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Soil Suitability /Nitrate Loading Study Irerracon <br />ALL STAR HEAVY HAUL & TOWING INCORPORATED Tracy, California <br />July 1, 2022 Terracon Project No. NA217024 <br />Based on a review of the site plan, Capay clay is located on the majority of the site and Septic <br />System 1 is anticipated to be located within this soil type. Capay clay consists of soils with 0 to 1 <br />percent slopes. Parent material consists of clayey alluvium derived from sedimentary rock <br />sources Typical soil profiles consist of 60 inches clay. <br />Permeability and runoff are slow for Capay clay. The main limitations for that soil type is low <br />available water capacity and high-water table and perching. The soil is subject to flooding during <br />high precipitation. <br />1.5.1 Soil Boring Locations <br />Based on a review of the site plan, the proposed Septic System will be located east of existing <br />warehouse (Exhibit 2). Three percolation test borings B1, B2, and B3 were advanced in the vicinity <br />of the proposed septic tank. <br />Table 5. <br />Soil Boring Information <br />Percolation Test <br />Depth (Feet) <br />Latitude <br />Longitude <br />B1 <br />(Soil profile) <br />23.4 <br />37.7115228 <br />-121.5148364 <br />B2 <br />9.00 <br />37.7114756 <br />-121.5148465 <br />B3 <br />3.32 <br />37.7114278 <br />-121.5148612 <br />1.5.2 Soil Boring Dimensions <br />Three borings were advanced using a 6 -inch hollow stem auger. Refer to Section 1.5.1 for boring <br />depths. <br />1.5.3 Soil Lithology Observed <br />The following table below is based on the soils encountered during our field work. <br />Table 6. <br />Summary of Soil Lithology <br />Boring <br />Depth Interval (feet) <br />Soil Type <br />Unified Soil <br />Classification <br />0 - 1 <br />Topsoil <br />--- <br />--1.0-5.0 <br />1.0-5.0 <br />Black, soft, medium <br />CL -ML <br />B1 (Soil profile) <br />compaction silty clay <br />Pale tan, fine grained, <br />50-8.0 <br />soft, loosely compaction <br />CL <br />sandy clay <br />Responsive ■ Resourceful ■ Reliably 11 <br />