12815 19TH AVE SE 2018-01-02 MF Import

Paul McKee From: Jane Zimmerman Sent: Sunday, March 29, 2015 12:16 PM To: Paul McKee Cc: Teresa Weldon; Gerry Ervine; Terr; Jorgenson; Heidi Davis; Benyam Stephanos Subject: RE: Silver Lake Elem. Portables Hi Paul — I researched our permit history for this site and I also researched the stormwater system downstream of this site in the adjacent subdivision. I'll save all y'all the long detailed explanation of why, and just answer your question... Yes, the project will require a stormwater management plan, and it does appear that the stormwater plan and report will need to show compliance with Minimum Requirements 81-9. The conditions to be used as the "existing" conditions for comparison with the "proposed" conditions are required to be the land use conditions that existed in February of 1997. Absent of any better information, I would recommend the applicant use the City's 2001 aerial photography to determine the conditions that existed in 1997. When I look at the City's 1996 aerial and the 2001 aerial, there does not appear to be any appreciable difference in the area I would consider impervious. However, the 2001 aerial has much a much higher resolution and the impervious area will be easier to measure. Thank you, Jane Jane Zimmerman, Sr Engineer City of Everett Public Works Department phone:425-257-8885 fax 425-257-8882 e-mail: izimmerman(d)everettwa.gov From: Paul McKee Sent: Wednesday, March 25, 2015 5:30 PM To: Jane Zimmerman Cc: Teresa Weldon; Gerry Ervine; Terri Jorgenson; Heidi Davis; Benyam Stephanos Subject: Silver Lake Elem. Portables Hi Jane, We received permit application(s) for a grouping of 7 new portables (six classrooms & one bathroom) for Silver Lake Elementary located at 12815 19" Ave SE. The portable structures alone, not inclusive of any walkway paving, total up to more than 5800 Sq. Ft. of impervious area. They intend to place them on the grass playground east of the main school buildings. It appears that we permitted two portables to be placed there in August of last year. And, it also appears from TRAKiT and GO! Sync that there is a history of portables moving on and off of the playground over the last decade. The submittal came in without a stormwater management plan ... Will we need to require oi.0 And if so, should they be addressing min requirements 1-9 or? The full plan set is available at the permit counter if you need to see more context. Thanks,