2018

Offsite Soil or Groundwater Disposal Approved

DEC approved request for off-site treatment and disposal of 6 drums of soil cuttings and 1 drum of development water. The soil and water were generated during the April 2018 monitoring well installations.

Robert Weimer

12/12/2018

Document, Report, or Work plan Review - other

April 25, 2018 groundwater monitoring event. Up to 6.24 ug/l benzene, 0.0328 mg/l GRO, 0.487 mg/l DRO, 1.32 mg/l RRO, 0.143 ug/l Naphthalene, 28.3 ug/l MTBE, and 0.619 ug/l 1-Methylnapthalene in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. Contaminant concentrations increased in 3 of the 7 monitoring wells sampled. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 4.52 to 13.64 feet below ground surface (bgs). Groundwater samples were collected with a bladder pump after purging. The samples are potentially biased low because the depth of the sampling was not documented and the samples may not have been collected within the top foot of the water column as required.

Robert Weimer

1/17/2019

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77716 UST contamination.

Robert Weimer

2/20/2019

Document, Report, or Work plan Review - other

October 4-5, 2018 groundwater monitoring event. Up to 42.9 ug/l benzene, 0.0752 mg/l GRO, 1.31 mg/l DRO, 6.04 mg/l RRO, 0.229 ug/l Naphthalene, 30.3 ug/l MTBE, and 3.53 ug/l 1-Methylnapthalene in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. A sheen was noted on the surface of the water in monitoring well MW-4A which was not sampled during this monitoring event. Contaminant concentrations increased in 4 of the 6 monitoring wells sampled. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 4.89 to 7.45 feet below ground surface (bgs). Groundwater samples were collected with a bladder pump after purging in monitoring wells DMW-2 and MW-9 but the depth of the pump intake was not documented as being in the top foot of the water column as required, so the results in those monitoring wells may be biased low. Since monitoring well DMW-1, MW-10, MW-12, MW-13 samples were collected after purging using a bailer the volatile results from these monitoring wells may be biased low. A sheen was noted on the surface of the water in monitoring well MW-4A which was not sampled during this monitoring event, need to add this monitoring well to the groundwater sampling schedule.

Robert Weimer

8/27/2019

Document, Report, or Work plan Review - other

January 23, 2019 groundwater monitoring event. Up to 0.931 ug/l benzene, 0.025 mg/l GRO, 0.705 mg/l DRO, 1.01 mg/l RRO, 0.0385 ug/l Naphthalene, and 17.2 ug/l MTBE in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. Contaminant concentrations increased in 3 of the 3 monitoring wells sampled. Monitoring well MW-9 was not sampled this monitoring event because it could not be located. Groundwater flow was not determined this monitoring event. Depth to groundwater was 6.55 to 6.70 feet below ground surface (bgs). Groundwater samples were collected with a bladder pump after purging from the top foot of the water column as required.

Robert Weimer

8/27/2019

Document, Report, or Work plan Review - other

April 3, 2019 groundwater monitoring event. Up to 31.7 ug/l benzene, 0.0422 mg/l GRO, 0.417 mg/l DRO, 1.05 mg/l RRO, 5.16 ug/l Naphthalene, 43.6 ug/l MTBE, and 16.3 ug/l Ethylbenzene in the groundwater. The other VOCs and PAHs were either non-detect or below current cleanup levels. Monitoring well MW-9 was not sampled this monitoring event because of ice in the monitoring well. The only time monitoring well MW-9 was sampled (10/04/2018) it had 36.7 ug/l benzene. No sheens were noted in any of the monitoring wells. Contaminant concentrations increased in 4 of the 8 monitoring wells sampled. Groundwater flow was to the west during this monitoring event. Depth to groundwater was 5.55 to 8.23 feet below ground surface (bgs). Groundwater samples were collected with a bladder pump after purging from the top foot of the water column as required in the shallow monitoring wells. The deep monitoring well MW-4A that is screened between 25-30 feet below ground surface (bgs) had its sample collected at 8.5 bgs instead of within the top foot of the screened interval as required.

