Shortcut Pipeline Improvement Project - Phase 3

6 Documents in Project


SCH Number
Lead Agency
Contra Costa Water District
Document Title
Shortcut Pipeline Improvement Project - Phase 3
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Document Description
This supplemental MND describes proposed changes in the construction methods that are needed for Phase 3 repairs to the SCPL. Approximately 2,000 feet of twin 36-inch High-Density Polyethylene pipeline (HDPE) pipelines will be installed under Walnut Creek between the Marathon Refinery and Conco using horizontal directional drilling (HDD) construction methods. The twin 36-inch pipelines will be 60 to 80 feet below the ground surface to ensure that the new pipelines are in a layer of subsurface soil conditions that are more stable in the event of a seismic event.

Contact Information

Mark Seedall
Agency Name
Contra Costa Water District
Job Title
Principal Planner
Contact Types
Lead/Public Agency


Contra Costa
Cross Streets
Imhoff Drive and Waterbird Way
State Highways
Hwy 680 and Hwy 4
Buchanan Field
Las Juntas Elementary
Walnut and Pacheco Creeks

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Department of Transportation, Division of Aeronautics (DOT), California Department of Transportation, Division of Transportation Planning (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), Delta Protection Commission, Delta Stewardship Council, Department of Toxic Substances Control, Office of Historic Preservation, San Francisco Bay Conservation and Development Commission (BCDC), State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance
Development Types
Water Facilities (Pipeline Repair)(Type Twin 36" HDPE, MGD 21.5)
Local Actions
Use Permit
Project Issues
Air Quality, Biological Resources, Cultural Resources, Geology/Soils, Greenhouse Gas Emissions, Hydrology/Water Quality, Wetland/Riparian
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form

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