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• Soil Suitability/ Nitrate Loading Study 1r�rr�con <br /> Sun Valley Express Truck Center■ Acampo, California <br /> August 14, 2017 ■ Terracon Project No. NA177026 <br /> Boring Depth Interval (ft) Soil Type Unified Soil <br /> Classification <br /> 5.0- 10.0 Silty Sand, cemented, brown SM <br /> 10.0- 15.0 Silty Sand, cemented, brown SM <br /> 15.0-20.0 Sandy silt, cemented, brown SM <br /> 20.0-25.0 Clayey sandy silt, brown SC <br /> P2 3.5 Sandy Silt, brown ML <br /> 1.5.4 Discussion of Soil Lithology <br /> • <br /> A visual inspection of the shallow soils from the test hole points to unfavorable conditions for <br /> shallow septic disposal due to the surface silty soils and the underlying cemented sand and silt. <br /> These characteristics do not allow for good seepage or percolation. Generally speaking, <br /> uncemented coarse-grained soil has a greater potential for percolation than fine-grained or <br /> cemented soil. Given the presence of the upper silty and cemented soils, seepage pits should be <br /> utilized with leach lines which is typical in various areas of the county. The seepage pits should <br /> be the primary absorption method. <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 /> One shallow (3.5 feet) and one deep (25 feet) percolation test was conducted. <br />• 1.6.3 Boring Preparation and Presaturation <br /> The soil borings were excavated on June 20, 2017. Approximately two inches of "pea gravel' <br /> was placed in the bottom of the open boring. A 2.0-inch diameter PVC pipe with perforations <br /> towards the bottom was installed on top of the gravel and the annular space was backfilled with <br /> "pea gravel". Presaturation of the percolation test hole occurred approximately 24 hours prior to <br /> the day of testing on June 22, 2017. The deep boring P1 was saturated with a water column <br /> approximately 0.5 feet over gravel. The shallow boring P2 was saturated with a water column <br /> approximately 12 inches over gravel. <br /> 1.6.4 Condition of Borings after Presaturation <br /> • <br /> Responsive■ Resourceful ■ Reliable 9 <br />