ENVS 4000 Assignment I - Hazard Assessment - updated

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Apr 3, 2024

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Page 1 of 6 ASSIGNMENT I HAZARD ASSESSMENT ENVS*4000 Toxicological Risk Characterization This assignment is worth 10% of your final grade and should be submitted to the Courselink dropbox by 11:59 pm on Sunday, January 28 th , 2024 (before midnight) . The total marks for this assignment are 61. You are advised to do any calculations etc., and even the entire answer, in rough before writing/typing it on the answer sheet. Marks will be deducted for poor grammar, syntax and spelling as well as for unclear or disorganized answers. Use only the space provided to respond. Name: __________________________________ Student Number: __________________________ HAZARD ASSESSMENT: PESTICIDES 1) You have been hired by Manitoba Sustainable Development to do Tier 1 Hazard Quotient (HQ) assessments for particular herbicides to primary producers, specifically algal and aquatic macrophyte species. You are provided with exposure data for several rivers in Manitoba [1], along with effects data for these chemicals [2, 3] (available in CourseLink). Use the effect measure from the most sensitive macrophyte (aquatic plant) and algae species for each herbicide. Do not use NOEC or LOEC data in your assessments. Based on the information provided to you, fill in the following tables: (40 marks) Macrophyte Assessments (each box is worth 0.25 marks) Chemical: Metolachlor Exposure Characterization Effects Characterization Hazard Characterization Location Conc. (µg/L) Plant Species Effect Measure Toxicity (µg/L) HQ Assinib. R. Pembina R. Seine R. Roseau R. Chemical: Atrazine Exposure Characterization Effects Characterization Hazard Characterization Location Conc. (µg/L) Plant Species Effect Measure Toxicity (µg/L) HQ Rat R. Red R. Seine R. Roseau R.
Page 2 of 6 Chemical: 2,4-D Exposure Characterization Effects Characterization Hazard Characterization Location Conc. (µg/L) Plant Species Effect Measure Toxicity (µg/L) HQ Assinib. R. Pembina R. Seine R. Roseau R. Chemical: Alachlor Exposure Characterization Effects Characterization Hazard Characterization Location Conc. (µg/L) Plant Species Effect Measure Toxicity (µg/L) HQ Assinib. R. Pembina R. Rat R. Red R. Algal Assessments Chemical: Metolachlor Exposure Characterization Effects Characterization Hazard Characterization Location Conc. (µg/L) Plant Species Effect Measure Toxicity (µg/L) HQ Seine R. Roseau R. Rat R. Red R. Chemical: Atrazine Exposure Characterization Effects Characterization Hazard Characterization Location Conc. (µg/L) Plant Species Effect Measure Toxicity (µg/L) HQ Seine R. Roseau R. Assinib. R. Pembina R.
Page 3 of 6 Chemical: 2,4-D Exposure Characterization Effects Characterization Hazard Characterization Location Conc. (µg/L) Plant Species Effect Measure Toxicity (µg/L) HQ Seine R. Roseau R. Rat R. Red R. Chemical: Alachlor Exposure Characterization Effects Characterization Hazard Characterization Location Conc. (µg/L) Plant Species Effect Measure Toxicity (µg/L) HQ Seine R. Roseau R. Assinib. R. Pembina R. 2) Based on the hazard quotients you have calculated above; do you anticipate any adverse effects for macrophytes or algae in these rivers from these herbicides? Be specific. (3 marks) 3) When giving your presentation to the public, you are challenged about the use of plant and algal species that are not native in your assessment. Give two brief counterpoints that might allay their fears. (2 marks)
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