From: Jennifer Cline
Sent: Fri Jun 26 11:20:18 2015
To: Randy Bos
Cc: Jason Clifford
Subject: FW: Molalla pH monitoring data
Importance: Normal
Attachments: Instrument locations_70%design.pdf; Proposal Sensors PLC and SCADA, scope change rev 3.pdf; Hi Randy, Will you also please provide an updated map of the final installed locations? Looks like the one I have is of the proposed locations before we moved it to the Parshall flume. Thank you again, Jennifer Cline, P.E. City of Molalla Public Works Director O: 503.759.0218 F: 503.829.3676 From: COLE David [mailto:COLE.David@deq.state.or.us] Sent: Friday, June 26, 2015 11:00 AM To: 'Jennifer Cline' Cc: Jason Clifford; Christine Hein; PINNEY Mike; COLE David Subject: RE: Molalla pH monitoring data Hello Jennifer. Thank you for sending me the user manual for your pHix compact pH & Redox transmitter. Regarding the transmitter equipment itself, I have the following question and recommendation: · Which electrode(s) did you get (refer to the user manual, p. 7)? · Regarding maintenance/calibration, pay particular attention to the user manual maintenance section, p. 21. You may find that to get consistent, accurate results, you may have to calibrate more frequently than once a week, due to the low quality nature of the influent. Regarding the transmitter location, please send me a sketch map of where specifically at the headworks, you intend to mount it. I would prefer both plan and elevation views of the mounting location. Also, describe the mounting method (refer to user manual, pp. 10 – 12). Thank you. From: Jennifer Cline [mailto:jcline@cityofmolalla.com] Sent: Friday, June 26, 2015 10:32 AM To: COLE David Cc: Jason Clifford; Christine Hein; PINNEY Mike Subject: RE: Molalla pH monitoring data Hi David, This attached manual should provide all the information you are looking for. Pages 16-22 specifically address the Buffer adjustment, cleaning and maintenance. Jennifer Cline, P.E. City of Molalla Public Works Director O: 503.759.0218 F: 503.829.3676 From: COLE David [mailto:COLE.David@deq.state.or.us] Sent: Friday, June 26, 2015 9:10 AM To: 'Jennifer Cline' Cc: Jason Clifford; 'Christine Hein'; COLE David; PINNEY Mike Subject: RE: Molalla pH monitoring data Hello Jennifer. Thanks for the data table and comparison graph. Please give me a schematic and/or verbal description of exactly where and how you plan to install the pH meter at the headworks. What is the make and model of the instrument? Also, what are the manufacturer’s recommendations regarding calibration frequency when the meter is used for continuous measurements? Thank you. From: Jennifer Cline [mailto:jcline@cityofmolalla.com] Sent: Friday, June 26, 2015 8:59 AM To: COLE David Cc: Jason Clifford; 'Christine Hein' Subject: Molalla pH monitoring data Hi David, The City will be moving forward with the permanent installation of the pH probe at the Headworks for continuous monitoring. As you can see in the attached .pdf the pH meter values are tracking very close to the grab sample pH value. If you have any comment or questions before we move forward with the permanent installation, please let me know. Sincerely, Jennifer Cline, P.E. Public Works Director 117 N Molalla Ave. PO Box 248 * Molalla, OR 97038 O: 503.759.0218 F: 503.829.3676