Site Report: Texaco #90 901 East 15th

Site Name:	Texaco #90 901 East 15th
Address:	901 East 15th Ave.; , Anchorage, AK 99501
File Number:	2100.26.107
Hazard ID:	24059
Status:	Active
Staff:	Alena Voigt, 9072697556 alena.voigt@alaska.gov
Latitude:	61.207888
Longitude:	-149.866542
Horizontal Datum:	NAD83

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

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

In 1990 contamination was found during upgrade of gasoline tank system. Additional contamination found at used oil buried drum area. Excavated contaminated soil was thermally treated and disposed of at the landfill. Monitoring wells were installed in 1991. The shallow groundwater flows to the southwest. A soil vapor extraction system began operation in 1994 and operated until 2000. On October 2011 four soil borings were sampled and one monitoring well (MW-5) was installed and sampled. The sampling was conducted to help assess the current concentrations of contaminants in some of the areas of the site that had previously shown contamination over site cleanup levels. On September 2013 two soil borings SB-A (near TI-29 at 6.5 feet below ground surface) and SB-B (near WO-2 at 7 feet below ground surface) were sampled to help assess the current concentrations of contaminants in some of the areas. Two of the areas planned to be sampled that had identified contamination over cleanup levels in the past have not had confirmation samples collected yet and will need further assessment to evaluate the site for closure: Former buried drum area (TI-4 and its surrounding area) and former UST excavation (near T1-3). May need additional assessment at TI-29 area. DEC requested work plan for conducting site characterization at the tank, dispenser, and buried drum areas.

