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Geotechniwl Data Report Bruce Park Dam Bowie Resources, Limited Apri1200t Section 5 -Laboratory Testing Proaram 5.1 General Advanced Tetra Testing, Lakewood, Colorado, performed the laboratory testing under subcontract to GEI. Laboratory tests were performed in general accordance with methods established by the American Society for Testing and Materials (ASTi~1). Laboratory tests included Atterberg Limits, Grain Size Distribution, Hydrometer Analysis, Consolidation, Unconfined Compressive Strength, Triaxial Shear Strength, Flexible Wall Permeameter, and Standard Proctor. Results of laboratory tests are presented in Appendix C and summarized in the following sections and Table 2. The embankment soils described in the following paragraphs have been divided into "old" and "new" embankment materials based on a distinct color change observed during drilling and sampling in Boring BD-105. The "new" embankment materials were considered to be those placed during the 1950s raise of the dam. The older embankment materials are assumed to be the distinctly dazk brown materials while the newer embankment materials are grays and lighter browns. 5.2 Atterberg Limits Atterberg Limits tests were performed on seven samples; two from the "new" embankment fill, two from the "old" embankment fill, and three from the foundation materials. The Atterberg Limits test (ASTM D-4318) is considered an index test and provides a relationship between the moisture content and the plastic behavior of a soil. The range of measured liquid limits aze: 46 to 53 for the "new" embankment fill; 31 to 39 for the "old" embankment fill; and 35 to 50 for the foundation materials. The range of plasticity indices are: 30 to 33 for the "new" embankment fill; 13 to 19 for the "old" embankment fill; and 20 to 33 for the foundation materials. GEI COnSUltantS, Inc. 9 992520~~-~6 Geoiecnnical Oau Report