Overview 1

PERFORMANCE-BASEDOBJECTIVES ACHIEVEDAT SCOTTAFBCASE STUDY:PetroFix Reduces BenzeneLevels to Non-Detect

2 Overview

OverviewCorrec�ve Ac�on Plan (CAP)Proposed Direct Push Injec�on UsingCombined RemedySco� Air Force Base (AFB) is a large military base located in SouthwesternIllinois spanning 3.7 square miles of U.S. government owned land. The site'spetroleum impacted soil was a result of a removal of underground piping in1993, as well as two large underground storage tanks (USTs), one of whichhad previously been used to store gasoline. Groundwater samples taken onsite indicated that BTEX was above the groundwater remedia�on objec�ves.As a result, remedia�on of this area was necessary. Addi�onal wellinstalla�on and delinea�on occurred from 2004 to 2009.

The site underwent long-term monitoring in accordance with IllinoisEnvironmental Protec�on Agency (EPA) Leaking Underground Storage Tank(LUST) program requirements star�ng in 2010.

The final Correc�ve Ac�on Plan (CAP) Addendum proposed two rounds ofgroundwater treatment by injec�on at Former Tank 85 to reduce benzeneconcentra�ons below the groundwater remedia�on objec�ves. The firstround of injec�ons was completed in February through March 2018 andconsisted of the use of REGENESIS’ RegenOx®, coupled withORC Advanced® (ORC-A) to s�mulate aerobic bioremedia�on.

The ini�al injec�on was successful in reducing most contaminants within theaffected area. The second round of injec�on at the former UST wascompleted in March 2019 using REGENESIS’ PetroFix™ micron-scaleremedial fluid. Groundwater injec�on ac�vi�es for the second round werecompleted via 24 injec�on points, injec�ng PetroFix from an interval of 7 to14 feet below ground surface (bgs) using a 3-foot deployable mul�-portinjec�on screen. PetroFix included the recommended electron acceptoramendment using both nitrate and sulfate to s�mulate sorb�on of thebenzene mass.

One month following the applica�on event, contaminant levels reachednon-detect. Benzene con�nued to remain non-detect for another 5 samplingevents through March 2020 and the site was recommended for no-further-ac�on (NFA).

Impacted soil was caused by leakingunderground piping and removal oftwo large UST's

Second round of direct pushinjec�on included PetroFix to treatlingering BTEX

One month following applica�on ofPetroFix, BTEX levels were at non-detect and have con�nued to remainat that level for 5 sampling events

Background and Timeline 3

BackgroundUniquely Challenging Site Condi�onsThe treatment site is a former Air Force Base, located in St. Clair County inSouthwestern Illinois, 25 miles southeast of St. Louis, Missouri. Following theexcava�on of all underground piping and two large underground storagetanks, groundwater samples indicated BTEX contamina�on was at a levelexceeding groundwater remedia�on objec�ves. From 2004-2009, the siteunderwent long-term monitoring in accordance with EPA and LUST programrequirements. Ini�al remedia�on strategies at the site were successful inmass reduc�on of all contaminants except benzene. Following theapplica�on of PetroFix micron-scale remedial fluid, Sco� AFB has beenrecommended for no-further-ac�on (NFA) status.

TimelinePetroFix Reduces Benzene Levels toNon-Detect

2004-2009Well installa�ons take place and delinea�ons applied

1993Ini�al contamina�on occurs as a result of onsite pipeline, two USTsare removed

2010Site is monitored for contamina�on levels

2017Completed benzene delinea�on via direct push groundwater sampling

February 2018First applica�on using combined remedy of RegenOx and ORC-Advancedapplied

March 2019PetroFix applica�on occurs to treat remaining contaminants

March 2020Site con�nues to be at non-detect following 5 monitoring events and hasbeen recommended for NFA status

TreatmentEffec�ve Treatment Using a CombinedRemedy Approach Achieves Non-Detect

The first round of injec�ons were completed in February through March2018 and consisted of the use of REGENESIS’ sodium percarbonate basedoxidant, RegenOx, coupled with Oxygen Release Compound (ORC-A)technology to s�mulate aerobic bioremedia�on.

The second round of REGENESIS injec�ons were completed in March 2019and used PetroFix to treat lingering contamina�on. PetroFix included therecommended electron acceptor amendment using both nitrate and sulfateto s�mulate anaerobic biodegrada�on of sorbed benzene mass.Groundwater injec�on ac�vi�es for the second round were completed via24 injec�on points and involved applying PetroFix from an interval of 7 to14 feet below ground surface using a 3-foot deployable mul�-port injec�onscreen. During the injec�on, PetroFix was observed in the monitoring wellwhich confirmed its distribu�on in the subsurface. The well wassubsequently flushed post-injec�on to remove any lingering injec�onmicron-scale material.

