Mills Lane Storm Drain Improvement Project


SCH Number
Lead Agency
City of St. Helena
Document Title
Mills Lane Storm Drain Improvement Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Service Commercial (SC), Industrial (I), Agriculture (A-20), Winery (W) / Industrial, Urban Reserve, Agriculture
Document Description
The proposed Project consists of a new storm drain that will convey this runoff, as well as drainage from runoff east of Highway 29, and can service future development in the area, discharging to the Napa River. The proposed Project entails construction of a new storm drain within Mills Lane, which is a City street for most of its length, from its intersection with State Highway 29 east to the Napa River. The proposed storm drain system connects to an existing 30” storm drain pipe at a new drop inlet structure. The new storm drain will consist of 45 feet of 36” pipe, 894 feet of 48” pipe, and 3,867 feet of 60” pipe. All proposed storm drain pipe will either be reinforced concrete pipe (RCP) or HDPE. The total length of the proposed storm drain is approximately 4,900 feet. The storm drain will discharge to the west bank of the Napa river approximately 600 feet east of the terminus of Mills Lane. Some road repaving will be necessary; however, no above-ground structures are proposed.

Contact Information

Aaron Hecock
Agency Name
City of St. Helena
Contact Types
Lead/Public Agency


St. Helena
Cross Streets
Hwy 29 and Mills Lane
Parcel #
009-070-029, 009-120-060
State Highways
Hwy 29
Wine Train
Napa River

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 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), California State Lands Commission (SLC), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality, California Department of Transportation, District 4 (DOT)
State Reviewing Agency Comments
California Department of Transportation, District 4 (DOT)
Development Types
Other (New storm drain project.)
Local Actions
Capital Improvement Project
Project Issues
Air Quality, Biological Resources, Cultural Resources, Mandatory Findings of Significance, Tribal Cultural Resources


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 or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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