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STâ–¡Rl.a,® <br />Materials Technology Stork Twin City Testing Corporation <br />FIELD EXPLORATION PROCEDURES <br />Soil Sampling <br />Soil sampling was performed in accordance with ASTM D 1586. Using this procedure, <br />a 2" O.D. split barrel sampler is driven into the soil by a 140 pound weight falling 30". <br />After an initial set of 6", the number of blows required to drive the sampler an additional <br />12" is known as the penetration resistance, or N value. The N value is an index of the <br />relative density of cohesionless soils and the consistency of cohesive soils. Thin wall <br />tube samples were obtained according to ASTM D 1587 where indicated by the <br />appropriate symbol on the boring logs. Rock core samples, if taken, were obtained by <br />rotary drilling in accordance with ASTM D 2113. Power auger borings, if performed, <br />were done in general accordance with ASTM D 1452. <br />Soil Classification <br />As the samples were obtained in the field, they were visually and manually classified by <br />the crew chief in accordance with ASTM D 2488. Representative portions of the <br />samples were then returned to the laboratory for further examination and for verification <br />of the field classification. Logs of the borings indicating the depth and identification of <br />the various strata, the N value, the laboratory test data, water level information and <br />pertinent information regarding the method of maintaining and advancing the drill holes <br />are attached. The descriptive terminology and symbols used on the boring logs are <br />also attached. <br />;s: Stork Twin City Testing Corporation is an operating united of Stork Materials Technology B.V., <br />T, ~_!Y test:inca Amsterdam, The Netherlands, which is a member of the Stork group