Analysis of Pesticides in Surface Water and Sediment from Yolo Bypass, California, 2004–2005
By Kelly L. Smalling, James L. Orlando, and Kathryn M. Kuivila
Scientific Investigations Report 2005-5220, published 2005.
Table 8
Total organic carbon and pesticide concentrations detected in water and suspended sediments collected from the Yolo Bypass, California, in 2004 and 2005.
[ ng/L , nanogram per liter (for concentrations detected in water); µg/kg , microgram per kilogram (for suspended sediments)]
Site Date (mm/dd/yy) Time (hh:mm) Sample type Organic carbon (%) Bifenthrin Chlorpyrifos- Diazinon Hexazinone Methidathion- Metolachlor Molinate Oxyfluorfen
Knights Landing Ridge Cut 2/20/04 15;30 Water na nd nd 160 987 30.3 32.2 24.2 56.6
  1/03/05 11:00 Water na nd nd nd 300 nd 21.9 8.1 14.7
                         
Putah Creek 2/20/04 13:20 Water na nd nd nd 14.4 nd nd nd nd
                         
Willow Slough 1/03/05 13:00 Water na nd nd nd 9210 nd 74.9 nd 27.1
                         
Knights Landing Ridge Cut 2/20/04 15:30 Suspended sediment 1.2 nd nd nd nd nd (0.4) 2.4 16.3
  1/03/05 11:00 Suspended sediment 1.3 nd (0.5) nd nd nd (1.2) 4.5 26.4
                         
Putah Creek 2/20/04 13:20 Suspended sediment 1.5 nd nd nd nd nd nd nd nd
                         
Willow Slough 1/03/05 13:00 Suspended sediment 2.1 (1.7) 1.3 nd 9.4 nd 3.9 nd 50.1
                         
                         
Site Date (mm/dd/yy) Time (hh:mm) Sample type Organic carbon (%) Pendimethalin- Simazine Tau-fluvalinate Thiobencarb Trifluralin p,p′ DDD p,p′ DDE p,p′ DDT
Knights Landing Ridge Cut 2/20/04 15:30 Water na 11.1 511 nd 26.9 9.6 nd nd nd
  1/03/05 11:00 Water na 9.5 189 nd nd nd nd nd nd
                         
Putah Crk 2/20/04 13:20 Water na nd 45.6 nd nd nd nd nd nd
                         
Willow Slough 1/03/05 13:00 Water na 3.8 128 nd nd 17.4 nd nd nd
                         
                         
Knights Landing Ridge Cut 2/20/04 15:30 Suspended sediment 1.2 2.7 nd 1.4 11.7 (0.9) (0.9) 2.8 nd
  1/03/05 11:00 Suspended sediment 1.3 8.3 nd 11.1 24.3 2.4 2.4 2.8 1.9
                         
Putah Creek 2/20/04 13:20 Suspended sediment 1.5 1.7 nd nd nd 1.5 (1.1) 4.3 (1.3)
                         
Willow Slough 1/03/05 13:00 Suspended sediment 2.1 2.8 nd 2.7 1.7 5.0 1.5 4.0 nd