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8. RUN-OFF TREATMENT (MR #6) <br /> As noted before this project proposes to install a total of 4,432 sf of effective new/replaced <br /> PGIS, combined on-site and within the City RAN. Therefore, this project does not exceed <br /> the 5,000 sf threshold and is exempt from this requirement. <br /> 9. FLOW CONTROL (MR #7) <br /> The site design for the on-site improvements is for approximately 2,310 sf of new <br /> impervious surfaces. The site design for the off-site improvements includes approximately <br /> 3,709 sf of replaced gravel surfaces with pavement(asphalt and concrete). <br /> Per the DOE and City stormwater manuals, since the on-site runoff will be fully infiltrated <br /> up to the 100-year storm event those surfaces can be considered non-effective impervious <br /> surfaces. As a result, the total effective impervious surfaces for this project is 3,709 sf. <br /> This is below the 5,000 sf threshold and as a result this project is exempt from flow <br /> control. <br /> 10. WETLAND PROTECTION (MR #8) <br /> By designing the on-site improvements to infiltrate the on-site runoff and keep the total <br /> effective impervious area to less than 5,000 sf this will provide the necessary protection to <br /> any downstream NGPA. <br /> • <br /> • <br /> Zillah Lot 2 SFR 18-0605 <br /> Aug.2019 Page 12 <br />