Reso PC16-05 0027 PC Reso 2075 Broadway

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49. C3 Requirements - Plans shall be designed to meet C3 requirements of the Municipal Regional Permit (MRP) NPDES Permit CAS 612008. [SDR][ENGINEERING] a. Treatment Controls —Treatment controls shall be designed and sized to treat run-off from the entire project (including all existing, new, and/or replaced impervious areas) using flow or volume based sizing criteria specified in Provision C.3.d of the Municipal Regional Stormwater Permit. i. Applicant shall coordinate installation of stormwater treatment measures with the municipality and shall arrange to have the City's designated inspector present at the time of installation. ii. Applicant shall arrange for final inspection of installed stormwater treatment measure by the City's designated inspector within 45 days of installation or project construction completion, whichever comes first. b. Tree Wells - High flow-rate tree well filter products and/or high flow-rate media filter products shall be certified by the Technical Assessment Protocol Ecology (TAPE) of the Washington State Department of Ecology as meeting the TAPE protocol General Use Level Designation for Basic Treatment. For TAPE program information and use level designation statements. c. Low Impact Design (LID) — LID treatment measures to be shown on final improvement or grading plans shall not differ materially from the LID treatment measures presented on the project's Downtown Planned Community permit, approved on , without written approval from the Planning Department. d. No Dumping — All drain inlets shall be clearly marked with the words "No Dumping! Flows to Bay," or equivalent using thermoplastic material or a plaque. e. Non-LID - Design of non-LID treatment measures shall be consistent with applicable technical guidance in Chapter 6 of the C.3 Technical Guidance. f. Use of Copper - Projects with architectural copper should, if possible, purchase copper materials that have been pre-patinated at the factory. Whether patination is done offsite or onsite, applicant should consider coating the copper materials with an impervious coating that prevents further corrosion and runoff. If patination is done on-site, implement one or more of the following: i. Discharge the rinse water to landscaping. Ensure that the rinse water does not flow to the street or storm drain. Block off storm drain inlet if needed. ii. Collect rinse water in a tank and pump to the sanitary sewer. Contact your local sanitary sewer agency before discharging to the sanitary sewer. iii. Collect the rinse water in a tank and haul off-site for proper disposal. ATTY/RES0.0027/PC RESO 2075 BROADWAY REV:04-18-16 VR Page 13 of 28