Determine the occurrence of contaminants in bed
sediments deposited in river channels.
Fine-grained sediments were collected and composited
from depositional zones at 23 surface-water sites during low-flow conditions.The composited bed-sediment sample was sieved and processed into several
subsamples for analysis.
Late summer and early fall of 1992 and 1993.
Targeted Physical and Chemical Data:
Trace elements, hydrophobic organic chemicals, total organic carbon, and particle size.
Organochlorine pesticides were detected in bed sediments.
The occurrence of these compounds in bed sediments was related to
land use. Concentrations were small in forested and rangeland areas and were higher in urban, agricultural, and mixed urban/agricultural