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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 December 16, 2005. 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 two proposed Parcels that are to compose the subject property. The following two statements are recommendations: • Upon removal of the apparent fertigation systems for both on-site wells,backflow ✓ prevention devices should be verified as in-place and operational at the time of use. • Upon installation of the new drip irrigation system, the backflow prevention devices for this new system should be verified. The probability of subsurface contamination from pesticides, or other types of agrichemicals, can be considered extremely low-to-nonexistent. The depth to groundwater of 160 feet would make impact from adverse constituents a much lower probability in comparison to a shallow groundwater depth. The surface and subsurface soil types are a silty clay soil with a higher biological activity than in a sandy soil, and therefore higher decomposition capacity of any agrichemicals that may have been applied in the past. Evaluation of each point source potential contamination described (i.e., potential future septic systems, the nearest underground storage tank, on-site electrical power lines and the on-site diesel storage tanks) and non-point sources (i.e., on-site and surrounding agrichemical applications and non-target drift,nitrate from on-site 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. /The ASTM E-1527-00 Document referenced on Page 2 refers to de minimus environmental conditions. De minimus conditions generally do not present a material risk to public health or to the environment and generally would not include an enforcement action if observed by the appropriate governmental agencies. Household hazardous materials may be considered de minimus concerns if there has been no spillage or dumping. Spillage and dumping of a hazardous substance was not observed. /The septic system density is extremely low in the surrounding areas. Consequently, the degree of nitrate-nitrogen impact from this source can be considered inconsequential. Nitrate impact would be considerably greater from agricultural production land. �he subject site will continue to be productive farmland, and is surrounded by properties that engage in production agriculture. Consequences of this surrounding land use include: noise, dust, odors, insects, machinery, crop dusting aircraft, trucks, exhaust and other environmental effects that may be offensive to some people. Page -7- Chesney Consulting