Action Information

Action Date	Action	Description	DEC Staff
8/2/1989	Site Visit	Site visit during tank removal noted visual and olfactory evidence of petroleum contaminated soil.	Ron Godden
8/2/1990	Underground Storage Tank Site Characterization or Assessment	Site assessment report for upgrade of gasoline UST system.	Former Staff
8/2/1990	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 78437 Gasoline contamination.	Former Staff
8/2/1990	Site Added to Database		Former Staff
8/3/1990	Leaking Underground Storage Tank Cleanup Initiated - Petroleum	LCAU Date changed DB conversion.	Former Staff
8/10/1990	Update or Other Action	ADEC letter to Texaco requesting workplans for release investigation and corrective action for the remaining contamination at the site.	John Halverson
9/17/1990	Update or Other Action	ENSR to have AK Pollution Control remove, treat, then dispose of the contaminated soils at the Anchorage Municipality landfill. ADEC approval sent on 09/21/90.	John Halverson
9/21/1990	Update or Other Action	ADEC approves transport and treatment of used oil contaminated soil.	John Halverson
10/2/1990	Update or Other Action	ADEC approves thermal treatment of gasoline contaminated soil from the site.	John Halverson
11/8/1990	Document, Report, or Work plan Review - other	ENSR Environmental assessment report for site: total petroleum hydrocarbon levels in fuel oil excavation were from 28 to 113 mg/kg, in area found to contain buried drums were 27 to 973 mg/kg. Groundwater samples collected from the 3 monitoring wells were non detectable for BETX .	Former Staff
12/11/1990	Update or Other Action	ADEC letter sent out requesting plans for additional assessment and or cleanup by 1-25-91. ENSR documents from disposal of waste oil contaminated soil disposal at landfill after treatment at the AK Pollution Control facility in Palmer received by ADEC on 4/12/91. The letter also noted QA/QC problems with some of the samples collected.	John Halverson
12/14/1990	Document, Report, or Work plan Review - other	12/14/90 groundwater monitoring event. The three site monitoring wells sampled were all non-detect (<1.0 ug/l) benzene in the groundwater. Corrected groundwater flow direction is to the southwest.	Robert Weimer
2/20/1991	Update or Other Action	ADEC letter sent to Texaco conditionally approving plan (received on 2/20/91). The results of additional testing & assessment work be sent for review & approval along with final plans for the design, installation & operation of the remediation systems.	Former Staff
2/22/1991	Document, Report, or Work plan Review - other	2/22/91 groundwater monitoring event. The three monitoring wells were sampled were all non-detect (<1.0 ug/l) benzene in the groundwater. Groundwater flowed to the southwest.	Robert Weimer
3/8/1991	Document, Report, or Work plan Review - other	Texaco's consultant provides documentation of the disposal at the MOA landfill of soil treated at APC.	Robert Weimer
4/19/1991	Update or Other Action	ADEC letter approving corrective action plan. The plan calls for using a vapor extraction system (VES) to treat the remaining soil contamination at the tanks and disenser islands. VES piping was installed beneath the new tanks and dispensers.	John Halverson
4/26/1991	Document, Report, or Work plan Review - other	A fourth monitoring well (TI-4) was installed on 4/26/91. This monitoring well was installed on the east side of the former buried drum exavation (located on the northeast corner of the property). Soil samples collected during the installation of the monitoring well had up to 2,690 mg/kg DRO, and non-detect (<0.02 mg/kg) benzene. Contamination over cleanup levels was found from 2.5 to 9.5 feet below ground surface (bgs) and 15 to 24.5 feet bgs. Groundwater was encountered at 23 feet bgs. The extent of the contamination has not been defined.	Robert Weimer
5/22/1991	Document, Report, or Work plan Review - other	5/22/91 groundwater monitoring event. Four monitoring wells were sampled, they were all non-detect (<1.0 ug/l) for benzene in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.58 to 22.48 feet below ground surface.	Robert Weimer
11/8/1991	Document, Report, or Work plan Review - other	11/8/91 groundwater monitoring event. Four monitoring wells were sampled, they were all non-detect (<1.0 ug/l) for benzene in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.78 to 22.30 feet below ground surface.	Robert Weimer
10/20/1992	Document, Report, or Work plan Review - other	10/20/92 groundwater monitoring event. Four monitoring wells were sampled. Up to 34 ug/l benzene and 0.077 mg/l GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.5 to 22.27 feet below ground surface.	Robert Weimer
1/19/1993	Document, Report, or Work plan Review - other	1/19/93 groundwater monitoring event. Four monitoring wells were sampled. Up to 0.6 ug/l benzene and 0.044 mg/l GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.49 to 22.25 feet below ground surface.	Robert Weimer
4/27/1993	Document, Report, or Work plan Review - other	4/27/93 groundwater monitoring event. Four monitoring wells were sampled. Up to 1 ug/l benzene and 0.05 mg/l GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.28 to 22.11 feet below ground surface.	Robert Weimer
7/8/1993	Document, Report, or Work plan Review - other	7/8/93 groundwater monitoring event. Four monitoring wells were sampled. Up to 0.4 ug/l benzene and non-detect (<0.01 mg/l) GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.23 to 21.73 feet below ground surface.	Robert Weimer
8/26/1993	Document, Report, or Work plan Review - other	The soil vapor extraction system (VES) began operation on August 26, 1993. Between 8/23/93 and 1/6/94 the VES system removed 513 pounds of gasoline. The VES is hooked up to piping at both pump islands, the northern portion of the tank area, and monitoring well T1-4 located at the former buried drum area.	Robert Weimer
10/29/1993	Document, Report, or Work plan Review - other	10/29/93 groundwater monitoring event. Four monitoring wells were sampled, they were all non-detect (<0.3 ug/l) for benzene and non-detect (<0.01 mg/l) for GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.21 to 21.63 feet below ground surface.	Robert Weimer
4/6/1994	Document, Report, or Work plan Review - other	4/6/94 groundwater monitoring event. Two monitoring wells were sampled (two others were covered with snow). They were both non-detect (<1 ug/l) for benzene and non-detect (<0.05 mg/l) for GRO in the groundwater. Groundwater historically has flowed to the southwest. Depth to groundwater was 21.85 to 21.91 feet below ground surface.	Robert Weimer
7/16/1994	Document, Report, or Work plan Review - other	7/16/94 groundwater monitoring event. Four monitoring wells were sampled, they were all non-detect (<0.5 ug/l) benzene and non-detect (<0.05 mg/l) GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.71 to 22.28 feet below ground surface.	Robert Weimer
12/13/1994	Document, Report, or Work plan Review - other	12/36/94 groundwater monitoring event. Four monitoring wells were sampled, they were all non-detect (<0.5 ug/l) benzene and non-detect (<0.05 mg/l) GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 22.09 to 22.75 feet below ground surface.	Robert Weimer
2/10/1995	Update or Other Action	ADEC letter approving suspending GRO analysis in all monitoring wells, and BTEX in monitoring wells T1-1 and T1-3. ADEC requests that all monitoring wells be sampled for TPH and monitoring well T1-4 for DRO and TPH. ADEC also requests VES system reports be submitted on a quarterly basis.	Robert Weimer
4/5/1995	Document, Report, or Work plan Review - other	4/5/95 groundwater monitoring event. Three monitoring wells were sampled (monitoring well T1-4 was not sampled due to snow). They were non-detect (<0.5 ug/l) for benzene and non-detect (<0.05 mg/l) for GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 22.21 to 22.80 feet below ground surface.	Robert Weimer
6/19/1995	Document, Report, or Work plan Review - other	6/19/95 groundwater monitoring event. Four monitoring wells were sampled. Up to non-detect (<0.5 ug/l) benzene, 0.5 mg/l DRO, and non-detect (<0.25 mg/l) TPH in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.6 to 22.21 feet below ground surface.	Robert Weimer
9/19/1995	Document, Report, or Work plan Review - other	9/19/95 groundwater monitoring event. Four monitoring wells were sampled. Up to non-detect (<0.5 ug/l) benzene, 1.3 mg/l DRO, and 1.6 mg/l TPH in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 22.0 to 24.58 feet below ground surface. The dilution valve has been open on the VES system since 5/25/95.	Robert Weimer
11/26/1996	Update or Other Action	ADEC letter requests that monitoring wells T1-3 and T1-4 be sampled for DRO. ADEC also requests a confirmation soil sampling plan for the areas previously identified as having soil contamination over cleanup levels. The letter notes that the 9/23/96 sampling of the former drum area was not adequatelty assessed, it was dug in the wrong location and was only sampled at 3.5 to 4 feet below ground surface. The letter also noted that the site assessment for used oil tank that was removed on 9/19/96 was not complete.	Robert Weimer
