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rCFECIDE APPLIED TYPE` - SOIL.PERSISTENCE. WATER. <br /> HE PROPERTY,:, <br /> a`PERSISTENCE <br /> e <br /> (Common;Name) <br /> _ , <br /> Glyphosate- Herbicide 1 - 174 days 12-70-days <br /> Oxyflurofen. Herbicide 30-40 days Unknown <br /> Tritluralin Herbicide 45-60 days/6-8 months Unknown <br /> j, Pesticides with long half--lives that may have been.used-or drifted onto the property decades ago, <br /> primarily DDT,tray be of an extremely.slight concern. DDT was used extensively throughout the <br /> agricultural fields of the San Joaquin Valley and degradates of DDT can be found in nearly all these <br /> soils. Previous Exposure Assessments made on-typical.San Joaquin Val ley.soiIs suggest an <br /> extremely low probability of adverse health effects from soil DDT/DDD and DDE concentrations <br /> (if the concentrations even exist): The environmental fate data are presented below for DDT, and its <br /> degradates DDD and DDE. <br /> DDT. Common name: Agritan,Anofex, Azotox,et al. <br /> Half--lives in the environment: <br /> Air: 17:7=177 h. <br /> Surface water:.73.9 b for a pond 1 m deep. Degradation half-life of about 10 yr-average from loss <br /> rates determined in Lake Michigan. <br /> Groundwater: 16 d to'31.3 yr. <br /> Sediment: 3 to.5 yr <br /> Soil: 2-15.6 yrs based on observed rates of biodegradation in aerobic soils under field conditions. <br /> Avg. half life of--12 yrs in 3 different-soils for--50 ppm in soii.(conversion of p,p'-DDT to p;p'-DDE). <br /> Environmental Fate Rate Constants or Half-Lives: <br /> Volatilization:.Half.-life of 3.7-d for water depth of I°m, from soil w/h-1 of 578 h <br /> Oxidation: Photooxidation.half-life of 168-8400 h in water, 17.7-177 h in air <br />' Hydrolysis: Estimated first-order half life of 22 yr <br /> Biodegradation::Aqueous aerobic half-life of 2-15.6 yrs <br /> DDE. Common name:'DDE(p,p'-DDE; o,p'-DD:E),product of DDT degradation. <br /> Half-lives in the-environment: <br /> Air:Atmos.transformation lifetime est,to be< 1 d. <br /> Surfacelwater::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-1 alf--life of 340 d(rainbow-trout),300 d for birds. <br /> Environmental Fate-Rate Constants or'Half=Lives: <br /> Volatilization.N/A <br /> Oxidation:NIA <br /> Hydrolysis:>120 yr <br /> DDD. Common name: DDD,TDE(tetrachlorodiphenylethane), product of DDT deg. <br /> Half-lives in the environment: <br /> Air- .17.7-177h . <br /> Surface water: 2-15.6 yr. Groundwater.: 1680-270,000 h based on anaerobic soil study data <br /> Sediment:N/A <br /> Soil: Field half life of 2-15.6 yrs based on observed rates of biodeg.of DDT <br /> Biota: <br /> 119 hr in mussels. <br /> Page -6- <br /> Chesney Consulting <br />