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Updates from the field A brief look at a few of our recent projects Spring 18

CELEBR TING YEARS 30 1987 2000 Two Phase II SBIR Proposals are funded Wisconsin awards Infrasense statewide GPR deck evaluation project Infrasense business plan presented by Founder Ken Maser at MIT Enterprise Forum early Shark Tank Infrasense incorporates in December 1987 1990 First state bridge deck project with NHDOT First state pavement projects with TexDOT TTI and KDOT KU Pavement Consultants PPC of Denmark 1993 Infrasense conducts road surveys in Germany with Phonix Pavement Consultants PPC of Denmark Infrasense wins FHWA award to develop method to detect unknown bridge foundations First Infrasense IR deck application Commodore Barry Bridge near Philadelphia First newsletter published Florida Statewide pavement survey conducted with TTI SHRP2 Pavement Delamination project initiated GPRQA software delivered to Florida DOT for automated pavement density mapping 2010 Tunnel surveys in Norfolk Maine TPK Post tension evaluation in Bath ME 2003 Tappan Zee Bridge 3 miles 1 3M sq ft surveyed Largest deck surveyed to date 2014 2005 2017 New Orleans pavement surveyed to identify flood damage from Katrina with Fugro 2007 First WisDOT GPR IR Project 1996 2009 Infrasense celebrates 20th Anniversary Adam Carmichael named President of Infrasense Infrasense celebrates 30th anniversary INFRASENSE is an engineering consulting firm that specializes in the non destructive evaluation NDE of bridge decks highway and airfield pavements tunnels parking structures and other transportation facilities The company was founded in 1987 with support from National Science Foundation NSF Small Business Innovative Research SBIR Grants 2017 marked Infrasense s 30th year in business providing NDE consulting and testing services using ground penetrating radar GPR infrared thermography IR seismic vibrations impact echo ultrasonic testing imaging and image processing In honor of this achievement Infrasense founder Dr Ken Maser took some time to reflect on the past 3 decades during which Infrasense completed hundreds of projects across all fifty states and around the globe and highlight some notable moments in our company history Infrasense enjoyed another busy year in 2017 scanning over 300 bridge decks and over 3400 miles of pavement and performing nondestructive testing on a range of other structures from tunnels in Virginia to floor slabs in Massachusetts We also expanded our team adding two full time engineers a part time analyst and a parttime office assistant who hit the ground running and contributed to the myriad of projects we completed this year The following pages showcase a few of our most notable projects from 2017

Roadway Structure and Condition Evaluations in Idaho Transportation Department s District 5 6 Idaho Infrasense completed surveys on the remaining 363 miles of state highways in the Idaho Transportation Department s District 6 and performed pavement condition evaluations on Interstate 86 in District 5 Total Pavement 363 Total decks 23 Total Area s f 121 800 Infrasense continued its roadway structure evaluations in Idaho in 2017 collecting Ground Penetrating Radar GPR for over 340 miles of pavement along state highways in Idaho Transportation Department s District 6 This year s GPR data along with Traffic Speed Deflectometer TSD data collected by ARRB Group and analyzed by Nichols Consulting Engineers NCE was combined into the existing geodatabase along with calculated remaining life structural number subgrade modulus and pavement thickness values Infrasense also performed condition evaluations on the 23 bridge decks located on the pavement testing routes using GPR and Infrared Thermography IR The results of this multi year project are publicly available on Idaho s IPLAN a web based collaborative information site that spatially displays data IPLAN provides ITD personnel with easy access to the data and a simple and visual means to display the data In order to quantify the benefit of incorporating pavement structure information into ITD s pavement management system The Kercher Group ran a 50 year life cycle simulation which showed cost savings of over 15MM In addition to the District 6 pavement structure evaluations Infrasense performed a condition evaluation of over 20 miles of concrete pavement on Interstate 86 in Idaho Transportation Department s District 5 using a combination of GPR IR and High Resolution Visual HRV data Concrete panels with significant cracking and deterioration were identified for repair or replacement based on a set of condition criteria set forth by ITD www infrasense com

