Michael B. Gilbert, P.E. Vice President

Transcription

1 Vice President Mr. Gilbert has over 35 years of experience in the area of geotechnical engineering. Much of his experience has been specifically focused on tunneling projects. He has served as the lead tunnel designer and coordinated the efforts of engineers, geologists, technicians, and subcontractors in various aspects of project investigations, design, and construction inspection for tunnel projects, including highway, mass transit, water supply and sanitation, and also has extensive geotechnical experience with pipeline and foundation design. Tunnels Lead Geotechnical/Tunnel Engineer: NLTN PP03 - Project Preparation Technical Assistance Facility Subproject for Ho Chi Minh City Environmental Sanitation Project, Phase to Present. Mr Gilbert is the lead for the on-going tunnel design. Project consists of 8 km of 3200mm RCP tunnel that will be microtunneled along the Saigon River bank in HCMC. There are 18 separate jacked segments including a maximum drive length of 1030 m in soft clay. Lead Tunnel Engineer; Canaos By-Pass Experience Highlights Tunnel in Bogotá Columbia 2013 to present Over 308,700 lf of soft ground tunnels Mr Gilbert is the lead tunnel designer for this project that involves connecting the 4,200 mm Over 39,900 lf of hard rock tunnels ID ITC Tunnel and the 3,200 mm Emergency Over 149,900 lf of Microtunnels Tunnel underground. Because of contract and land issues both tunnels were terminated underground. The owner now wants to connect these two tunnels with a final terminal point in the WWTP site. Tunnels are in soft rock and will require hand mined excavation using air spades and rib and lagging support with a shotcrete final lining. Education M.S. - Civil Engineering, Northeastern University, 1977 B.S. - Civil Engineering, Northeastern University, 1973 Registration Professional Engineer: Maine (1979), Massachusetts, Illinois, Minnesota, Missouri, Nebraska, Tennessee and Washington Lead Tunnel/Geotechnical Engineer: Raw Water Intake Tunnel, Kingsport TN 2013 to Present Mr Gilbert is the lead tunnel designer for the geotechnical exploration program and tunnel design. Explorations for this 1100 lf 8-ft horseshoe tunnel included a 600 ft horizontal drilled hole parallel to the tunnel alignment to take advantage of the site topography. Currently the design is at 90% and will allow the contractor to either use drill and blast or roadheader for excavation. Rock consists of limestone and claystone with a well-defined fault zone. The strength of the limestone is an issue with roadheader excavation which would result in a larger cross section than is required for operational use. Technical Lead for Evaluation of Alternative Alignments of Thames Tideway Tunnel, London England, 2013 Mr. Gilbert provided the technical lead in evaluation of alternatives for tunnel drive length and location of shaft sites for the 7200mm ID tunnel with a long drive length of 7km and the feasibility of increasing drive lengths to 12km. Lead Geotechnical/Tunnel Engineer, Suffolk County Sewer Outfall, New York City, New York, 2009 to Present. Mr. Gilbert is the lead geotechnical/ tunnel engineer for the explorations and design of this outfall replacement tunnel under South Bay Cove from the

2 Bergin Point wastewater treatment plant. Work involves both land and marine borings to locate the tunnel vertical alignment. The tunnel is currently in final design and will be lf and 12 feet in diameter. Ground conditions transition from sand to clay. The lining system will be gasketed precast concrete segmental lining with a prestressed cable to address surge loads. Launch and exit shafts were both designed with groundfreezing as the SOE because of limited site space and environmental issues. Lead Geotechnical/Tunnel Engineer, WASA CSO Tunnels, Washington DC, 2007 to 2009 Mr. Gilbert served as the lead geotechnical engineer for the advanced feasibility design of approximately 18 miles of 15- and 23-feet inside diameter (ID) combined sewer overflow (CSO) tunnels in the nation s capital. The project involved design and implementation of an exploration program of 71 borings including marine borings in the Anacostia River. Borings drilled in this phase of the program provided sufficient subsurface data to make geotechnical recommendations on the various tunnel alignment options and to develop preliminary costs for the selected