HomeMy WebLinkAboutWater Supply Plan File No. 55155J
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A MINNESOTA STAR CITY.
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Water Supply Plan
Oak Park Heights, Minnesota
July, 1996
File No. 55125
Revised November, 1996
JA Bonestroo
MEIN Rosene
" Anderlik &
Associates
Engineers & Architects
St. Paul • Milwaukee
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' Water Supply Plan
For
■ Oak Park Heights, Minnesota
i November, 1996
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Barbara O'Neal
Dean Kern Sr.
Janet Robert
Dave Schaaf
Mark Swenson
Michael Robertson
Mark Vierling
Roger Benson
Mayor
Council Member
Council Member
Council Member
Council Member
Administrator
Attorney
Water Operator
Bonestroo, Rosene, Anderlik & Associates, Inc.
Architects/Engineers
St. Paul, Minnesota
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JA Bonestroo
Rosene
Anderlik &
Associates
Engineers & Architects
November 7, 1996
Honorable Mayor and City Council
' City of Oak Park Heights
P.O. Box 2007
Oak Park Heights, Minnesota 55082 -2007
Re: Water Supply Plan
Our File No. 55125
' Dear Mayor and Council:
.
' Transmitted herewith is Bonestroo, Rosene, Anderlik & Associates' Water Supply Plan for the City of
Oak Park Heights. This plan has been prepared in accordance with Chapter 186 of the 1993 legislative
session laws, as clarified by Metropolitan Area Community Water S Jonly Plan Content Guidelines
' published by the Metropolitan Council and the Minnesota Department of Natural Resources. This plan
becomes the water supply component of your Local Comprehensive Plan.
t The fast section of this report contains a description and evaluation of Oak Park Heights' water supply,
including an analysis of current and future water demands, as well as water and population projections.
The Emergency Preparedness Plan serves as a guide for responding to emergency situations. A Water
' Conservation Plan completes this report by outlining and evaluating current conservation practices.
' We want to thank the City Staff for their input into this plan. It would be our pleasure to meet with the
City Council, Staff, and any other interested parties to discuss the contents of this Water Supply Plan at
any mutually convenient time.
1 Respectfully submitted,
' BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC.
Mark D. Wallis, P.E.
MDW:kf I hereby certify that this report was prepared by me or under my
direct supervision and that I am a duly Registered Professional
Engine er _s akof Minnesota.
' Mark D. Wallis, P.E.
Date: November 7. 1996 Reg. No. 19145
2335 West Highway 36 • St. Paul, MN 55113 -3898 ■ 612- 636 -4600
Bonestroo. Rosene. Anderlik and Assonat,,. lnc is an Aflirmab Ve AChun, Equal Opportunity Employer
Principals:Otto G. Bonestroo. PE • Joseph C. Anderlik, RE - •Marvin L Sorvala. PE. -
Richard E Turner. PE. • Glenn R. Cook. PE • Thomas E Noyes. PE • Robert G Schunicht. P.E
Jerry A. Bourdon. PE Robert W Rosene. PE. and Susan M Eberbn. C P.A.. Senior Consultants
Associate Principals: Howard A. Sanford. PE • Keith A Gordon. PE. • Robert R. Pfefferle. PE.
Richard W Foster, PE • David O Loskota. PE. • Robert C Rdfsek. A A. • Mark A Hanson. P.E. -
Michael T. Rautmann. PE. • Ted K Field PE • Kenneth P Anderson. PE. • Mark R. Rolfs. PE.
Sidney P Williamson. PE. l S • Robert F Korsmith
Offices. St. Paul, Rochester. Willmar and St Cloud. MN • Mequon. WI
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Table of Contents
Water System Emergency
Preparedness Plan
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Executive Summary
Introduction ..................... 1
Growth and Water Demand ......... 1
Existing Facilities ................. 1
Recommended Water System
Improvements ................... 2
Conservation and Emergency
Preparedness .................. 2
Impact on Local Comprehensive Plan . 2
Recommendations ................ 2
Water Supply Description and
Evaluation
26
Water System Policy ..............
4
Water Demand Analysis ...........
4
History of Water Use ...........
4
Per Capita Water Use ...........
8
Water Demand by Customer
Alternative Source of Water ........
Category ..................
9
Large Volume Customers ........
12
Seasonal and Peak Demands .....
13
Monthly Water Use by Customer
Procedures for Water Allocation
Category ..................
13
Population Projections ..........
13
Projected Water Demands .......
14
Existing Facilities
Water Supply Protection
Raw Water Supply .............
16
Treatment ....................
16
Storage ......................16
Resource Monitoring ...........
Distribution System ............
17
Adequacy of System to Supply Demand
Power .......................32
Supply- Storage Considerations ...
17
Water Supply .................
19
Treatment ....................19
Communication Systems .......
Storage ......................19
Sensors ......................33
Distribution System ............
21
Proposed Facilities ................
21
Raw Water Supply .............
21
Treatment ....................
22
Storage ......................22
Emergency Response Procedures
Distribution System ............
22
Water System Phasing ..........
23
Capital Improvements Program ...
24
Purpose .........................26
Emergency Telephone list ..........
26
Current Service Area ..............
26
Procedure for Augmenting Water Supplies
Interconnect with Communities
... 27
Conjunctive Use of Surface and
Ground Waters ................
27
Alternative Source of Water ........
27
Demand Reduction Procedures
Demand Reduction Potential .....
27
Short-Term Demand Reduction
... 28
Procedures for Water Allocation
.. 28
Triggers for Implementing Plan
Components .....................
29
Enforcement .....................30
Water Supply Protection
Analysis of Supply Problems .....
31
Wellhead Protection ............
31
Resource Monitoring ...........
31
Emergency Resources ............
31
Power .......................32
Labor .......................32
Control Systems ...............
33
Communication Systems .......
33
Sensors ......................33
Security ......................33
Operation and Maintenance
Manuals ...................34
Replacement Parts .............34
Emergency Response Procedures
Water quality .................34
Storms ......................36
Droughts .....................
36
Personnel ....................36
Emergency Phone Numbers .........
37
Emergency Reporting Form ........
38
Water Conservation Plan
Role of Conservation .............. 39
Water Conservation Potential ....... 39
Per Capita Water Use ........... 40
Water Supply Plan i
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' Location Map (Back of Plan)
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Water Supply Plan
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Water Demand by Customer
Category ..................40
Seasonal and Peak Water
Demands ..................42
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Water Conservation Programs .......
42
Metering .....................
42
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Water Audits, Leak detection .....
Water Rates
43
.. 43
Regulation ...................44
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Education and Information
Programs ..................44
Retrofitting Programs ...........
45
Pressure Reduction .............
45
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Appendix A Water Related City
Ordinance
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Appendix B Agency Review
' Location Map (Back of Plan)
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Water Supply Plan
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�ACCUii v e a uriiiilary
Introduction
This report represents a Water Supply Plan for the City of Oak Park Heights. This report is intended
to be used to satisfy the requirements of the Laws of Minnesota 1993, Chapter 186 and to serve as
the basis for the planned expansion of the trunk water system. Once adopted, this plan becomes the
water supply component of your Local Comprehensive Plan. The three main sections of this report
are: Water Supply Description and Evaluation, Water System Emergency Preparedness Plan, and
Water Conservation Plan.
Growth and Water Demand
Oak Park Heights population was been steadily increasing to the current served population of 3,800.
The City does not anticipate a significant change in this trend, and expects their served population
to grow to 6600 people by the year 2020. Oak Park Heights currently pumps 522,000 gallons of
water on an average day and pumps 1. t million gallons of water on a peak day.
Water use has increased with the increase in population. Oak Park Heights currently pumps an
average of 522,000 gallons per day and reaches an estimated peak demand of 1.6 million gallons per
day (MGD).
Existing Facilities
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The existing water supply and distribution system is in good condition and has served Oak Park
Heights's needs well. The City obtains its raw water from two wells in the Jordan aquifer. The
peak production capacity of these wells is 2.4 MGD. Fluoride is added to prevent tooth decay.
Two elevated storage facility stabilizes pressure during peak water demands and also serve as a
source of water during fires or power outages. There is a total existing storage volume of 750,000
gallons.
Water Supply Plan 1
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' Recommended Water System Improvements
' The City's near-term need is for a new production well. The recommended improvements for supply
and storage are estimated to cost $500,000 by the year 2020. These costs will be financed by
connection charges and trunk area charges. Oak Park Heights should investigate the feasibility of
interconnections with neighboring cities.
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' Conservation and Emergency Preparedness
' Oak Park Heights should work hard to decrease its level of water usage. Water conservation will
protect a valuable resource and delay or minimize system improvements required.
1 This plan establishes a water allocation system in the event Oak Park Heights needs to ration water
' during an emergency. Quick responses to restrict non - essential uses of water during periods of
limited supply will help protect domestic and economic uses of water. The plan also outlines steps
to be taken in the event of a storm, power outage, or other disruption of the water system.
' Impact on Local Comprehensive Plan
The Water Supply Plan was prepared based on the 1979 Comprehensive Plan for the City. The City
' is in the process of developing a new land use plan. This plan will be complete in 1998. As land
use assumptions are altered in future years, the water system designed in this report must be revised.
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Recommendations
Based upon the results of this report, the following are recommendations for the City of Oak Park
Heights and the Oak Park Heights City Council.
1. Adopt this study and submit it to the Metropolitan Council and Department of Natural
Resources for their Approval.
{Pater Supply Plan 2
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2. Continue to keep records of daily pumping from each well in order to determine the
maximum day demand for the system. This data will allow more accurate assessment of City
water supply needs in the future. The City has done a good job of keeping its Max Day to
Avg. Day ratio below 3. This ratio has never been higher than 2.6 in the City. The City
should continue to keep the Max. Day to Avg. Day ratio low.
3. Perform a computer analysis of the distribution system to determine optimum location and
size of future water supply and storage facilities, and future trunk water main sizes.
4. Adopt the Capital Improvement Program contained in this report. Review the water system
financing program. Ensure that developer costs and connection fees are sufficient to pay for
trunk system improvements. Continue your policy to annually verify that the water rates are
sufficient to pay for the operation and maintenance of the system.
5. Monitor water quality and customer complaints to ensure compliance with drinking water
quality standards and to determine the need for water treatment.
6. Adopt a resolution that gives the City the authority to enforce the water allocation measures
in this plan.
7. Establish a Water Utility Committee. Tasks for this committee include: annually review this
Plan and the effectiveness of the Water Conservation Plan, review the customer categories
and billing system, facilitate discussions with Minnesota Corrections Facility and
Washington County to determine the feasibility of short-term and long -term water reduction
measures, and investigate inter -community shared resources for water system emergencies.
This entire Plan should be revised every 5 years. The plan will need to be revised and
resubmitted to the DNR and Met Council every 10 years.
8. Coordinate this report with the future wellhead protection plan. Incorporate pertinent results
from the wellhead protection plan into your Emergency Preparedness Plan.
lVater Supply Plan
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Water Supply Description and Evaluation
Water System Policy
The policy of the Oak Park Heights water supply system is to provide the consumers with safe, high
quality, and affordable drinking water. The system will provide this vital service while assuring the
long -term protection of our supply from contamination and excessive depletion.
' The development of a water system capable of supplying and distributing potable water of high
quality to all points of demand at acceptable residual pressures requires advanced planning. Such
a system is dependant upon a strong network of trunk water mains complemented by properly sized
and strategically located supply and storage facilities.
Water Demand Analysis
' An analysis of Oak Park Heights' water demand is important to ensure present and future capacity
requirements are met for the four water system components; supply, treatment, storage, and
' distribution. These requirements are regulated by distribution demands and production capability.
' Water demand (both peak and average) is affected by many factors including population, population
distribution, commercial and industrial activity, water quality, water rates, climate, soil conditions,
' economic level of the community, sewer availability, water pressures, and the condition of the water
system. One of the most important factors is land usage, which encompasses population and non-
residential use activity. The City currently bases supply, storage, and distribution on present water
usage and is continuously evaluating water use trends and land usage in order to project future water
usage.
' History of Water Use
' Oak Park Heights' monthly water use records from January of 1985 through December of 1995 are
' presented in Figure 1. Table 1 shows the total water use data for the years 1985 through 1995.
Water Supply Plan 4
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Included in the table are the annual water pumped, average day. maximum day, maximum month
minimum month and average month data. The City records monthly pumpage as shown on Table
1 and will continue to do so in the future. Maximum month demand for each year is highlighted in
' Table 1.
' Oak Park Heights is considered to be an outer ring suburb that is experiencing modest growth. The
population is expected to increase to 4,200 people by the year 2000. In addition, a large percentage
of the population is connected to the water system. Any additions to the system would be minimal
' over the course of the next planning period. Oak Park Heights' water pumpage records over the past
eleven years indicates water demand varies seasonally. As shown graphically in Figure 1, demand
is lowest during the winter months, and highest during the late spring and summer months. All of
the peak demand days during the past eleven years occurred during the summer months. Outdoor
' watering uses such as lawn sprinkling are primarily responsible for the increased demand during the
spring and summer months.
Climatic conditions also influence water use patterns, and weather patterns have the greatest impact
on peak day demands. Oak Park Heights experienced increased demand during the drought years
' of 1987 -1989 and decreased demand during 1990 -1993, which was marked by cool temperatures and
above average rainfall.
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Water Supply Plan
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Per Capita Water Use
Table 2 summarizes the residential connections, total annual and residential water usage and
population served by the City of Oak Park Heights since 1988. This information was used to
determine the total water use per capita (gpcd) listed in the sixth column of Table 2 and the
residential water use per capita (gpcd) listed in the final column of Table 2. The average total water
use per capita of 128.6 gpcd, as shown graphically on Figure 2, includes residential, institutional,
' commercial /industrial and all other miscellaneous water demands (flushing of water mains, street
projects, fighting fires, etc) placed on the water system.
Table 2. Per Capita Water Use 1988 - 1995
Year
Served
Population (1)
Residential
Connections
Total Annual
Water Use
(NAG)
Total Per
Capita
Water Use(2)
( €pod)
Annual Res.
