CE&G was retained as a subconsultant to GEI for the Alameda County Flood Control and Water Conservation District’s project to raise the levee and redesign floodwalls. The improvements included installing a floodwall along the existing levee crest waterside hinge line and placing and compacting low permeability fill to raise the existing levee grade. The floodwall will be constructed on a reinforced concrete pile cap supported by a cast-in-drilled-hole pile foundation and be 2-4 feet above the existing ground surface. Services included preparing full PS&E for wingwalls and floodwalls, preparing a design memorandum, and assisting with the FEMA certification.
Zone 5 Line M, Union City, California
CE&G completed a geotechnical investigation, geotechnical report, and floodwall design for the improvement of a flood control channel and outfall structure in Union City. The project included investigations and design of 1,250 linear feet of pile supported floodwalls on an existing earth lined flood control channel. The project also included widening of the existing channel at the outfall structure, design of a new outfall structure headwall, end wall, wingwalls, and sluice gate well. Plans, specifications, and engineer’s estimate were provided to the District as project deliverables.
3959 Whitman Way, San Jose
CE&G was retained as part of a team of structural and geotechnical engineers and geologists to complete a landslide study, and Landslide Displacement Hazard Analysis (LDHA), and provide geotechnical design recommendations to prevent catastrophic failure due to an earthquake. The project includes three adjacent pipelines that service the Penitencia Water Treatment Plant (PWTP) which is located over the slow-moving Penitencia Creek Landslide. All three pipelines cross the stable Santa Clara Valley floor onto the landslide mass. The Penitencia Force Main (PFM), a 66-inch pipeline owned by the Santa Clara Valley Water District (District); Penitencia Delivery Main (PDM), a 60-inch pipeline, also owned by the District; and the South Bay Aqueduct (SBA), a 72-inch pipeline, owned by the California Department of Water Resources.
In 1983, the PDM pipeline failed due to large compressive forces from landslide movement and flexible expansion/contraction joints were installed within a vault to house the new joint assemblies. In 2004, the pipeline joints in the Penitencia Vault were replaced because they had compressed beyond the recommended levels. In 2011, observation of the flexible coupling adapter at the PDM Effluent Vault determined that it was near failure. Although the landslide movement is relatively slow, there is the potential for vertical and horizontal movement that could exceed the limitations of the existing joints during a large earthquake event.
CE&G’s scope included meetings and consultations with the project team, completion of seismic analysis of landslide, management of the geotechnical investigation, geotechnical review of design documents, evaluation of existing data, development and implementation of a subsurface exploration and laboratory testing program, engineering analyses, evaluation of existing implementation and development of a long-term geotechnical monitoring plan, preparation of a technical memorandum regarding Landslide and Seismic Hazards Evaluation, and development of geotechnical analyses models for alternatives feasibility. CE&G also coordinated with DWR, SCVWD, and the PWTP, during the project.
Mountain View, California
CE&G provided geotechnical engineering services for resurfacing of 6 miles of the San Francisco Bay Trail between Google’s headquarters in Mountain View and Highway 237 in Sunnyvale. The trail is situated atop existing levees owned by United States Fish and Wildlife Service’s Don Edwards San Francisco Bay National Wildlife Refuge and Santa Clara Valley Water District, and is surfaced with gravel. The trail is to be resurfaced with additional aggregate base as required to support PG&E maintenance vehicles and then capped with a smooth aggregate wearing course consisting of stabilized quarry fines. Work included site reconnaissance, 12 shallow hand-dug test holes, laboratory testing, engineering evaluations, and conclusions and recommendations for resurfacing of the trail and stabilizing eroded levee reaches.
CE&G provided review of Construction Quality Assurance Monitoring for construction of new cells at the municipal landfill in Fairmead, California. CE&G services included field testing during grading, testing of the clay liner, and logging and testing of geosynthetic liners. Work also included a subsurface geotechnical exploration, slope stability and settlement analyses, and review of cell construction plans and specifications.
CE&G provided Construction Quality Assurance Monitoring for construction of new cells at Avenal Regional Landfill. Services included field testing during grading, field testing of clay liner, and logging and field testing of geosynthetic liners.
1220 Paso Robles Street, Paso Robles, California
CE&G conducted slope stability analysis for an access road on the slope of an existing lined municipal solid waste landfill. Work consisted of analyzing cross sections for stability with daily equipment loading on the geosynthetic lined landfill cell.
CE&G conducted a geotechnical investigation at the Ukiah Landfill to provide recommendations for the purpose of reopening the closed landfill. Work consisted of logging 5 geotechnical borings, 3 exploratory test pits, and 14 CPT’s.
11 Spinnaker Way, Berkeley, California
CE&G conducted and prepared a geotechnical investigation and report for a replacement flare foundation at the Berkeley Landfill. The project consisted of review of existing boring logs, selection of laboratory testing from the subsurface drilling operation, analysis of existing project documents, and providing foundation recommendations in a geotechnical report for a replacement flare founded on 40 feet of waste and Bay Mud.
14201 Del Monte Blvd, Marina, California
CE&G provided Construction Quality Assurance Monitoring during construction of 23 acres of new cells at the Monterey Peninsula Landfill for the Monterey Regional Waste Management District. The project included field testing during grading, field testing of the clay liner, and logging and field testing of geosynthetic liners.
Walnut Creek Office
1870 Olympic Blvd.
Walnut Creek, CA 94596
p: (925) 935 – 9771
f: (925) 935 – 9773
Oakland Office & Lab
119 Filbert Street
Oakland, CA 94607
p: (510) 451 – 2350
f: (510) 451 – 1735