Multi Phase Condition Evaluation of Hampton Roads Tunnel Virginia Total tunnel wall area s f 452 000 Total tunnel deck area s f 362 200 Total number of IE locations 364 The Virginia Department of Transportation commissioned Infrasense to perform condition evaluations of the walls and roadway deck of the Hampton Roads Tunnels which carry I 64 below the Chesapeake Bay in Norfolk Virginia The eastbound and westbound tunnels are 7 315 feet and 7 470 feet in length respectively The tunnel wall evaluations were carried out using a 2 phased approach Phase 1 included rapid scanning of the tunnel walls using high resolution visual HRV and infrared thermography IR and Phase 2 consisted of targeted acoustic impact echo and hammer sounding and handheld ground penetrating radar GPR testing on selected tunnel wall locations The infrared and highresolution visual data were collected simultaneously in a series of passes at approximately 35 mph with synchronous distance data using a high precision wheelmounted encoder The data was collected during the setup and breakdown of unrelated roadwork closures to prevent any additional disruptions to tunnel traffic Using Infrasense s proprietary software the infrared and visual data was then stitched into composite images of the full extents of the tunnel walls and potential areas of deterioration or damaged tiles were identified and mapped The tunnel deck evaluations were performed using a 3D Radar step frequency array system mounted to a vehicle The GPR data was analyzed to determine the asphalt overlay thickness and identify areas of deterioration or moisture at the asphalt concrete interface www infrasense com Infrasense performed infrared thermography and high resolution visual scanning of the Hampton Roads Tunnels walls and evaluated the tunnel deck using a 3D ground penetrating radar system

Network Level Bridge Deck Evaluations in Three Wisconsin DOT Regions Wisconsin Total decks Infrasense continued its bridge deck condition evaluations in 3 Wisconin DOT regions 850 Total Area s f 8 5 million 2017 decks 130 Over the past 10 years Infrasense has conducted infrared thermography IR and ground penetrating radar GPR surveys on over 800 decks representing 8 5 million sq ft in Wisconsin s SW NC NW NE and SE regions In 2017 Infrasense conducted surveys on 131 decks The GPR and IR data collection was carried out using a vehicle based system resulting in minimal disruption to traffic After completing the surveys a multi level approach to the data processing and analysis was deployed Level 1 analyses were completed for each deck to provide concrete deterioration rebar level delamination and concrete cover quantities The Level 2 analyses were carried out for a select group of decks and consisted of mapping the Level 1 conditions as well as areas of patching and spalling The final level involved integrating the Level 2 results with detailed underdeck distress maps to create rehabilitation quantities and maps using Wisconsin DOT s deck preparation items Type 1 Type 2 and Full Depth In addition to the multi level bridge deck condition surveys Infrasense completed a Pilot Study to establish a method for measuring the void space between a decorative fascia wall and a mechanically stabilized earthen MSE retaining wall using GPR These MSE retaining walls are used in the design of approximately 100 bridge decks GPR was ultimately proven to be an effective tool for this application as drill hole measurements collected by WisDOT were within 10 2 of the GPR based values on average www infrasense com

Pavement Structure Evaluations Virginia Total pavement miles 2610 lane miles Cores Statewide Network 260 GPR asphalt results within 6 of measured core thicknesses and an average deviation of 0 6 In 2017 Infrasense performed a variety of different pavement projects across the state of Virginia including statewide and citywide network level evaluations and localized project level evaluations for rehabilitation design The largest of these projects was a statewide network level pavement evaluation to support the Traffic Speed Deflectometer TSD structure analysis of 2 520 miles of primary roads throughout Virginia Infrasense recommended 260 locations for confirmative coring and a statistical comparison of the GPR and coring results showed good correlation results for the project GPR asphalt thickness are within 6 of the measured core thicknesses On a smaller scale Infrasense performed network level pavement structure evaluations for the entire city of Falls Church Virginia This included 80 lane miles of GPR and GPS data collected synchronously at multiple offsets on every public road in the city The vehicle based data collection took only 3 days and required no road closure or traffic detours Results were provided to the client in both tabular and GIS compatible formats At the project level Infrasense performed pavement structure evaluations at 4 different locations in Virginia to aid future maintenance and rehabilitation planning The length of these pavement sections ranged from less than a mile to nearly 3 miles GPR data was collected at multiple offsets across the lanes and shoulders in order to provide more detailed pavement structure information for each section www infrasense com Infrasense performed local projectlevel citywide network level and statewide network level pavement evaluations in Virginia

