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FFIand urces of information which attempt to document and define on-site and surrounding past e were also utilized. The first is the use of aerial photographs. Aerial photographs of the area from 1970 through 1977. found on USDA Soil Maps show the residential structure andrn building and no other buildings on the property. The USDA Soil Map shows the on-site soil to consist of a Veritas fine sandy loam (#266) and a small portion of the eastern edge of the property is Honcut sandy loam (#175). Typically, these soil types are well drained with moderately rapid permeability. Sufficient soil "fines" exist to impede very rapid percolation, so treatment of septic effluent can occur before reaching the water table, unlike what would be encountered with a very sandy soil. The second source of information can be found on.USGS maps. The property is located within the Lathrop Quadrangle map, found in Appendix "A." The referenced buildings are exclusively shown. It is a possibility that agrichemicals sprayed on surrounding agricultural production land may drift onto the subject property: San Joaquin County Mosquito Abatement District sprays for mosquitos in the surrounding open areas that may contain stagnant water. Noted on the Environmental Questionnaire, is the response to pesticide applications on the property. The following herbicide has been applied to the property in the last three'years As noted no a richemical mixing occurs on-site and no a richemicals are orjhave been stored on- site Gramoxone; Common Name: Paraquat Environmental fate data for this agrichemicaI as a nonpoint source of potential contamination was done, and is found in Appendix."C." In reviewing the environmental fate data of the Gramoxone applied, we find that there is a moderate-to-long persistence in the soil, but virtually no possibility of impacting the groundwater environment. 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. The herbicide used on the property is widely used throughout California. Pesticides with long half-lives that may have been used or drifted onto the property decades ago, primarily DDT, may be of a very 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). It can be reasonably concluded that any DDT, DDE and DDD concentrations that may be present on the property will continue to degrade as reported in the published environmental fate data. The environmental fate data for DDT and its degradates DDD and DDE are illustrated below: Pa e -4- Chesney Consubting