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Soil Suitability / Nitrate Loading Study r ierracon <br /> FLAG CITY TRUCK AND EQUIPMENT PARKING FACILITY I Lodi, California <br /> October 6, 2023 1 Terracon Project No. NA237081 <br /> Boring Depth Interval (feet) Soil Type Unified Soil <br /> Classification <br /> 8.5 - 10.0 Brown, fine to medium, SM <br /> silty sand <br /> 1.5.4. Discussion of Soil Lithology <br /> A visual inspection of the shallow and deep soils from the test borings points to <br /> favorable conditions for shallow septic disposal systems; however, the area is known to <br /> have "hardpan" or cemented soils which have low porosity. For this reason, sumps <br /> and/or seepage pits are often used with leach lines in various areas of the county. <br /> Generally speaking, coarse-grained soil has a greater potential for percolation than fine- <br /> grained or cemented soil. Refer to Section 1.5.3 for a more detailed lithology. Generally, <br /> coarse-grained soil has a greater potential for percolation than fine-grained or cemented <br /> soil. <br /> 1.6. Percolation Test Information <br /> 1.6.1. Percolation Test Locations <br /> Refer to Section 1.5.1 and Appendix A, Exhibit 2. <br /> 1.6.2. Number of Percolation Tests <br /> A total of three percolation tests were conducted on the site. The percolation tests (131 <br /> at 9.8 feet bgs, B2 at 6.8 feet bgs, and B3 at 3.0 feet bgs) were conducted and <br /> witnessed by Ms. Aldara Salinas, EHD representative. <br /> 1.6.3. Boring Preparation and Presaturation <br /> The percolation test borings were excavated on September 28th, 2023. Approximately <br /> two inches of "pea gravel" was placed in the bottom of the borings. A 2.0-inch diameter <br /> PVC pipe with perforations towards the bottom was installed on top of the gravel and the <br /> annular space was backfilled with "pea gravel". Presaturation of the percolation test <br /> holes occurred on September 28th, 2023 approximately 24 hours prior to the day of <br /> testing. The depth of water used to pre-soak the shallow borings was approximately 1.0 <br /> foot above the top of the gravel and 0.5 feet above the top of gravel for the deep <br /> boring. <br /> Facilities I Environmental I Geotechnical I Materials 11 <br />