Site Report: Tesoro #1 Port of Anchorage

Site Name:	Tesoro #1 Port of Anchorage
Address:	1522 Anchorage Port Road, Port of Anchorage, Anchorage, AK 99501
File Number:	2100.38.311
Hazard ID:	600
Status:	Active
Staff:	Michael Hooper, 9074515174 michael.hooper@alaska.gov
Latitude:	61.234200
Longitude:	-149.889800
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

Numerous releases of gasoline and diesel documented at this tank farm adjacent to the Cook Inlet shoreline. Free product is probably present in some areas beneath the tank farm liner. Diesel fuel leak in pipeline on 5/18/89 contaminated surface soils. Historic spillage at the site has entered sewerline adjacent to bulk plant. Quantities and extent of contamination significant. Potential health concern for workers. Contaminated soils excavated and long term remediation facilities installed in 1990. Based on petroleum hydrocarbons entering a sewerline adjacent to the Tesoro bulk plant, additional site investigation focusing on the Truck Loading Rack (TLR) area was undertaken by Tesoro. Subsurface soil and groundwater contamination occurred at the diesel leak and TLR. Site investigation at the TLR area detected benzene at 1,400 ppm. Groundwater is at about 5 feet below the surface. Product recovery wells installed to recover product. Last staff assigned were Frechione and Olson. Administrative order on consent (US EPA Docket No. CERCLA 10-2004-0065) signed on 6/29/04 to include ARRC terminal and Area 3, and other designed leased properties.

