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The farming and dairy operations are conducted by Mr. Van Vuren. Since the dairy is completely organic,there have been no a ichemical ap6 lice ations for the.past ten ears., Any nearby agrichemical mixing and application must be done very carefully so that the Van Vuren property is not impacted. Therefore, assurance is made that material applied nearby has been done correctly and accurately to its intended target without drift, The subject property was surveyed for evidence which is indicative of surface and/or subsurface contamination: There is one transformer on the subject property that is relatively new and exhibited no evidence of leakage. Evidence of typical solid waste disposal at the actual dairy site - included old cars, containers, metal and other objects. The site was inspected for environmental concerns originating from discolored, disturbed/subsided soils, stressed vegetation or unusual/noxious odors. None of these environmental indicators were observed, however, the acreage is currently in oats and difficult to observe. Obviously, no hazaxdous..materials or agrichemicals are stored on-site in the barn. An important concern associated with the environmental assessment of agricultural properties is the issue of buried pesticide containers or discarded items. It was an occasional practice to dispose of containers by this method many years ago. To detect these types of underground artifacts is difficult even with the use of ground penetrating radar or other types of non-intrusive, subsurface analyses. It is usually only after a contaminant plume has impacted a domestic well 71 that buried pesticide containers are usually discovered. Due to the underlying hardpan layer, it is highly unlikely this practice occurred in this locale. The static groundwater table is found approximately 100 feet under the property as illustrated on the attached Lines of Equal Depth to Groundwater Map published by the Flood Control District. This is considered a deep groundwater elevation. Impact from nitrate to comparatively deep groundwater may not be as significant as with shallow groundwater. This is particularly true if there are intervening layers of clay down to the static water table, thereby attenuating adverse - constituents. The soil profile to the depth of groundwater is assumed to consist of heavier soils of clay and silt. The referenced hardpan layer can also have an attenuating effect on the downward migration of nitrates. Groundwater directional flow appears to be toward the northwest toward a zone of recharge, as denoted on the attached Lines of Equal Elevation Groundwater map. -- Although the subject property has been in agricultural production for five decades, there was no evaluation of environmental fate data for agrichemical residues as a nonpoint source of potential contamination since none have been applied for the past 10 years. In addition, it is highly >.� unlikely there has been agrichemical drift which may have impacted the subject property. The - science of pesticide residues in soil, air, surface water and groundwater is extremely complex and variable. Environmental models which attempt to predict pesticide behavior and transport in the environment are beyond the scope of this investigation. vaffey Ag Research