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Clients do not always think of their project as a "tunnel project" unless a large tunnel is the star feature. However, many pipeline projects often feature a number of smaller and shorter tunnel crossings under railroads, rivers, and highways. These small tunnel crossings deserve as much attention as the large tunnels do, as difficult ground does not discriminate on size. Tunneling Solutions has experience with a wide variety of tunnel crossings, and can help provide you with the most flexible and economical tunneling solution for your project. Some typical project descriptions are provided below:
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Groundwater Replenishment Pipeline Project (Orange County, CA). Ms. Ganse served as Project Manager and lead design engineer for this project, which consisted of approximately 14 miles of 48- to 78-inch diameter pressure pipe. The pipeline will carry treated wastewater from the Orange County Sanitation District treatment plant in Fountain Valley to the Kreamer and Miller Spreading Basins in Anaheim. More than 20 tunnel crossings were required where the pipeline crosses beneath highways, including 5 major crossings: Garden Grove Freeway, Orange Freeway, Riverside Freeway, San Diego Freeway, and Santa Ana Freeway. Project deliverables included a geotechnical baseline report, a basis of design report, technical specifications, contract drawings, and an opinion of probable construction cost.
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Upper Northwest Interceptor (UNWI) Project Sections 5 & 6 (Sacramento, CA). Ms. Ganse served as Project Manager and lead design engineer for this sewer project. Five tunnel crossings were required where the pipeline crossed beneath creeks, roadways, and utilities. The tunnels ranged from 48- to 66-inches in diameter, with a maximum length of 1.500 feet.
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Walnut Creek North Oaks Sewer Tunnel Project (Austin, TX). Ms. Ganse served as Project Manager and lead design engineer for this project, which involved four sections of new sewer line to be installed using trenchless construction methods. The trenchless crossings ranged in length from 50 to 350 feet in length, and were required due to conflicts with utilities, large trees, and roadways. The new pipeline will be 8-inch diameter pipe installed within a steel casing. Ground conditions consist of limestone bedrock and cohesive soil.
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