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City of Centerville <br /> Project SP-07-03738 <br /> November 29,2007 <br /> Page 2 <br /> A.4.b. Borings <br /> Our firm performed 55 standard penetration test borings. The borings were drilled to depths ranging <br /> from about 6 to 21 feet,totaling about 436 lineal feet of drilling. The deeper borings were performed <br /> where watermain is proposed to be installed. <br /> Penetration resistance tests were performed as the borings were advanced. Penetration resistances, <br /> measured in blows-per-fool (BPF),provide an empirical means of estimating relative material density, <br /> consistency,strength and compaction. The depths at which the penetration resistance tests were <br /> performed,and the test results,are shown on the Log of Boring sheets included in the Appendix, and are <br /> discussed below in Section B. <br /> AA.c. Surveying <br /> Our firm did not obtain ground surface elevations at the boring locations. <br /> AAA. Laboratory Testing <br /> Laboratory tests were performed on selected penetration test samples to help classify them and evaluate <br /> their engineering properties. We performed six moisture content tests,six mechanical analyses(through <br /> the#E200 sieve only)and one organic content test. Our test results are shown on the boring logs and are <br /> summarized in Section B. <br /> AA.e. Engineering Evaluation and Analysis <br /> Samples were returned to our laboratory and were visually classified and logged by a geotechnical <br /> engineer. Data obtained from the borings was used to fulfill our project goals,that is: characterizing <br /> subsurface soil and groundwater conditions in the areas of the proposed street reconstruction and utility <br /> installation,and developing recommendations for utility installation,subgrade preparation and pavement <br /> design. <br /> B. Results <br /> B.I. Log of Boring Sheets <br /> The attached Log of Boring sheets classify and describe the materials encountered,and present the <br /> results of penetration resistance,laboratory tests and groundwater measurements. Geologic origins <br /> assigned to the strata shown on the logs were determined from a review of material classifications, <br /> penetration resistance,laboratory tests and geologic publications pertinent to the site and general area. <br /> 37 <br />