1/23/1997	Document, Report, or Work plan Review - other	Summary report for the removal of a 500 gallon used oil tank, 2 floor hoists, a sand trap, and a test pit near the former buried drum area on 9/23/96. The assessment of the buried drum area appears to be in the wrong location and to be too shallow (only 3.5 to 4 feet below ground surface-the previous excavation showed contamination also at the base at 8 feet bgs). Up to non-detect (<0.05 mg/kg) benzene, non-detect (<5 mg/kg) GRO, and 61.6 mg/kg at the sand trap excavation. Up to non-detect (<0.05 mg/kg) benzene, non-detect (<5 mg/kg) GRO, and 11.5 DRO mg/kg DRO at the floor hoists. Up to non-detect (<0.05 mg/kg) benzene, non-detect (<5 mg/kg) GRO, and 5.22 mg/kg DRO at the samples collected near the former buried drums, but the buried drum assessment was not complete and further assessment is required. Up to non-detect (<0.05 mg/kg) benzene, non-detect (<5 mg/kg) GRO, and 7.07 mg/kg DRO at the samples collected in the used oil tank excavation.	Robert Weimer
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 requests a workplan for assessment at the drum area, a workplan for confirmation soil samples, and monitoring well sampling.	Robert Weimer
8/9/2001	Document, Report, or Work plan Review - other	8/9/01 groundwater monitoring event. One monitoring well was sampled (T1-3). Up to 0.144 mg/l DRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21.92 to 22.16 feet below ground surface.	Robert Weimer
8/31/2004	Update or Other Action	Soil contamination remains at former buried drum area and former/current UST gasoline system. There is also 0.05 mg/kg benzene on the excavation north wall of the former fuel oil tank (located on the north side of the building near the west corner).	Robert Weimer
10/24/2005	Update or Other Action	Need soil confirmation samples to assess that remains at former buried drum area and former/current UST gasoline system. Also at the north sidewall of the former fuel oil tank (located on the north side of the building).	Robert Weimer
3/1/2007	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. (Gasoline tanks and drum areas)	Robert Weimer
10/24/2008	Document, Report, or Work plan Review - other	Review of Phase II Report dated February 28, 2008 for the 901 East 15th Avenue property. The report documents the sampling of 6 soil borings and the collection of one groundwater sample at the site on January 21, 2008. While the sampling found no detectable petroleum contamination at the locations and depths sampled, the soil benzene detection limits (0.05 mg/kg and 0.06 mg/kg) did not meet our laboratory requirements so we it does not demonstrate that the benzene contamination remaining is below site cleanup levels (0.025 mg/kg). In addition the areas sampled were not close enough to assess the areas previously identified as having contamination above site cleanup levels. Additional confirmation sampling will be required the evaluate this site for closure.	Robert Weimer
12/2/2008	Update or Other Action	File review to determine where confirmation sampling is needed for site closure. At minimum need: 1. Gasoline tank (TI-3) 20ft and soil/water interface for BTEX/GRO. 2. South dispenser island (TI-32) 6ft for BTEX/GRO. 3. South dispenser island (boring TI-B1) 21ft, soil/water interface, and the highest field screening depth shallower than 21ft all for BTEX/GRO. This boring to be completed as a monitoring well with a water sample collected for BTEX/GRO. 4. Fuel oil tank (TI-20) highest field screening within 8 feet for BTEX. 5. Drum area (TI-34) 8ft for BTEX/GRO/DRO/RRO/Total Arsenic/Total Chromium. 6. Drum area (TI-38) 4ft for BTEX/GRO/DRO/RRO/Total Arsenic/Total Chromium. 7. Drum area (Boring TI-4) 21, the highest field screening depth shallower than 21ft, and the soil water interface for BTEX/GRO/DRO/RRO/Total Arsenic/Total Chromium. This boring needs to be completed as a monitoring well, with a groundwater sample collected for BTEX/GRO/DRO/RRO. Monitoring wells need to be completed so that additional future groundwater monitoring events can be conducted if necessary.	Robert Weimer
2/12/2009	Update or Other Action	Discussed with Texaco's consultant that they need to do further assessment and groundwater monitoring at the site.	Robert Weimer
4/1/2009	Meeting or Teleconference Held	Discussed with Texaco's consultant (Delta) that they are stilling waiting direction from Texaco as to which consultant will take the lead on this site.	Robert Weimer
4/22/2010	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST site created in CSP database for source area gasoline tank system, 78438	Robert Weimer
8/25/2011	Meeting or Teleconference Held	Meeting with Shell and CRA to discuss proposed site investigation work plan. The plan proposes to install two additional monitoring wells and sample 3 other soil borings to assess current soil contamination concentrations in those areas. The hope is that the sampling will demonstrate that the site has remediated to site cleanup levels. CRA is to provide a revised work plan to include additional soil boring locations. DEC also requested missing groundwater monitoring reports.	Robert Weimer
8/25/2011	Site Visit	Site visit to observe current site conditions.	Robert Weimer
10/7/2011	Site Characterization Workplan Approved	DEC approves work plan for the collection of soil and groundwater samples from 6 soil boring of which 1 or 2 will be completed as long term monitoring wells. The samples will help to assess the current levels of contamination at the site.	Robert Weimer
9/19/2012	Document, Report, or Work plan Review - other	November 8, 2011 groundwater monitoring event. One monitoring well was sampled (MW-5) it was non-detect (<1.0 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<755 ug/l) DRO, and non-detect (<975 ug/l) RRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 22 feet below ground surface.	Robert Weimer
10/30/2012	Offsite Soil or Groundwater Disposal Approved	DEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water.	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 within the top foot of the water column, 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
3/27/2013	Document, Report, or Work plan Review - other	March 30, 2012 groundwater monitoring event. One monitoring well was sampled (MW-5) it was non-detect (<1.0 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<769 ug/l) DRO, and non-detect (<952 ug/l) RRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 22 feet below ground surface. Monitoring well was purged before sampling with low flow in well pump.	Robert Weimer
5/8/2013	Update or Other Action	DEC confirmed that since the previous groundwater samples were collected after purging, that the DEC is not requesting a purge/no purge comparison sampling event for this site.	Robert Weimer
5/17/2013	Document, Report, or Work plan Review - other	October 29, 2012 groundwater monitoring event. One monitoring well was sampled (MW-5) it was non-detect (<1.0 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<762 ug/l) DRO, and non-detect (<952 ug/l) RRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21 feet below ground surface. Monitoring well was purged before sampling with low flow in well pump.	Robert Weimer
6/28/2013	Site Visit	Site visit to observe current site conditions.	Robert Weimer
8/29/2013	Document, Report, or Work plan Review - other	June 13, 2012 groundwater monitoring event. One monitoring well was sampled (MW-5) it was non-detect (<1.0 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<769 ug/l) DRO, and non-detect (<952 ug/l) RRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21 feet below ground surface. Monitoring well was purged before sampling with low flow in well pump.	Robert Weimer
9/2/2013	Site Characterization Report Approved	On October 2011 four soil borings were sampled and one monitoring well (MW-5) was installed and sampled. The sampling was conducted to help assess the current concentrations of contaminants in some of the areas of the site that had previously shown contamination over site cleanup levels. In the areas sampled there was up to non-detect (<23.7 mg/kg) GRO, non-detect (<20.7 mg/kg) DRO, non-detect (<101 mg/kg) RRO, 5.99 mg/kg arsenic, 35.7 mg/kg chromium, and 0.00448 mg/kg benzene in the soil. In the groundwater (MW-5) had non-detect (<0.1 mg/l) GRO, non-detect (<0.755 mg/l) DRO, non-detect (<0.971 mg/l) RRO, and non-detect (<1.0 ug/l) benzene. Depth to groundwater was 22.05 feet below ground surface. Two of the areas planned to be sampled (TI-29) and (TI-4/MW-4) were not sampled because of nearby active fuel line and nearby utilites.	Robert Weimer
9/3/2013	Site Characterization Workplan Approved	The July 2, 2013 work plan is approved under the following conditions: 1. No vac truck or air-knife within 4 feet horizontally or vertically of a sample location. 2. Where the soil samples are to be collected they 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. If the highest field reading depth is a different depth than proposed sampling depth then an additional sample needs to be collected at the highest field screening depth. 4. Need to report the full results of the 8260B analysis not just the BTEX and PCE proposed. The work plan proposes to collect soil samples at two locations at waste oil WO-2 and and dispenser/piping location TI-29. As have been discussed in the past, there are two other areas at the site that had identified contamination over cleanup levels that have not had confirmation samples collected and will need further assessment in the future: T1-4/MW-4 (former buried drum area) and T1-3 (former UST excavation). We can discuss in the future how best to address those areas. Based on the results of site sampling additional assessment, monitoring, and or corrective action may be required.	Robert Weimer
