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Soil Suitability / Nitrate Loading Study <br /> 11065 North Alpine Road I Stockton, California r rerracon <br /> June 30, 2026 1 Terracon Project No. NA267068 <br /> 1.5.1. Soil Boring Locations <br /> Based on a review of the site plan, the proposed Septic System will be located on the <br /> north side of the lot (Exhibit 3 and included client site plan overlay). Three percolation <br /> test borings B1, B2, and B3 were advanced in the vicinity of the proposed septic system. <br /> Table 5 <br /> Soil Boring Information <br /> Boring Number Depth (Feet) Latitude Longitude <br /> B1 25 38.068167 -121.211166 <br /> B2 15 38.068167 -121.211317 <br /> B3 3.5 38.068170 -121.211666 <br /> 1.5.2. Soil Boring Dimensions <br /> Three borings were advanced using 6-inch diameter hollow stem augers on a truck- <br /> mounted drill rig (Diedrich D-70). Refer to Table 5 for boring 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 Depth Interval (feet) Soil Type Unified Soil <br /> Classification <br /> Brown poorly graded sand, <br /> 0-1 fine grained sand, dry, SP <br /> moderate cementation <br /> B1 1 - 7.5 Dark brown silt, dry, stiff ML <br /> Brown poorly graded sand, <br /> 7.5 - 15.5 fine-grained sand, dry, SP <br /> weak cementation <br /> Facilities I Environmental I Geotechnical I Materials 10 <br />