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PA - 2000045 Project - 3 - 4 August 2022 San Joaquin County http : //www . waterboards . ca . gov/water issues / programs / stormwater/constpermits . 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 ) / post - 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/ centralvalley/water issues /storm water/ municipal p ermits / 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 /stormwater/ phase 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 Perm its/ index . shtmI 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 ( USACE ) . 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 for small municipalities , including non - traditional Small MS4s , which include military bases , public campuses , prisons and hospitals .