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Soil Profile and Geologic Information The Site is mapped on the Preliminary geologic map showing Quaternary deposits of the Lodi quadrangle, Califomia (Marchand and Atwater, 1979). It is depicted within a map unit of Modesto Formation undifferentiated deposits, described as "mainly arkosic, forming toe of Mokelumne alluvial fan, generally covered by 0.3 to 1.0 m of Holocene intertidal deposits" (Plate 7). The surface and near surface soils located at the Site are reported by the USDA Web Soil Survey to be composed of Kingile-Ryde complex, Rindge muck, and Ryde-Peltier complex (Plate 8) (USDA, 2017). The table below presents some selected properties of these soils: Table 1. Selected Properties of On-Site Soils (USDA, 1992) Soil Name Depth Unified Soil Salinity Soil Parma- Septic tank and Map Reaction ability absorption Symbol (in) Classification mmhoslcm pH (in/hr) fields Kingile, 0-17 Muck; PT <2 4.5-6.5 6.0-20 Severe: 191 17-61 Silty clay loam, clay, <2 5.6-7.8 0.06-0.2 subsides, silty clay; ML, CL wetness, peres slowly Ryde, 0-24 Clay loam; CL, ML <2 5.1-7.3 0.2-0.6 Severe: • 191 24-63 Stratified muck to silty <2 6.1-7.8 0.6-2.0 wetness clay loam; OL, OH Rindge, 0-13 Muck; PT <2 4.5-6.5 6.0-20 Severe: 225 13-60 Mucky peat, peat, muck; <2 4.5-6.5 6.0-20 wetness, PT poor filter, subsides Ryde, 0-24 Clay loam; CL, ML <2 5.1-7.3 0.2-0.6 Severe: 233 24-63 Stratified muck to silty <2 6.1-7.8 0.6-2.0 wetness clay loam; OL, OH Peltier, 0-22 Mucky clay loam; OL, <2 5.6-7.3 0.6-2.0 Severe: 233 OH subsides, 22-24 Silty clay, clay; CL, CH <2 5.6-7.8 0.06-0.2 wetness, 24-45 Mucky clay loam, mucky <2 5.6-7.8 0.6-2.0 peres slowly silty clay loam, mucky clay; OL, OH 45-60 Clay, silty clay, silty clay <2 5.6-7.8 0.06-0.2 loam; CL, CH Note:The table descriptions do not necessarily reflect site-specific soil properties. See description of the map unit for composition and behavior characteristics of the map unit. • LOGE 1708 Page 5