GEO TECHNICAL INVEST/GA T/ON <br />OAKLEIGH MEADOWS COHOUSING <br />EUGENE, OREGON <br />BACKGROUND <br />A ± 2.4-acre parcel located at the southeast end of Oakleigh Lane in Eugene <br />(Figure 1 A, Appendix A) is to be developed. The proposed development includes <br />seven, one and two-level buildings (with a total of 28 housing units), a common <br />house, garages and carports, and at-grade parking. The structures will be <br />supported on spread footings with slab-on-grade construction. A site layout <br />showing the proposed development is shown in Figure 2A (Appendix A). <br />McCamant & Durrett Architects is the project architect and Willard C, Dixon <br />Architect, LLC is the project manager. Foundation Engineering, Inc. (FEI) was <br />retained to provide the required geotechnical services for the project. Our scope of <br />work and cost estimate were provided in a proposal dated January 7, 2013, and <br />subsequently authorized by a signed Professional/Technical Services Agreement <br />dated January 23, 2013. <br />FIELD EXPLORATION <br />Ten exploratory test pits (TP-1 through TP-10) were dug at the site on <br />January 30, 2013, using a Ford 555A rubber-tired backhoe. The approximate <br />locations of the test pits are shown in Figure 2A. <br />The test pits extended to maximum depths ranging from ± 3 to 11.5 feet below the <br />existing ground surface. The shallow test pits TP-12 through TP-14 were intended <br />to establish subgrade conditions below the proposed driveway and parking stalls. <br />Disturbed soil samples were obtained for possible laboratory testing. One <br />relatively undisturbed sample was obtained near the surface using a hand-driven, <br />thin-walled Shelby tube. Undrained shear strength measurements were made on <br />the test pit sidewalls using a field vane shear device. Following the completion of <br />the explorations, the test pits were backfilled with the excavated material. <br />The soil profile and sampling depths are summarized on the appended test pit logs <br />(Appendix B). The test pit logs were prepared based on a review of the field logs, <br />an examination of the soil samples in our office, and the laboratory test results. <br />Ground elevations shown on the logs were estimated based on the topographic <br />map and are approximate only. The subsurface conditions are discussed below. <br />DISCUSSION OF SITE CONDITIONS <br />Topography and Vegetation <br />The east and west portions of the site are relatively flat and are separated by <br />modestly sloping terrain. A topographic survey by Page Engineering & Surveying <br />Inc. indicates the ground elevations range from ± El. 399 at the east side of the site <br />Oakleigh Meadows Cohousing February 12, 2013 <br />1 446 Geotechnical Investigation Project 2131004 <br />Eugene, Oregon 1 • Willard C. Dixon Architect, LLC <br />