GSI utilizes Geoprobe equipment to collect sediment samples from the bottom of Baltimore’s Inner Harbor. The Geoprobe tooling was lowered through holes cored in a concrete industrial pier that extended out into Baltimore’s Inner Harbor. Once the bottom was encountered the tooling was advanced into the bottom sediments. A modified core catcher was utilized in the sample liners to allow the soft sediments to enter the sample barrel, but still prevent sample loss upon retrieval.