1605 SE EVERETT MALL WAY BOBS BURGER AND BREW 2025-07-25

Bob's Burger and Brew ' City of Everett,WA Stormwater Site Plan December 21,2009 Preliminary Conditions Szzmmaty ' The site in its existingcondition is servingas additional parkingfor the TopFood ' and Drug (Haggens) located directly to the west of the site. The site is approximately 1.26 acres and is currently covered in a mixture of landscaped areas and parking surfaces. The following table summarizes the existing pervious and impervious areas. Table 1: Existing Site Conditions Entire Site 27300 26900 54200 50% ' There is currently one catch basin onsite that collects runoff from the site and connects to an additional upstream pipe. This is a 12" pipe that conveys runoff from the Top Food's truck well. The site survey has been included in Appendix A to show the existing conditions, and contributory area. An asbuilt drawing of the existing drainage facility has been included in Appendix ' A to show the location of the existing flow control structure and discharge location of the Top Food's drainage facility. The existing onsite catch basin connects to an existing 54" detention pipe that is part of the Top Food's drainage system. The proposed drainage facility will release ' water to the existing detention system at its current release rate for the 10-year, 24- hour and 100-year, 24-hour and 50% of the 2-year, 24-hour event. PACLAND assumes that the outfall of the existing Top Food's has no negative downstream impacts, therefore by creating less runoff or matching the current release rate, the proposed system will have no downstream impacts. Off-Site Analysis ' An offsite analysis has been completed as part of this project to observe the existing drainage system a quarter mile away from the site. The site discharges into the existing Top Food's drainage facility which is a system of interconnected detention ' pipes. The pipes all discharge to a common flow control structure located approximately 700 feet to the southwest of the site. Stormwater, is then conveyed to the west and is conveyed via storm drain pipes to the soutl7in the Everett Mall Way right of way. Based on our site visit on December 10, 2009, it ppears the underground conveyance system then routes stormwater to the e on West Mall Drive. During our site visit we did not notice any problems within a quarter mile ' from the project site. PACLAND does not foresee any additional downstream impacts to this system since we are proposing to release stormwater to the existing ' system at less than or equal to the current release rate. PACLAND Project#30182002 Page 3