alignment. Technical Reviewer, Harbor Siphon Tunnel, New York, New York, 2005 to Mr. Gilbert provided technical review of subsurface geotechnical conditions being encountered during the marine explorations for this siphon tunnel. The 10,000-lf tunnel spans the entrance channel to New York City Harbor and will have a 12-foot outside diameter (OD) with a 72-inch pipeline. It will connect Staten Island and Brooklyn with an emergency water supply to replace an existing service that will be removed when the channel is dredged to a deeper depth. Soil conditions range from very soft, silty clays to medium dense sand and gravel. Mr. Gilbert also provided guidance on the ground freezing design for the shafts at the tunnel termini. Chief Geotechnical Engineer, Brightwater Tunnel, King County, Washington, 2002 to As chief geotechnical engineer, Mr. Gilbert oversaw the geotechnical program for the design of this 13-mile soft ground tunnel project. It included 5 deep shafts, including one that was supported by ground freezing, and over 3,000 lf of microtunneling. This work included overseeing the geotechnical investigation; laboratory testing; and preparing the geotechnical data, interpretative, and baseline reports for three separate tunnel contracts. Tunnels range in size from 14-feet to 20-feet OD. Influent tunnels will transport sewerage to the treatment plant and effluent water to a new outfall into Puget Sound. All tunnels excavated in soft ground with as much as 450 feet below the ground surface and 220 feet of water pressure head. Tunnels ranging in size from 15- to 19-feet ID are all completed. Technical Reviewer, Oakwood Combined Sewer Overflow (CSO) Control Facility and Pump Station Design, Detroit, Michigan. Mr. Gilbert performed a design review of the completed pump station slurry wall support system, which is about 65 feet deep. The bottom of the excavation comes to within about 10 feet of rock. The excavation made use of slurry wall construction and successfully controlled the artesian pressure in the underlying rock. The review included slurry wall construction, dewatering, and rock pressure grouting. Technical Review of the Connection Tunnels to the CSO Phase II Facilities Planning, Fall River, Massachusetts, 2007 to 2009 Mr. Gilbert was responsible for providing geologic and geotechnical engineering interpretation and cost estimates for five drop shaft and connection tunnels to the recently completed 20-foot diameter CSO tunnel. These connection tunnels were all excavated using drill and blast in granite with minimal support

3 consisting of rock bolts and in one tunnel ribs and shotcrete. Tunnels ranged in length from 75 to 500 lf and had cross-sections of 10- to 12-feet in width and heights of 8- to 12- feet. Lead Tunnel Engineer, Ellis Avenue Tunnels, Fountain Valley, California, 2005 to 2007 Mr. Gilbert recommended that two tunnels be excavated, rather than two different size microtunnels. This eliminated most of the traffic issues and provided an economy with regards to the TBM mobilization. Bids showed a cost savings of $5 million with rib and lagging. The project was completed on time with change orders of less than four percent. Lead Tunnel/Geotechnical Engineer, Myers Park High School Tunnel, Charlotte, North Carolina,2007 to Mr. Gilbert completed the exploration and design of this 8- foot diameter rock tunnel. The alignment goes directly under the high school campus for a distance of 2,423 lf of tunnel. The design included preparation of a GBR to cover issues in both alignments. Tunnels are currently under construction. Geotechnical Tunnel Consultant, North Carolina Sewer Project, Charlotte, North Carolina, 2006 to Mr. Gilbert completed design of two 98-inch OD rock tunnels in Charlotte, North Carolina, with one common main tunnel shaft that will form a Y connection. A 64-inch water main was installed in a 700-foot long tunnel and 48-inch main in the 1,700 lf tunnel section. One leg of the tunnel crossed under two highways and the second transverse under the apron to Charlotte Airport runway. The initial lining support types that were designed consist of light rock bolts, pattern rock bolts and ribs and lagging where the overlaying rock is decomposed and will not support rock bolts. Tunnel construction has been completed. Lead Geotechnical Engineer, Tunnel Design, L-73 Tunnel, Woodbury, Minnesota, 2003 to 2005 Mr. Gilbert completed