ESBGU <br />Site Preparation for the Building <br />11.Strip the existing ground as required to remove soft soils, organics, and <br /> <br />existing pavements. Dispose of all strippings outside of construction <br />areas. <br />12.Overexcavate any test pits that extend beneath the building footprint and <br />replace thebackfill with compacted BaseAggregate. The approximate <br />test pit locations are shown on Figure 3A (Appendix A). <br />13.Excavate the building area to the required grade. The excavation should <br /> <br />provide a building pad consisting of a minimum of 12 inches of Base <br />Aggregate beneath the slab.The foundation excavation should be <br />completed using a hoe equipped with a smooth bucket to minimize <br />subgrade disturbance. Do not allow the completed subgrade to dry out <br />excessively or become saturated prior to placing the Base Aggregate. <br />Compact the Base Aggregate as recommended in Item 3. <br />14.Trench for the footing locations using an excavator equipped with a <br /> <br />smooth-edged bucket to provide a minimum of 6 inches of Base <br />Aggregate beneath the footings. The Base Aggregate should extend at <br />least 6 inches beyond the edges of the footings. Any loose or disturbed <br />soil should be removed prior to backfilling. Compact the Base Aggregate <br />as recommended in Item 3. <br />15.Grade the finished ground surface surrounding the building to promote <br /> <br />drainage away from the foundations. <br />Pavement Design and Construction <br />16.Strip the subgrade in the pavement areas as required to remove soft soils, <br /> <br />organics and existing pavements. Dispose of all strippings outside of <br />construction areas. <br />17.Excavate to the planned subgrade elevations and compact the subgrade <br /> <br />to a depth of 12 inches as recommended in Item 3. <br />dump <br />18.Proof-roll the compacted subgrade surface using a loaded, 10-yd <br />3 <br /> <br />truck or other approved vehicle prior to placing Base Aggregate. Areas of <br />pumping or deflection observed beneath the truck wheels may be <br />reworked or overexcavated and replaced with compacted Base Aggregate <br />and proof-rolled again. <br />19.Place the Separation Geotextile over the prepared subgrade in accordance <br /> <br />with ODOT Section 00350. The Subgrade Geotextile should be laid flat <br />over the subgrade and pulled tight to remove wrinkles. A minimum of ±2 <br />feet of overlap should be provided between adjacent rolls of the Subgrade <br />Santa Clara Transit Center January 15, 2019 <br />Geotechnical Investigation 10 Project 2181060 <br />Eugene, Oregon Rowell Brokaw <br />