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DDT was used extensively throughout the agricultural fields of the 7aealley anddegradates of DDT can be found in nearly all these soils. Previous essmentsmade on typical San Joaquin Valley soils suggest an extremely low adversehealth effects from soil DDT/DDD and DDE concentrations (if the evenexist). The environmental fate data are presented below for DDT, ates DDD and DDE. DDT. Common name: Agritan, Anofex,Azotox,et al. Half-lives in the environment: Air. 17.7 -177 It. Surface water: 73.9 h for a pond 1 m deep. Degradation half-life of about 10 yr-average from loss rates determined in Lake Michigan. Groundwater. 16 d to 31.3 yr. Sediment: 3 to 5 yr Soil:2-15.6 yrs based on observed rates of biodegradation in aerobic soils under field conditions. Avg. half life of-12 yrs in 3 different soils for-50 ppm in soil.(conversion of p,p'-DDT to p,p'-DDE). Environmental Fate Rate Constants or Half-Lives: Volatilization: Half-life of 3.7 d for water depth of 1 m,from soil w/h-1 of 578 h Oxidation:Photooxidation half-life of 168-8400 h in water, 17.7-177 h in air Hydrolysis: Estimated first-order half life of 22 yr Biodegradation: Aqueous aerobic half-life of 2-15.6 yrs DDE. Common name: DDE(p,p'-DDE;o,p'-DDE),product of DDT degradation. Half-lives in the environment: Air. Atmos.transformation lifetime est. to be< 1 d. Surface water: Hydrolytic half-life of >120 yr,est.half-life>300 d in lakes. Groundwater: N/A Sediment:N/A Soil: Field half life of 1000 d Biota: Elimination half-life of 340 d(rainbow trout),300 d for birds. Environmental Fate Rate Constants or Half-Lives: Volatilization: N/A Oxidation: N/A Hydrolysis:>120 yr DDD. Common name: DDD,TDE(tetrachlorodiphenylethane),product of DDT deg. Half-lives in the environment: Air: 17.7-177 h Surface water: 2-15.6 yr. Groundwater: 1680-270,000 It based on anaerobic soil study data Sediment:N/A Soil:Field half life of 2-15.6 yrs based on observed rates of biodeg.of DDT Biota: 119 hr in mussels. Environmental Fate Rate Constants or Half-Lives: Volatilization: Aquatic approx. 1 mo. Oxidation: Aquatic half-life approx. 22 yr Hydrolysis: half-life of 570 d @ pH 9 and 190 yr @ pH 5 § 3.5 Description of all current off-site potential and/or known above and below ground sources of contamination identified in the area of the project site include those sites referenced in Sections 3.2, 3.3, and 3.4 above. These listed sites can be considered"past" off-site sources of contamination that are simultaneously"current" contaminated sources. LL Page -6- Chesney Consulting