Utilities 9 - Apple Valley

9
Utilities
This chapter contains elements of the Comprehensive Plan
related to municipal utility systems: sanitary sewer, water
supply and surface water management.
Sanitary Sewer
Introduction
The City of Apple Valley is located in Dakota County in
the southern portion of the seven-county metropolitan
area (see Figure 3.9 in Chapter 3). The City is provided
excellent transportation service by State Highway 77 and
Interstate 35E. Apple Valley has grown steadily from 1960
to the present. The population has increased from 585 in
1960 to 45,527 in 2000. The City is projected to reach a
population of 71,200 by 2030.
The Metropolitan Land Planning Act (amended 1995)
requires local governments to prepare comprehensive plans
and submit them to the Metropolitan Council to determine
their consistency with metropolitan system plans. The local
Comprehensive Plan is to include a sanitary sewer element
covering the collection and disposal of wastewater generated by the community. Similarly, the Metropolitan Sewer
Act requires local governments to submit a Comprehensive
2030 Comprehensive Plan
October 2009
Utilities | 9-1
Sewer Plan (CSP) which describes the current and future
service needs required from Metropolitan Council Environmental Services.
In March, 2005 the Metropolitan Council adopted
a revised Water Resources Management Policy Plan
(WRMPP). The 2030 WRMPP includes the metropolitan
wastewater system plan with which local comprehensive
plans must conform. The method Apple Valley has chosen to demonstrate its conformance is through a separate
Comprehensive Sewer Plan (CSP). The Apple Valley CSP
updates previous sewer planning efforts and describes in
detail the expansion of the City’s sanitary sewer system to
serve urban development. Apple Valley has prepared this
section of the Comprehensive Plan to demonstrate its conformance to the regional plan. This section of the Utilities
chapter summarizes Apple Valley’s CSP and provides the
specific information needed to meet the 2030 WRMPP
requirements.
Existing Sanitary Sewer System
The City’s trunk sanitary sewer system is shown on Figure
9.1. The trunk system in the City is largely built and consists of gravity lines primarily ten inches in diameter and
greater, lift stations, and forcemains. The City is divided
into six sewer districts, each defining the limits of service
for a separate trunk system. The majority of the City,
composed of Farquar Lake, Southwest, South Central,
and Southeast Districts, drains south. The remainder of
the City, composed of Burnsville Outlet and Eagan Outlet Districts, drains north. The Eagan Outlet, consisting
of a golf course, regional park, zoo, and small residential
area, is served only by sewer laterals and does not contain
trunk sewers.
There are approximately11,181 acres in the City of Apple
Valley, of which approximately 10,700 acres are developable. Of this total, 9,400 acres are served by the MCES
Empire wastewater treatment plant (WWTP) located
near 197th Street East and the Vermillion River, in Section 21 of Empire Township. Conveyance to the Empire
plant is provided by the MCES Interceptors 3-LV-610,
9601, and 7203.
Table 9.4 presents projected sewer flows for the City, broken into the Empire and Seneca WWTP service areas,
based on Metropolitan Council projections. Table 9.5
presents more detail by organizing projected sewer flows
by interceptor as required by Metropolitan Council. These
Wastewater from approximately 1,800 acres in the northern portion of Apple Valley is served by the MCES Seneca
wastewater treatment plant located near Comanche Road
in Section 21 in Eagan. Conveyance to the Seneca plant
is provided by the MCES Interceptor 3-BV-35 and trunk
sewers in the City of Eagan.
Table 9.1 presents Metropolitan Council’s population,
household, and employment projections for Apple Valley.
Sewered
Sewered
Sewered
Population Households Employment
59,667
21,557
16,030
63,360
23,454
17,645
67,053
25,350
19,260
68,103
26,015
20,135
69,153
26,680
21,010
Year
2010
20152
2020
20252
2030
Forecasts
1
Metropolitan Council Water Resources Management Policy Plan, May, 2005
2
Values Interpolated
Projections for Empire WWTP1
Tables 9.2 and 9.3 present projections of sewered population, households, and employees for the portions of the
1990
2000
Table 9.2
Development Framework
2010
2020
2030
Population
34,598
45,527
61,700
69,100
71,200
Households
11,145
16,344
22,400
26,100
27,500
Year
Sewered
Population
Sewered
Households
Sewered
Employment
2010
20152
2020
20252
2030
2,060
2,060
2,060
2,060
2,060
820
820
820
820
820
720
780
840
915
990
1
Employment 6,528
11,250
16,800
20,100
22,000
Metropolitan Council Projections
Table 9.1
9-2 | Utilities
City served by the Empire and Seneca wastewater treatment plants, respectively, as prepared by the Metropolitan
Council and presented in its 2030 WRMPP.
October 2009
Metropolitan Council Water Resources Management Policy Plan, May, 2005
2
Values Interpolated
Projections for Seneca WWTP1
Table 9.3
City of Apple Valley
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I:\68\6802210\cad\report504.apr
layout: Sanitary Plan
Trunk Sanitary Sewer System
Figure 9.1
2030 Comprehensive Plan
October 2009
Utilities 9-3
Year
Projected Average
Flow to Empire
WWTP (MGD)
Projected Average
Flow to Seneca
WWTP (MGD)
2010
20152
2020
20252
2030
4.71
4.96
5.21
5.25
5.28
0.16
0.16
0.16
0.16
0.16
1
Metropolitan Council’s Water Resources Management Policy Plan (May 2005).
2
Values Interpolated
Wastewater Flow Projections1
Table 9.4
Year
2010
2015
2020
2025
2030
MCES Interceptor
3-LV-610
1.38
1.45
1.52
1.53
1.54
9601
1.81
1.91
2
2.02
2.03
7203
1.52
1.6
1.68
1.69
1.7
3-BV-35
0.16
0.16
0.16
0.16
0.16
Flow Projections by Interceptor
Table 9.5
projections are based on Metropolitan Council methodology, which uses 75 gallons per day/per person and 25
gallons per day/per employee.
Among other objectives, the CSP must accomplish the
following:
9-4 | Utilities
1. Provide Metropolitan Council with sufficient detailed
information so that it can make reasonable plans
for upgrades to its interceptors and the Empire and
Seneca WWTPs.
2. Provide a trunk system that allows the City a certain
measure of reserve capacity in the event that a high
sewage generating use appears within its borders or
to allow for localized higher density.
The previously cited forecasts, when combined with the
sewer map and modeling information contained in the
CSP, gives Metropolitan Council the information they
need to plan and maintain the metropolitan system. The
subsequent sections of the CSP discuss sizing and planning
the City’s own trunk system, and the spreadsheet sewer flow
models in the CSP support this purpose.
The flow projections presented in the CSP originate from
the land use statistics that are based directly on the land use
area that accompanies Apple Valley’s 2030 Comprehensive
Plan (see Figure 4.5 in the Land Use Chapter). Certain
reductions in land use area are made to account for wetlands, steep slopes, etc., and a net developable acreage for
each land use category is thus created. The net acreage is
multiplied by standard unit flow rates to obtain an average
flow for each sewershed.
The purpose of the spreadsheets in the CSP is to conservatively estimate demand at the municipal level so that no city
trunk is undersized for its projected sewershed. The unit
flow rates used to generate average flows in part represent
the “old economy” where commercial and industrial land use
meant manufacturing and thus the potential for high sewage flows. In the “new economy”, commercial and industrial
land use typically means retail, offices, and warehousing
which generate very little sewage compared to the old inOctober 2009
Land Use Type
Person/ Gal/Cap/ Units/ Gal/Acre/
Unit
Day
Acre
Day
Low Density
Residential
3.5
100
1.8
630
Medium Density
Residential
2.5
80
9
1,800
High Density
Residential
2
70
14
1,960
Commercial/
Industrial
2,000
Institutional
1,000
Parks/
Recreation
250
Undevelopable
(Water/Pond)
0
System Design Flow Rates
Table 9.6
dustrial facilities. Nonetheless, typical land use categories
allow for a wide range of uses and the chance remains that
localized heavy users of sanitary sewer capacity might locate in Apple Valley. To cover this possibility, Apple Valley
continues to use the design rates shown in Table 9.6.