the design and provided consultation to Metropolitan Council Environmental Services (MCES) during the construction for this 8,080 lf tunnel, which has an 8-foot bored diameter, is feet deep and included three main shafts up to 75 feet deep. Geotechnical data, interpretative and baseline reports were prepared for the contractors to use as a basis for bidding. The tunnel conditions ranged from loose to medium dense sand below the groundwater to a rock tunnel in the St. Peter Sandstone except for additional boulders. Lead Tunnel Engineer, Deer Creek Tunnel, St. Louis, Missouri, 2003 to As lead tunnel designer, Mr. Gilbert oversaw the final design of the tunnel alignment and lining design for this 7,100-foot, 20-foot OD in limestone rock tunnel. As the lead on the tunnel design, CDM Smith selected the vertical alignment of the tunnel in consultation with the hydraulics designers, established criteria for the horizontal alignment, developed rock loads on the lining, designed the final lining, and prepared the GBR and tunnel cost estimates. Support consists of rock bolts as function of the rock quality. The final lining will be cast-in-place concrete. Senior Geotechnical Engineer, Tunnel Design, Central Artery Project Immersed Tube Tunnel Crossing of Fort Point Channel Contract, Massachusetts. Mr. Gilbert was responsible for overseeing the geotechnical design performed by both in-house staff and by a geotechnical subconsultant for the Central Artery/Tunnel, Fort Point Channel Crossing, Design Contract D009B for the Massachusetts Highway Department. Geotechnical designs included a 55-foot deep casting basin for construction of Immersed Tube Tunnels, 65-foot diameter cellular cofferdam, dredging in the Fort Point Channel to

4 within five feet of the twin 24-foot non-reinforced concrete lined Massachusetts Bay Transportation Authority (MBTA) Red Line Tunnels, over $800,000 of instrumentation hardware to monitor these tunnels, drilled shafts to support the ITT in place, settlement analyses, dewatering and recharge systems and geotechnical instrumentation. Geotechnical Project Manager, Inter-Island Tunnel, Massachusetts Water Resources Authority (MWRA), Boston, Massachusetts For MWRA s Inter-Island Tunnel project (DP-5), Mr. Gilbert was responsible for investigations that consisted of a multimilliondollar exploration program for the connecting tunnel between the Nut Island and Deer Island treatment facilities and preparation of an environmental design summary report (EDSR) and GDR for the tunnel. The tunnel is 5 miles long with a finished diameter of 11.5 feet and will be a minimum of 70 feet below the top of the rock. Two shafts, each more than 275 feet deep, connect the tunnel to the wastewater treatment facilities. The tunnel rock structure was mapped during construction. Geotechnical Project Engineer, Caisson Design Pump Station, Detroit, Michigan Mr. Gilbert was responsible for exploration and design associated with major additions to the existing wastewater treatment plant (WWTP) in Detroit, Michigan. The additions consisted of a major pump station that was designed as a 150-foot diameter caisson sunk in the soft clay to final grade. The caisson was on piles to rock to stop it at design grade. Design also included two 20-foot diameter tunnels located between two pile supported aeration tanks and making a live connection to a surcharged 15-foot concrete lined tunnel with wood lugging. The connection consisted of seven 5-foot diameter stub tunnels to the new pump station. Chief of Geotechnical Section, International Sewer Project, Alexandria, Egypt Mr. Gilbert was responsible for a long-term assignment that included geotechnical design, specification preparation, and technical support during bid for design of two primary treatment plants, five pumping stations, 27 kilometers (km) of pipe-jacked soft-ground tunnels, 3 km of precast concrete liner plate tunnel through the center of Alexandria's business district, and more than 150 km of gravity sewer pipe ranging in diameter from 150 to 2,800 millimeters. He was also responsible for reviewing contractor shop drawings for gravity sewer pipes and five major pump stations, including major dewatering and slurry wall construction. Project Engineer, Outfall Sewer Design, MCUA Outfall Sewer, New Jersey. Mr. Gilbert was the engineer responsible for designing an 11-foot, one-pass pre-cast segmented tunnel. This