Robert Weimer

8/28/2019

Meeting or Teleconference Held

Meeting with Shell with Shells consultant (GES) to discuss future site work for site closure. We discussed that they need a summer monitoring event in 2020 of the newly installed monitoring wells along with the semi-annual sampling of the other site monitoring wells. They will submit a work plan for the installation of a downgradient monitoring well across Dimond Boulevard (sampled for a minimum of 4 quarters) or wait until the on-property monitoring wells in that direction are demonstrated below Table C cleanup levels to consider the site for IC closure. GES will provide a diagram showing the remaining soil contamination above migration to groundwater, human health, and maximum allowable cleanup levels. We discussed that the deeper monitoring well MW-4A need to have the pump intake between 25 to 26' bgs so it is purging and collecting water from the top foot of the screened interval.

Robert Weimer

8/4/2020

Document, Report, or Work plan Review - other

The ADEC sent a comment letter regarding the submitted groundwater monitoring report dated November 27, 2019.

Randy Guintu

8/24/2020

Meeting or Teleconference Held

Meeting with Shell and their consultant, GES to discuss site conditions, pending actions and future work at multiple sites. It was discussed that sites must be characterized both vertically and horizontally in all contaminated media to move forward with site closure with institutional controls (ICs). To move forward with site closure with ICs would also require landowner and stakeholder concurrence and the required documentation under the Uniform Environmental Covenants Act. Other discussions involved what steps needed to be taken to continue monitoring and sampling where necessary.

Randy Guintu

3/5/2021

Site Characterization Report Approved

The ADEC issued a report approval letter for the revised Second Semiannual 2019 Groundwater Monitoring Report on March 5, 2021.

Randy Guintu

9/7/2021

Document, Report, or Work plan Review - other

ADEC received a work plan from Shell's consultant, GES. The work plan proposes installing a new monitoring well, MW-14, to the southwest of the site across Dimond Boulevard, pending approval from the business owner.

Flannery Ballard

9/24/2021

Update or Other Action

The ADEC issued a comment letter in response to the Work Plan for Well Installation, requesting additional information concerning the contaminants to be tested, methodology, soil sampling intervals, and waste disposal plan. The ADEC also asked for clarification on whether all wells will be sampled if proposed well, MW-14, is installed to the southwest of the site. Lastly, the ADEC noted that the location of the proposed well is at such as distance from the site, that it it may not provide sufficient data to adequately delineate the contaminant plume. The ADEC recommended the RP and consultant consider coordinating with the Alaska Department of Transportation to inquire whether a sampling event might be possible in the right-of-way or in E. Dimond Blvd.

Flannery Ballard

10/4/2021

Document, Report, or Work plan Review - other

GES consultants submitted a letter addressing ADEC's comments in regards to the Work Plan for Well Installation for MW-14. The ADEC is reviewing the response letter.

Flannery Ballard

10/20/2021

Update or Other Action

ADEC issued a letter of approval for the installation of monitoring well (MW-14) to the south of the site. The consultant, GES, is still waiting for property owner approval.

Flannery Ballard

3/23/2022

Site Characterization Report Approved

The ADEC approved the "Second Semiannual 2021 Groundwater Monitoring Report". Groundwater samples were collected from nine monitoring wells, DMW-1, DMW-2, DMW-4A, DMW-4C, DMW-5, MW-9, MW-10, MW-12, and MW-13. Benzene was detected in MW-9 at a concentration of 20.2 micrograms per liter (ug/L), which is greater than the ADEC groundwater cleanup level of 4.6 ug/L. The ADEC agrees with the recommendation to continue semiannual groundwater monitoring at the site until the constituents of potential concern (COPCs) are at concentrations less than the ADEC groundwater cleanup levels or show a stable or decreasing trend that may be acceptable for closure with institutional controls.

Flannery Ballard

1/13/2023

Site Characterization Report Approved

The ADEC approved the "First Semiannual 2022 Groundwater Monitoring Report". Groundwater samples were collected from nine monitoring wells, DMW-1, DMW-2, DMW-4A, DMW-4C, DMW-5, MW-9, MW-10, MW-12, and MW-13. Benzene was detected in MW-9 at a concentration of 17.2 micrograms per liter (ug/L), which is greater than the ADEC groundwater cleanup level of 4.6 ug/L. The ADEC agrees with the recommendation to continue semiannual groundwater monitoring at the site until the constituents of potential concern (COPCs) are at concentrations less than the ADEC groundwater cleanup levels or show a stable or decreasing trend that may be acceptable for closure with institutional controls. In addition, the ADEC agrees with the recommendation to remove PAHs from the analytical sampling list. PAHs have not been detected at the site above the ADEC cleanup levels with the exception of one detection of naphthalene in DMW-4C in April 2019