Sanitary Sewer Design Criteria
Land Use
The 2030 land use plan for the City of Apple Valley served
as the basis for the development of the sanitary sewer flow
projections and analysis of the trunk system (see Figure 4.5
in the Land Use Chapter). Detailed descriptions of the
various land uses are found in the Land Use chapter.
City of Apple Valley
Using Figure 4.5 in the Land Use Chapter, the area of
each land use was determined for each sewer subdistrict.
For purposes of sewer modeling, certain land uses were
combined. Commercial, Industrial, Mixed Business
Campus, and Mixed Use were combined into a single
category of Commercial/Industrial. Private Recreation
was combined with Parks and Open Space. Areas of each
land use by sewer subdistrict are presented in Appendix
A of the CSP.
Estimated Average Wastewater Flows
Municipal wastewater is made up of a mixture of domestic
sewage, commercial and industrial wastes, groundwater
infiltration, and surface water inflows. With proper design
and construction, groundwater infiltration and surface
water inflows, often called infiltration/inflow (I/I), can be
minimized. The flows due to I/I are accounted for in the
analysis and design of the trunk sewer system.
The anticipated average wastewater flows from the various
subdistricts were determined by applying unit flow rates to
each of the land use categories. The “system design” unit flow
rates are presented in Table 9.6. The average wastewater
flows for each subdistrict are presented in Appendix B of
the CSP.
For all land uses, unit rates/acre were used to generate
average flow projections. The units per acre assumptions
for each land use were based in part on information from
the 2030 Comprehensive Plan regarding projected number
of units for each land use.
Peak Flow Factors
The sanitary sewer system must be capable of handling
the anticipated peak wastewater flow rate including any
I/I. The design peak flow rate can be expressed as a vari2030 Comprehensive Plan
able ratio to the average flow rate. Curves used to describe
this ratio, called the Peak Flow Factor (PFF), indicate a
decreasing ratio of peak flow to average flow with increasing average flow.
The PFF values applied in this study are shown in Figure
9.2. These values are generally conservative and widely used
throughout the state for municipal planning. They include a
standard allowance for I/I, which is typical of new sanitary
sewer construction as well as properly operating existing
sewers. The design flows for each subdistrict are presented
in Appendix C of the CSP.
Sanitary Sewer Trunk System
General
The trunk sanitary sewer system layout for the City of
Apple Valley is presented on Figure 9.1. This map shows
sanitary sewer districts, existing and proposed trunk sanitary sewers, lift stations, and force mains. In addition, sizes
of all sewers are shown with reference points along each
pipe. The trunk sewer system is largely built at this time.
The modeling of the sanitary sewer system was based
on a variety of parameters, such as: land use, population
density, standard wastewater generation rates, topography,
and future land use plans. Based on the topography of the
undeveloped areas, the sewer subdistricts were created
and the most cost-effective locations for future trunk line
facilities were determined. The location of smaller sewer
laterals and service lines are dependent upon future land
development plats and cannot be accurately located from
a study of this type.
Both the existing and proposed pipe systems were evaluated and broken up into design segments. Each end of a
October 2009
Peak Flow Factors
Figure 9.2
design segment has a node assigned to it. The nodes were
designated for the following reasons:
1. Flow from a subdistrict entering the pipe network.
2. Significant grade change has occurred.
3. Change in pipe size.
Utilities 9-5
4. Two or more trunks connect.
5. Manmade elements affecting location and installation costs for the trunk system or lateral service of
the subdistricts.
The proposed alignments shown on Figure 9.1 generally
follow the natural drainage of the land to minimize the use
of lift stations and consequently provide the City with the
most economical ultimate design sanitary sewer system.
Minor adjustments in the routing and size of the trunk
facilities will take place as determined by the specific land
use and development conditions at the time of final design.
Any such adjustments are expected to deviate minimally
from this plan.
Each subdistrict contains at least one collection point where
the subdistrict’s sewage is defined to enter the pipe network.
Upstream of that collection point, a lateral network of 8”
gravity lines can serve unserviced areas.
Large Sewer Users
At the present time, there are no major industries in Apple
Valley whose average daily sewage flow exceeds 50,000
gallons. At this time, no industries in the City require
pretreatment of their wastewater before discharge into
the City’s system.
Intercommunity Flows
There are a total of seven locations near the Apple Valley
City limits where intercommunity flows are either existing
or proposed. A listing of these locations and their average
flows is presented in Table 9.7 These flows all lead from
Apple Valley through other municipalities to the Empire
or Seneca treatment plants.
9-6 | Utilities
Location
From
To
Pt. 1
Pt. 27
Pt. 44
Pt. 72
Pt. 73
Pt. 69
Pt. 74
Apple Valley
Apple Valley
Apple Valley
Apple Valley
Apple Valley
Apple Valley
Apple Valley
Lakeville
Lakeville
Lakeville
Eagan
Eagan
Burnsville
Burnsville
Avg. Flow
(MGD)
2.474
3.477
3.046
0.061
1.088
0.255
0.039
Intercommunity Flows
Table 9.7
The City of Apple Valley currently has an ordinance
regulating the installation of on-site wastewater disposal
systems. Under this ordinance, the design of the system is
reviewed in accordance with the guidelines of Minnesota
Pollution Control Agency Standards MN Rule 7080, and
a permit is required before the system can be installed.
The City tracks and notifies permit holders of the need
to pump their systems every three years. Copies of the
inspection reports are sent to the City and Dakota County.
Dakota County is in the process of updating their ISTS
ordinance. The City will be updating its ordinance by 2011
to comply with State and County requirements.
Individual Sewage Treatment Systems
System Design and Recommendations
Presently, approximately 64 single-family residences utilize
individual on-site facilities for the disposal of their wastewater. It is anticipated that the number of on-site systems
in Apple Valley will be reduced as municipal sewer service is
extended throughout the City and that few on-site systems
will remain in operation by the year 2015.
The City is divided into six sewer districts. A summary
of characteristics and special issues within each district is
provided below.
The locations of present on-site systems are shown on
Figure 9.3. At the present time, no significant problems
are known to exist for the existing on-site systems.
New individual residential disposal systems will be permitted in the areas where service is not available at a minimum
density of one system per ten acre parcel, provided the
systems are installed in accordance with Minnesota Pollution Control Agency Standards MN Rule 7080. Further,
on-site disposal systems will not be allowed in areas with
slopes greater than 18%, wetlands, floodplains, areas of high
groundwater, or areas where impervious soils or bedrock
are located near the surface.
October 2009
Southwest District
The trunk sewer serving the Southwest District as well as
portions of Lakeville was put into operation in 1964 with
treatment being performed at the Apple Valley treatment
plant in the northeastern part of Lakeville. The Apple Valley treatment plant has since been replaced by the Empire
plant which currently treats wastewater generated in the
Southwest District.
All of the sanitary sewer trunk construction in the Southwest District has been completed. All trunks within the
district connect to the 24-inch diameter trunk constructed
in 1964. This trunk drains to a lift station at the intersection
of 160th Street and Cedar Avenue on the Lakeville-Apple
Valley boundary. This MCES owned lift station pumps the
wastewater into an MCES conveyance system which carries
it to the Empire Treatment plant.
City of Apple Valley
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Existing On-Site Facilities
Figure 9.3
2030 Comprehensive Plan
October 2009
Utilities 9-7
South Central District
The South Central District contains the largest areas of
undeveloped property within the City. Of the remaining
areas in the district yet to be developed, the majority are in
active mining areas. It is expected that these gravel mining
operations will continue for 10 years or more within the
South Central District.
The sanitary sewer conveyance system within the South
Central District is complete with the exception of a small
trunk which will be completed when the gravel mining
areas develop.
Southeast District
The East Trunk sanitary sewer is in place and runs through
the Southeast District in a north-south direction. This
trunk conveys wastewater from the Farquar Lake District
as well as from the Southeast District to Point 44 which is
located on the Lakeville-Apple Valley boundary. From this
point, the wastewater is carried through MCES facilities to
the Empire treatment plant. The sanitary sewer conveyance
system within the Southeast District is nearly complete.
