Remedy Contingencies

DEC regulatory oversight will ensure that the goals of the ROCP continue to be met, and Flint Hills is prepared to resume active treatment, if needed. If monitoring shows that any contaminant is likely to migrate off the refinery property above levels permitted under this Plan, FHRA will confer with DEC to consider additional actions, including resum-ing operation of the onsite groundwater pump and treat system, or other options that may be appropriate. See page 3 for groundwater remedy contingency details.

The purpose of the Revised Onsite Cleanup Plan (ROCP) and the Offsite Potable Water Plan is to continue to protect people from contamination associated with the former North Pole Refinery.

• On the property, people are protected by land use controls that prevent exposure to contamination (see page 3).

• Off the property, residents are currently protected from exposure to sulfolane in drinking water by alternate water supplies. With the extension of the piped water to affected properties, residents will be assured of permanent protection from sulfolane in drinking water (see page 3).

The terms of the Revised Onsite Cleanup Plan include:

• Revision of the groundwater remedy (see Remedy discus-sion to right).

• A management plan in place to protect people from soil contamination remaining on the property after contaminated soil excavations performed under the 2014 Plan.

• Continued groundwater monitor-ing both on and off the former refinery property (see page 2).

The 2017 Revised Onsite Cleanup Plan &Offsite Potable Water Plan

Purpose

Under the Revised Onsite Cleanup Plan (ROCP), operation of the onsite groundwater recovery and treatment system is being phased out. Active pumping will be replaced by intensive groundwater monitoring. Contingen-cies are in place to resume active treatment if the Plan goals are not met.

The groundwater recovery and treatment system has greatly reduced the amount of sulfolane migrating off the former refinery property since it was upgraded between 2011 and 2014. The system was initially operated in the late 1980s to treat spilled petroleum and upgraded in response to the 2009 discovery of sulfolane off the refinery property. Petroleum has never been shown to migrate off the property. Over the years, the treatment system has removed almost 400,000 gallons of fuel and many pounds of dissolved petroleum constituents and sulfolane.

Shutting down the treatment system is considered appropriate for the following reasons:

• Residents will be protected from exposure to sulfolane in drinking water by the piped water system expansion.

• Although some sulfolane is antici-pated to migrate off the terminal property once the system has been shut down, it is not expected to significantly change the extent of the offsite plume.

• Petroleum contamination is not

Groundwater RemedyOntheFormerRefineryProperty

anticipated to migrate off the terminal property.

• Dissolved contamination on the former refinery is decreasing. Most of the petroleum and sulfolane was spilled a long time ago, and much has been removed.

The updated groundwater goal is to prevent contaminant migration off the refinery property above DEC cleanup levels. For sulfolane, offsite migration is not to exceed a concentration of 400 parts per billion. This is not a cleanup level, but is a level based on monitoring and modeling by Flint Hills Resources Alas-ka (FHRA). This amount of sulfolane, which is expected to decrease over time, should not significantly impact the offsite plume.

February 2017

A component of the Settlement Agreement between Flint Hills Resources Alaska, the State of Alaska, and the City of North Pole

2

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0 360 720

SCALE IN FEET

FLINT HILLS RESOURCES ALASKA, LLCNORTH POLE TERMINAL, NORTH POLE, ALASKA

ONSITE MONITORING PLANFIGURE

1

REVISED ONSITE CLEANUP PLAN FACT SHEETLegend

Approximate Area Sulfolane PlumeApproximate Area Benzene PlumeFHRA Property BoundaryGAC West and East Groundwater Remediation and Treatment System Piping

&< Monitoring Well!( Observation Well!H Recovery Well

NOTES:ND = Not Detected- Contours are generally based on fourth quarter 2016 results and include some historical data where a fourth quarter sample was not collected .- Only long-term monitoring locations for Sulfolane, Benzene, Toluene , Ethylbenzene, and Xylenes (BTEX) and Natural Source Zone Depletion (NSZD) are currently shown on this figure. Additional wells exist onsite and will b e monitored for other purposes.- Image provided courtesy of Pictometry International 2012.

February 2017

OntheFormerRefineryProperty: Monitoring and Reporting Summary

Intensive monitoring will evaluate the impact of turning off the onsite ground-water treatment system. The main goal of the monitoring is to ensure that contamination in groundwater is not migrating off the former refinery above

levels allowed in the plan.

