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Bed Sediment and Tissue

Occurrence and Distribution Assessment

The "Occurrence and Distribution Assessment" is the largest and most important component of the three-year intensive-study phase.  As part of this Assessment, the Santa Ana NAWQA study team has obtained samples from 12 "Bed-Sediment and Tissue" (BST) sites.  These samples have been analyzed for trace elements and organic compounds.

Of the 12 BST sites, 8 are located in the Inland Santa Ana Basin, 2 in the Coastal Santa Ana Basin, and 2 in the San Jacinto Basin. Of the 12 sites, 4 will be located along reaches in the uplands and 8 will be located in the alluvial-filled valleys and coastal plain.  Although BST samples are typically obtained at all fixed sites (BFS and IFS), the Santa Ana NAWQA study team has done so at only 6 of the 7 fixed-sites.  BST samples were not collected at the fixed sites located on Cucamonga Creek because the channels are concrete-lined and do not accumulate sediment. Bed sediment only was collected at 2 sites, Warm Creek and San Jacinto River nr San Jacinto, as the streamflow was too low to support a fish population. 

A detailed bed sediment and tissue report was published in 2002 titled, Effects of Urbainization and Long-Term Rainfall on the Occurrence of Orgainic Compounds and Trace Elements in Reservoir Sediment Cores, Streambed Sediment, and Fish Tissue from the Santa Ana River Basin, California, 1998.  View report by Carmen Burton, 2002

A related study involved testing the relationship of mercury and methylmercury in aquatic ecosystems by sampling water, sediment, and fish tissue. See the conference paper by: Brumbaugh, William G., Krabbenhoft, David P., Helsel, Dennis R., Wiener, James G., 2000, A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients: Bioaccumulation in Fishes; Presented at the 21st annual meeting of the Society of Environmental Toxicology and Chemistry (SETAC), Nashville, TN, November 12-16, 2000. (view paper).  For more information please contact william_brumbaugh@usgs.gov.
 
Location of Bed Sediment and Tissue Sites

For more information on each site, see below: 

South Fork Santa Ana River
South Fork Santa Ana River (1)
Bear Creek near Bear Creek Campground near Angelus Oaks
Bear Creek near Bear Creek Campground near Angelus Oaks (2)
Santa Ana River at Upper PH near Running Springs
Santa Ana River at Upper PH near Running Springs (3)
Warm Creek near San Bernardino
Warm Creek near San Bernardino (4)
Santa Ana River at MWD Crossing
Santa Ana River at MWD Crossing (5)
  Santa Ana River at Hamner Road
Santa Ana River at Hamner Road (6)
Mill Creek at Chino Corona Road near Norco
Mill Creek at Chino Corona Road near Norco (7)
Chino Creek below Central Avenue
Chino Creek below Central Avenue (8)
San Jacinto River near San Jacinto
San Jacinto River near San Jacinto (9)
San Jacinto River near Elsinore
San Jacinto River near Elsinore (10)
Santa Ana River below Prado Dam
Santa Ana River below Prado Dam (11)
 Santa Ana River at Imperial Highway (12)

 

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Robert Kent, USGS hydrologic technician, collecting fine sediment samples for organic and trace element analysis using a teflon spoon.
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Jason May, USGS biologist, sieving sediment sample through a 2mm stainless steel sieve in preparation for shipping to the National Water Quality Laboratory (NWQL) for organic analysis.
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Robert Kent and Jason May sieving sediment sample through a 63 um nylon mesh in preparation for analysis by the NWQL.
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Steve Groodbred, biologist with the Biological Resources Division (BRD), using an electrofisher to temporarily stun fish.
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Greg Mendez, USGS hydrologist, collects stunned fish with a dip net.
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Fish are checked for external anomalies such as lesions, deformities, parasites, tumors and eroded fins.
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Fish are weighed, measured for total and standard length, and checked for gender. A composite of 5 whole body fish are sent to the NWQL to be analyzed for hydrophobic organic compounds. 
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Liver tissue is used for trace element analysis. A composite of liver tissue from at least 5 fish is collected and shipped to the NWQL for analysis.
(Photos by Carmen Burton, USGS)

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Page Last Modified: Friday, 23-Dec-2016 13:44:15 EST