10/10/2013	Document, Report, or Work plan Review - other	August 17, 2012 groundwater monitoring event. One monitoring well was sampled (MW-5) it had non-detect (<100 ug/l) GRO, non-detect (<800 ug/l) DRO, and non-detect (<1,000 ug/l) RRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21 feet below ground surface. The monitoring well was purged before sampling with low flow in well pump.	Robert Weimer
10/22/2013	Update or Other Action	Approved reduction in groundwater sampling in monitoring well MW-5 from quarterly to annual.	Robert Weimer
12/12/2013	Document, Report, or Work plan Review - other	March 29, 2013 groundwater monitoring event. One monitoring well was sampled (MW-5) it had non-detect (<1 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<777 ug/l) DRO, non-detect (<1,010 ug/l) RRO, non-detect (<2 ug/l) arsenic, and non-detect (<2 ug/l) chromium in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21.45 feet below ground surface. The monitoring well was purged before sampling with a bladder pump.	Robert Weimer
3/5/2014	Document, Report, or Work plan Review - other	June 14, 2013 groundwater monitoring event. One monitoring well was sampled (MW-5) it was non-detect (<1 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<800 ug/l) DRO, non-detect (<1,000 ug/l) RRO, non-detect (<2 ug/l) arsenic, and non-detect (<2 ug/l) chromium in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 22.07 feet below ground surface. The monitoring well was purged before sampling with a bladder pump, but the results may be biased low because the sample interval was not documented in the report or in the field notes.	Robert Weimer
3/10/2014	Document, Report, or Work plan Review - other	August 5, 2013 groundwater monitoring event. One monitoring well was sampled (MW-5) it had non-detect (<1 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<762 ug/l) DRO, non-detect (<943 ug/l) RRO, 11.5 ug/l arsenic, and 35.4 ug/l chromium in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21.11 feet below ground surface. The monitoring well was purged before sampling with a bladder pump, but the results may be biased low because the sample interval was not documented in the report or in the field notes.	Robert Weimer
5/27/2014	Document, Report, or Work plan Review - other	On September 2013 two soil borings SB-A (near TI-29 at 6.5 feet below ground surface) and SB-B (near WO-2 at 7 feet below ground surface) were sampled. The borings were hand cleared within 4 feet of volatile samples. The samples were analyzed only for VOCs (full method 8260). Only 0.0207 mg/kg toluene was detected in the samples collected. This information was summarized in the May 2014 conceptual site model report. Still need copy of the full report for the September 2013 sampling.	Robert Weimer
5/27/2014	Conceptual Site Model Submitted	Updated conceptual site model submitted.	Robert Weimer
8/8/2014	Offsite Soil or Groundwater Disposal Approved	ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water.	Robert Weimer
9/25/2014	Offsite Soil or Groundwater Disposal Approved	ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water.	Robert Weimer
4/23/2015	Document, Report, or Work plan Review - other	June 16, 2014 groundwater monitoring event. One monitoring well was sampled (MW-5) that had non-detect (<1 ug/l) benzene, 286 ug/l DRO, 79.5 ug/l RRO, non-detect (<100 ug/l) GRO, non-detect (<2.0 ug/l) arsenic, and 0.532 ug/l chromium in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 20.94 feet below ground surface. The monitoring well was purged before sampling with a bladder pump and the intake of the pump was 0.56 feet below the groundwater surface.	Robert Weimer
1/25/2016	Document, Report, or Work plan Review - other	September 11, 2015 groundwater monitoring event. One monitoring well was sampled (MW-5) that had non-detect (<1 ug/l) benzene (5 ug/l cleanup level), 0.142 mg/l DRO (1.5 mg/l cleanup level, 0.0943 mg/l RRO (1.1 mg/l cleanup level), non-detect (<0.1 mg/l) GRO (2.2 mg/l cleanup level), non-detect (<2.67 ug/l) chromium (100 ug/l cleanup level), and 0.598 ug/l arsenic (10 ug/l cleanup level) in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21.62 feet below ground surface. The monitoring well was purged before sampling with a bladder pump and the intake of the pump was 0.45 feet below the groundwater surface. An additional monitoring well at the former drum are (TI-4) has been requested to assess the concentrations of groundwater contamination in that area of the site.	Robert Weimer
3/18/2016	Update or Other Action	File review and provide the following information to the RPs (Shell Oil) consultant (GHD). Need further site characterization to consider it for closure: 1. Drum area (Boring TI-4), soil samples collected at the highest field screening depth shallower than 21ft, and the soil water interface analyzed for BTEX/GRO/DRO/RRO/PAH/VOC/Total Arsenic/Total Chromium. This boring needs to be completed as a long-term monitoring well, with quarterly groundwater samples collected for BTEX/GRO/DRO/RRO/PAH/VOC for a minimum of 1 year. 2. Gasoline tank (TI-3) soil samples collected at 20ft and soil/water interface analyzed for BTEX/GRO/Naphthalene. 3. Dispenser/piping location (TI-29) soil samples collected at 6.5ft and soil/water interface analyzed for BTEX/GRO/ Naphthalene.	Robert Weimer
4/14/2016	Update or Other Action	DEC requests from Shells consultant (GHD) a copy of the site investigation report for the sampling conducted on September 2013.	Robert Weimer
4/18/2017	Update or Other Action	DEC requested work plan to complete site characterization at the dispenser, tank, and buried drum area.	Robert Weimer
4/19/2017	Update or Other Action	Email from Shell's consultant GHD, they have not been able to locate the site investigation report for the sampling conducted on September 2013. They said they will continue to look for the report.	Robert Weimer
2/5/2018	Update or Other Action	DEC again requests from Shells consultant (GHD) a copy of the site investigation report for the sampling conducted on September 2013.	Robert Weimer
4/12/2019	Update or Other Action	DEC talked with Shells consultant and it appears that the 2013 report was never completed by the previous consultant and that the 2013 samples were not properly preserved in the field. They will submit a work plan to conduct the assessment of areas of TI-4 (former drum area), TI-3 (former UST excavation), and TI-29 (southern dispenser). This would include a monitoring well and a minimum of 4 quarterly groundwater event at the drum area.	Robert Weimer
8/26/2019	Update or Other Action	DEC contacted Shells consultant for an update on the requested work plan and site work.	Robert Weimer
3/30/2021	Site Characterization Workplan Approved	The ADEC approved a site characterization work plan submitted by Shell, and prepared by AECOM on February 24, 2021.	Randy Guintu
7/29/2021	Offsite Soil or Groundwater Disposal Approved	Approval for investigative derived waste consisting of soil borings and purge water approved to be disposed of via US Ecology.	Kara Kusche
12/16/2021	Offsite Soil or Groundwater Disposal Approved	Approval for 55 gallons of investigative derived purge water to be disposed of via US Ecology.	Flannery Ballard
4/7/2022	Document, Report, or Work plan Review - other	The ADEC provided comments in response to "Site Investigation Draft Report", and requested the report should be revised and re-submitted for approval.	Flannery Ballard
9/6/2022	Site Characterization Workplan Approved	ADEC Approval Letter sent to Shell and consultant (AECOM) for Modification to Work Plan for additional site characterization.	Alena Voigt
12/16/2022	Document, Report, or Work plan Review - other	The ADEC provided additional comments in response to "Site Investigation Draft Report", and requested the report should be revised and re-submitted for approval.	Alena Voigt
1/4/2023	Site Characterization Report Approved	The revised “Site Investigation Final Report” was received on December 28, 2022. The revised final report is approved.	Alena Voigt
9/18/2023	Update or Other Action	The Alaska Department of Environmental Conservation’s (ADEC) Contaminated Sites Program (CSP) reviewed the “Groundwater Monitoring Work Plan”, dated September 12, 2023, from AECOM Technical Services, Inc. (AECOM). The ADEC provided comments to the responsible party and environmental consultant that should be addressed and re-submitted.	Alena Voigt
10/12/2023	Site Characterization Workplan Approved	The ADEC CSP reviewed the “Groundwater Monitoring Work Plan”, dated September 13, 2023, received from AECOM Technical Services, Inc. The CSP provided comments on September 18, 2023, and a revised work plan, dated September 19, 2023, was received on October 4, 2023. The work plan details include a land survey to confirm groundwater flow direction and gradient, an environmental database report (EDR), collecting groundwater monitoring samples, and preparing a letter report.	Alena Voigt

