ZAPATA has extensive experience in geophysical investigations related to transportation and infrastructure, from roads and bridges to dams and tunnels. Surveys have been provided in all phases of infrastructure development from planning to construction to inspecting the stability of aging facilities.
ZAPATA performed geophysical surveys along the planned US-69 Pittsburg Bypass corridor in Kansas. The planned corridor alignment of approximately 5.8 miles in length crosses known and suspected areas of historic underground coal mines at depths ranging from 20 to 100ft. The geophysical evaluation provided KDOT’s geologist and engineers an understanding of the locations of the mine workings, and will aid in the site evaluation during the design, grouting mitigation effort, and construction phases of the project. ZAPATA employed three surface and borehole geophysical methods and downhole imaging tool, including: 1) DC-Resistivity (DC-Res); 2) multi-channel analysis of surface waves (MASW); 3) guided waves (GW), and 4) sonar. The geophysical surveys were complemented by 32 exploratory borings performed by KDOT.
ZAPATA, in cooperation with Brierley Associates, performed a surface seismic survey along the planned alignment of the Lake Mead No. 3 tunnel project, located in Clark County, Nevada. ZAPATA employed innovative data acquisition parameters to image four high-angle faults within a complex geologic setting to a depth of up to 680 ft, while the tunnel construction activities were occurring on both ends of the seismic profile.
ZAPATA conducted surface high-resolution shear wave (HRSW) reflection surveys along three lines within the 0.85 mile section of the IR-70 right of way. The purpose of the investigation was to map the presence of abandoned underground coal mine workings and to determine the extent of undermined areas beneath three selected sites along the highway. Exploratory borings advanced by ODOT encountered mine voids at depths ranging from 12 to 65 feet. The project provided invaluable information for ODOT to implement a remediation program.