Brooklyn Army Terminal Subsurface Survey using 3D Radar New York Total Area sq ft approx 200 000 Infrasense uses 3D Radar to efficiently and accurately map subsurface utilities Survey completed in less than 1 day where traditional survey methods would have taken a week Infrasense recently completed a project using a groundcoupled vehicle mounted 3D Ground Penetrating Radar GPR system manufactured by 3D Radar to identify subsurface structural objects that would impede future installation of sheet pile walls at the Brooklyn Army Terminal Using the trailer mounted 3D Radar step frequency array system reduced the data collection time significantly and provided an excellent combination of resolution and depth of penetration Using traditional GPR setups to obtain this type of data would require multiple surveys using different frequencies of antennas adding even more time to the data collection process The 3D Radar system uses a 21 antenna array to obtain different frequency data from 300MHz to 3GHz and image the subsurface in 3 dimensions High precision GPS was integrated into the data collection system in order to combine adjacent lines of data and map common subsurface features accurately Final utility maps were provided as plan view drawings and in CAD compatible format These utility map deliverables included locations of utilities underground storage tanks obstructions and structural components possibly related to building foundations Infrasense also discovered a series of railroad tracks that were thought to have been removed in the past but instead were left in place and paved over with asphalt www infrasense com

Research Projects SHRP2 Pavement Debonding with 3D Radar UAV and Fixed Wing Aerial Infrared Thermography Research Infrasense has been committed to research since 1987 Last year we participated in Phases 3 4 of the SHRP2 R06D Project as well as pilot projects using aerial infrared thermography of bridge decks In 2017 Infrasense engaged in several research initiatives from Strategic Highway Research Program 2 SHRP2 tasks to internal research and development projects Having been born from a Small Business Innovation Research SBIR grant Infrasense has always understood and emphasized the value of research and the advancement of the NDE industry as a whole Our primary focuses of 2017 research were using 3D Radar s stepfrequency array to analyze pavement distress and collecting and analyzing aerial infrared and visual data for bridge deck condition evaluations Continuing our work in the SHRP2 Project R06D Infrasense assisted in developing user guidelines and creating pilot workshops for the GPR technologies we previously recommended in Phase 2 Infrasense worked with two of the six states involved in this SHRP2 project to help determine the best applications for the 3D Radar technology and the best methodology for analyzing the data In Florida we performed two rounds of data collection on pavements and bridges to identify the applications of 3D Radar that would best fit the Florida Department of Transportation s FDOT needs Some of the applications of interest included pavement stripping moisture ingress dowel bar locating and bridge deck deterioration The Minnesota Department of Transportation MnDOT on the other hand already owns one of the 3D Radar systems as a result we assisted them in analyzing data they have already collected by creating a prototype software ExploreGPR to help identify stripping and moisture damage in pavements Infrared thermography is one of our primary testing technologies for bridge deck condition evaluations and we are always seeking ways to improve our testing methods In 2017 this research really took flight literally Working with both a company that specializes in drone surveys and a company that collects data from fixed wing aircrafts Infrasense has been investigating the use of aerial infrared thermography and visual data for assessing the condition of bridge decks and other concrete structures Both drone and fixed wing aircraft offer distinct advantages by reducing the image processing requirements and providing more environmental context Infrasense is eager to help get this exciting new technology off the ground www infrasense com VISUAL

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