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§ 5.0 CONCLUSIONS AND RECOMMENDATIONS § 5.1 Evaluation of each point source potential contamination described(future septic systems, the nearest leaking underground storage tank, nearby electrical transformers and de minimus items such as fuel cans on Parcel 2) and non-point sources (i.e., surrounding agrichemical application and non-target drift, nitrate and possibly DBCP groundwater contamination, and possible DDT soil concentrations)pose a low-to-insignificant risk to the environment and to human health. 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. Typical household "hazardous materials" include gasoline,paint thinners, new and used motor oil, antifreeze, etc. Spillage and dumping of a hazardous substance was not observed on, or adjacent to the subject property. Domestic wells to be installed on the subject Parcels should be tested for DBCP before they are completed. It may be possible to test the well on"Parcel 2,"however, this Parcel is not part of the project and EHD regulations normally prohibit sampling and testing of wells not associated with a particular project. 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 five Parcels that compose the subject property. 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. As noted on the Lines of Equal Depth groundwater map, the static groundwater depth is approximately 75 feet. The lines of Equal Elevation map shows the groundwater directional flow to be in a northwesterly direction. This groundwater depth can be considered relatively deep and not readily impacted from adverse environmental constituents. The subject site 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-6- Chesney Consulting