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Soil Suitability/Nitrate Loading Study <br /> Soares Property ■ Escalon, CA Irerracon <br /> December 13, 2019 ■ Terracon Project No. NA197095 <br /> Terracon reviewed the USDA NRCS Web Soil Survey and USDA Soil Survey of San Joaquin <br /> County (1992) for information regarding Delhi loamy sand soils (Section 1.5). Selected physical <br /> and chemical properties for the soil types are listed in the following table. <br /> Table 8. <br /> Physical and Chemical Properties* <br /> Soil Soil Septic tank <br /> Name/ Depth USDA Unified Soil Clay Permeability Salinity <br /> Map (in) Texture Classification (%) (in/hour) reaction (mmhos/cm) absorption <br /> Symbol (pH) fields <br /> 0-10 Loamy SM 0-5 6.0-20.0 6.1-7.8 <2 <br /> sand <br /> Loamy <br /> Delhi 16-26 sand, SM 0-5 6.0-20.0 6.1-7.8 <2 <br /> loamy loamy fine Severe:poor <br /> sand! sand filter <br /> 142 Sand, <br /> 26-60 loamy SP-SM,SM 0-5 6.0-20.0 6.1-7.8 <2 <br /> sand,fine <br /> sand <br /> 'Selected USDA physical and chemical properties <br /> 2.1.2 Mass Transport Soil Properties <br /> The longer the effluent remains near the surface, the more treatment is enhanced due to natural <br /> processes within the soil. The percolation test has revealed that the sandy silt and sandy clay <br /> soils have a moderate percolation at shallow depths (<3.5 feet bgs). <br /> 2.2 Groundwater Analysis <br /> 2.2.1 Regional Groundwater <br /> A discussion of regional groundwater, including depth to groundwater is included in Section 1.4.1. <br /> No significant seasonal trends were evident from the sources consulted. <br /> 2.2.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential groundwater contamination is included in Section 1.4.2. <br /> 2.2.3 Current and Future On-Site Ground Water Uses <br /> The existing groundwater well (currently not operational) is proposed to be used for the future <br /> residence. <br /> Responsive ■ Resourceful ■ Reliable 13 <br />