The monitoring will also evaluate how fast the contamination is decreasing in the source areas and how much con-tamination may rebound in the former

treatment zone after system shutdown.

Samples will be collected from ground-water monitoring wells located through-out the refinery to accomplish these goals (see map below).

3

The Alaska Department of Environmental Conservation

is accepting remarks on the 2017 Revised Onsite Cleanup and the

Offsite Potable Water Plan until

5 p.m. on March 27, 2017

Please provide your remarks at the Open House on February 25th or Send them to:

Jim Fish Environmental Program Specialist and Project ManagerADEC Contaminated Sites Program 610 University Dr., Fairbanks, AK 99709 james.fish@alaska.gov

February 2017

OntheFormerRefineryProperty:

Groundwater Remedy Contingency Details

An Equitable Servitude is in place for the property which:

• Limits the property use to industrial.• Prohibits use of groundwater for

drinking water purposes.• Uses fencing to restrict the general

public’s access to the property.• Requires protective measures:

○ For excavation of soil in the defined contamination area.

○ To limit potential exposure to vapors inside buildings on the property.

• Places protective requirements on construction of new buildings on the property.

Land Use Controls to Protect People on

the Terminal Property

We Want Your Feedback

FHRA will provide a Short Term Monitoring Evaluation after one year of intensive monitoring to compare results to pre-shutdown expectations and determine if any contingencies are needed.

FHRA will also prepare detailed reviews of contamination on the former refinery after five and ten years of monitoring. The need for continued monitoring will be re-evaluated after ten years.

The Revised Onsite Cleanup Plan (ROCP) includes routine monitoring at locations 300-600 feet before the property boundary. If levels of sulfo-lane are detected in these strategically located wells above 400 ppb, the onsite cleanup plan requires more intensive monitoring to evaluate if additional remediation actions need to be implemented.

These actions could include activities such as injecting air into the subsurface or pumping groundwater to reduce the groundwater concentrations before they leave the property.

The ROCP includes similar contingen-cies for hydrocarbons that remain on the property.

Monitoring, Continued from Page 2

Monitoring will track the migrating sulfolane plume to ensure protection of residents.

To meet this goal, groundwater samples will be collected from monitoring wells and private wells in the portion of the plume that is actively migrating (“the leading edge”). Monitoring will especially target the boundaries of the expanded piped water area to

OfftheFormerRefineryProperty: Monitoring and Reporting Summary

safeguard properties outside the expanded piped water area from impact due to possible undetected sulfolane plume migration.

If monitoring suggests that the plume may soon impact properties outside the expanded piped water area above a safe level, appropriate protective measures will be taken. These measures may include additional private well monitoring and provision of interim

alternate water supplies, if appropriate.

Monitoring will also evaluate the impact that shutdown of the onsite groundwater treatment system has on the offsite plume. Samples will be col-lected from selected locations through-out the plume to accomplish these goals (see map on back page).

Annual reports will be prepared to docu-ment the off-property monitoring results. Detailed reviews of contamination off the former refinery will also be prepared after five and ten years of monitoring.

City of North Pole Bill Butler, Director of City Services, (907) 488-8593

Flint Hills Resources Groundwater Office(907) 488-0723

DEC, Spill Prevention and Response Division, Contaminated Sites ProgramJim Fish, Project Manager (907) 451-2117, james.fish@alaska.gov

