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Soil Suitability I Nitrate Loading Study <br />Morada Produce — Ag Processing Building Stockton, California <br />May 14, 2021 Terracon Project No. NA217014 <br />lierracon <br />1.4.5 Groundwater Sample Handling <br />Refer to Appendix G for additional information. <br />1.5 Soil Profile and Geologic Information <br />The site is depicted on the Geologic Map of California 2010, as within generalized quaternary <br />Pleistocene and Holocene deposits which are comprised primarily of unconsolidated and semi- <br />consolidated alluvium, lake, playa, and terrace deposits. <br />Terracon reviewed the United States Department of Agriculture (USDA) Natural Resources <br />Conversation Service (NRCS) Web Soil Survey and USDA Soil Survey of San Joaquin County <br />(1992) for information regarding soil properties. Based on information obtained from the USDA <br />sources, site soils consist of Hollenbeck silty clay. Hollenbeck silty clay consist of moderately well <br />drained soils with 0 to 2 percent slopes. Parent material consists of alluvium derived from mixed <br />rock sources. Typical soil profiles consist of 0 to 10 inches silty clay, 10 to 37 inches clay, 37 to <br />42 inches silty clay loam, and 42 to 60 inches cemented soils. <br />1.5.1 Soil Boring Locations <br />Based on information provided by the client, the proposed leach field (Septic System #4) for the <br />new agricultural processing building will be located northeast of the building (Exhibit 2). Three <br />percolation test borings B1, B2, B3 were advanced in the vicinity of the proposed leach field. <br />1.5.2 Soil Boring Dimensions <br />Three borings were advanced using a track mounted drill rig with a 6-inch diameter auger to 3.0 <br />(B3), 23 (B2), and 25 (B1) feet bgs. <br />1.5.3 Soil Lithology Observed <br />The following table below is based on the soils encountered in boring B1 which was advanced to <br />25 feet bgs. <br />Table 6. <br />Summary of Soil Lithology <br />Boring Depth Interval (ft) Soil Type Unified Soil <br />Classification <br />0-1.5 No sample --- <br />B1 1.5-4 Brown black clay CL <br />4-5 Brown silt with sand ML <br />Responsive im Resourceful i Reliable 10