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Water-Quality Assessment of the Sacramento River
Basin, California: Water-Quality, Sediment and Tissue
Chemistry, and Biological Data, 1995-1998
(Open-File Report 2000-391)

Quality Control
Replicate Data: Surface Water

Surface-water replicate frequency table for total mercury and methylmercury

This table describes for the frequency of replicate sample collection for mercury and methylmercury at surface-water sites.

Site Identification USGS Site Number Date Time Mercury in Unfiltered Water Methylmercury in Unfiltered Water
Sacramento River at Freeport, CA 11447650 2/20/96 1010 X  
American River at Sacramento CA 11447000 2/21/96 1010 X  
Sacramento River at Verona, CA 11425500 2/22/96 1020   X
Feather River near Nicolaus, CA 11425000 2/23/96 1020 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 3/6/96 1030   X
Cache Creek at Rumsey CA 11451800 3/7/96 1340 X  
Sacramento Slough near Knights Landing, CA 11391100 3/11/96 1300 X  
American River at Sacramento CA 11447000 4/5/96 0940 X  
Sacramento Slough near Knights Landing, CA 11391100 4/22/96 1100 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 4/23/96 1030   X
Cache Creek at Rumsey CA 11451800 4/25/96 1230 X  
American River at Sacramento CA 11447000 5/15/96 1030 X  
Arcade Creek near Del Paso Heights CA 11447360 5/21/96 1040 X  
Sacramento Slough near Knights Landing, CA 11391100 5/23/96 1030   X
Cache Creek at Rumsey CA 11451800 5/29/96 1100 X  
Sacramento River at Freeport, CA 11447650 6/10/96 1100 X  
Sacramento River at Colusa, CA 11389500 6/17/96 1100 X X
Cache Creek at Rumsey CA 11451800 6/26/96 1200 X  
Sacramento River at Freeport, CA 11447650 7/17/96 1100   X
Arcade Creek near Del Paso Heights CA 11447360 7/23/96 1430 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 7/23/96 1000 X  
Yuba River at Marysville, CA 11421500 7/25/96 1100 X  
Yuba River at Marysville, CA 11421500 8/12/96 1100 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 8/27/96 1000   X
Cache Creek at Rumsey CA 11451800 8/28/96 1230 X  
Sacramento River above Bend Bridge near Red Bluff, CA 11377100 8/29/96 1030 X  
Feather River near Nicolaus, CA 11425000 9/11/96 1030 X  
American River at Sacramento CA 11447000 9/13/96 0930 X  
Sacramento River at Freeport, CA 11447650 9/24/96 1130 X  
Sacramento River at Verona, CA 11425500 9/26/96 1200   X
Feather River near Nicolaus, CA 11425000 10/7/96 1040 X  
Sacramento River at Verona, CA 11425500 10/7/96 1300 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 10/18/96 0950   X
Sacramento River above Bend Bridge near Red Bluff, CA 11377100 10/23/96 1020 X  
Feather River near Nicolaus, CA 11425000 11/5/96 1030 X  
Sacramento River at Verona, CA 11425500 11/13/96 1030 X  
Sacramento River above Bend Bridge near Red Bluff, CA 11377100 11/22/96 1330 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 12/3/96 1000 X  
Cache Creek at Rumsey CA 11451800 12/13/96 1240 X  
Sacramento River at Verona, CA 11425500 12/18/96 1100   X
Sacramento River at Verona, CA 11425500 3/12/97 1400   X
Sacramento River at Colusa, CA 11389500 3/13/97 1100 X  
Yuba River at Marysville, CA 11421500 3/14/97 1030 X  
Cache Creek at Rumsey CA 11451800 3/19/97 1120 X  
Arcade Creek near Del Paso Heights CA 11447360 4/10/97 1030 X  
Sacramento River at Colusa, CA 11389500 4/16/97 1240 X  
American River at Sacramento CA 11447000 4/25/97 0920 X  
Sacramento Slough near Knights Landing, CA 11391100 4/29/97 1040   X
Yuba River at Marysville, CA 11421500 5/13/97 1100 X  
Sacramento River at Verona, CA 11425500 5/14/97 1340   X
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 5/23/97 1030 X  
Cache Creek at Rumsey CA 11451800 5/27/97 1350 X  
American River at Sacramento CA 11447000 6/12/97 0920 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 6/17/97 1000   X
Feather River near Nicolaus, CA 11425000 6/19/97 1020 X  
Sacramento Slough near Knights Landing, CA 11391100 6/19/97 1200 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 7/10/97 0940 X  
Arcade Creek near Del Paso Heights CA 11447360 7/11/97 0900 X  
Sacramento River at Freeport, CA 11447650 7/14/97 1230   X
Yuba River at Marysville, CA 11421500 7/16/97 1150 X  
Sacramento Slough near Knights Landing, CA 11391100 8/13/97 1030 X  
Feather River near Nicolaus, CA 11425000 8/14/97 1100 X  
Sacramento River at Colusa, CA 11389500 8/18/97 1120   X
American River at Sacramento CA 11447000 8/19/97 0930 X  
American River at Sacramento CA 11447000 9/15/97 1230 X  
Cache Creek at Rumsey CA 11451800 9/16/97 1150 X  
Sacramento River at Freeport, CA 11447650 9/23/97 1030   X
Arcade Creek near Del Paso Heights CA 11447360 10/17/97 1020 X  
American River at Sacramento CA 11447000 10/24/97 0900 X  
Sacramento River at Verona, CA 11425500 10/29/97 1100 X  
Sacramento Slough near Knights Landing, CA 11391100 10/29/97 1000   X
Cache Creek at Rumsey CA 11451800 11/18/97 1300 X  
Sacramento River at Freeport, CA 11447650 11/20/97 1130   X
Feather River near Nicolaus, CA 11425000 11/24/97 1000 X  
Sacramento Slough near Knights Landing, CA 11391100 11/25/97 1000 X  
Sacramento River above Bend Bridge near Red Bluff, CA 11377100 12/10/97 1000 X  
Sacramento River at Verona, CA 11425500 12/16/97 1230 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 12/17/97 1040   X
Arcade Creek near Del Paso Heights CA 11447360 12/19/97 0950 X  
Arcade Creek near Del Paso Heights CA 11447360 1/9/98 0930 X  
Sacramento River at Colusa, CA 11389500 1/13/98 1150 X  
Cache Creek at Rumsey, CA 11451800 1/20/98 1300 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 1/21/98 1030   X
Yuba River at Marysville, CA 11421500 2/10/98 1120 X  
Sacramento River at Colusa, CA 11389500 2/11/98 1300   X
Sacramento River above Bend Bridge near Red Bluff, CA 11377100 2/18/98 1230 X  
Sacramento Slough near Knights Landing, CA 11391100 2/25/98 1100 X  
Sacramento River at Freeport, CA 11447650 3/19/98 1100 X  
Feather River near Nicolaus, CA 11425000 3/24/98 1100 X  
Sacramento River at Verona, CA 11425500 3/25/98 1300   X
Cache Creek at Rumsey, CA 11451800 3/26/98 1040 X  
Yuba River at Marysville, CA 11421500 4/6/98 1100 X  
Colusa Basin Drain at Rd. 99E near Knights Landing, CA 11390890 4/15/98 1130   X
Sacramento Slough near Knights Landing, CA 11391100 4/22/98 1000 X  
Arcade Creek near Del Paso Heights CA 11447360 4/23/98 1000 X