Alena Voigt

5/5/2023

Site Characterization Report Approved

The ADEC CSP reviewed the “Second Semiannual 2022 Groundwater Monitoring Report”, dated January 12, 2023, from Groundwater & Environmental Services, Inc. (GES). The report discusses the latest groundwater monitoring and sampling event at the Texaco - #91 Oehrlis site on October 10 - 11, 2022. Groundwater samples were collected from nine monitoring wells, DMW-1, DMW-2, DMW-4A, DMW-4C, DMW-5, MW-9, MW-10, MW-12, and MW-13. Samples were analyzed for GRO, DRO, RRO, VOCS, and PAHs. Benzene was detected in MW-9 at a concentration of 8.06 micrograms per liter (ug/L), which is greater than the ADEC Table C cleanup level of 4.6 ug/L. In addition, RRO was detected in MW-13 at a concentration of 1,730 ug/L, greater than the ADEC Table C cleanup level of 1,100 ug/L. The remaining tested analytes were either not detected or were detected at concentrations less than the applicable cleanup levels. Groundwater flow direction is to the west. The ADEC agrees with the recommendation to continue semiannual groundwater monitoring at the site. In addition, the ADEC agrees with the recommendation to remove PAHs from the analytical sampling list. PAHs have not been detected at the site above the ADEC cleanup levels with the exception of one detection in DMW-4C in April 2019. The ADEC requests an updated work plan to reflect the recommendation above and be submitted for review to the CSP.

Alena Voigt

9/15/2023

Update or Other Action

The ADEC CSP reviewed the “First Semiannual 2023 Groundwater Monitoring Report”, dated June 14, 2023, received on July 14, 2023, via electronic mail, from Groundwater & Environmental Services, Inc. (GES). The ADEC provided comments to the responsible party and environmental consultant and requested a revised report be submitted to the CSP for review.

Alena Voigt

9/29/2023

Meeting or Teleconference Held

Teleconference held with GES, Shell, ADEC PM and Supervisor regarding site and path towards closure.

Alena Voigt

12/28/2023

Site Characterization Report Approved

The ADEC CSP received the revised report from GES on December 4, 2023. Groundwater samples were collected from nine monitoring wells, DMW-1, DMW-2, DMW-4A, DMW-4C, DMW-5, MW-9, MW-10, MW-12, and MW-13. Samples were analyzed for GRO, DRO, RRO, and VOCs. Benzene was detected in MW-5 and MW-9 at concentrations of 10.3 micrograms per liter (ug/L) and 12.1 ug/L, respectively, greater than the ADEC Table C cleanup level of 4.6 ug/L. In addition, naphthalene was detected in DMW-1 (2.20 ug/L) greater than the ADEC Table C cleanup level of 1.7 ug/L. The remaining tested analytes were either not detected or were detected at concentrations less than the applicable cleanup levels. Groundwater flow direction is to the west.

Alena Voigt

12/28/2023

Site Characterization Workplan Approved

The ADEC CSP reviewed the "2023 Updated Groundwater Monitoring Workplan" received by GES. The work plan recommends removing polycyclic aromatic hydrocarbons (PAHs) from the analytical sampling list. PAHs have not been detected at the site above the ADEC cleanup levels with the exception of one detection in DMW-4C in April 2019.Groundwater monitoring wells identified as DMW-1, DMW-2, DMW-4A, DMW-4C, DMW-5, MW-9, MW-10, MW-12, and MW-13 will be sampled on a semi-annual schedule and analyzed for gasoline range organics (GRO), diesel range organics (DRO), residual range organics (RRO), and volatile organic compounds (VOCs).

Alena Voigt

Contaminant Information

Name

Level Description

Media

Comments

Control Type

Type

Details

Requirements

Description

Details

Second Semiannual 2021 Groundwater Monitoring Report

November 2018 Groundwater Monitoring report

No associated sites were found.

Missing Location Data

Because the GIS location data for this site has not been entered, we cannot direct you to its position on the map. Click "Continue" to proceed to the Contaminated Sites Web Map or "Close" to return to the site report.

Continue Close

Alaska Department of Environmental Conservation

Site Report: Texaco - #91 Oehrlis

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

Second Semiannual 2021 Groundwater Monitoring Report

November 2018 Groundwater Monitoring report

Missing Location Data

State of Alaska Department of Environmental Conservation