project involved designing a lining for the various soil conditions anticipated and developing tunnel specifications, including geotechnical instrumentation. Geotechnical Project Manager, District Heating Hot Water Tunnel - St. Paul, Minnesota. Mr. Gilbert provided geologic and geotechnical engineering for the design and construction of two, 30-inch insulated high-pressure hot water mains for district heating throughout the business district of St. Paul. This project included design and construction of a 400-foot-long, 12-foot-high cathedral-shaped tunnel through the St. Peter Sandstone. The tunnel was constructed using a hydraulic lance to cut the stone. Geotechnical Project Manager, Sewer Tunnel Design, Greenwich, Connecticut. Mr. Gilbert was responsible for the construction of a 600-foot-long, 6-foot-diameter drill and blast tunnel in gneiss. This project involved monitoring vibrations and air pressures

5 due to blasting. The 350-foot main tunnel also included a 250-foot-long branch tunnel to form a "Y." All of the work was done in a residential section of the town. Microtunnels Tunnel Review and Benchmark Study BHP Billion Seawater Intake and Discharge Chile Lead reviewer of a benchmarking study for a total of four 2-meter ID open water microtunnels; two for intake both 527 m and two discharge both 317m in length. All four tunnels are proposed to be excavated in Diorite. This marine project includes one launch shaft for all four drives, the tunnels and ocean shafts for wet retrievals of the MTBM. The report benchmarked the key tunnel parameters including tunnel size, length, open water depth, rock cover and method of tunneling. The geotechnical conditions were also evaluated; including rock strength, abrasion and evaluation of the geological setting as a reason for the low rock compressive strength. A risk register was prepared and also a comparison of the costs developed by the design engineering firm was compared to our database of similar projects. Tunnel Design Technical Lead, M St. Tunnels Washington, District of Columbia. As part of the project team for the Division E M Street Diversion Sewer Project of the DC Clean Rivers Projects for DC Water, Washington D.C., MR. Gilbert performed the technical tunnel design lead for two tunnels : 1014 lf of 48-in and 1313 lf of 108-in sewer. Design was performed and specifications developed to allow the bidders to select the method of tunneling (microtunnel or conventional), ground modification and lining support systems. Lead Tunnel Design, Tingey St. Microtunnel, Washington, District of Columbia. As the technical lead for the tunnel design of this design/build project Mr. Gilbert is in charge of the design of this 72-in RCP microtunnel that is approximately 1200 lf in length. Extensive 3D modeling using FLAC 3D was performed to evaluate effect of jacking loads on the brick lined Tiber Creek Tunnel which is in very poor conditions. Design also required ground modification consisting of permeation grouting to protect the East Side Interceptor sewer and jet grout columns to support the Tingey St sewer in soft clay and miscellaneous fill. Technical Lead, Narragansett Bay Commission CSO Control Facilities Program Phase II, Providence, Rhode Island, 2011 to Mr. Gilbert was the technical lead for the design of the geotechnical and microtunneling aspects of the project. This project originally conceived as open cut was finally designed as 8,200 feet of tunnel with a 48-inch RCP carrier pipe. Tunneling will be in silty sand below the groundwater table. Lead Tunnel Design The South Interceptor and Mather Interceptor Project, Sacramento, California Mr. Gilbert was the lead tunnel design for the project that consisted of 15,000 linear feet of pipes varying from 54- to 72-inches. Tunnel design was based on pipe jacking technique using digger shield type excavation machine. The project also included design and construction of several deep shafts. Technical Review, Replacement of the Existing water Siphons between Brooklyn and Staten Island, New York City, New York, 2008 to Mr. Gilbert reviewed various aspects of this project including geotechnical investigation, GBR/GDR/GIR reports, structural design of TBM launch and receiving shafts using ground freezing technique, and design of two trenchless crossings using microtunneling techniques to install 84-inch diameter casing pipes under Staten Island Rail Road tracks.

