REV1 RESUB 2 - REVIEWED STM_Response letter 06-29-2021BLD2021 -001RECEIVED
Jul 02 2021
CITY OF EDMONDS
DEVELOPMENT SERVICES
10; DEPARTMENT
INSIGHT ENGINEERING CO.
July 2, 2021
Zack Richardson, PE Clarifications added by Z.Richardson 7/15/2021
City of Edmonds, Stormwater Engineer
Re: Kisan — BLD2020-0017
IECO No. 20-1062
Dear Zack,
The project referenced above is revised in response to the review comments dated June 15, 2021.
The review comments are numbered on the letter and have been addressed in italics as follows:
1. The city elects to continue its prohibition of CMP detention pipes;
please revise the tank material to acceptable alternative material and
revise all associated details and notes as needed.
Per email communication with Zack, the CMP pipe shall be used for
Clarification: City did not direct -use of CMP; City response simply indicated CMP would permitted if the design engineer
felt it was the most appropriate product. All responsability for selected materials remains with design engineer.
further attention. Upon updating buoyancy calculations for new tank
material, ensure the following are addressed:
a. Reviewer's experience is that buoyancy calculations typical
include a factor of safety which does not appear to be applied in
this case; consider addition of a factor of safety and/or provide
additional text in report addressing engineer's level of
confidence in this calculation as submitted.
Based on Buoyancy calculations and further discussions with
Clarification: Again, City did not direct or approve buoyancy calcs; we simply accept the professional opinion of the
design engineer as submitted. All responsibilities for adequate buoyancy protection remains with the design engineer.
dimension is provided on plans; however, if this dimension is
taken from the very end of the pipe, is appears to only measure
2.5'. Update design/or calculations as needed to ensure
adequate buoyancy control.
PO Box 1478 • Everett, WA 98206 • Phone: (425) 303-9363
Fax: (425) 303-9362 • Email:info@insightengineering.net
The pipe has been moved to the south to provide a minimum cover of 2.6'
Please refer to Sheet C3.1.
Please feel free to contact me with any questions or comments you may have.
Sincerely,
Brian. R. Kalab, P.E.
PO Box 1478 • Everett, WA 98206 • Phone: (425) 303-9363
Fax: (425) 303-9362 • Email:info@insightengineering.net