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SIGNET STL Project No. 0010771 <br /> —� TL-sdng Labs Page 5 <br /> GROUNDWATER <br /> Test boring locations were checked for the presence of groundwater during and immediately following <br /> the drilling operations. Free groundwater was not encountered. <br /> It should be recognized that water table elevations might fluctuate with time, being dependent upon <br /> seasonal precipitation, irrigation, land use, and climatic conditions as well as other factors. Therefore, <br /> water level observations at the time of the field investigation may vary from those encountered during <br /> the construction phase of the project. The evaluation of such factors is beyond the scope of this report. <br /> PERCOLATION TESTING <br /> Two percolation tests were performed in the location of the proposed retention basin at the . _ est <br /> Qortion of the site. The percolation borings were drilled to a maximum depth of six feet below existing <br /> _ site grade, the elevation of the proposed basin bottom. After drilling, 3%cinch diameter plastic <br /> perforated pipes were placed in the test holes and the annularsnaces were filled with #30 sand. The <br /> test holes were presoaked for a minimum of 24 hours and then re-hydrated. The results of our test <br /> ` determinations are presented for your consideration: �— <br /> SUMMARY OF PERCOLATION TEST RESULTS <br /> Location Soil Description Depth percolation Rate <br /> South End Fine Sandy Silt (ML) 5 feet 37 min./inch <br /> North End Fine Sandy Silt (ML) 6 feet17 min./inch <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the findings of our field and laboratory investigations, along with previous geotechnical <br /> experience in the project area, the following is a summary of our evaluations, conclusions and <br /> recommendations. <br /> Administrative Summary. <br /> In brief, the subject site and soil conditions appear to be conducive to the development of the project. <br /> The upper twelve to eighteen inches of soil had fair to moderate strength characteristics but were <br /> _ moderately compressible when saturated. The soils encountered below this depth exhibit moderate <br /> strength characteristics and were only slightly compressible. <br /> Therefore, it is recommended that the upper 18 inches of soil within the proposed building pads and <br /> paved areas be scarified, properly moisture conditioned, and compacted to a minimum of 90 percent of <br /> the maximum laboratory dry density as determined by ASTM Test Method D1557. <br /> "' 1417 No. Market Blvd.,Suite 1 • Sacramento,CA 95834 • (916)568-5858 • Fax: (916)568-5813 <br />