2000 TOWER ST ARTS AND SCIENCES BLDG 2018-01-02 MF Import

IFIELD EXPLORATION AND LABORATORY TESTING FIELD EXPLORATION I Subsurface conditions were evaluated through a field exploration program that consisted of drilling and sampling five hollow -stem auger borings drilled within the building footprint using truck -mounted drilling equipment. The locations of the borings are shown on the Site and Exploration Plan, Figure 2. The borings, designated B-1 through B-5, were advanced to depths ranging Fnm 21 to 36%: feet below the ground surface. Locations of the borings were determined in the field by pacing to existing site features such as the sidewalks and the existing landscape islands. Elevations at the boring locations were estimated from the site survey map provided by Pertcet Engineering dated February 19, 2004 and used as a base for our ` Figure 2. The respective ground surface elevations are shown on the boring logs in Appendix A. Appendix A includes logs of the borings (Figures A-3 through A-7) and details of the subsurface explorations performed. LABORATORY TESTING Soil samples obtained from the explorations were transported to our laboratory and examined to confirm or modify field classifications, as well as to evaluate engineering properties of the soil. Representative samples were selected for laboratory testing consisting of moisture content and sieve analyses. The tests were performed in general accordance with test methods of the American Society for Testing and Materials (ASTM) or other applicable procedures. Appendix B includes a brief discussion of the laboratory tests and test results. SITE DESCRIPTION SURFACE CONDITIONS The proposed Art and Science building is situated in the existing asphalt parking lot located between Shuksan Hall and the main campus entrance road to the south. The parking lot in the area of the building footprint slopes gently down from the southwest (Elevation 121.5 feet) to the northeast (Elevation 105 feet). The parking lot has several landscape islands and is bordered on the north, east and south sides by sidewalks and landscape strips. The ground surface slopes down from the north sidewalk to Shuksan Hall with an approximately 5-foot-high slope on the cast side increasing to a 15-foot-high slope oil the west side. SITE GEOLOGY Geologic information for the project area (Minard, 1955) indicates that native surficial soils at the site are composed of glacial till, which are underlain by advance outwash deposits. Glacial till commonly consists of a very compact, poorly sorted, non -stratified mixture of clay, silt, sand, gravel and cobbles. Glacial till commonly appears gray or blue on a fresh surface, while weathered glacial till may be brown to yellow in color. Till may include large boulders. Advance outwash deposits underlie the glacial till and typically consist of a thick section of mostly clean gray, pebbly sand with gravel. I lowever, fine-grained sand and silt are common in the lower parts of the section and sparingly in the upper part on the unit. ` G c a n n g i n c e r s 2 File No. 5836.002-00/040204