From: Jennifer Cline
Sent: Fri Aug 22 16:10:42 2014
To: Jonathan Patrick
Cc: Garrett Edmunds; Dan Huff
Subject: RE: Molalla Lagoon leak testing.
Importance: Normal
Hi Jon –
Garrett and I took a look at the valve and it appears the shaft may just be disconnected from the seat.
When leaving I noticed pipes on the west side of the pond entering from the dike. Garrett said these are by-pass pipes to the small lagoon. Can we open those up to reduce the flow into and elevations in the Large lagoon? This should allow the water elevation to drop below the structure inlet to make the valve repair. May not work, just a thought.
JC
From: Jonathan Patrick [mailto:jpatrick@cityofmolalla.com]
Sent: Friday, August 22, 2014 1:16 PM
To: COLE David
Cc: Dan Huff; Christine Hein; Jennifer Cline
Subject: RE: Molalla Lagoon leak testing.
We were going to follow the Oregon Department of Environmental Quality guidelines for estimating leakage from existing sewage lagoons. We will isolate a lagoon and then the calculation will be influent + precipitation –evaporation – effluent = seepage. I will give you more detail later. We have to repair a valve that doesn’t close all the way before we can accurately do the test. Since it is recommended to do this test in the summer, we might have to do the test next May. It takes about 15 days to do the test. That will give me time to get a report back to you by the June deadline. I would like to do it this October. Unfortunately by the time parts arrive and repairs are made to the valve we may be into the rainy season. Let me know if you have any further questions.
Jon Patrick
503 793 5283
From: COLE David [mailto:COLE.David@deq.state.or.us]
Sent: Thursday, August 21, 2014 1:55 PM
To: 'Jonathan Patrick'
Cc: COLE David
Subject: Molalla Lagoon leak testing.
Hi Jon. Have you prepared a lagoon leak test project plan? If so, I’d like to see it. If not, what are your plans to do this, and what is the timeline to complete it?
David Cole, R.G.
Water Quality Permit Compliance Specialist
DEQ Northwest Region & Western Region
2020 SW 4th Avenue
Portland, OR 97201
(503) 229-5011
(503) 229-6957 Fax
From: YELTON-BRAM Tiffany
Sent: Thursday, August 21, 2014 1:49 PM
To: COLE David
Subject: Lagoon testing
Hi David
As you know, Molalla has a permit condition to leak test the lagoons within one year of permit issuance. Could you please check in with them to ask what their project plan will be? They may need assistance and if that is the case, let me know, please. We don’t require the project plan but I’d like to have us see it. Your call will also serve as a good reminder if they haven’t yet thought about this!
Tiffany Yelton Bram
Water Quality Source Control Section Manager
Water Quality Program, NW Region
Oregon Department of Environmental Quality
2020 SW 4th Ave., Suite 150
Portland OR 97201-4987
desk 503 229 5219
mobile 503 975 0046