From the Lab
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| GeoTesting Express (GTX) is pleased to be working with CDM/Hatch Mott MacDonald providing testing services in support of MDC’s Clean Water Project for the City of Hartford, Conn. GTX is performing laboratory testing on rock and soil for the preliminary design phase of the South Hartford Conveyance Tunnel. The total length of the tunnel is estimated at 2.5 miles with a diameter of 20 ft. The depth of the tunnel is expected to range from 130 to 240 ft. below ground surface. Once completed, this tunnel will capture waste water |
discharge from combined sewer outflows within the city of Hartford.
GTX is currently performing strength and index testing for rock including: unconfined compression, slake durability, hardness, triaxial shear, splitting (indirect) tensile strength, Cerchar abrasivity and elastic moduli & Poisson’s ratio. In addition, we are conducting grain size analyses, Atterberg limits, specific gravity, triaxial shear testing and unconfined compression testing of soil.
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GTX has been providing Stantec Consulting with
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overflow laboratory testing services in support of their efforts with the Tennessee Valley Authority (TVA) Coal Combustion By-Products Facilities. Stantec conducted phase 1 assessments of these facilities located in TN, KY and AL and based on that evaluation, each facility was prioritized for phase 2 work. Phase 2 work includes maintenance, vegetation management and removing depressions or ruts in surface areas of various dikes. Phase 2 test bores are either planned or underway at each site to help determine the |
structural stability of the ash and gypsum ponds and
stacks.
GTX was asked to perform over 100 consolidated undrained triaxial tests to help ease the burden on their laboratory and help meet the tight constraints of the project schedule. In addition, we conducted direct simple shear testing to help determine the strength properties of the soils as well as some permeability and index tests to help classify the soils.
Gary Torosian,
978-635-0424
gtt@geotesting.com 
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Pedestrian Tunnel to Lead to
"The General" |
| Geocomp is monitoring the tracks and tunnel construction at the Kennesaw Pedestrian Tunnel for Bradshaw Construction. When the tunnel is completed, visitors to Kennesaw, Georgia’s historic district will be able to safely reach museums |
and other attractions by crossing beneath an active CSX railroad line, which runs through the heart of the city.
Geocomp is monitoring the vertical dis-placement of the tracks and alignment of the
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Green dots indicate the position of the
monitoring points
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13.5-foot diameter tunnel using automated motorized total stations (AMTS) to collect readings every minute. The data is fed to iSite Central, Geocomp’s real-time, web-based data collection and reporting system. The system also provides early warnings of unacceptable or surprise movement, and will be critical during the planned 24/7 tunneling operation and associated compensation grouting. The system will alert team members, including Hayward Baker— providing the grouting; JJE—the general contractor/ excavation bracing; HDR/CSX; URS— the designer, and the City of Kennesaw.  |
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Geocomp President & CEO Dr. W. Allen Marr, P.E., was granted the status of Diplomate, Geotechical Engineering (D. GE) by the Academy of Geo-Professionals (AGP) on Nov. 3, 2009, at the 24th Central PA Geotechnical Conference, held in Hershey, Pennsylvania.
The AGP was formed by Geo-Professional Engineers from the Civil Engineering Certification, Inc. (CEC), which is a separately incorporated and wholly-owned subsidiary of the American Society of Civil Engineers (ASCE). Its goal is to improve the practice, elevate the standards, and advance the geotechnical engineering profession. Allen was among a group of 24 professionals honored with this distinction.
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W. Allen Marr (left) with Arlan H. Rippe,
AGP president
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