Water Use
(MG)
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Residential
Per Capita
Water Use (3(
(gpcd)
1988
3360
640
151.638
123.6
96.953
79.1
1989
3423
680
156.854
125.5
91.776
73.5
1990
3486
688
155.316
122.1
76.814
60.4
1991
3549
720
162.939
125.8
85.784
66.2
1992
3612
764
176.545
133.9
99.831
75.7
1993
3675
803
167.186
124.6
86.165
64.2
1994
3738
836
185.524
136.0
94.110
69.0
1995
3800
943
190.530
137.4
94.176
67.9
1 City estimates.
1 2 Total Per Capita Water Use (gpcd) has been calculated by dividing the total annual water usage by the population
serviced, divided by 365 days.
3 Residential Per Capita Water Use (gpcd) has been calculated by dividing the residential water usage by the population
serviced, divided by 365 days.
1 Figure 2 illustrates total both total and residential per capita water use over the past eight years. The
residential per capita water use from in 1995 was 67.9 gpcd, and the per capita use is expected to
decrease slightly over the next planning period due to household plumbing fixture replacements.
The 1992 Federal Energy Policy Act requires that all toilets, faucets and showerheads manufactured
after 1993 meet stringent water flow requirements. As the majority of the housing stock in Oak Park
1 Heights was constructed prior to 1994, most of the homes will have high use plumbing fixtures. As
new homes are constructed and the existing fixtures are gradually replaced with lower consumption
1 Water Supply Plan 8
fixtures, the households' individual per capita use will decrease. However, in the immediate future,
outdoor watering practices will have the biggest effect on per capita consumption. Oak Park Heights
is planning to provide public education about conservation efforts (such as the most effective time
to water lawns) and awareness of water trends to decrease water demand. In addition, Oak Park
Heights will continue to strictly enforce the state plumbing code to ensure appropriate plumbing
fixture installation and replacement.
200
ra 150
a
j 100
y
c
0
0 50
V..,
—F Total Per Capita Water Use - Residential Per Capita Water Use
� Ten Year Total Average � Ten Year Residential Average
Water Demand by Customer Category
The City has been keeping track of water pumping records and has broken their water use into four
main categories of water users, residential, institutional /commercial, and industrial. Table 3 shows
the number of connections by customer category for the years 1984 to 1995. Table 4 shows the total
use and percentage of use by customer category and unaccounted for water use (water pumped less
water sold).
Water Supply Plan
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Table 3. Water Connection Summary
Year
I �
Number of Connections �
Residential
Institutional
Commercial
Industrial �
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1988
741
8
77
0
1989
776
8
88
0
1990
794
8
88
0
1991
828
6
92
0
1992
857
6
97
0
1993
888
9
100
0
1994(1)
906
9
104
0
1995(2)
943
-
106
0
M i"4 nunmersarc C$amatco
(2) 1995 Institutional were combined with commercial
In 1995, there were an estimated 1,049 connections to the water system; 943 of those connections were
residential.
From 1988 - 1995, residential connections grew by approximately 47% from 640 connections to 943
connections. About 90% of the total connections to the water system were residential, yet, the residential
water use is approximately 49% of the total water use, as shown on Table 4. Table 4 and Figure No. 3
summarize water usage by customer category and percentage of total water used.
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Table 4. Water Usage by Customer Category
Figure No. 3
Water Use by Customer Category
1988 -1994
Unaccount
Comm. 18.1%
I nstitut. 1
52.5%
Water Supply Plan
( t) 199.) institutional and commercial use are combined
(2) Based on data from 1959 through 1994.
The unaccounted for water use has stayed fairly stable, with an overall system average of 12.2% from
1988 - 1994. The "unaccounted" category in Table 4 and Figure No. 4 pertains to water used for
flushing existing water mains and new street projects, fighting fires, city sprinkling and use and
unaccounted for water due to water main leaks, breaks, meter inaccuracies, etc. American Water
Work Association (AW WA) recommends that water systems maintain a 10% or less unaccounted
for water use. Oak Park Height will continue to make moves to improve the distribution system and
respond efficiently to leaks in order to reduce unaccounted for water below 10 %.
Large Volume Customers
The records of the top ten water users for the City are identified in Table 5. Two of these users
consume more than 5% of the total water pumped. The two large volume customers in Oak Park
Heights are Minnesota Correctional Facility and Washington County.
Table 5. Top Ten Water Users 1995
(in MG)
Customer
Quarter
Beginning
9/30/95
Quarter
Beginning
6/30/95
Quarter
Beginning
3/31/95
Quarter
Beginning
12/31/94
Total.
MN Correctional Facility
4.675
4.180
4.731
4.919
18.505
Washington County
5.383
3.374
2.165
2.232
13.252
St. Croix Car Wash
0.786
0.933
1.495
1.182
4.396
Sunnyside Apartments
0.881
1.024
0.761
0.790
3.456
ISD #834
0.767
1.004
0.733
0.822
3.326
St. Croix Cleaners
0.846
0.759
0.675
0.725
3.005
Birchwood Apartments
0.756
0.837
0.691
0.670
2.954
Oak Park Heights Apts.
0.770
0.815
0.654
0.644
2.883
Oak Ridge Place
0.556
0.611
0.596
0.695
2.458
R.J. Estates
0.549
0.588
0.547
0.563
2.247
I Water Supply Plan 12
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Seasonal and Peak Water Demands
Analysis of the well pumping records listed in Table 1 allows a relationship between minimum and
maximum months, the estimated maximum day, and the average day water use to be established.
This relationship defines seasonal changes and can assist in determining potential demand reduction
periods. Figure I shows that demand increases through the spring to a peak demand occurring
during the summer months. Demand drops off through the fall to a minimum during the winter. This
is a common pattern with municipal water use. As temperature increases, water use increases due
to a greater demand for lawn maintenance.
r The City should begin to track daily water pumping records. The maximum daily pumpage is a key
indicator of the effect of water conservation measures and required system improvements.
I Monthly Water Use by Customer Category
' The City of Oak Park Heights does not break down the monthly usage by customer category. The
City will look into keeping these records in future.
Population Projections
Oak Park Heights's population has been steadily increasing over time. From 1990 to 1995 the City
has experienced a 9% increase in total population. Oak Park Heights's population is expected to
continue on its current trend over the next ten years. The current population estimates are based on
the current Land Use Plan (1979) and Metropolitan Council projections. The City is currently in the
1 process of developing a new land use study. This study should be complete by the year 1998. The
Water Supply Plan will need to be updated as current land use plans are changed.
Water use is expected to increase with population and the addition of new industrial and commercial
business into the City. Table 6 gives Metropolitan Council and City population estimates.
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Water Supply Flan 13
T able 6. Pop Pr
(1) Source: Metropolitan Council Staff Review Projections, assume 2.35 people per household.
Projected Water Demands
Water use is expected to increase with population and the addition of new industrial and commercial
business into the City. In the next few years, the City will be preparing a more detailed land use
planning.
In the meantime, this planning document assumes that the relative percentage of commercial to
August 14, 1996 residential water use will remain constant. Therefore, the total per capita water use
would remain at 137 gpcd with no water conservation measures.
Water Supply Plan 14
Metropolitan Council Projections
City Projection
Year
Blueprint
Current
i Trend in
Concent.
Ovipmt.a)
Growth
Centers (l)
Employ.
I
Served
Population
1995
3,408
NA
NA
NA
NA
3,800
1996
NA
NA
NA
NA
NA
3,850
1997
NA
NA
NA
NA
NA
3,900
1998
NA
NA
NA
NA
NA
4,000
1999
NA
NA
NA
NA
NA
4,100
2000
3,995
3,878
3,878
3,878
3,470
4,200
2005
NA
NA
NA
NA
NA
4,700
2010
4,700
4,935
5,170
5,170
3,660
5,200
2020
1 5,405
5,875
6,580
1 6,580
3,720
6,600
(1) Source: Metropolitan Council Staff Review Projections, assume 2.35 people per household.
Projected Water Demands
Water use is expected to increase with population and the addition of new industrial and commercial
business into the City. In the next few years, the City will be preparing a more detailed land use
planning.
In the meantime, this planning document assumes that the relative percentage of commercial to
August 14, 1996 residential water use will remain constant. Therefore, the total per capita water use
would remain at 137 gpcd with no water conservation measures.
Water Supply Plan 14
Table 7 shows the projected water use based on the City's water conservation Plan.
Table No. 7
Projected Water Use
The population and water use estimates in Table 7 are used to build the Capital Improvements Plan
for the City. If conservation is more effective or City land use changes, improvements on the plan
would be delayed or eliminated as needed. Actual growth rates will affect only the timing of
construction and not the actual design of the system. Additional wells, treatment capacity, and
storage are added only as growth occurs, thus ensuring that facilities are constructed only as needed.
Water Supply Plan 15
Existing Facilities
Raw Water Supply
The City of Oak Park Heights obtains its raw water from two deep wells in the Jordan aquifer. The
main production well was constructed in 1968, and provides a total capacity of 850 gallons per
minute (gpm) or 1.22 million gallons per day (MGD). The second well was constructed in 1975 and
is used as a standby well. This well also has a capacity of 850 gpm (1.22MGD). This gives the City
a firm capacity (capacity with the largest well out of service) of 1.22 MGD, and a total capacity of
2.44 MGD.
Treatment
The City of Oak Park Heights does not have a water treatment plant at this time. The water is treated
with fluoride at the well pump houses and pumped directly into the distribution system. Both well
are equipped with chlorination feed systems, however these systems are not in use at this time.
Storage
Storage is an essential part of all water systems. It allows fluctuations in water demands to be met
without having additional pumping capacity in reserve which would only be utilized during peak
hourly demands. Although the rate of consumption is high during periods of maximum hourly
demand, the duration of the extreme rate is relatively short. Therefore, a moderate quantity of water
strategically located on the system assures satisfactory service, minimizes the total maximum hour
pumping and transmission main capacity required, and permits more uniform and economical
operation of the system and pumping facilities.
Storage is also an important factor in ensuring reliability of service during emergencies resulting
from loss of power, temporary outages of water supply facilities, and sudden water demands brought
on by fires.
The City of Oak Park Heights currently has 750,000 gallons of useable storage in the system. A
summary of these facilities is presented in Table 8.
Water Supply Plan 16
Tahle R Fxictina gtornn Faeiliti
High Water
Level
Reservoir
i'pe
Storage Volume
( (Gall
Year
Constructed
1084
Elevated
250,000
1967
1084
Elevated
500,000
1991
Distribution System
The existing distribution system consists of lines that vary in size from 4 inch to 12 inch diameter.
All mains are DIP. Static pressures range from 60 to 90 pounds per square inch (psi). throughout
the system. The City has not had any problems with low or high pressure areas in the distribution
system.
Adequacy of System to Supply Demand
The existing water supply and distribution system has sufficiently served the City of Oak Park
Heights. Planned improvements and expansion of the system has kept pace with the demands placed
on the system. The entire system remains in very good condition primarily because of the
implementation of a good maintenance program.
Supply- Storage Considerations
Supply capacity, storage volume, and distribution system are strongly interrelated. Reservoirs act
as additional supply sources during peak periods when the primary supply source is incapable of
meeting demands. Thus, the storage tends to stabilize the peaks in water demand and allows the
system to produce water at a lower, more uniform rate.
An infinite number of supply and storage combinations can be used to meet peak water demands.
For the majority of metro area communities, the ideal combination of supply and storage is when the
supply equals 100% of the maximum day demand. This is consistent with recommendations in both
Recommended Standards for Water Work by Great Lakes Upper Mississippi River Board,
American Water Works Manual of Practice M32 - Distribution Network Analysis for Water Utilities
Water Supply Plan 17
The amount of storage required for Oak Park Heights can be determined by looking at the maximum
day variation curve (shown in Figure 5), at average daily use, and at fire flow demands. Another
concern regarding the amount of storage is the tendency for water to freeze in the tanks if sufficient
demands are not present in the winter.
The maximum day demand curve shown in Figure 5 comes from our experience with other
communities and typical textbook demand curves. As more accurate data becomes available this
curve should be revised.
The hatched area above the maximum day demand line in Figure 5 represents 25% of the maximum
day total demand. This percentage takes into account hourly fluctuations and will have to be
provided by storage facilities. In addition to that, a safety factor of 5% was added based on actual
' operating levels in the towers being 2 or 3 feet lower than the high water level, and to ensure the
tower does not empty. Therefore, a minimum of 30% of maximum day demand is required for
' storage. Effective storage is considered to be water available for use at an adequate residual pressure
(not lower than 40 feet below the system high water level).
Figure No. 5
Maximum Day Demand Curve
a
;200
d 180 Peak Demand
0 1 60 (2 Times Maximum Day)
6 140 Demand Variatiot
I
E120 j oo Maximum Day
m $0 Demand
0 60 Supply= l00%n of
m 40 Maximum Day Demand
20
a 0
0 2 4 6 8 10 12 14 16 18 20 22 24
Midnight Time of Day Midnight
Water Supply Plan 18
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Water Supply
The City manually measures water levels at the well annually. There does not appear to be any
extreme draw -down problems at this time. The ability of the Jordan aquifer to meet existing and
future demands, and the susceptibility of contamination of the aquifer will be the subject of a future
study. The City will complete a Wellhead Protection Plan in accordance with the rules expected to
be promulgated in 1996.
Firm capacity is defined as the available capacity with the largest well out of service. Since Oak
Park Heights has a back -up well, the City has 850 g.p.m. (1.22 MGD) firm capacity. Well pumps
need to be pulled for maintenance approximately every seven years. Pump repairs can take a week
or more, depending on the extent of repairs required. While the pump is being repaired, the City will
have to use their standby pump.
The firm capacity of the wells is less than the maximum day demand. The City should consider
adding a well to increase the reliability of the supply
Treatment
The water quality for the well shows low levels of iron and manganese. The City's water is hard at
about 210 mg/L or 12.3 grains. In -home water softeners will remove hardness for residents who
desire softer water.
Storage
There are four criteria for determining the amount of storage required. Normally, these criteria
would be evaluated in detail using a computer model of Oak Park Heights's water system. The
computer model is used to verify the amount of storage required, and to verify that the storage is
located such that the distribution system can distribute the water to the demand locations. Without
a computer model, the following generalizations can be made.
• Maximum Day Demand Variations: Storage on the system acts as an additional
supply to meet the hourly demand peaks during the maximum day. From Figure 5,
the required storage equals 30% of the maximum day demand, or 362,000 gallons in
1995. Using this criteria, Oak Park Heights has sufficient storage.
hater Supply Plan 19
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Average Daily Use: Recommended Standards for Water Work published by the
Great Lakes Upper Mississippi River Board recommends that storage be at least
equal to the average daily use. Oak Park Heights's 1995 average day demand was
522,000 gallons. Using this criteria, Oak Park Heights has sufficient storage.
