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i LOWRY &. ASSOCIATES Page 2A -i August 18, 1990 1 L & a No. 90-190 The soil samples were retained in 2-inch diameter by 6-inch long, thin-walled brass tubes contained within the sampler. Immediately after recovery, the samples were visually classified and the ends of the brass tubes were sealed to preserve the natural soil j moisture content. Selected samples of the surface soils were obtained in a disturbed condition. All soil samples were taken to the laboratory for classification, with selected samples designated for testing. The Boring Logs, Plates No. 2 through 11, contain descriptions of the soils encountered in each boring. The soils were classified in accordance with the Unified Soil Classification System. An explanation of that system and other symbols used on the logs appears on Plate No. 12. In addition, the boring logs show a graphical representation of the previously-defined penetration resistance or "blow count" obtained during sampling. 1 LABORATORY TESTING Selected, undisturbed samples of the soils were tested to determine dry unit weight, natural moisture content, as determined by ASTM Specification D2216; and unconfined jcompressive strength, as determined by ASTM Specification D2166. The results of these tests are included on the boring logs at the depth from which each sample was obtained. Samples of the surface and near-surface soils were subjected to Atterberg limits tests, as determined by ASTM Specification D4318, to determine the plasticity characteristics of the materials. The results of these tests are displayed on Plate No. Al. Unidimensional consolidation tests, as determined by ASTM Specification D2435, were performed on selected, undisturbed soil samples to evaluate the compressibility j properties of the materials. Graphic representations of these tests, which were used in our settlement analyses, appear on Plate No. A2. Resistance ("R") value tests, as determined by ASTM Specification D2844, were conducted on selected samples of the anticipated pavement subgrade soils. These test results, which were used in our pavement section analyses, are presented on Plates No. A3, A4 and A5. } A selected sample of the surface soil was subjected to a compaction test, as determined 1 by ASTM Specification D1557, to determine the dry unit weight-moisture content interrelationships of the material. The results of this test are shown in the form of a curve on Plate No. A6. Selected samples of the soils anticipated to be present at the lake base were subjected to flexible wall permeability tests. The results of these tests are shown on Plate No. A7.