Farquar Lake District
near 140th Street and 142nd Path where it discharges
into a trunk sewer in the Southeast District. The sanitary
sewer conveyance system within the Farquar Lake District
is complete.
the wastewater from this portion of Apple Valley across
Interstate 35E into the City of Burnsville. Approximately
70 percent of this force main is located within MnDOT
right-of-way or within Burnsville northwest of I-35E.
Eagan Outlet District
Infiltration and Inflow
Wastewater from three subdistricts along the northern
perimeter of Apple Valley is conveyed to the Seneca treatment plant in Eagan through trunk sewers located in that
city. Subdistrict EO-A drains to Eagan at Point 72 which
lies midway between Cedar Avenue and Galaxie Avenue
on the Eagan boundary.
The other two subdistricts in the Eagan Outlet District
are EO-B which consists of the Minnesota Zoological
Gardens and EO-C which is comprised of Dakota County
Regional Park property and the Valleywood Golf Course
and is likely to generate a very small amount of wastewater.
Both EO-B and EO-C drain toward the Eagan-owned
sewer interceptor located on Johnny Cake Ridge Road at
the Eagan boundary. If further development is ever proposed in these areas, the flows would be directed to Johnny
Cake Ridge Road.
The network of conveyance systems in the Farquar Lake
District centers around two sanitary sewer lift stations.
The western and central portions of the district are served
by a sanitary sewer lift station on 134th Street near Pilot
Knob Road. Wastewater is carried from this lift station by
way of a 14-inch diameter force main to the intersection of
140th Street and Pilot Knob Road where it discharges into
a trunk sewer located in the Southeast District.
Burnsville Outlet District
The eastern portion of the Farquar Lake District is served
by a lift station located on the south side of Dominica
Way near Diamond Path West. A 12-inch diameter force
main conveys wastewater from this lift station to a point
Subdistricts BO-B, BO-C, and BO-D drain through an
existing system of trunks and laterals to a lift station on
Chaparral Drive in the Palomino Hills area of Apple Valley. This lift station and the appurtenant force main pump
9-8 | Utilities
The Burnsville Outlet District consists of four subdistricts
which drain into the Seneca wastewater treatment plant
through the City of Burnsville at two separate locations.
Subdistrict BO-A consists of 44 acres of property near
140th Street and County Road 11. This property will drain
through sewer laterals to the Burnsville-owned lift station
on the north side of Lake Alimagnet.
October 2009
The Metropolitan Council has instituted an Inflow/
Infiltration Surcharge Program. The fundamental policy
statement summarizing this program is that Metropolitan
Council “will not provide additional capacity within its interceptor system to serve excessive inflow and infiltration.”
The Council establishes inflow and infiltration thresholds
for each of the communities that use its system. Communities that exceed this threshold are required to eliminate this
excess flow within a reasonable time frame.
Currently, Apple Valley generates dry weather flow of approximately 60 gallons of wastewater per capita per day
(gcd). A typical annual flow, which includes infiltration
and inflow (I/I), is approximately 10 gcd higher.
The majority of the sanitary sewer system in the City is
above the water table. In addition, the City has a proactive
program directed at identifying and correcting I/I, including the following:
ŠŠ
Stringent testing of all new sanitary sewer lines.
ŠŠ
Televising of clay pipes as well as areas where problems
have been identified.
ŠŠ
Manholes are inspected as part of sewer cleaning
operations, which are performed daily March through
November, weather permitting. Approximately one
third of the system is cleaned (and manholes inspected)
annually. Manholes are also inspected as part of the
televising program. Manholes are repaired as needed.
Internal chimney seals are installed on manholes with
City of Apple Valley
plastic rings where I/I has been identified. These rings
are being installed in low points of roadways during
new construction and reconstruction.
ŠŠ
The City Code prohibits owners, occupants or users of
any premises to direct into or allow any storm water,
surface water, water from air conditioner systems,
oil or other material to drain into the sanitary sewer
system.
Cost Estimates
Trunk Sanitary Sewer Costs
The Comprehensive Plan anticipates completion of Apple
Valley’s Trunk Sanitary Sewer System. The cost estimates
presented in this chapter are based on 2007 construction
costs and can be related to the value of the ENR Index
for Construction Costs of approximately 7,966 (Annual
Average Index for 2007). Future changes in this index are
expected to fairly accurately describe cost changes in the
proposed facilities. During interim periods between full
evaluation of projected costs, capital recovery procedures
can be related to this index. A summary of the cost estimates is presented in Table 9.8. The cost estimates are for
construction, legal, engineering, administrative, and easement acquisition costs.
A Capital Improvement Program based on estimated phasing of trunk sewer construction is presented in Table 9.9.
This table includes the service areas added, the estimated
cost of each segment, and the total expenditure.
South Central District
$388,000
10% Miscellaneous Trunks (Under 10”)
$39,000
Total Cost to Complete Trunk System
$427,980
Cost Summary
Table 9.8
Year
Subdistrict
Flow Added
2015
SC-B2
SC-B1
Trunk Extension
From
Point
28A
28
To
Point
28
27
Est. Cost
$83,000
$305,000
Trunk System Phasing
Table 9.9
Capital Improvement Program
The installation of the City of Apple Valley’s trunk sanitary
sewer system has proceeded at a rapid rate with a majority
of the City currently served by trunk sanitary sewer. At this
time, most of the City’s trunk system has been constructed.
It is anticipated that the remaining growth of the sewer system will continue at a somewhat slower rate with the trunk
system being essentially complete by the year 2015.
2030 Comprehensive Plan
October 2009
Utilities 9-9
Water Supply
Introduction
Minnesota Statute 473.859 requires water supply plans to
be completed for all local units of government in the sevencounty Metropolitan Area as part of the local comprehensive planning process. The City of Apple Valley has created
and adopted two policy plans to serve as the guides for the
construction, operation and maintenance of the municipal
water system - the Water Supply and Distribution Plan
Year
Total
Population
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
42,869
43,899
44,899
45,430
45,527
46,688
47,737
48,544
49,644
50,299
Population
Total
Served
Connections
42,769
43,699
44,799
45,330
45,427
46,588
47,637
48,444
49,544
50,199
12,162
12,754
12,891
13,570
13,717
14,026
14,240
14,482
14,496
14,798
(WSDP) and the Water Emergency and Conservation
Plan (WECP). The City of Apple Valley uses these plans
as tools to provide and maintain a potable water supply in
adequate amounts to meet the needs of the community.
1. Population: The WSDP used the same number as
is currently being proposed for the 2020 population
(69,100), but that report considered it to be the
ultimate population. The ultimate population has
increased to 71,200 (in 2030), or an increase of just
under 2% .
In conjunction with the preparation of the 2030 Comprehensive Plan, the City undertook a review of the
WSDP and WECP. This review reached the following
conclusions:
Residential
Water Sold
(MG)
C/I/I Water
Sold
(MG)
Irrigation
Water Sold
(MG)
Wholesale
Deliveries
(MG)
1,467
1,340
1,426
1,443
1,578
1,690
1,448
1,766
1,618
1,527
199
230
229
243
227
239
216
231
242
227
95
102
120
148
171
260
234
269
292
246
0
0
0
0
0
0
0
0
0
0
Total Water Total Water
Sold
Pumped
(MG)
(MG)
1,761
1,672
1,775
1,834
1,976
2,189
1,898
2,266
2,152
2,000
2. Water Demand: The Water Emergency and Conservation Plan uses an ultimate Average Daily Demand of
9.7 million gallons per day (MGD) and a Maximum
Day Demand of 24.2 MGD. This calculates to an
Percent
Unmetered/
Unaccounted
Average
Demand
(MGD)
Maximum
Demand
(MGD)
10
8
8
8
9
11*
11*
14*
12.5*
12.7*
5.3
4.9
5.3
5.4
5.9
6.7
5.8
7.2
6.7
6.4
15
13.3
12.5
13.9
13.1
21.6
15.1
20.2
16
18.9
1,955
1,815
1,939
1,987
2,181
2,470
2,129
2,638
2,461
2,339
Residential
Total gallons/
gallons/
capita/day
capita/day
94
84
87
87
95
99
83
100
89
83
125
113
118
120
131
145
122
149
136
127
MG – Million Gallons MGD – Million Gallons per Day C/I/I- Commercial, Industrial, Institutional
* See Part III, Section A, Unaccounted Water
Residential. Water used for normal household purposes, such as drinking, food preparation, bathing, washing clothes and dishes, flushing toilets, and watering lawns and gardens.
