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April 21, 2006 NOA Project.Number: E06022A property;only those containing clofentezme,fenpropathrm,diazinon,hydrogen applied to the subject pro ambda-cyhalothrin,and strychnine are cyanamide,paraquat dichloride,azinphos methyl,chlorpyrifos,.l RUPs. The U.C. Davis Extension Toxicology Network (EXTOXNET) web site" and the Pesticide Management Education Program(PMEP)at Cornell University web site' were consulted for additional information on these chemicals. According to information provided by the PMEP,technical clofentezine has a relatively low degree of acute toxicity by the oral,dermal,and inhalation routes of exposure. :However,the EPA has classified clo£entez ne as a likely human-carcinogen (Clofentezine (Apollo) Pesticide Tolerance 1999). 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, inhalation and eye/skin irritation toxicity" (Fenpropathrin (Danitol) Chemical Fact Sheet, 1989). IJ According to EXTOXNET,diazinon is an organo-phosphate RUP insecticide classified as slightly toxic 11 to moderately toxic, depending on the formulation. -Its average half-life in soil is two to four weeks } 1 Diazinon has been detected in 54 wells in California (PIP, 1993). ' According to EXTOXNET, hydrogen cyanamide:is a possible human carcinogen (Environmental t, M = - - t hether a Substance is a Carcinogen?,Allan Felsot, Toxicology Newsletter, How Does EPA Decide.W 1997). 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 1,000 days (1996). F According to EXTOXNET, all azinphos-methyl liquids with a concentration greater than 13.5% are classified as RUPs because of their acute toxicity and inhalation hazard. Azinphos-methyl is.highly toxic. The coinp ound generally has a short half-life(approximately 5 days)in soil,is relatively immobile 11 in soil,and has low leaching potential (PIP, 1996). EXTOXNET chlorpyrifos is a broad spectrum insecticide which is moderately toxic to �� According to ,rPy 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 Fifrom 2 weeks to over 1 year (PIP, 1993). 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 14University of California,Davis,Extension Toxicology Network(EXTOXNET), http://cxtoxnet.orst.edu/ghindex.htn-d. F115Cornell University;Pesticide Management Education Program,http://pmep.cce.corneR.edu/. =10 44 Fi