Supporting Information Tables

SI Table 1. (a) Water and Sediment LC50s used in Toxic Unit Calculations. LC50s are based on 96h water-only exposures of either Ceriodaphnia dubia or Hyalella azteca. See text for details.

Chemical / Endpoint/Criterion / Concentration (ng/L) / Reference
Organophosphates
Chlorpyrifos / C. dubia LC50 / 53 / (Bailey et al., 1997)
H. azteca LC50 / 86 / (Phipps et al., 1995)
Diazinon / C. dubia LC50 / 320 / (Bailey et al., 1997)
H. azteca LC50 / 6,510 / (Ankley et al., 1995)
Malathion / C. dubia LC50 / 2,120 / (Ankley et al., 1991)
Pyrethroids
Bifenthrin / C. dubia LC50 / 142 / (Wheelock et al., 2004)
H. azteca LC50 / 9.3 / (Anderson et al., 2006b)
Cyfluthrin / C. dubia LC50 / 344 / (Wheelock et al., 2004)
Cypermethrin / C. dubia LC50 / 683 / (Wheelock et al., 2004)
Lambda Cyhalothrin / C. dubia LC50 / 200 / (Wheelock et al., 2004)
H. azteca EC50 / 2.3 / (Weston and Jackson, 2009)
Permethrin / C. dubia LC50 / 250 / (Wheelock et al., 2004)
H. azteca LC50 / 21.1 / (Anderson et al., 2006b)
Organochlorines
pp DDE / H. azteca LC50 / 1390 / (Phipps et al., 1995)

(b) LC50s for H. azteca 10d exposures to whole sediment. See text for details.

Chemical / ng/g / μg/g oc / Endpoint / Reference
Organophosphates
Chlorpyrifos / 399 / 1.77 / LC50 / (Brown et al., 1997; Amweg and Weston, 2007)
Pyrethroids
Bifenthrin / 12.9 / 0.52 / LC50 / (Amweg et al., 2005)
Cyfluthrin / 13.7 / 1.08 / LC50 / (Amweg et al., 2005)
Cypermethrin / 14.87 / 0.38 / LC50 / (Maund et al., 2002)
Esfenvalerate / 41.8 / 1.54 / LC50 / (Amweg et al., 2005)
Lambda-Cyhalothrin / 5.6 / 0.45 / LC50 / (Amweg et al., 2005)
Permethrin / 200.7 / 10.83 / LC50 / (Amweg et al., 2005)
Organochlorines
Total DDT / 11000 / 367 / LC50 / (Nebeker et al., 1989) 3% TOC
49700 / 473 / LC50 / (Nebeker et al., 1989) 10.5% TOC
Metals (µg/g)
Copper / 260 / LC50 / (MPSL unpublished data)
Nickel / 521 / LC50 / (Liber et al., 2011)
Arsenic / 532 / LC50 / (Liber et al., 2011)

SI Table 2. Concentrations of total organic carbon (%) and detected* organic chemicals (ng/g) in Santa Maria River estuary and tributary sediments.

June 2008 / TOC (%) / Chlorpyrifos / Diazinon / Malathion / Phosmet / Bifenthrin / Cyfluthrin / Cyhalothrin / Cypermethrin / Danitol / Esfenvalerate / Fenvalerate / Permethrin / p p' DDD / p p' DDE / p p' DDT / Fipronil / Fipronil Sulfide / Dacthal / Oxyfluorfen / Napropamide / Prometryn / Propyzamide / Tau-Fluvalinate / Trifluralin / 3,5 DCA
Santa Maria 1 / 0.17 / 0.2
Santa Maria 2 / 0.08
Santa Maria 3 / 1.13 / 0.5 / 2.6 / 3.7
Santa Maria 4 / 0.33 / 0.5 / 0.7
Santa Maria 5 / 1.00 / 1.4 / 2.0 / 10.5 / 3.5 / 0.4 / 2.5
Santa Maria 6 / 1.37 / 18.7 / 2.5 / 8.0 / 31.0 / 7.3 / 1.4 / 9.1
Santa Maria 7 / 1.39 / 7.2 / 1.0 / 3.8 / 14.6 / 6.0 / 1.7 / 11.0
Santa Maria 8 / 1.74 / 23.2 / 1.2 / 3.8 / 8.4 / 18.8 / 79.3 / 36.5 / 1.6 / 61.9 / 14.2
Orcutt Creek / 1.47 / 14.5 / 0.9 / 1.3 / 7.4 / 15.0 / 62.1 / 28.5 / 0.7 / 38.2 / 7.2 / 2.1 / 12.2 / 1.4 / 0.2
October 2008
Santa Maria 1 / 1.12 / 2.2 / 1.4 / 7.6 / 1.2 / 0.2 / 1.2
Santa Maria 2 / 2.17 / 5.0 / 1.7 / 1.5 / 2.4 / 4.0 / 12.0 / 3.4 / 0.8 / 1.4 / 1.1 / 9.0 / 0.7
Santa Maria 3 / 3.32 / 4.1 / 0.2 / 1.3 / 0.0 / 3.5 / 15.3
Santa Maria 4 / 1.97 / 9.1 / 1.3 / 2.0 / 8.3 / 47.3 / 10.1 / 0.6 / 3.1 / 4.6
Santa Maria 5 / 1.9 / 12.7 / 1.4 / 2.4 / 2.4 / 10.2 / 54.8 / 11.7 / 0.6 / 14.4 / 6.4
Santa Maria 6 / 2.44 / 10.1 / 1.1 / 2.0 / 8.3 / 40.6 / 10.9 / 0.5 / 11.5 / 4.6 / 4.1
Santa Maria 7 / 1.55 / 10.8 / 1.1 / 0.9 / 6.9 / 41.1 / 6.5 / 2.7 / 3.5 / 0.8
Santa Maria 8 / 2.66 / 23.1 / 4 / 6.3 / 3.7 / 1.4 / 6.8 / 19.8 / 88.8 / 23.1 / 1.1 / 29.0 / 1.3 / 0.2 / 3.1
Orcutt Creek / 1.33 / 43.7 / 1.0 / 2 / 3.9 / 3.1 / 0.9 / 17.3 / 80.8 / 32.7 / 0.8 / 60.2 / 4.2 / 0.4
October 2009
Santa Maria 1 / 0.29 / 0.3
Santa Maria 2 / 0.26 / 0.3
Santa Maria 3 / 3.33 / 1.2 / 0.5
Santa Maria 4 / 1.36 / 0.4 / 3.4 / 1.1 / 0.4 / 1.8
Santa Maria 5 / 0.16 / 1.5 / 0.8
Santa Maria 6 / 1.68 / 4.0 / 5.5 / 29.9 / 4.5 / 0.6 / 3.0 / 0.1
Santa Maria 7 / 2.93 / 7.6 / 5.2 / 25.2 / 6.0 / 0.8 / 1.6 / 0.2
Santa Maria 8 / 2.49 / 27.3 / 1.3 / 1.7 / 18.6 / 0.7 / 3.2 / 1.3 / 0.6 / 6.2 / 10.2 / 50.8 / 10.8 / 1.68 / 22.8 / 0.8
Orcutt Creek / 1.76 / 51.8 / 2.0 / 2.1 / 15.2 / 68.0 / 21.1 / 0.9 / 43.8 / 1.9 / 2.5

*detected compounds out of 59 total compounds measured