CES investigated the large-scale collapse of concrete pavement and a wastewater treatment pond at an active concrete ready-mix plant.  GPR surveys were conducted and test borings were advanced to determine the nature and magnitude of the collapse.  The investigation revealed that the collapse was not due to sinkhole activity but instead to the recent construction of a large diameter natural gas transmission line 60 feet below ground and several hundred feet east of the facility. We designed a remediation plan that included temporary relocation of equipment and structures, removal of concrete debris, dewatering the shallow aquifer, excavation of loose sand 30 feet deep, backfilling with compacted clay, and replacement of concrete pavement.  Also provided construction oversight.

CES conducted reconnaissance GPR survey of 20-acre parcel being considered for construction of the new hospital. Survey identified numerous and variable anomalies.  Additional investigation was conducted using Electrical Resistivity (IR), which also found numerous and variable anomalies.  Evidence of wide-spread near-surface and deep sinkhole activity was overwhelming.  The project site was abandoned without confirmatory drilling.

CES used EM and GPR to identify the likely locations of buried fuel and waste oil tanks and product lines at an interstate truck stop.  GPR was used first to identify anomalies, and the EM was used to confirm the GPR anomalies were metallic.  The study successfully identified 12 tanks at three different locations that were later removed.  Buried piping was abandoned in place.