Action Information

Action Date	Action	Description	DEC Staff
5/18/1989	Site Added to Database	Numerous releases of gasoline and diesel documented.	Former Staff
5/18/1989	Interim Removal Action Approved	(Old R:Base Action Code = SC - Site Control (Emergency Response)). 60 cubic yards of contaminated soil from around line, stockpiled within tank berm surrounding tank #7. Repaired line and began diesel product removal in groundwater in open excavation.	Former Staff
5/31/1989	Notice of Violation	Sent to Tesoro Alaska Pipeline Company; Tesoro reported spill; retained Environmental Strategies Corp. for site investigation.	Former Staff
6/19/1989	Update or Other Action	(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Draft outline for investigative work plan sent. A more detailed plan sent 7/10/89 by Environmental Strategies Corporation.	Former Staff
7/10/1989	Site Characterization Report Approved	(Old R:Base Action Code = SI - Site Investigation). Site investigation report by Environmental Strategies Corp. Site investigation detected 1400 ppm benzene in truck load rack area.	Former Staff
7/10/1989	Site Characterization Workplan Approved	(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Approved site investigation plan; expanded to include investigation of Truck Loading Rack (TLR) area.	Former Staff
9/11/1989	Interim Removal Action Approved	(Old R:Base Action Code = REM - Removal / Excavation). ADEC approval to dispose of approximately 375 cubic yards soil with AS&G.	Former Staff
9/14/1989	Update or Other Action	(Old R:Base Action Code = F - Site Treatment, Soil/H2O). Application to install additional recovery well; backfill pipeline excavation at Tank #7; Approval (?)	Former Staff
6/15/1990	Cleanup Plan Approved	(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Proposal to use Bolsing process instead of AS and G for 375 cubic yards of soil; upgrading TLR area; approved.	Former Staff
6/16/1990	Interim Removal Action Approved	(Old R:Base Action Code = REM - Removal / Excavation). Removal of 670 cubic yards of contaminated soil during this period from maintenance activity.	Former Staff
6/16/1990	Update or Other Action	(Old R:Base Action Code = F - Site Treatment, Soil/H2O). TLR Recovery/MW have been installed.	Former Staff
9/5/1990	Update or Other Action	(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Proposal to use bio-remediation on 670 cubic yards approved.	Former Staff
9/17/1990	Update or Other Action	(Old R:Base Action Code = F - Site Treatment, Soil/H2O). Scheduled to treat 375 cubic yards with Bolsing process; Sound Environmental Services	Former Staff
11/27/1990	Site Ranked Using the AHRM	Initial ranking.	Former Staff
3/1/1992	Update or Other Action	(Old R:Base Action Code = DD - Decision Document (CERCLIS)). Final bioremediation report of Port area contaminated soils. Sign off of final document results.	Former Staff
4/23/1992	Update or Other Action	Site Closure Approved this date was rescinded.	Jim Frechione
5/6/1999	Update or Other Action	ADEC review of "Tesoro Port of Anchorage Terminal, Comprehensive Site Assessment Report" dated December 10, 1998. This letter rescinds the Alternative Cleanup Levels (ACLs) for PUG facilities granted in the Department’s letter of March 12, 1998. The ACLs of 5,500 mg/kg for diesel range organics (DRO) and 1,500 mg/kg for gasoline range organics (GRO) were developed based on default commercial/industrial exposure factors for worker exposure, and on default soil parameters. Ecological and water quality concerns were not addressed during the development of the ACLs. The Department granted the ACLs contingent upon the PUG or individual facilities completing a risk assessment to assess the risk posed by soil and groundwater contamination. This was not done.	Eileen Olson
9/15/1999	Update or Other Action	ADEC letter requesting surface water sampling and installation of groundwater monitoring wells.	Eileen Olson
10/4/1999	Update or Other Action	ADEC review and conditional approval of revised Final Water Quality Characterization Workplan" dated September 22, 1999.	Eileen Olson
4/12/2000	Update or Other Action	Date of spill which overflowed facility: from news article: Cleanup workers have recovered 3,789 gallons of jet fuel from a spill Thursday at the Tesoro tank farm in Anchorage, according to the Department of Environmental Conservation. The total amount of fuel spilled will probably turn out to be in the range of 4,000 to 5,000 gallons, said John Bauer, an environmental specialist with the DEC, "The fuel doesn't appear to be flowing into a small stream near the site any longer", Bauer said. "We don't see any more sheens on the stream," he said. Still, a dam that traps fuel but allows water to flow underneath remains in place just in case. The jet fuel spilled Thursday after pressure built up in a line connecting the Tesoro refinery in Nikiski with a tank farm on Government Hill in Anchorage. The pressure blew a cap on a strainer at the Anchorage tank farm, and the fuel overflowed a concrete containment area.	Eileen Olson
7/3/2000	Update or Other Action	Conditionally approved monitoring well/groundwater probe and surface water sampling plan.	Eileen Olson
7/3/2000	Update or Other Action	Changed site name in database to "Port of Anchorage Tesoro #1".	Eileen Olson
7/3/2000	Update or Other Action	Letter out: Conditional approval of "Tesoro Alaska Company Anchorage Terminal #1, 2000 Water Quality Monitoring Plan" dated April 14, 2000	Eileen Olson
8/12/2000	Update or Other Action	Sent letter reviewing report titled Data Transmittal - May 2000 Water Quality Monitoring; requested sampling of discharge water	Eileen Olson
2/16/2005	Meeting or Teleconference Held	Site visit and meeting with Peter Ribbens to discuss site status and GW monitoring program.	Linda Nuechterlein
7/24/2006	Update or Other Action	On July 12, 2006 ADEC met with Peter Ribbens of Tesoro and Darci Bowers of Oasis to discuss potential off site migrations of contaminants in groundwater at Tesoro #1 in regards to the ongoing EPA Consent Order with the Alaska Railroad. ADEC informed Tesoro that there was evidence of off site migration onto AKRR property and that additional investigation might be warranted. Following the meeting Tesoro and Oasis went to the facility and observed sheen entering Cook Inlet from an outfall that drains a ditch/culvert along the western boundary of Tesoro #1 and also observed a strong fuel odor and sheen/emulsion in a manhole vault approximatley 150 feet upstream from the outfall. In response to this, Tesoro deployed sorbent material in the manhole vault and at the outfall and mobilized a backhoe on July 19 to excavate test pits in the area of concern. Preliminary observations showed free phase product in one test pit and petroleum impacted soil at the groundwater interface in other test pits, however the source of the sheen in the manhole and at the outfall remains unknown. Details of this investigation will be provided when the report is recieved from Oasis.	Bill O'Connell
7/24/2006	Update or Other Action	On July 20-21 2006, Tesoro conducted a line tightness test on two fuel pipelines in conjunction with the investigation noted in the previous database entry. The pipelines carry fuel from the tank farm to the Port of Anchorage fueling facility. One of the pipelines failed the tightness test, so Tesoro began excavating the pipeline on July 21. A section of the pipeline was removed, the ends capped, and tightness tests conducted on the pipeline sections north and south of the excavation. Preliminary results indicated the pipeline north of the excavation passed the tightness test, but the results for the southern section were inconclusive and test will be conducted again. The final results of these investigations will be added to the database as they become available.	Bill O'Connell
8/28/2006	Update or Other Action	Since the last update Tesoro found a leak in a fuel pipeline beneath the secondary containment area for Tanks 6 and 7. Tesoro has installed an interceptor trench north of the culvert between it and the western border of the leasehold. Site visits conducted 8/24 and 8/25 found up to 2 inches of free product in observation ports in the interceptor trench. Additionally, sheen was noted on the inlet and emanating from seeps south of the outfall despite daily dewatering of the manhole vault and interceptor trench by Tesoro. Tesoro plans to further evaluate contamination from the pipeline leak, determined to be under the secondary containment liner beneath tanks 5 and 6, by installing monitoring wells through the liner. Additional work is anticipated.	Bill O'Connell
8/31/2006	Update or Other Action	Interceptor trench extended to northern boundary of railroad property west of Tesoro leasehold. Letter sent to Peter Ribbens of Tesoro documenting teleconference from 8/30/06. In summary, Tesoro will deploy product recovery system in interceptor trench and increase dewatering of the manhole to mitigate sheen on Cook Inlet. Investigation to continue inside contaiment area to evaluate for the presence of free product beneath the liner near the location of the pipeline leak.	Bill O'Connell
9/28/2006	Update or Other Action	Since the last update, Tesoro has installed 7, 4-inch MWs in the secondary containment area and in the NW corner of their leasehold. Preliminary observations found 1.07' of product in MW-14, between tanks 6 and 7, and 0.46' of product in MW-12 NE of tank 7. Installation of MWs between the pipeline leak area and the interceptor trench has not yielded a clear picture of contaminant migration routes and it is suspected that preferential pathways created during the initial filling of the former tidal channels may be influencing migration routes.	Bill O'Connell
9/28/2006	Update or Other Action	This database entry describing proposed work at Tesoro #1 has been deleted and replaced by the entry below for 12/20/06.	Bill O'Connell
11/1/2006	Update or Other Action	Site visit conducted today. Free product recovery system is being winterized so that it may operate throughout the winter if needed. No sheen was seen on Cook Inlet today, nor was it seen during site visits on 10/9/06 or 10/12/06. Underflow weir appears to be effective in mitigating sheen on Cook Inlet	Bill O'Connell
12/20/2006	Site Characterization Report Approved	Received report 'Pipeline C 2006 Response Action Report' dated December 8, 2006. QA/QC review conducted. This reports provides summary text and data describing activities conducted at Tesoro #1 from June to December 2006. Activities included installation of monitoring wells, test pits, an interceptor trench and product recovery system, and an underflow weir to mitigate sheen entering Cook Inlet, presumably from fuel contaminated groundwater via an underground stormwater culvert. Over 1,200 gallons of petroleum have been recovered from the interceptor trench/recovery system. Surface water sampling indicates stormwater is being contaminated by groundwater as it passes through the stormwater culvert west of the facility with TAH concentrations exceeding AWQS in several locations. Soil samples collected from test pits, excavations, and boreholes contained DRO and/or GRO and/or BTEX at concentrations above ADEC Method Two Migration to Groundwater cleanup levels at various locations around the facility. Groundwater samples contained DRO and/or GRO and/or BTEX at concentrations above Table C cleanup levels in 23 of 28 wells sampled across the facility.	Bill O'Connell
2/2/2007	Exposure Tracking Model Ranking	Intitial Ranking Complete for Source Area: 71579 (Autogenerated Action)
5/3/2007	Update or Other Action	Recieved 2006 Annual Water Quality Monitoring Report for Tesoro #1 and conducted QA/QC review. 28 wells were sampled and two surface water samples were collected in November 2006. Benzene exceeded the Table C cleanup level in 11 wells, GRO in 5 wells and DRO in 21 wells. Surface water samples exceeded AWQS for BTEX in both samples.	Bill O'Connell
5/10/2007	Update or Other Action	Received 2007 Product Containment, Recovery, and Monitoring Plan for Tesoro #1. Tesoro will deploy and maintain sorbent boom in Cook Inlet and absorbent piilows in the stormdrain vault to mitigate sheen entreing Cook Inlet. Product recovery tank will be gauged 2x per week and skimmers will be adjusted as needed.	Bill O'Connell
10/25/2007	Update or Other Action	Site visit conducted today. The storm drain realignment project has been completed. The section of pipe traversing the contaminated area has been abandoned in place, and water is flowing through the re-routed storm drain. No sheen was present in the storm drain manholes or on Cook Inlet. Product collection continues.	Bill O'Connell
5/19/2008	Update or Other Action	Site visit conducted today. No sheen was present at the outfall or on the waters of Cook Inlet. Significant amount of product present in the former manhole vault.	Bill O'Connell
9/8/2008	Site Characterization Report Approved	Received 2007 Monitoring, Investigation and Remediation Report. Ten monitoring wells were installed, 5 of which are suitable for use as product recovery wells. The wells were installed in the secondary containment cell, near the C-Line release point, near the realigned storm drain and to replace existing wells where the screened interval was submerged. Additional activities conducted to evaluate the nature and extent of petroleum contamination included fluid property sampling, a bail down test, an SVE pilot test and slug testing. Groundwater and surface water samples were collected in June '07, September '07, and February '08. LNAPL recovery included skimming product from the interceptor trench, the former storm drain vault, and MWs 27, 14, 26, 28, and 29. Recovered product from 1/1/07 to 3/31/08 was approximately 5,167 gallons. Total product collected since release is approximately 6,400 gallon. Following attempts to mitigate sheen on Cook Inlet, the storm drain was realigned (see action 10/25/07) and bentonite dams put in place along the storm drain to keep preferential pathways from forming in the backfill. The 2007 investigation found that the LNAPL plume extends beneath the entire containment cell beneath tanks 6 and 7 due to the highly permeable sand placed in this area to construct the tanks, but the plume most likely ends at the interceptor trench as evidenced by the absence of LNAPL west of the trench. See next action for sample results.	Bill O'Connell
