From: Gerald Fisher
Sent: Tue Jun 12 09:55:48 2018
To: Andy Peters
Cc: Dan Huff
Subject: RE: Conversation this morning on Meters
Importance: Normal
Hi Andy,
First things first. Tetra Tech shows the vault and meter installed on the asbuilts, correct? If so then contact Tetra Tech and ask them to respond to the issue of their asbuilts showing the vault and mag meter but one not being able to be found in the field. They may have an errors and omission issue on their hands with this, not to mention a problem with DEQ, if they certified that everything on their asbuilts was done and in fact wasn’t done.
Try contacting Gordon Munro, Sr Civil Project Manager. Let him know that the vault and meter is shown on the plans but you can’t find it in the field. Ask him to check internally with their staff to see if anyone remembers what happened back in the day and get back to us ASAP. They may be scurrying around to figure out why they may have errored or will have an answer as to where it was relocated to during construction. Do not plan on installing meters anywhere at this point. Thanks.
Regards,
Gerald Fisher, P.E. | Public Works Director
City of Molalla
117 N Molalla Ave. | PO Box 248 |Molalla, OR 97038
Office: 503.829.6855 | Direct: 503.759.0218
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From: Andy Peters [mailto:apeters@cityofmolalla.com]
Sent: Friday, June 08, 2018 12:11 PM
To: Dan Huff <dhuff@cityofmolalla.com>; Gerald Fisher <gfisher@cityofmolalla.com>
Subject: Conversation this morning on Meters
Gents, I’ve spoken with Mike Pinney about our flow situation being unable to accurately measure Irrigation Plant flows. We worked this out on the phone and he asked for an email documenting our approach. This is what I’d intended to send him. Feel free to edit?
Andy
Mike, just following up on our Conversation this morning:
It appears the effluent mag-meter and vault that was suppose to be constructed during the 2007 project (shown on the Tetra-tech as-builts) was not installed, or else can’t be found. The city of Molalla can estimate flows for the irrigation season from the DAF meters as you know, which we think represents a total of +30% based on knowledge of process. On July 1st the City can begin installing 2 new Transit-time Meters (SonicPro S2, cut sheet attached), one on each of the effluent pump’s pipes in the effluent pump house (pipe locations planned by the supplier, attached). The readings of these two meters can be summed together in SCADA, and serve as the Plant’s effluent flow going up the hill instead of the missing Mag Meter. I’ve spoken with Gerald about all this, and he’s indicated the City could budget for the construction of the vault per the original 2007 plan in FY19/20. But as you pointed out, it may be best to wait for that until the best location and flow metering scheme can be decided upon by the engineers designing our new plant?
Here is some information on the Attachments and some supporting facts for documentation:
1) our AS-BUILT drawings from Engineering file 07-07, Tetra Tech / KCM project no 3530029 are attached.
a. Sheet 9 of 83 shows “Flow Meter #6 MH” which was supposed to have been installed in a vault 23’ off the face of the new building.
b. Sheet 12 of 83 details the vault and specifies a “Multi Point Insertion Mag Meter”.
c. Sheet 66 of 83 details the electrical for it.
d. Sheet 17 of 83 details the installation of the mag meter itself.
e. There is indeed a wall mounted receiver for a flow meter in the Effluent Pump House where this Mag Meter’s readout was suppose to be located per sheet 66. This physical box is labeled FIT-200 and titled “CCB Influent Flow Meter”. It was clearly installed in 1999 as part of the construction of the building, and is shown on those as-builts. The Scada programs going back in time have registers allocated to this FIT-200, but those registers have never been assigned to any input or output on any PLC that we can find. In short, I’m confident the Mag Meter and Vault that was supposed to be installed in 2007 were never installed.
2) A photo of Molalla City Crews searching for the Vault with an excavator. None was found, no images of such a vault are extent in an of the construction photos available, and Google Earth historical satellite images do not show a vault.
3) Cut sheet for SonciPro Transit Meters, which we propose installing until the vault and mag meter can be constructed.
Andy Peters
City of Molalla
Public Works Operations Supervisor
(503) 829-6855 x220
Cell: 503-793-0507
117 N Molalla Ave
Molalla, OR 97038