Action Date

Action

Description

DEC Staff

8/2/1989

Site Visit

Site visit during tank removal noted visual and olfactory evidence of petroleum contaminated soil.

Ron Godden

8/2/1990

Underground Storage Tank Site Characterization or Assessment

Site assessment report for upgrade of gasoline UST system.

Former Staff

8/2/1990

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 78437 Gasoline contamination.

Former Staff

8/2/1990

Site Added to Database

Former Staff

8/3/1990

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

LCAU Date changed DB conversion.

Former Staff

8/10/1990

Update or Other Action

ADEC letter to Texaco requesting workplans for release investigation and corrective action for the remaining contamination at the site.

John Halverson

9/17/1990

Update or Other Action

ENSR to have AK Pollution Control remove, treat, then dispose of the contaminated soils at the Anchorage Municipality landfill. ADEC approval sent on 09/21/90.

John Halverson

9/21/1990

Update or Other Action

ADEC approves transport and treatment of used oil contaminated soil.

John Halverson

10/2/1990

Update or Other Action

ADEC approves thermal treatment of gasoline contaminated soil from the site.

John Halverson

11/8/1990

Document, Report, or Work plan Review - other

ENSR Environmental assessment report for site: total petroleum hydrocarbon levels in fuel oil excavation were from 28 to 113 mg/kg, in area found to contain buried drums were 27 to 973 mg/kg. Groundwater samples collected from the 3 monitoring wells were non detectable for BETX .

Former Staff

12/11/1990

Update or Other Action

ADEC letter sent out requesting plans for additional assessment and or cleanup by 1-25-91. ENSR documents from disposal of waste oil contaminated soil disposal at landfill after treatment at the AK Pollution Control facility in Palmer received by ADEC on 4/12/91. The letter also noted QA/QC problems with some of the samples collected.

John Halverson

12/14/1990

Document, Report, or Work plan Review - other

12/14/90 groundwater monitoring event. The three site monitoring wells sampled were all non-detect (<1.0 ug/l) benzene in the groundwater. Corrected groundwater flow direction is to the southwest.

Robert Weimer

2/20/1991

Update or Other Action

ADEC letter sent to Texaco conditionally approving plan (received on 2/20/91). The results of additional testing & assessment work be sent for review & approval along with final plans for the design, installation & operation of the remediation systems.

Former Staff

2/22/1991

Document, Report, or Work plan Review - other

2/22/91 groundwater monitoring event. The three monitoring wells were sampled were all non-detect (<1.0 ug/l) benzene in the groundwater. Groundwater flowed to the southwest.

Robert Weimer

3/8/1991

Document, Report, or Work plan Review - other

Texaco's consultant provides documentation of the disposal at the MOA landfill of soil treated at APC.

Robert Weimer

4/19/1991

Update or Other Action

ADEC letter approving corrective action plan. The plan calls for using a vapor extraction system (VES) to treat the remaining soil contamination at the tanks and disenser islands. VES piping was installed beneath the new tanks and dispensers.

John Halverson

4/26/1991

Document, Report, or Work plan Review - other

A fourth monitoring well (TI-4) was installed on 4/26/91. This monitoring well was installed on the east side of the former buried drum exavation (located on the northeast corner of the property). Soil samples collected during the installation of the monitoring well had up to 2,690 mg/kg DRO, and non-detect (<0.02 mg/kg) benzene. Contamination over cleanup levels was found from 2.5 to 9.5 feet below ground surface (bgs) and 15 to 24.5 feet bgs. Groundwater was encountered at 23 feet bgs. The extent of the contamination has not been defined.

Robert Weimer

5/22/1991

Document, Report, or Work plan Review - other

5/22/91 groundwater monitoring event. Four monitoring wells were sampled, they were all non-detect (<1.0 ug/l) for benzene in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.58 to 22.48 feet below ground surface.

Robert Weimer

11/8/1991

Document, Report, or Work plan Review - other

11/8/91 groundwater monitoring event. Four monitoring wells were sampled, they were all non-detect (<1.0 ug/l) for benzene in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.78 to 22.30 feet below ground surface.

Robert Weimer

10/20/1992

Document, Report, or Work plan Review - other

10/20/92 groundwater monitoring event. Four monitoring wells were sampled. Up to 34 ug/l benzene and 0.077 mg/l GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.5 to 22.27 feet below ground surface.

Robert Weimer

1/19/1993

Document, Report, or Work plan Review - other

1/19/93 groundwater monitoring event. Four monitoring wells were sampled. Up to 0.6 ug/l benzene and 0.044 mg/l GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.49 to 22.25 feet below ground surface.

Robert Weimer

4/27/1993

Document, Report, or Work plan Review - other

4/27/93 groundwater monitoring event. Four monitoring wells were sampled. Up to 1 ug/l benzene and 0.05 mg/l GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.28 to 22.11 feet below ground surface.

Robert Weimer

7/8/1993

Document, Report, or Work plan Review - other

7/8/93 groundwater monitoring event. Four monitoring wells were sampled. Up to 0.4 ug/l benzene and non-detect (<0.01 mg/l) GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.23 to 21.73 feet below ground surface.

Robert Weimer

8/26/1993

Document, Report, or Work plan Review - other

The soil vapor extraction system (VES) began operation on August 26, 1993. Between 8/23/93 and 1/6/94 the VES system removed 513 pounds of gasoline. The VES is hooked up to piping at both pump islands, the northern portion of the tank area, and monitoring well T1-4 located at the former buried drum area.

Robert Weimer

10/29/1993

Document, Report, or Work plan Review - other

10/29/93 groundwater monitoring event. Four monitoring wells were sampled, they were all non-detect (<0.3 ug/l) for benzene and non-detect (<0.01 mg/l) for GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.21 to 21.63 feet below ground surface.

Robert Weimer

4/6/1994

Document, Report, or Work plan Review - other

4/6/94 groundwater monitoring event. Two monitoring wells were sampled (two others were covered with snow). They were both non-detect (<1 ug/l) for benzene and non-detect (<0.05 mg/l) for GRO in the groundwater. Groundwater historically has flowed to the southwest. Depth to groundwater was 21.85 to 21.91 feet below ground surface.