3-foot deployable mul�-port injec�onscreen used to apply PetroFix

4 Overview4 Treatment

Results 5Overview 5

ResultsPetroFix Successfully Treats LingeringContaminants

The remedial approach u�lized by REGENESIS successfully treated thelingering contamina�on. The ini�al combina�on of RegenOx andORC Advanced, coupled with the secondary measure of PetroFix hasprovided the contaminant mass reduc�on needed. The site is currently inplace to receive a 'No Further Ac�on' status following 5 sampling events atnon-detect .

PetroFix achievednon-detectimmediately a�erinjec�on

Groundwater Remedia�on Objec�ve Benzene Concentra�on

Benzene Concentra�ons in ST10-MW8501

BenzeneCo

ncentra�on

sµg

/L

Date Sampled

0

20

40

60

80

100

120

140

4/13 4/14 4/15 4/16 4/17 4/18 4/19 4/20

TechnologyPetroFix, RegenOx, and ORC-Advanced

PetroFix has a dual func�on: it removes hydrocarbons from the dissolvedphase by adsorbing them on to ac�vated carbon par�cles and thens�mulates hydrocarbon biodegrada�on by adding electron acceptors.PetroFix is a highly concentrated water-based suspension consis�ng ofmicron-scale ac�vated carbon and bios�mula�ng electron acceptors. Theenvironmentally-compa�ble formula�on of micron-scale ac�vated carbon (1-2 microns) is combined with both slow and quick-release inorganic electronacceptors. Prac��oners can select between a sulfate and nitratecombina�on blend (recommended) or sulfate only for the addi�onal electronacceptors required.

RegenOx in situ chemical oxida�on (ISCO) directly oxidizes contaminantswhile its unique cataly�c component generates a range of highly oxidizingfree radicals that rapidly and effec�vely destroy a range of targetcontaminants including both petroleum hydrocarbons and chlorinatedcompounds. RegenOx is an injectable, two-part ISCO reagent that combinesa solid sodium percarbonate based alkaline oxidant (Part A), with a liquidmixture of sodium silicates, silica gel and ferrous sulfate (Part B), resul�ng ina powerful contaminant destroying technology.

ORC Advanced® is an engineered, oxygen release compound designedspecifically for enhanced, in situ aerobic bioremedia�on of petroleumhydrocarbons in groundwater and saturated soils. Upon contact withgroundwater, this calcium oxy-hydroxide based material becomes hydratedproducing a controlled-release of molecular oxygen (17% by weight) forperiods of up to 12 months on a single applica�on. Oxygen is required bymicroorganisms to transform organic contaminants (such as petroleumhydrocarbons) into carbon dioxide, water and microbial cell mass. Moreimportantly, the new and readily available oxygen produced byORC Advanced accelerates aerobic biodegrada�on processes up to 100�mes faster than natural degrada�on rates. ORC Advanced providesremedia�on prac��oners with a significantly faster and highly effec�vemeans of trea�ng petroleum contaminated sites.

6 Technology

The ConsultantAbout AECOM

About the Project ManagerBen Christensen, PE

AECOM’s environmental services help industrial and public sector clientsaround the world balance growth with resiliency — achieving compliance andreducing, or elimina�ng, risks while protec�ng our natural environment.

AECOM works closely with clients and communi�es to solve the mostcomplex environmental challenges throughout the business life cycle: assetdevelopment, opera�ons op�miza�on, integrated products, and restora�onand reuse. Our core value of Safety underpins all our work.

Mr. Christensen is a Project Manager at AECOM and has managedremedia�on projects for Department of Defense (DoD) facili�es in Illinois,Nebraska, and Nevada. Mr. Christensen is a Professional Engineer (PE) inmul�ple states with 14 years of experience preparing and implemen�ngremedial designs at various Hazardous, Toxic and Radioac�ve Waste (HTRW)sites. His specific experience includes implemen�ng groundwater and soilremedia�on by in-situ chemical and bio-remedia�on injec�ons, groundwaterpump and treat systems, soil-vapor extrac�on (SVE) systems, bioven�ng, andexcava�on for Performance-Based Remedia�on (PBR) contracts.

About AECOM 7

8 Overview

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