Fire Protection: The Insurance Services Office (ISO) recommends that most cities
be capable of delivering a fire demand of 500 gpm to 3,500 gpm for varying
durations depending on the rate of demand. Recent experience with many
commercial and industrial users has shown that 2,000 gpm is usually sufficient to
operate their sprinkler systems. Residential areas require a flow rate of 500 gpm to
1,000 gpm depending on home spacing. Based on these criteria, the following
storage volumes would be required.
Table 9. Storage Requirements
Land Use
Required Fire Flow
(rpm)
Duration
(hours)
Storage Required
(gallons)
Commercial
3,500
3
630,000
Commercial (Sprinkled)
2,000
2
240,000
Residential
1,000
2
120,000
Using fire protection as a criteria, Oak Park Heights has more than a sufficient amount
' of storage.
• Minimum Use: In a northern climate, sufficient turnover of water is required to
i prevent the water from freezing in the storage reservoir. A fair rule of thumb is that
the volume of water in the reservoir should be replaced every three days during
minimum demand periods in the winter. In 1995 Oak Park Heights averaged .464
MGD during the winter months (Nov. -Feb). At this rate the tanks will turn over about
every 1.5 days. The City will need to be careful to make sure the turn over rate stays
below three days if capacity is added in the future. The City may want to consider
installing a mixers in the tanks to keep the water from freezing if the turn over rates
increase.
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Conclusion: Oak Park Heights has sufficient storage on the system at this time.
There is sufficient capacity available for fire protection. Flow tests should be
conducted to verify that adequate pressures can be reached throughout the system.
If additional storage is added in the future freezing may become a maintenance
problem in the winter.
Water Supply Plan
20
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Distribution System
It is important that the City properly plan for anticipated growth of the water system. The
development of a water system capable of supplying and distributing potable water of high quality
to all points at acceptable residual pressures requires advance planning. Such a system is dependent
upon a strong network of trunk water mains complimented by properly sized a strategically located
supply and storage facilities. It is necessary to ensure that adequate facilities are provided during a
significant growth period. Without proper planning, haphazard and piece -meal construction can
result in either undersized or over -sized facilities. A computer analysis of the distribution system
should be performed to evaluate the following parameters:
• Tank Operation: Minimum level, able to refill tank overnight, and total operation
time.
• High Pressure Areas: Identify high pressure areas during tank filling (low demand)
periods.
• Low Pressure Areas: Identify low pressure areas during high demand periods.
• High Headloss Lines: Identify pipes that have unusually high headloss during tank
filling or high demand periods.
• Fire Flows: Make sure that all areas of the distribution system are able to get
sufficient fire flows, while maintaining a minimum 20 psi residual pressure.
Proposed Facilities
1 Raw Water Supply
The best way to meet the demand conditions in Oak Park Heights is to have a total well capacity
' equal to 100% of the maximum day demand. Oak Park Heights current maximum day demand is
estimated to be 1.1 MG.
' A total of four wells will be required to meet the anticipated demands in the year 2020 (2.72 MGD).
Assuming an average future well capacity of 850 g.p.m., two additional wells are required by the
year 2020. A new well is needed immediately to provide firm capacity equal to the maximum day
demand. An additional well may be required depending on changes to the existing land use plan.
Water Supply Plan 21
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Phasing of future wells is shown in Table 10. Future water use patterns and conservation measures
will affect the number of wells required.
A hydrogeologic study of the well field should be initiated to identify potential locations for
additional well sites, and serve as the basis for a wellhead protection plan. Legislation passed in
1993 requires all public water suppliers to prepare a wellhead protection plan. The purpose of the
plan is to protect the supply of water from contamination. Final rules for preparing the plans are
being put together by the Minnesota Department of Health. It is expected the final rules will be
adopted in 1996.
' Treatment
At this time, no additional treatment is proposed.
Storage
Based on current land use trends, additional storage will not be required in the near future. Storage
may be required if land use changes were to occur. A new land use plan will be completed by 1998.
This section will need to be updated as land use in the City changes.
The City should perform a computer analysis of the water system to determine the optimal location
and to verify the required size of the future reservoir. The reservoir should be located to take
advantage of high ground, to minimize construction costs. The reservoir should also be located at
1 a point in the distribution system that compliments the primary supply points and thereby maintains
more constant water pressure during peak demand periods.
Distribution System
A detailed analysis of the distribution system should be performed with a computer model. In
general, trunk water mains in CommerciaVIndustrial areas must be a minimum of 12 inch to provide
sufficient fire flows. For a community of approximately 3800 people, a storage system of mains
connecting supply, storage and high demand areas may be required. The sooner that the ultimate
distribution system is established, the easier the necessary improvements can be integrated into
developers' plans and the City's Capital Improvement Program.
Water Supply Plan 22
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Water System Phasing
Oak Park Heights' projected 2020 served population is 6600 people. Based on the projected
population growth and water demands presented in Table 5, additions to the supply and storage
' facilities are presented in Table 10. These additions will keep pace with the increasing needs of the
service area and at the same time maintain a desirable balance between supply and storage for
economy and reliability. If growth rates differ from the rates outlined in this report, the phasing
schedule should be revised in accordance with the latest available data. Due to the long construction
' period for supply, storage, and treatment facilities, construction must begin one to two years before
they are actually required. Sites for these facilities should be acquired immediately.
Table No. 10
Supply and Storage Phasing
FM
E P E P I R413
955
P75
1997
9701.393
970
1700
.418
.75
Add Well 3
1998
995/.429
995
1700
.429
.75
1999
1020/.464
1020
1700
.439
.75
2000
1045/.500
1045
1700
.450
.75
2005
1170/.679
1170
1700
.504
.75
2010
1290/1.857
1290
1700
.557
.75
2020
16401.357
1640
1700
.707
.75
(1) Estimated values based on conservation goals discussed in the "Projected Water Demand ".
' (2) 100% of Maximum Day Demand as recommended in this report.
(3) All new well capacities are based on 850 gpm, numbers based on total firm capacity.
(4) Estimated value based on the ratio of storage to moximum day demand (30 %) and required fire protection.
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' Capital Improvement Program
A capital improvement program for the Oak Park Heights's water supply, distribution and storage
system is presented in Table 11. The table shows the supply, treatment, distribution and storage
facilities to be added and the estimated construction costs for each year. The capital improvement
program has been based on supply- storage phasing of Table 10. The cost estimates in this report are
based on July 1996 construction costs and can be related to the value of the ENR Index for
Construction Costs of 5617. Cost estimates include 35% for contingencies and administrative, legal,
' and engineering costs.
The City will have a new Comprehensive Plan completed by the year 1998. This study must be
completed before the location of future wells, towers, and trunk water mains can be determined.
Trunk water mains should be added as development occurs. Due to the uncertainty of exact
' development patterns at this time, trunk and lateral water mains are not included in the phasing
schedule or Capital Improvement Program.
Most of the improvements described in Table 10 should be funded through charges against new
' development. When Oak Park Heights considers treatment, all types of treatment should be
considered, as well as connections to adjacent community water systems.
Table No. 11
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Water System Capital Improvement Program
1996
1997
Well No. 3
$510,000
1998
1999
2000
2005
2010
2020
Total Ultimate Trunk Water System:
$510,000
Water Supply Plan 24
' Oak Park Heights funds water system capital improvements from a combination of area charges
(based on availability of water service to an area), connection charges (at the actual time of hook -up),
and assessments. The City regularly revises these funding mechanisms to ensure that they are
adequate. The City will prepare a Capital Improvements Plan in the near future.
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Water Supply Plan
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1 Water System Emergency
1 Preparedness Plan
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v v�atul Oy atMii?i E ILer genucy Preparedness 1 ldil
1 Purpose
The purpose of this plan is to prepare a detailed description of procedures to follow in the event of
a disruption to normal water service. The disruption could be natural or man-made, and could affect
the entire water system or only parts of the system. This plan cannot address all potential disasters.
It is intended to give the water utility staff a guideline to allow them to quickly restore normal water
' service with a minimum of disruption, and to minimize any potential health risks. This plan should
be coordinated with the emergency plans of other City and regional entities; Police, Fire, Public
' Works, etc.
' Emergency Telephone List
The Emergency Telephone list is attached. Work and home phone numbers of key emergency
contacts and the 24 hour cellular contact are included on Oak Park Heights's phone list, which is not
included as a part of this document for data privacy reasons. Also attached is an Emergency
Information Reporting form. This form will not cover all emergencies that the City may experience;
however, the form will help standardize the reportingtrecording process. A standard question format
r will help staff persons collect accurate and specific information about the emergency so that the
proper response can be initiated without delay.
i Current Water Sources and Service Area
Oak Park Heights' DNR appropriation permit number is 75 -6123. There are a total of 1049 service
connections as of January 1, 1996. Oak Park Heights does not have any surface water sources. Oak
Park Heights has two wells connected to the municipal system both of which are permanent sources.
' Both wells #1 and #2 are located in the Jordan aquifer. A summary of the well data is included in
Table 12. A map illustrating the locations of existing and future wells is shown in the back of the
' report. A detailed discussion of Oak Park Heights's water sources is found in the "Existing
Facilities" section of the Water Supply Description and Evaluation.
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Water Supply Plan 26
Prnrerlruire Fnr Ana_mp_n_tina Wntar Qn"imMac
Yab v Yaaav , � yYyl V Yil1./11 {.J
The following alternatives exist for additional supplies of water.
Interconnect with Adjacent Communities
Currently, the City does not share any interconnections with adjacent communities. Connections to
Stillwater and Bayport will be evaluated in the future.
Conjunctive Use of Surface and Ground Waters
Although Lake St Croix borders the City, the conjunctive use of surface and ground waters is not a
viable option for the City of Oak Park Heights at this time. It is not considered a suitable source of water
for water suppliers. It would be extremely costly for Oak Park Heights to build water treatment plants
with the necessary equipment to treat surface water to potable standards.
Alternative Sources of Water
The City of Oak Park Heights utilizes the Jordan aquifer. Other possibilities for water supply provisions
during extended emergency periods would be to either bring potable water in via trucks, or investigate
the possibility of purchasing water from neighboring communities.
Demand Reduction Procedures
Demand reduction procedures should be initiated during unusually high demand periods or shortage of
water due to an emergency. The restrictions should relate to the severity of the emergency or shortage.
Demand Reduction Potential
Oak Park Heights' usage during the summer months is higher than during the winter months. In the
future it is important that the city keep track of daily pumpage to improve evaluation of demand
reduction potential. For demand/supply emergencies during the summer months, sprinkling bans can
easily be instituted for all of the customer categories. These sprinkling bans would have the potential
Water Supply Plan
27
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for significant short-term demand reduction. The City should initiate discussions with the Minnesota
Correctional Facility to determine short-term demand reduction potential at that facility.
Short -Term Demand Reduction Procedures
The following short-term demand reduction measures are a current part of Oak Park Heights'
conservation plan. The measures are progressively more stringent for use as the length or severeness
of the emergency warrants. Triggers for each of these measures are outlined in the following sections.
1. Voluntary Reduction Measures: Public service announcements, door -to -door notices, direct
mailing, community bulletin boards, Cable T.V. and notices in the local paper.
2. Sprinkling Bans: The City currently has a water policy that authorizes the City Administrator
to issue restrictions on lawn sprinkling at anytime (copy attached).
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3. Water Allocation Restrictions: Based on severity of emergency and water use priorities
established in next section.
Procedures for Water Allocation
Initial emergency response will include actions to augment supplies and/or reduce demands. However,
severe water shortages may require the City of Oak Park Heights to allocate water based on the following
priorities. These priorities are established by Minnesota Statutes 103G.261.
' Non - essential uses of water are the lowest use priority and will be the first water use subject to allocation
restrictions. Quick responses to restrict non - essential uses of water during periods of limited supplies
' will help protect domestic and economic uses of water. Therefore, the City of Oak Park Heights will
be quick to step in and limit the non - essential use of water.
fry:
Water Supply Plan
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First Priority. Domestic water supply, excluding industrial and commercial use of municipal water
supply, and use for power production (which currently does not apply to Oak Park Heights) that meets
contingency requirements.
Notify all customers
Second Priority. Water uses involving consumption of less than 10,000 gallons per day.
Notify all commercial/industrial customers
Third Priority. Agricultural irrigation and processing of agricultural products.
Does not apply to Oak Park Heights
Fourth Priority. Power production in excess of the use provided for in the contingency plan under first
priority.
Does not apply to Oak Park Heights
Fifth Priority. Uses, other than agricultural irrigation, processing of agricultural products, and power
production.
Does not apply to Oak Park Heights
Sixth Priority. Non - essential uses. These uses are defined by Minnesota Statutes 103G.291 as lawn
sprinkling, vehicle washing, golf course and park irrigation, and other non - essential uses.
Notify all customers
While initial emergency responses may include actions to augment supplies and/or reduce demands,
severe water shortages would require water allocation in accordance with these priorities.
Triggers for Implementing Plan Components
The critical factor in the Oak Park Heights water system is the well pump supply. The following triggers
are initiated based on the percentage of well capacity. The triggers will be updated when future wells
are added.
Water Supply Plan
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Measure % of Well Capacity MGD(I)
Firm Capacity: 1.22
Voluntary Reduction Measures Always Always
Odd/even Sprinkling Ban 85 1.04
Total Sprinkling Ban 90 1.10
Eliminate 6th Priority Allocation 95 1.16
Eliminate 2nd Priority Allocation 100 1.22
(1) Firm capacity is the capacity of the wells with the largest well out of service.
Enforcement
The City has a water policy that gives the City Administrator, in consultation with the Publics Utilities
Superintendent, authorization to issue restrictions on lawn sprinkling. Such restrictions may include
an odd/even sprinkling ban or limitations on the hours of the day ro the days of the week during which
lawn sprinkling is prohibited. In addition, the Administrator may declare a total sprinkling ban if
needed.
' The focus of Oak Park Heights's short-term demand reduction plan is on voluntary reduction of non-
essential uses of water. The City mails notification of the possibility of sprinkling bans with the spring
bills. In this mailing the City informs customers that notification of the sprinkling bans will be made
in the City's two local papers, the Gazette, and the Courier.
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Enforcement will become more stringent as the emergency progresses. Odd/even sprinkling bans will
be monitored and enforced by the public works department and the Oak Park Heights Police. Failure
to comply with water use restrictions may be subject to a misdemeanor.
