GREGG S. STEPHENS, P.G.

**** ********** ****** * Aiken, South Carolina, 29803 * 770-***-**** Cell

ada4nu@r.postjobfree.com

HIGHLIGHTS OF QUALIFICATIONS

Gregg Stephens is a Senior Geologist for Navarro Engineering in Aiken, South Carolina. His responsibilities include oversight of the environmental staff, proposal preparation, annual cost projections and business development. Mr. Stephens has over 25 years of experience working with multidisciplinary, full service environmental engineering firms with focus on Emergency Response (ER) cleanups, subsurface investigation, remedial alternative evaluation and remedial system design/implementation. Mr. Stephens is RAD Worker II trained and has acted as the Technical Oversight//Health and Safety Officer of Radiological and Hazardous Waste site assessments. Mr. Stephens experience includes design and implementation of fixed and mobile Dual Phase Vacuum Extraction (DPVE), Multiple Pump Vacuum Extraction (MPVE), Pump & Treat (P&T), in-situ chemical oxidation (ISCO) technologies and soil vapor extraction/ air sparging (SVE/AS) systems.

REPRESENTATIVE SKILLS AND ACCOMPLISHMENTS

Department of Energy (DOE), Savannah River Site (SRS), Aiken, South Carolina. Technical Oversight/Health and Safety Officer for characterization activities at a former nuclear weapon fabrication facility. Specifically, Mr. Stephens is currently the TO/HSO at numerous investigations of Tritium, Cesium and TCE in soil and groundwater. Activities include stream assessment (flow and sample), monitoring wells and soil borings using sonic drilling to depths of up to 250 feet in a Radiological Area (RA). This work included Modified Level C Personal Protective Equipment (PPE).

Manufactured Gas Plant/Tampa Electric Company (TECO), Tampa, Florida. Senior Geologist for remediation of coal tar contamination at multiple Manufacture Gas Plant sites. Remedial effort included soil removal and dewatering/treatment of impacted groundwater. Project duration lasted 12 months resulting in issuance of a No Further Action from the Florida Department of Environmental Protection (FDEP).

Brownfield Assessment and Remediation, Georgia. Senior Geologist for assessment and remediation of numerous Brownfield sites to include remediation using chemical oxidation (Chemox) and In-situ soil/groundwater Dual Phase Extraction Systems.

Comprehensive Environmental Response, Compensation, and Liability Act - CERCLA (Superfund) / Landfill / Madison, Florida. Project Geologist and Field Operations Coordinator and field health and safety officer working with Region 4 EPA-Madison County Landfill, Madison, Florida. Supervised investigation activities including the installation of rock cluster monitoring wells in three different hydrologic zones, geologic mapping, advancement of landfill borings for waste characterization, multi-media sampling and seismic refraction to map the top of Karst bedrock for potential sinkholes. Wastes at the site included chlorinated solvents and heavy metals. Preparation of a remedial investigation (RI) report to include a feasibility study (FS) outlining a cost-effective remedial approach. Remedial approach included decommissioning nearby residential water wells and conversion to county water supply. The landfill was capped and was later removed from the National Priority List (NPL).

Resource Conservation and Recovery Act (RCRA) / Government Client/ Key West, Florida. Project Geologist and field health and safety officer for RCRA facilities operated by the U.S. Navy Facilities Engineering Command, Southern Division in Key West, Florida. Responsibilities include preparation and implementation of RFI work plans for ten Solid Waste Management Units (SWMUs); regulatory liaison and negotiations, preparation and supervision of field activities; preparation and submittal RFI report. RFI involved evaluation of presence and extent of LNAPLs, PAH’s, metals, and pesticides and PCBs on various Naval Base keys surrounding Key West.

RCRA Facility Consent Order/Former Dry-Cleaning Site/Milledgeville, Ga. Project Geologist for assessment and remediation of a former dry-cleaning facility regulated under a consent order with EPD’s RCRA program. Design and implementation of a chemical oxidation (Chemox) injection plan, using Potassium Permanganate in soil, and a Dual Phase Extraction System, to reduce perchloroethylene concentrations in groundwater.

RCRA / Government Client/ Fort Rucker, Al. Senior Geologist field health and safety officer for RCRA facility operated by the U.S. Army. Responsibilities include preparation and implementation of RFI work GREGG S. STEPHENS, P.G.

5080 Nokesville Circle * Aiken, South Carolina, 29803 * 770-***-**** Cell ada4nu@r.postjobfree.com

plans for two SWMUs; regulatory liaison and negotiations, supervision of field activities; preparation and submittal RFI report. The RFI involved geophysical delineation of SWMUs, evaluation of presence and extent of LNAPLs, PAH’s, metals, pesticides and PCBs in soil and groundwater.

Due Diligence / Petroleum Distributor. Managed and supervised performance of Due Diligence Investigations, as part of a $75-million-dollar acquisition, of 150-petroleum retail stores in Florida, Georgia, Alabama, North Carolina and South Carolina. Coordination of field crew and six drill rigs to install direct push points at 150 retail facilities. Provide written report for 150 petroleum retail facilities within 3 months of initiation. The environmental reports included regulatory compliance history, current soil and groundwater data and recommendations for purchase to include probable cost of remediation.

Storm Water Management/Bulk Petroleum Facilities-Performance of over 40 Spill Prevention, Control and Countermeasure (SPCC) Plans as specified in 40 CFR Part 112. Performance of field investigation and records review to include types, location and size of petroleum storage tanks, acceptable secondary containment, methods of spill control and countermeasure and pathways to sensitive receptors.

