The 7th Street Bridge is located over the Tuolumne River in Stanislaus County. The existing structure (built in 1916) is classified as structurally deficient and will be replaced. The new structural design is an eight-span bridge about 1240 feet long, supported on 36-inch and 108-inch diameter cast-in-drilled-hole pile foundations.
PARIKH provided geotechnical investigation services. Scope of work included field exploration with cone penetrometer (CPT) instrumentation, laboratory testing, engineering analyses, and geotechnical design. Liquefiable soils were discovered at the project location. PARIKH prepared a foundation report with recommendations for pile foundations with liquefaction mitigation, lateral spreading considerations, scour considerations, approach embankment fill, settlement, and global stability. Recommendations were also provided for three retaining walls (an MSE and two cantilever walls) and structural pavement sections.