Robert Weimer

7/16/1994

Document, Report, or Work plan Review - other

7/16/94 groundwater monitoring event. Four monitoring wells were sampled, they were all non-detect (<0.5 ug/l) benzene and non-detect (<0.05 mg/l) GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.71 to 22.28 feet below ground surface.

Robert Weimer

12/13/1994

Document, Report, or Work plan Review - other

12/36/94 groundwater monitoring event. Four monitoring wells were sampled, they were all non-detect (<0.5 ug/l) benzene and non-detect (<0.05 mg/l) GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 22.09 to 22.75 feet below ground surface.

Robert Weimer

2/10/1995

Update or Other Action

ADEC letter approving suspending GRO analysis in all monitoring wells, and BTEX in monitoring wells T1-1 and T1-3. ADEC requests that all monitoring wells be sampled for TPH and monitoring well T1-4 for DRO and TPH. ADEC also requests VES system reports be submitted on a quarterly basis.

Robert Weimer

4/5/1995

Document, Report, or Work plan Review - other

4/5/95 groundwater monitoring event. Three monitoring wells were sampled (monitoring well T1-4 was not sampled due to snow). They were non-detect (<0.5 ug/l) for benzene and non-detect (<0.05 mg/l) for GRO in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 22.21 to 22.80 feet below ground surface.

Robert Weimer

6/19/1995

Document, Report, or Work plan Review - other

6/19/95 groundwater monitoring event. Four monitoring wells were sampled. Up to non-detect (<0.5 ug/l) benzene, 0.5 mg/l DRO, and non-detect (<0.25 mg/l) TPH in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 21.6 to 22.21 feet below ground surface.

Robert Weimer

9/19/1995

Document, Report, or Work plan Review - other

9/19/95 groundwater monitoring event. Four monitoring wells were sampled. Up to non-detect (<0.5 ug/l) benzene, 1.3 mg/l DRO, and 1.6 mg/l TPH in the groundwater. Groundwater flowed to the southwest. Depth to groundwater was 22.0 to 24.58 feet below ground surface. The dilution valve has been open on the VES system since 5/25/95.

Robert Weimer

11/26/1996

Update or Other Action

ADEC letter requests that monitoring wells T1-3 and T1-4 be sampled for DRO. ADEC also requests a confirmation soil sampling plan for the areas previously identified as having soil contamination over cleanup levels. The letter notes that the 9/23/96 sampling of the former drum area was not adequatelty assessed, it was dug in the wrong location and was only sampled at 3.5 to 4 feet below ground surface. The letter also noted that the site assessment for used oil tank that was removed on 9/19/96 was not complete.

Robert Weimer

1/23/1997

Document, Report, or Work plan Review - other

Summary report for the removal of a 500 gallon used oil tank, 2 floor hoists, a sand trap, and a test pit near the former buried drum area on 9/23/96. The assessment of the buried drum area appears to be in the wrong location and to be too shallow (only 3.5 to 4 feet below ground surface-the previous excavation showed contamination also at the base at 8 feet bgs). Up to non-detect (<0.05 mg/kg) benzene, non-detect (<5 mg/kg) GRO, and 61.6 mg/kg at the sand trap excavation. Up to non-detect (<0.05 mg/kg) benzene, non-detect (<5 mg/kg) GRO, and 11.5 DRO mg/kg DRO at the floor hoists. Up to non-detect (<0.05 mg/kg) benzene, non-detect (<5 mg/kg) GRO, and 5.22 mg/kg DRO at the samples collected near the former buried drums, but the buried drum assessment was not complete and further assessment is required. Up to non-detect (<0.05 mg/kg) benzene, non-detect (<5 mg/kg) GRO, and 7.07 mg/kg DRO at the samples collected in the used oil tank excavation.

Robert Weimer

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 requests a workplan for assessment at the drum area, a workplan for confirmation soil samples, and monitoring well sampling.

Robert Weimer

8/9/2001

Document, Report, or Work plan Review - other

8/9/01 groundwater monitoring event. One monitoring well was sampled (T1-3). Up to 0.144 mg/l DRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21.92 to 22.16 feet below ground surface.

Robert Weimer

8/31/2004

Update or Other Action

Soil contamination remains at former buried drum area and former/current UST gasoline system. There is also 0.05 mg/kg benzene on the excavation north wall of the former fuel oil tank (located on the north side of the building near the west corner).

Robert Weimer

10/24/2005

Update or Other Action

Need soil confirmation samples to assess that remains at former buried drum area and former/current UST gasoline system. Also at the north sidewall of the former fuel oil tank (located on the north side of the building).

Robert Weimer

3/1/2007

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. (Gasoline tanks and drum areas)

Robert Weimer

10/24/2008

Document, Report, or Work plan Review - other

Review of Phase II Report dated February 28, 2008 for the 901 East 15th Avenue property. The report documents the sampling of 6 soil borings and the collection of one groundwater sample at the site on January 21, 2008. While the sampling found no detectable petroleum contamination at the locations and depths sampled, the soil benzene detection limits (0.05 mg/kg and 0.06 mg/kg) did not meet our laboratory requirements so we it does not demonstrate that the benzene contamination remaining is below site cleanup levels (0.025 mg/kg). In addition the areas sampled were not close enough to assess the areas previously identified as having contamination above site cleanup levels. Additional confirmation sampling will be required the evaluate this site for closure.

Robert Weimer

12/2/2008

Update or Other Action

File review to determine where confirmation sampling is needed for site closure. At minimum need: 1. Gasoline tank (TI-3) 20ft and soil/water interface for BTEX/GRO. 2. South dispenser island (TI-32) 6ft for BTEX/GRO. 3. South dispenser island (boring TI-B1) 21ft, soil/water interface, and the highest field screening depth shallower than 21ft all for BTEX/GRO. This boring to be completed as a monitoring well with a water sample collected for BTEX/GRO. 4. Fuel oil tank (TI-20) highest field screening within 8 feet for BTEX. 5. Drum area (TI-34) 8ft for BTEX/GRO/DRO/RRO/Total Arsenic/Total Chromium. 6. Drum area (TI-38) 4ft for BTEX/GRO/DRO/RRO/Total Arsenic/Total Chromium. 7. Drum area (Boring TI-4) 21, the highest field screening depth shallower than 21ft, and the soil water interface for BTEX/GRO/DRO/RRO/Total Arsenic/Total Chromium. This boring needs to be completed as a monitoring well, with a groundwater sample collected for BTEX/GRO/DRO/RRO. Monitoring wells need to be completed so that additional future groundwater monitoring events can be conducted if necessary.

Robert Weimer

2/12/2009

Update or Other Action

Discussed with Texaco's consultant that they need to do further assessment and groundwater monitoring at the site.

