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There is an extremely slight potential of DDT residual insecticide from farming operations that may have taken place on the property decades ago, although this is somewhat improbable and also inconsequential. Any minute residual pesticide concentrations are inconsequential /� J in our professional opinion because the vast majority of the property will remain in agricultural production and not be developed into a residential subdivision. § 3.3 Description of all current on-site potential and/or known above ground and below ground sources of contamination identified at the project site are included in Section 3.2. No sources 3 of current aboveground contamination exist that were observable. Subsurface contamination of known or unknown contaminants may be possible. As referenced, the on-site septic system leachfields and surrounding leachfields may be considered to have an extremely slight /tf , impact to groundwater due to sparse density in this locale. l §3.4 Description of all past off-site potential and/or known above and below ground sources of contamination identified in the area of the project site that could impact the site include: l Information conveyed by the Envisions Program Documents-Underground Storage Tank Site Mitigation Database List illustrate no listings on, or in proximity to the subject property. No Leaking Underground Fuel Tanks (LUFTs) are within 1000 ft of the property, as illustrated on the Geotracker data. There are no other publicly disclosed contaminated sites within 1000 feet of the subject property. Agricultural spray drift(non-target) from the nearest agricultural production land affecting the property could be a possibility, since agricultural production occurs all around the 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 3 l transport in the environment are beyond the scope of this investigation. As referenced below, l ) although DDT was banned in 1972, its presence in San Joaquin Valley soils is indicative of its long half-life. Consequently, there may be extremely small concentrations of DDT and its degradates in the subject property soils. 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 1\ fate data are presented below for DDT, and its degradates DDD and DDE. J Page-5-