9/9/2008	Site Characterization Report Approved	The results of groundwater sampling in 2007 and early 2008 indicate dissolved phase hydrocarbon concentrations are generally stable compared to previous years. Wells that have been impacted by the C-line release typically have higher benzene concentrations when compared with wells outside this area. Wells in the impacted area contain benzene up to 1.8 mg/l and DRO up to 180 mg/l. Well NS-1 located at the truck loading rack within the interior of the facility was sampled for the first time since 1998 had benzene at 2.68 mg/l and GRO at 28.3 mg/l. Surface water sampling in the ditch along the western boundary of the leasehold contained benzene at 0.023 mg/l at the southern most sampling point where the ditch meets the property. A sample collected approximately 500 feet downstream where the ditch enters the underground culvert did not contain detectable concentrations of hydrocarbons indicating the wetland in this area effectively mitigates hydrocarbon concentrations in surface water. Samples collected from the new manholes along the realigned storm drain contained detectable concentrations of benzene up to 0.042 mg/l and GRO up to 0.284 mg/l indicating contaminated groundwater may be infitrating the storm drain upgradient of the realignment. BTEX concentrations in water samples collected from the two new manholes exceeded AWQS.	Bill O'Connell
4/27/2009	Site Visit	Site visit today, a light sheen was seen emanating from the storm drain outfall. The product recovery system was not operating due to low product levels, but it is anticipated that it will be operating in the near future.	Bill O'Connell
6/12/2009	Document, Report, or Work plan Review - other	Reviewed 2008 Monitoring and Remediation Report, Anchorage Terminal 1. Groundwater samples were collected two occasions in 2008, May and October. LNAPL was present in 20 wells during on eor more sampling event up to 1.74 feet in at MW-12. Samples were collected from 32 wells during one or both sampling events in 2008 with contaminant concentrations similar to pre-2007 levels, which were generally lower. Benzene was detected up to 5.9 mg/k in well PW-19B, along the southern boundary of the site away from the LNAPL area. DRO was deteced up to 69.3 mg/l in well MW-24 and GRO was detected up to 13.2 mg/l in the same well located on the edge of the LNAPL plume in between tanks 6 & 7. Benzene concentrations increased in well MW-20 from less the 2 ug/l in 2007 to 99.6 ug/l in October 2008 signifying the migration of the dissolved phase plume towards this well north of the property boundary due to the change in groundwater flow as mentioned below. LNAPL recovery was conducted throughout most of 2008 with approximately 1,900 gallon recovered, bringing the total since the system was installed to 8,300 gallons. The recovery rate in 2008 was approximately 8.6 gallons per day compared to 11.5 gallons per day in 2007. Groundwater flow patterns and elevations changed as a result of the storm drain realignment causing LNAPL to migrate to MW-17 for the first time in 2008. A skimmer was deployed in this well to recover the product, which measured up to 1.62 feet in thickness. A vacuum enhanced LNAPL recovery system was installed near well MW-17 and two new recovery wells, MW-31 and MW-32, were added as part of the system. Surface water samples were collected along the open culvert west of the facility where it meets the facility boundary, where the culvert goes underground, and in the two manholes along the newly realigned section. The May surface water samples contained contaminant concentrations near historic lows, however the October samples contained contaminant concentrations enar historic highs, with benzene detected at 0.0961 mg/l and GRO detected at 0.534 mg/l. The other surface water samples indicate these contaminant concentrations are significantly reduced as stormwater travels through the vegetated culvert, but that groundwater continues to infiltrate the storm drain along the realigned portion as evidenced by an increase in contaminant concentrations from the southern manhole to the northern manhole just upstream from the outfall, where benzene was detected up to 0.0231 mg/l and DRO up to 1.66 mg/l.	Bill O'Connell
3/15/2010	Risk Assessment Report Approved	Reviewed Risk Assessment for Tesoro. This RA is included in Appendix B of the Final Remedial Investigation Report, Alaska Railroad Corporation, Anchorage Terminal Reserve, ADEC File #2100.28.447. The RA indicates risks above benchmark criteria for construction workers via direct contact with groundwater, for site workers via the inhalation of indoor vapors at the pipeline control building, and for all receptors via the groundwater ingestion pathway. These exposure pathways will be addressed in the Feasibility Study. (Update added 1/11/12)	Bill O'Connell
3/16/2010	Document, Report, or Work plan Review - other	Reviewed Feasibility Study Report for Tesoro #1. The FS was conducted to satisfy the requirments of the EPA/ARRC AOC as this facility is on property owned by ARRC. The FS evaluated remedial options for several sub-areas of the facility including the Pipeline Alley, Northern Tank Farm (C-line plume), Southern Tank Farm and Truck Loading Rack, Ocean Dock Road, and the Pipeline Manifold Area. Alternatives considered at each site included No Action, Institutional Controls (ICs), and Monitored Natural Attenuation (MNA), except at the Pipeline Alley, where only No Action and MNA were considered. The recommended alternative site wide is ICs and MNA. The objective of ICs would be to control worker exposure during work activities and would include proper PPE, air monitoring, and engineering controls implemented using Tesoro's existing permitting process. While MNA would likely be very slow due to low groundwater flux and the presence of pavement, the risk of exposure is such that monitoring contaminant trends across the site would be an effective means of controlling future exposure to contaminants.	Bill O'Connell
4/27/2010	Document, Report, or Work plan Review - other	Reviewed 2009 Monitoring, Investigation, and Remediation Report for Tesoro #1. Activities conducted in 2009 included groundwater and surface water sampling, LNAPL recovery, and a soil-gas survey to evaluate vapor intrusion. Groundwater monitoring events were conducted in May and November 2009. During the May event, 29 wells were sampled for GRO and BTEX and during the November event, 18 wells were sampled. Additional analyses were conducted on groundwater samples from the November monitoring event including the full list of VOCs (8260B), SVOCs (8270D), EDB, and lead. Sitewide well gauging found measurable free product in 14 different wells ranging from 0.01 feet to 1.76 feet in thickness. Contaminant concentrations were generally stable across the site, with GRO detected up to 24.4 mg/l and benzene up to 13.0 mg/l in well PW-19B during the May sampling event, and DRO detected up to 37.9 mg/l in well MW-04 during the November event. VOCs (excluding BTEX) and SVOCs were not detected above Table C groundwater cleanup levels, however some analytes had detection limits above the Table C cleanup level. EDB and EDC were not detected. The dissolved-phase plume resulting from the C-pipeline release is migrating downgradient as evidenced by the increase of benzene concentrations in wells MW-21R and MW-22. Groundwater data indicate, and the report concludes, that the contaminants found in Monitoring well MWE17 are not from the Tesoro #1 facility and might be related to releases at other upgradient sites. A statistical evaluation of benzene data from several wells from 1998 to the present indicate a very slight decreasing trend, presumably due to the low natural attenuation rate at the site. The LNAPL plume resulting from the 2005/06 C-pipeline leak is considered stable, with approximately 5,600 gallons of product recovered in 2009 and 14,000 gallons of product recovered to date. Surface water samples were collected from the north and south manholes in the rerouted storm drain in May, June, and November 2009 and from upstream surface water sampling locations SW-2 and SW-4 in May and November. Samples from the north and south manholes and from sampling location SW-4 contained TAH and TAqH above Alaska Water Quality Standards, with TAH detected up to 32.9 ug/l and TAqH up to 34.5 mg/l both at the south manhole during the November event. Based on storm drain sample results, it appears that contaminated groundwater continues to infiltrate the storm drain upstream of the south manhole causing exceedances of AWQS. Soil gas sampling was conducted at the Operations Building and the Pipeline Office Building to support vapor intrusion analysis. Results show that hydrocarbon contamination in soil and groundwater at the site is not causing vapor intrusion into the buildings where sampling was conducted. Benzene was not detected in the samples, however trichlorofluoromethane was detected at concentrations resulting in a Hazard Index above the benchmark for some soil types. Additional investigation of the nature and extent of trichlorofluoromethane contamination is planned for 2010. A QA/QC review of data collected during these investigations indicates the data is valid for its intended purpose, except for the lead in groundwater data which was rejected.	Bill O'Connell
4/11/2011	Document, Report, or Work plan Review - other	Reviewed 2010 Monitoring and Remediation Report. Groundwater monitoring events were conducted on two occasions, once in May and once in September 2010. 23 monitoring wells were sampled during the May event and 10 wells were sampled during the September event. Benzene was detected up to 4.2 mg/l in well PW-19b, GRO was detected up to 6.6 mg/l in the same well, and DRO was detected up to 13.7 mg/l in well MW-04 in 2010. Contaminant concentrations were generally stable when compared with last year’s results. Product recovery from the 2005/06 C-Pipeline Release continued with approximately 1,700 gallon of product recovered in 2010 for a total of approximately 15,700 gallons recovered to date. Surface water samples were collected from the drainage along the west side of the tank farm and also from manholes along the buried portion of the storm drain. Data indicate storm water is impacted by hydrocarbons both from surface sources upstream of the facility and also from leakage of impacted groundwater from the facility into the storm drain. Surface water monitoring will continue until the impacts from Port Expansion activities are known, at which time the need for corrective action will be determined. 2011 activities will include continued monitoring and an evaluation of trichlorofluoromethane impacts to soil groundwater, and soil gas at the Pipeline Office.	Bill O'Connell
4/18/2011	Site Visit	Site visit to inspect storm drain outfall. No sheen was observed	Bill O'Connell
1/12/2012	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 71579 Bulk fuel tanks.	Bill O'Connell
5/24/2013	Document, Report, or Work plan Review - other	Reviewed 2012 Monitoring and Remediation Report for Tesoro #1. Twenty wells were sampled during the May event and 11 were sampled during the September event. In May, benzene was detected up to 3.50 mg/l and GRO was detected up to 3.85 mg/l, both in well PW-19b located near the pipeline warehouse. DRO was detected up to 12.7 mg/l in well MW-22 located on the far side of Ocean Dock road near Cook Inlet. Surface water sampling found benzene at 0.0486 mg/l along the upper reaches of the drainage ditch along the west side of the side. Benzene concentrations were reduced to 0.00098 mg/l further along the drainage where it enters the underground culvert, then increased again to 0.00592 mg/l in the manhole near the outfall. This suggests that contaminated groundwater is still infiltrating the storm drain, but not at concentrations above water quality standards. During the September event, benzene was detected up to 0.255 mg/l in well MW-04 (PW-19b was not sampled) located along the eastern edge of the site. GRO was detected up to 5.2 mg/l and DRO was detected up to 15.4 mg/l in this same well. Free product was noted in 8 wells up to 2.1 feet thick in MW-12 in May. The highest groundwater elevations to date were measured during the September event, essentially submerging the NAPL source areas and resulting in product thickness of 0.01 feet in 6 wells. Due to higher than usual groundwater elevations, the product recovery system recovered only negligible amounts of product so the system will continue to operate in 2013. To date, approximately 16,100 gallon of product have been recovered. The SVE system was not operated due to high water levels, but will be restarted if water levels fall in 2013.	Bill O'Connell
