Byron Sand Mine Maria South Amendment


SCH Number
Lead Agency
Contra Costa County
Document Title
Byron Sand Mine Maria South Amendment
Document Type
MND - Mitigated Negative Declaration
Project Applicant
Contra Costa County
Present Land Use
Sand Mine

Document Description
The Project will modify the land use permit and reclamation plan for an existing sand mine. The existing permitted Byron Sand Mine operations encompass approximately 1,367 acres, with 966 acres owned by G3 Enterprises and 401 aces leased from adjacent landowners. The Byron Sand Mine Maria South Amendment (Project) would amend Land Use Permit #2078-91 and the Byron Mine Reclamation Plan to permit mine operations on the proposed Maria South quarry site. The proposed Maria South quarry would allow sand excavation on 15 acres of the project site adjacent to the existing, operational Evo-East quarry, thus expanding the approved Evo-East pit to the southeast, creating a single 50-acre contiguous quarry footprint. An additional 5 acres is proposed for storage of topsoil and overburden to be used for future reclamation activities. The project would also create a new 60-acres conservation easement. Mined sand would be quarried with scrapers or excavators/haul truck, transported to the existing feed hopper at the Evo-East pit where it will be combined with water and converted to slurry. The sand slurry would then be hydraulically transported to the Byron Sand Mine processing plant, and ultimately transported from the facility by truck to customers in the same manner as sand currently being mined. No modifications to the Evo-East hopper or slurry-transport facilities are needed, and there will be no increases in daily or annual truck traffic. Proposed mining operations for Maria South Amendment will be consistent with existing operations and would result in no increases in daily or annual mine throughput. Compared to the existing entitlements, the primary change would be a 20-acre increase in disturbed area and an approximately six-year extension in the Byron Sand Mine's current operational life. Whereas the existing land use permit specifies an expiration date of 2026 for mining operations at the Byron Sand Mine, the County no longer imposes expiration date on land use permits. Land use entitlements run with the land until the use is discontinued. Based on the estimated volume of saleable material on the Maria South site, mining operations at the Byron Sand Mine would be extended by approximately six years with approval of the Proposed Project.

Contact Information
Gary Kupp
Contra Costa County
30 Muir Road
Martinez, CA 94553

Phone : (925) 674-7205


Contra Costa
Cross Streets
1300 Camino Diablo
Total Acres
Parcel #
1 S
15, NW
Other Location Info
1300 Camino Diablo, Byron, CA 94514

Notice of Completion

Review Period Start
Review Period End
Local Action
Other Action Land Use Permit and Reclamation Plan Amendment
Project Issues
Aesthetic/Visual Agricultural Land Air Quality Archaeologic-Historic Biological Resources Geologic/Seismic Noise Soil Erosion/Compaction/Grading Traffic/Circulation Tribal Cultural Resources Water Quality Water Supply Wetland/Riparian Land Use Cumulative Effects Other
Reviewing Agencies
California Air Resources Board California Department of Conservation California Department of Fish and Wildlife, Bay Delta Region 3 California Department of Forestry and Fire Protection California Department of Parks and Recreation California Department of Resources Recycling and Recovery California Department of Transportation, District 4 California Department of Transportation, Division of Aeronautics California Department of Water Resources California Governor's Office of Emergency Services California Highway Patrol California Native American Heritage Commission California Natural Resources Agency California Regional Water Quality Control Board, San Francisco Bay Region 2 California State Lands Commission Department of Toxic Substances Control Office of Historic Preservation State Water Resources Control Board, Division of Water Quality


Environmental Document
Maria South_NOI_Doc_ORC   PDF 54640 K
NOC_Maria South Signed   PDF 959 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 or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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