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603284-001 <br />crushed rock was installed in the annulus from the bottom of the boring to the <br />adjacent ground surface; the crushed gravel was installed to prevent caving <br />of the loose, unconsolidated sands. <br />• A 55-gallon steel drum was fitted with a valve near the bottom of the drum <br />and a measuring device was installed inside the drum. Once filled with water, <br />the drum and measuring system was calibrated by measuring the amount of <br />time it took to fill a 5-gallon bucket from the valve. The decline of water in the <br />drum was measured in hundredths of inch increments during the tests and <br />the measurements were converted to gallons. <br />• Each in-situ field permeability test was performed by filling the test well and <br />maintaining a constant elevation in the well. The water level was maintained <br />at this level by allowing water from the 55-gallon steel drum to drain directly <br />into the well from the valve. Flow of the water into the well and the water <br />level was maintained using a gate valve. Flow/drum volume measurements <br />were taken at two to five minute intervals. The field data collected and the <br />calculated percolation rate for each well are presented in Appendix B. <br />Task 4 - Laboratory Testing <br />Geotechnical laboratory testing was performed on selected soil samples obtained <br />during our field exploration. The geotechnical laboratory testing program was <br />designed toward a quantitative and qualitative evaluation of the physical and <br />engineering characteristics of the onsite soils underlying the project site. The <br />program consisted of testing selected representative specimens, prepared from <br />representative samples, of the earth materials to obtain the following properties <br />and characteristics: <br />• Soil classification (ASTM D2488); <br />• In-situ moisture content and dry density (ASTM D2216, D2937); <br />• Compaction (ASTM D1557); <br />• Expansion Index (ASTM D4829); <br />• Atterberg Limits (ASTM D4318) <br />• Direct Shear (ASTM D3080); <br />• Consolidation (ASTM D2435); <br />-4- <br />Leighton