USACE Charleston District survey team helps maintain South Carolina waterways
Sonja Zindars, a geographer with the U.S. Army Corps Of Engineers Charleston District, prepares to retrieve a Castaway CTD from the water. The device measures conductivity, temperature, and depth to determine a speed of sound change throughout the water column.

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Photo by: Jackie Pennoyer |  VIRIN: 211103-A-FL655-002.JPG