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Joe Taflin <br /> From: Pat Carter <patc@hosbros.com> <br /> Sent: Thursday,June 30, 2022 6:34 PM <br /> To: Joe Taflin <br /> Cc: Matt Frause; Drew Williams <br /> Subject: RE: Soundview - Drainage Comment <br /> Joe, <br /> We plan on using vault#4 for storm water storage starting the 2"d week of August and vault#3/#5 the 2nd week of <br /> September. We will not install the flow restrictors in these vaults until the end of the project. In the interim condition <br /> the outfalls will be plugged and pumps on floats will be plumbed from the vaults to downstream outfall structures that <br /> flow to dispersion trenches. All stored storm water will be tested for turbidity and only released when levels are below <br /> <25 NTU with no chemical treatment or<10 NTU if chemical treatment is used. We are shooting for mid-October to <br /> have the base lift of asphalt down throughout the site and covering the native subgrade. Once the paving is installed and <br /> building slab is down Hos crews will clean the storm system, drain the vaults, clean them and activate the Bio-pods prior <br /> to removing the plugs and installing the restrictors. Please let me know if you have any additional questions. <br /> Thanks, <br /> Pat Carter <br /> Hos Bros Construction, Inc. <br /> 7733 W.Bostian Road,Woodinville,Wa 98072 <br /> C:(425)420-3468 0:(425)481-5569 F:(425)485-6634 <br /> From:Joe Taflin [mailto:joe@navixeng.com] <br /> Sent:Tuesday,June 28, 2022 10:48 PM <br /> To: Pat Carter<patc@hosbros.com> <br /> Cc: Matt Frause<mfrause@sierraind.com>; Drew Williams<dreww@hosbros.com> <br /> Subject:Soundview- Drainage Comment <br /> Pat, <br /> I'd like to get your help with one comment: <br /> It appears that the project's detention vaults will be used as temporary sediment storage during construction. Indicate <br /> how the vaults will be dewatered on the plans or CSWPPP. Will the MR 7 orifices be blocked off? <br /> A permit condition will be added to the Public Works Permit to indicate that the vaults shall be cleaned and inspected by <br /> the City prior to being brought into regular operation. <br /> Can you let me know how you plan to use the vaults for temp storage, how they'll be dewatered, and how the orifices <br /> will be protected?Thanks, <br /> Joe Taflin P.E.*, LEED AP <br /> Navix Engineering <br /> 11235 SE 6t" Street, Suite 150; Bellevue, WA 98004 <br /> d: 425.458.7900 1 c: 206.683.0108 <br /> loe(cDnavixeng.com I Iinkedin.com/JoeTaflin <br /> www.navixeng.com <br /> i <br />