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DDE.: Common name:DDE(p,p'-DDE; o,p'-DDE),product of DDT.degradation. <br /> Half-lives in the environment: <br /> Air: Atmos, transformation lifetime est.to be< 1 d. <br /> Surface water: Hydrolytic half-life of >120 yr,est. half-life>300 d in lakes. <br /> Groundwater:NIA <br /> Sediment:N/A <br /> Soil:Field half life of 1000 d <br /> Biota: Elimination half-life of 340 d(rainbow trout),300 d for birds. <br /> f. Environmental Fate Rate Constants or Half-Lives: t <br /> Volatilization:NIA <br /> Oxidation: NIA <br /> Hydrolysis: >120 yr <br /> Biodegradation:NIA <br /> DDD. Common name: DDD,TDE(tetrachlorodiphenylethane),product of DDT deg. <br /> Half-lives in the environment: <br /> Air:.17.7-177 h <br /> Surface water: 2-15.6 yr. Groundwater: 1680-270,000 h based on anaerobic soil study data <br /> Sediment:NIA: <br /> Soil: Field half life of 2-15.6 yrs based on observed rates of biodeg.of DDT <br /> Biota: 119 hr in mussels. <br /> Environmental Fate Rate Constants or Half-Fives: <br /> Volatilization: Aquatic approx. 1 mo. <br /> Oxidation:Aquatic half-life approx. 22 yr <br /> Hydrolysis;half-life of 570 d @ pH 9 and 190 yr @ pH 5 <br /> Biodegradation: Aqueous aerobic half-life of 2-15.6 yr <br /> Available Environmental Fate Data for the herbicide Roundup used on the property for the past three <br /> years was obtained from the U:C.'Davis and Oregon State University Extoxnet System, and is found <br /> in Appendix D. <br /> The following chart summarizes the Environmental Fate Data for Roundup. Noted times.of duration <br /> are maximum values observed. The Fate Data is highly specific for various environmental <br /> conditions, and is normally expressed as half-lives in terms of days. <br /> PESTIME,OR TYPE r" SOIL PERSISTENCE .WATER <br /> FERTILIZER APPLIED `' PERSISTENCE <br /> TO THE PROPERTY ; <br /> {Common Name} . , <br /> (RoundUp) Herbicide 1 - 174 days 12 - 70 days. Little <br /> Glyphosate risk to groundwater <br /> I <br /> f <br /> 1 <br /> Page -6- <br /> Chesney Consulting <br />