CE&G conducted a geotechnical investigation at the Sacramento Municipal Utility District’s Cosumnes Power Plant. Our services included pile analyses, review of boring logs and consolidation test data, review of settlement analysis, coordination of drillers, laboratory testing, and preparation of the geotechnical report and geology and pile recommendations. Work also included review and evaluation of potential soil improvement techniques and costs for tanks and cooling towers, along with development of indicator pile and pile load test program specifications.
CE&G provided site reconnaissance to observe existing site conditions, review of a previous geotechnical report and related site-specific documents, updates to the site seismic design parameters in accordance with current building codes, review of proposed design, and preparation of a report. The new substation and foundation at Younger Yard Substation 15A was proposed to be an at-grade facility with crawl space to facilitate cable pulling.
Construction of new facilities, drilled piers, pre-engineered buildings, MPAC mat foundations and transformer mat foundations were all included as part of PG&E’s planned improvements to the Humboldt substation in Eureka, California. CE&G completed a geotechnical exploration including review of soil and geologic maps, drilling and sampling of eight borings, evaluation of materials, laboratory testing, resistivity testing, engineering recommendations, and preparation of a report.
CE&G completed a geotechnical exploration and prepared a report for the planned improvements to the PG&E Mesa Substation project located on Hutton Road near Joshua Street in Nipomo, California. The report developed information regarding the surface and subsurface soil conditions at the site and provided design level geotechnical engineering recommendations for site grading and for the design of foundation systems for the proposed new structures and associated improvements.
Hiddenbrooke Parkway, Vallejo, California
In accordance with our on-call agreement for engineering and testing services for the City of Vallejo, CE&G, in conjunction with three subconsultants, provided surveying, civil engineering, and landscape architecture services to the City of Vallejo for construction of the Hiddenbrooke Park Project. The project is currently in the construction phase. The park project will include construction of pervious parking lot, open lawn for informal play, prefabricated restroom building, 1/2 basketball court, picnic tables with shade structures, a water play area, tot play area, school age play area, bocce courts, an equestrian parking area, and open space trails. The project will be designed to meet C3 requirements with no allowable runoff from the site.
CE&G is the prime consultant for the project in charge of project management and coordination with subconsultants for providing surveying, plans, specifications, and engineers estimate for the 2 acre, $1.5 million park project.
SF Bay Trail, Crockett to Martinez, Martinez, California
As a consultant to Contra Costa County in 2002, Cal Engineering & Geology provided the geotechnical engineering, preliminary civil design, and planning services for the conversion of the 1.7 mile long abandoned section of Carquinez Scenic Drive between Ozol and Port Costa in Contra Costa County. The section of the road, which was being studied, was abandoned by the county in 1983 following the development of several large landslides which made the road impassable. The geotechnical investigation completed for the project included drilling of 14 exploratory borings, laboratory testing, geologic mapping, and preparation of a preliminary geotechnical report. The Design Alternatives Report provided conceptual level alternatives for addressing the geotechnical hazards along the road. Site specific and generalized typical details for repairs consisting of tieback retaining walls, geogrid reinforced embankments, stabilization piles, soldier beam and lagging walls, and pavement stabilization were developed and presented with preliminary engineer’s estimates.
In 2011, Cal Engineering & Geology was once again retained to provide geotechnical engineering and value engineering services on the project, this time as a subconsultant to the East Bay Regional Park District, who would develop the final design and construct the federally funded trail. CE&G was involved in the value engineering process to assist the design team to optimize the trail configuration at the large landslides. The supplemental geotechnical investigation completed for the project included drilling of 26 additional exploratory borings, laboratory testing, geologic mapping, and preparation of a design and materials report in Caltrans format complete with Log of Test Boring sheets. CE&G recently provided observation of pile drilling for debris walls and retaining walls.
CE&G was retained to provide an independent third party geotechnical and geologic review of three planned residential development projects, Dublin Ranch, Fallon Village, and Moller Ranch, in the east Dublin hills. These three projects were each multi-year, major residential subdivisions with multi-million cubic yards of hillside earthwork.
