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

Panera Bread Stormwater Management Report Everett,WA SECTION 3 - Stormwater Site Plan I. Project Description The scope of work being performed under this project is the demolition of the existing oil/lube business, self-serve carwash and the affiliated pavement and utilities. Once demolition is complete, a new 4,300 square foot Panera Bread restaurant with drive-thru will be constructed along with a newly configured parking area and site utilities. Although the project site is part of an overall plaza, the only work being performed will be the proposed restaurant and it immediate surrounding area. For the purposed for this assessment,the area considered shall be within the limits of disturbance and any stormwater runoff that will influence the stormwater conveyance system being constructed. II. Site Assessment The existing site is mostly impervious surfaces with a small amount (0.05 acres) of pervious area. In performing and analysis of the threshold discharge area, it has been observed that the site currently drains to a series of catch basins; which are routed to a single discharge location by way of underground sewer and a small section of open channel (ditch) along 3rd Avenue SE. The connection point to the City collection system is a single manhole with a vertical riser located at the southwest corner of the property. The proposed project shall continue to utilize the existing single discharge location. The project site is located on the northeast corner of a plaza that consists of a McDonald's restaurant to the east and an in-line retail center along the east and south sides of the plaza. After performing a site visit, reviewing topographic survey and studying the as-built drawings of the adjacent McDonald's; it has been determined that 0.26 acres of runoff from the McDonald's parking area currently sheet flows onto the project site. This area will continue to contribute to the project site and has been accounted for in the stormwater system design. See Figure 3 in Appendix A. No Critical Areas were identified on the project site or influencing the project site. III. Site Development Plan w/On-Site Stormwater Management BMPs The following items from the site assessment were used to determine appropriate On-Site Stormwater Management BMPs: • There is 0.26 acres of area to the east (McDonald's parking lot)that currently drain onto the project site. There is no on-site drainage leaving the site. • Proposed slopes throughout the site range from 1%to 6%, which is similar to the existing conditions. • There is no existing mature vegetation on the project site. Core States Group Page 11