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Custom Soil Resource Report <br />Percentage (of soil particles) passing designated sieves is the percentage of the soil <br />fraction less than 3 inches in diameter based on an ovendry weight. The sieves, <br />numbers 4, 10, 40, and 200 (USA Standard Series), have openings of 4.76, 2.00, <br />0.420, and 0.074 millimeters, respectively. Estimates are based on laboratory tests of <br />soils sampled in the survey area and in nearby areas and on estimates made in the <br />field. <br />Liquid limit and plasticity index (Atterberg limits) indicate the plasticity characteristics <br />of a soil. The estimates are based on test data from the survey area or from nearby <br />areas and on field examination. <br />References: <br />American Association of State Highway and Transportation Officials (AASHTO). 2004. <br />Standard specifications for transportation materials and methods of sampling and <br />testing. 24th edition. <br />American Society for Testing and Materials (ASTM). 2005. Standard classification of <br />soils for engineering purposes. ASTM Standard D2487-00. <br />21