Institutional. Hospitals, nursing homes, day care centers, and other facilities that use water for essential domestic requirements. This includes public facilities and public metered uses. You may want to maintain separate institutional water use records for emergency planning and allocation purposes.
Commercial. Water used by motels, hotels, restaurants, office buildings, commercial facilities, both civilian and military.
Industrial. Water used for thermoelectric power (electric utility generation) and other industrial uses such as steel, chemical and allied products, food processing, paper and allied products, mining, and petroleum refining.
Wholesale Deliveries. Bulk water sales to other public water suppliers.
Unaccounted. Unaccounted for water is the volume of water withdrawn from all sources minus the volume sold.
Residential Gallons per Capita per Day = total residential sales in gallons/population served/365 days Total Gallons per Capita per Day = total water withdrawals/population served/365 days
NOTE: Non essential water uses defined by Minnesota Statutes 103G.291, include lawn sprinkling, vehicle washing, golf course and park irrigation and other non essential uses. Some of the above categories also include non essential uses of water.
Historic Water Demand
Table 9.10
9-10 | Utilities
October 2009
City of Apple Valley
average demand of approximately 136 gallons per
capita per day and a maximum day to average day ratio
of 2.5. The WSDP used an ultimate Average Daily
Demand of 9.09 MGD and a Maximum Day Demand
of 29.5 MGD. This calculates to an average demand
of approximately 130 gallons per capita per day and
a maximum day to average day ratio of 3.25. As such,
the facilities proposed in the WSDP are more than
adequate for the ultimate demand numbers presented
in the Water Emergency and Conservation Plan.
3. Supply: The projected supply from the WSDP indicated a total of 23 wells with an estimated total firm
capacity of 21,250 gpm, or 30.6 MGD. This is the
closest whole number of wells to match the required
capacity of equal to or greater than the expected
maximum day demand. Since the number is larger
than the revised expected maximum day demand,
the total number of wells anticipated in the WSDP
is sufficient.
4. Treatment: The projected total treatment capacity
from the WSDP is 24.0 MGD. The recommended
treatment capacity is determined to be approximately
80% of the maximum day demand with the remaining
20% made up from blending raw water. Since 80%
of the higher maximum day demand of 30.0 MGD
is 24.0 MGD, the proposed treatment capacity is
sufficient. This capacity is expected to be achieved
through a doubling of the current nominal plant
capacity of 12.0 MGD.
5. Storage: As soon as the Quarry Point Reservoir
goes on-line the system will be at its ultimate storage capacity. The City will have 14.7 MG of total
storage and approximately 9 MG of usable storage.
For the City of Apple Valley, usable storage has been
determined to be the storage available within 40 feet
2030 Comprehensive Plan
of the High Water Level. The required usable storage
is equal to 30% of the maximum day demand. With
a projected maximum day demand of 30 MGD, the
required usable storage volume is 9 MG, which is
what is available.
The ten largest water users are shown in Table 9.11. These
customers account for 160 million gallons of annual consumption.
6. Overall Operations: Taking a conservative approach
and applying the higher unit demands of the WSDP
to the higher population projected in the 2030 Comprehensive Plan, the ultimate planned ultimate supply,
storage, and treatment facilities as presented in the
WSPD remain adequate.
The Apple Valley Water Treatment Plant (WTP) is an iron
and manganese removal facility. Raw water is pumped from
deep wells in the Jordan and Prairie Du Chein-Jordan aquifer to the WTP. The water is initially treated with chlorine
and potassium permanganate (KMnO4). These chemicals
are used as oxidants to bring the iron and manganese out
of suspension so they can be filtered out in the filter cells.
The water then flows through approximately 30 inches of
sand media, where the iron and manganese (no longer in
suspension) are trapped on top of the media. The filtered
water is now treated with chlorine and fluoride prior to
flowing to the clearwell for storage until needed. From the
Apple Valley’s water supply and distribution system is developed consistent with the Metropolitan Council’s Water
Resources Management Policy Plan (WRMPP). This section of the Utilities chapter draws on information in Apple
Valley’s WSDP and WECP to provide the information
needed in the 2030 Comprehensive Plan.
Water Treatment
Existing System
Customer
Gallons Per
Year
% of Total
Annual Use
Water Use
Minnesota Zoo
59,475,000
0.0299
Table 9.10 describes the characteristics of water use in
Apple Valley from 1996 to 2005. Some changes highlighted by this information include:
CP Limited Partnership
46,690,000
0.0234
Augustana Health Care Center
9,440,000
0.0047
Eastview High School Sprinkler A
9,056,000
0.0045
ŠŠ
Total connections grew by 2,636, an increase of
22%.
Eastview High School Sprinkler B
9,000,000
0.0045
ŠŠ
Total water sold increased at a slower rate of 14%.
Paradise Car Wash
5,951,000
0.003
ŠŠ
Kingston Green Apartments
5,861,000
0.0029
The amount of unaccounted for water (total pumped
minus total sold) grew over this period.
Wirsbo
5,528,000
0.0028
ŠŠ
Residential water use per capita varied during this
period from a high of 100 gallons (2003) to a low of
83 gallons (2002 and 2005).
Apple Valley Villa
4,845,000
0.0024
Apple Valley Estates
4,516,000
0.0023
Large Volume Users
Table 9.11
October 2009
Utilities 9-11
clearwell, water flows by gravity to the pumping chamber
and is pumped to the distribution system and reservoirs.
Iron and manganese trapped on the filter media are removed by a process called backwashing, where the flow of
water is reversed though the filter media and air is introduced. The water from the backwash process is diverted
into one of four backwash tanks. Backwash water is held
in the tanks for approximately 10 hours allowing the iron
and manganese to settle to the bottom of the tank. After
this time, the recycle pumps carry the clear water back to
the head of the plant. Every third time a backwash tank
is utilized, the iron and manganese sludge is pumped into
the sanitary sewer system.
The iron and manganese sludge is subject to annual testing for pH, total suspended solids, and chemical oxygen
demand by the Metropolitan Council of Environmental
Services. Additional testing is done as required.
The WTP was designed to treat 12 million gallons per
day (MGD). In 1997, a filter bypass line was added so a
portion of the flow can be diverted around the filter cells
if usage is expected to exceed the design capacity. The
bypass water is blended with the treated water prior to the
chemical addition of chlorine and fluoride. The remaining
portion of the treatment process is identical.
By utilizing the bypass and increasing the backwashing
frequency it is possible to produce more than the designed
12 MGD. Under ideal circumstances, a maximum of 19
to 20 MGD can be processed at the WTP. This can be
further augmented by utilizing emergency backup wells
which pump water directly into the distribution system.
9-12 | Utilities
Well # or name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Unique Well
Number
205824
205825
205812
205812
207677
127263
127277
127297
151561
151563
191943
449257
433284
509056
519953
205823
603075
674495
731113
Year Installed
1963
1964
1962
1971
1974
1976
1977
1979
1981
1982
1985
1989
1989
1990
1993
2000
2001
2004
2006
Well/Casing Well Diameter
Capacity (GPM)
Depth (ft)
(in)
505/445
10
600
492/431
16
900
536/481
12
1,000
487/402
16
1,200
478/425
16
1,300
490/427
16
1,200
485/407
16
1,250
485/427
16
1,200
508/432
16
1,100
474/422
16
1,200
480/408
18
1,400
495/406
18
1,400
512/420
18
1,500
1121/857
14
900
1119/863
16
900
434/223
16
1,300
487/414
18
1,700
490/416
18
1,800
Geologic Unit
Status
Jordan
Jordan
Jordan
Jordan
Jordan
Jordan
Jordan
Jordan
Jordan
Jordan
Jordan
Jordan
Jordan
Mt. Simon
Mt. Simon
Jordan
Jordan
Jordan
Jordan
Emergency
Emergency
Emergency
Active use
Active use
Active use
Active use
Active use
Active use
Active use
Active use
Active use
Active use
Emergency
Emergency
Active use
Active use
Active use
Active use
Status: Active use, Emergency, Standby, Seasonal, Peak use, etc. GPM – Gallons per Minute
Geologic Unit: Name of formation(s), which supplies water to the well
Groundwater Sources
Table 9.12
Water Sources
The Apple Valley water system is supplied by nineteen
wells. Fourteen of the wells are in active use and the remaining five are used on an emergency basis. The characteristics
of the municipal wells are listed in Table 9.12.