Water Supply Plan
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Water Q»nnly Pratpetinn
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Analysis of Previous Supply Problems
' No major repairs have been necessary and only a few minor water main breaks have occurred. The City
will be monitoring the original section of distribution piping more closely as the system ages. All tools
necessary for repairs of water lines and pump house equipment are on hand at all times. The City also
has access to pipes, valves and tools from a local supplier at all hours. As the system ages and repairs
become more necessary the City will need to increase the supply of piping as well as valves, couplings,
I etc. to reduce repair time.
' Wellhead Protection
Water supply protection is an essential part of the Oak Park Heights emergency plan. A wellhead
protection plan will be developed in accordance with the Minnesota Department of Health (MDH) rules
expected to be promulgated in 1996.
Resource Monitoring
The City periodically measures the static water levels and pumping levels in their well and will continue
' to do so in the future. This information will be used to detect significant changes in aquifer conditions.
In addition, MDH performs annual water quality testing at each of the wells in accordance with the
' provisions of the Clean Water Act. Examples of previous water quality lab results are included in Table
12 of this plan.
' Emergency Resources
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A good maintenance program can identify potential problems before they become an emergency. The
City's water system is in excellent condition, due to a proactive maintenance program. The following
are the major components of Oak Park Heights maintenance program, and recommendations for future
improvements.
Water Supply Plan
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Valves: Valves are checked occasionally as personnel are available. The City needs sufficient
personnel "on call" during valve turning operations in case a valve breaks or a leak develops.
Recommendations: establish a schedule for valve turning, maintain better records on valve
maintenance, and have sufficient personnel available to repair any problems that arise during valve
exercising. Begin to organize valve data for the City's Geographic Information System (GIS).
Hydrants: Every hydrant is checked once a year. Hydrants are also checked in the winter to make
sure they are dry. Their Fire Department is working with the Utility to accurately map all hydrants.
Recommendations: Include hydrant data in the City GIS.
Breaks/Repairs: The City maintains records of all breaks and repairs. Prior to any street
reconstruction project, the break record is reviewed to determine if pipe should be replaced.
The City has an inventory of repair parts, valves, and sleeves at the Public Works Department.
Recommendations: Include break locations on the City GIS.
Power
The City currently has no emergency backup power.
' Recommendation: Establish contacts to rent and borrow emergency generators.
' Labor
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Oak Park Heights has an emergency contractors list which specifies a variety of contractors who have
agreed to perform emergency services. The list has been included in this plan.
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Water Supply Plan
Control System
The computerized control systems for water treatment and distribution are indispensable to water supply
' operations. In case of an emergency, a municipality must have a well - planned control system.
Following are a number of alternatives to be considered for preventing failure of a computerized control
' system:
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Routine maintenance programs.
2. Backup power sources.
Communications Systems
Communication systems are vital to water supply operations. Unfortunately, communication lines, such
as telephone lines, are susceptible to many types of disasters (storms, construction accidents, etc.).
Accordingly, it is important that backup communication systems be maintained and tested regularly.
The City of Oak Park Heights alarms are sent to the same location as the City's Police Department.
Police department has personnel at this building 24 hours a day. In the event of an emergency, the police
department will contact the appropriate City Personnel.
Sensors
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Water system sensors and detectors are important for recognizing and correcting emergency situations.
' Pressure transducers and limit switches should be checked and calibrated regularly.
' Security
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The safety of a water supply and distribution system is critical to any community, and acts of vandalism
or terrorism should never be allowed to compromise this valuable resource. A security system including
the use of electronic keys or some similar device could be implemented to control access to water system
facilities.
Currently all entrances to facilities are kept locked. Keys to entrances are provided only to
operators /maintenance personnel.
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Operation and Maintenance Manuals
Operation and maintenance manuals are conveniently located throughout system facilities so as to
provide the public works staff with accessible instructions in case of an emergency.
Replacement Parts
An adequate supply of replacement parts are stored at the water utility facilities as recommended by the
manufacturers of the equipment in case of an emergency.
Emergency Response Procedures
Water Quality
Water quality problems occur due to difficulties that can not be managed by the normal treatment
process of the system. Difficulties that might be encountered include source contamination, a stoppage
of treatment, or contamination of the distribution system. An extensive monitoring program will enable
operators to detect contamination in the distribution system. Unfortunately, it takes as long as several
days for the necessary data to be generated in a laboratory. When the origin of the water contamination
is unknown, each phase of the water supply system should be inspected for possible problems.
When there is reason to believe that the water supply has been contaminated, customers and health
authorities will be contacted without delay. Informing the customers of the emergency is especially
important, as they should be instructed regarding the appropriate precautions to take.
Recommendation: Update the chlorination equipment in the pump houses so that it is available in
an emergency.
Water Supply Plan
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Table 12 Well and Water Quality Data
(I) Expressed as CaCO, to convert to grains per gallon, multiply by .0584.
Storms
' Water Supply Plan 35
Well #1
Well #2
Unique Well No.
208794
112205
Year Installed
1968
1975
Aquifer
Jordan
Jordan
Casing Depth, ft.
230
230
Total Depth, ft.
310
291
Casing Diameter, in.
16
16
Static Water Level, ft.
137
128
Drawdown, ft.
7
37
Peak Demand Capacity, gpm
850
850
Pump HP/Type
VT
VT
WATER QUALITY
Results
Well #1
Well #2
Secondary
Standards
Date of Test
4/85
4/85
pH
N/A
7.5
6.5-8.5
Alkalinity, mgll (1)
210
190
Total Hardness, mg/1 a/
220
200
150
Hard
Chloride, mg/I
4.9
3.8
250
Iron, mg/1
<0.01
<0.05
.3
Calcium, mg/1
160
120
Manganese, mg/I
0.04
0.02
.05
Magnesium, mg/1
60
75
Total Solids m
230
220
500
(I) Expressed as CaCO, to convert to grains per gallon, multiply by .0584.
Storms
' Water Supply Plan 35
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' Storms
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The effect of storms on water facilities are typically fires, flooding, power outage or lightning
damage to equipment. Structural damage to towers and buildings may also occur depending upon
the type of storm.
In the event of a power outage, storm damage or lightning damage to equipment, the City will:
1. Determine available storage volume.
2. Contact Northern States Power Company and get an estimated time for power restoration.
3. Assess damage to controls and sensing equipments.
Depending on the outcome of steps one and two, Oak Park Heights will take the following measures:
• obtain an alternative emergency power source
• notify fire department
• operate system manually if necessary
' Droughts
Monitoring of the weather can enable one to predict the possibility of a drought occurring. During
drought periods, tower and well levels will be monitored daily. The monitored information will be
used to help determine whether any triggers have been reached. Furthermore, it is necessary to have
emergency plans for limiting water consumption that can be implemented without delay.
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Personnel
In any emergency, it is necessary for the utilities staff to know their respective duties in resolving
the crisis. At the City, all certified water utility operators are trained in emergency procedures. In
addition, it is the City's policy that all operators should attend continuing education on emergency
procedures. In the future, an emergency duty description manual may be developed to clearly
communicate specific emergency procedures to the employees.
Wafer Supply Plan 36
1 1%41 UV-1 NVV PUnNF TdiT1%4RTlWDQ
LIl,1Ya_ V Yl
DNR Permit No 75 -6123
Oak Park Heights Water Utility Staff - First Contact
Not included in this document for privacy reasons. Telephone lists of key personnel are kept in city
water facilities.
Excavation, Water Main Repair
Pete Miller, Miller Contracting ...................... 457 -7870
Well Repair
E.H. Renner& Sons ........ ........................427 -6100
Power Outages
Northern States Power ............................. 221 -4411
Chlorine/Sulphur Dioxide Leak
Feed Rite ................ .......................331 -9100
Oak Park Heights Fire Department ................... 911
Water Ouality Problems
Department of Natural Resources, Jim Japs ............ 297 -2835
Pollution Control Agency .......................... 296 -6300 (General Information)
Minnesota Department of Health ..................... 623 -5000 (General Information)
Water Supply Plan
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Emergency Reporting Information
Oak Park Heights Utility
Use this form to report an emergency that appears to involve water service. Immediately contact the
Public Works Department. Emergency telephone numbers are attached to this form.
1. Person reporting emergency Phone no. Time report was
received Date report was received
2. Location of emergency
Street and houselbuilding number
Other (approximate location, distance from landmark, etc.)
3. Condition at scene [check appropriate box(es)]
• Escaping Water O Seepage O Free - flowing
0 Gushing
• Flooding 0 Roads 0 Intersections
0 Property 0 Buildings
• Erosion 0 Banks 0 Foundations
• Electrical Power 0 Interruptions
• Total loss of power
• Change in Water Quality 0 Taste 0 Odor
• Color 0 Clearness
4. Briefly describe the situation, citing any actual or potential damage.
5. Access restrictions, if any
6. Assistance already available (who, what are they doing, etc.)
7. Other comments
Signature of Person Who Filled Out Form
*For use by personnel likely to see or become involved in water system emergencies.
Water Supply Plan
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Water Conservation Plan
Role of Conservation
The water conservation plan for the City of Oak Park Heights is intended to reduce the demand for
water, improve the efficiency of water use, and reduce loss and waste of water. Conservation is an
alternative to developing additional sources of water to meet peak demands for non - essential uses
of water. Reducing the peak use of water will delay or reduce additional source development and
water storage requirements.
The City's conservation goal is to keep total per water use at or below 137 gpcd. The City has also
adopted the conservation goal of keeping the average day to maximum day ratio below 3.
Demand reduction programs will target uses associated with peak demands, such as outdoor water
practices. By reducing the amount of water used for watering lawns and plants, Oak Park Heights
intends to reduce peak demand and maintain the reduced demand over the next planning period.
Specific program initiatives will be provided in more detail under the heading Water Conservation
Programs.
Future revisions of this report should adjust projected water demands based on the results of the
City's conservation plan. The City's conservation plan will be continuously evaluated and compared
to previous years to measure the success of the programs.
Water Conservation Potential
The City of Oak Park Heights is an established community with a growing population base. The
overall demand on the water system has increased 42% since 1985. In communities with growing
population bases and planned system expansions, water conservation can play an important role in
the management of water resources. Adopting water efficient practices as a part of the City's Best
Management Practices may delay the development of additional wells as well as expansion to
wastewater treatment facilities.
Water Supply Plan 39
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' Oak Park Heights's water system is in excellent repair. Therefore., the focus of the water
conservation plan in the future will be on continuing the wise use of water, maintaining the present
condition of the water system, and making repairs to the original distribution and supply areas as
required. Through enforcing building codes, the City can ensure the retrofit of aging water fixtures
with water efficient fixtures. The following is a discussion of water conservation potential for each
of the areas addressed in the Water Supply Plan as well as conservation potential for the various
customer classes.
I Per Capita Water Use
Per capita water use information is beneficial because it shows who is using the water and how much
water they are using on average. Oak Park Heights's total per capita water use averages 128.6
gallons per capita per day (gpcd). Table 4 shows that both total and residential per capita use has
remained fairly stable over the last eight years. The City will work with customers in an effort to
keep the per capita use low.
The residential sector will see some decrease in their gallons per capita per day over the next decade
due to the replacement of high water using fixtures that will occur due to the passage of the 1992
Federal Energy Policy Act.
The total gallons per capita per day is highly dependent upon commercial/industrial development.
The goals described in this plan are realistic.
Water Demand by Customer Category
Residential Customers
Oak Park Heights is in the process of planning for the anticipated growth in the residential sector due
to the growth in new home construction. Clearly it may be appropriate to create conservation
programs that target customer categories. Although the residential sector comprises approximately
90% of the connections, the City estimates that residents consume about 50% of the total water
t pumped each year.
For residential customers, the greatest potential for water savings in the residential sector is in
outdoor watering practices and efficient indoor use. Utilizing water efficient practices would reduce
the total water pumped annually as well as decrease some of the peak demand periods.
Water Supply Plan 40
CommerciaU[nstitutional Customers
The commercial/institutional sector makes up approximately 10% of the total connections. Public
facilities such as the MN Correctional Facility or Washington County are good candidates for water
conservation programs because they benefit from the cost savings derived by using less water.
Private business usually benefits from conservation programs if there is sufficient payback potential.
It is difficult to target conservation programs toward commercial users because their uses are usually
industry specific. For instance, a car wash is going to use large amounts of water. If the payback
is sufficient for the owner to invest in technology for recycling water, the owner will usually
undertake the improvement. For businesses, the payback needs to be there in order to justify the
upgrade. Therefore, water conservation efforts for commercial/institutional customers will focus on
plumbing retrofits in public buildings and education.
1. Plumbing Retrofits. Most larger public buildings are equipped with commercial toilets that utilize
a Sloan valve for flushing. Most of the toilets use approximately 4.5 gallons per flush. There are
retrofit kits available that save one gallon per flush. The public facilities' management should
consider replacing the valves with a retrofit kit as a part of the normal maintenance. The valves
will conserve water and do not compromise waste removal.
For buildings that do not have commercial toilets, toilets should be tested on a regular basis for
leaks and repaired when detected. Larger use toilets should be replaced with 1.6 gallon toilets
over a period of time.
2. The City will include education initiatives for business owners and provide them with resources
to seek out about water conservation potential.
Industrial Customers
Oak Park Heights does not have any industrial customers. Oak Park Heights is not seeking industrial
customers that use large amounts of water. All customers will be encouraged to adopt water efficient
technologies as a part of their operations.
Unaccounted for Water Use
The average unaccounted for water use was 13% over the last eight years. There is a good potential
to get the unaccounted for water below 10% by metering and better accounting of estimated uses for
flushing, etc.
Water Supply Plan 41
Seasonal and Peak Water Demands
The greatest potential for water conservation in Oak Park Heights is on seasonal and peak water
demands. Although peak periods, these peaks place an enormous amount of stress on the system.
Through an appropriately targeted water conservation program, Oak Park Heights intends to reduce
the peak demand periods.
Water Conservation Programs
Formal water conservation planning is a relatively new concept for many water utilities, and the City
of Oak Park Heights is no exception. The City of Oak Park Heights has adopted policies that
encourage conservation such as uniform water rates, metering of customers, and high water rates
sprinkling restrictions.
The challenge for conservation program development is targeting uses that can be reduced through
physical change (toilet retrofits) and habitual change (using a broom, not water to clean sidewalks
and driveways). These changes can be encouraged through a number of different water conservation
programs such as education initiatives, retrofit programs and rebates.
