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u ..i Air: 17.7-177 h. 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 in,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 Biodegradation:N/A 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 h 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 Biodegradation:Aqueous aerobic half-life of 2-15.6 yr 5.0 CONCLUSIONS AND RECOMMENDATIONS § 1 rom visual observations, there is no surface contamination on the subject property. The due—of the last inspection of the property was June 20, 2006. Section 9-905.12 of San Joaquin County Development Title states"Corrective Action: If the report indicates there are surface and subsurface contamination, corrective action shall be recommended in the report and concurred with by Environmental Health prior to the issuance of the building permit." Therefore, it is my professional opinion that no corrective action is required on the proposed Parcels that are to compose the subject property, as assessed. The probability of subsurface contamination fromlade or other types of agrichemicals, can be considered low-to-medium. Depth to groundwate of 10 fee would make impact from adverse constituents a higher probability in comparison to a groundwater depth. a e -6- Chesney Consulting