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Sail Suitability / Nitrate Loading Study <br />Morada Produce — Ag Processing Building a Stockton, California <br />May 14, 2021 a Terracon Project No. NA217014 <br />lierracon <br />Boring Depth Interval (ft) Soil Type Unified Soil <br />Classification <br />5-9 No sample --- <br />9-10 Brown silty sand SM <br />10-14 No sample -- <br />14-15 Brown sandy silt SM <br />15-19 No sample -- <br />19-20 Brown sandy silt ML <br />20-24 No sample -- <br />24-25 Dark brown sandy silt ML <br />1.5.4 Discussion of Soil Lithology <br />The soils encountered in the percolation test borings and soil profile consisted primarily of silty <br />sand and sandy silt. Generally speaking, coarse-grained soil has a greater potential for <br />percolation than fine-grained or cemented soil. <br />Terracon searched the DWR online Well Completion Records for additional information regarding <br />soil lithology near the site. A well completion report was available for the adjoining eastern <br />property well (02N08E31_39-558). Soils were reported as "soil" from 0 to 4 feet bgs, "HP" from <br />4 to 35 feet bgs, soft clay from 35 to 48 feet bgs, three strata of hard clay between soft silty clay <br />from 38 to 150 feet bgs, firm clay from 150 to 180 feet bgs, and varying layers of "ss" and clay, to <br />417 feet bgs. <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 />Three percolation tests were performed. <br />1.6.3 Boring Preparation and Presaturation <br />The percolation test borings were excavated on April 5, 2021. Approximately two inches of "pea <br />gravel" was placed in the bottom of the open borings. A 2.0-inch diameter PVC pipe with <br />perforations towards the bottom was installed on top of the gravel and the annular space was <br />backfilled with "pea gravel". Presaturation of the percolation test holes occurred the same day <br />asive a Resourceful a Reliable 11