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• • <br /> From: Jane Zimmerman [mailto:JZimmerman@everettwa.gov] <br /> Sent: Tuesday, June 30, 2015 10:54 AM <br /> To: Eric Peterson <br /> Cc: Kimberly McNabb; Dave Voigt; Kirk Brooks <br /> Subject: RE: WSU design review meeting <br /> Hi Eric— <br /> Yes, it seems reasonable to assume that the area is impervious for the reasons you state below. However,the discharge <br /> location for the runoff from the new parking lot might be an issue with respect to flow capacity. I don't know how the <br /> runoff from the rooftops was previously handled, but the College has experienced flooding in the past by changing the <br /> discharge point for their runoff, even when they didn't change the amount of impervious area. In fact,the 1998 line at <br /> the south end of your area of interest was constructed to keep stormwater separate from the combined sewer for as far <br /> downstream as possible for just that reason... <br /> I think the City would much prefer that you discharge to the storm drain at the south end of the area, rather than the <br /> sewer main at the north end of the area. However,the 1998 line may or may not have been sized to handle the runoff <br /> from the previous buildings. I'm pretty sure the City will have the design report for that storm drainage system <br /> microfilmed somewhere, but I don't have the time to search for it myself. However, if you ask at the building counter at <br /> 3200 Cedar St,they could show you where such files are located so you could search for yourself under the college's <br /> address of 2000 Tower St. I took a quick look through the microfilmed plans that I have access to at my desk and it looks <br /> like the work was done in association with the EvCC Instructional Technology Center, which came through for City <br /> review in 1997. <br /> I'm also copying Dave Voigt on this email—he's the City's expert on the combined sanitary-storm sewer system and all <br /> its issues. I'm also copying Kirk Brooks—IF I remember correctly, Kirk was the City's Development Technician for that <br /> project. <br /> Thank you, <br /> Jane <br /> Jane Zimmerman, Sr. Engineer <br /> City of Everett Public Works Department <br /> phone: 425-257-8885 fax: 425-257-8882 <br /> e-mail:/zimmerman(c.everettwa.gov <br /> / 2� <br />