6/5/2013	Document, Report, or Work plan Review - other	Reviewed 2011 Monitoring and Remediation Report for Tesoro #1 received via email in may 2013. Sampling events were conducted in May and October 2011. 20 wells were sampled during the May event; benzene was detected up to 0.827 mg/l in well MW-25, GRO was detected up to 4.7 mg/l also in well MW-25 and DRO was detected up to 18.9 mg/l in well MW-04. 11 wells were sampled in October; benzene was detected up to 0.407 mg/l in well RW-PL, GRO was detected up to 3.96 mg/l in well MW-04 and DRO was detected up to 22.2 mg/l also in MW-04. Free product was found in 17 wells up to 1.714 feet thick in well MW-12. Most wells contained only minimal product at 0.01 feet thick. Surface water samples were collected from the drainage along the west side of the site. As in previous years, benzene was detected at its highest concentration, 0.05 mg/l, at the point where the drainage enters the property, is reduced to 0.067 mg/l where the drainage enters the underground culvert, then increases again at the manhole before daylighting into Cook Inlet. Samples from this manhole contained benzene at 0.00796 mg/l in the May sample and 0.0137 mg/l in the October sample. The SVE system operated as planned in 2011 and approximately 437 gallon of free product were recovered from the product recovery system.	Bill O'Connell
6/26/2014	Document, Report, or Work plan Review - other	Reviewed 2013 Monitoring and Remediation Report for Anchorage Terminal #1. Groundwater samples were collected from 18 wells at the site in May and/or September 2013. Benzene, GRO, and DRO were detected above cleanup levels in 12 of the wells with benzene detected up to 565 ug/l in well MW-25, GRO up to 6.65 mg/l in well MW-04 and DRO up to 29.8 mg/l, also in well MW-04. Sentinel wells MW-21R and MW-22 contained contaminants above cleanup levels with benzene detected up to 16.5 ug/l in MW-21R and DRO detected at 17.1 mg/l in MW-22. Surface water samples were collected from three established monitoring locations; one where the storm water ditch enters the Tesoro leasehold (SW-4), one where the ditch enters an underground culvert, and one in the manhole just upstream of the outfall. Each of these samples contained BTEX above Alaska Water Quality Standards due to the benzene concentrations. The LNAPL recovery system did not operate in 2013 due to high groundwater levels, which likely submerged the remaining LNAPL resulting in less recoverable LNAPL in the product recovery trench. High water levels also likely resulted in submerged well screens in the monitoring wells that were sampled, potentially biasing the samples low. The report indicates Tesoro will be proposing alternative cleanup levels and a groundwater use determination under 18 AAC 75.350 in 2014. Biannual groundwater and surface water monitoring will continue in order to monitor natural attenuation, storm water quality, and for leak detection purposes. The LNAPL recovery system will be maintained and restarted if/when water levels drop and LNAPL becomes recoverable.	Bill O'Connell
1/14/2015	Meeting or Teleconference Held	Meeting with Tesoro and consultant regarding Terminal 1 product recovery system status, rail rack rehab, and future sampling efforts	Bill O'Connell
5/19/2015	Document, Report, or Work plan Review - other	Reviewed 2014 Monitoring and Remediation Report for Tesoro Anchorage Terminal #1. Groundwater and surface water samples were collected on two occasions, once in June and again in October. Additionally, the presence of Freon-11 in previous soil vapor samples was investigated by collecting additional soil vapor, soil, and groundwater samples in the vicinity of the pipeline control building. The vacuum enhanced product recovery system in place to recover free product from the 2006 C Pipeline release did not operate in 2014 due to high groundwater levels, which led to a lack of recoverable product in the recovery system wells. Free product was identified in 5 wells during one or both monitoring vents, but at trace concentrations only, likely due to high groundwater levels. Contaminant concentrations in groundwater were generally stable in 2014 and consistent with previous data collected at the site. Benzene concentrations increased in MW-21r along the western edge of the site near Cook Inlet. Surface water sample data was also consistent with previous results. Surface water in the storm water ditch along the west side of the facility is contaminated with benzene when it meets Tesoro’s lease lot. Benzene concentrations appear to attenuate in the open portion of the ditch, but then it appears as though contaminated groundwater continues to infiltrate the storm drain as benzene concentrations increase again in the underground portion of the drain. A sample collected just up from the outfall exceeded TAH criteria due to the presence of benzene. Based on the data set for this site, Tesoro proposes sampling fewer wells in 2015. Monitoring wells PW-18, RW-PL, MW-20, MW-21R, and MW-30 will be sampled twice in 2015 and surface water samples will be collected from locations SW-2, SW-4, SW-5 and SDMH-N. The LNAPL recovery system will be operated if recoverable amounts of product are present in recovery wells and the SVE system will be operated if groundwater levels fall. A portion of the LNAPL recovery system is located on the former rail loading rack, which is proposed for improvements in 2015. If part of the system need to be decommissioned, a plan will be submitted providing details. Tesoro also proposes investigating the potential migration of contaminants to the west into the newly created South Backlands Area and further investigation of the migration of contaminated groundwater into the storm drain by conducting a camera inspection.	Bill O'Connell
6/13/2016	Document, Report, or Work plan Review - other	Reviewed Final 2016 Annual Report for Tesoro Terminal 1. Groundwater samples were collected from 5 monitoring wells in June and again in October 2015. Benzene was detected in each well above the cleanup level at concentrations ranging from 15.5 ug/l in MW-21r in October, to 505 ug/l in RW-PL in May. DRO was detected above the cleanup level at concentrations ranging from 2.31 mg/l in PW-18 in October to 40.6 mg/l in MW-21r in May. DRO was not detected above the cleanup level in RW-PL. Surface water sampling indicated petroleum contaminated surface water entering the site generally attenuates in the open portion of the storm drain ditch, but then benzene concentrations increase in the underground portion of the storm drain. Sampling indicates a steady increase in benzene concentrations, with a somewhat more marked increase approximately 40-80 feet from sampling location SW-5. A camera inspection of the storm drain did not reveal any obvious breaks, rather it is suspected that contaminated groundwater is slowly seeping into the drain along its entire underground course. The Vacuum-enhanced product recovery system did not operate again in 2015 due to high water level and minimal LNAPL in the recovery wells. The report indicates an LNAPL recovery system evaluation will be conducted in 2016 followed by a remedial alternatives evaluation, if warranted.	Bill O'Connell
5/23/2017	Document, Report, or Work plan Review - other	Reviewed May 8, 2017 Work Plan. Activities included routine groundwater sampling to monitor the dissolved phase plume, installation and sampling of MW-33 to replace MW-19 and MW-20, and surface water sampling associated with groundwater migration into the storm drain.	Wendy Hansen
11/6/2017	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 71579 Bulk fuel tanks.	Bill O'Connell
3/28/2018	350 Determination	A groundwater use determination under 18 AAC 75.350 has been issued for the Tesoro #1 tank farm at the Port of Anchorage based on the justification provided in the Revised 18 AAC 75.350 Groundwater use Determination Request, Anchorage Terminal 1, Port of Anchorage, Alaska dated January 8, 2018. This determination states that the shallow groundwater overlying the bootlegger cove clay formation is not a current or potential future source of drinking water.	Bill O'Connell
8/14/2018	Document, Report, or Work plan Review - other	The ADEC has reviewed the Supplemental Remedial Action Plan for Groundwater for Terminal 1, for the Tesoro #1 Port of Anchorage site (2100.38.311) and has no objections.	Chelsy Passmore
4/14/2021	Meeting or Teleconference Held	Annual meeting with Marathon/Tesoro, Trihydro, and DEC Project Managers to review monitoring results and activities reported in 2020 and discuss plans moving forward for 2021.	Jamie Grant
4/15/2021	Document, Report, or Work plan Review - other	Reviewed a 2020 Annual Groundwater Monitoring Report for Tesoro Terminal 1. Fluid levels in 42 wells were gauged and four monitoring wells (MW-30, MW-33, PW-18, and RW-PL) were sampled in the spring of 2020. Samples were analyzed for DRO and BTEX compounds. LNAPL was present and measured in MW-12 (0.37 ft) and MW-31 (0.56 ft); two wells that were located within the C-line release plume area. Overall, groundwater sampling results were similar to data from previous sampling events, with benzene and DRO concentrations slightly higher in 2020 than 2019 in some wells, but overall consistent with decreasing trends. Surface water samples were collected from the storm drain prior to the outfall (from manholes SW-2, SW-5, SDMH-N, and SDMH-S)and analyzed for TAH, GRO, and DRO . Surface water samples collected from the storm drain system exceeded the water quality standard for TAH (10 µg/L) at SW-5, SDMH-N, and SDMH-S. These results were higher than 2019, but generally lower than historical highs with the exception of SW-5 where TAH was 408.57 µg/L. This was primarily driven by the presence of Benzene (405 µg/L) in the sample, the source of which is unknown at this time. Samples were not collected at Terminal #1 in fall 2020 due to COVID-19 restrictions.	Jamie Grant
5/6/2021	Document, Report, or Work plan Review - other	Reviewed the Sampling and Analysis Plan for annual (2021) groundwater monitoring activities. The SAP was approved with the following condition: RP to modify sample collection method from bailer to one approved in the Field Sampling Guidance (ADEC, 2019) to prevent loss of volatiles.	Jamie Grant
4/6/2022	Document, Report, or Work plan Review - other	2021 Annual Groundwater Monitoring report, prepared by Tryhdyro, was submitted by the Tesoro Alaska Company. LNAPL was found in MW-12, MW-17, MW-26, and MW-31 during the June and October sampling events. These wells are within the C-Line plume release area at the northern portion of the site. Monitoring wells with benzene, ethylbenzene, and DRO above DEC groundwater cleanup levels was consistent with past results. One storm drain was also sampled (SDMH-S) and exceeded surface water standards for total aromatic hydrocarbons (TAH) in October. The other storm drain (SDMH-N) was not sampled due to trenchwork. Tesoro plans to sample using low flow methods and review historical data for compliance with current cleanup levels in next report. Report approved 6/8/22.	Janice Wiegers
4/25/2022	Update or Other Action	Notified by DEC's Prevention Preparedness and Response Program of a spill at Tank #9 (transmix tank) at the south end of Terminal 1. PetroStar now operates this terminal, but Marathon (formerly Tesoro) retains operational responsibility for tank #9 because if it tied into their other facility. Fuel spilled into secondary containment of Tank #8 last November, but product and sheen are visible in the stormwater ditch outside of containment now that snow is melting. Marathon is responding by using a vac truck to remove water for treatment, and preparing to sample stormwater before removing soil pile used to stop water flow in ditch. PPRP will also request soil sampling in ditch area where impacts were noted and sediments sampling in two downstream vaults. Soil/sediment removal may be necessary. Conversation with the POA on 4/26 indicated that the stormwater outfall from this area is not permitted under the Port's MS4 but will be in the future as Outfall 9.	Janice Wiegers
8/18/2022	Document, Report, or Work plan Review - other	Provided comments on "Revised Supplemental Remedial Action Plan for Groundwater Well Installation and Sulfate Injection" Sulfate, nitrates, bacteria, and nutrients are to be injected into the permeable reactive barrier. In addition 3 down-gradient wells will be installed.	Michael Hooper
9/20/2022	Document, Report, or Work plan Review - other	Approved Revised Supplemental Remedial Action Plan for Groundwater Well Installation and Sulfate Injection dated September 16, 2022. A nutrient/microbe blend will be injected into the PRB though 5 temporary points to ensure favorable conditions for contaminant breakdown.	Michael Hooper
6/6/2023	Document, Report, or Work plan Review - other	Reviewed Soil and Groundwater Management Report – Port of Alaska Modernization Program (2021 to 2022), dated December 2022 and submitted by BGES for work completed during Phase 2. Pacific Pile & Marine removed and tested soil near two contaminated sites: Port of Anchorage ABI Cement Terminal (Hazard ID 26258) in the southern portion of the project area and Tesoro #1 Port of Anchorage (Hazard ID 600) in the central portion of the project area. Approximately 1,309 cubic yards of obviously contaminated soil was treated at Alaska Soil Recycling. Another 4,448 cubic yards of potentially contaminated soil was stockpiled and then sent to the Anchorage landfill for disposal. Dewatering also took place in the central and southern project areas and temporarily held in weir tanks until sampling could be completed. Water was discharged to the Anchorage Wastewater Utility’s sanitary sewer system. DEC sent letter approving the report to Pacific Pile & Marine.	Janice Wiegers
10/10/2024	Long Term Monitoring Workplan or Report Review	Approved Monitoring report for Terminal 1. Trends in contaminant concentrations are similar to prior years.	Michael Hooper

