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PA-2000152 Project -3- 28 July 2022 San Joaquin County http://www.waterboards.ca.gov/water issue s/progra m s/stormwater/co nstpe rm its.sht ml Phase I and II Municipal Separate Storm Sewer System(MS4)Permits' The Phase I and II MS4 permits require the Permittees reduce pollutants and runoff Flows from new development and redevelopment using Best Management Practices (BMPs)to the maximum extent practicable (MEP). MS4 Permittees have their own development standards,also known as Low Impact Development(LID)lpost- construction standards that include a hydromodification component. The MS4 permits also require specific design concepts for LID/post-construction BMPs in the early stages of a project during the entitlement and CEQA process and the development plan review process. For more information on which Phase I MS4 Permit this project applies to,visit the Central Valley Water Board website at: http://www.waterboards.ca.gov/centralvalleVtwater issues/storm water/municipal p e rm its/ For more information on the Phase II MS4 permit and who it applies to,visit the State Water Resources Control Board at: http://www.waterboards.ca.gov/water issues/programs/stormwaterlphase ii munici pal.shtml Industrial Storm Water General Permit Storm water discharges associated with industrial sites must comply with the regulations contained in the Industrial Storm Water General Permit Order No.2014- 0057-DWQ. For more information on the Industrial Storm Water General Permit, visit the Central Valley Water Board website at: http://www.waterboards.ca.gov/centralvalley/water issues/storm water/industrial ge neral permits/i ndex.shtml Clean Water Act Section 404 Permit If the project will involve the discharge of dredged or fill material in navigable waters or wetlands,a permit pursuant to Section 404 of the Clean Water Act may be needed from the United States Army Corps of Engineers(USAGE). If a Section 404 permit is required by the USACE,the Central Valley Water Board will review the permit application to ensure that discharge will not violate water quality standards. If the project requires surface water drainage realignment,the applicant is advised to contact the Department of Fish and Game for information on Streambed Alteration Permit requirements. If you have any questions regarding the Clean Water Act Section 404 permits, please contact the Regulatory Division of the Sacramento District of USACE at(916)557-5250. Municipal Permits=The Phase I Municipal Separate Storm Water System (MS4) Permit covers medium sized Municipalities(serving between 100,000 and 250,000 people)and large sized municipalities(serving over 250,000 people). The Phase II MS4 provides coverage forsmall municipalities,including non-traditional Small MS4s, which include military bases, public campuses, prisons and hospitals. PA-2000152 (ZR) Informational Letters 15