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"Bringing analytical knowledge into the field where hydrogeologic, hydrologic and environmental problems need to be solved."
GEOPHYSICAL SERVICES
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CGS history in providing geophysics includes 1) groundwater and geologic (borehole) analyses to support water resources investigations, 2) numerical modeling of water resource systems based on hydrologic and hydrogeologic data, and 3) providing the field work to collect parameters to support these efforts. Electromagnetic surveys with GPS grew out of field data collection for water resources and expanded to include environmental work such as detection of earth disturbance, defining landfill boundaries and groundwater conductivity and transport.
EM61-MK2 with hand cart and GPS used to define WWII Disturbance Areas (CGS EM Survey for AECOM, Cold Bay, Alaska 2016)
Groundwater geophysical services began with analyses for a research water well in Kansas (Journal of Geology), and included work with a neutron probe to define saturation levels in unsaturated work. More recently CGS has provided video inspection services for potable wells including City of Soldotna to help troubleshoot issues with well screen design and well rehabilitation.
Numerical modeling was integrated into CGS background in geophysics and has primarily been useful in providing well flow recommendations for single production wells and well field analyses, as well as providing general aquifer parameters for water resource recommendations.
Field work to obtain data is of primary importance in all fields of geophysics. CGS has numerous field instruments for collection of water resource data including dataloggers with sensitive transducers and other needed logging instrumentation for atmospheric pressure etc., specialty pumps and flow meters, electronic water level meters. Most equipment is designed for collection of data in remote areas and considers equipment transport issues.
CGS specialized work in geophysics currently includes water treatment projects, and current capabilities include antenna and datalogger development, turbidimeter development, close-range remote sensing and remote data collection.
Innovative instrumentation and traditional geophysics applications have been used to solve client problems and for general research. Here, car engine temperatures are being measured remotely in front of the CGS offices at the Homer Professional Building.
Electromagnetic Anomalies
Electromagnetic Anomalies mapped for a client looking for evidence of previous land development practices