20 Civic Center Plaza - Soils Report

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Gri#in Really SA. Inc.-Geotechnical Investigation Law/Crandall Project 70131-7-0261.0001 July 7,1997 APPENDIX A EXPLORATIONS AND LABORATORY TESTS EXPLORATIONS The soil conditions beneath the site were recently explored by drilling two borings. In addition, data were available from our prior investigation at the site (our Job No. 58338). The locations of our current and prior borings are shown in Figure 1. The current borings were drilled to depths of 68% and 70 feet below the existing grade using 18-inch-diameter bucket-type drilling equipment. Caving and raveling of the boring walls occurred as indicated on the boring logs; however, easing or drilling mud was not used to extend the borings to the depths drilled. The soils encountered were logged by our field technician, and undisturbed and bulk samples were obtained for laboratory inspection and testing. The logs of the current borings are presented in Figures A-1.1 through A-1.2; the logs from prior borings are presented in Figures A-1.3 and A- 1.5. The depths at which the undisturbed samples were obtained are indicated to the left of the boring logs. The number of blows required to drive the Crandall sampler 12 inches is indicated on the logs. The soils are classified in accordance with the Unified Soil Classification System described in Figure A-2. LABORATORY TESTS Laboratory tests were performed on selected samples obtained from the borings to aid in the classification of the soils and to determine their engineering properties. The field moisture content and dry density of the soils encountered were determined by performing tests on the undisturbed samples. The results of the tests are shown to the left of the boring logs. A-1