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Page 15 - #120-10689 <br />penetration resistance or N value. The N value is an index of the <br />relative density of cohesionless soils and the consistency of cohesive <br />soils. Thin wall tube samples were obtained according to ASTM: D <br />1587-67 where indicated by appropriate symbol on the boring logs. Rock <br />core samples were obtained by rotary drilling in accordance with ASTM: <br />D 2113-70. <br />Borings 5-83 and 6-83 were put down with a 6" power auger and only <br />disturbed samples were recovered. Because of this method, our <br />determinations of the depth and extent of the various layers of soil <br />and the consistency of cohesive soils are only approximate. <br />Soil Classifications <br />As the samples were obtained in the field, they were visually and <br />manually classified by the crew chief in accordance with ASTM: D <br />2488-69„ Representative portions of the samples were then returned to <br />the laboratory for further examination and for verification of the <br />field classification. In addition, selected samples were submitted to <br />a program of laboratory tests. Logs of the borings indicating the <br />depth and identification of the various strata, the N value, the <br />laboratory test data, water level information and pertinent <br />information regarding the method of maintaining and advancing the <br />drill holes are attached. Charts illustrating the soil classification <br />procedure, the descriptive terminology and symbols used on the boring <br />logs are also attached. <br />S®IL exPLORation <br />