CE&G met with the developer’s geotechnical consultant and the City to understand the scope of the project from a geotechnical perspective and then completed a geotechnical peer review of planned mass grading for the development which was to be completed over several years. Based on the review, the scope of remedial grading and monitoring of deep fills at the site were revised and grading permits were issued. During the mass grading operations for the project, CE&G’s Principal Geologist, Mitch Wolfe, provided special geological observations on behalf of the City. The geologic observations were focused on confirming subsurface conditions during grading and reviewing modifications proposed by the developer’s geotechnical consultant. Grading took place over several years and included over 8 million cubic yards of earthwork and repair of numerous large ancient bedrock landslides in a hillside environment. After the completion of the project, a Geologic Hazard Abatement District (GHAD) was created. CE&G reviewed the proposed Plan of Control and Engineer’s Report which formed the basis of the GHAD formation and provided detailed recommendations to the City regarding suggested changes to those documents prior to their approval and adoption.
Memorial Park Trail Near Mission Boulevard, Hayward, California
CE&G provided full design, PS&E, value engineering, and construction observation and testing services to the Hayward Area Recreation District (HARD) for two portions of the Memorial park trail damaged during intense storms. At both sites, the trail width had been reduced by creek bank failures and resulted in designs which were bid, but exceeded available funding. CE&G developed alternate designs and prepared plans and technical specifications to improve constructability and reduce cost. Both projects were approved by FEMA for funding and later constructed. At one site, the repair consisted of a geogrid reinforced segmental block retaining wall supported on a pier and grade beam foundation while at the other site a wood lagging and steel beam retaining wall was used. The project required coordination with HARD and the City of Hayward due to a sewer line located within the trail. For both projects, CE&G also completed construction observation and testing services for the trail stabilization measures including: review of contractor submittals, phone and email communication with the District and the contractor’s representative, part-time observation of the pile hole drilling operation, concrete testing, observations of wall construction, preparation of progress letters, and preparation of a final construction report.
Bair Island, Redwood City, California
Working as a subconsultant, CE&G completed a geotechnical exploration for a proposed new 48-inch forced sewer main near Bair Island Slough in Redwood City, California. The new line is to be constructed by microtunneling in old bay mud deposits with several deep launching and receiving shafts. Duties for the project included historical research of the project area, collection of previous exploration data, coordination with local and state permitting agencies, coordination with multiple consulting and development agencies, coordination with the drilling subcontractors, field investigation, laboratory testing selection, and report development. The field investigation included four over-water exploratory borings utilizing a barge mounted drilling rig. The barge drilling rig was launched in coordination with the state and local agencies and private resident of the area and transported several miles along the San Francisco Bay creeks and waterways to the exploration location. The drilling operation lasted four days. The exploration required constant adjustment for tidal influences to maintain the near continuous sampling interval required for up to 92.5 feet below the sediment floor of the San Francisco Bay margin soils.
In accordance with our on-call service agreement with the City of Vallejo, Cal Engineering & Geology provided quality assurance testing services for a sewer rehabilitation project on Mare Island in 2011. The project consisted of new asphalt concrete pavement and slurry sealing at various sanitary sewer pump stations, installation of approximately 2000 lineal feet of 22-inch HDPE sewer main, boring and jacking of 32-inch steel casing at three locations, and preparation for the installation of five new emergency back-up generators. During the course of work, Cal Engineering & Geology attended weekly progress meetings, sampled and tested baserock materials, and performed field density testing of the placement of baserock and asphalt concrete. Field reports were delivered to the Public Works division on a timely basis, with a final quality assurance testing letter issued at the conclusion of the work. The services were provided on an as-needed, intermittent basis with 30 site visits over a two month period. This efficiency resulted in cost control that utilized only 47 percent of the estimated budget.
Walnut Creek Office
785 Ygnacio Valley Road
Walnut Creek, CA 94596
p: (925) 935 – 9771
f: (925) 935 – 9773
Hayward Office & Lab
23785 Cabot Blvd.
Hayward, CA 94545
p: (510) 451 – 2350
f: (510) 451 – 1735