3530 COLBY AVE 2016-05-19 - Laserfiche WebLink

Kirk Brooks From: Jane Zimmerman Sent: Thursday, April 23, 2015 8:14 AM To: Kirk Brooks Subject: 3530 Colby Ave Parking - project review Hi Kirk— Please see below for my plan/report review comments for the subject project and please feel free to forward/give these comments directly to the applicant. BTW—I have not addressed the means/method of connecting the new stormwater detention system to the sanitary sewer line, other than to note the requirement for an upstream gas trap. Thank you, Jane Jane Zimmerman, Sr. Engineer City of Everett Public Works Department phone: 425-257-8885 fax: 425-257-8882 e-mail:jzimmerman(c�everettwa.gov Project Review for 3530 Colby Avenue Parking Drainage Memo: Approved Plans: Sheet 1 The location of section A needs to be shown on the plan view. Sheet 2 It isn't clear where the existing inlet, located just to the south of the proposed restrictor catch basin, currently drains to. However, if feasible, this inlet should be rerouted to connect to the restrictor manhole. No modification to the proposed detention system would be required for this reroute. However, if it isn't feasible to reroute the outlet from the existing inlet to the restrictor catch basin, the plans must show where the existing inlet discharges to before the proposed new inlet to the south can be connected to the existing inlet. The outlet pipe from the restrictor manhole is currently shown with a "bend" in it. City standards require a catch basin at alignment changes in storm drains. However, City standards also require the installation of a gas trap upstream of the combined system connection that would not be satisfied with an open top restrictor. Therefore, I recommend that a catch basin be installed at the currently shown bend location and the outlet pipe from the new cb equipped with a floatable material/gas trap per City standard #410. 1 \Iv