Action Date

Action

Description

DEC Staff

5/18/1989

Site Added to Database

Numerous releases of gasoline and diesel documented.

Former Staff

5/18/1989

Interim Removal Action Approved

(Old R:Base Action Code = SC - Site Control (Emergency Response)). 60 cubic yards of contaminated soil from around line, stockpiled within tank berm surrounding tank #7. Repaired line and began diesel product removal in groundwater in open excavation.

Former Staff

5/31/1989

Notice of Violation

Sent to Tesoro Alaska Pipeline Company; Tesoro reported spill; retained Environmental Strategies Corp. for site investigation.

Former Staff

6/19/1989

Update or Other Action

(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Draft outline for investigative work plan sent. A more detailed plan sent 7/10/89 by Environmental Strategies Corporation.

Former Staff

7/10/1989

Site Characterization Report Approved

(Old R:Base Action Code = SI - Site Investigation). Site investigation report by Environmental Strategies Corp. Site investigation detected 1400 ppm benzene in truck load rack area.

Former Staff

7/10/1989

Site Characterization Workplan Approved

(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Approved site investigation plan; expanded to include investigation of Truck Loading Rack (TLR) area.

Former Staff

9/11/1989

Interim Removal Action Approved

(Old R:Base Action Code = REM - Removal / Excavation). ADEC approval to dispose of approximately 375 cubic yards soil with AS&G.

Former Staff

9/14/1989

Update or Other Action

(Old R:Base Action Code = F - Site Treatment, Soil/H2O). Application to install additional recovery well; backfill pipeline excavation at Tank #7; Approval (?)

Former Staff

6/15/1990

Cleanup Plan Approved

(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Proposal to use Bolsing process instead of AS and G for 375 cubic yards of soil; upgrading TLR area; approved.

Former Staff

6/16/1990

Interim Removal Action Approved

(Old R:Base Action Code = REM - Removal / Excavation). Removal of 670 cubic yards of contaminated soil during this period from maintenance activity.

Former Staff

6/16/1990

Update or Other Action

(Old R:Base Action Code = F - Site Treatment, Soil/H2O). TLR Recovery/MW have been installed.

Former Staff

9/5/1990

Update or Other Action

(Old R:Base Action Code = RAPR - Remedial Action Plan Review (CS)). Proposal to use bio-remediation on 670 cubic yards approved.

Former Staff

9/17/1990

Update or Other Action

(Old R:Base Action Code = F - Site Treatment, Soil/H2O). Scheduled to treat 375 cubic yards with Bolsing process; Sound Environmental Services

Former Staff

11/27/1990

Site Ranked Using the AHRM

Initial ranking.

Former Staff

3/1/1992

Update or Other Action

(Old R:Base Action Code = DD - Decision Document (CERCLIS)). Final bioremediation report of Port area contaminated soils. Sign off of final document results.

Former Staff

4/23/1992

Update or Other Action

Site Closure Approved this date was rescinded.

Jim Frechione

5/6/1999

Update or Other Action

ADEC review of "Tesoro Port of Anchorage Terminal, Comprehensive Site Assessment Report" dated December 10, 1998. This letter rescinds the Alternative Cleanup Levels (ACLs) for PUG facilities granted in the Department’s letter of March 12, 1998. The ACLs of 5,500 mg/kg for diesel range organics (DRO) and 1,500 mg/kg for gasoline range organics (GRO) were developed based on default commercial/industrial exposure factors for worker exposure, and on default soil parameters. Ecological and water quality concerns were not addressed during the development of the ACLs. The Department granted the ACLs contingent upon the PUG or individual facilities completing a risk assessment to assess the risk posed by soil and groundwater contamination. This was not done.

Eileen Olson

9/15/1999

Update or Other Action

ADEC letter requesting surface water sampling and installation of groundwater monitoring wells.

Eileen Olson

10/4/1999

Update or Other Action

ADEC review and conditional approval of revised Final Water Quality Characterization Workplan" dated September 22, 1999.

Eileen Olson

4/12/2000

Update or Other Action

Date of spill which overflowed facility: from news article: Cleanup workers have recovered 3,789 gallons of jet fuel from a spill Thursday at the Tesoro tank farm in Anchorage, according to the Department of Environmental Conservation. The total amount of fuel spilled will probably turn out to be in the range of 4,000 to 5,000 gallons, said John Bauer, an environmental specialist with the DEC, "The fuel doesn't appear to be flowing into a small stream near the site any longer", Bauer said. "We don't see any more sheens on the stream," he said. Still, a dam that traps fuel but allows water to flow underneath remains in place just in case. The jet fuel spilled Thursday after pressure built up in a line connecting the Tesoro refinery in Nikiski with a tank farm on Government Hill in Anchorage. The pressure blew a cap on a strainer at the Anchorage tank farm, and the fuel overflowed a concrete containment area.

Eileen Olson

7/3/2000

Update or Other Action

Conditionally approved monitoring well/groundwater probe and surface water sampling plan.

Eileen Olson

7/3/2000

Update or Other Action

Changed site name in database to "Port of Anchorage Tesoro #1".

Eileen Olson

7/3/2000

Update or Other Action

Letter out: Conditional approval of "Tesoro Alaska Company Anchorage Terminal #1, 2000 Water Quality Monitoring Plan" dated April 14, 2000

Eileen Olson

8/12/2000

Update or Other Action

Sent letter reviewing report titled Data Transmittal - May 2000 Water Quality Monitoring; requested sampling of discharge water

Eileen Olson

2/16/2005

Meeting or Teleconference Held

Site visit and meeting with Peter Ribbens to discuss site status and GW monitoring program.

Linda Nuechterlein

7/24/2006

Update or Other Action

On July 12, 2006 ADEC met with Peter Ribbens of Tesoro and Darci Bowers of Oasis to discuss potential off site migrations of contaminants in groundwater at Tesoro #1 in regards to the ongoing EPA Consent Order with the Alaska Railroad. ADEC informed Tesoro that there was evidence of off site migration onto AKRR property and that additional investigation might be warranted. Following the meeting Tesoro and Oasis went to the facility and observed sheen entering Cook Inlet from an outfall that drains a ditch/culvert along the western boundary of Tesoro #1 and also observed a strong fuel odor and sheen/emulsion in a manhole vault approximatley 150 feet upstream from the outfall. In response to this, Tesoro deployed sorbent material in the manhole vault and at the outfall and mobilized a backhoe on July 19 to excavate test pits in the area of concern. Preliminary observations showed free phase product in one test pit and petroleum impacted soil at the groundwater interface in other test pits, however the source of the sheen in the manhole and at the outfall remains unknown. Details of this investigation will be provided when the report is recieved from Oasis.

Bill O'Connell

7/24/2006

Update or Other Action

On July 20-21 2006, Tesoro conducted a line tightness test on two fuel pipelines in conjunction with the investigation noted in the previous database entry. The pipelines carry fuel from the tank farm to the Port of Anchorage fueling facility. One of the pipelines failed the tightness test, so Tesoro began excavating the pipeline on July 21. A section of the pipeline was removed, the ends capped, and tightness tests conducted on the pipeline sections north and south of the excavation. Preliminary results indicated the pipeline north of the excavation passed the tightness test, but the results for the southern section were inconclusive and test will be conducted again. The final results of these investigations will be added to the database as they become available.

Bill O'Connell

8/28/2006

Update or Other Action

Since the last update Tesoro found a leak in a fuel pipeline beneath the secondary containment area for Tanks 6 and 7. Tesoro has installed an interceptor trench north of the culvert between it and the western border of the leasehold. Site visits conducted 8/24 and 8/25 found up to 2 inches of free product in observation ports in the interceptor trench. Additionally, sheen was noted on the inlet and emanating from seeps south of the outfall despite daily dewatering of the manhole vault and interceptor trench by Tesoro. Tesoro plans to further evaluate contamination from the pipeline leak, determined to be under the secondary containment liner beneath tanks 5 and 6, by installing monitoring wells through the liner. Additional work is anticipated.

Bill O'Connell

8/31/2006

Update or Other Action

Interceptor trench extended to northern boundary of railroad property west of Tesoro leasehold. Letter sent to Peter Ribbens of Tesoro documenting teleconference from 8/30/06. In summary, Tesoro will deploy product recovery system in interceptor trench and increase dewatering of the manhole to mitigate sheen on Cook Inlet. Investigation to continue inside contaiment area to evaluate for the presence of free product beneath the liner near the location of the pipeline leak.

Bill O'Connell

9/28/2006

Update or Other Action

Since the last update, Tesoro has installed 7, 4-inch MWs in the secondary containment area and in the NW corner of their leasehold. Preliminary observations found 1.07' of product in MW-14, between tanks 6 and 7, and 0.46' of product in MW-12 NE of tank 7. Installation of MWs between the pipeline leak area and the interceptor trench has not yielded a clear picture of contaminant migration routes and it is suspected that preferential pathways created during the initial filling of the former tidal channels may be influencing migration routes.

Bill O'Connell

9/28/2006

Update or Other Action

This database entry describing proposed work at Tesoro #1 has been deleted and replaced by the entry below for 12/20/06.

