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_ . _ ...._ �'3 � <br /> AI <br /> �� ':: �� � � g � ��� �� . . <br /> ��� � : <br /> '_ .. ..: ' � : �. <br /> �`�����1��c�r���e�� ���d �� �o�n�ci�; <br /> . � <br /> : <br /> : ;,, ��� ` �� ����+�' <br /> July 26, 2004 <br /> Subject <br /> Ordinance Amendment - National Pollution Discharge Elimination System (NPDES) Permit <br /> and San Mateo Countywide Stormwater Management Plan for 2004-2009. <br /> Recommendation <br /> Introduce an Ordinance amending the Municipal Code to add Article 27A, adding Article II, <br /> Stormwater Treatment Measures and Maintenance Program, which would include the <br /> California Regional Water Quality Control Board General Order R2-2003-0023, amending <br /> the Countywide NPDES Municipal Stormwater Permit, including requirements for <br /> Operations and Maintenance Agreements. <br /> Background <br /> The Environmental Protection Agency, under amendments to the 1987 Clean Water Act, <br /> imposed regulations that mandate local government to control and reduce the amount of <br /> stormwater pollution runoff into receiving waters of the United States. Under the authority of <br /> the Porter-Cologne Water Quality Act, the State Water Resources Control Board has <br /> delegated authority to its regional boards to invoke permitting requirements. <br /> In July 1991, the San Francisco Bay Regional Water Quality Control Board (RWQCB) <br /> notified San Mateo County (and all its incorporated cities) of the requirement to submit a <br /> Municipal National Pollutant Discharge Elimination System (NPDES) Stormwater Permit <br /> application, and to implement a Stormwater Management Plan (Plan). Under the authority <br /> of C/CAG, all of the municipalities in San Mateo County submitted an NPDES Permit <br /> Application, including a Stormwater Management Plan, which met the San Francisco Bay <br /> RWQCB requirements. On September 15, 1993, the RWQCB adopted a Municipal <br /> Stormwater NPDES Permit (CAS 0029921) and Waste Discharge Requirements for all of <br /> the municipalities in San Mateo County, which remained in effect for five years. <br /> There have been three renewals and one amendment of NPDES Permit CAS 0029921 <br /> since the initial permit issuance in September 1993. In July 2003, the RWQCB reopened <br /> the existing Municipal Stormwater NPDES Permit CAS 0029921 and Wastewater Discharge <br /> Requirements for all municipalities in San Mateo County to include revised new <br /> development and erosion control language, by Special Order R2-2003-0023. Each <br /> Discharger shall include conditions of approval in permits for applicable projects, as defined <br /> in Provision C.3.c [Group 1 and Group 2 definitions], to ensure that stormwater pollutant <br /> discharges are reduced by incorporation of treatment measures and other appropriate <br /> source control and site design measures, and increases in runoff flows are managed in <br /> accordance with Provision C.3.f [hydrograph modification management plan], to the <br /> maximum extent practicable. <br /> Page 1 of 2 <br />