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<br /> <br /> <br /> <br />2550 University Ave. West, Suite 400N |St. Paul, MN 55105 <br /> Main 651.644.4389 + Fax 651.644.9446 <br /> <br />HRGREEN.COM <br /> <br /> <br /> <br /> <br />April 1, 2019 <br /> <br />Sue Polka <br />1245 Hwy 96 W <br />Arden Hills, MN <br />55126 <br /> <br />Subject: Arden Hills Utility Monitoring & Control – Design Phase <br /> <br />Dear Sue: <br /> <br />We are pleased to present this proposal to continue to assist Arden Hills with the design of your utility <br />monitoring and control system improvements. The goal of the previously completed study phase was <br />to provide Arden Hills with recommendations for a single monitoring system, for both water and <br />wastewater, possessing technology for both current replacement and future expansion. Our study <br />phase recommendations are summarized in a memo submitted to Arden Hills on March 7, 2019. This <br />proposal covers the design work required to allow Arden Hills to contract with a contractor / supplier to <br />install the recommended upgrades. <br /> <br />PROJECT UNDERSTANDING <br /> <br />Potable Water System <br /> <br />To establish reliable communication between the Booster Station and the North Tower, a system using <br />standard radio telemetry equipment will be designed. This will provide updates to the Booster Station <br />in less than one second. However, their antennas will need to be elevated, preferable to the top of <br />each tower. The Satellite photos indicate there are no antennas at the top of the South Tower but there <br />appears to be something on the top of the North Tower. Assuming that there are no conflicts on either <br />tower, the existing hand-railing could be used to simply mount the radio antennas. <br /> <br />The existing Booster Pump Station at the South Tower has an outdated PLC that is no longer <br />supported by Allen Bradley. This PLC and its associated I/O and PanelView will be replaced as part of <br />the SCADA system upgrades. The main reason is that a newer PLC would be complete with Ethernet <br />communications that is the current standard with no need to upgrade to a different protocol in the near <br />future (10-20yrs.). Now this entire system would be modernized and ready for future add- <br />ons/improvements, not necessarily part of this project. By upgrading to Allen Bradley’s new PLC and <br />PanelView, the labor investment is minimized by transferring the same program into the new PLC as <br />well as the PanelView. The only labor intensive part is installing the new PLC and I/O onsite, which <br />may require new wiring to reach the new footprint of the PLC and I/O. To provide a common system <br />monitoring platform for the water system and lift stations, an OmniSite unit will be added at the booster <br />station. <br /> <br />Lift Stations <br />Arden Hills will furnish and install all of the lift station modem cards. HR Green will not be involved in <br />that process. <br /> <br />