Bill O'Connell

11/1/2006

Update or Other Action

Site visit conducted today. Free product recovery system is being winterized so that it may operate throughout the winter if needed. No sheen was seen on Cook Inlet today, nor was it seen during site visits on 10/9/06 or 10/12/06. Underflow weir appears to be effective in mitigating sheen on Cook Inlet

Bill O'Connell

12/20/2006

Site Characterization Report Approved

Received report 'Pipeline C 2006 Response Action Report' dated December 8, 2006. QA/QC review conducted. This reports provides summary text and data describing activities conducted at Tesoro #1 from June to December 2006. Activities included installation of monitoring wells, test pits, an interceptor trench and product recovery system, and an underflow weir to mitigate sheen entering Cook Inlet, presumably from fuel contaminated groundwater via an underground stormwater culvert. Over 1,200 gallons of petroleum have been recovered from the interceptor trench/recovery system. Surface water sampling indicates stormwater is being contaminated by groundwater as it passes through the stormwater culvert west of the facility with TAH concentrations exceeding AWQS in several locations. Soil samples collected from test pits, excavations, and boreholes contained DRO and/or GRO and/or BTEX at concentrations above ADEC Method Two Migration to Groundwater cleanup levels at various locations around the facility. Groundwater samples contained DRO and/or GRO and/or BTEX at concentrations above Table C cleanup levels in 23 of 28 wells sampled across the facility.

Bill O'Connell

2/2/2007

Exposure Tracking Model Ranking

Intitial Ranking Complete for Source Area: 71579 (Autogenerated Action)

5/3/2007

Update or Other Action

Recieved 2006 Annual Water Quality Monitoring Report for Tesoro #1 and conducted QA/QC review. 28 wells were sampled and two surface water samples were collected in November 2006. Benzene exceeded the Table C cleanup level in 11 wells, GRO in 5 wells and DRO in 21 wells. Surface water samples exceeded AWQS for BTEX in both samples.

Bill O'Connell

5/10/2007

Update or Other Action

Received 2007 Product Containment, Recovery, and Monitoring Plan for Tesoro #1. Tesoro will deploy and maintain sorbent boom in Cook Inlet and absorbent piilows in the stormdrain vault to mitigate sheen entreing Cook Inlet. Product recovery tank will be gauged 2x per week and skimmers will be adjusted as needed.

Bill O'Connell

10/25/2007

Update or Other Action

Site visit conducted today. The storm drain realignment project has been completed. The section of pipe traversing the contaminated area has been abandoned in place, and water is flowing through the re-routed storm drain. No sheen was present in the storm drain manholes or on Cook Inlet. Product collection continues.

Bill O'Connell

5/19/2008

Update or Other Action

Site visit conducted today. No sheen was present at the outfall or on the waters of Cook Inlet. Significant amount of product present in the former manhole vault.

Bill O'Connell

9/8/2008

Site Characterization Report Approved

Received 2007 Monitoring, Investigation and Remediation Report. Ten monitoring wells were installed, 5 of which are suitable for use as product recovery wells. The wells were installed in the secondary containment cell, near the C-Line release point, near the realigned storm drain and to replace existing wells where the screened interval was submerged. Additional activities conducted to evaluate the nature and extent of petroleum contamination included fluid property sampling, a bail down test, an SVE pilot test and slug testing. Groundwater and surface water samples were collected in June '07, September '07, and February '08. LNAPL recovery included skimming product from the interceptor trench, the former storm drain vault, and MWs 27, 14, 26, 28, and 29. Recovered product from 1/1/07 to 3/31/08 was approximately 5,167 gallons. Total product collected since release is approximately 6,400 gallon. Following attempts to mitigate sheen on Cook Inlet, the storm drain was realigned (see action 10/25/07) and bentonite dams put in place along the storm drain to keep preferential pathways from forming in the backfill. The 2007 investigation found that the LNAPL plume extends beneath the entire containment cell beneath tanks 6 and 7 due to the highly permeable sand placed in this area to construct the tanks, but the plume most likely ends at the interceptor trench as evidenced by the absence of LNAPL west of the trench. See next action for sample results.

Bill O'Connell

9/9/2008

Site Characterization Report Approved

The results of groundwater sampling in 2007 and early 2008 indicate dissolved phase hydrocarbon concentrations are generally stable compared to previous years. Wells that have been impacted by the C-line release typically have higher benzene concentrations when compared with wells outside this area. Wells in the impacted area contain benzene up to 1.8 mg/l and DRO up to 180 mg/l. Well NS-1 located at the truck loading rack within the interior of the facility was sampled for the first time since 1998 had benzene at 2.68 mg/l and GRO at 28.3 mg/l. Surface water sampling in the ditch along the western boundary of the leasehold contained benzene at 0.023 mg/l at the southern most sampling point where the ditch meets the property. A sample collected approximately 500 feet downstream where the ditch enters the underground culvert did not contain detectable concentrations of hydrocarbons indicating the wetland in this area effectively mitigates hydrocarbon concentrations in surface water. Samples collected from the new manholes along the realigned storm drain contained detectable concentrations of benzene up to 0.042 mg/l and GRO up to 0.284 mg/l indicating contaminated groundwater may be infitrating the storm drain upgradient of the realignment. BTEX concentrations in water samples collected from the two new manholes exceeded AWQS.

Bill O'Connell

4/27/2009

Site Visit

Site visit today, a light sheen was seen emanating from the storm drain outfall. The product recovery system was not operating due to low product levels, but it is anticipated that it will be operating in the near future.

Bill O'Connell

6/12/2009

Document, Report, or Work plan Review - other

Reviewed 2008 Monitoring and Remediation Report, Anchorage Terminal 1. Groundwater samples were collected two occasions in 2008, May and October. LNAPL was present in 20 wells during on eor more sampling event up to 1.74 feet in at MW-12. Samples were collected from 32 wells during one or both sampling events in 2008 with contaminant concentrations similar to pre-2007 levels, which were generally lower. Benzene was detected up to 5.9 mg/k in well PW-19B, along the southern boundary of the site away from the LNAPL area. DRO was deteced up to 69.3 mg/l in well MW-24 and GRO was detected up to 13.2 mg/l in the same well located on the edge of the LNAPL plume in between tanks 6 & 7. Benzene concentrations increased in well MW-20 from less the 2 ug/l in 2007 to 99.6 ug/l in October 2008 signifying the migration of the dissolved phase plume towards this well north of the property boundary due to the change in groundwater flow as mentioned below. LNAPL recovery was conducted throughout most of 2008 with approximately 1,900 gallon recovered, bringing the total since the system was installed to 8,300 gallons. The recovery rate in 2008 was approximately 8.6 gallons per day compared to 11.5 gallons per day in 2007. Groundwater flow patterns and elevations changed as a result of the storm drain realignment causing LNAPL to migrate to MW-17 for the first time in 2008. A skimmer was deployed in this well to recover the product, which measured up to 1.62 feet in thickness. A vacuum enhanced LNAPL recovery system was installed near well MW-17 and two new recovery wells, MW-31 and MW-32, were added as part of the system. Surface water samples were collected along the open culvert west of the facility where it meets the facility boundary, where the culvert goes underground, and in the two manholes along the newly realigned section. The May surface water samples contained contaminant concentrations near historic lows, however the October samples contained contaminant concentrations enar historic highs, with benzene detected at 0.0961 mg/l and GRO detected at 0.534 mg/l. The other surface water samples indicate these contaminant concentrations are significantly reduced as stormwater travels through the vegetated culvert, but that groundwater continues to infiltrate the storm drain along the realigned portion as evidenced by an increase in contaminant concentrations from the southern manhole to the northern manhole just upstream from the outfall, where benzene was detected up to 0.0231 mg/l and DRO up to 1.66 mg/l.

Bill O'Connell

3/15/2010

Risk Assessment Report Approved

Reviewed Risk Assessment for Tesoro. This RA is included in Appendix B of the Final Remedial Investigation Report, Alaska Railroad Corporation, Anchorage Terminal Reserve, ADEC File #2100.28.447. The RA indicates risks above benchmark criteria for construction workers via direct contact with groundwater, for site workers via the inhalation of indoor vapors at the pipeline control building, and for all receptors via the groundwater ingestion pathway. These exposure pathways will be addressed in the Feasibility Study. (Update added 1/11/12)

Bill O'Connell

3/16/2010

Document, Report, or Work plan Review - other

Reviewed Feasibility Study Report for Tesoro #1. The FS was conducted to satisfy the requirments of the EPA/ARRC AOC as this facility is on property owned by ARRC. The FS evaluated remedial options for several sub-areas of the facility including the Pipeline Alley, Northern Tank Farm (C-line plume), Southern Tank Farm and Truck Loading Rack, Ocean Dock Road, and the Pipeline Manifold Area. Alternatives considered at each site included No Action, Institutional Controls (ICs), and Monitored Natural Attenuation (MNA), except at the Pipeline Alley, where only No Action and MNA were considered. The recommended alternative site wide is ICs and MNA. The objective of ICs would be to control worker exposure during work activities and would include proper PPE, air monitoring, and engineering controls implemented using Tesoro's existing permitting process. While MNA would likely be very slow due to low groundwater flux and the presence of pavement, the risk of exposure is such that monitoring contaminant trends across the site would be an effective means of controlling future exposure to contaminants.

