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V. AGRICULTURAL PESTICIDE DOCUMENTATION San Joaquin Agricultural Commissioner's Office maintains pesticide application records based rrThe n the growers' name, or the name of the party that farmed the subject property. This may or may not be the name of the property owner. Their records are not retrievable by address or parcel number. A verbal request for the name of the previous owner, Anna June Ratto, reveals no records correlating with the subject property. It is a very slight possibility that agrichemicals sprayed on agricultural production land to the north of Eight Mile Road may drift onto the rop subject e ] property, since the predominate wind direction is to the east, southeast. Prior to surrounding land development around the property,pesticides may have been used, or drifted onto the subject property soils. 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. 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 o the concentrations even exist). It can be reasonably concluded that any DDT, DDE and DDD concentrations that may be present in the subject property soils at very low concentrations,will continue to degrade as reported in the published environmental fate data. These concentrations pose no threat no human health or the t environment. The environmental fate data for DDT and its degradates DDD and DDE are illustrated below: DDT. Common name: Agritan, Anofex, Azotox,et al. Half-lives in the environment: Air: 17.7 -177 h. Surface water: 73.9 h for a pond 1 m deep. Degradation half-life of about 10 yr-average from loss rates determined in Lake Michigan. Groundwater: 16 d to 31.3 yr. Sediment: 3 to 5 yr Soil: 2-15.6 yrs based on observed rates of biodegradation in aerobic soils under field conditions. Avg.half life of-12 yrs in 3 different soils for -50 ppm in soil. (conversion of p,p'-DDT to p,p'-DDE). 5 Chesney Consulting