Portable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project

Portable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project

MNWD is proposing replacement of existing potable water and recycled water pipelines that run underneath the I-5 freeway using trenchless microtunneling installation methods. The PW and RW pipelines transport water to and from existing pump stations located on each side of the freeway. MNWD would install the new PW and RW pipelines between the Caltrans bridge piers and below the potential scour depth of Oso Creek utilizing trenchless microtunneling installation methods. The new PW pipeline that crosses from west of I-5 to east of I-5 would be an approx 900 lf, 21-in diameter pipeline and the new RW pipeline that crosses from west of I-5 to east of I-5 would be an approx 600 lf, 30-in diameter pipeline. The portions of the 21-in and 30 in pipelines that cross under I-5 would be encased in a 72-in diameter steel casing. On the east side of I-5, the PW pipeline would continue as a split to the north and to the south from the receiving shaft for the 21-in PW pipeline. A 12-in PW pipe would run to the north to connect to an existing PW pipeline using open-cut trenching, and another 12-in PW pipe would run to the south underneath Oso Creek to an additional microtunneling entry shaft. This pipeline would continue further to the south and back to the west to connect to an existing PW pipeline using open cut trenching. The RW pipeline would connect to the existing 8-in and 10-in RW pipelines located slightly to the north of the receiving pit using open cut trenching. On the west side of I-5, the PW and RW pipelines would connect to the existing water lines from the launching shaft through extensions with open cut trenching. All pipelines would be steel.

Mission Viejo

Orange

California Department of Parks and Recreation, California Department of Transportation, Division of Transportation Planning (DOT), California Highway Patrol, California Native American Heritage Commission (NAHC), California Regional Water Quality Control Board, Santa Ana Region 8 (RWQCB), California State Lands Commission (SLC), Department of Water Resources, Office of Historic Preservation, Resources Agency, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Drinking Water, District 8, California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Transportation, District 12 (DOT)

California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Transportation, District 12 (DOT)

Water Facilities (Type pipelines)

water fac

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Sewer Capacity, Solid Waste, Transportation, Vegetation, Wetland/Riparian, Wildfire, GHG