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RE: [EXTERNAL]Norton Ranch Lift Station - Proposed Site Configuration
From Lance Lehigh <llehigh@BOZEMAN.NET>
Date Fri 10/18/2024 2:49 PM
To Lee Hageman <lhageman@m-m.net>; Shawn Kohtz <SKohtz@BOZEMAN.NET>; Nick Pericich <NPericich@BOZEMAN.NET>; Cody Flammond <CFlammond@BOZEMAN.NET>
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Lee,
I was able to sit down with Shawn (Director of U li es) and Nick P (Water/Sewer Superintendent) to discuss your email. The following comments are in rela on to the
conceptual layout and provide general feedback as you con nue to move into dra design.
Design Feedback
1. Keep force main in City ROW as much as possible.
2. Limit amount of piping as much as possible, no ng there are constraints you are working around such as the electrical and gas mains, etc.
3. The City is ok with the wet well located on the east side of the property as present.
4. The City would like to limit the number of future manholes. The direc ve was to limit the amount of manholes vs placing mul ple manholes in the BLVD space. This
would require reconfigura on of the exis ng manholes in the Laurel Parkway, which may require regrading to achieve the desired flow results.
5. The City is ok u lizing the 30 foot easement to the south of the structure to maintain proper u lity spacing requirements and future access.
6. The proposed Revised Manifold – Isometric drawing – Is the intent to split the flow between the 6-inch and 8-inch force main. A second closed gate valve may be
necessary on the downstream side of the six-inch jockey pump feed for isola on. Based on our discussion it sounds like you an cipate using the 6 – inch main during low
flows and the 8-inch during peak periods.
I was also able to discuss the downstream evalua on and model results with Shawn and Nick.
Downstream Capacity analysis Director Determina on
1. The an cipated flow associated with the Norton Ranch Li sta on upgrades have adequate downstream capacity in the near-term to handle the expected Peak Flows at
the future e-in point on the 18-inch main within Co onwood Road
a. No downstream upgrades are required as part of these improvements.
Please let us know if you any ques ons.
Lance
City of Bozeman MT
Lance Lehigh, PE, CFM | Engineer III
From: Lee Hageman <lhageman@m-m.net>
Sent: Thursday, October 10, 2024 2:46 PM
To: Shawn Kohtz <SKohtz@BOZEMAN.NET>; Nick Pericich <NPericich@BOZEMAN.NET>; Lance Lehigh <llehigh@BOZEMAN.NET>; Cody Flammond
<CFlammond@BOZEMAN.NET>
Subject: [EXTERNAL]Norton Ranch Li Sta on - Proposed Site Configura on
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Shawn, Lance, and Nick,
Lance was kind enough to jump on a quick screen share with me yesterday to look at the lift station site and the proposed configuration. Based on our chat, I
prepared a conceptual layout to get additional feedback from everyone on this email so everyone is comfortable and I can move this conceptual plan forward into
draft design documents. The attached exhibit shows our proposed configuration of the site and piping with the new wet well.
A couple of notes on this site and configuration:
The proposed wet well location (east of the existing building) is the most constructable to avoid undermining the existing wet well, existing building, and a
proposed expansion of the existing building.
The site is constrained to the south between the building and the property line. There is not sufficient space to accommodate the gravity main to the new
wet well and the buried wet well underground piping while providing adequate separation distances from the existing property lines, the existing building,
and between the buried piping and gravity main.
An existing sewer easement on the property to the south can help resolve this issue (see image below and attached easement).
There is a manhole in Laurel Parkway and 8" stub that was previously installed to service that property that we could reconfigure to provide an
alignment for the new gravity main to the wet well.
We are proposing to abandon those plans in favor of rerouting the effluent from the inlet pipe to the existing wet well to the new wet well
location.
The proposed manholes would be installed outside of the existing banks of the stormwater pond to avoid inundation in the existing
conditions.
The existing pond shown is proposed to be abandoned when that lot is developed based on conceptual site plan we are working
on.
The site still gravity main service for the subdivision/lot.
Manholes in the boulevards could be made accessible with curb cuts and approaches (if needed).
The wet well will have a concrete access driveway, plus include a gravel access route to the south property line.
Proposed Manifolding
I've also drafted a proposed manifold configuration for the building that would prevent the issues with the flow meters. Here's a few images of the existing
configuration and the proposed configuration for reference.
EXISTING WET WELL - SECTION VIEW
Proposed Revised Manifold - Plan
Proposed Revised Manifold - Isometric
Please reach out with any questions or suggestions at your earliest convenience. I'm happy to jump on a quick call if that's easier.
I appreciate your feedback on this.
Thank you,
Lee Hageman, PESenior Engineer, Morrison-Maierle
+14069226734 direct | +14062091948 mobile
2880 Technology Blvd W, Bozeman, MT 59718
A 100% Employee-Owned Company