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6W June 15,2006 ion NOA Project Number: E06057A b. According to EXTOXNET,paraquat is an RUP and a highly toxic compound in EPA toxicity class I. The chemical is highly persistent in the soil environment,with reported field half-lives of greater than 1000 days. r According to EXTOXNET,methomyl is a broad spectrum insecticide classified as an RUP by the EPA because of its high acute toxicity to humans. Methomyl is highly soluble in water,has a soil IM half-life of 33 days, and its adsorption to soil particles is weak to moderate. Consequently, methomyl has been identified as a potential groundwater contaminant. According to EXTOXNET, diazinon is an organo-phosphate insecticide classified as slightly toxic to moderately toxic, depending on the formulation. Its average half-life in soil is two to four weeks. Diazinon has been detected in 54 wells in California. VAN According to the PMEP, fenpropathrin has a reported half- life of 33 to 34 days under aerobic soil conditions. "The end-use product (Danitol 2.4 EC Spray) has moderate to low acute oral, dermal, .o inhalation and eye/skin irritation toxicity." According to EXTOXNET, chlorpyrifos is a broad spectrum insecticide which is moderately toxic bw to humans. It adsorbs strongly to soil particles and is not readily soluble in water, so it is unlikely to leach to groundwater. The half-life of chlorpyrifos in soil is usually between 60 and 120 days, but can range from 2 weeks to over 1 year. VAN According to EXTOXNET, carbofuran is a broad spectrum carbamate pesticide. Liquid formulations of this chemical have been classified as RUPs because of their acute oral and hm inhalation toxicity to humans. Carbofuran is slightly to very mobile in soil (depending on the soil type) and has a half-life in soil of 30 to 120 days. It is soluble in water and has a high potential for groundwater contamination. According to EXTOXNET, lambda cyhalothrin is a synthetic pyrethroid insecticide and acaricide used to control a wide range of pests. It is moderately toxic in the technical form,but may be highly toxic via some routes in formulation. Lambda cyhalothrin is moderately persistent in the soil environment,with a field half-life close to 30 days in most soils. According to EXTOXNET,permethrin is a moderately to practically non-toxic pesticide in EPA toxicity class II or III, but is listed as an RUP because of its possible adverse effects on aquatic organisms. Permethrin is of low to moderate persistence in the soil environment,with reported half-lives of 30 to 38 days. 7