6 Lead Tunnel Design, Tollgate Relief Interceptors, Aurora, Colorado, 2008 to Mr. Gilbert led the microtunnel design of the North and South Tollgate Interceptor projects. The South contract consisted of 6,000 linear feet (lf) of pipeline, including more than 1,000 lf of 54-inch microtunneling in soft rock, mixed-face, and loose- to medium-dense alluvium soils. The North contract consisted of 10,000 lf of pipeline. Approximately 4,500 lf required microtunneling using a 54-inch minimum-sized casing and as much as 9,800 lf could be tunneled. As part of the contract documents, both a geotechnical data report (GDR) and geotechnical baseline report (GBR) were prepared for each contract. Currently the South Tollgate work is completed and more than 75 percent of the North Tollgate tunnel work is completed. Technical Review for the Arlington Interceptor Pipeline and Tunnels, Arlington, Virginia, 2009 to Mr. Gilbert provided technical review of the subsurface conditions and methods of tunneling for this 60-inch gravity sewer under Arlington National Cemetery in Virginia. Tunneling will involve subsurface conditions ranging from mixed face of silty sand overlying gneiss and loose sands overlying organic silt deposits. Tunnels ranged in length from 500 to 1,000 feet using microtunneling. Lead Tunnel Engineer, RMMA SER 2278 Water Main Project, Austin, Texas, 2007 to 2008 This project included three trenchless crossings: two 48-inches jack and bore each about 125 feet in length in soft ground and a 60-inch crossing under US-290 that is 475 lf in length in limestone. The design included development of a GDR and a GBR for all trenchless crossings and plans and specifications for the trenchless work. Lead Tunnel Engineer, I-270 Tunnel Crossing St. Louis, Missouri. Mr. Gilbert was responsible design and construction of a 48-inch-diameter jacked casing with water main installed across I-270 in fill and fine sand and silt. The project was prepared in fast-track mode and completed within the schedule required by Missouri American Water Company. Lead Tunnel/Geotechnical Engineer, Bliss Run Tunnel, Columbus, Ohio 2005 Mr. Gilbert completed the exploration and design of this 7-feet microtunnel in saturated silty sand. This 370-foot tunnel was used as an alternative to open cut to avoid disruption to traffic and commercial businesses. Technical challenges included the design of a grouting system to stabilize the bedding of an existing 36-inch sewer line that was successfully crossed, with less than 2 feet of clearance in addition to the grouting required for face stability during advancement. Lead Tunnel Engineer, Intake and Rock Tunnel Design, Table Rock, Greenville, South Carolina, 2004 to Mr. Gilbert completed the design and construction of the Table Rock Tunnel and intake. The tunnel was designed as a 5-foot-diameter, rock tunnel under the 60-foot high earth filled Table Rock Dam. The design included the preparation of plans, specifications, geotechnical data report (GDR) and GBR. The tunnel ties into a new intake structure located about 100 feet out into the reservoir. The exploration program consisted of two phases of drilling and geophysical survey to help identify the interface between highly weathered rock and sound rock. The location of the tunnel was based on identifying a zone that would allow for the tunnel and connecting intake to be excavated in sound rock. Tunnel Consultant, Replacement Sewer, Pueblo Canyon, Arizona, 2003 to Mr. Gilbert revised the tunnel specifications for the replacement of 12,000 lf of the Pueblo Canyon sewer. The project involved 35 separate microtunnel segments totaling 9,000 lf of

7 trenchless construction in loose sand and Tuff. Work was successfully completed in the allotted time schedule due to Mr. Gilbert s modifications to the specifications that allowed the contractor to use various trenchless techniques that were acceptable to the line and grade tolerances without damaging the existing Hoodoos (a formation of stacked boulders). He made recommendations that required both microtunneling and jack and bore methods. The contractor succeeded in installing over 9,000 lf of sewer by tunneling in a 120-day period, beating the schedule and thunderstorms by one week. Technical Specialist, South Central Hillsborough Intertie, Tampa Bay, Florida Mr. Gilbert provided tunnel assistance by reviewing shop drawings for all tunneling submittals for this sewer project. Tunnel crossings included 8- to 10-foot ID tunneled crossings using various techniques, including compressed air, open shield with sand shelves, and pipe ramming. Ground control was attained by dewatering and compressed air. Geotechnical Project Manager, Instrumentation System Design Oakwood Beach Water Pollution Control Plant, Staten Island, New York As the geotechnical project manager for the West Branch Interceptor Contracts 6B-3 at the Oakwood Beach Water Pollution Control Plant, Mr. Gilbert was responsible for designing a geotechnical instrumentation system to monitor performance of 4.5 miles of 8-foot ID tunnel with conventional precast concrete segmental lining. The project included making predictions on ground movement and pipe stresses due to tunneling activities such as grouting, back graveling, dewatering using ejector wells, and jacking the shield against the lining to advance the heading. He also designed, installed, and monitored an instrumentation system and monitored construction activities. He analyzed the collected data and prepared a report summarizing the performance of the tunnel lining. Geotechnical Project Manager, Contract 6B1 Instrumentation System Design Oakwood Beach Water Pollution Control Project, Staten Island, New York Mr. Gilbert was responsible for designing the geotechnical instrumentation system to monitor performance of 1.5 miles of 60-inch OD tunnel installed by microtunneling method for the Oakwood Beach Water Pollution Control Project, West Branch Interceptor. This was one of the first major applications of Hobas Pipe. The results of the instrumentation were used by the Bureau of Sewers for future tunnel work in the city. The project included making predictions of ground movement and pipe stresses due to jacking loads and soil loads. Construction procedures such as grouting, dewatering, and resulting disturbance to the soil were considered in the analysis of the data and preparing a report summarizing overall pipe performance. Tunnel Rehabilitation Technical Specialist, Tunnel Rehabilitation, Situate Aqueduct, Providence, Rhode Island, Mr. Gilbert was responsible for providing technical guidance during the inspection, evaluation, report presentation and development of a cost estimate for the rehabilitation of the Situate Aqueduct. This is a horseshoe-shaped rock tunnel over 6 miles long that was constructed in 1920 for the Providence, Rhode Island, Water Board. Recommendations resulting from the inspection included a means of accessing the tunnel for the repairs that included reactivating the abandoned and filled tunnel shaft used during the original construction.

