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lierracon Soil Suitability / Nitrate Loading Study <br />Azevedo Property Acampo, CA <br />June 19, 2019 Terracon Project No. NA197009 <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 <br />Name / <br />Map <br />Symbol <br />Depth <br />(in) <br />USDA <br />Texture <br />Unified Soil <br />Classification <br />Clay <br />(/o) <br />Permeability <br />(in/hour) <br />Soil <br />reaction <br />(pH) <br />Salinity <br />(mmhos/cm) <br />Septic <br />tank <br />absorption <br />fields <br />San <br />Joaquin <br />Loam <br />240 <br />0-12 Loam CL-ML, ML 15- <br />25 1.50-1.60 5.6-6.5 <2 <br />severe <br />cemented <br />panpercs , <br />slowly <br />12-26 Sandy <br />clay loam SC 20- <br />25 <br />1.50-1.60 6.1-7.3 <2 <br />26-35 <br />35-60 <br />Clay <br />loam, <br />clay <br />Indurated <br />CL <br />--- <br />35- <br />50 <br />--- <br />1.50-1.60 <br />--- <br />6.1-7.8 <br />--- <br /><2 <br />--- --- <br />*Selected USDA physical and chemical properties <br />2.1.2 Mass Transport Soil Properties <br />The percolation test has revealed that the clayey sand to sandy clay soils have a slow percolation <br />rate between 3.5 feet bgs and 3.9 feet bgs. The longer the effluent remains near the surface, the <br />more treatment is enhanced due to natural processes within the soil. Based on the slow <br />percolation and stiffness/cementation of the soils, effluent is anticipated to remain within the soil <br />column. <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 />An existing domestic groundwater supply well will provide drinking water for the proposed <br />development. <br />Responsive Resourceful Reliable 13