Duncan Hill Treated Water Improvements Project

2 Documents in Project


SCH Number
Lead Agency
Placer County Water Agency
Document Title
Duncan Hill Treated Water Improvements Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
The Project area is surrounded by rural residential development and open space. The proposed Project would be located largely within the public road right-of-way or the roadway shoulder, with one stream crossing, a crossing through Pacific Gas and Electric Company’s ROW, and a 560-foot section where the pipeline would be buried beneath non-native grassland. The Project area has a Placer County General Plan (General Plan) designation of rural residential (Placer County 2013) and a zoning designation of farm district and residential agricultural district (Placer County 2022).
Document Description
The proposed Project involves the installation of approximately 1.5 miles of treated pipeline within Millertown Road, Calnick Lane, Voyiatzes Road, Duncan Hill Road, and Ophir Road, and 560 feet of pipeline that would be installed beneath non-native grasslands. Installing the 12-inch ductile iron pipeline would involve open-cut trenching to place new pipe. The width of the impact footprint associated with installing the pipeline would be approximately 10 feet (5 feet on either side of the alignment) (1.93 acres). In addition to the pipeline alignment, the Project includes a proposed staging area (0.34 acres) for equipment and supplies. Additionally, two pressure-reducing stations would be installed along the proposed Project alignment for the system to operate properly. The total footprint for the Project occupies approximately 2.27 acres.

Contact Information

Heather trejo
Agency Name
Placer County Water Agency
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency


Cross Streets
Ophir Rd, Duncan Hill Rd, Voyiatzes Rd, Millertown Rd
Total Acres
Parcel #
038-290-008 (midpoint)
State Highways
Southern Pacific
Smart Start Auburn Preschool
North Ravine, Auburn Ravine
8 East
Mt. Diab

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 3 (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 State Lands Commission (SLC), Central Valley Flood Protection Board, Department of Toxic Substances Control, Office of Historic Preservation, Sierra Nevada Conservancy, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Drinking Water, District 9, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance, California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB)
State Reviewing Agency Comments
California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB)
Development Types
Other (treated water pipeline)
Local Actions
Site Plan
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Sewer Capacity, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form
State Comment Letters [Comments from state reviewing agencies]

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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