The water system has a total storage capacity of 14,700,000
gallons consisting of one elevated storage (1,500,000 gallons), four ground storage (11,200,000 gallons), and one
clearwell (2,000,000 gallons).
October 2009
The water system has a total capacity (of sources) of 21,600
gallons per minute and a firm capacity (largest pump out
of service) of 18,000 gallons per minute.
Apple Valley’s water system does not utilize any surface
water sources or any wholesale or retail interconnections
with other cities.
City of Apple Valley
Water Supply Capacity (GPM/
System
MGD)
Rosemount
– Evermoor
Parkway
Rosemount –
Diamond Path
Elementary
Rosemount –
Dove Trail
Lakeville
– Granada
Avenue
Burnsville –
County Road 11
Limitations on Use
0.5 million
gallons
Subject to water availability.
Utilized only with prior
authorization & coordination with
requesting city.
0.5 million
gallons
Same as above
0.5 million
gallons
Same as above
0.5 million
gallons
Same as above
0.25 to 0.5
Same as above
Million gallons
GPM – Gallons per Minute
MGD – Million Gallons per Day
Emergency Interconnections
Table 9.13
elevation adjustments may be necessary to facilitate the
flow of water from one community to another.
Emergency Interconnections
Figure 9.4
Emergency Interconnections
Under emergency conditions, Apple Valley could provide
approximately 2 million gallons of water to Rosemount and
Lakeville through the interconnections in the low pressure
2030 Comprehensive Plan
zone. Although unlikely, it is possible to provide 1.5 million
gallons to Rosemount and 0.5 million gallons to Lakeville
simultaneously. This is dependent on the elevation of the
reservoirs of each City at the time. Some minor water
October 2009
The Apple Valley-Burnsville interconnection is in Apple
Valley’s high pressure zone. Under emergency conditions,
it would be possible to provide a flow rate of 0.25 to 0.5
MGD to this community. Again, this is dependent on the
reservoir elevations.
Rosemount, Lakeville, and Burnsville are all able to supply
water to Apple Valley. To utilize the interconnections, each
City would need to evaluate their system needs to ensure
adequate water for domestic and fire use.
Utilities 9-13
Year
Population
Served
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2020
2030
52,585
54,871
57,157
59,443
61,727
62,546
63,365
64,184
65,003
65,822
66,641
69,100
71,200
MGD – Million Gallons per Day
Average Day Maximum Projected
Demand Day Demand Demand
(MGD)
(MGD)
(MGY)
7.1
7.5
7.8
8.1
8.4
8.5
8.6
8.7
8.8
9
9.1
9.4
9.7
18.8
18.8
19.5
20.3
21
21.3
21.5
21.8
22
22.5
22.7
23.5
24.2
2,591
2,738
2,847
2,957
3,066
3,103
3,139
3,176
3,212
3,285
3,307
3,431
3,541
MGY – Million Gallons per Year
Ten Year Demand Projections
Table 9.14
Demand Projections
The average daily demand is based on the average per capita
consumption per day for the last five years. The average
daily demand is 136 GPD per capita. (The average residential per capita consumption is 83 GPD).
The maximum day demand is based on actual peak day
demand in 2006 (see Table 9.14). The maximum day demand for the subsequent years are based on a calculation
of 2.5 times the average day demand.
The projected demand is based on the average day demand
times 365 days per year.
Well #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Unique
well
number
205824
205825
205812
205812
207677
127263
127277
127297
151561
151563
191943
449257
433284
509056
519953
205823
603075
674495
731113
Frequency of
Method of
Type of well
Measurement Measurement
(production,
(daily, monthly (steel tape,
observation)
etc.)
SCADA etc.)
Production
Production
Production
Production
Production
Production
Production
Production
Production
Production
Production
Production
Production
Production
Production
Production
Production
Production
Production
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Sounder
Sounder
Sounder
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
SCADA
Monitoring Wells
Table 9.15
Well 1
Well 2
Well 3
Well 4
Well 5
Well 6
Well 7
Well 8
Well 9
Well 10
Well 11
Well 12
Well 13
Well 14*
Well 15*
Well 16
Well 17
Well 18
Total - gpm
Total minus *
Firm capacity
Normal
Pumping Operations
GPM
MGD
600
0.9
900
1.3
1,000
1.4
1,200
1.7
1,300
1.9
1,200
1.7
1,250
1.8
1,200
1.7
1,100
1.6
1,200
1.8
1,400
2
1,400
2
1,500
2.2
900
1.3
900
1.3
1,300
1.9
1,700
2.5
1,800
2.6
21,850
20,050
18,700
Summer Active
Pumping Operations
GPM
MGD
600
0.9
900
1.3
1,000
1.4
1,200
1.7
1,100
1.6
1,200
1.7
750
1.1
1,000
1.4
900
1.3
900
1.3
1,300
1.9
1,300
1.9
1,400
2
900
1.3
900
1.3
800
1.2
1,400
2
1,600
2.3
19,150
17,350
15,750
* Mt. Simon/Hinkley Aquifer – slated for emergency use only, not summer peaking.
Firm capacity – largest pump out of service.
Pumping Operations
Resource Sustainability
The concept of sustainable water use is the use of water
to provide for the needs of society, now and in the future,
without unacceptable social, economic, or environmental
consequences.
The current system of municipal wells is listed in Table
9.15. Water levels are monitored monthly.
9-14 | Utilities
Well
October 2009
Table 9.16
Pumping demands vary greatly between winter and summer, being directly effected by the amount of precipitation
received. The wells are located within a single well field with
the WTP located in the center. The exceptions are Wells 1,
2, and 3 which do not pump to the WTP, but pump directly
into the distribution system due to their distance from the
City of Apple Valley
WTP. These wells are reserved for use during high water
usage or emergency situations. The well locations can be
found in Figure 9.5.
Well interference is evident when all the wells are running or multiple wells within proximity to each other are
running. Table 9.16 shows the GPM difference between
normal pumping operations and active pumping operations
during summer high water demand conditions.
The demand for water can be managed by implementing
water restrictions, encouraging conservation, rate structure
and educating residents.
Natural Resource Impacts
There are no natural resource features in the immediate
vicinity of Apple Valley that would be affected by ground
water withdrawals.
The static depth of the water in the Apple Valley wells
shows that the aquifers used are not hydraulically connected
with nearby water resources (i.e. the hydraulic head in the
aquifers is far below the ground surface). The fens and
trout streams in the Minnesota River Valley (MRV) and
the Vermillion River are far enough away that they do not
appear to be a concern.
The fen nearest to Apple Valley has already been degraded
by dewatering at the Seneca wastewater treatment plant,
and trout haven’t been verified in the small “trout streams”
in the MRV since 1982. Eagle Creek, which is quite far
from Apple Valley, is probably the only real trout stream
in the MRV.
The Vermillion River is less dependent on bedrock aquifers than other areas because a laterally extensive surficial
aquifer surrounds it. The Vermillion River is a designated
2030 Comprehensive Plan
trout stream in the Mississippi River watershed. Trout have
also been found in South Creek and where the South and
North Creek intersect. These creeks are located south of
Apple Valley in Farmington and should not be impacted
by ground water withdrawals.
Sustainability
The Jordan aquifer appears to have sufficient capacity to
sustain the projected demands. No increases in withdrawals from the Mt. Simon aquifer are planned.
