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. , <br /> ' Page 9 - #4220 92-4026 <br /> 5 0 FIELD EXPLORATION PROCEDURES <br /> 5.1 Soil Sampling <br /> Soil sampling was performed in accordance with ASTM:D1586-84. Using this procedure, a 2" O.D. split <br /> barrel sampler is driven into the soil by a 140 lb weight faliing 30". Aftec an initial set of 6", the <br /> number of blows required to drive the sampler an additional 12" is known as the penetration resistance <br /> . or N value. The N value is an index of the relative density of cohesionless soils and the consistency of <br />-� cohesive soils. - <br /> 5.2 Soil Classification <br />-.J <br />� As the samples were obtained in the field, they were visually and manually classified by the crew chief <br /> in accordance with ASTM:D2487-85 and D2488. Representative portions of the samples were then <br />_ returned to the laboratory for further examination and for verification of the field classification. In <br /> addition, selected samples were submitted to a program of laboratory tests. Logs of the borings . <br /> indicating the depth and identification of the vazious strata, the N value, the laboratory test data, water <br /> level information and pertinent information regarding the method of maintaining and advancing the drill <br />-- holes are attached. Charts illustrating the soil classification procedure, the descriptive terminology and <br /> symbols used on the boring logs are also attached. <br />--• � tw�n c�t� test�nq <br />