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REDWOOD CITY 2 RAA Model and GI Targets Provisions C.11 and C.12 in the MRP require San Mateo Permittees (San Mateo County and its 20 cities and towns) to reduce estimated PCBs loading by 15 grams/year and estimated mercury loading by 6 grams/year using green infrastructure by June 30, 2020. Regionally, Permittees must also project the load reductions achieved via green infrastructure by 2020, 2030, and 2040, showing that collectively, reductions will amount to 3 kg/year of PCBs and 10 kg/year of mercury by 2040. This planning process developed and assessed projections for the square footage of impervious surface to be retrofitted and treated with green infrastructure from private projects within the Redwood City's jurisdiction by 2020, 2030, and 2040. It also incorporates targets for the square footage of impervious surface to be retrofitted and treated with green infrastructure through potential public projects within the Redwood City's jurisdiction by 2020, 2030, and 2040. 2.1 Reasonable Assurance Analysis and GI Implementation Goals The Municipal Regional Stormwater Permit (MRP) (Order No. R2-2015-0049) requires the development of GI Plans (Provision C.3) and PCBs and Mercury Control Measure Implementation Plans (Provisions C.11 and C.12) that provide the necessary pollutant load reductions to meet TMDL WI -As over specified compliance periods. A key component of these plans is a Reasonable Assurance Analysis (RAA) that quantitatively demonstrates that proposed control measures will result in sufficient load reductions of PCBs and mercury to meet WI -As for municipal stormwater discharges to the Bay. The City/County Association of Governments (C/CAG) of San Mateo County, via its San Mateo Countywide Water Pollution Prevention Program (SMCWPPP), led a county -wide effort to develop an RAA to estimate the baseline PCB and mercury loads tothe Bay, determine load reductions to meet WLAs among San Mateo County Permittees, and set goals for the amount of GI needed to meet the portion of PCB and mercury load reduction the MRP assigns to GI (SFBRWQCB 2015). Appendices C and D include documentation of the county- wide RAA, including: • Phase I Baseline Modeling Report — Provides documentation of the development, calibration, and validation of the baseline hydrology RWC GREEN INFRASTRUCTURE PLAN GREEN INFRASTRUCTURE PLAN 8 JUNE 2019 ATTY/RESO.0075/CC RESO APPROVING THE GREEN INFRASTRUCTURE PLAN — EXHIBIT A RESO. NO.15780 REV: 06-20-19 PR MUFF NO. 802