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R 5.0 CONCLUSIONS AND RECOMMENDATIONS 7thhannvery m visual observations, there is no surface contamination on the subject property, other CC� minor soil stains from oil in the equipment storage yard. This is a common occurrence that can be observed in virtually every farming operation. No soil staining was observed under or near the above ground diesel tanks, nor from the mixing of the Roundup agrichemical. The date of the last inspection of the property was January 18, 2007. 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 Parcel that composes the subject property, as assessed. The probability of subsurface contamination from pesticides, or other types of agrichemicals from the surrounding area, can be considered low-to-medium. Depth to groundwater 12 feet would make impact from adverse constituents a higher probability in comparison to a deeper groundwater depth of say 30+ feet below grade. The surface and subsurface soil types are a sandy silty soil with a somewhat lower biological activity than in a clayey soil, and therefore a low-to-medium decomposition capacity. The organic matter of the soil is probably medium-to-high, which can also contribute to decomposition of organic materials. Evaluation of each point source potential contamination described (i.e., the existing septic systems, the nearest underground leaking storage tanks, the on-site above ground diesel storage tanks, and agrichemical mixing area), 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-medium 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. Dumping and spillage of a household hazardous substance was not observed. The septic system density is low in the surrounding areas, except to the immediate west where the density could be considered medium-to-high. Consequently, the degree of nitrate-nitrogen impact to j the regional groundwater from this source can be considered minimal. Nitrate impact to the groundwater would be considerably greater from agricultural production land. The 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, spray equipment, crop dusting aircraft, trucks, exhaust and other environmental effects that may be offensive to some people. i Page -7- Chesney Consulting