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F ` i g-. ~ s - GEOTECHNICAL INVESTIGATION PROPOSED COURTHOUSE SQUARE ~ SALEM, OREGON 1.0 INTRODUCTION This report presents results of a geotechnical investigation at the site of the proposed Court House Square in Salem, Oregon. The purpose of the investigation was to provide information and design guidelines for: 1) foundation design, 2) excavations, 3) site grading, 4) retaining structures, 5) floor systems, and 6) trench backfill related to the development of the office and transit mall complex. Data obtained during the field and laboratory work is summarized on the boring logs and laboratory test data sheets found in Appendices A and B of this report. The recommendations, conclusions, and opinions presented in this report are based on the laboratory and field data and our experience with similar projects. 1.1 Site Location and Description The subject facilities will occupy an entire city block in down town Salem, Oregon. The city block is bounded by High and Church Streets NE, and Chemeketa and Court Streets NE. Site location is shown on the Vicinity Map, Figure 1. The block is fully developed with existing buildings and parking areas. The Senator Hotel occupies the enrire southwestern one-quarter of the property, and most of the northeastern one-quarter is occupied by an office building. Both of these structures have basements under at least part of the building. The northwest corner of the site is a paved parking area. The remaining area, in the southeast corner, is currently vacant. The area was formerly occupied by a gasoline serviCe station, and is now the site of a series of monitoring wells and an environmental remediation system. 1.2 Proposed Construction As presently planned, the site will be occupied by a single large building. The footprint of the structure will cover most of the site, except in the southwest corner, where an entrance plaza is planned. Preliminary design is for a four story building; however, a fifth story may be included in the final design. A transit mall will be located on the ground floor. Buses will use High Street NE and Church Street NE for entry and exit. Below ground parking is included in the design. There will probably be a combination of one level and two level pazking below ground parking. Floor elevation for the single level pazking will be approximately 10 feet below grade. For areas with a second level, the elevation will be about 20 feet below grade. The below ground parking will not :~~ ~ centurywest ENGINEERING CORPORAT~ON March 7, 1997 40806.001.08 ~ ~