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1 <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< 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 /> 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. <br /> 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 /> Biodegradation: Aqueous aerobic half-life of 2-15.6 yr <br /> VI. CONCLUSIONS AND RECOMMENDATIONS <br /> From visual observations, there is no surface contamination from hazardous materials or hazardous <br /> environmental conditions. Section 9-905.12 of San Joaquin County Development Title states <br /> "Corrective Action: If the report indicates there are surface and subsurface contamination, i <br /> corrective action shall be recommended in the report and concurred with by Environmental Health <br /> prior tothe issuance of the building permit." Therefore, no corrective action is required on the <br /> proposed four Parcels composing the subject property. However, if the on-site residential structure <br /> is ever demolished, an asbestos survey should be done by the demolition contractor, or his <br /> representative. <br /> 6 <br /> Chesney Consulting <br />