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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: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 /> Biodegradation: N/A <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. <br /> Oxidation: Aquatic half-life approx.22 yr <br /> Hydrolysis:half-life of 570 d @ pH 9 and 190 yr @ pH 5 <br /> § 3.5 Description of all current off-site potential and/or known above and below ground sources off' <br /> contamination identified in the area of the project site include those sites referenced in <br /> Sections 3.2, 3.3, and 3.4 above. These listed sites can be considered"past"off-site sources <br /> of 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 /> § 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> § 5.1 Evaluation of each point source potential contamination described (i.e., the LUST and UST <br /> sites, the lead paint and asbestos from the once existing residential structure, and de minimus <br /> items such as observed fuel cans before razing of the structure, the apparently remaining <br /> septic tank, etc.) and non-point sources (i.e., agrichemical application and non-target drift, <br /> nitrate in the underlying groundwater, and possible DDT soil concentrations)pose a very <br /> low-to-insignificant risk to the subject property and human health. <br /> Page-6- <br /> Chesney Consulting <br />