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Soil Suitability/ Nitrate Loading Study Irerracon <br /> Manteca Farm Improvement - Manteca, California <br /> October 29, 2019 Terracon Project No. NA197073 <br /> Terracon reviewed the USDA NRCS Web Soil Survey and USDA Soil Survey of San Joaquin <br /> County (1992)for information regarding San Joaquin loam 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 <br /> Name/ Depth USDA Unified Soil Clay Permeability Salinity tank <br /> Ma in Texture Classification % in/hour reaction mmhos/cm absorption <br /> P �� ) � ) (� ) (pH) � ) P <br /> Symbol fields <br /> 141 0-10 Fine sand SP-SM, SM 0-5 6.0-20 6.1-7.8 <2 <br /> Delhi Sand, Severe: <br /> fine 10-60 loamy SP-SM, SM 0-5 6.0-20 6.1-7.8 <2 poor filter <br /> sand sand,fine <br /> sand <br /> 'Selected USDA physical and chemical properties <br /> 2.1.2 Mass Transport Soil Properties <br /> The percolation test has revealed that soils from 0 to 3.5 feet bgs are permeable and will allow <br /> for rapid infiltration of water. The longer the effluent remains near the surface, the more treatment <br /> is enhanced due to natural processes within the soil. If the permeable soils exist to the depth of <br /> the groundwater table, it is possible that surface contaminants may be transported fairly rapidly. <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 /> There is one groundwater wells on the site. <br /> 2.3 Sources and Impact of Nitrate to Groundwater <br /> 2.3.1 Current Off-Site Sources of Nitrate <br /> Septic systems and agricultural land in the area may be the most significant sources of nitrate in <br /> groundwater. Septic tank use in the vicinity is discussed in Section 1.3.5. <br /> Responsive ■ Resourceful ■ Reliable 14 <br />