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

Summary

SCH Number
2018031044
Lead Agency
Moulton Niguel Water District
Document Title
Portable and Recycled Pipeline Replacements at Interstate 5 and Oso Creek Project
Document Type
MND - Mitigated Negative Declaration
Received
Present Land Use
Rec

Document Description
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.

Contact Information
David Larsen
Moulton Niguel Water District
26161 Gordon Road
Laguna Hills, CA 92653

Phone : (949) 425-3578

Location

Coordinates
33°34'27"N 117°40'20"W
Cities
Mission Viejo
Counties
Orange
Cross Streets
I-5 and Camino Capistrano
Zip
95945
Total Acres
7.27
Parcel #
numerous
State Highways
I-5/SR 73
Railways
LOSSAN
Schools
Numerous
Waterways
Oso Crk, La Paz Crk
Township
7S
Range
8W
Section
12

Notice of Completion

Review Period Start
Review Period End
Development Type
Water Facilities (pipelines Type)
Local Action
Other Action Other Action: water fac
Project Issues
Aesthetic/Visual Agricultural Land Air Quality Archaeologic-Historic Biological Resources Drainage/Absorption Flood Plain/Flooding Forest Land/Fire Hazard Geologic/Seismic Minerals Noise Population/Housing Balance Public Services Recreation/Parks Schools/Universities Sewer Capacity Soil Erosion/Compaction/Grading Solid Waste Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Water Supply Wetland/Riparian Growth Inducing Land Use Cumulative Effects Other Other Issues: GHG
Reviewing Agencies
California Department of Parks and Recreation California Highway Patrol Caltrans, Division of Transportation Planning Department of Water Resources Native American Heritage Commission Office of Historic Preservation Regional Water Quality Control Board, Region 8 Resources Agency State Lands Commission State Water Resources Control Board, Division of Drinking Water State Water Resources Control Board, Division of Drinking Water, District 8 Department of Fish and Wildlife, Region 5 Caltrans, District 12
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