20161114111558354.pdf2707 Wetmore Avenue
Everett, WA 043MO I
t 425.387_3820
f 425_2550-195$
November 14, 2016
City of Edmonds
Via email: jennifer.lambert@edmondswa.gov
RE: Coleman SFR — Pump Tank Discharge Pipe Material
Dear Staff,
I was provided information from the contractor who installed the stormwater pump system in
regards to the pipe material used for the pump discharge line connecting to the detention
system on -site. The pipe material used was PVC Sch. 40 (300-psi). This was not one of the
approved materials provided by the City on the approved engineering plans. However, this
material is regularly used for water line installations with much higher pressure demands then
this system. The maximum pressure expected in the force line for this project is less than 60
psi which is nearly a quarter of the pressure specification for this product. Therefore, this
material will function as expected with no additional risk of failure or higher maintenance costs
or frequency.
Thank you for taking the time to review this project. Please feel free to contact me with any questions
you may have.
Sincerely,
Joseph Smeby, P.E.
Project Engineer # k
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