SU0003940 SSCRPT - Laserfiche WebLink

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CONCLUSIONS AND RECOMMENDATIONS From visual observations, there is no surface contamination on the subject property. Therefore, at this point in time, no corrective action is required within the boundaries of the subject property. The probability of surface and/or subsurface contamination from pesticides can be considered extremely low-to-nonexistent, considering the environmental fate data for DDT and related compounds presented above. Additionally, the surface and subsurface soil types are predominately a clay soil with the biological activity expected to be higher than in a sandier soil. During earthwork procedures, there should be a relatively high aerobic capacity in the soil environment which promote a higher level of degradation and decomposition of any adverse organic molecules that may exist in the soil. The Linkous family apparently leveled the subject property and constructed what appears to be a building pad in the approximate location of Parcel 2. As stated above, it is unlikely that there is anything buried under this building pad, which would compromise the structural integrity of not only the pad, but any structures that were intended to be built upon it. The depth of groundwater of 120 to 135 feet would make impact from adverse constituents unlikely. It has been documented from the Nitrate Loading Study that the underlying drinking water aquifers contain a nitrate concentration of 4 ppm nitrate (as nitrate). This is an extremely low concentration and not typically seen within San Joaquin County. Therefore, the probability of nitrate or leachate contamination from the Landfill to the underlying aquifers is low due to the favorable surface and subsurface soils consisting of clays and silts, intervening clay layers. and a deep depth to groundwater. Septic system recommendations have been discussed in the Nitrate Loading Study and Soil Suitability Study completed for, and approved by, the Environmental Health Department. The Department will require that the above-referenced Section of the California Code of Regulations be complied with, and that a 200 to 300 foot grout seal be installed for any new domestic well drilled on the subject Parcels. Page -6- Chesney Consulting