Holdrege & Kull provided geotechnical engineering and materials testing services for the Town of Truckee and Caltrans on one of the state’s first two-lane roundabouts at the intersection of Interstate 80 and State Route 89. To accommodate the proposed widening of State Route 89, a portion of the east and west freeway abutments were to be removed for the construction of retaining walls. H&K evaluated lateral resistance and vertical capacity of existing driven piles supporting the I-80 over-crossing. The project was constructed on a fast-track path and was substantially completed in one construction season with minimum traffic disruption during the peak visitor season. Our Caltrans certified inspectors provided compaction testing during underground utility construction, laboratory testing, and concrete and asphalt concrete sampling and testing. We also analyzed existing driven piles for stability issues.