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� <br /> � Page 14 - #4220 91-1043 <br /> `� 6.0 FIELD EXPLORATION PROCEDURES , <br /> 6.1 Soil Sampling <br /> Soil sampling was performed in accordance with ASTM:D1586-84. Using this procedure, <br /> a 2" O.D. split barrel sampler is driven into the soil by a 140 lb weight falling 30". <br /> — After an initial set of 6", the number of blows required to drive the sampler an <br /> additional 12" is known as the penetration resistance or N value. The N value is an <br /> index of the relative density of cohesionless soils and the consistency of cohesive soils. <br /> 6.2 Soil Classification <br /> �_ As the samples were obtained in the field, they were visually and manually classi�ed by <br /> the crew chief in accordance with ASTM:D2487-85 and D2488. Representative portions <br /> of the samples were then returned to the laboratory for further examination and for <br /> verification of the field classification. In addition, selected samples were submitted to <br /> . <br /> a program of laboratory tests. Logs of the borings indicating the depth and identification <br /> r of 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. Charts illustrating the soil classification procedure, the descriptive <br /> terminology and symbols used on the boring logs are also attached. <br />