Bill O'Connell

4/27/2010

Document, Report, or Work plan Review - other

Reviewed 2009 Monitoring, Investigation, and Remediation Report for Tesoro #1. Activities conducted in 2009 included groundwater and surface water sampling, LNAPL recovery, and a soil-gas survey to evaluate vapor intrusion. Groundwater monitoring events were conducted in May and November 2009. During the May event, 29 wells were sampled for GRO and BTEX and during the November event, 18 wells were sampled. Additional analyses were conducted on groundwater samples from the November monitoring event including the full list of VOCs (8260B), SVOCs (8270D), EDB, and lead. Sitewide well gauging found measurable free product in 14 different wells ranging from 0.01 feet to 1.76 feet in thickness. Contaminant concentrations were generally stable across the site, with GRO detected up to 24.4 mg/l and benzene up to 13.0 mg/l in well PW-19B during the May sampling event, and DRO detected up to 37.9 mg/l in well MW-04 during the November event. VOCs (excluding BTEX) and SVOCs were not detected above Table C groundwater cleanup levels, however some analytes had detection limits above the Table C cleanup level. EDB and EDC were not detected. The dissolved-phase plume resulting from the C-pipeline release is migrating downgradient as evidenced by the increase of benzene concentrations in wells MW-21R and MW-22. Groundwater data indicate, and the report concludes, that the contaminants found in Monitoring well MWE17 are not from the Tesoro #1 facility and might be related to releases at other upgradient sites. A statistical evaluation of benzene data from several wells from 1998 to the present indicate a very slight decreasing trend, presumably due to the low natural attenuation rate at the site. The LNAPL plume resulting from the 2005/06 C-pipeline leak is considered stable, with approximately 5,600 gallons of product recovered in 2009 and 14,000 gallons of product recovered to date. Surface water samples were collected from the north and south manholes in the rerouted storm drain in May, June, and November 2009 and from upstream surface water sampling locations SW-2 and SW-4 in May and November. Samples from the north and south manholes and from sampling location SW-4 contained TAH and TAqH above Alaska Water Quality Standards, with TAH detected up to 32.9 ug/l and TAqH up to 34.5 mg/l both at the south manhole during the November event. Based on storm drain sample results, it appears that contaminated groundwater continues to infiltrate the storm drain upstream of the south manhole causing exceedances of AWQS. Soil gas sampling was conducted at the Operations Building and the Pipeline Office Building to support vapor intrusion analysis. Results show that hydrocarbon contamination in soil and groundwater at the site is not causing vapor intrusion into the buildings where sampling was conducted. Benzene was not detected in the samples, however trichlorofluoromethane was detected at concentrations resulting in a Hazard Index above the benchmark for some soil types. Additional investigation of the nature and extent of trichlorofluoromethane contamination is planned for 2010. A QA/QC review of data collected during these investigations indicates the data is valid for its intended purpose, except for the lead in groundwater data which was rejected.

Bill O'Connell

4/11/2011

Document, Report, or Work plan Review - other

Reviewed 2010 Monitoring and Remediation Report. Groundwater monitoring events were conducted on two occasions, once in May and once in September 2010. 23 monitoring wells were sampled during the May event and 10 wells were sampled during the September event. Benzene was detected up to 4.2 mg/l in well PW-19b, GRO was detected up to 6.6 mg/l in the same well, and DRO was detected up to 13.7 mg/l in well MW-04 in 2010. Contaminant concentrations were generally stable when compared with last year’s results. Product recovery from the 2005/06 C-Pipeline Release continued with approximately 1,700 gallon of product recovered in 2010 for a total of approximately 15,700 gallons recovered to date. Surface water samples were collected from the drainage along the west side of the tank farm and also from manholes along the buried portion of the storm drain. Data indicate storm water is impacted by hydrocarbons both from surface sources upstream of the facility and also from leakage of impacted groundwater from the facility into the storm drain. Surface water monitoring will continue until the impacts from Port Expansion activities are known, at which time the need for corrective action will be determined. 2011 activities will include continued monitoring and an evaluation of trichlorofluoromethane impacts to soil groundwater, and soil gas at the Pipeline Office.

Bill O'Connell

4/18/2011

Site Visit

Site visit to inspect storm drain outfall. No sheen was observed

Bill O'Connell

1/12/2012

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 71579 Bulk fuel tanks.

Bill O'Connell

5/24/2013

Document, Report, or Work plan Review - other

Reviewed 2012 Monitoring and Remediation Report for Tesoro #1. Twenty wells were sampled during the May event and 11 were sampled during the September event. In May, benzene was detected up to 3.50 mg/l and GRO was detected up to 3.85 mg/l, both in well PW-19b located near the pipeline warehouse. DRO was detected up to 12.7 mg/l in well MW-22 located on the far side of Ocean Dock road near Cook Inlet. Surface water sampling found benzene at 0.0486 mg/l along the upper reaches of the drainage ditch along the west side of the side. Benzene concentrations were reduced to 0.00098 mg/l further along the drainage where it enters the underground culvert, then increased again to 0.00592 mg/l in the manhole near the outfall. This suggests that contaminated groundwater is still infiltrating the storm drain, but not at concentrations above water quality standards. During the September event, benzene was detected up to 0.255 mg/l in well MW-04 (PW-19b was not sampled) located along the eastern edge of the site. GRO was detected up to 5.2 mg/l and DRO was detected up to 15.4 mg/l in this same well. Free product was noted in 8 wells up to 2.1 feet thick in MW-12 in May. The highest groundwater elevations to date were measured during the September event, essentially submerging the NAPL source areas and resulting in product thickness of 0.01 feet in 6 wells. Due to higher than usual groundwater elevations, the product recovery system recovered only negligible amounts of product so the system will continue to operate in 2013. To date, approximately 16,100 gallon of product have been recovered. The SVE system was not operated due to high water levels, but will be restarted if water levels fall in 2013.

Bill O'Connell

6/5/2013

Document, Report, or Work plan Review - other

Reviewed 2011 Monitoring and Remediation Report for Tesoro #1 received via email in may 2013. Sampling events were conducted in May and October 2011. 20 wells were sampled during the May event; benzene was detected up to 0.827 mg/l in well MW-25, GRO was detected up to 4.7 mg/l also in well MW-25 and DRO was detected up to 18.9 mg/l in well MW-04. 11 wells were sampled in October; benzene was detected up to 0.407 mg/l in well RW-PL, GRO was detected up to 3.96 mg/l in well MW-04 and DRO was detected up to 22.2 mg/l also in MW-04. Free product was found in 17 wells up to 1.714 feet thick in well MW-12. Most wells contained only minimal product at 0.01 feet thick. Surface water samples were collected from the drainage along the west side of the site. As in previous years, benzene was detected at its highest concentration, 0.05 mg/l, at the point where the drainage enters the property, is reduced to 0.067 mg/l where the drainage enters the underground culvert, then increases again at the manhole before daylighting into Cook Inlet. Samples from this manhole contained benzene at 0.00796 mg/l in the May sample and 0.0137 mg/l in the October sample. The SVE system operated as planned in 2011 and approximately 437 gallon of free product were recovered from the product recovery system.

Bill O'Connell

6/26/2014

Document, Report, or Work plan Review - other

Reviewed 2013 Monitoring and Remediation Report for Anchorage Terminal #1. Groundwater samples were collected from 18 wells at the site in May and/or September 2013. Benzene, GRO, and DRO were detected above cleanup levels in 12 of the wells with benzene detected up to 565 ug/l in well MW-25, GRO up to 6.65 mg/l in well MW-04 and DRO up to 29.8 mg/l, also in well MW-04. Sentinel wells MW-21R and MW-22 contained contaminants above cleanup levels with benzene detected up to 16.5 ug/l in MW-21R and DRO detected at 17.1 mg/l in MW-22. Surface water samples were collected from three established monitoring locations; one where the storm water ditch enters the Tesoro leasehold (SW-4), one where the ditch enters an underground culvert, and one in the manhole just upstream of the outfall. Each of these samples contained BTEX above Alaska Water Quality Standards due to the benzene concentrations. The LNAPL recovery system did not operate in 2013 due to high groundwater levels, which likely submerged the remaining LNAPL resulting in less recoverable LNAPL in the product recovery trench. High water levels also likely resulted in submerged well screens in the monitoring wells that were sampled, potentially biasing the samples low. The report indicates Tesoro will be proposing alternative cleanup levels and a groundwater use determination under 18 AAC 75.350 in 2014. Biannual groundwater and surface water monitoring will continue in order to monitor natural attenuation, storm water quality, and for leak detection purposes. The LNAPL recovery system will be maintained and restarted if/when water levels drop and LNAPL becomes recoverable.