Robert Weimer

4/1/2009

Meeting or Teleconference Held

Discussed with Texaco's consultant (Delta) that they are stilling waiting direction from Texaco as to which consultant will take the lead on this site.

Robert Weimer

4/22/2010

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST site created in CSP database for source area gasoline tank system, 78438

Robert Weimer

8/25/2011

Meeting or Teleconference Held

Meeting with Shell and CRA to discuss proposed site investigation work plan. The plan proposes to install two additional monitoring wells and sample 3 other soil borings to assess current soil contamination concentrations in those areas. The hope is that the sampling will demonstrate that the site has remediated to site cleanup levels. CRA is to provide a revised work plan to include additional soil boring locations. DEC also requested missing groundwater monitoring reports.

Robert Weimer

8/25/2011

Site Visit

Site visit to observe current site conditions.

Robert Weimer

10/7/2011

Site Characterization Workplan Approved

DEC approves work plan for the collection of soil and groundwater samples from 6 soil boring of which 1 or 2 will be completed as long term monitoring wells. The samples will help to assess the current levels of contamination at the site.

Robert Weimer

9/19/2012

Document, Report, or Work plan Review - other

November 8, 2011 groundwater monitoring event. One monitoring well was sampled (MW-5) it was non-detect (<1.0 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<755 ug/l) DRO, and non-detect (<975 ug/l) RRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 22 feet below ground surface.

Robert Weimer

10/30/2012

Offsite Soil or Groundwater Disposal Approved

DEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water.

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 within the top foot of the water column, 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

3/27/2013

Document, Report, or Work plan Review - other

March 30, 2012 groundwater monitoring event. One monitoring well was sampled (MW-5) it was non-detect (<1.0 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<769 ug/l) DRO, and non-detect (<952 ug/l) RRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 22 feet below ground surface. Monitoring well was purged before sampling with low flow in well pump.

Robert Weimer

5/8/2013

Update or Other Action

DEC confirmed that since the previous groundwater samples were collected after purging, that the DEC is not requesting a purge/no purge comparison sampling event for this site.

Robert Weimer

5/17/2013

Document, Report, or Work plan Review - other

October 29, 2012 groundwater monitoring event. One monitoring well was sampled (MW-5) it was non-detect (<1.0 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<762 ug/l) DRO, and non-detect (<952 ug/l) RRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21 feet below ground surface. Monitoring well was purged before sampling with low flow in well pump.

Robert Weimer

6/28/2013

Site Visit

Site visit to observe current site conditions.

Robert Weimer

8/29/2013

Document, Report, or Work plan Review - other

June 13, 2012 groundwater monitoring event. One monitoring well was sampled (MW-5) it was non-detect (<1.0 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<769 ug/l) DRO, and non-detect (<952 ug/l) RRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21 feet below ground surface. Monitoring well was purged before sampling with low flow in well pump.

Robert Weimer

9/2/2013

Site Characterization Report Approved

On October 2011 four soil borings were sampled and one monitoring well (MW-5) was installed and sampled. The sampling was conducted to help assess the current concentrations of contaminants in some of the areas of the site that had previously shown contamination over site cleanup levels. In the areas sampled there was up to non-detect (<23.7 mg/kg) GRO, non-detect (<20.7 mg/kg) DRO, non-detect (<101 mg/kg) RRO, 5.99 mg/kg arsenic, 35.7 mg/kg chromium, and 0.00448 mg/kg benzene in the soil. In the groundwater (MW-5) had non-detect (<0.1 mg/l) GRO, non-detect (<0.755 mg/l) DRO, non-detect (<0.971 mg/l) RRO, and non-detect (<1.0 ug/l) benzene. Depth to groundwater was 22.05 feet below ground surface. Two of the areas planned to be sampled (TI-29) and (TI-4/MW-4) were not sampled because of nearby active fuel line and nearby utilites.

Robert Weimer

9/3/2013

Site Characterization Workplan Approved

The July 2, 2013 work plan is approved under the following conditions: 1. No vac truck or air-knife within 4 feet horizontally or vertically of a sample location. 2. Where the soil samples are to be collected they 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. If the highest field reading depth is a different depth than proposed sampling depth then an additional sample needs to be collected at the highest field screening depth. 4. Need to report the full results of the 8260B analysis not just the BTEX and PCE proposed. The work plan proposes to collect soil samples at two locations at waste oil WO-2 and and dispenser/piping location TI-29. As have been discussed in the past, there are two other areas at the site that had identified contamination over cleanup levels that have not had confirmation samples collected and will need further assessment in the future: T1-4/MW-4 (former buried drum area) and T1-3 (former UST excavation). We can discuss in the future how best to address those areas. Based on the results of site sampling additional assessment, monitoring, and or corrective action may be required.

Robert Weimer

10/10/2013

Document, Report, or Work plan Review - other

August 17, 2012 groundwater monitoring event. One monitoring well was sampled (MW-5) it had non-detect (<100 ug/l) GRO, non-detect (<800 ug/l) DRO, and non-detect (<1,000 ug/l) RRO in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21 feet below ground surface. The monitoring well was purged before sampling with low flow in well pump.

Robert Weimer

10/22/2013

Update or Other Action

Approved reduction in groundwater sampling in monitoring well MW-5 from quarterly to annual.

Robert Weimer

12/12/2013

Document, Report, or Work plan Review - other

March 29, 2013 groundwater monitoring event. One monitoring well was sampled (MW-5) it had non-detect (<1 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<777 ug/l) DRO, non-detect (<1,010 ug/l) RRO, non-detect (<2 ug/l) arsenic, and non-detect (<2 ug/l) chromium in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21.45 feet below ground surface. The monitoring well was purged before sampling with a bladder pump.

Robert Weimer

3/5/2014

Document, Report, or Work plan Review - other

June 14, 2013 groundwater monitoring event. One monitoring well was sampled (MW-5) it was non-detect (<1 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<800 ug/l) DRO, non-detect (<1,000 ug/l) RRO, non-detect (<2 ug/l) arsenic, and non-detect (<2 ug/l) chromium in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 22.07 feet below ground surface. The monitoring well was purged before sampling with a bladder pump, but the results may be biased low because the sample interval was not documented in the report or in the field notes.

Robert Weimer

3/10/2014

Document, Report, or Work plan Review - other

August 5, 2013 groundwater monitoring event. One monitoring well was sampled (MW-5) it had non-detect (<1 ug/l) benzene, non-detect (<100 ug/l) GRO, non-detect (<762 ug/l) DRO, non-detect (<943 ug/l) RRO, 11.5 ug/l arsenic, and 35.4 ug/l chromium in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21.11 feet below ground surface. The monitoring well was purged before sampling with a bladder pump, but the results may be biased low because the sample interval was not documented in the report or in the field notes.