The key for effective water conservation programs in Oak Park Heights is planning. As Oak Park
Heights's population grows, so will the demand for drinking water and wastewater treatment
services. Through appropriate water conservation measures, capital expenditures for increased
demands can be delayed or reduced, which is a large financial saving for the community.
Successful water conservation programs have specific goal and objectives. The plan should ensure
that the payback is sufficient, it is easy to administer, funding is secured, and most importantly that
it actually conserves water over the long -term.
The following is a discussion of current conservation measures and conservation recommendation
for the citizen task force to evaluate:
1. Metering: All current and future water users are and will be metered. All large meters are
being repaired or replaced based on AWWA recommendations.
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Implementation Plan: In 1997, the City Engineer and Water Operator will establish a
program for meter calibration and repair. This program will include large meters (at
pumphouses), residential, meters, and commercial accounts.
Water Audits, Leak Detection and Repair: Unaccounted -for water is the difference
between the volume of water sold and the volume of water withdrawn from the source.
Unaccounted for water use (listed in Table 4 as "Other ") has averaged 12 percent from 1988
to 1995. As Oak Park Heights's system ages, the City will continue to maintain the system
and promptly repair leaks. The City will continue to monitor these losses and work to ensure
that they are able to maintain their unaccounted for water loss at less than 10%.
Maintaining annual records of the unaccounted -for water allows the City to monitor the
condition of the water system. As the system continues to age, the City will need to spend
more money on leak detection, maintenance and repair. The rate structure needs to include
these future costs. Rates are discussed in more detail in the next section.
Oak Park Heights currently offers water audits to customers who experience a large increase
over the past billing period. Meters are checked to for leaks and utility staff offers advice
about leak detection and repair.
Implementation Plan: The Water Operator will continue to monitor these losses and work
to ensure that they are able to maintain their unaccounted for water loss at less than 10%.
The plan will be re- evaluated after the large water metes are calibrated.
The Water Operator, City Engineer, and Billing Department will meet in 1997 to establish
a strategy to improve the billing system. Issues to evaluate include: providing water audits
for large- volume users who experience a large increase over the past billing period, home
water audits, and determining the best definition of customer categories.
3. Conservation - Oriented Water Rates: The City currently uses a uniform rate system and
bills its customers quarterly. A uniform rate (same cost per gallon regardless of use) has
been shown to be an effective conservation measure. On the quarterly billing, customers are
charged for each 1000 gallons consumed over 15,000 gallons.
Minimum Fee (up to 15,000 gallons) $ 18.30
Water Rate (per 1000 gal thereafter) $ .95
Water Supply Plan 43
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including maintenance. Future capital expenditures will be financed through connection
charges and assessments.
Implementation Plan: The City will consider alternative rate systems such as increasing
block rates, summer surcharges and a hybrid structure. They will also consider adopting a
small surcharge to fund conservation initiatives.
4. Regulation: The City relies on the following regulations to provide short-term demand
reduction and long -term improvements in water use efficiencies.
Implementation Plan: In 1997, the City will focus its efforts on education material that is
targeted toward user groups and user practices. The City will evaluate the cost of the
program as well. The City should consider the following education foci:
1. Education targeted to the public on the benefits of water conservation, focusing on habits
and efficient uses of water (this could tie in with the home audit information i.e. how to
check for leaking fixtures, water efficient fixtures, etc.).
2. Education targeted toward developers, focusing on water efficient plantings for new
developments.
3. Education focused toward commercial users, providing them with resources to contact
for water efficient technologies.
Water Supply Plan 44
A. State and Federal Plumbing Codes: All new homes and retrofits of existing homes will
have water efficient fixtures.
Plan.
B. Short-term Reduction Procedures: Described in the Emergency Preparedness
the
Implementation Plan: The Water Utility Superintendent will evaluate effectiveness
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of the new water use restrictions and make recommendations for improvements.
5. Education and Information Programs: Oak Park Heights is committed to making a strong
effort to educate the public on the benefits of water conservation.
Implementation Plan: In 1997, the City will focus its efforts on education material that is
targeted toward user groups and user practices. The City will evaluate the cost of the
program as well. The City should consider the following education foci:
1. Education targeted to the public on the benefits of water conservation, focusing on habits
and efficient uses of water (this could tie in with the home audit information i.e. how to
check for leaking fixtures, water efficient fixtures, etc.).
2. Education targeted toward developers, focusing on water efficient plantings for new
developments.
3. Education focused toward commercial users, providing them with resources to contact
for water efficient technologies.
Water Supply Plan 44
6. Retrofitting Programs: The City Building Inspector will enforce the existing plumbing
codes relating to retrofitting existing water fixtures. As the gallons per capita per day are
low, the City will not pursue a mandated retrofit program for the residential sector. The
payback for a residential program would be too long to justify the cost. With the enactment
of the 1992 Federal Energy Policy Act, all fixtures available for replacement are water
savers. As homeowners gradually begin to replace aging fixtures or remodel their homes, the
high user fixtures will be replaced by water saving fixtures. The payback for a residential
customer will demand upon fixture use and home water habits. If the residential gallons per
capita dramatically increases and it appears that there may be a good savings potential for
a city wide retrofit program, the City will revisit the possibility of funding a retrofit program
at that time.
Implementation Plan: The City will contact Minnesota Corrections Facility and
Washington County in 1997 to discuss water conservation. Retrofit programs makes sense
for public buildings provided it is a part of the maintenance program, or regular replacement
schedule of parts. Gradually, all higher use fixtures will be replaced with lower consumption
fixtures, and because the change out will occur as older parts need replacing, there should
not be much of a financial on the public buildings' budgets.
1. Water sensors for residential, commercial and industrial sprinkling systems should be
evaluated -- what the payback is, etc.
2. Evaluate the viability of a retrofit program if per capita use warrants it.
' 7. Pressure Reduction: The City water system has been designed to ensure that static and
residual pressures in the water service area are maintained at an average of between 40 psi
and 90 psi. Users with pressures above 90 psi will be required to install individual pressure
reducing valves at the point of service, unless special needs dictate. There are currently no
customer that have needed to installed pressure reducing valves in their homes. The only
method available to the City to reduce pressures in an emergency is to lower the water level
in the water towers. This procedure is unacceptable resulting in reductions of available fire
I protection.
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Water Supply Plan
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Appendix A
Water Related City Ordinance
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1001
REGULATION OF THE USE OF WATER AND SEWER
AN ORDINANCE RELATING TO AND REGULATING THE USE OF WATER AND
SEWER IN THE CITY OF OAF PARR HEIGHTS ESTABLISHING RULES AND
REGULATIONS FOR THE ADMINISTRATION OF THE WATER AND SEWER SYSTEMS
' IN THE CITY AND MATTERS RELATING THERETO, INCLUDING ALL
PROPERTIES, MAINS, RATES AND CHARGES IN CONNECTION THEREWITH AND
ESTABLISHING AN INDUSTRIAL USER STRENGTH CHARGE IN ADDITION TO
THE CHARGE BASED UPON THE VOLUME OF DISCHARGE BY AN INDUSTRIAL
USER AND ESTABLISHING TAX LIEN AGAINST PROPERTY SERVED IN
CONNECTION WITH SUCH STRENGTH CHARGE AND SEWER AND WATER RULES
AND REGULATIONS AND REPEALING ORDINANCES IN CONFLICT THEREWITH.
THE CITY COUNCIL OF THE CITY OF OAK PARR HEIGHTS, WASHINGTON
COUNTY, MINNESOTA, DOES ORDAIN:
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1001.01 Establishment of Department
Public Utilities Division
There is hereby established a
of the Department of Public Works of the City of Oak
Park Heights which shall be under the supervision of
the Director of Public Works. The water and sewer
systems as they are now constituted or shall hereafter
be enlarged or extended shall be operated and
maintained under the provisions of this ordinance
subject to the authority of the City Council at any
time to amend, alter, change or repeal the same. The
City Council shall have responsibility for the
1
management, maintenance, care and operation of the
sewer and water systems of the City subject to the
delegation of such authority to City employees,
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individual Council members, or the City Clerk as the
Council shall make from time to time.
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1001.02 Applications, Permits and Fees
type of
No person, firm or corporation shall make any
connection to the water system, sanitary sewer system
or storm sewer system except upon making an application
therefore on a form provided by the City and receiving
a permit issued by the City and for such purposes. The
application shall include the legal description of the
property to be served, the uses for which the
connection is requested, and the size of the service
Line to be used. At the time of making such
application there shall be paid to the City Clerk fees
which shall be set by the City Council from time to
time by resolution for the following purposes:
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A. No connection shall be made with respect to any
sanitary sewer, water system or storm sewer system
serving the property of any person or occupants of
the land, parcel or premises affected that have
not paid or provided for the payment of the-full
and proportionate share of the said utilities
which share shall be payable as follows:
1. No connection shall be made to the City water
or sewer system until the applicant or owner
pays a connection charge as established by
Council resolution from time to time. The
connection fee shall be in addition to any
fees or charges required under subsections 2,
3 & 4.
2. For services to property to which service
lines have not been previously run from the
street laterals to the property line, the
owner, occupant, or user shall pay into the
City Treasury a service line charge, the
amount of which shall not be less than the
City's cost of making the necessary
connections, taps, and installation of pipe
and appurtenances to provide service to the
property and the necessary street repairs,
provided, however, with the approval of the
City, the owner or applicant shall have the
right to contract directly with a registered
installer for the installation and connection
of the service ling.
3. Prior to any connections the owner, occupant
or user shall pay in cash or agree to pay
charges in the Form of Special Assessments to
be levied against the property to be spread
over a number of years coincident with the
maturity requirements of any Special
Improvement Bonds sold for the purpose of
financing the construction of sanitary sewer,
municipal water or storm sewer system serving
the property. Said cash payment of
assessment charge shall be in the Principal
amount of not less than the payments made by
or charges placed against comparable
properties for like services for such
sanitary sewer, water or storm sewer system
in an amount as may be established by the
City Council. Payment to the City Treasury
in the form of a special Assessment charge
shall be in the form of equal annual
installments together with interest on the
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The Plumbing Inspector shall examine all
applications before construction is begun, and
after construction, enlargement, alteration or
' repair is complete, the Plumbing Inspector shall
be notified. It shall be unlawful to cover any
connecting line until an inspection has been made
V • and such connection and the work incident thereto
has been approved by the City as a proper and
suitable connection.
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A.
Before any
t unpaid
balance, which shall be established by
water system shall be used or utilized on the land
Council resolution.
4. The City Council may establish water,
sanitary sewer and storm sewer districts and
there shall first be installed a water meter that
establish area charges, connection charges
and lateral charges for each said district by
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Council resolution.
premises, except and unless such installation
9. Before, proceeding with the construction,
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enlargement, alteration, repair of any water or
sewer'lines connecting the water system, sanitary
All applications for the installation, maintenance
sewer system or storm sewer system to any house or
building, the owner or his agent shall first
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obtain a permit for such purposes from the
application within a reasonable time thereafter.
municipality through its City Clerk.
The applicant shall pay to the City Clerk a permit
fee the amount of which shall be established from
City and shall remain the property of the City of
time to time by Council resolution.
The Plumbing Inspector shall examine all
applications before construction is begun, and
after construction, enlargement, alteration or
' repair is complete, the Plumbing Inspector shall
be notified. It shall be unlawful to cover any
connecting line until an inspection has been made
V • and such connection and the work incident thereto
has been approved by the City as a proper and
suitable connection.
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1001.03 Water
Meter Regulations
water through the municipal
A.
Before any
water system shall be used or utilized on the land
or premises of any person, firm or corporation,
there shall first be installed a water meter that
will accurately measure the water consumed on the
premises, except and unless such installation
shall be exempted by the City.
B.
All applications for the installation, maintenance
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and repair of water meters shall be made to the
City Clerk, who shall proceed to comply with such
application within a reasonable time thereafter.
All meters installed shall be furnished by the
City and shall remain the property of the City of
Oak Park Heights. Regulations for the cost of
furnishing and use of water meters shall be
established by Council resolution.
C.
ro person, firm or corporation other than the City
of Oak Park Heights or its designee, shall
install, and repair any water meter within the
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City limits. Every water meter connected to the
water system shall be sealed by or under the
direction of the City Clerk or City Department of
Public Works and no person, firm or corporation
shall break or remove such seal. whenever any
seal attached to a water meter by or under the
direction of the City Clerk or City Department of
Public works is found broken, the broken condition
of such seal was broken contrary to the terms and
provisions in violation of this ordinance.
All ripter meters connected to the water system
shall be accessable to the City Clerk or City
Department of Public Works or designee at any
reasonable hour of any business day and the
refusal of admission by any owner or occupant of
any premises wherein a water meter is installed
after such owner or occupant has been notified
that admission is desired for the purpose of
inspecting a water meter installed in said
premises shall constitute a violation of this
ordinance.
E.
Water meters shall be repaired or replaced from
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time to time as is necessary to insure accurate
measuring of the flow of water. The cost of said
repair or replacement shall be borne by the City
except that whenever a meter has been damaged due
to negligence on the part of persons other than
the employees of the City, the owner, occupant or
user of the premises or such other person desiring
the use of the water shall reimburse the City for
the expense of repairing or replacing any such
meter. Upon failure to reimburse the City within
a reasonable time and upon demand therefor, the
water service and supply to said premises may be
shut off or discontinued as determined to be in
the best interest of the City.
F.
It shall be unlawful for any person to tamper
with, alter, by -pass or in any manner whatsoever
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interfere with the proper use and functioning of
any water meter :within the City.
G.
If a meter fails to register or accurately measure
the water, the charge for water consumed shall be
paid for at the established rate based upon past
average billings as determined by the City Clerk.
H.
Whenever a water user questions the accuracy of
the meter, and desires that his meter be tested,
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he shall pay a fee the amount of which shall be
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establkshed from time to time by Council
i resolution, to have the meter tested. Lf the
meter. is accurate within a range of minus 3
percent to plus 1 1/2 percent, no charge will be
made i1or testing and an adjustment on the water
bill will be made for the period of time that the
■ meter is assumed to be inaccurate, not to exceed
two (2) billing periods.
