Vallecitos Channel Maintenance Project

Summary

SCH Number
2021030428
Lead Agency
Alameda County Water District (ACWD)
Document Title
Vallecitos Channel Maintenance Project
Document Type
MND - Mitigated Negative Declaration
Received
Present Land Use
The project involves an open channel that is surrounded by mixed grassland/rangeland for cattle grazing, undeveloped easements beneath utility powerlines, horse stable and training facility, and recreational paintball facility.

Document Description
The Vallecitos Channel is a critical component of ACWD's water supply system. The channel is an engineered, unlined, earthen trapezoidal channel that extends nearly 12,000 linear feet from the California Department of Water Resources (DWR) South Bay Aqueduct (SBA) turnout in the upper watershed to Vallecitos Creek near Vallecitos Lane in the lower watershed. The Project area extends from the head of the channel where the SBA emergency culvert outlet is located and extends downstream 7,980 feet. Under existing conditions, the channel requires maintenance. Several locations have experienced severe streambank erosion and bank sheering, thereby reducing the right-of-way width and rendering ACWD's maintenance road impassable. In addition, dense emergent vegetation obstructs flow in several portions of the channel, deflecting flow horizontally, exacerbating bank erosion and resulting in localized flooding. The Project will address bank erosion along Vallecitos Channel by implementing the following treatments: vegetation and sediment management, bioengineering treatments, partial bank rock slope protection (RSP), full bank RSP, and in-kind grouted RSP replacement at drop structures. The Project also includes upland drainage improvements and riparian/wetland habitat enhancement in portions of the channel. Project construction is anticipated to occur between July 2021 and October 2021 and require approximately 13 weeks for construction activities.

Contact Information
Kerri Smyth
Alameda County Water District
Lead/Public Agency / Project Applicant
43885 S Grimmber Blvd
Fremont, CA 94538

Phone : (510) 668-4486
kerri.smyth@acwd.com

Location

Counties
Alameda
Regions
Unincorporated
Parcel #
Various
Other Location Info
Vallecitos Channel near Vallecitos Lane in Alameda County

Notice of Completion

Review Period Start
Review Period End
Development Type
Water Facilities (MGD is not applicable)(Type channel maint., MGD 0.1)
Local Action
none
Project Issues
Air Quality Biological Resources Cultural Resources Geology/Soils Hazards & Hazardous Materials Hydrology/Water Quality Noise Recreation Transportation Tribal Cultural Resources Wildfire
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 Water Resources (DWR) California Highway Patrol (CHP) California Native American Heritage Commission (NAHC) California Natural Resources Agency Office of Historic Preservation State Water Resources Control Board, Division of Drinking Water State Water Resources Control Board, Division of Water Rights California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB)

Attachments

Draft Environmental Document [Draft IS, NOI_NOA_Public notices, OPR Summary Form, Appx,]
ACWD_Vallecitos_PublicMND_Appendices_Mar2021   PDF 36472 K ACWD_Vallecitos_PublicMND_Mar2021 v2   PDF 31412 K NOI_Vallecitos_MND   PDF 176 K Summary form for Electronic Document Submittal   PDF 1137 K
Notice of Completion [NOC] Transmittal form
Notice of Completion and Environmental Document Transmittal   PDF 1204 K
State Comment Letters [Comments from state reviewing agencies]
2021030428_RWQCB Comment   PDF 674 K

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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