From: Jennifer Cline

Sent: Mon Feb 09 08:02:21 2015

To: COLE David

Cc: 'Jonathan Patrick'; Erik Moorhouse; Jake Ehredt; Dan Huff; 'J.W. Ring'; 'Troy Collison'

Subject: Molalla - pH and Temp monitoring requirements.

Importance: Normal

Attachments: Instrument locations_70%design.pdf; pH-Temp_70%design.pdf; NPDES Permit-5-12-14.pdf;

Hi David,

Attached are 70% design plans for the following pH and river temp monitoring locations to meet the current NPDES Permit #101514, Schedule D, 11. Minimum Reporting Requirements, Table B13: Reporting Requirements and Due Dates for Table B1: Influent Monitoring (Row 4), Table B2: Effluent Monitoring (Row 6), Table B3: Ambient Monitoring (Row 2) on Pages 9-11 of 32.

1. pH sensor for Influent Monitoring (Row 4) located at the WWTP in the Headworks channel

2. Temp Sensor for Ambient Monitoring (Row 2) at the WTP Intake Pump Station adjacent to Molalla River

3. pH sensor for Effluent Monitoring (Row 6) located at the DMS adjacent to Molalla River

Please concur the above locations and systems to be installed are acceptable by DEQ to satisfy the requirements outlined in the NPDES Permit #101514.

Please let me know if you have any questions.

Sincerely,

Jennifer Cline, P.E.

City of Molalla

Public Works Director

O: 503.759.0218

F: 503.829.3676

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