1001.04 Meter Readings
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A. The City Council may provide a system of water
meter reading by post card, meter person, or any
other `method deemed suitable to the purpose by
Counciil. The Council may also establish billing
areas districts and provide for the reading of
metersiand billing charges by calendar quarters or
monthl.y or such periodic intervals as the City
Councial shall determine suitable and necessary
from 'time to time by resolution; provided,
however, where meter reading is done by post card
the City Council may establish a penalty for
failure to return water meter reading card within
the time designated on said card by Council
resolution.
B. The City reserves the right to discontinue service
to any customer of the water and sanitary sewer
system without notice when necessary for repairs,
additional connection or re- connection.
The City reserves the right to discontinue service
to env custcmer of water and sanitary sewer system
- ,;Lth notice as hereinafter provided for non-
payment of charges or bills or for disregard of
any rules or regulations in connection with the
use or operation of said system. The service of
water or sanitary sewer shall not be shut off
until notice and an opportunity for a hearing have
first been given to the occupant and owner of the
premises involved. The notice shall be personally
served and shall state that, if payment is not
made before the date stated in the notice, but not
less than ten days after the date upon which the
notice is given, the water supply to the premises
will be shut off. The notice shall also state
that the occupant may, before such date, demand a
hearing before the Cit:: Council, in which case the
supply will not be shut off until - after the
hearing is held. If, as a result of the hearing,
the City Council finds that the amount claimed
owing is actually due and unpaid and that there is
no legal reason why the water supply of the
I delinquent
customer may not be shut off in
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C. In the event a water or sewer bill, whether
incurred prior or subsequent to the passage of
this ordinance, is unpaid after the due date as
established by Council resolution from time to
time, the bill shall be considered delinquent and
the service may be discontinued as provided in (B)
above and the City Council may cause the charges
noted in such billing to become a lien against the
property served by certifying to the County
Auditor the amount of said delinquent bill in
accordance with the statutes of the State of
Minnesota. Such action is optional and may be
subsecuent to taking Legal action to collect
delinquent accounts.
1001.05 Liability for Repairs
After the initial connection has been made to the curb
stop or the sewer lead the applicant, owner or the
occupant or user of such premises shall be liable for
all repairs required to any water line or any sanitary
or storm sewer lines necessary for connection of the
premises to the street main, including any repairs
necessary to the curb stop box and any necessary street
repairs; it shall be the responsibility of the
applicant, owner, occupant or user to maintain the stop
box at such height as will insure that it remains at
the finished grade of the land or property
A. In the event a water main becomes frozen, the City
of Oast Park Heights will be responsible for
thawing the same. The property owner shall have
the sole responsibility of thawing frozen water
service line from its connection to the street
main into the premises. All contractors engaged
in thawing water lines must comply with the
provisions of ordinance 302, Contractors Permits.
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accordance with this ordinance, the
City may then
shut off the supply.
Whenever any service has been discontinued
for
non - payment of charges or bills or
for disregard
of any rules or regulations in accordance with the
procedures set forth above, it
shall not be
resumed except upon payment of
the charges or
bills accrued together with interest
thereon, at a
rate to be determined by Council
resolution from
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time to time or compliance with
the rules and
to the
regulations previously violated and
payment
City of restoration fee, the amount
of which shall
be set by the City Council from
time to time by
resolution.
C. In the event a water or sewer bill, whether
incurred prior or subsequent to the passage of
this ordinance, is unpaid after the due date as
established by Council resolution from time to
time, the bill shall be considered delinquent and
the service may be discontinued as provided in (B)
above and the City Council may cause the charges
noted in such billing to become a lien against the
property served by certifying to the County
Auditor the amount of said delinquent bill in
accordance with the statutes of the State of
Minnesota. Such action is optional and may be
subsecuent to taking Legal action to collect
delinquent accounts.
1001.05 Liability for Repairs
After the initial connection has been made to the curb
stop or the sewer lead the applicant, owner or the
occupant or user of such premises shall be liable for
all repairs required to any water line or any sanitary
or storm sewer lines necessary for connection of the
premises to the street main, including any repairs
necessary to the curb stop box and any necessary street
repairs; it shall be the responsibility of the
applicant, owner, occupant or user to maintain the stop
box at such height as will insure that it remains at
the finished grade of the land or property
A. In the event a water main becomes frozen, the City
of Oast Park Heights will be responsible for
thawing the same. The property owner shall have
the sole responsibility of thawing frozen water
service line from its connection to the street
main into the premises. All contractors engaged
in thawing water lines must comply with the
provisions of ordinance 302, Contractors Permits.
6
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No water customer shall be given a credit on a
water bill for allowing water to run to prevent
freezing without specific prior authorization from
the Council annually.
1001.06 implied Consent to Rules Regulatio and Rates.
Every person applying for water or sewer service, every
owner of property for which any such application is
made, every person accepting water or sewer service and
every owner of property whera such service is accepted
subsequent to the passage of this ordinance shall be
deemed upon making such application or accepting such
service to consent to all rules, regulations and rates
as established by this ordinance and as may hereafter
be set forth and adopted by the City Council by
resolution or ordinance.
1001.07 Billing Regulations
The City Coui shall have the authority to prescribe
by resolution the rates to be charged for water and
sewer service to the customer from time to time and may
prescribe the date of billing, a discount for payment
within a prescribed period and /or penalty for failure
to pay within such period and such further rules and
regulations relative to the use and operation of such
systems as it may deem necessary from time to time.
The owner shall be liable for water supplies to his
property whether he is occupying the property or not
and any unpaid charges shall be a lien upon the
property.
1001.08 Emergency Regulations
The City Council may impose emergency regulations
pertaining to the conservation of water by resolution
of the City Council and by giving notice by publication
or by posting in the City Hall and at such public
places as the Council may direct.
whenever the City Council determines that a shortage of
water supply threatens the City, it :nay, by resolution,
limit the times and hours during which Cit:: water may
be used for sprinkling, irrigation, car washing, and
other external purposes. After publication of a Notice
setting forth the restrictions for use of water for
said purposes or two days after mailing a copy of such
Notice to each customer, no person shall use or permit
water to be used in violation of the resolution and any
customer who does so, shall be charged such sum as
established by resolution for each day of violation and
the charge shall be added to the customer's next water
bill. Continued violation shall be cause for
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1001.10
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discontinuance of water service.
C. 110 ocx
Leak in Serivice Line
Any owner,occupant or user of a premises who shall
discover a _ leak in a service line to the premises shall
notify the 'City Office within twenty -four (24) hours.
Any water�7 wasted due to failure of such person to
comply with this regulation shall be estimated by the
City Clerk -:and be charged for against the owner of such
premises ati the established rssm+.
Installation of Connections.
All connections to the water system, sanitary sewer
system shall be performed by a registered installer
licensed to do plumbing in the City of Oak Park
Heights; e4cept that nothing in this ordinance shall be
construed as to prohibit an individual owner from
obtaining a permit to connect to an existing service
line located totally within the owner's property and
installing such connection by his own labor provided,
however, that said construction is conducted under the
regulations of this ordinance and all other City
Ordinances; and applicable Statues of the State of
Minnesota 'and requirements of the City Engineer and
City Plumbing Inspector.
1001.11 City No Liable
t
The City shall not be held liable at any time for any
deficiency or failure in the supply of water to the
customer whether the same be occasioned by shutting off
the water 'or repairs or connections or for anv cause
whatever.
1001.12 Right to Enter Land
The City of oak. Park Heights by any authorized employee
or agent shall have the right to enter and be admitted
to any lands and property in the City at any reasonable
hour for the purpose of inspection of materials,
plumbing work and fixtures of all kinds used by or in
connection with the water and sewer systems.
1001.13 Priva water not Permitted in Ci System.
Whenever any premises are connected to the Ci_y water
system, there shall be maintained a complete physical
separation between the City water supply system and the
private water supply system so that it is impossible to
intentionally or unintentionally allow any water
produced by a private system to be introduced in the
supply line from the City system.
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AM%+ 1001.14 Storm Water not Permitted in Sanitar Sewer System.
It s all be unlawful for any owner, occupant or use
of
any premises to direct into or allow any storm water,
surface water, ground water, well water or water from
air conditioning systems to drain into the sanitary
sewer system o! the City of Oak park Heights. No rain
spout, or other form of surface drainage and no
foundation drainage or sump pump shall be connected or
discharged into any sanitary sewer.
1001.15 Delayed Connection Charge
Any owner of a residence or commercial building to
' which water and sewer service is or becomes available
shall be sublet to an additional charge as established
by Council resolution from time to time upon connection
to such service if such connection is not made within
1 the period of time which shall be established by
Council resolution after such services become
available.
1001.16 Prohibited Wastes into Sanitary Sewer Sy stem.
A. waste Discharge Regulations:
No person, firm or corporation shall discharge any
waste, or cause or allow any waste to be
discharged into the sanitary sewer system unless
in accordance with the following regulations:
1. Treatment of prohibited waste.
any waste
Where it is determined that
discharged or to be discharged has certain
c' ^aracteristics or elements which are or may
'
oe harmful to the structures, processes or
operation of the sanitary sewer system or
persons operating it, such discharge shall be
discontinued or that the waste shall be
treated prior to its discharce into the
system in a manner which will eliminate such
characteristics or elements.
3 Limitations on Discharge.
o person., firm or corporation shall
discharge Dr cause, or allow to be discharged
into the sanitary sewer system any waste
containing concentrations in excess of the
fz�Llowing:
Concentration
Chromium (total) 25.0 mg /I
10 ,0 g l
Chromium (hexavalent)
m
Copper g /
Cyanide (total) 10.0 mg /l
Cyanide (readily released at 150 degre?s
and pH = 4.5) /1
9
B. Liquids, solids, or gases which by
reason of their nature or quantity are
or may be sufficient to cause fire or
explosion or be injurious in any other
way to the sanitary sewer system or to
the operation of the system. At no time
shall two (2) successive readings on an
erplosimeter, at the point of discharge
into the sewer system, be more than five
percent (5 %) nor any single reading over
ten percent (10 %) of the Lower Explosive
Limit (L.E.L.)
C. Any noxious or malodorous solids,
liquids or gases, which either singly or
by interaction with other wastes, are
capable o creating a public nuisance or
hazard to like, or are or may be
sufficient to prevent entry into a sewer
for its maintenance and repair.
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Iron 50.0 mg /l
Lead 0.5 mg /l
Mercury None at levels
acutely toxic to
humans or other plant
or animal life
Nickel 10.0 mg /l
Zinc 15.0 mg /l
Temperature (except where higher
temperatures are required not over
by law) 150 Deg. F
p g 5.5
3. exclusion of Wastes.
No person, firm or corporation shall
discharge or cause or allow to be discharged
into the sanitary sewer system any waste
j which
contains any of the following:
A. More than one hundred (100) mg /l of
fats, wax, grease or oils (hexana
soluble), whether emulsified or not, or
containing substances which may solidify
or become viscous at temperatures
between 32 degrees and 150 degrees F (0
degree and 65 degrees C) at the point of
discharge into the sewer system.
B. Liquids, solids, or gases which by
reason of their nature or quantity are
or may be sufficient to cause fire or
explosion or be injurious in any other
way to the sanitary sewer system or to
the operation of the system. At no time
shall two (2) successive readings on an
erplosimeter, at the point of discharge
into the sewer system, be more than five
percent (5 %) nor any single reading over
ten percent (10 %) of the Lower Explosive
Limit (L.E.L.)
C. Any noxious or malodorous solids,
liquids or gases, which either singly or
by interaction with other wastes, are
capable o creating a public nuisance or
hazard to like, or are or may be
sufficient to prevent entry into a sewer
for its maintenance and repair.
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Any toxic substance, chemical elements
or compounds in quantities sufficient to
interfere with the biological processes
of efficiency of treatment works, or
that will pass through a treatment works
and cause the effluent therefrom or the
water into which it is discharged, to
fail to meet applicable State or Federal
Standards.
E. Garbage that has not been ground or
comminuted to such a degree that all
particles will be carried freely in
suspension under flow conditions
normally prevailing in public sewers,
with no particle greater than one -half
inch (1/2 ") in any dimension.
F.
Radioactive wastes or isotopes or such
half -life of concentrations that they
are in noncompliance with present or
future regulations issued by the
appropriate authority having control
over their use and which will or may
cause damage or hazards to the system or
personnel operating it.
G.
Solid or viscous wastes which will or
may cause obstruction to the flow in a
sewer, or other interference with the
proper operation of any disposal system,
such as grease, uncomminuted garbage,
animal guts or tissues, paunch manure,
bones, hair hides or fleshings,
entrails, whole blood, feathers, ashes,
cinders, sand, spent lime, stone or
marble dust, metal, glass, straw,
shavings, grass clippings, rags, spent
grains, spent hops, waste paper, wood,
plastic, gas tar, asphalt, residues from
refining or processing of fuel or
lubricating oil, gasoline, naphtha, and
similar substances.
H.
Any waste from septic tanks or similar
facilities.
I.
Any mineral acids, waste acid pickling
or plating liquors from the pickling or
plating of iron, steel, brass, copper or
chromium, or any other dissolved or
solid substances which will or may
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endanger
health or
safety,
or attach or
dissolved solids.
corrode
any part
of the
sanitary sewer
system.
five (5) times the average daily
concentration of flow during normal
operation.
J. Liquids
or vapors
having
a temperature
higher
than 150
degrees
F immediately
prior to discharge into the sewer
system.
' K. Phenols or other taste or odor producing
substances in concentrations which will
or may cause the effluent from the
treatment works or the water into which
' it is discharged to fail to meet
applicable State or Federal standards.
'
L. Materials which exert or cause.
1) Unusually high concentrations of
inert suspended solids or of
dissolved solids.
2) Excessive discoloration.
3) Unusually high volume of flow or
concentration of waste exceeding
five (5) times the average daily
concentration of flow during normal
operation.
M. Unusually high concentrations of
'
suspended solids, BCD, COD, or chlorine
requirements, in such quantities as to
ccn.stitute a significant load on the
treatment works.
N. Any substance which is not amenable to
treatment or reduction by the type of
sewage treatment processes employed to a
degree sufficient to permit the effluent
from the treatment works and the water
into which it is discharged to meet
applicable State and Federal standards.
