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PESTICIDE OR TYPE SOIL PERSISTENCE WATER FERTILIZER APPLIED PERSISTENCE TO THE PROPERTY (Common Name) (RoundUp) Herbicide 1 - 174 days 12 -70 days Glyphosate Little risk to groundwater (Surflau) Herbicide 20 days Unknown,but some Oryzalin risk to groundwater Diazonon Insecticide 2-4 weeks Potential risk to groundwater Vangard Fungicide Unknown Unknown Ziram Fungicide 30 days Has never been detected in groundwater (Esfenvalerate) Insecticide 15 days to 3 months Little risk to Asana I I groundwater 5.0 CONCLUSIONS AND RECOMMENDATIONS § 5.1 From visual observations, there is no surface contamination on the subject property. The date of the last inspection of the property was November 16, 2006. Section 9-905.12 of the 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 Parcels that compose the subject property, as assessed. The probability of subsurface contamination from pesticides, or other types of agrichemicals, can be considered low-to-medium. Depth to groundwater of 55 feet would make impact from adverse constituents a somewhat lower probability in comparison to a much shallower groundwater depth of say 10 feet below grade. The surface and subsurface soil types are a silty sandy soil with a somewhat lower biological activity than in a clayey soil, and therefore a low-to-medium decomposition capacity of agrichemicals that are currently applied, and were applied in the past. However, the organic matter of the soil is probably high around the root zones which can contribute to decomposition of organic materials. Evaluation of each point source potential contamination described (i.e., the existing septic systems, the nearest underground and leaking storage tanks, and the on-site electrical transformers), and non- point sources(i.e., on-site and surrounding agrichemical applications and non-target drift, nitrate from on-site and surrounding fertilizer applications, and the extremely slight possibility of DDT soil concentrations)pose a low-to-insignificant risk to the environment and to human health, in my professional opinion. Page -7- Chesney Consulting