Robert Weimer

5/27/2014

Document, Report, or Work plan Review - other

On September 2013 two soil borings SB-A (near TI-29 at 6.5 feet below ground surface) and SB-B (near WO-2 at 7 feet below ground surface) were sampled. The borings were hand cleared within 4 feet of volatile samples. The samples were analyzed only for VOCs (full method 8260). Only 0.0207 mg/kg toluene was detected in the samples collected. This information was summarized in the May 2014 conceptual site model report. Still need copy of the full report for the September 2013 sampling.

Robert Weimer

5/27/2014

Conceptual Site Model Submitted

Updated conceptual site model submitted.

Robert Weimer

8/8/2014

Offsite Soil or Groundwater Disposal Approved

ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water.

Robert Weimer

9/25/2014

Offsite Soil or Groundwater Disposal Approved

ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water.

Robert Weimer

4/23/2015

Document, Report, or Work plan Review - other

June 16, 2014 groundwater monitoring event. One monitoring well was sampled (MW-5) that had non-detect (<1 ug/l) benzene, 286 ug/l DRO, 79.5 ug/l RRO, non-detect (<100 ug/l) GRO, non-detect (<2.0 ug/l) arsenic, and 0.532 ug/l chromium in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 20.94 feet below ground surface. The monitoring well was purged before sampling with a bladder pump and the intake of the pump was 0.56 feet below the groundwater surface.

Robert Weimer

1/25/2016

Document, Report, or Work plan Review - other

September 11, 2015 groundwater monitoring event. One monitoring well was sampled (MW-5) that had non-detect (<1 ug/l) benzene (5 ug/l cleanup level), 0.142 mg/l DRO (1.5 mg/l cleanup level, 0.0943 mg/l RRO (1.1 mg/l cleanup level), non-detect (<0.1 mg/l) GRO (2.2 mg/l cleanup level), non-detect (<2.67 ug/l) chromium (100 ug/l cleanup level), and 0.598 ug/l arsenic (10 ug/l cleanup level) in the groundwater. Groundwater historically flows to the southwest. Depth to groundwater was 21.62 feet below ground surface. The monitoring well was purged before sampling with a bladder pump and the intake of the pump was 0.45 feet below the groundwater surface. An additional monitoring well at the former drum are (TI-4) has been requested to assess the concentrations of groundwater contamination in that area of the site.

Robert Weimer

3/18/2016

Update or Other Action

File review and provide the following information to the RPs (Shell Oil) consultant (GHD). Need further site characterization to consider it for closure: 1. Drum area (Boring TI-4), soil samples collected at the highest field screening depth shallower than 21ft, and the soil water interface analyzed for BTEX/GRO/DRO/RRO/PAH/VOC/Total Arsenic/Total Chromium. This boring needs to be completed as a long-term monitoring well, with quarterly groundwater samples collected for BTEX/GRO/DRO/RRO/PAH/VOC for a minimum of 1 year. 2. Gasoline tank (TI-3) soil samples collected at 20ft and soil/water interface analyzed for BTEX/GRO/Naphthalene. 3. Dispenser/piping location (TI-29) soil samples collected at 6.5ft and soil/water interface analyzed for BTEX/GRO/ Naphthalene.

Robert Weimer

4/14/2016

Update or Other Action

DEC requests from Shells consultant (GHD) a copy of the site investigation report for the sampling conducted on September 2013.

Robert Weimer

4/18/2017

Update or Other Action

DEC requested work plan to complete site characterization at the dispenser, tank, and buried drum area.

Robert Weimer

4/19/2017

Update or Other Action

Email from Shell's consultant GHD, they have not been able to locate the site investigation report for the sampling conducted on September 2013. They said they will continue to look for the report.

Robert Weimer

2/5/2018

Update or Other Action

DEC again requests from Shells consultant (GHD) a copy of the site investigation report for the sampling conducted on September 2013.

Robert Weimer

4/12/2019

Update or Other Action

DEC talked with Shells consultant and it appears that the 2013 report was never completed by the previous consultant and that the 2013 samples were not properly preserved in the field. They will submit a work plan to conduct the assessment of areas of TI-4 (former drum area), TI-3 (former UST excavation), and TI-29 (southern dispenser). This would include a monitoring well and a minimum of 4 quarterly groundwater event at the drum area.

Robert Weimer

8/26/2019

Update or Other Action

DEC contacted Shells consultant for an update on the requested work plan and site work.

Robert Weimer

3/30/2021

Site Characterization Workplan Approved

The ADEC approved a site characterization work plan submitted by Shell, and prepared by AECOM on February 24, 2021.

Randy Guintu

7/29/2021

Offsite Soil or Groundwater Disposal Approved

Approval for investigative derived waste consisting of soil borings and purge water approved to be disposed of via US Ecology.

Kara Kusche

12/16/2021

Offsite Soil or Groundwater Disposal Approved

Approval for 55 gallons of investigative derived purge water to be disposed of via US Ecology.

Flannery Ballard

4/7/2022

Document, Report, or Work plan Review - other

The ADEC provided comments in response to "Site Investigation Draft Report", and requested the report should be revised and re-submitted for approval.

Flannery Ballard

9/6/2022

Site Characterization Workplan Approved

ADEC Approval Letter sent to Shell and consultant (AECOM) for Modification to Work Plan for additional site characterization.

Alena Voigt

12/16/2022

Document, Report, or Work plan Review - other

The ADEC provided additional comments in response to "Site Investigation Draft Report", and requested the report should be revised and re-submitted for approval.

Alena Voigt

1/4/2023

Site Characterization Report Approved

The revised “Site Investigation Final Report” was received on December 28, 2022. The revised final report is approved.

Alena Voigt

9/18/2023

Update or Other Action

The Alaska Department of Environmental Conservation’s (ADEC) Contaminated Sites Program (CSP) reviewed the “Groundwater Monitoring Work Plan”, dated September 12, 2023, from AECOM Technical Services, Inc. (AECOM). The ADEC provided comments to the responsible party and environmental consultant that should be addressed and re-submitted.

Alena Voigt

10/12/2023

Site Characterization Workplan Approved

The ADEC CSP reviewed the “Groundwater Monitoring Work Plan”, dated September 13, 2023, received from AECOM Technical Services, Inc. The CSP provided comments on September 18, 2023, and a revised work plan, dated September 19, 2023, was received on October 4, 2023. The work plan details include a land survey to confirm groundwater flow direction and gradient, an environmental database report (EDR), collecting groundwater monitoring samples, and preparing a letter report.

Alena Voigt

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Hazard ID	Site Name	File Number
26240	Fairview Areawide Brownfield Assessment	2100.57.020

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26240

Fairview Areawide Brownfield Assessment

2100.57.020

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Site Report: Texaco #90 901 East 15th

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State of Alaska Department of Environmental Conservation