1001.17 Recitals for Establ_shinc Industrial User Strength
Charge
The Metropolitan Waste Control Commission, a
metropolitan commission organized and existing under
the laws of the State of Minnesota, hereinafter
referred to as the "Commission ", in order to receive
and retain grants in compliance with the Federal Water
Pollution Control Act Amendments of 1972 and
regulations thereunder, hereinafter referred to as the
"Act ", has determined to impose an industrial user
sewer strength charge upon users of the Metropolitan
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1001.19 Establishment of Strength Charge Formul
For the purpose of computation of the Strength Charge
established by Section 1001.18 hereof, there is hereby
established, approved and adopted in compliance with
the act the same Strength Charge formula designated in
Resolution No. 76 -172, adopted by the governing body of
the Commission on June 15, 1976, such formula being
based upon pollution qualities and difficulty of
disposal c` the sewage produced through an evaluation
of pollution qualities and quantities in excess of an
annual average base and the proportionate costs of
operation and maintenance of waste treatment services
provided by the Commission. Said Metropolitan Waste
Control Commission Resolution 76 -172, adopted June 15,
1976, is hereby made an attachment "A" to this
ordinance.
if
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Disposal System as defined in Minnesota_ Statutes
24, to recover operation
Section 473.121, subdivision
and maintenance costs of treatment works attributable
to the strength of the discharge of industrial waste,
such sewer strength charge being in addition to the
charge based upon the volume of discharge. In order
for the City to pay such costs based upon strength of
'
industrial discharge and allocated to it each year by
the Commission, it is hereby found, determined and
declared to be necessary to establish sewer strength
charges and a formula for the computation thereof for
all industrial users receiving waste treatment services
within or served by the City. Furthermore, Minnesota
Statutes Section 444.075, subdivision 3, empowers the
'
City to make such sewer charge a charge against the
owner, lessee, occupant or all of them and certify
unpaid charges to the County Auditor as a tax lien
against the property served.
1001.18 Establishment of Strength Charges
For the purpose of paying the costs allocated to the
City each year by the Commission that are based upon
the strength of discharge of all industrial users
receiving waste treatment services within or served by
the City, there is hereby approved, adopted and
based upon
established, in addition to the sewer charge
the volume of discharge, a sewer charge upon each
'
person, company or corporation receiving waste
treatment services within or served by the City, based
upon strength of industrial waste discharged into the
sewer system of the City, hereinafter referred to as
the "Strengthz Charge"
1001.19 Establishment of Strength Charge Formul
For the purpose of computation of the Strength Charge
established by Section 1001.18 hereof, there is hereby
established, approved and adopted in compliance with
the act the same Strength Charge formula designated in
Resolution No. 76 -172, adopted by the governing body of
the Commission on June 15, 1976, such formula being
based upon pollution qualities and difficulty of
disposal c` the sewage produced through an evaluation
of pollution qualities and quantities in excess of an
annual average base and the proportionate costs of
operation and maintenance of waste treatment services
provided by the Commission. Said Metropolitan Waste
Control Commission Resolution 76 -172, adopted June 15,
1976, is hereby made an attachment "A" to this
ordinance.
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1001.20 Strength Charge Payment
It is hereby approved, adopted and established that the
' Strength Charge established by Section 1001.18 hereof,
shall be paid by each industrial user receiving waste
treatment services and subject thereto before the
twentieth (20th) day next succeeding the date of
billing thereof to such user by or on behalf of the
City, and such payment thereof shall be deemed to be
delinquent if not so paid to the billing entity before
such date. Furthermore, it is hereby established
approved and adopted that if such payment is not paid
before such date an industrial user shall pay interest
compounded monthly at the rate of two - thirds of one
percent (2/39) per month on the unpaid balance due.
1001.21 Establishment of Tax Lien
As provided by Minnesota Statutes, Section 444.975,
subdivision 3, it is hereby approved, adopted and
established that if payment of the Strength Charge
established by Section 1001.18 hereof, is not paid
before the sixtieth (50th) day next succeeding the date
of billing thereof to the industrial user by or on
behalf of the City, said delinquent sewer strength
charge, plus accrued interest established pursuant to
Section 1001.20 hereof, shall be deemed to be a charge
against the owner, lessee and occupant of the property
served, and the City or its agent shall certify such
unpaid delinquent balance to the County Auditor with
taxes against the property served for collection as
other taxes are collected; provided, however, that such
certification shall not preclude the City or its agent
from recovery of such delinquent sewer strength charge
and interest thereon under any other available remedy.
1001.22 Separability of Sections
In the event any provision of this ordinance shall be
held invalid or unenforceable by any court of competent
jurisdiction, such holding shall not invalidate or
render unenforceable any other provision hereof.
1001.23 Penaltv Provision
Any person who shall do or commit any act that is
forbidden by the provisions of this ordinance shall be
guilty of a misdemeanor and upon conviction thereof
shall be punished by a fine not to exceed Seven Hundred
Dollars (5700.00) or to be imprisoned in the County
Jail for a period not to exceed ninety days, or both.
1001.24
Effective Date
This ordinance shall be in full force and effect from
and after its passage and publication according to law.
14
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r4j .41 �J to It
Mayor
Passed by the City Council: March 10, 1980
Published: May 9, 1980
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RESOLUTION 91 -02 -
CITY OF OAK PARR HEIGHTS
WASHINGTON COUNTY, )IMMS0TA
A RE5OLL`T1OH ESTABLISHED PURSUANT TO
ORDINANCE 1001 AND MINNESOTA STATUTE 444.075
CREATING AND ESTABLISHING CONNECTION CHARGES FOR
THE CITY OF OAK PARK HEIGHTS
I._._
WHEREAS, Minnesota Statute 444.075, Subd. 5 establishes
the statutory authority allowing municipalities to establish
connection charges for the privilege of connecting the public
facilities owned, operated and maintained by municipal
corporations; and,
WHf:REAS, Ordinance 1000.01 at seq- o' the Code of
Ordinances of the City of Oak ?ark Heights establishes the
appropriate rules and regulations for use and connection to the
. AA: City's public facilities consisting of municipal water, sanitary
sewer and storm sewer systems; and,
WHEREAS, the existing core facilities created,
constructed, maintained and established within the City of Oak
Park Heights have been in large measurs financed and acquired for
the public good by use of connection charges to the City's public
facility systems within the Cit. and, more specifically, have
been particularly financed by developments within the corporate
boundaries of the Cite of Oak Park Heights as those corporate
boundaries existed prior to July 29, 1988; and,
WHEREAS, the lands existing within the corporate
boundaries of the City cf Oak Park Heights as those corporate
boundaries existed trior to July 29, 1988 are sutstantially
improved and should not be further burdened by the establishment
of a connection charge system that is over and above that which
currently exists for these areas of the City; and,
WHEREAS, the grow within the City of Oak Park Heights
and the demand and reed for additional public facilities (i.e.
municipal water, sanitary sewer and storm sewer) has grown to the
point where the City is in need of constructing an additional
water tank to serve the Citv of oak Park Heights and its
anticipated growth into areas annexed to the City of Oak Park
e � Heights on or after July 28, 1989; and,
WHERB.'4S, tte Cit Council for the City of Oak Park
' Heights finds that it is appropriate and reasonable to use
connectior, charges as a means cf financing turther water works
improvements and other public facilities improvements to serve
' L3,= 1 � 4 '9: L-i - F _Hf PFFF - E'i ?.HT- - J115:11EEP NO. 410
LP ��
new areas within the .City of Oak Park Heights which will need and
be connected to such municipal and public facility systems within
the future; and,
' WMMEAS, the. office of the City Engineer for the City of
Oak Park Heights has completed a study dated October 10, 1989,
computing the need for additional connection charges within areas
' annexed to the City of oak Park Heights after July 29, 1989, and
anticipated to be annexed to the City of Oak Park Heights in the
future; and,
' WHFMEAS, the office of the City Auditor for the City of
Oak Park Heights has further reviewed said study and concurs with
the findings and projections of the City Engineer made within the
' aforesaid report from Bonestroo, knderlik & Associates dated
October 10, 1929; and,
' WHEREAS, the City Ccunc:! for the Cit? of Oak Park
Heights has received requests from property owners to extend
municipal services and public facilities into newly annexed areas
within the City of Oak Park Heights which create the need for
additional public facilities and growth within existing public
facility systems with the City of Oak Park Heights; and,
' WHEREAS, the City Council for the Citv of oak Park
Heights deems it reasonable and appropriate to establish a
connection charge to be collected from areas annexed to the City
of oak Park Heights on or after July 29, 1988 and thereafter to
' help defray the expense, enlargement and enhancement of existing
public facility and municipal water and sewer systems within the
City of Oak Park Heights.
NOW, THEREFORE, BE IT RESOLVED by t' ^e City Council of
for the City of Oak Park Heights, Washington County, Minnesota
that as and fer the direct and proximate need of the City of Oak
Park Heights to expand, enlarge and create new public facilities
to serve areas annexed and to be annexed to the City of Cak Park
Heights from and after July 29, 1983 there shall hereby be
' established pursuant_ to statute and pursuant tc the ordinances of
the City of Oak Park Heights connection charges to be paid by all
areas hereinafter developed within the City of Oak Park Heights
that were not originally contained within the City's corporate
limits effective 7u-' 22, 1908, with said charges being due and
payable upon the occurrence or any one of the following events
whichever first occurs:
A. The issuance of a building permit;
8. The issuance of a permit allowing connection to
municipal water, sewer and /or storm serer systens;
C. Upon plat approval and /or executicn of a Development
Agreement relating to platting of real property;
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D. Upon the granting of a Planned Unit Development
per-nit and /or granting of a Development Agreement relating to a
Planned Unit Development;
E. Upon the. granting of any Conditional or Special Use
Permit for the allowance of use and construction of a facility
intended to be connected to the public facilities of the City of
Oak Park Heights.
That the following connection charges shall be collected
' in each such instance based upon the proposed development
aforementioned and based upon the following computations or
fractional proportions thereof:
A. Trunk sewer connection charges shall be collected at
the rate of $2,110.00 per acre;
' H. Trunk water works connection charge shall be
collected at the rate of $2,670.00 per acre;
' BE IT FURTHER RESOLVED that the aforementioned system of
charges and rates shall be adjusted from time to time by the City
Council based upon report and recommendation from the office of
the City Engineer and the office of the City Auditor. All such
adjustments and amendments thereto, if any, shall be effective
immediately upon adoption and shall be applied to all
developments thereat,pendinq which have not received approval by
' the Citv of Oak Park Heights or which may be applied for after
which such amendments have been approved by the City Council.
BE IT FURTHER
BE IT FURTffQ2
RESOLVED that all such computation shall
'
be made
by the office
of the City Clark and confirmed with the
offices
of the City
Engineer prior to collection thereof and
prior to
issuance of
any permit allowing development upon
'
property
within the
aforementioned areas of the Citv of Oak Park
Heights.
by the City Council
pursuant to Minnesota
' BE IT FURTHER RESOLVED that the aforementioned system of
charges and rates shall be adjusted from time to time by the City
Council based upon report and recommendation from the office of
the City Engineer and the office of the City Auditor. All such
adjustments and amendments thereto, if any, shall be effective
immediately upon adoption and shall be applied to all
developments thereat,pendinq which have not received approval by
' the Citv of Oak Park Heights or which may be applied for after
which such amendments have been approved by the City Council.
BE IT FURTHER
RESOLVED that
the aforementioned
connection charges
are in addition to
and not in lieu of costs to
be assessed to particular
properties
for the providing of
sanitary sewer, storm
sewer and water
improvements to each
'
property as may be
petitioned for same
or for which improvements
have been ordered
by the City Council
pursuant to Minnesota
Statute 429.031.
'
BE IT FURTHER
RESOLVED that
upon the recommendation of
the City Engineer,
the City Fiscal Consultant
and staff, the City
Council may delay
or defer payment of
any part or all of a
I'
connection charge to be collected as it affects any property to
be connected to the water and sanitary sever system upon
application of the property owner with such delay or deferral to
' be upon such terms " be established by the City Council.
Passed by the City Council of the City of oak Park
Heights this sue_ day of Febrl3jorly 1�
'
Barbara O'Neal, Mayor
1 Attest: �.
Vonne sWi'�,"�
Administrator /Treasurer
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1 Appendix B
1 Agency Review
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Metropolitan Council
' Working for the Region, Planning for the Future
LIL�%t! V %Lf /LGILI�. LIL jGf — ULCGSi
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RE: Oak Park Heights Water Supply Plan
Metropolitan Council District 12
Referral File No. 14735 -4
Dear Mr. Robertson:
The Metropolitan Council has completed its review of the Oak Park Heights Water Supply Plan, as
required under Minnesota Statutes, Section 473.859, subd.3, and offers the attached comments for
your consideration. A copy of the comments has also been forwarded to the Department of Natural
Resources for its consideration in its review of the city's plan.
This letter completes the review process of the Metropolitan Council. On behalf of the Metropolitan
Council, I thank you for your effort in preparing this plan. Should any questions arise on the
Council's review continents or on the process it followed, please feel free to contact Gary Oberts of the
Council's Environmental Services Division at 229 -2079.
Sincerely,
Helen Boyer
' Director, Environmental Services Division
CC: Jim Japs, DNR- Division of Waters
' Charles Amason, Metropolitan Council, District 12
Keith Buttleman, Director, MCES - Environmental Planning and Evaluation Dept.
t-MVk Wallis, Bonestroo, Rosene, Anderlik and Associates
' Richard Thompson, Metropolitan Council Sector Representative
1
230 East Fifth Street St. Paul. Minnesota 55101 -1633 (612) 222 -8423 Fax 229 -2183 TDD /TN 229 -3760
An Equal Opportunity Employer
November 4, 1996
Mike Robertson
City of Oak Park Heights
'
P.O. Box 2007
Oak Park Heights, MN 55082 -2007
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RE: Oak Park Heights Water Supply Plan
Metropolitan Council District 12
Referral File No. 14735 -4
Dear Mr. Robertson:
The Metropolitan Council has completed its review of the Oak Park Heights Water Supply Plan, as
required under Minnesota Statutes, Section 473.859, subd.3, and offers the attached comments for
your consideration. A copy of the comments has also been forwarded to the Department of Natural
Resources for its consideration in its review of the city's plan.
This letter completes the review process of the Metropolitan Council. On behalf of the Metropolitan
Council, I thank you for your effort in preparing this plan. Should any questions arise on the
Council's review continents or on the process it followed, please feel free to contact Gary Oberts of the
Council's Environmental Services Division at 229 -2079.
