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Soil Suitability/ Nitrate Loading Study <br />Lease Property ■ Acampo, California <br />December 17, 2021 Terracon Project No. NA217090 <br />1.5 Soil Profile and Geologic Information <br />Ircerr on <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 San Joaquin — Urban land complex which consists of moderately <br />well drained soils with 0 to 2 percent slopes. Parent material consists of alluvium derived from <br />granitic rock sources. Typical soil profiles consist of 0 to 16 inches loam, 16 to 26 inches clay, <br />and 26 to 60 inches indurated soils. The main limitations are slow permeability in claypan and <br />hardpan, high shrink swell potential and low strength in the claypan. Slow permeability can be <br />overcome by ripping the hardpan, increasing the size of the leachfield, backfilling the trench with <br />sandy material, and/or installing long absorption lines. <br />1.5.1 Soil Boring Locations <br />Two shallow borings (B1 and B3) and one soil profile (B3) were advanced on the southern portion <br />of the site. <br />1.5.2 Soil Boring Dimensions <br />Borings 61 and B3 were drilled with a 6 -inch diameter auger to 3.5 feet bgs and 21 feet bgs, <br />respectively. Boring B3 was advanced with a 4 -inch diameter hand auger to 2.25 feet bgs. <br />1.5.3 Soil Lithology Observed <br />The following soils were observed: <br />Table 5. <br />Summary of Soil Lithology <br />Boring <br />Depth Interval (ft) <br />Soil Type <br />Unified Soil <br />Classification <br />0-3 <br />Lean clay, dark brown, <br />CL <br />131 — 3.5' <br />moist <br />3-3.5 <br />Sandy silt, tan, loose, dry <br />ML <br />0-3 <br />Lean clay, dark brown <br />CL <br />B2 _ 21' <br />moist <br />3-5 <br />Silt, tan, loose, dry <br />ML <br />Responsive ■ Resourceful ■ Reliable 9 <br />