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6.R. - Page 7 of 9 Water quality within the San Francisco Bay Region is regulated by the Regional Water Board. The San Francisco Bay Region encompasses portions of Alameda, Contra Costa, Marin, Napa, Santa Clara, San Francisco, San Mateo, Solano, and Sonoma Counties. One way that the Regional Water Board protects water bodies within the San Francisco Bay Region is to develop Total Maximum Daily Loads (TMDLs), which are programs to restore water quality in water bodies impaired by pollutants such as PCBs. Currently there is a TMDL established for PCBs in the Bay. To achieve the goals of the TMDL, a reduction in the amount of inputs of PCBs to the Bay is required. The PCBs TMDL estimates that 20 kilograms per year (kg/year) of PCBs enters the Bay in stormwater runoff, and requires that this input be reduced to 2 kg/year by 2030, a 90% reduction. In 2015, the Regional Water Board reissued the Municipal Regional Permit (MRP),3 a National Pollutant Discharge Elimination System (NPDES) permit that regulates discharges of stormwater runoff from MS4s. The MRP includes provisions that implement the requirements in the PCBs TMDL to reduce discharges of PCBs in stormwater runoff to the Bay. These include Provision C.121, which requires Permittees to develop new programs to manage PCBs -containing building materials during demolition. Remodeling, partial building, wood framed structure, and single-family residence demolition projects are exempt. The MRP requires that these new programs are adopted and begin implementation by July 1, 2019. ANALYSIS Redwood City is required by the MRP to reduce PCBs discharges in stormwater runoff. This regulation targets priority building materials that may contain relatively high levels of PCBs, especially in buildings constructed between 1950 and 1980. The priority building materials are caulking, thermal/fiberglass insulation, adhesive/mastic, and rubber window gaskets. It is recommended that these priority building materials be regulated during demolition to prevent the materials and associated PCBs from potentially being released to the environment and transported to the Bay by stormwater runoff. This regulation requires an assessment process for PCBs in building materials that is analogous in some ways to the process currently implemented for asbestos -containing materials. It requires that Redwood City initially notifies demolition permit applicants about the new requirements to conduct a PCBs in Priority Building Materials Screening Assessment. The PCBs in Priority Building Materials Screening Assessment is a two-step process used to determine whether 1) determining whether the building proposed for demolition is high priority for PCBs -containing building materials based on the building age, use, and construction type; and if so 2) demonstrating the presence or absence and concentration of PCBs in Priority Building Materials through existing information or representative sampling and chemical analysis of the Priority Building Materials in the building. The first step of the PCBs in Priority Building Materials Screening Assessment determines whether or not the 3 Order No. R2-2015-0049 Page 2 of 4 210