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 5
Pesticide concentrations detected in surface water samples collected in 2004 from six source watersheds and two sites within the Yolo Bypass, California.
[Site names are abbreviated; for complete names, see table 2. Pesticide concentrations in nanogram per liter. Samples were analyzed for the following pesticides that were not detected: Alachlor, Atrazine, Butylate, Carbofuran, Chlorpyrifos, Cycloate, DCPA, Ethalfluralin, Malathion, Methyl parathion, Pebulate, Phosmet, Piperonyl butoxide, and Prometryn. hh:mm, hours:minutes; mm/dd/yy, month/day/year; nd, not detected; ( ), concentrations less than MDL and are estimated values]
Site Date (mm/dd/yy) Time (hh:mm) Carbaryl Diazinon EPTC Hexazinone Methidathion Metolachlor Molinate
Cache Creek 2/19/2004 14:00 nd nd nd 19.4 nd nd nd
  2/26/2004 09:10 nd nd nd 46.4 nd 3.5 nd
  3/04/2004 10:50 nd nd nd 7.7 nd nd nd
  3/11/2004 11:00 nd nd nd 6.0 nd nd nd
                   
Knights Landing Ridge Cut 2/19/2004 14:35 nd 157 nd 947 39.5 22.8 12.5
  2/26/2004 08:40 nd 41.7 nd 315 nd 10.4 27.7
  3/04/2004 11:05 nd 40.8 nd 409 nd 26.9 20.4
  3/11/2004 11:15 nd 20.7 nd 271 nd 23.3 23.7
                   
Putah Creek 2/19/2004 10:45 nd nd nd 15.2 nd nd nd
  2/26/2004 10:15 nd nd nd 10.8 nd nd nd
  3/04/2004 09:20 nd nd nd nd nd nd nd
  3/11/2004 10:15 nd nd nd nd nd nd nd
  3/17/2004 11:10 nd nd nd nd nd nd nd
  3/23/2004 10:45 nd nd nd nd nd nd nd
  3/29/2004 10:45 nd nd nd nd nd nd nd
  4/05/2004 08:50 nd nd nd nd nd nd nd
  4/12/2004 12:00 nd nd nd nd nd 8.6 nd
  4/21/2004 12:10 nd nd nd 14.9 nd nd nd
                   
Sacramento River 2/19/2004 15:00 nd 28.1 nd 31.6 nd nd nd
  2/26/2004 08:05 nd nd nd 32.3 nd (1.7) nd
  3/4/2004 11:35 nd 4.1 nd 17.3 nd 4 nd
  3/11/2004 11:45 nd (3.4) nd 10.9 nd nd nd
                   
Sacramento Slough 2/19/2004 15:25 nd 11.9 11.4 328 nd 24.5 33.3
  2/26/2004 07:35 nd nd nd 17.5 nd nd nd
  3/4/2004 12:00 nd (0.2) nd 22.7 nd nd nd
  3/11/2004 12:20 nd nd nd 15.0 nd 3.9 nd
                   
Toe Drain 3/11/2004 09:30 nd 10.1 nd 167 nd 20.8 15.4
  3/17/2004 13:05 nd 4.0 nd 87.5 nd 24.2 8.6
  3/23/2004 12:15 nd 5.7 nd 56.9 nd 22.1 nd
  3/29/2004 12:00 41.3 nd nd 57.9 nd 113 nd
  4/05/2004 09:40 nd (0.9) nd 66.1 nd 55.1 nd
  4/12/2004 13:05 nd nd nd 70.9 nd 265 nd
  4/21/2004 13:10 nd nd 32.0 196 nd 367 9.4
                   
Willow Slough 2/19/2004 12:50 nd 12.2 nd 2539 nd 28.9 nd
  2/26/2004 09:50 nd 96.4 nd 1556 nd 49.5 nd
  3/04/2004 10:19 nd nd nd 369 nd 13.5 nd
  3/11/2004 10:35 nd nd nd 318 nd 10.7 nd
                   
