From: Ryan Hepler
Sent: Mon Apr 17 16:38:00 2017
To: 'Gerald Fisher'
Subject: Filter #3 #4 effluent manifold
Importance: Normal
Attachments: 20170321_131846_1490127576899_resized.jpg; 20170417_155809_resized.jpg; Gerald, Please see attached photos and description of the effluent manifold on filter #3 and #4. This manifold is severely corroded and is in need of repair before it begins to leak. The material is too thin to weld on so the pipe will need to be replaced and because of the configuration of the pipe it would be difficult to even put on a temporary repair band. This effluent pipe is critical to the operation of filter #3 and #4. Filtered water is pumped via (2) centrifugal pumps and past (2) wafer check valves. Over the years the steel pipe has corrodes at the chlorine point of injection. If the manifold develops a leak we will be forced to isolate those filters and this will keep us from meeting the summer water demand. We are required to inject sodium hypochlorite for disinfection and Soda Ash for corrosion control. These two chemicals get injected into the manifold before the water travels into the finished water reservoirs. The new pipe will be built of stainless steel and we will add (2) injection quills that will inject the Sodium Hypochlorite and Soda Ash into the center of the pipe instead of the edge of the pipe. This will keep this problem from happening again. Ryan Hepler City of Molalla Water Treatment Operator 503-829-5408