North American Society for Trenchless Technology defines microtunneling as: A trenchless construction method for installing pipelines. Microtunneling uses all of the following features during construction: Remotely controlled - The microtunneling boring machine (MTBM) is operated from a control panel, normally located on the surface. The system simultaneously installs pipe as spoil is excavated and removed. Personnel entry is not required for routine operation. Guided - The guidance system usually references a laser beam projected onto a target in the MTBM, capable of installing gravity sewers or other types of pipelines to the required tolerance, for line and grade. Pipe jacked - The process of constructing a pipeline by consecutively pushing pipes and MTBM through the ground using a jacking system for thrust. Continuously supported – Continuous pressure is provided to the face of the excavation to balance groundwater and earth pressures. Microtunneling is typically employed to accurately install pipelines from 18 inches to 96 inches in diameter. It is the best pipe jacking method for wet and unstable ground conditions or ground conditions that may contain contaminated soils. Nada Pacific has microtunneled over 140,000 linear feet since forming in 1992. Please contact us for a complete list of projects. A few of our recent notable projects are summarized as follows: Project Owner Completed Total Footage Pipe Size (in) Pipe Longest Drive Challenges Alvarado Blvd Trunk Sewer Project Phase I Union City, CA Union Sanitary District May-04 7220 39 Polycrete 820 Microtunnel under busy city street w/o disruption. Export Pipeline Castro Valley/Lewelling Segment Castro Valley & San Leandro, CA Livermore Amador Valley Water Mgmt Agency Feb-04 7570 650 36 55 RCCP Permalok 980 Long drives down busy city streets Fair Oaks/So. Orangevale Sewer Sacramento, CA Sacramento County Mar-06 2550 27 Polycrete 570 Microtunnel under busy city streets w/o disruption Tight tolerances Alvarado Blvd Trunk Sewer Project Phase II Union City, CA Union Sanitary District Jun-05 5274 1252 384 256 24 36 21 36 Polycrete Polycrete Polycrete Permalok 760 Extremely wet soil, areas of boiling sand Crossings under RR, I880 and river levees Tight tolerances Very tight schedule Redwood Trunk Sewer Oxnard, CA City of Oxnard Nov-06 3450 36 Polycrete 1000 Long drives w/ tight line & grade tolerances Whether the project calls for non-disruptive crossing under existing utilities, busy highways, railroads, levees, waterways and sensitive wetlands or shaft-to-shaft pipeline installation, Nada Pacific Corporation has the experience and expertise to achieve successful results.