2611 ROCKEFELLER AVE ROCKEFELLER SQUARE 2 2024-08-12

BMPs C151, C152, C153, and C154 will be used to control pollutants. All pollutants, including waste materials and demolition debris, that occur onsite shall ' be handled and disposed of in a manner that does not cause contamination of stormwater. Good housekeeping and preventative measures will be taken to ensure that the site will be kept clean, well-organized, and free of debris. ' Element#10—Control Dewatering There will be no dewatering expected as part of this proposal. If it occurs, Baker tanks will ' be used for dewatering. Element#11 —Maintain BMPs ' BMPs C 150, C 160, and C 162 shall be used to manage the project. All temporary and permanent erosion and sediment control BMPs shall be maintained and repaired as needed to assure continued performance of their intended function. ' Maintenance and repair shall be conducted in accordance with each particular BMP's specifications. Visual monitoring of the BMPs will be conducted at least once every calendar week and within 24 hours of any rainfall event that causes a discharge from the ' site. If the site becomes inactive, and is temporarily stabilized,the inspection frequency will be reduced to once every month. All temporary erosion and sediment control BMPs shall be removed within 30 days after the final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped sediment shall be removed or stabilized on site. Disturbed soil resulting from removal of BMPs or vegetation shall be permanently stabilized. ' Element#12—Manage the Project BMPs C150, C160, and C 1 62 shall be used to manage the project. Erosion and sediment control BMPs for this project have been designed based on the following principles:Design ' the project to fit the existing topography, soils, and drainage patterns; Emphasize erosion control rather than sediment control; Minimize the extent and duration of the area exposed; Keep runoff velocities low; Retain sediment on site; Thoroughly monitor site and maintain all ESC measures and Schedule major earthwork during the dry season. The SWPPP shall be modified as necessary to include additional or modified BMPs designed to correct problems identified. Revisions to the SWPPP shall be completed within seven (7) days ' following the inspection. ' Element#13—Protect On-site Stormwater Management BMPs for Runoff from Roofs and Other Hard Surfaces ' BMPs C233 will be used. On-site stormwater management BMPs used for runoff from roofs and other hard surfaces include full dispersion, roof downspout full infiltration or dispersion systems, perforated stubout t connections, rain gardens, bioretention systems, permeable pavement, sheetflow dispersion, and concentrated flow dispersion. The areas on the site ' Insight Engineering Co. -Stormwater Site Plan 12/30/20 - 17-