Yolo Pond 2/19/2004 11:45 nd 16.0 nd 89.8 nd nd nd
  3/17/2004 12:00 nd nd nd 174 nd 7.2 nd
  3/23/2004 11:30 nd nd nd 314 nd 9.6 nd
  3/29/2004 11:30 nd nd nd 365 nd 9.9 nd
  4/05/2004 09:25 nd nd nd 352 nd 9.9 nd
  4/12/2004 12:30 nd nd nd 403 nd 11.6 nd
  4/21/2004 12:40 nd nd nd 368 nd 6.3 nd
                   
Site Date (mm/dd/yy) Time (hh:mm) Napropamide Oxyfluorfen Pendimethalin Simazine Thiobencarb Trifluralin  
Cache Creek 2/19/2004 14:00 nd nd nd 43.3 nd nd
  2/26/2004 09:10 nd nd nd 24.4 nd 9.8
  3/04/2004 10:50 nd nd nd 30.5 nd nd
  3/11/2004 11:00 nd nd nd 20.8 nd nd
                 
Knights Landing Ridge Cut 2/19/2004 14:35 38.4 nd 8.0 604 27.3 nd
  2/26/2004 08:40 nd nd nd 457 30.9 9.1
  3/04/2004 11:05 nd nd nd 394 32.4 12.4
  3/11/2004 11:15 nd nd nd 266 25.3 nd
                 
Putah Creek 2/19/2004 10:45 nd nd nd 41.9 nd nd
  2/26/2004 10:15 nd nd nd 84.0 nd nd
  3/04/2004 09:20 nd nd nd 35.3 nd nd
  3/11/2004 10:12 nd nd nd 35.1 nd nd
  3/17/2004 11:10 nd nd nd 39.6 nd nd
  3/23/2004 10:45 nd nd nd 33.6 nd nd
  3/29/2004 10:45 nd nd nd 30.3 nd nd
  4/05/2004 08:50 nd nd nd 28.0 nd nd
  4/12/2004 12:00 nd nd nd 29.4 nd 11.2
  4/21/2004 12:00 nd nd nd 26.8 nd 4.1
                 
Sacramento River 2/19/2004 15:00 nd nd nd 106 nd nd
  2/26/2004 08:05 nd nd nd 27.1 nd nd
  3/04/2004 11:35 nd nd nd 43.0 nd nd
  3/11/2004 11:45 nd nd nd 15.9 nd nd
                 
Sacramento Slough 2/19/2004 15:25 nd 48.6 nd 84.8 24.6 5.4
  2/26/2004 07:35 nd nd nd nd nd nd
  3/04/2004 12:00 nd nd nd 49.1 nd nd
  3/11/2004 12:20 nd nd nd 22.4 nd nd
                 
Toe Drain 3/11/2004 09:30 nd nd nd 164 nd 4.1
  3/17/2004 13:05 nd nd nd 90.1 15.3 9.4
  3/23/2004 12:15 nd nd nd 51.7 12.1 9.1
  3/29/2004 12:00 nd nd 9.7 44.2 nd 4.4
  4/05/2004 09:40 nd nd 21 73.8 8.8 nd
  4/12/2004 13:05 nd nd 8.5 50.7 10.3 6.5
  4/21/2004 13:10 nd nd nd 45.9 12.8 12.5
                 
Willow Slough 2/19/2004 12:50 nd 39.5 nd 85.6 nd 66.4
  2/26/2004 09:50 78.8 71.1 nd 148 nd 56.8
  3/04/2004 10:19 nd 15.3 nd 36.3 18.4 12.5
  3/11/2004 10:35 nd 30.6 nd 23.8 9.3 9.8
                 
Yolo Pond 2/19/2004 11:45 nd nd nd nd nd nd
  3/17/2004 12:00 nd nd nd 61.7 nd nd
  3/23/2004 11:30 nd nd nd 49.0 nd nd
  3/29/2004 11:30 nd nd nd 34.0 nd 4.8
  4/05/2004 09:25 nd nd nd 24.4 nd nd
  4/12/2004 12:30 nd nd nd 20.0 nd nd
  4/21/2004 12:40 nd nd nd 26.0 nd nd