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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 p,p'-DDE). <br /> Environmental Fate Rate Constants or Half-Lives: <br /> Volatilization: Half-life of 3.7 d for water depth of 1 in,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< I 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 /> 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:N/A <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-Lives: <br /> Volatilization: Aquatic approx. 1 mo. Oxidation: Aquatic half-life approx.22 yr <br /> §3.5 Descriptions of all current off-site potential and/or known above and below ground sources of <br /> contamination identified in the area of the project site include those referenced in Sections / <br /> 3.2, 3.3, and 3.4 above. These listed sites can be considered"past" off-site sources of <br /> contamination that are simultaneously"current" contaminated sources. <br /> § 4.0 EVALUATION OF PAST AND CURRENT SOURCES OF <br /> CONTAMINATION IDENTIFIED AT OR NEAR THE SITE AND <br /> RECOMMENDATIONS FOR FURTHER ACTION <br /> §4.1 Evaluation of each potential and/or known source of contamination identified in the above <br /> Sections have been discussed in the respective Sections to facilitate the transfer of <br /> information to the reader. <br /> Page -6- <br />