Sincerely,
Helen Boyer
' Director, Environmental Services Division
CC: Jim Japs, DNR- Division of Waters
' Charles Amason, Metropolitan Council, District 12
Keith Buttleman, Director, MCES - Environmental Planning and Evaluation Dept.
t-MVk Wallis, Bonestroo, Rosene, Anderlik and Associates
' Richard Thompson, Metropolitan Council Sector Representative
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230 East Fifth Street St. Paul. Minnesota 55101 -1633 (612) 222 -8423 Fax 229 -2183 TDD /TN 229 -3760
An Equal Opportunity Employer
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Metropolitan Council Comments on City of Oak Park Heights
Municipal Water Supply Plan (July. 1996)
INTRODUCTION
The Oak Park Heights water supply plan was submitted under the 1993 legislation (Chapter 186) requiring
' Metropolitan Area communities to amend their local comprehensive plans to include a water supply
element if the community has a municipal water supply system.
' The plan submittal was reviewed according to the "Metropolitan Area Community Water Supply Plan
Content Guidelines" adopted jointly by the Metropolitan Council and the Minnesota Department of Natural
Resources (DNR) in January 1994. The Council also reviewed the submittal as a local comprehensive plan
amendment, and applied the authorities contained in Minnesota Statutes, Chapter 473 in so doing.
Comments on the required conservation and emergency response plans will be submitted to the DNR for its
t consideration in review of these plans according to Minnesota Statutes, §103G.291, subd. 3. The Oak
Park Heights plan contains a statement of intent to complete a wellhead protection plan in accordance with
the Minnesota Department of Health 0WH) rules expected to be promulgated in late 1996.
GENERAL COMMENTS
t The plan presents a look at a city that has been experiencing moderate growth over the last eight years,
going from a 1988 population of 3,360 to a 1995 population of 3,800. The city projects the population to
increase to 4,200 by 2000 and 6,600 by 2020. Water use has steadily increased over the last 11 years,
' going from a demand of 134.4 million gallons (MG) per year in 1985 to 190.5 MG in 1995. The city
plans to add one new well in 1997.
' LOCAL AND COUNTY REVIEW COMMENTS
No comments regarding the water supply plan were received from communities adjacent to the city of Oak
' Park Heights, nor from Washington County.
TECHNICAL COMMENTS BASED ON CONTENT GUIDELINES
' Part I - Water Supply System Description and Evaluation (Sventek EPE)
' The Oak Park Heights system served a 1995 population of 3,800. The following table lists the
Metropolitan Council's population numbers found in the Regional Blueprint and the city of Oak Park
Heights' population projections and estimates. Since the numbers do differ, the Council and the city will
' need to resolve any differences before the city prepares its 1998 local comprehensive plan update.
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The water supply system relies on two Jordan Aquifer wells to meet the city's needs. The capacity of the
system is 2.44 million gallons per day (MGD), with a firm capacity of 1.22 MGD.
The plan includes water use records from 1986 through 1995. Annual water demand has ranged from
127.7 MG in 1986 to 190.5 MG in 1995. The five year average day demand (1991 -1995) was 0.484
MGD, with the average day demand in 1995 at 0.522 MGD. The maximum day demand ranged from
0.686 MGD in 1986 to 1.1 MGD in 1995. The 1986 -1995 maximum day -to- average day demand ratios
ranged from 1.7:1 to 2.6:1, all well below the recommended maximum ratio of 3:1. Keeping the
maximum day -to- average day demand ratios under 3:1 is one of the goals of the city's conservation plan.
The plan shows that total per capita water use ranged from 122 -137 gallons per capita per day (gpcd)
during 1988 to 1995. Residential per capita water use ranged from 60 -76 gpcd. This is within the
Metropolitan Council's recommended range for residential per capita use of 50 -80 gpcd.
Water use is projected to increase with population growth and the addition of new industrial and
commercial business. The city projects an increase in population served from 3,850 (1996) to 6,600
(2020). Average day demand is projected to increase from 0.529 MGD (1996) to 0.907 MGD (2020).
Maximum day demand is projected to increase from 1.4 MGD (1996) to 2.4 MGD by 2020. The plan
preparer assumed that the relative percentage of commercial -to- residential use would remain constant at
1996 levels when projecting future per capita use. Total per capita use is projected to be maintained at 137
gpcd.
Water use by customer category was included for 1988 -1995. In 1995, 49% was residential use, 35% was
commercial and institutional use, and 16% was unaccounted -for. Unaccounted -for water use has ranged
from 10-16% from 1988 -1995. The recommended American Water Works Association (AWWA)
maximum limit for unaccounted -for water use is 10 %, which the city should attempt to achieve. The city
has two large volume (> 5% of total demand) users; Washington County and the Minnesota Correctional
Facility.
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CIT O QAK:PARK
4E"1'RQFflLITAN CQUNCII..,
1990
3,486
3,486
1994
3,738
3,721
2000
4,200
4,000
2010
5,200
4,700
2020
6,600
5,350
The water supply system relies on two Jordan Aquifer wells to meet the city's needs. The capacity of the
system is 2.44 million gallons per day (MGD), with a firm capacity of 1.22 MGD.
The plan includes water use records from 1986 through 1995. Annual water demand has ranged from
127.7 MG in 1986 to 190.5 MG in 1995. The five year average day demand (1991 -1995) was 0.484
MGD, with the average day demand in 1995 at 0.522 MGD. The maximum day demand ranged from
0.686 MGD in 1986 to 1.1 MGD in 1995. The 1986 -1995 maximum day -to- average day demand ratios
ranged from 1.7:1 to 2.6:1, all well below the recommended maximum ratio of 3:1. Keeping the
maximum day -to- average day demand ratios under 3:1 is one of the goals of the city's conservation plan.
The plan shows that total per capita water use ranged from 122 -137 gallons per capita per day (gpcd)
during 1988 to 1995. Residential per capita water use ranged from 60 -76 gpcd. This is within the
Metropolitan Council's recommended range for residential per capita use of 50 -80 gpcd.
Water use is projected to increase with population growth and the addition of new industrial and
commercial business. The city projects an increase in population served from 3,850 (1996) to 6,600
(2020). Average day demand is projected to increase from 0.529 MGD (1996) to 0.907 MGD (2020).
Maximum day demand is projected to increase from 1.4 MGD (1996) to 2.4 MGD by 2020. The plan
preparer assumed that the relative percentage of commercial -to- residential use would remain constant at
1996 levels when projecting future per capita use. Total per capita use is projected to be maintained at 137
gpcd.
Water use by customer category was included for 1988 -1995. In 1995, 49% was residential use, 35% was
commercial and institutional use, and 16% was unaccounted -for. Unaccounted -for water use has ranged
from 10-16% from 1988 -1995. The recommended American Water Works Association (AWWA)
maximum limit for unaccounted -for water use is 10 %, which the city should attempt to achieve. The city
has two large volume (> 5% of total demand) users; Washington County and the Minnesota Correctional
Facility.
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The city does not include monthly water use by customer category. Monthly water use by customer
category produces a better understanding of seasonal demands, and the city should consider recording this
information.
The city currently does not have a treatment plant. Raw water from the wells is treated with fluoride at the
t well pump houses. The city has two elevated reservoirs with a total storage capacity of 0.75 MG.
The existing distribution system consists of lines that vary in size from 4" to 12" in diameter. The existing
system operates under one pressure zone. Static pressures range from 60 - 90 psi throughout the system.
The city has not had any problems with high or low pressure areas in the distribution system.
1 According to the plan, the existing system has sufficiently served the various demands placed on it. One
new well will be required to meet the anticipated demands in the year 2020. A new well is needed and
scheduled for 1997 to provide adequate firm capacity to equal the maximum day demand. If growth rates
deviate from the rates outlined in the plan, the phasing schedule will need to be revised.
The city is ranked #48 on the current (February 2, 1996) MDH statewide priority list for wellhead
' protection. The plan states that a wellhead protection plan will be completed in accordance with the rules
expected to be promulgated in 1996. The city should be aware that the installation of a new well in 1997
will propel the city to the top priority on the MDH list,
' Comments on the capital improvement program are made in Part IV of the review.
Part II - Emergency P (Sventek. EPE)
The plan includes an emergency telephone list and an emergency reporting form. The emergency reporting
' form is a good idea and will aid in documenting any emergency for proper action and for long -term analysis
of problem areas.
' Currently, the city has no interconnections with neighboring communities. Future connections with the
cities of Stillwater and Bayport will be evaluated. The conjunctive use of surface and ground water is not a
viable option. Possibilities for water supply provisions during extended emergency periods include bringing
' potable water in via trucks, or investigating the possibility of purchasing water from neighboring
communities. The Metropolitan Council supports the city's effort to interconnect with neighboring
community supplies for emergency purposes.
' The plan contains the following short-term demand reduction measures; voluntary reduction measures,
sprinkling restrictions, and water allocation restrictions. The plan states that initial emergency response
' will include actions to augment supplies and/or reduce demand. Severe water shortages will require the
city to allocate water based on the priorities established by Minnesota Statutes, §103G.261.
The trigger levels for implementing emergency responses are based on well pump supply capacity. The
system should always have one well pump in standby or back -up position. As demand reaches the firm
capacity, demand reduction measures are initiated.
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The focus of the short-term reduction section of the plan is on a voluntary reduction of non - essential uses.
Enforcement becomes more stringent as the emergency progresses. Odd/even sprinkling bans will be
monitored and enforced by the water and police departments. Failure to comply with water use restrictions
may be subject to a misdemeanor.
The plan addresses water supply protection. All tools necessary for repairs of water lines and pump house
equipment are on hand at all tunes. No major repairs have been necessary recently. The city periodically
measures the static water levels and pumping levels. Trending of water levels should be included in future
plan updates. A wellhead protection plan will be completed when the MDH rules are formally adopted.
The emergency plan ends with sections on emergency resources and response procedures. The section
' includes some good recommendations for actions for the city to implement regarding maintenance
procedures.
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Part III - Water Conservation Plan (Sventek. EPE)
The water conservation plan is designed to reduce the demand for water, improve the efficiency of water
use, and reduce loss and waste of water. Implementation of the conservation plan is intended as an
alternative to developing additional sources of water to meet peak demand for non -essential uses of water.
Reducing the peak demand may delay or reduce the need for costly infrastructure requirements. The city's
conservation goals are to keep the total per capita water use at or below 137 gpcd, and to keep the average
day -to- maxim day demand ratio below 3:1. Demand reduction programs will target uses associated
with peak demands, such as outdoor watering practices. The city should keep accurate records of
maximum day and average day demand to assure the maxim day -to- average day demand ratio remains
below 3:1.
Unaccounted -for water use was 16% in 1995. The city should keep unaccounted -for water loss under the
AWWA - recommended maximum of 10 %. Maintaining annual records of the unaccounted -for water will
allow the city to monitor this loss and develop programs that address appropriate needs. As the system
continues to age, the city may need to spend more money on a leak detection, repair, and maintenance
program.
All current and future water users are metered. The plan recommends establishing a program for meter
calibration and repair.
Oak Park Heights uses a base rate with a decreasing block rate structure after the base rate volume is
reached. The city charges a base rate of $18.30 for the first 15,000 gallons ($1.22/1,000 gallons) and
$0.95 /1,000 gallons after 15,000 gallons. An increasing block, or seasonal block, would better achieve the
conservation goal and reduce overall per capita demand.
Regulation occurs through state and federal plumbing codes. The city should consider adopting a
permanent odd/even sprinkling ban. The city should also evaluate the benefits of a watering ban between
the hours of 10:00 A.M. and 6:00 P.M. during May through September. During this time and season,
water use is high, but the efficiency of adding water to lawns is low because of evaporation.
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Oak Park Heights will focus its education efforts on education materials that target user groups and
practices. Education will target benefits of water conservation, focusing on habits and efficient uses of
' water, water efficient plantings for new developments and commercial users.
The city will enforce the existing plumbing codes relating to retrofitting existing water fixtures. The city
' will not pursue a mandated retrofit program at this time. Public buildings should be retrofitted as part of
their maintenance program. For the residential sector, higher use fixtures will be replaced with lower
consumption fixtures as time passes and old fixtures need to be replaced.
Static and residual water pressures in the water service area should be maintained between 40 -90 psi.
Users with pressures above 90 psi will be required to install individual pressure reducing valves at the point
' of service.
The key to a successful conservation program will be aggressive implementation of the elements
recommended in the plan.
Part IV. Metropolitan Area Plan Elements (Sventek. EPE)
' Elements addressing this section of the plan guidelines are generally contained elsewhere throughout the
plan. The city has a policy of providing its customers with safe, high quality, and affordable drinking
' water. The system will provide this service while assuring the long -term protection of its supply from
contamination and excessive depletion.
' The city is ranked #48 on the MDH wellhead protection plan list. This means that shortly after the rules
are formally adopted, a wellhead protection plan will need to be completed. The city will, however, go to
the top of the priority list when it adds a new well in 1997.
' The city has no interconnections with neighboring communities. The city will investigate the possibility of
future interconnections with the cities of Stillwater and Bayport. The Metropolitan Council is highly
supportive of any effort to jointly develop and share the resource, and would support the city's effort to
interconnect with Bayport or Stillwater.
' City regulations are in place to require the use of water meters. The city relies on state and federal
plumbing codes to provide short- and long -term demand reduction.
The plan includes a brief capital improvement program (CIP). The plan identifies that $510,000 would be
needed for the construction of well #3 in 1997. No other improvements are included at this time. The city
is waiting until it completes its new Comprehensive Plan in 1998 before the location of future wells,
towers, and trunk water mains can be determined. Due to the uncertainty of exact development patterns at
' this time, trunk and lateral mains are not included in the CIP. Once the new Comprehensive Plan is
complete, Part IV of the water supply plan will need to be updated. Financing of system improvements are
fully funded through charges against new development.
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The water supply plan was prepared based on the 1979 Comprehensive Plan for the city. The city is in the
process of developing a new land use plan that will be completed in 1998. This information should have
been updated as part of the water supply planning process. Since it was not, the city should be aware that
altered land use assumptions in the future may necessitate an update of the water supply plan.
' SUMMARY
Technical comments were prepared by Metropolitan Council staff according to the content guidelines, and
focus primarily on the conservation efforts of the city. The city needs to keep good records of its
unaccounted -for water use and devote some effort to keeping it below 10 %. The maximum day demand -to-
' average day demand ratio should also be kept below the recommended 3:1 ratio. The residential per capita
demand numbers need to be clarified. Overall per capita water use will be maintained, as suggested in the
plan. Any changes in the land use assumptions in the future may necessitate the need for revising the CIP
' and impact on local Comprehensive Plan sections of the water supply plan.
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