8 Technical Specialist, Tunnel Rehabilitation, Catskill/Delaware Aqueduct, New York City, 2007 to Mr. Gilbert performed a review of the inspection and rehabilitation recommendations of this tunnel. The inspection team performed an internal physical inspection of a 2.5-mile section of the Catskill Aqueduct, constructed in about 1910 was to be pressurized to convey additional raw water to the new disinfection facility. The tunnel is generally concrete-lined and varied in shape from a 17-foot-diameter circular tunnel to a 17- by 13-foot horseshoe-shaped tunnel. The tunnel inspection included a preliminary inspection to confirm the tunnel geometry and general condition. This phase included coordinating two to three teams inside the tunnel at the same time to map the tunnel over a 2-day period. Mapping by each four-person team included identifying all significant cracks, infiltration and defects, as well as structures and previous repairs over the length of the tunnel. Technical Lead, Inspection and Rehabilitation of Heroes Tunnel, New Haven, Connecticut, 2007 to Mr. Gilbert reviewed the inspection results and recommendations of a multi-disciplinary field inspection that included geophysical testing ground penetration and ultrasonic measurements as well as visual inspection with hammer sounding to determine the integrity of the 2-foot-thick tunnel liner, shaft structure, and the masonry façade. The final report provided state-of-the-art methods for stopping or minimizing water leakage through tunnel lining and ventilations shafts and for repairing the damaged concrete. Horizontal Directional Drilling Technical Lead Geotechnical/Tunnel Engineer, HDD Crossing of Raritan River, New Jersey, 2009 to Mr. Gilbert served as the technical lead for the design of this 24- inch water main that set a record for length of fpvc at 5,350 lf in length. Exploration program consisted of both land and marine borings to develop the subsurface profile and used to set the vertical alignment of the water main in soil and to avoid an interface of with the rock. Technical Lead, Horizontal Directional Drilling (HDD) Milwaukee Gas Pipeline, Michigan, 2009 to The entire pipeline was designed within existing municipal or state right-of-way and was comprised of 9 miles of HDD and 4 miles of open cut construction. Mr. Gilbert was the technical lead for the geotechnical and trenchless crossings including all HDD work. Technical Review Horizontal Directional Drilling (HDD) Union Road, Spring Valley, New York, 2011 to Mr. Gilbert performed a technical review of data developed from a subsurface exploration and laboratory testing programs. Laboratory testing program included both soil and rock testing. He reviewed the design of the vertical alignment of the HDD profile, for the design of the 16-inch-diameter HDPE (750-ft long) forcemain, drawings and specifications for the HDD portion of the work. Technical Review, Horizontal Directional Drilling (HDD) Bees Ferry Road Design and Relocation of Sanitary Sewer Force Main, Charleston, South Carolina, 2011 to Mr. Gilbert reviewed design of the 10- and 12-inch-diameter fpvc (420-ft long) and the 36-inch-diameter fpvc (810-ft long) forcemains. Technical Review, Horizontal Directional Drilling (HDD) Dravo Forcemain, Louisiana, 2010 to Mr. Gilbert performed technical review of the vertical

