Laserfiche WebLink
Soil Suitability /Nitrate Loading Study Irerracon <br />ALL STAR HEAVY HAUL & TOWING INCORPORATED Tracy, California <br />July 1, 2022 Terracon Project No. NA217024 <br />Boring <br />Depth Interval (feet) <br />Soil Type <br />Unified Soil <br />Classification <br />Grey pale with orange <br />8.0-11.0 <br />rusting, fine grained, stiff, <br />CL -ML <br />silty clay <br />Grey with orang, coarse <br />11.0-21.0 <br />grained, stiff, hard, <br />medium compaction, siity <br />SM <br />sand <br />Brown with grey, hard, <br />21.0-25.0 <br />stiff, high compaction, <br />CL <br />clay <br />Grey with brown, hard, <br />25.0-26.5 <br />stiff, high compaction, <br />CL <br />clay <br />1.5.4 Discussion of Soil Lithology <br />T he soils encountered in the percolation test borings consisted generally of clay or clay with silt. <br />Refer to Section 1.5.3 for a more detailed Lithology. Generally, coarse-grained soil has a greater <br />potential for percolation than fine-grained or cemented 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 at 23.4 <br />feet bgs, B2 at 9.00 feet bgs, and B3 at 3.32 feet bgs) were conducted and witnessed by Mr. <br />Naseem Ahmed, EHD representative. <br />1.6.3 Boring Preparation and Presaturation <br />The percolation test borings were excavated on June 13th, 2022. Approximately two inches of <br />"pea gravel" was placed in the bottom of the 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 on June 13th, <br />2022 approximately 24 hours prior to the day of testing. The depth of water used to pre-soak the <br />shallow borings was approximately 1.0 foot above the top of the gravel and 0.5 feet above the top <br />of gravel for the deep boring. <br />Responsive ■ Resourceful ■ Reliable 12 <br />