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L � <br /> L August 16, 2004 <br /> NOA Project Number: E04095A <br /> `, Chemical Name Active Ingredient 99 00 01 02 03 04 <br /> Roundup Ultra Herbicide Glyphosate, X X <br /> 6. isopropylamine salt <br /> Roundup UltraMax Glyphosate, X <br /> L isopropylamine salt <br /> Red-Top Dusting Sulfur Sulfur X X <br /> ►. Weedar 64 herbicide 2,4-D dimethylamine X X X <br /> salt <br /> L Of the chemicals reportedly applied to the subject property, only atrazine has been classified as <br /> a Restricted Use Pesticide (RUP). Information obtained from the U.C. Davis Extension <br /> Toxicology Network (EXTOXNET) indicates that atrazine is listed as an RUP even though it <br /> L is only slightly toxic (toxicity class III) because of its potential for groundwater contamination. <br /> A 1996 article published by EXTOXNET describes the environmental fate of atrazine as follows: <br /> Atrazine is highly persistent in soil. Chemical hydrolysis,followed by degradation by <br /> soil microorganisms, accounts for most of the breakdown of atrazine. Hydrolysis is <br /> 1. rapid in acidic or basic environments,but is slower at neutral pHs.Addition oforganic <br /> material increases the rate of hydrolysis. Atrazine can persist for longer than 1 year <br /> under dry or cold conditions... Atrazine is moderately to highly mobile in soils with <br /> L low clay or organic matter content.Because it does not adsorb strongly to soil panicles <br /> and has a lengthy half-life(60 to >100 days), it has a high potential for groundwater <br /> L contamination despite its moderate solubility in water... Atrazine is the second most <br /> common pesticide found in private wells and in community wells[16J. Trace amounts <br /> have been found in drinking water samples and in groundwater samples in a number <br /> of states... A 5-year survey of drinking water wells detected atrazine in an estimated <br /> 1.7%ofcommunity water systems and 0.7916of rural domestic wells nationwide.Levels <br /> detected in rural domestic wells sometimes exceeded the MCL' ... The recently <br /> Lcompleted National Survey of Pesticides in Drinking Water found atrazine in nearly <br /> 1%of all of the wells tested... <br /> L <br /> ` 'Maximum Contaminant Level <br /> 9 <br /> 6. .,44 <br /> L <br />