Projected demands for 2008 were applied to a modified
version of the Dakota County ground-water model for
the City of Apple Valley Wellhead Protection Plan Phase
1 ( January 2003) and Phase 2 (May 2004), indicating that
given the model assumptions, projected 2008 withdrawals
can be supplied by the Jordan aquifer.
No modeling or analyses have been performed specifically
to estimate the impacts of projected pumping rates greater
than those projected for 2008. However, an analysis was
performed in 1996 to determine whether the locations of
future Wells 16 and 17 would cause interference with existing wells.. Sites located along the outer edges of the current
well field showed the greatest potential for development.
Records of water levels in the older Jordan aquifer production wells indicate that static water levels in the production wells are somewhat lower than the static level when
constructed. However, static water levels are influenced by
one or more other production wells. There is not a clear
indication of excessive, long-term drawdown.
The Dakota County Department of Environmental
Services has extensive groundwater information on the
municipal and private wells within the county. The City
has no observation wells completed in the Jordan or Mt.
Simon aquifers.
Capital Improvements Plan
Apple Valley has followed a systematic approach to expansion of the water pumping and distribution system. This
approach has been outlined in the 1969 and 1975 Water
Supply and Distribution Engineering Study and Report
and in the 1981, 1991, 1995, and 2002 Water Supply
and Distribution System Plans and will continue as the
population and water demands increase. The plans will
be evaluated and adjusted as necessary to accommodate
the growth and development of the City.
A capital improvement plan (CIP) is in place to help plan
for the expansion and repair of the water production and
distribution system, which includes the water treatment
Year
Well
Geologic
formation
2009
Well 20
Jordan
2011
Well 21
Jordan
2013
Well 22
Jordan
2015
Well 23
Jordan
Proposed
pumping
capacity
(demand)
1,400 – 1,800
gpm
Location
Energy Way
Johnny Cake
Ridge Road and
County Road 42
137th Street
and Ferris
Avenue - Faith
Park
Johnny Cake
Ridge Road,
SE corner of
Aquatic Center
lot
1,400 – 1,800
gpm
1,400 – 1,800
gpm
1,400 – 1,800
gpm
Capital Improvements Plan
Table 9.17
October 2009
Utilities 9-15
Wells and Reservoirs
Figure 9.5
9-16 | Utilities
October 2009
City of Apple Valley
Water Source Alternatives
A water treatment plant has been proposed for the Kramer
gravel pit in Burnsville. The water treatment plant would
take water withdrawn in the gravel operation’s dewatering
process and treat it for municipal use rather than discharging it into the Minnesota River. Although the City of
Apple Valley is not a participant in the plant proposal, an
interconnect with the City of Burnsville is in place which
could be utilized in an emergency situation.
Preventative Maintenance
Preventative maintenance is extremely important in the life
of a water supply and distribution system. Preventative
maintenance is scheduled as follows:
ŠŠ
Production wells pulled every 7 years.
ŠŠ
Water treatment plant (WTP) high service pumps
pulled every 8 years.
ŠŠ
Leak detection on cast iron pipe, overlay areas, etc. annual inspections.
ŠŠ
Valve operation program - scheduled as time permits.
ŠŠ
Hydrant flushing and inspection program - semiannual program spring and fall
ŠŠ
Reservoir maintenance: warranty inspection at 2
years, touch up repairs at 7 to 10 years, total reconditioning at 20 years. Cathodic protection at selected
sites - annual check.
ŠŠ
Valve, meter, equipment, etc. upgrades and replacements are budgeted and scheduled as necessary.
Future Wells
Figure 9.6
plant, wells, and water towers. The CIP is evaluated and
adjusted annually. Table 9.17 contains the anticipated
capital improvements plan for new wells. The location of
the proposed well sites is shown in Figure 9.6.
2030 Comprehensive Plan
These additions are necessary to serve Apple Valley’s
future population which is expected to increase from approximately 50,000 to over 70,000 residents at ultimate
development.
October 2009
Utilities 9-17
Emergency Response Plan
Water emergencies can occur as a result of vandalism,
sabotage, accidental contamination, mechanical problems,
power failures, drought, flooding, and other natural disasters. The purpose of emergency planning is to develop
emergency response procedures and to identify actions
needed to improve emergency preparedness.
The City has adopted a Water Emergency and Conservation Plan that contains procedures dealing with water
emergencies. The WECP will be used as the guide for
establishing procedures and water supply protection measures in accordance with state and federal regulations.
Water Conservation Plan
Water conservation programs are intended to reduce
demand for water, improve the efficiency in use and reduce losses and waste of water. Long‑term conservation
measures that improve overall water use efficiencies can
help reduce the need for short-term conservation measures. Water conservation is an important part of water
resource management and can also help utility managers
satisfy the ever‑increasing demands being placed on water
resources.
Minnesota Statutes 103G.291, requires public water suppliers to implement demand reduction measures before
seeking approvals to construct new wells or increases in
authorized volumes of water. Minnesota Rules 6115.0770,
require water users to employ the best available means and
practices to promote the efficient use of water. The City
uses its WECP to meet these requirements.
Procedures that will be employed to reduce unaccounted
water include:
1. Test well meters when well is pulled for maintenance
or more frequently if necessary.
2. Employ meter testing program for WTP meters.
3. Employ large meter (2” or larger) testing program.
4. Employ residential and small commercial account
testing program.
5. Determine additional sources for unaccountable
water.
6. Determine if methods of estimating unaccountable
water are accurate.
3. Provide public information and awareness through
participation in local events such as the Home & Garden Show and Earth Day at the Minnesota Zoo.
4. Continue tree preservation requirements of Natural
Resources Management Ordinance §152:23.
5. Review and amend related ordinances as needed.
6. Continue enforcement of water restrictions.
7. Increase education of those who use irrigation systems.
8. Watering restrictions that prohibit sprinkling between
certain periods of the day in the summer and fall.
7. Review monthly form completed by Parks, Fire,
Streets and Utilities for unmetered water.
8. Review estimates used for hydrant flushing and water
breaks and leaks.
9. Review meter readings from wells and WTP. The
readings from wells, WTP raw water meter and WTP
high and low zone pumps show a difference in flow
volume. This may be due to meter accuracy, meter
type, or calibration.
10. Complete AWWA Water Audit Worksheet to determine potential water loss sources.
11. Review billing accounts to see if errors exist.
Procedures that will be used to reduce peak water demands
include:
1. Review and evaluate water rate structure to promote
efficient use and conservation of water resources.
2. Increase education of residents and businesses.
9-18 | Utilities
October 2009
City of Apple Valley
Surface Water Management
The City of Apple Valley has adopted a comprehensive
Surface Water Management Plan (SWMP) to serve as a
guide to managing the surface water system throughout
the city. The overall purpose of the SWMP is to develop
a framework for sustaining the long-term integrity of the
community’s surface waters and maintain ongoing compliance with surface water regulations. The SWMP identifies
system improvements and other actions that will improve
the integrity of Apple Valley’s surface waters. This section
of the Utilities chapter summarizes key elements of the
SWMP and approved addenda for inclusion in the 2030
Comprehensive Plan.
Existing System
One of the major challenges of water resources protection
and improvement in a nearly fully developed community
like Apple Valley is dealing with the effects of the existing storm drainage infrastructure. Comprehensive storm
drainage planning efforts in the mid-1980’s helped Apple
Area
Valley to develop into one of the largest Twin Cities Metro
area communities. These efforts were made during a time
when flood protection was the order of the day across the
nation and when the impacts of stormwater runoff on water
quality were barely recognized.
ŠŠ
Major differences between the current analysis and
1997.
ŠŠ
Any significant changes in High Water Levels compared to the 1997 plan and the reason why those
changes occurred.
While the SWMP addresses flood management and protection as well as water quality and wetlands management,
some of the most challenging issues have to do with protection of the City’s lakes and management of stormwater
quality. Degradation is in many cases directly related to a
largely irreversible system configuration that routes runoff
from urbanized areas through these water features.
ŠŠ
Major modeling findings and stormwater behavior.
ŠŠ
Identification of operational issues, including which
ponds exhibit High Water Levels for extended periods
of time.
The surface water management system consists of seven
areas as described in Table 9.18 and Figure 9.7. The
SWMP contains the following information about each of
these districts:
ŠŠ
Location and names of designated stormwater ponds
and lakes.
