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Maximum concentrations at: Number of detections at:
------------------------------- --------------------------------------
Method Irrigated Dryland Irrigated Dryland
detection ------------ --------------- -------------- ---------------
limit or EL68D Crab Upper EL68D Crab Upper Palouse
reporting Waste- Creek Crab Palouse All Waste- Creek Crab River
Pesticide or Trade level Criteria1 way Lateral Creek River way Lateral Creek
metabolite (m) name (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L)
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Herbicides:
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Atrazine AAtrex 0.009 22 0.02 0.05 0.03 0.2 79 25 29 2 23
Simazine Aquazine 0.005 310 0.019 0.073 0.042 0.069 77 19 21 13 24
DCPA Dacthal 0.002 -- 8.1 0.99 0.002 0.006 61 27 21 1 12
EPTC Eptam 0.002 -- 0.41 1.8 0.008 0.012 53 25 20 1 7
Desethylatrazine4(m) none 0.002 -- e0.01 e0.02 e0.005 e0.006 45 11 23 2 9
Metolachlor Dual 0.002 58 0.019 0.042 - 0.004 40 19 18 0 3
Terbacil4 Sinbar 0.007 -- e0.6 e0.7 - - 40 21 19 0 0
Alachlor Lasso 0.002 -- 0.3 0.03 0.01 0.006 38 25 10 1 2
Metribuzin Lexone 0.004 51 0.1 0.022 - 0.052 33 16 8 0 9
2,4-D several 0.035 33 1.3 1.7 0.24 0.15 30 12 13 2 3
Triallate Far-Go 0.001 50.24 - - a0.65 a0.49 30 0 0 6 24
Trifluralin Treflan 0.002 20.1 0.096 0.01 - 0.007 26 15 10 0 1
Pendimethalin Prowl 0.004 -- 0.19 0.016 - - 25 15 10 0 0
Prometon Pramitol 0.018 -- - 0.008 0.01 0.058 20 0 2 1 17
Ethalfluralin Sonalan 0.004 -- 0.038 0.028 - 0.013 13 7 5 0 1
Diuron Karmex 0.02 31.6 0.33 0.39 0.07 0.47 12 6 2 1 3
Bentazon Basagran 0.014 -- 0.14 0.11 - - 10 3 7 0 0
Cyanazine Bladex 0.004 52 0.04 0.014 - - 9 6 3 0 0
Butylate Sultan + 0.002 -- 0.006 0.007 - - 9 6 3 0 0
Tebuthiuron Spike 0.01 -- - 0.028 - 0.01 6 0 1 0 5
MCPA Metaxon 0.05 -- - - - 0.24 5 0 0 0 5
Bromoxynil Buctril 0.035 25 0.09 - - 0.6 5 3 0 0 2
Linuron Lorox 0.002 -- 0.009 0.022 - - 5 1 4 0 0
Napropamide Devrinol 0.003 -- 0.007 0.017 - - 3 1 2 0 0
Propanil Stampede 0.004 -- - 0.014 - - 2 0 2 0 0
Thiobencarb Bolero 0.002 -- - 0.005 - - 2 0 2 0 0
Propham Chem-Hoe 0.035 -- 0.06 - - - 1 1 0 0 0
Propachlor Ramrod 0.007 -- - 0.002 - - 1 0 1 0 0
Benfluralin Balan 0.002 -- - 0.003 - - 1 0 1 0 0
Dacthal, mono- none 0.017 -- 0.04 - - - 1 1 0 0 0
acid
Insecticides:
------------
Chlorpyrifos Lorsban 0.004 60.041 a0.066 a0.12 - - 28 13 15 0 0
Propargite Comite 0.013 -- 1.4 0.12 - - 26 20 6 0 0
Dieldrin7 Panoram D-31 0.001 60.065 h0.016 h0.01 - h0.01 25 15 8 0 2
Azinphos-methyl4Guthion 0.001 60.01 ea0.5 ea0.2 ea0.04 - 16 3 12 1 0
Carbofuran4 Furadan 0.003 21.75 e0.1 e0.006 - - 12 11 1 0 0
Ethoprop Mocap 0.003 -- 0.007 0.12 - 0.005 11 4 5 0 2
Carbaryl4 Sevin 0.003 30.02 0.004 e0.1 e0.02 - 11 1 8 2 0
gamma-HCH Lindane 0.004 60.08 - - - 0.036 9 0 0 0 9
Diazinon several 0.002 30.009 a0.052 a0.018 - a0.012 7 4 2 0 1
Malathion several 0.005 60.1 0.019 0.025 - - 5 3 2 0 0
Disulfoton Di-Syston 0.017 30.05 0.035 0.011 - - 5 3 2 0 0
p,p'-DDE (m) none 0.006 -- - 0.008 - - 4 0 4 0 0
Fonofos Dyfonate 0.003 -- 0.013 - - - 3 3 0 0 0
cis-Permethrin Ambush 0.005 -- - e0.01 - - 1 0 1 0 0
alpha-HCH7 none 0.002 -- - - - h0.007 1 0 0 0 1
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Number of samples analyzed 104 29 29 19 27
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1 Freshwater-chronic criteria for the protection of aquatic life
2 Guidelines are freshwater-chronic criteria for the protection of freshwater aquatic life from Canadian Water Quality Guidelines prepared by Canadian Council of Ministers of the Environment (1993)
3 Freshwater-chronic criteria for the protection of aquatic life recommended by National Academy of Sciences and National Academy of Engineers (1973) from Nowell and Resek(1994)
4 Concentrations for these pesticides are qualitatively identified
5 Interim guidelines for the protection of aquatic life are Canadian Water Quality Guidelines from Canadian Council of Ministers of the Environment (1993)
6 U.S. Environmental Protection Agency freshwater-chronic ambient-water-quality criteria for protection of aquatic life, from Nowell and Resek (1994)
7 Dieldrin and alpha-HCH were detected at concentrations above their USEPA health advisories for drinking water (0.002 ug/L and 0.006 ug/L, respectiviely), from Nowell and Resek (1994)