March 4th, 2014
Owner: Cargill, Inc.
Client: ADF Engineering
Location: Memphis, Tennessee
Services: Geotechnical, Drilling, Subsurface Utility Engineering, Soils & Materials Testing
Geotechnology provided geotechnical subsurface exploration and subsurface utility locating services to Quality Level B, helping identify potential utilities in the area of proposed grounding rod installations. The project included the construction of approximately 22,150 feet of one to two railroad tracks north of Harbor Avenue on President’s Island Industrial Park.
Field exploration consisted of drilling 48 borings of depths ranging from 15-60 feet using all-terrain rotary drill rigs. Standard Penetration Tests (SPT’s) were performed using automatic hammers. Blow counts, or ‘N’-values, were recorded and are presented on the boring logs. Split-spoon and relatively undisturbed samples were obtained in general conformance with applicable ASTM standards at the depths indicated on the boring logs.
Geotechnology also performed multiple laboratory tests on select soil samples. Testing included: moisture content determinations, Atterberg limits, grain size analysis, unconfined compression strength testing, unconsolidated-undrained triaxial compression (UU) testing, consolidated-undrained triaxial compression (CU), direct shear, one-dimensional consolidation, and relative density.
StructureScan was performed using Ground Penetrating Radar (GPR) using Geonics EM31 and EM61 and 3D GPR data. The surveys were conducted to determine the reinforcing steel layout in a holding tank foundation and tilt up wall.
All of the tests performed were used by Geotechnology in providing engineering analysis and consulting services to the client. Detailed recommendations were provided as a result of Geotechnology’s interpretation of exploration data and past experience.
June 18th, 2013
Owner/Client: Missouri Department of Transportation (MoDOT)
Location: St. Louis, Missouri
Services: Subsurface Utility Engineering
Geotechnology provided Subsurface Utility Engineering (SUE) services for MoDOT District 6 in support of the seismic retrofit of Interstate Highway 64 from 11th to 7th Streets and 22nd and 21st streets in downtown St. Louis. SUE Quality Level D through A services were performed in advance of retrofitting 47 piers for compliance with new seismic requirements.
Electromagnetics, Radiofrequency, and Ground Penetrating Radar (GPR) were used to trace the locations of utilities. Utility locations were designated, surveyed by the project surveyor, and recorded on final drawings. Geotechnology provided Quality Level A vacuum excavation services as described in ASCE Guidance 38-02.
Additional services provided for this project included drilling, materials testing and sonic logging.
June 18th, 2013
Owner: Illinois Department of Transportation (IDOT) – District 8
Location: East St. Louis, Illinois
Services: Subsurface Utility Engineering (SUE), Drilling
Geotechnology was awarded a 24-month subsurface utilities engineering (SUE) contract for various routes in various counties through the Illinois Department of Transportation (IDOT) Region 5, District 8 as a result of a qualifications based procurement.
In June 2008, the first SUE work order under this contract was issued. The task is related to the design and construction of the New Mississippi River Bridge (MRB) approach ramps from Route 3 to the river. Geotechnology performed SUE quality levels D, C and B services within a 400-foot wide right-of-way area from the Mississippi River to 300 feet east of Route 3, approximately 3,200 feet. Geotechnology and its subconsultant Engineering Design Source, Inc. obtained and researched records from various utility companies, located and surveyed visible features and designated locations of underground utilities through use of geophysical surveying.
Based on the SUE Quality level B information obtained and after review by IDOT and the MRB design team, Quality Level A information was obtained at 22 selected utility sites. Potholing to verify the underground utility and determine its size and depth was performed using Geotechnology’s air knife and crews.