From: Andy Peters
Sent: Wed Nov 29 13:32:58 2017
To: Ryan Hepler
Cc: Gerald Fisher
Subject: RE: Intake screens
Importance: Normal
Ryan let’s take a look at this when I swing up there to show the fence contractor the job on Monday, and get a plan together. Thanks!
Andy Peters
City of Molalla
Public Works Operations Supervisor
(503) 829-6855 x220
Cell: 503-793-0507
117 N Molalla Ave
Molalla, OR 97038
From: Ryan Hepler [mailto:rhepler@cityofmolalla.com]
Sent: Wednesday, November 29, 2017 9:43 AM
To: Andy Peters <apeters@cityofmolalla.com>
Cc: 'Gerald Fisher' <gfisher@cityofmolalla.com>
Subject: Intake screens
Andy,
This morning I air purged the Intake screens and the lower screen (the one that had ruptured underground that we repaired) now seems to be plugged. I assume that dirt and gravel made its way down the 3” pipe sometime after it was broken. I remember this happening last time this air line broke and at that time we had to dig up and remove a coupling at the screen. The air line reduces from 3” schedule 80 plastic pipe to 2” galvanized pipe at the bottom of the intake screen. If I had to guess, this is where the blockage is happening. The good news is that the upper screen is still working so I am hoping that this will get us through the winter season. Each screen is rated at 4mgd each, however they are buried by river rock now so that is reduced. I am thinking we will have to contract out this repair but that is something we can talk about. I am assuming this repair will have to happen during the in-water work period this summer unless it becomes and emergency. There is a chance the blockage could clear on its own and I will let you know if that happens. Let me know what you think. I attached a picture of the screen for reference.
Ryan Hepler | Water Treatment Operator
City of Molalla
117 N Molalla Ave. | PO Box 248 |Molalla, OR 97038
Office: 503.829.5408 I Fax: 503.829.3676