909 SE EVERETT MALL WAY IIZUNA CIDER 2019-09-05

, Tony Lee 16 Building Official I Permit Services 425.257.8812 13200 Cedar Street, 2nd Floor, Everett,WA 98201 EVERETT Hours: Monday—Friday 7:30am-12:OOpm and 1:OOpm-4:OOpm everettwa.gov I Facebook I Twitter Note:Emails and attachments sent to and from the City of Everett are public records and may be subject to disclosure pursuant to the Public Records Act. From:Chris Rensch<chris.r@renschengineering.com> Sent:Wednesday,June 26, 2019 6:01 PM To:Adam Clark<AdamP2812architecture.com> Cc:Adam Lyons<adam.IPrenschengineering.com> Subject: RE: lizuna Cider Adam, I reviewed these plans and have the following comments: 1. The front door and garage door areas meet the 4%requirement for natural ventilation. 2. IBC 1203.5.2 still requires exhaust of contamination sources by mechanical means. 3. The question becomes is CO2 expelled during the fermentation process a contaminant? Not sure since the code does not define a contaminant. 4. On other projects that store CO2 tanks on site,we call for a detector and alarm system to ensure occupants are aware of any leaks from the system (typically smaller spaces). 5. At a minimum, I recommend a detection system (multiple detectors) and audible alarm to ensure personal know when the CO2 has become high and open the doors. 6. Threads I have read online indicate some cideries and breweries have had problems with high CO2 and other off gases causing poor indoor air quality. 7. I can't find anything in code explicitly requiring an exhaust system for the CO2 but the code would ultimately default to ASHRAE for good indoor air quality and the ownership's responsibility to protect the people in the building. 8. I can't say for sure whether an exhaust system is required by code. And I cannot say I would not require an exhaust system without knowing more about their process and how much CO2 gas they expect to produce. I don't think I can give the city a good answer until I get more information on the CO2 production and then look at the concentration levels. Air circulation of some form would be good to ensure there are no concentrated/stagnant pockets. It may be simpler to just install an exhaust fan on one side and put a louver on the other and time it to move air through the space. This along with a detector/alarm system would work well but would also impact their heating system. Let me know how you would like to proceed. Thanks, Chris Rensch, P.E., LEED AP BD+C Principal 360-863-6677 Rensch Engineering, LLC ENGINEERING MICHANI AL AND ILICTRICAL BUILDING DEMON 1_