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FFDue shallow water table, impact from serious point source releases, and/or agrichemicals sticides and herbicides can readily occur. The degree of impact from adversets can be mitigated when clay soil exists from the soil surface down to the water table ch does occur in the Thornton locale. A Soil Suitability Study will be required by EHD for this project. At that time, it may be possible to sample the irrigation well that is directly to the east the proposed three-acre homesite Parcel, which will give an indication of the nitrate concentration in the underlying aquifers. ✓§ 4.0 EVALUATION OF PAST AND CURRENT SOURCES OF CONTAMINATION IDENTIFIED AT OR NEAR THE SITE AND RECOMMENDATIONS FOR FURTHER ACTION §4.1 Evaluation of each potential and/or known source of contamination identified in the above Sections have been discussed in the respective Sections to facilitate the transfer of information to the reader. Based upon the State Water Resources Control Board- GeoTracker System, there is a record of a Leaking Underground Fuel Tank (LUFT) approximately three-quarters of a mile to the northwest of the property. This is illustrated on the attached GeoTracker Site Map. It is impossible for this LUFT to adversely impact groundwater under the property due to the distances involved. The Inactive UST Facility Inventory List and the Underground Storage Tank Site Mitigation Database List,both from EHD, are found in Appendix C. The Lists show that there is no reference for Stokes, or for the property address. Potential environmental impacts from past,present or future facilities within a one mile radius of the property are unknown at this time. From the USGS Topo Map, it is noted that"Industrial Waste Ponds" are north of the property. Since the precise groundwater directional flow cannot be discerned, it is unknown what effect these ponds may have on the groundwater under the subject property. The science of pesticide residues in soil, air, surface water and groundwater is extremely complex and variable. Environmental models that attempt to predict pesticide behavior and transport in the environment are beyond the scope of this investigation. However,pesticides with long half-lives that may have been used or drifted onto the property decades ago,primarily DDT,may be of an extremely slight concern. DDT was used extensively throughout the agricultural fields of the San Joaquin Valley and degradates of DDT can be found in nearly all these soils. Previous Exposure Assessments made on typical San Joaquin Valley soils suggest an extremely low probability of adverse health effects from soil DDT/DDD and DDE concentrations (if the concentrations even exist). The environmental fate data are presented below for DDT, and its degradates DDD and DDE. Page-5- Chesney Consulting