ŠŠ
Names and boundary locations of major and minor
watersheds.
ŠŠ
ŠŠ
Stormwater trunk lines connecting the ponding
areas.
Location, land use, and major drainage features of
the district.
Drainage Area
The map in Figure 9.7 depicts the following characteristics
of the storm drainage areas:
No. of Ponds (including lakes)
73
97
16
27
None other than Lac Lavon
3
Major Lakes
East Vermillion River District
West Vermillion River (WVR) District
Alimagnet Lake District
Black Dog District
Lac Lavon District
Keller Lake District
3,628 acres (3,623 acres in Apple Valley)
4,880 acres (4,814 acres in Apple Valley, remainder in Lakeville)
1,258 acres (489 acres in Apple Valley)
440 acres
187 acres (157 acres in Apple Valley)
1,479 acres (824 acres in Apple Valley)
Northern Non-contributing Areas
885 acres (Including the Minnesota Zoological Gardens, Lebanon Hills 2 (1 in Lebanon Hills Regional Park proposed
Regional Park, Valleywood Municipal Golf Course, and the Beckman to drain to Apple Valley, and 1 located in the None
Addition)
MN Zoo)
Lift Stations
3 – Long, Farquar, and Cobblestone Lakes
None
1 – Alimagnet Lake (shared with Burnsville)
None
Lac Lavon
1 – Keller Lake (shared with Burnsville)
2
5
1
2
None
None
1 temporary
and 1
proposed
Storm Drainage Areas
Table 9.18
2030 Comprehensive Plan
October 2009
Utilities 9-19
Storm Drainage Areas
Figure 9.7
9-20 | Utilities
October 2009
City of Apple Valley
Storm Drainage System
Figure 9.8
2030 Comprehensive Plan
October 2009
Utilities 9-21
ŠŠ
Locations where stormwater in the City’s storm drainage system is discharged to an adjacent community.
The map in Figure 9.8 illustrates the components of the
storm drainage system. This map includes the following
information:
ŠŠ
Major watershed boundaries.
ŠŠ
Location and names of designated stormwater ponds
and lakes with Control Water Level (CWL) and High
Water Level (HWL) annotations.
ŠŠ
Stormwater trunk lines connecting ponds with flow
direction and pipe sizes.
ŠŠ
Lift station lines with flow direction and pipe sizes.
ŠŠ
Structure locations.
ŠŠ
Locations where stormwater in the City’s storm drainage system is discharged to an adjacent community.
Other Agencies
When it comes to stormwater management and wetland
protection, there are other agencies with whom the City
must interact and coordinate. Among the most significant
are:
Metropolitan Council. This regional planning agency
has long focused on stormwater quality improvement in
municipalities of the seven county Metro area. Updated
stormwater management plans for all communities in
the Metro area will be needed to support the community
comprehensive plan updates that are due in 2009.
Board of Water and Soil Resources (BWSR). This agency
oversees administration of the state Wetlands Conservation Act (WCA) by local governments and must approve
any local wetland management plan developed by a local
government.
9-22 | Utilities
Minnesota Department of Natural Resources (MDNR).
This agency has major responsibilities in the management
of designated public waters, including development of public access, fisheries management, and water level control.
Minnesota Pollution Control Agency (MPCA). This
agency has wide-ranging and high profile regulatory,
research, and planning responsibilities for implementing
the federal Total Maximum Daily Load (TMDL) and
National Pollution Discharge Elimination System (NPDES) programs.
Vermillion River Watershed Joint Powers Organization
(VRWJPO). This local water management organization
was established in 2002, and covers almost 90% of the
City of Apple Valley within its jurisdictional boundary.
The VRWJPO adopted a watershed plan in November
of 2005 and is in the process of developing standards and
rules to implement that plan.
Black Dog Watershed Management Organization (BDWMO). This local water management organization was
formed in 1985. The BDWMO includes about 8% of
the City of Apple Valley, including Lac Lavon and Keller
Lake and those portions of the City draining to these two
resources.
These agencies rely on the cooperation of local governments
like the City of Apple Valley to help meet their goals and
mandates, although several have regulatory authority as
well. Many of these organizations also offer technical and/
or financial assistance that is of value to the City. Representatives from the organizations above were included on
the Interagency Committee which gave valuable guidance
in the development of the Apple Valley Surface Water
Management Plan.
October 2009
Goals and Policies
Surface water management is a very strong component of
the City’s overall approach to protecting and preserving the
community’s natural resources. The City of Apple Valley
recognizes both the value and impact that surface water can
have on the quality of life in the community. In general, the
goals and policies presented in the SWMP set expectations
for management with regard to:
ŠŠ
The conditions to be achieved in the water resources
of the City;
ŠŠ
The requirements and performance standards that
need to be met for certain types of activities;
ŠŠ
How the City will interact with other management
and regulatory organizations and their requirements
and objectives; and
ŠŠ
How the City will allocate its own resources for water
resources management.
The goals contained in the City’s Surface Water Management Plan are listed below:
Goal 1: Provide adequate flood protection for residents
and structures by adopting and implementing standards
that meet or exceed regulatory requirements.
Goal 2: Manage surface water resources using scientificallybased, common sense approaches that meet or exceed
regulatory requirements.
Goal 3: Control watershed loadings to help meet or exceed
surface water quality requirements.
Goal 4: Manage wetlands in compliance with all regulations
and according to Community’s values and priorities.
City of Apple Valley
Goal 5: Protect surface water resources from impacts of
land development and redevelopment activities.
Key Implementation Elements
The real measure of success of the updated SWMP will
be its implementation. A community-wide comprehensive
plan like this one plays a valuable role in setting standards
for affected parties, identifying priorities, defining expectations, and providing guidance and direction on key issues.
Following is a brief summary of the key implementation
elements in this SWMP.
Requirements for New and Redevelopment
Activities
The increase in impervious cover, associated with new
and redevelopment activities, is a primary factor behind
increases in surface runoff and pollutant loading to the
City’s lakes and wetlands. Apple Valley’s SWMP requires
new and redevelopment activity creating more than 0.2
acres of new impervious surface to achieve, at a minimum,
no-net-increase in annual runoff volume and the amount
of two key pollutants – phosphorus and suspended solids
– compared to the pre-development condition.
The SWMP also proposes revised freeboard standards to
address flood protection and meet watershed organization
requirements. These standards require that there be at least
one foot of freeboard between the established High Water
Level (HWL) of a designated ponding area and the minimum elevation of an adjacent building. Further, a minimum
three-foot freeboard will continue to be required between
the lowest exposed entry of a building and the HWL of
an adjacent designated ponding area. The flood risk will be
based on the more critical of these two conditions.
NPDES and TMDL Requirements
In 2003, as part of the Clean Water Act, the U.S. Environmental Protection Agency began requiring municipalities
to obtain permits to discharge stormwater. In Minnesota,
the MPCA administers these permits under the NPDES
Municipal Separate Storm Sewer System (MS4) program.
The five-year NPDES Permit obtained by the City in 2003
required preparation of a Stormwater Pollution Prevention
Plan (SWPPP) and submission of an Annual Report. Each
annual report must summarize the following:
ŠŠ
As part of meeting these requirements, the City will increase its efforts to pre-treat and infiltrate runoff where
conditions allow, either in on-site features or in regional
features. These measures will enhance groundwater recharge, decrease the burden on the storm drainage system,
and minimize the pollutant loads reaching high priority
downstream waterbodies.
Compliance with permit conditions, including an
assessment of the appropriateness of identified management practices and progress towards achieving
identified measurable goals for six minimum control
measures.
ŠŠ
Planned stormwater management activities during the
next reporting cycle.
ŠŠ
Changes in identified management practices or measurable goals for any of the control measures.
The City will provide guidance to developers to meet these
requirements, but developers will be responsible to incorporate into their site design such practices as are necessary
to meet the above performance standards.
