304 SE EVERETT MALL WAY PANERA BREAD 2025-07-25

Panera Bread Stormwater Management Report Everett,WA roof runoff does not require treatment prior to site discharge. See Appendix B for calculations, details and product specifications. N. BMPs and Facilities The existing single discharge location is equipped with a functioning oil/water separator (riser). This manhole will continue to function as the site's single discharge location and treatment device will remain intact. In addition to the oil/water separator,the site's proposed pervious areas have been increased from 0.05 acres to 0.17 acres,thus improving the existing conditions. 0. Conveyance Analysis For the purpose of designing conveyance systems in the City of Everett, the method depends upon the size of the basin. For sites in the City of Everett that disturb less than one acre of land and with a developed time of concentration less than or equal to 60 minutes, the Rational Method must be used to determine design flows.The Rational Method analysis was performed utilizing the 25-year storm event in accordance with the City of Everett Stormwater Management Manual. The calculations are provided as Figure 5 Appendix A of this report. P. Maintenance and Operation Plan The property owner shall plan to complete a checklist(See Appendix C)for catch basins,the oil/water separator and the BayFilterTM unit on the following schedule: (M) Monthly from October through April. (A) Once in late summer(preferably September). (S)After any major storm (use 1 inch in 24 hours as a guideline). Photocopies of the pages provided in Appendix D shall be used and checked off for the problems looked for each time an inspection is completed.Comments on problems found and actions taken shall be noted.Some items do not need to be looked at every time an inspection is done.The suggested frequency at the left of each item shall be used as a guideline for inspections. The "checked" sheets shall be kept by the property owner and made available to the City upon request. The facility-specific maintenance standards contained in Appendix D are intended to be conditions for determining if maintenance actions are required as identified through inspection.They are not intended to be measures of the facility's required condition at all times between inspections. In other words, exceedance of these conditions at any time between inspections and/or maintenance does not automatically constitute a violation of these standards. However, based upon inspection observations,the inspection and maintenance schedules shall be adjusted to minimize the length of time that a facility is in a condition that requires a maintenance action. Core States Group Page 20