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PESTICIDE OR TYPE, SOIL WATER <br /> FERTILIZER APPLIED PERSISTENCE PERSISTENCE <br /> TO THE PROPERTY <br /> (Common Name) <br /> Ammonium Sulfate Fertilizer Immediate plant uptake Unknown <br /> Paraquat Herbicide 1000+ days 13+hrs <br /> Surflan Herbicide 20-128 days Unknown <br /> Glyphosate Herbicide 1 - 174 days 12 - 70 days <br /> Rovral Fungicide 7 to 60 days Rapid Breakdown <br /> Omite Miticide(Pesticide) Unknown Unknown <br /> Pesticides with long half-lives that may have been used or drifted onto the property decades <br /> ago, primarily DDT, may be of an extremely slight concern. DDT was used extensively <br /> throughout the agricultural fields of the San Joaquin Valley and degradates of DDT can be <br /> found in nearly all these soils. Previous Exposure Assessments made on typical San Joaquin <br /> Valley soils suggest an extremely low probability of adverse health effects from soil <br /> DDT/DDD and DDE concentrations (if the concentrations even exist). The environmental <br /> fate data are presented below for DDT, and its 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 h for a pond 1 in 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 soil.(conversion of p,p'-DDT to pp'-DDE). <br /> Environmental Fate Rate Constants or Half-Lives: <br /> Volatilization:Half-life of 3.7 d for water depth of 1 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'-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:N/A <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 /> Environmental Fate Rate Constants or Half-Lives: <br /> Volatilization:N/A <br /> Oxidation:N/A <br /> Hydrolysis:>120 yr <br /> Page-6- <br /> Chesney Consulting <br />