SU0004624 SSCRPT - Laserfiche WebLink

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Fbamand of information which attempt to document and define on-site and surrounding past also utilized. The first is the use of aerial nhotoeranhs. Aerial photographs of the om 1970 through 1977 found on USDA Soil Maps show that the referenced SFR, rees adjacent to the WSID Canal are discernable. The open land area may have been ural production at this period of time. The USDA Soil Map shows the on-site soil to consist of a Capay clay(#118). Typically,these soil types are moderately well drained with slow permeability. Sufficient soil"fines" exist to impede rapid percolation, so treatment of septic effluent can occur before reaching the water table, unlike what would be encountered with a sandy soil. The second source of information can be found on USGS maps. The property is located within the Midway Quadrangle map, found in Appendix "A" and denotes exclusively the SFR and the referenced barn structure. A third source of information was utilized for this SSCR since the property was relatively close to the City of Tracy. The Rec-Check®data,produced by the firm of Environmental Record Search, Inc. reveals that there are no hazardous material sites within the study area which may impact the property, according to the public record sources searched. It is a possibility that agrichemicals sprayed on surrounding agricultural production land to the south may drift onto the subject property, although it is rare atmospheric conditions when the wind blows to the north. Prior to land development north of Interstate 205, 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 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 environment. The environmental fate data for DDT and its degradates DDD and DDE are illustrated below: Chesney Consulting