San Miguel Wastewater Treatment Plant Upgrade / Expansion Project Initial Study / Mitigated Negative Declaration

2 Documents in Project


SCH Number
Lead Agency
San Miguel Community Services District
Document Title
San Miguel Wastewater Treatment Plant Upgrade / Expansion Project Initial Study / Mitigated Negative Declaration
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Per the County of San Luis Obispo’s Zoning Code, the property is zoned Public Facility (PF)/Agriculture (AG). The northerly property, which the District has purchased in conjunction with the WWTF upgrade is zoned Agriculture (AG)/Residential Suburban (RS).
Document Description
The San Miguel Community Services District (District) owns and operates the Machado Wastewater Treatment Facility (WWTF), located in the community of San Miguel, County of San Luis Obispo, California. The WWTF occupies approximately 38.4 acres comprising four separate parcels, including Assessor’s Parcel Numbers (APNs) 021-051-013, -015, -016 and -017. The main plant occupies approximately 17.8 acres, while the remaining 20.6 acres are located within the channel of the Salinas River to the east of the plant and mapped as Federal Emergency Management Agency (FEMA) Special Flood Hazard Zone A. The WWTF underwent the most recent significant upgrades in the 1990’s and these were completed in 2001 bringing its current and permitted capacity up to 200,000 gallons per day (0.2 million gallons per day). The District currently treats an average of approximately 170,000 gallons per day. As noted in the Final Environmental Impact Report, San Miguel is expected to grow to a population of 3,658 in the year 2035 (County of San Luis Obispo 2016a). The District acknowledges that the existing WWTF is nearing capacity and has therefore proposed the WWTF expansion and upgrade (proposed project) to meet population projections and to comply with regulatory requirements. Physical improvements that would occur as part of the proposed project include improvements to the collection system/reclaimed water system, pumping station, septic receiving station, office and laboratory facilities, and additional maintenance and equipment storage/shop facilities; upgrading and modernizing the electrical controls and supervisory control and data acquisition (SCADA) system; and upgrading the backup power generation facilities. With the exception of a new treatment processing pad and all-weather access road and associated grading as well as solar panels, all project components would be located within the main WWTF. The new treatment processing pad and grading would be located to the north of the main WWTF on land owned by the District that is routinely maintained and cleared.

Contact Information

Kelly Dodds
Agency Name
San Miguel Community Services District
Job Title
Director of Utilities
Contact Types
Lead/Public Agency / Project Applicant

Heather Freed
Agency Name
Water Systems Consulting
Job Title
Associate Engineer
Contact Types
Consulting Firm


San Miguel
San Luis Obispo
Cross Streets
Benedict Street
Total Acres
Parcel #
021-051-013; 021-051-015; 021-051-016; 021-051-017
Union Pacific Railroad
San Miguel Joint Union School, Almond Acres Charter Academy
Salinas River
Other Information
Continued schools within 2 miles: Lillian Larsen Elementary School

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, Central Region 4 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 5 (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 Regional Water Quality Control Board, Central Coast Region 3 (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, State Water Resources Control Board, Divison of Financial Assistance
State Reviewing Agency Comments
State Water Resources Control Board, Divison of Financial Assistance
Development Types
Waste Treatment:Sewer (Upgrade of the San Miguel Machado Wastewater Treatment Facility)(MGD 0.47)
Local Actions
Redevelopment, Wastewater Treatment Facility Upgrade
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Energy, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Wildfire
Local Review Period Start
Local Review Period End


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

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