Every two years, the U. S. Environmental Protections
Agency under the authority of the federal Clean Water Act
requires each state to publish an updated list of streams and
lakes that are not meeting their designated uses because of
2030 Comprehensive Plan
October 2009
excess pollutants or degraded biological conditions. The
Impaired Waters List – also known as the 303(d) list – is
based on violations of state water quality standards and is
organized by river basin. For a surface water to be listed,
historical monitoring and assessment must indicate it is
impaired by one or more pollutants.
Once the MPCA assigns a surface water to the 303(d)
list, it requires a detailed strategy be developed and
implemented within a specific time frame to meet water
quality standards. This strategy is commonly known as a
Total Maximum Daily Load (TMDL) study or plan. A
TMDL study identifies both point and nonpoint sources
of each pollutant that is causing impairment of a surface
water. Water quality monitoring and modeling techniques
are used to determine how much each pollutant must be
reduced to assure the water quality standard is met. Five
Apple Valley lakes are on the 2008 Impaired Waters List
(Alimagnet, Farquar, Keller, LacLavon, and Long).
The City will generally take the lead to complete and
implement TMDLs for impaired waters due to excess
nutrients where the watersheds are located wholly within
City boundaries. For impaired waters in the City whose
watersheds extend into adjacent communities, the City may
request the appropriate watershed management authority
either take the lead (with the City participating as needed)
or co-facilitate the completion and implementation of the
TMDL. The City of Burnsville has expressed interest in
partnering with the City of Apple Valley and the appropriate Watershed Management Organization to initiate
TMDL studies on Lake Alimagnet and Keller Lakes which
are shared by both Cities. For TMDLs that have regional
implications (e.g., the Lake Pepin excess nutrients and
turbidity impairments, the Vermillion River Fecal coliform
Utilities 9-23
bacteria impairment, or mercury-related impairments), the
City will cooperate with lead agencies as appropriate.
Wetland Management and Protection
Wetlands provide a variety of services (called “functions”)
valued by the City and its residents. Wetlands are a critical
part of the natural storm drainage system in the City of
Apple Valley, and help to maintain water quality, reduce
flooding and erosion, provide habitat for wildlife, and
provide open spaces and natural landscapes that City
residents enjoy.
The goal of the wetland management section of the SWMP
is to prioritize and guide management of Apple Valley’s
wetlands based on their functions and values to the community. Standards for protection and enhancement of
wetland resources included in the SWMP are prioritized
on this basis. Because the functions and values provided
by different wetlands vary, the SWMP presents an assessment and classification system that will assist the City in
establishing priorities and focusing available resources for
wetland protection, enhancement and restoration. Fifty
wetlands, including all within the Black Dog Watershed
Management Organization and a number of others elsewhere in the City that are located in public areas, were
selected by the City to apply the classification system. This
same technical approach will be used to assess and classify
the remaining wetlands. Because all wetlands provide some
functional values, all are protected to some degree under
provisions in the SWMP.
The SWMP provides the following benefits related to
wetlands:
ŠŠ
Includes wetland inventory, assessment, and management guidelines.
9-24 | Utilities
ŠŠ
Allows appropriate use of wetlands to preserve water
quality and prevent downstream flooding.
end points, as necessary and if assessments are contrary to
expected outcomes.
ŠŠ
Enhances wildlife values of wetlands.
ŠŠ
Identifies potential wetland enhancement/restoration projects, emphasizing those wetlands that are in
public space.
ŠŠ
Guides management of wetlands by their sensitivity
to stormwater.
The City’s understanding of how lakes function as well as
the development of tools to manage lakes has improved dramatically over the last 15 years. If anything, our knowledge
of how these systems work and how to manage them will
likely accelerate over the next 10-15 years. The City staff
must keep abreast of these developments and pursue those
of merit to achieve the goals in this SWMP.
Regulation of activities that may impact individual wetlands will be based on evaluations of proposed activities,
site-specific wetland boundary delineations, and wetland
management classifications.
Priority Lake Designation and
Management
Through this revised SWMP, five priority lakes were
identified, taking into account such factors as size and
public access to the water body. Protecting and managing
water quality in these lakes is a primary objective of this
SWMP. As part of this strategy, the City has developed
a customized lake classification system with measurable
water quality goals for each lake. When met, those goals
will assure that a specific lake will also meet proposed state
standards as well as watershed management organization
requirements.
The City recognizes lakes as complex systems whose responses to numerous natural and unnatural variables are
difficult to predict. Furthermore, there are never enough
data to eliminate uncertainty. Adaptive lake management
emphasizes assessing the impacts of management actions
to a reasonable extent and applying lessons learned to guide
future actions, as progress is made toward goals. Adaptive
management also implies a willingness to change desired
October 2009
Public Education
Education serves an important role in enabling Apple Valley to implement its stormwater, lake water quality, and
wetland management programs successfully.
The following principles will guide the City’s future efforts in water resources education, as summarized briefly
below:
1. Allocate educational effort appropriately. In general,
a base level of effort will be applied everywhere in the
community, but extra effort will be directed in known
“hot spots,” areas with high loading risks to priority
water bodies.
2. Good public education generates and sustains
program support. Water resources education raises
awareness of problems and offers opportunities to
show the City is solving those problems. These efforts
also can foster productive working partnerships with
groups of interested citizens, which can generate even
more support and visibility for protection efforts.
3. Promote use to raise awareness. Efforts to increase
the use and enjoyment of the community’s water
resources help to increase support for taking care of
those resources.
City of Apple Valley
4. Although important, public education is only a
small part of solving water quality problems. Fundamental alterations in drainage patterns and land
use in Apple Valley require technical solutions to be
combined with public education to achieve positive
and effective results.
Target audiences for the education program are:
ŠŠ
City Staff. It is essential for the success of the program
that City staff set a good example to the community’s
residents, businesses, and customers in carrying out
their duties in a way that protects the City’s water
resources consistent with the SWMP.
ŠŠ
City Residents. The goal is that city residents be well
educated about, actively involved in, and regularly supportive of SWMP policies and programs.
ŠŠ
The Development Community. It is important that
City developers are knowledgeable about, and willing partners with, the City on SWMP policies and
programs.
System Improvement Program
The system improvement program in the SWMP provides
a prioritized blueprint for actions or projects to carry out
SWMP goals and policies. The improvement program is
organized into four groups of projects:
ŠŠ
General/Administrative
ŠŠ
Water Quantity/Flood Control
ŠŠ
Water Quality
ŠŠ
Wetlands
General/Administrative. These actions relate to development, evaluation, and revision of ordinances and policies for
land use that can have major impacts on water resources.
2030 Comprehensive Plan
These improvements also include citywide planning and
study efforts that are required by other authorities, such
as the nondegradation provisions of the NPDES MS4
permit.
Water Quantity/Flood Control. Some of the improvement elements in this section involve execution of improvements for which a technical assessment has been completed
and a preferred option identified.
A second category calls for conducting a feasibility assessment to evaluate options and select a preferred alternative
to address known problems. Finally, a broader pro-active
flood risk assessment and prioritization of problem areas
is called for to determine whether there are other areas of
the City where flood protection standards are not met.
Those areas will then be prioritized depending on their
degree of risk and a more detailed evaluation will be done
as resources allow finding solutions.
elements of those plans. As the City completes successive
plans, it will spend decreasing amounts of time and effort
developing plans and increasing levels of time and effort
implementing recommended measures in the plans. To
reflect its future directions, the City should update the
water quality improvement program each year.
Wetlands. These activities reflect the City’s intention to
systematically pursue wetland restoration and enhancement, especially for wetlands in public space.
Water Quality. The first element of this part of the
implementation program is to execute improvements that
have already been identified through completed planning
efforts, such as those for Keller Lake, Lake Alimagnet,
and Lac Lavon. Equally important, the City will pursue
development of lake management plans and implementation programs on remaining designated high priority lakes,
often as part of the development of TMDL’s for those
waters when they are listed. Lake management plans are
feasibility studies for specific lakes that will evaluate the
costs and benefits of management alternatives and then
provide specific costs and design guidance for recommended capital improvements as well as non-structural
management activities.
As part of implementing the overall lake management plans,
the City will need to carry out the capital improvement
October 2009
Utilities 9-25
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9-26 | Utilities
October 2009
City of Apple Valley