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PUBLIC WORKS <br /> o Refer to related comments above regarding use of current City standards to <br /> determine and document the long-term design infiltration rate for sizing <br /> proposed infiltration facilities. <br /> o List the applicable design standards that were the basis for design of the <br /> proposed infiltration facility. <br /> o Document the proposed design and how it meets the applicable design <br /> requirements, including but not limited to horizontal and vertical setback <br /> requirements, control structure design, geometry(e.g., berm width and <br /> sideslopes,pond geometry, etc.). <br /> o Drawing C-09—Infiltration Basin Grading& SWPPP provides the following <br /> note: "Pond grading to be coordinated with mining reclamation <br /> grading". The final grading, including but not limited to bottom elevation, <br /> side slopes, and berm dimensions,must meet the applicable design <br /> requirements for infiltration ponds per the SWMM, and the infiltration <br /> feasibility assessment and design recommendations must be based on <br /> representative grading assumptions that reflect the final design and installed <br /> condition. <br /> • MR#6—Runoff Treatment <br /> a. Document the following: <br /> o Type(s) of runoff treatment required(e.g., basic, enhanced,phosphorus, oil <br /> control, other based on applicable basin plans, etc.). See related comment <br /> above on Section 8.5 of the SSP. <br /> o The amount of pollution generating hard surfaces (PGHS) and other surfaces <br /> tributary to each proposed BMP. <br /> o The design flow rate for each proposed BMP, including discussion of <br /> methods and results. <br /> o The treatment capacity of each proposed treatment unit(e.g., filter cartridge). <br /> o The number of treatment units required for each BMP based on the design <br /> flow rates and treatment capacities. <br /> b. Provide WWHM model output reports for sizing of each individual treatment BMP. <br /> • MR#7—Flow Control <br /> o Refer to comments for MR#5. <br /> • MR#9—Operation and Maintenance <br /> o Provide an Operation and Maintenance (O&M)plan per Section 2.5.9, Vol. I <br /> of the SWMM, outlining the party (or parties)responsible for maintenance <br /> and operation. Specify that a copy of the O&M plan shall be retained on-site <br /> 'f/Page 7 of 9,;' <br /> l ,a' <br />