Best Practice Action Detail

Best Practice Action 20.4

GreenStep City Best Practices Environmental Management
Efficient Water and Wastewater Systems No. 20

Assess and improve city drinking water and wastewater systems and related facilities.

Best Practice Action 4

Optimize energy and chemicals use at drinking water / wastewater facilities and decrease chloride in wastewater discharges.

1 star Inform residents about the ecologic benefits to reducing water softener salt use; shift operation times of large pumps or activities so as to secure a cheaper electrical rate; purchase cheaper 'interruptable rate' electricity; install a peaking generator for load shaving/cost savings as well as backup power. Report ductile drinking water pipe under BP 15.8
2 star Report savings from reduced fluoride levels; evaluate pump efficiency, repair or upgrade to efficient ones and report on anticipated cost savings.
3 star Implement other/longer payback period drinking water facility upgrades such as measurable reduction in chemical use, use of backwash water; soften drinking water and work to eliminate home water softeners.

Who's doing it

Apple Valley - 3 star
Date action report first entered:
Date of last report update:
Implementation details:
The city has completed an energy audit and backwash optimization improvements.
Outcome measures/metrics:
Descriptive File:
For more information contact:
Charless Grawe (City staff) | CGrawe@ci.apple-valley.mn.us | 952-953-2508
Partners:
Inver Grove Heights - 3 star
Date action report first entered:
Date of last report update:
Implementation details:
The City of Inver Grove Heights utilizes Xcel Energy's peak control program for the booster station and three of the city's wells. When Xcel experiences a high energy demand, the City can power the wells with our generators to receive a reduced energy rate.

To increase pumping efficiency, the City upgraded the water treatment plant's lift station with the financial assistance through an Xcel rebate. Operating pumps at the booster stations and well house have received annual variable frequency drive upgrades over the last 15 - 20 years.

In 2015, the Department of Health reduced the required concentration of fluoride in drink water. The City of Inver Grove Heights responded by reducing the concentration of fluoride added at the water treatment facility from 1ppm to 0.7ppm, which reduced the City's expenses on water treatment chemicals.

Outcome measures/metrics:
Descriptive File:
For more information contact:
Ally Hillstrom (City staff) | ahillstrom@invergroveheights.org | 651-604-8511
Partners:
Isanti - 3 star
Date action report first entered:
Date of last report update:
Implementation details:
The City has upgraded their force main wastewater pumps to dual air release / air vac for better performance and efficiency.
The City utilized the allowed 10% of recycles backwash water in the water treatment plant operations.
By using the clarifiers in the wastewater treatment plant, the City has lowered the amount of Aluminum Sulfate by approximated 1/3.
The City has lowered the amount of hydrofluorosilicic acid used to fluoridate the city’s drinking water in response to the new fluoride level rule.
Outcome measures/metrics:
Descriptive File: view file
For more information contact:
Sheila Sellman (City staff) | ssellman@cityofisanti.us | 763-444-5512
Partners:
Marshall - 3 star
Date action report first entered:
Date of last report update:
Implementation details:
2019: The Minnesota Public Facilities Authority (PFA) announced $12 million in loan and grant funding for water infrastructure projects in Atkin, Dassel, Gibbon, Marshall. “These projects will increase access to clean water and protect the environment,” said Governor Tim Walz. “This represents a great investment in the health and wellbeing of our local communities.” “Water infrastructure continues to be a vital resource for Minnesota communities,” said DEED Commissioner Steve Grove. “These projects represent an investment in the future health and economic growth of Greater Minnesota.”
Outcome measures/metrics:
2019: Marshall, $7,000,000
This project consists of improvements to the drinking water treatment plant that will reduce discharge of chlorides to the environment. Funding for this project comes from a Point Source Implementation grant of $7 million. In addition $4,585,492 will come from local sources.
Descriptive File:
For more information contact:
Mark Antony (City staff) | MarkA@marshallutilities.com | (507) 537-7005
Partners: City of Marshall, Marshall Municipal Utilities, Minnesota Public Facilities Authority
Richfield - 3 star
Date action report first entered:
Date of last report update:
Implementation details:
We have back-up generators and are already part of the Xcel Energy’s peak shaving program. We recycle all water used for backwashing and from the filter presses. This water gets pumped back to the head of the plant for re-treatment.
Outcome measures/metrics:
Descriptive File:
For more information contact:
Russ Lupkes (City staff) | rlupkes@richfieldmn.gov | 6128619175
Partners:
Sherburn - 3 star
Date action report first entered:
Date of last report update:
Implementation details:
In late 2016, the City started construction on water treatment facility that contains a reverse osmosis membrane treatment. This allows for softer water coming out of the plant and for citizens to reduce their water softner or remove all together. We have seen a reduction in the amount of chloride in our wastewater system.
Outcome measures/metrics:
Descriptive File:
For more information contact:
Kym Christiansen (City staff) | kym.christiansen@cityofsherburn.com | 507-764-4491
Partners:
Burnsville - 2 star
Date action report first entered:
Date of last report update:
Implementation details:
-The City of Burnsville pumps the majority of it's water at night, securing a cheaper electrical rate.
-The City has many natural gas pumps and motors, versus electric.
-Installed a peaking generator for load/shaving and cost savings in the 1990s.

