Erosion control in Chico is enforced through the State Construction General Permit (Order 2022-0057-DWQ) for projects disturbing 1+ acre, the city's Phase II MS4 program for smaller sites, and California Building Code Appendix J for grading. SWPPPs and rainy-season BMPs are required to prevent sediment-laden runoff from entering the MS4 and creeks.
Projects disturbing 1 acre or more must file electronic Permit Registration Documents (PRDs) via SMARTS, prepare a Stormwater Pollution Prevention Plan (SWPPP) signed by a QSD, and implement BMPs scaled to a project risk level (1, 2, or 3). Smaller sites still must implement minimum BMPs under the Phase II MS4 permit: perimeter silt fence/fiber rolls, inlet protection, stabilized construction entrance, soil stockpile covers, dust control, and concrete washout containment. The rainy season (October 1 – April 30) requires enhanced erosion-control measures and pre-storm inspections. CBC Appendix J §J109 mandates erosion control for any graded slope.
Discharging sediment into a creek or MS4 inlet is a Water Code §13385 violation with administrative civil liability up to $10,000/day plus $10/gallon. The city may issue stop-work orders and require BMP installation before work resumes.
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Chico, CA
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