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Crbuildi�ng TWillows entional septic system with tanks and a leachfield will serve the new office idential structure. As noted on the attached Soil Survey map, the subject osed of three soil tunes: Capay clay(#118 and#121), Vernalis clay loam(#259) y (#274). Willows clay is adjacent to Kasson Road at the northeast end of the property. Septic effluent percolation is expected to be slow in these soil types. Farming operations are conducted by Thomsen Brothers Farming. Agrichemical applications are done by Mr. Trinkle's flying service as evidenced by the attached Pesticide Use Reporting forms. AQrichemical mixine is done off sjJ� while. fe ;1; P+.nixinooFJrdenP nn_c;rP. Since Mr. Trinkle applies the material himself, there is assurance that material is applied correctly and accurately to its intended target without(or minimal) drift. There is a very slight possibility of minute volumes of pesticide drift originating from the surrounding acreage during aerial or ground applications. The subject property was surveyed for evidence that is indicative of surface or subsurface contamination: There is a transformer on the property which is comparatively new and probably does not contain polychloride biphenyl (PCB) laden oil. No evidence of solid hazardous waste disposal was observed. Domestic solid waste is removed by Tracy Disposal Compmx_ The entire acreage was inspected for environmental concerns originating from discolored, disturbed/subsided soils, stressed vegetation or unusual/noxious odors. None of these environmental indicators were observed. No hazardous materials are stored on-site and there was no indication or observations of spills(other than those referenced), or other items associated with hazardous materials. 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 that buried pesticide containers are usually discovered. From previous studies done in the area, the static groundwater table is found approximatelygieht fceLunder the property. This can be considered a shallow groundwater elevation. The soil profile to the depth of groundwater consists of heavier clay soils which may impede the migration of contaminants down to the groundwater. Groundwater directional flow has been historically in a northward direction toward the San Joaquin River. An evaluation of environmental fate data for agrichemical residues as a nonpoint source of potential contamination was done on the two agrichemicals used in weed management by Thomsen Brothers Farming. 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. It has been clearly evident over the last five decades that the risk/benefit ratio regarding pesticides has been overwhelming benefit and comparatively low risk to the United States population and to the environment, as a whole. I Page -3- Vafiey Ag Research