The City evaluates pump efficiency in it's 10 Year Cycle Rehabilitation Plan. If a pump needs to be replaced, the city applies for rebates that usually make the most energy efficient pumps that most cost efficient.
Outcome measures/metrics:
Descriptive File:
For more information contact:
Sue Bast (City staff) | basts@ci.burnsville.mn.us | 952-895-4524
Partners:
Coon Rapids - 2 star
Date action report first entered:
Date of last report update:
Implementation details:
In 2016, the City reduced its Fluoride feed rate from .9-1.5 parts per million (PPM) to .5-.9 PPM to the City drinking water. The City saw an annual savings of roughly $10,000.00 in its first year.
Outcome measures/metrics:
Descriptive File:
For more information contact:
Kory Jorgensen (City staff) | KJorgensen@coonrapidsmn.gov | 763-767-6576
Partners:
Golden Valley - 2 star
Date action report first entered:
Date of last report update:
Implementation details:
A third party electrical company inspects the City’s water and wastewater pumps on a yearly basis to ensure all pumps are working to their maximum efficiencies. The City has installed a peak shaving generator in its pump house and has replaced two out of the four water reservoir pumps with newer, more efficient models. There are plans to replace the remaining two pumps by 2020.
Outcome measures/metrics:
The average daily flow for the three cities that make up the Joint Water Commission (Golden Valley, New Hope, and Crystal) is 4.75 MGD. Between June of 2016 and June of 2017, the average daily electric usage for the Golden Valley reservoir was 2,043 kWh per day.
Descriptive File:
For more information contact:
Joe Hansen (City staff) | jhansen@goldenvalleymn.gov | 763-593-8038
Partners:
Rogers - 2 star
Date action report first entered:
Date of last report update:
Implementation details:
In the summer of 2011, the Ciy hosted a MnTAP intern who researched process optimization options at the City's WasteWater Treatment plant. Following the recommendations of the study, the city has replaced its sludge pnd aerators with NEMA super premium efficient motors. In March 2012, the City began implementing the second round of recommendations, which includes installing dissolved oxygen sensors and VFD drives on rotors to optimize dissolved oxygen processes. This project has been budgeted and is expected to be completed by June 2012.

The attached MnTAP Intern report lists process optimization options and associated payback periods.
Outcome measures/metrics:
Descriptive File: view file
For more information contact:
Mike Bauer (City staff) | mbauer@ci.rogers.mn.us | 763-428-0974
Partners: MnTAP, MN GreenCorps
Bloomington - 1 star
Date action report first entered:
Date of last report update:
Implementation details:
The WTP lighting was upgraded from high bay metal halide to LED high bay fixtures in the fall of 2015.