Bill O'Connell

1/14/2015

Meeting or Teleconference Held

Meeting with Tesoro and consultant regarding Terminal 1 product recovery system status, rail rack rehab, and future sampling efforts

Bill O'Connell

5/19/2015

Document, Report, or Work plan Review - other

Reviewed 2014 Monitoring and Remediation Report for Tesoro Anchorage Terminal #1. Groundwater and surface water samples were collected on two occasions, once in June and again in October. Additionally, the presence of Freon-11 in previous soil vapor samples was investigated by collecting additional soil vapor, soil, and groundwater samples in the vicinity of the pipeline control building. The vacuum enhanced product recovery system in place to recover free product from the 2006 C Pipeline release did not operate in 2014 due to high groundwater levels, which led to a lack of recoverable product in the recovery system wells. Free product was identified in 5 wells during one or both monitoring vents, but at trace concentrations only, likely due to high groundwater levels. Contaminant concentrations in groundwater were generally stable in 2014 and consistent with previous data collected at the site. Benzene concentrations increased in MW-21r along the western edge of the site near Cook Inlet. Surface water sample data was also consistent with previous results. Surface water in the storm water ditch along the west side of the facility is contaminated with benzene when it meets Tesoro’s lease lot. Benzene concentrations appear to attenuate in the open portion of the ditch, but then it appears as though contaminated groundwater continues to infiltrate the storm drain as benzene concentrations increase again in the underground portion of the drain. A sample collected just up from the outfall exceeded TAH criteria due to the presence of benzene. Based on the data set for this site, Tesoro proposes sampling fewer wells in 2015. Monitoring wells PW-18, RW-PL, MW-20, MW-21R, and MW-30 will be sampled twice in 2015 and surface water samples will be collected from locations SW-2, SW-4, SW-5 and SDMH-N. The LNAPL recovery system will be operated if recoverable amounts of product are present in recovery wells and the SVE system will be operated if groundwater levels fall. A portion of the LNAPL recovery system is located on the former rail loading rack, which is proposed for improvements in 2015. If part of the system need to be decommissioned, a plan will be submitted providing details. Tesoro also proposes investigating the potential migration of contaminants to the west into the newly created South Backlands Area and further investigation of the migration of contaminated groundwater into the storm drain by conducting a camera inspection.

Bill O'Connell

6/13/2016

Document, Report, or Work plan Review - other

Reviewed Final 2016 Annual Report for Tesoro Terminal 1. Groundwater samples were collected from 5 monitoring wells in June and again in October 2015. Benzene was detected in each well above the cleanup level at concentrations ranging from 15.5 ug/l in MW-21r in October, to 505 ug/l in RW-PL in May. DRO was detected above the cleanup level at concentrations ranging from 2.31 mg/l in PW-18 in October to 40.6 mg/l in MW-21r in May. DRO was not detected above the cleanup level in RW-PL. Surface water sampling indicated petroleum contaminated surface water entering the site generally attenuates in the open portion of the storm drain ditch, but then benzene concentrations increase in the underground portion of the storm drain. Sampling indicates a steady increase in benzene concentrations, with a somewhat more marked increase approximately 40-80 feet from sampling location SW-5. A camera inspection of the storm drain did not reveal any obvious breaks, rather it is suspected that contaminated groundwater is slowly seeping into the drain along its entire underground course. The Vacuum-enhanced product recovery system did not operate again in 2015 due to high water level and minimal LNAPL in the recovery wells. The report indicates an LNAPL recovery system evaluation will be conducted in 2016 followed by a remedial alternatives evaluation, if warranted.

Bill O'Connell

5/23/2017

Document, Report, or Work plan Review - other

Reviewed May 8, 2017 Work Plan. Activities included routine groundwater sampling to monitor the dissolved phase plume, installation and sampling of MW-33 to replace MW-19 and MW-20, and surface water sampling associated with groundwater migration into the storm drain.

Wendy Hansen

11/6/2017

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 71579 Bulk fuel tanks.

Bill O'Connell

3/28/2018

350 Determination

A groundwater use determination under 18 AAC 75.350 has been issued for the Tesoro #1 tank farm at the Port of Anchorage based on the justification provided in the Revised 18 AAC 75.350 Groundwater use Determination Request, Anchorage Terminal 1, Port of Anchorage, Alaska dated January 8, 2018. This determination states that the shallow groundwater overlying the bootlegger cove clay formation is not a current or potential future source of drinking water.

Bill O'Connell

8/14/2018

Document, Report, or Work plan Review - other

The ADEC has reviewed the Supplemental Remedial Action Plan for Groundwater for Terminal 1, for the Tesoro #1 Port of Anchorage site (2100.38.311) and has no objections.

Chelsy Passmore

4/14/2021

Meeting or Teleconference Held

Annual meeting with Marathon/Tesoro, Trihydro, and DEC Project Managers to review monitoring results and activities reported in 2020 and discuss plans moving forward for 2021.

Jamie Grant

4/15/2021

Document, Report, or Work plan Review - other

Reviewed a 2020 Annual Groundwater Monitoring Report for Tesoro Terminal 1. Fluid levels in 42 wells were gauged and four monitoring wells (MW-30, MW-33, PW-18, and RW-PL) were sampled in the spring of 2020. Samples were analyzed for DRO and BTEX compounds. LNAPL was present and measured in MW-12 (0.37 ft) and MW-31 (0.56 ft); two wells that were located within the C-line release plume area. Overall, groundwater sampling results were similar to data from previous sampling events, with benzene and DRO concentrations slightly higher in 2020 than 2019 in some wells, but overall consistent with decreasing trends. Surface water samples were collected from the storm drain prior to the outfall (from manholes SW-2, SW-5, SDMH-N, and SDMH-S)and analyzed for TAH, GRO, and DRO . Surface water samples collected from the storm drain system exceeded the water quality standard for TAH (10 µg/L) at SW-5, SDMH-N, and SDMH-S. These results were higher than 2019, but generally lower than historical highs with the exception of SW-5 where TAH was 408.57 µg/L. This was primarily driven by the presence of Benzene (405 µg/L) in the sample, the source of which is unknown at this time. Samples were not collected at Terminal #1 in fall 2020 due to COVID-19 restrictions.

Jamie Grant

5/6/2021

Document, Report, or Work plan Review - other

Reviewed the Sampling and Analysis Plan for annual (2021) groundwater monitoring activities. The SAP was approved with the following condition: RP to modify sample collection method from bailer to one approved in the Field Sampling Guidance (ADEC, 2019) to prevent loss of volatiles.

Jamie Grant

4/6/2022

Document, Report, or Work plan Review - other

2021 Annual Groundwater Monitoring report, prepared by Tryhdyro, was submitted by the Tesoro Alaska Company. LNAPL was found in MW-12, MW-17, MW-26, and MW-31 during the June and October sampling events. These wells are within the C-Line plume release area at the northern portion of the site. Monitoring wells with benzene, ethylbenzene, and DRO above DEC groundwater cleanup levels was consistent with past results. One storm drain was also sampled (SDMH-S) and exceeded surface water standards for total aromatic hydrocarbons (TAH) in October. The other storm drain (SDMH-N) was not sampled due to trenchwork. Tesoro plans to sample using low flow methods and review historical data for compliance with current cleanup levels in next report. Report approved 6/8/22.

Janice Wiegers

4/25/2022

Update or Other Action

Notified by DEC's Prevention Preparedness and Response Program of a spill at Tank #9 (transmix tank) at the south end of Terminal 1. PetroStar now operates this terminal, but Marathon (formerly Tesoro) retains operational responsibility for tank #9 because if it tied into their other facility. Fuel spilled into secondary containment of Tank #8 last November, but product and sheen are visible in the stormwater ditch outside of containment now that snow is melting. Marathon is responding by using a vac truck to remove water for treatment, and preparing to sample stormwater before removing soil pile used to stop water flow in ditch. PPRP will also request soil sampling in ditch area where impacts were noted and sediments sampling in two downstream vaults. Soil/sediment removal may be necessary. Conversation with the POA on 4/26 indicated that the stormwater outfall from this area is not permitted under the Port's MS4 but will be in the future as Outfall 9.

Janice Wiegers

8/18/2022

Document, Report, or Work plan Review - other

Provided comments on "Revised Supplemental Remedial Action Plan for Groundwater Well Installation and Sulfate Injection" Sulfate, nitrates, bacteria, and nutrients are to be injected into the permeable reactive barrier. In addition 3 down-gradient wells will be installed.

Michael Hooper

9/20/2022

Document, Report, or Work plan Review - other

Approved Revised Supplemental Remedial Action Plan for Groundwater Well Installation and Sulfate Injection dated September 16, 2022. A nutrient/microbe blend will be injected into the PRB though 5 temporary points to ensure favorable conditions for contaminant breakdown.

Michael Hooper

6/6/2023

Document, Report, or Work plan Review - other

Reviewed Soil and Groundwater Management Report – Port of Alaska Modernization Program (2021 to 2022), dated December 2022 and submitted by BGES for work completed during Phase 2. Pacific Pile & Marine removed and tested soil near two contaminated sites: Port of Anchorage ABI Cement Terminal (Hazard ID 26258) in the southern portion of the project area and Tesoro #1 Port of Anchorage (Hazard ID 600) in the central portion of the project area. Approximately 1,309 cubic yards of obviously contaminated soil was treated at Alaska Soil Recycling. Another 4,448 cubic yards of potentially contaminated soil was stockpiled and then sent to the Anchorage landfill for disposal. Dewatering also took place in the central and southern project areas and temporarily held in weir tanks until sampling could be completed. Water was discharged to the Anchorage Wastewater Utility’s sanitary sewer system. DEC sent letter approving the report to Pacific Pile & Marine.

Janice Wiegers

10/10/2024

Long Term Monitoring Workplan or Report Review

Approved Monitoring report for Terminal 1. Trends in contaminant concentrations are similar to prior years.

Michael Hooper

Contaminant Information

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Level Description

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Comments

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Type

Details

Requirements

Description

Details

2020 Annual Report

2019 Annual Report

Groundwater Use Determination under 18 AAC 75.350

No associated sites were found.

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Alaska Department of Environmental Conservation

Site Report: Tesoro #1 Port of Anchorage

Site Chronology

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Documents

Associated Sites

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Action Information

Contaminant Information

Control Type

Requirements

2020 Annual Report

2019 Annual Report

Groundwater Use Determination under 18 AAC 75.350

Missing Location Data

State of Alaska Department of Environmental Conservation