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t 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: NIA 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 CONCLUSIONS AND RECOMMENDATIONS From visual observations, there is no surface contamination on the subject property. The Merlot vinegar i no s ow any si s-5--stress omO. +iranm n. Unusually stressed, or bare vines during the growing season may be indicative of a subsurface concern. Considering 1.) There is virtually no area to mix agrichemicals and 2.) A pressurized water supply does not exist on the acreage for agrichemical mixing, it is unlikely any mixing was ever done on-site. Therefore, as of the date of this report, it is my opinion that no corrective action is required within the boundaries of the property. The date of the last inspection of the property was November 15 2004. The probability of subsurface contamination from pesticides, or other types of agrichemicals, can be considered extremely low-to-nonexistent, considering the environmental fate data for the agrichemicals applied to the property, along with DDT and related compounds presented above. The depth to groundwater of 160 feet would make impact from adverse constituents a much lower probability in comparison to a shallow groundwater depth. This is evidenced by well logs illustrating intervening strata of silts and clays. The surface and subsurface soil types are a silty clay soil with a higher biological activity than in a sandy soil, and therefore, higher mitigation capacity of agrichemicals. Page -5- Chesney Consulting