Palm Avenue Safe Routes to School – Auburn, CA

The purpose of this project was to alleviate unsafe pedestrian and bicycle access to a local middle school. The existing alignment was characterized by narrow traffic lanes, rock outcroppings along the street boundaries, and private parcels that extended into the city right-of-way. H&K’s geotechnical investigation included performing seismic refraction, hand excavating trenches, and performing dynamic cone penetrometer testing along the alignment. H&K provided recommendations for allowable cut and fill slope gradients, retaining wall design criteria, and pavement design. H&K also performed an Initial Site Assessment per Caltrans’ requirements to assess environmental conditions along the proposed project alignment. H&K was requested to perform a Phase II ISA to obtain rock samples for naturally occurring asbestos and aerially deposited lead analysis. Using a geoprobe rig, samples from the upper 2 to 3 feet of soil in road shoulders were collected on 1000-ft centers. H&K also provided materials testing services during project construction.