The metal halide lighting was never turned off due to the nature of the type of light. If the lights were powered off and we turned them on, it would take 5 minutes for the lights to become fully lit. Meaning we never shut these lights off due to how long the light took to power back on. This was a huge energy hog and most of the time no one was in the room. By changing over to the LED, not only were the lights lower in wattage, they were brighter, and we were able to turn the lights on with instant lighting. The lighting in these rooms today are normally off and have a motion sensor to turn back on when needed.
Outcome measures/metrics:
Descriptive File:
For more information contact:
Steve Gurney (City staff) | sgurney@BloomingtonMN.gov | 952-563-4606
Partners:
Gilbert - 1 star
Date action report first entered:
Date of last report update:
Implementation details:
The improved wastewater plant has many implementations to provide longer payback for drinking water and other water uses. The new plant will get Gilbert below the dreaded mercury limit, as well as remove excess phosphorus from the water. Aerobic digestion will be used to alleviate and reduce waste. The new facility will remove many unnecessary chemicals that would eventually inadvertently end up in Lake Superior.
Outcome measures/metrics:
The hopes for the future are that Gilbert will meet the soon to be enforced mercury limit. Many people in Gilbert do not understand why there is a mercury limit, much less why they need to comply to it. This new facility will take the burden off their hands. The technology does the work for the people of Gilbert. Phosphorus and mercury do not belong in the St.Louis river, nor in Lake Superior.
Descriptive File: view file
For more information contact:
Sam Lautigar (City staff) | samlautigar@gilbertmn.org | 218-748-2214
Partners:
Northfield - 1 star
Date action report first entered:
Date of last report update:
Implementation details:
Installed generators for peak savings for drinking water and wastewater. 2000 (WW), 2002 (Well 3 & 4)

All well pumps are rebuilt every 8 years. Not based on efficiency, just on use.

Outcome measures/metrics:
Descriptive File:
For more information contact:
Beth Kallestad (City staff) | beth.kallestad@ci.northfield.mn.us | 507-645-3074
Partners:
Pierz - 1 star
Date action report first entered:
Date of last report update:
Implementation details:
We partner with Rich Prairie Sewer and Water for our City Sewer and Water. They test and monitor water and chemicals regularly to make sure that they are providing clean and healthy drinking water. They also have a generator in case of power failure that allows them to continue to operate.
Outcome measures/metrics:
Descriptive File:
For more information contact:
Kari Tyson (City staff) | karit@pierzmn.org | 320-468-6471
Partners: Rich Prairie Sewer and Water District
Saint Cloud - 1 star
Date action report first entered:
Date of last report update:
Implementation details:
Energy and chemical efficiency evaluations are completed daily at both the drinking water and wastewater treatment facility. These evaluations are used to make changes to the treatment process to be as cost-effective and energy efficient as possible.
Outcome measures/metrics:
Descriptive File:
For more information contact:
Tracy Hodel (City staff) | tracy.hodel@ci.stcloud.mn.us | 3202557226
Partners:
Eagan - Pending
Date action report first entered:
Date of last report update:
Implementation details:
Evaluate chemical usage by inflow(daily) and also on a yearly peak demand ratio. We also take yearly sludge samples and have them analyzed for pollutants and report this to the pollution control agency.
Outcome measures/metrics:
Descriptive File:
For more information contact:
Jon Eaton (City staff) | jeaton@cityofeagan.com | 651/675-5212
Partners:
Fergus Falls - Pending
Date action report first entered:
Date of last report update:
Implementation details:
The City of Fergus Falls is conducting a study on the water plant and will likely be bringing forth a recommendation for a new plant.
Outcome measures/metrics:
Descriptive File:
For more information contact:
Len Taylor (City staff) | len.taylor@ci.fergus-falls.mn.us | 218-332-5418
Partners: