Holdrege & Kull provided a geohazards evaluation, geotechnical design, and construction materials testing and special inspection for two, new, two-story classroom buildings, totaling 94,900 square feet. Each building contained 18 classrooms, including chemistry and science laboratories. The two buildings were connected by a steel bridge skyway. The structures included braced steel frames and thin brick exterior façade, concrete slab-on-grade floors and raised metal deck second floors, spread and isolated footings, a hydraulic lift elevator, concrete sidewalks, and an asphalt concrete paved parking lot.
H&K initially performed a geotechnical investigation and geologic hazards evaluation in accordance with the Division of the State Architect, California Geological Survey Note 48, and 2007 California Building Code requirements. The geologic hazard evaluation identified an active fault zone (Cleveland Hills Fault) within 25 miles of the school campus. The Cleveland Hills Fault was responsible for surface rupture during the 1975 earthquake. Based on the proximity of the site to the active fault, a site-specific ground motion analysis was performed. Additional geologic hazards evaluated at the site included landslide, expansive soil, flooding, seismically induced liquefaction potential, rockfall, settlement, and lateral spreading. Geotechnical engineering recommendations were provided for earthwork grading, foundation design, concrete slab-on-grade floors, retaining walls, and pavement design.
During construction, H&K performed materials testing and special inspection of the following:
- Earthwork testing during grading following parking lot demolition. Earthwork for site preparation included removal and re-routing of underground utility lines below the building footprint; ripping and compacting the subgrade soil; observation and inspection of the foundation and elevator excavations; backfilling of underground utility installations and connections; and compaction of sidewalk, parking lot, and fire lane subgrade soil and aggregate base rock.
- Special inspection of reinforcing steel for concrete. Included shop fabrication inspection, material identification, tagging and tracking to site, sampling and conformance testing of rebar.
- Special inspection, sampling, and testing of concrete for foundations and slab-on-grade interior, elevated and exterior floors.
- Special inspection of field and shop welding, including steel material identification, welders certifications, procedures, and filler materials in accordance with AWS D1.1. Structural steel included columns, beams, trusses, studs, metal decking. Performed non-destructive ultra-sonic testing of welds during shop and field welding.
- Special inspection and materials testing of high strength bolts during field erection of the steel framing using a calibrated Skidmore-Wilhelm.
- Observation and inspection of the installation of post-installed concrete epoxy anchors, and torque testing of wedge anchors.
- Special inspection and load testing of post installed concrete ceiling anchors.
- Special inspection during spray applied fireproofing application. Sampled and tested fireproofing materials and application thickness.
Special inspection and materials testing of masonry components, such as CMU block and brick veneer