Placer County Water Agency
Placer County, CA
2013 – 2015
Located approximately 1.5 miles north-northeast of the City of Colfax, the Long Ravine Pipeline Replacement included a crossing of Interstate 80 and had portions of pipeline adjacent to Union Pacific Railroad lines. Blackburn Consulting prepared a Preliminary Geotechnical Design Report and a Geotechnical Design Report for the project.
Blackburn provided recommendations to mitigate common foothill geotechnical challenges such as rock excavation, trenchless crossings, steep slopes, and design of support structures. Geotechnical evaluation included mapping of geologic conditions, drilling and trenching, review for potentially unstable slopes, railroad embankment fill stability, and determination of tunneling constraints/design parameters.