9 alignment of the HDD profiles, for the design of the 30-inch diameter fpvc (650-ft long) and 36-inch diameter (630-ft long) forcemains, and for plans and specifications for the HDD portion of the work. Technical Review, Horizontal Directional Drilling (HDD) Governors Island, New York New York 2010 to 2012 Mr. Gilbert performed a technical review of proposed HDD works including design a 2,200 ft long, 12-inch diameter forcemain, plans and specifications. Technical Review, Horizontal Directional Drilling (HDD) Kings Highway HDD, Suffolk, Virginia 2011 to 2012 Mr. Gilbert performed a review of Geotechnical Data Report, plans and specifications for HDD river crossing or a 2,100 ft long, 16-inch-diameter forcemain. Senior Geotechnical Engineer, Horizontal Directional Drilling (HDD) Wareham, Massachusetts, 2012 Mr. Gilbert did a technical review of a HDD design for 4-inch-diameter, 575-ft long HDPE forcemain including plans and specifications. Publications Avolio, G. and M. Gilbert. Geotechnical Investigation for Soft Ground Tunnel in Alexandria, Egypt RETC, Vol. 1, Ch. 3, New Orleans, Louisiana, 1987 Gilbert, M., V.J. Perrone, and L. Maday Exploration Decision Analyses for Brightwater Tunnels RETC, Section 9, Ch. 64, Seattle, Washington, 2005 Bachand, M.L. and M.B. Gilbert Innovative Solution: A combined tunnel option for wastewater applications. ASCE Pipeline Conference Proceedings, Houston, Texas, June Haß, H. and M.B. Gilbert Support of the Leipzig City - Tunnel Extension Using a Tie-Back Supported Freeze Wall RETC Conference Proceedings, Section 3, p 197, Toronto, Canada, June Gwildis, U.G. and M.B. Gilbert Comparison of Risk Management Strategies for Microtunneling American Society for Trenchless Technologies Conference Proceedings, San Diego, California, April Newby, J., M. Gilbert, and L. Maday. Establishing Geotechnical Baseline Values for Deep Soft Ground Tunnels North American Tunnel Conference Proceedings, Track 3, Session 4, San Francisco, California, June Gilbert, M. and S. Dentz. L-73 Tunnel Woodbury Minnesota North American Tunnel Conference Proceedings, Track 4, Session 2, San Francisco California, June Short Tunnels = High Risk?: Pipeline Construction Involving Open Cut and Tunnel Segments Gilbert, M and Schultz, M. Part14 p 881 RETC, Las Vegas NV, June 2009 Wawrzyniak C. and Gilbert, M. Tunnels of the High Speed Railway System in Germany Proceeding of Seminar Tunnels of the World Planning, Design and Construction March 29-30, 2010 ASCE Met Infrastructure Group, Brooklyn NY Gilbert, M., Wesley, J. and Nyirenda, S. Tunneling to Preserve Tollgate Creek Proceeding of North American Tunnel Conference, Track x Session X4, Portland OR, June 2010.

10 Gilbert, M., Schultz, M., Wright, B. and Kelly, K. Risk Issues Associated with New Outfall Tunnel Under Great South Bay in Suffolk County, New York Part 6, p 374, Proceeding of RETC, San Francisco CA, June 2011 Haß H, Löffler, M, Michael Gilbert, M. Tunnel Boring Machine Rescue Projects, Section 3 Ground Treatment p 743 Proceedings of NAT, Indianapolis IN June 2012 Gilbert, M, Bernardeau F, Schultz M. Design-Build Tunneling Project in Urban Setting with Fast-track Engineering and Ground Modifications p.---- Part p, Proceeding of RETC, Washington DC, June 2013 Presentations Gilbert, M. Salinity Influence on Frozen Soils Strength. Presentation of paper by: Helmut Haß, Regine Jagow-Klaff and Rudolf Wernecke at the ASCE, 13th International Conference on Cold Regions Engineering Session C7: Frozen Soil Strength, University of Maine Orono, Maine, July 23-26, Gwildis, U.G. and M.B. Gilbert. Comparison of Risk Management Strategies for Microtunneling. American Society for Trenchless Technologies Proceedings, San Diego California