www.dec.alaska.gov/spar/csp/sites/north-pole-refinery

Project Contacts

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MW-152A-1517.2

MW-151B-2514.8

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MW-172A-15<5.00

MW-194B-4035.1

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MW-157B-3019.7

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MW-170D-50<5.10

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MW-347-209.33J

MW-341-4028.0

MW-350-15<5.00

MW-329-1533.6

MW-163B-408.47J

MW-150B-2522.9

MW-182B-4529.5

MW-346-1514.0

MW-332-41<5.10

MW-164B-5041.3

MW-161A-1540.8

MW-157A-1512.9

MW-170A-15<5.10

MW-168B-5042.5

MW-153B-553.69J

MW-328-151<5.05

MW-193B-60<5.05

MW-160AR-15<5.05

MW-338-15<5.05

MW-185A-15<5.15

MW-346-1503.22J

MW-316-56<5.05

MW-181B-50<5.00

MW-343-15<4.73

MW-349-4517.1

MW-342-1512.7

MW-357-65<5.15

MW-428-15<5.10

MW-346-6536.9

MW-323-50<5.10

MW-332-11013.5

MW-185B-506.55J

MW-185C-1205.09J

MW-184-45<5.05

MW-340-18<5.10

MW-169A-15<4.76

MW-266A-1512.6

MW-164A-1523.0

MW-167A-153.32J

MW-150A-1087.7

MW-339-1523.6

MW-350-5017.8

MW-155B-65<5.10

MW-190-150<5.15

MW-183A-154.63J

MW-156B-5013.8

MW-181A-15<5.10

MW-314-15<5.00

MW-158A-1522.1

MW-322-15<5.05

MW-162A-1515.8

MW-160B-908.67J

MW-323-15<5.20

MW-332-150128

MW-322-150<5.10J*

MW-150C-605.81J

MW-159A-15<5.15

MW-316-15<5.05

MW-170C-130<5.20

MW-181C-150<5.05

MW-161-3060.1

MW-190BR-60<5.20

MW-349-1521.5

MW-169C-60<5.10

MW-165A-15<5.10

MW-317-15<4.94

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MW-167B-3515.5

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MW-152B-2513.8

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MW-151A-1523.9

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MW-194A-1514.9

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MW-190A-15<5.05

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MW-155A-1511.9

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MW-356-20<5.00

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ND

PF-2 PF-1

PF-3

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OLD RICHARDSON HIGHWAY

CITY: HIGHLANDS RANCH, CO DIV/GROUP: ENV/IM DB: BGRIFFITH LD: G FRANCE PATH: Z:\GISPROJECTS\_ENV\FHR_AK\NORTHPOLEREFINERY\GW_MONITORING\2016_Q3\MXD\2016SECONDSEMIANNUALOFFSITE\FIG 3-5 APPEXTENTSULFOLANEIMPACTSOFFSITEMWPW.MXD DATE: 11/18/2016 TIME: 5:47:38 PM

0 2,500 5,000

SCALE IN FEET

FLINT HILLS RESOURCES ALASKA, LLCNORTH POLE TERMINAL, NORTH POLE, ALASKA

THIRD QUARTER 2016 APPROXIMATE EXTENT OF SULFOLANE IMPACTS IN OFFSITE MONITORING WELLS

AND PRIVATE WELLS FIGURE

3-5

SECOND SEMIANNUAL 2016 OFFSITEGROUNDWATER MONITORING REPORT

Notes:ND = Not DetectedJ = Estimated concentration, detected above the detection limit (DL) and below the limit of quantitation (LOQ)J* = Result is considered an estimate, no bias; flag applied by Shannon Wilson, Inc. basedon analytical quality control issuesµg/L = micrograms per liter-PW-1230 has been plotted offset from the exact location for clarity.-Private wells regardless of depth that are sampled within the last 12 months (September 13, 2015 through September 13, 2016) are displayed with color coding that is based on concentration from the most recent sampling event. -Monitoring well sample results shown here are from July and August 2016. -Contours are generally based on third quarter 2016 results. Contours include some historical data where a third quarter 2016 sample had not been collected.-The ND contour on this figure may be different from the individual suprapermafrost and subpermafrost ND contours, due to detections in private wells not designated as either suprapermafrost and subpermafrost. -The lower end of the yellow color coding range is based on the method detection limit.-Image provided courtesy of Pictometry International 2012

Legend!< Monitoring Well

0!* Point-of-entry treatment system sample collected

* Private Well

Approximate Sulfolane Isopleth Regardless of Depth in µg/L

GF Permafrost Boring

FHRA Property Boundary

Private Well Sulfolane Results Monitoring Well Sulfolane Results

Initial Result from Third Quarter 2016!

Inferred Suprapermafrost and Subpermafrost Mixing Zone

1.0 - 100 µg/L 3.1 - 100 µg/L

104<

Sulfolane Concentration (µg/L)Not detected: detection limit listed

MW-353-15 Monitoring Well Location ID

Not Detected

100 - 200 µg/L#*

200 - 300 µg/L300 - 400 µg/L

Greater than 400 µg/L

#*

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100 - 200 µg/L!(!(

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