Agmt01 County of San Mateo NPDES

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4. Provision C. 2: The Regional Boards has found that there is a reasonable potential that municipal stormwater discharges may be causing or contributing to an excursion above water quality standards for: a) copper, nickel, mercury, dioxin -like compounds, DDT, dieldrin, chlordane, and PCBs into Lower and South San Francisco Bay; b) sediment in Pescadero Creek, San Francisquito Creek, and San Gregorio Creek basins; and c) diazinon in San Francisquito Creek, San Mateo Creek, and Lower and South San Francisco Bay (Finding 12). Therefore the dischargers are legally required to submit a report that describes BMPs that are currently being implemented and additional BMPs that will be implemented to prevent or reduce the above listed pollutants that may be causing or contributing to the exceedance of WQSs (see provision C.2 for specific requirements for reporting). This provision is a narrative water quality -based effluent limitation that will ensure that the discharges do not cause or contribute to impairment of these water bodies. 5. Provision C.3 and CA: These provisions require the implementation of the... Dischargers' Plan and Performance Standards and essentially incorporate the Plan, including the Performance Standards, into the permit, thus making its implementation enforceable. It also establishes, in conjunction with Provision C.1, the Plan and Performance Standards as the focal points of the permit. As such, the Plan, including the Performance Standards, is considered a living document that will change and improve with time. Specifically, all other plans required by the permit are expected tc be incorporated into the Plan. 6. Provision C.5 through C.7: These provisions require submittal of Annual and Mid - Fiscal Year Reports. The information required in the Annual and Mid -Fiscal Year Reports is equivalent to that required in storm water regulations pursuant to 40 CFR 122.41(1) and the Basin Plan. The elements of the Annual and Mid -Fiscal Year Reports will ensure that programs and performance standards are developed and implemented and will allow evaluation of compliance with permit conditions. The Annual Report also provides a focus to review, update, or revise the Plan on an annual basis. Provision C.5 establishes a process for submittal of two-year Work Plans by the Dischargers that detail specific tasks and actions to be implemented on a fiscal year basis. 7. Provision C.8: This provision requires the annual submittal and implementation of a Monitoring Program Plan in accordance with 40 CFR Parts 122.44(n and 122.48 which demonstrates the effectiveness of the Plan and accordingly, demonstrates compliance with the conditions of the permit. Rather than requiring specific types, locations, and frequencies of monitoring activities, this provision establishes objectives for implementing the Monitoring Program Plan. This is intended to provide flexibility and efficiency in determining specific monitoring activities while establishing a basis for determining effectiveness of monitoring activities.