From: Jennifer Cline

Sent: Fri Jun 05 13:25:14 2015

To: Phillip Bender

Cc: Dan Huff; J.W. Ring; Mark Strandberg; Sarah Goodling

Subject: RE: Molalla: draft email to DEQ

Importance: Normal

I will send this out soon.

Jennifer Cline, P.E.

City of Molalla

Public Works Director

O: 503.759.0218

F: 503.829.3676

"file:///C:

From: Phillip Bender [mailto:PBender@ringbenderlaw.com]

Sent: Friday, June 05, 2015 12:43 PM

To: Jennifer Cline

Cc: Dan Huff; J.W. Ring; Mark Strandberg; Phillip Bender; Sarah Goodling

Subject: Molalla: draft email to DEQ

Jennifer,

Below is proposed language for an email from you to the DEQ engineer, Mike Pinney, in response to his questions about the Headworks data. Let me know any comments or questions and whether you think this answers his questions. As we just talked about, the source for this information is Industrial Systems' Troy Collison.

Mike,

Last Friday, you asked several questions about the influent flow measurement data. We have done some work to look into the available data with Industrial Systems, Inc., the City's SCADA system contractor. Specifically, you asked:

• * Can we deduce a time when the pumps failed to run based on when the inaccurate influent flow measurement readings began?
• * Is there a time stamp on record when this started to happen or a reasonable time we can assume the back up of influent flow started?

According to Industrial Systems, the influent flow data indicates that the influent parshal flume began experiencing an abnormal high level at approximately 3:00 PM on Saturday, May 9. This seems to indicate that, as of this time, the influent coming into the WWTP had backed up into the Headworks, where the influent parshal flume PLC is located, from the Aeration Basin. Had the transfer pumps in the Transfer Pump Station been running, this backup likely would not have occurred, although other issues can also cause these types of readings (e.g., material captured on the influent screen can also cause backups within the Headworks). Still, this data suggests that, at around 3:00 PM on May 9, the pumps were not running. (Industrial Systems could not determine from data for PLCs located in the Transfer Pump Station what time the pumps stopped.) Remember, though, that data from within the Headworks could indicate that the influent from the Aeration Basin had backed up into the Headworks, but it would not tell us the time that overtopping of the Aeration Basin began, or overtopping of the protective berms outside the Aeration Basin. It would have taken an additional volume of influent to overtop the Aeration Basin (it would first backup into the Headworks) and an additional, greater volume to then overtop the protective berms. Does this information from Industrial System answer your questions?

Please let me know anything further.

Jennifer