Addendum to the Initial Study/Mitigated Negative Declaration for Soil Investigations for Data Collection in the Delta

11 Documents in Project


SCH Number
Lead Agency
California Department of Water Resources (DWR)
Document Title
Addendum to the Initial Study/Mitigated Negative Declaration for Soil Investigations for Data Collection in the Delta
Document Type
ADM - Addendum
Present Land Use
Land use zoning codes in the Study Area of the Proposed Project allow a variety of uses including agriculture, outdoor recreation, wildlife habitat, public facilities, and limited areas for commercial, industrial, and rural residential development.
Document Description
The planned work includes overwater and land-based soil borings, cone penetration tests, and geophysical surveys. The primary objective of the proposed project is to determine the composition, location, and geotechnical properties of soil materials commonly found in the Delta which would inform the design, environmental analysis, and development of alternatives for a potential Delta conveyance project and contribute to DWR's overall understanding of Delta geology. Based on current engineering considerations of alternative alignments for the proposed Delta Conveyance Project, the following additional geotechnical information is needed for preliminary design and to support environmental review. The proposed changes include the removal of 60 soil investigation sites identified in the 2020 Final IS/MND and the replacement with 60 new soil investigation sites in locations that are in and around the general study area of the Approved Project but were not specifically, previously evaluated in the 2020 Final IS/MND.

Contact Information

Katherine Marquez
Agency Name
CA Department of Water Resources
Contact Types
Lead/Public Agency


Alameda, Contra Costa, Sacramento, San Joaquin, Solano, Yolo
Northern California
Other Location Info
Alameda, Contra Costa, Solano, Sacramento, San Joaquin , and Yolo Counties

Notice of Completion

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 Fish and Wildlife, North Central Region 2 (CDFW), California Department of Parks and Recreation, California Department of Pesticide Regulation (DPR), California Department of Resources Recycling and Recovery, California Department of Toxic Substances Control (DTSC), 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 Regional Water Quality Control Board, Central Valley Redding Region 5 (RWQCB), California San Joaquin River Conservancy (SJRC), California State Lands Commission (SLC), Central Valley Flood Protection Board, Delta Protection Commission, Delta Stewardship Council, Office of Historic Preservation, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights
Development Types
Other (None)
Local Actions
Project Issues
Biological Resources, Cultural Resources, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Tribal Cultural Resources, Wildfire


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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