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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. Therefore, as of the date of this report, it is my opinion that no corrective action is required within the boundaries of the subject property. The probability of subsurface contamination from pesticides can be considered extremely low-to- nonexistent, considering the environmental fate data for DDT and related compounds presented above. The depth to groundwater of 28 feet would make impact from adverse constituents a higher probability in comparison to a deeper groundwater depth. However, the surface and subsurface soil types are a sandy-silt soil with a higher biological activity than in a sandy soil, and therefore, higher mitigation capacity. The probability for nitrate contamination of the underlying aquifers originating from septic systems is low due to the low density of systems in the study area. If high nitrate concentrations are found in the well water, it may be attributed to agricultural fertilizer inputs. If the new parcel is created, a prospective purchaser of this parcel must realize that the subject property is surrounded by agricultural production land. Consequences of this land use include: dust, odors, insects, agrichemical sprays, machinery, trucks and other effects that may be offensive to some people. Page-5- C&sney Consulting