Tank Management/Commercial Shopping Mall/Hartwell, Ga. Managed and supervised assessment and remediation of a retail petroleum facility before impacting a surface water body located within 400 feet from the site. Free product was removed using mobile Dual Phase Vacuum Extraction (DPVE). In combination with the DPVE, surfactant injection was used to break down the interstitial tension between the free product and soil particles. Fate and transport groundwater modeling was performed to calculate ACLs for benzene in groundwater that would not impact the receptor. To achieve the dissolved benzene ACL, injection of sodium persulfate, activated with sodium hydroxide, was used to reduce the high levels of dissolved benzene in source area. The chemical oxidant (Chemox) was injected through DPT points placed in a grid pattern, to maximize the coverage of the dissolved plume. Active remediation via mobile DPVE/surfactant injection and Chemox took 24 months. A No Further Action status from the Georgia EPD was received after 12 months of groundwater monitoring to validate the fate and transport model.

Tank Management/Retail Petroleum Station/Augusta, Ga. Managed and supervised assessment and remediation of a retail petroleum facility before impacting a surface water body that flows through the Augusta National Golf Course (Masters Tournament). The petroleum release to groundwater resulted in over three feet of gasoline free product and high levels of dissolved benzene, in a fractured bedrock aquifer, flowing toward Raes Creek located 150 feet down gradient. Further receptors included 6 privately owned drinking water wells within -mile of the site. Initial free product recovery and pilot testing was performed using five mobile DPVE events. A fixed DPVE system was installed with extraction wells screened to isolate

(using packers) specific zones in the overburden and fractured rock. Fate and transport groundwater modeling and a mixing zone dilution model was performed to calculate ACLs for benzene in groundwater. Active remediation took 18 months and a No Further Action status was received from the Georgia EPD after 18 months of monitoring natural attenuation. Successful remediation of the site and protection of the receptor was completed within three years of inception.

Tank Management / Petroleum Distributor / Tennessee, Georgia and South Carolina. Managed and supervised the assessment and remediation of soil and groundwater for over 200 petroleum retail facilities for major petroleum distributing companies in Georgia, Alabama, South Carolina, North Carolina, Tennessee and Florida. Also acted as field health and safety officer.

State Superfund Sites / Florida. Managed and supervised over 20 Preliminary Contamination Assessments

(PCA) working closely with the Florida Department of Environmental Protection to delineate the vertical and horizontal extent of perchloroethylene in the soil and groundwater matrix at dry cleaning facilities. These projects utilized matrix field screening, via hydraulic direct-push drilling and sample analysis via mobile gas chromatograph (GC). This method of soil and groundwater field screening reduced project cost and duration.

Hydrogeologic Investigations / Various Clients. Managed and performed numerous comprehensive hydrogeologic investigations to include fate and transport groundwater modeling and hydraulic conductivity

(pump/bail down/tidal) tests. These projects determined the potential impact to human health and the environment and evaluated possible remedial alternatives. GREGG S. STEPHENS, P.G.

5080 Nokesville Circle * Aiken, South Carolina, 29803 * 770-***-**** Cell ada4nu@r.postjobfree.com

EDUCATION

B.A., Geology, The Ohio State University; 1990, including Graduate Studies in Hydrogeology and Paleontology. A.S., Mining Engineering, Union College, Kentucky, 1986. CERTIFICATES & REGISTRATIONS

Professional Geologist - Tennessee, License No. 5171 Professional Geologist – North Carolina, License No. 2526 Professional Geologist - Georgia, License No. 1421 Professional Geologist - Florida, License No. 1844 Professional Geologist –South Carolina, License No. 2329 Professional Geologist - Alabama, License No. 140, Radiation Worker II Training-January 2018

Project Management Training Course, IT Corporation, 1990 Applied Groundwater Fate and Transport Modeling using Bioscreen, The Environmental Institute, October 1999 Groundwater Modeling/Management Training Series, IT Corporation, 1990 40 Hour OSHA Health and Safety Training (29 CFR 1910) 8 Hour OSHA Supervisor Health and Safety Training (29 CFR 1910) OSHA Confined Space Certification

On-site Supervisor for Cathodic Protection Installation, Georgia EPD USTMP, Certificate #023-3/98 ARMED SERVICE

1982 - 1993 Section Sergeant and Army National Guard (Kentucky, Ohio and Scout/Forward Observer (13F) Florida). Honorable Discharge-1993. 1990-1991 Operation Desert Shield/Storm Kuwait and Saudi Arabia 1993 Graduate NCO Academy United States Army

Primary Leadership Development Course Fort Benning Georgia. DECORATIONS

Army Commendation Medal Kentucky Commendation Ribbon Kuwait Liberation Medal Florida Guard Commendation Medal Army Service Ribbon Florida Service Medal

Army Reserve Components Achievement Medal Ohio National Guard Faithful Service Ribbon Ohio National Guard Award of Merit Ribbon NCO Professional Development Ribbon Southwest Asia Service Medal National Defense Service Medal EMPLOYMENT HISTORY

2017-Present Senior Geologist Navarro Research & Engineering -Chattanooga, TN 2016-2017 Senior Geologist Atwell, LLC. -Atlanta, Georgia 2015-2016 Senior Geologist Cardno, Inc.-Atlanta, Georgia 2009-2015 Principal Geologist The Louis Berger Group-Roswell, GA. 1992 -2009 Geologist ATC Associates Inc., (Former ATEC), GA/FL. 1990 - 1992 Staff Geologist International Technology, Inc., Tampa, FL.