HomeMy WebLinkAboutItem 9 - CC Agenda Item #9 Lake Elmo Comprehensive Plan Chapter VI— Wastewater Facilities
WASTEWATER FACILITIES
Sanitary Sewer System
Background
The City of Lake Elmo's sewer plan is based on the Memorandum of Understanding approved by the City
of Lake Elmo and the Metropolitan Council dated January 27, 2005 and as subsequently amended.This
plan meets the intent of that agreement and has been drafted to comply with the housing, population,
and employment projections as incorporated into the Land Use Plan.
Existing Sanitary Sewer
The Southeast 1/4 of Section 33 is within the Metropolitan Urban Service Area (MUSA) Boundary at this
time. By agreement with the City of Oakdale this area discharges to a City of Oakdale sanitary sewer
main in Hudson Boulevard. From there it enters the WONE interceptor. Under the agreement with the
City of Oakdale, Lake Elmo is limited to the amount it can discharge.
Sanitary Sewer Plan
The MCES plans to extend a new sewer connection for the City of Lake Elmo to serve the east 1/2 of
Section 33 and all of Section 34. The connection will be near the City's existing lift station, and that lift
station will continue to be active and maintained by the City.
Additionally,the MCES will extend the Cottage Grove Ravine interceptor to serve the remainder of the
City south of 10th Street and the Village Planning Area.
The City will install a lift station-forcemain system to covey wastewater to the MCES interceptor from
the Village Planning Area.This lift station-forcemain system will be designed to serve the planned 900
new housing units and approximately 200 existing housing units. The City plans to build this system in
2013.
Sanitary sewer service will also be initiated to serve portions of the City south of 10th Street beginning
in 2013 by extending gravity sewer in two locations. In the southeast side of Lake Elmo, gravity sewer
will be connected to the MCES Cottage Grove Ravine Meter Station in Lake Elmo, and extended north to
support development in the immediate area of the sewer main. In the southwest side of Lake Elmo, a
gravity sewer and lift station-forcemain system will be constructed to support development in the
remaining east%of Section 33 and in Section 34.
The existing units in the Cimarron manufactured home park will be served by regional sewer between
2020 and 2030. This flow is included in the forecasts. Cimarron will need to install a lift station in order
to be served by regional sewer.The existing homes and businesses in the Village Planning Area of Lake
Elmo are assumed to be served by regional sewer between 2013 and 2030.That flow has also been
included in the forecasts.
DRAFT 8126113 VI—1
Lake Elmo Comprehensive Plan Chapter VI— Wastewater Facilities
The City has identified an area along Olson Lake Trail in the Tri-Lakes area that will be served with public
sanitary sewer via an extension from the City of Oakdale. A sanitary sewer services agreement has been
entered to facilitate this extension.The City of Lake Elmo will work with the City of Oakdale to connect
existing homes as public projects occur or as when otherwise feasible to make these connections.
Requirements for Areas Served by the Regional System
Community Forecast for Areas Served by Regional Sewer Service (REC Units)
The following table provides projections of future sewer units (REC units) that will connect to the
regional interceptors, including all new sewer units and any existing units that are projected to connect
into the system.
Forecast of Lake Elmo REC Units by Sewer Interceptor
Year New REC Units Existing REC Units Total
WONE Cottage Grove WONE Cottage Grove
2010 0 0 100 0 100
2011 0 0 100 0 100
2012 0 0 100 0 100
2013 0 0 100 0 100
2014 60 40 100 0 200
2015 375 140 100 0 615
2016 520 326 130 20 996
2017 665 512 160 40 1377
2018 810 698 190 60 1758
2019 955 884 220 80 2139
2020 1100 1070 250 100 2520
2021 1200 1270 270 150 2890
2022 1300 1470 290 200 3260
2023 1400 1670 300 367 3737
2024 1500 1870 300 533 4203
2025 1600 2070 300 700 4670
2026 1600 2456 300 700 5056
2027 1600 2842 300 700 5442
2028 1600 3228 300 700 5828
2029 1600 3614 300 700 6214
2030 1600 4000 300 700 6600
DRAFT 8126113 VI-2
Lake Elmo Comprehensive Plan Chapter VI-Wastewater Facilities
Sanitary Sewer Plan Map
The Sewer Staging Plan Map (Map 6-1) shows sewer service staging in three phases in accordance with
the Land Use Plan.The staging plan will be revised to reflect any future updates to the Memorandum of
Understanding between the City and the Metropolitan Council.
The Sewer Service Area-Tri Lakes Map (Map 6-2) shows the sewer service area for existing homes to
be provided with service along Lake Olson. There is no specific time frame identified for this area, but
connections are expected to begin in 2013.
Projected Flows for Each MCES Interceptor Service Area (MGD)
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Projected Flows by •p i 1
Year WONE Cottage Grove Totals
2010 0.03 0.00 0.03
2014 0.04 0.01 0.05
2015 0.13 0.04 0.17
2016 0.18 0.09 0.27
2017 0.23 0.15 0.38
2018 0.27 0.21 0.48
2019 0.32 0.26 0.59
2020 0.37 0.32 0.69
2025 0.52 0.76 1.28
2030 0.52 1.29 1.81
Flows are based on 1 residential equivalent unit= 274 gallons per day
DRAFT 8126113 VI-3
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Lake Elmo Comprehensive Plan Chapter VI— Wastewater Facilities
Land Use Plan Map
The general plan for providing sanitary sewer to the planned service areas is described in Map 6-3.
City Goals,Policies and Strategies Concerning Infiltration and Inflow
The City of Lake Elmo's goal is to have no inflow or infiltration into its sewer system, and to attain the
goal of preventing and reducing excessive infiltration and inflow into the local sewer system the City will
observe the following procedures:
• All sewer mains will be air tested in accordance with the Minnesota City Engineers Association
Standards for Utility Construction.
• All new sewer mains will be televised.
• Homes and businesses will be checked for sump pump discharge into the sewer system prior to
issuance of a Certificate of Occupancy.
• The City will monitor its actual sewer flows during storm events to see if there is an increase in
sewer discharge.
• The City will develop a schedule to inspect and clean all sewers.
Should excessive inflow and infiltration be a concern in the future, the City will adopt additional policies
to remedy the situation.
Requirements for Areas Not Served by the Regional System
Description of the City's Current Management Program
The City has adopted Chapter 4:Subsurface Sewage Treatment System Regulations of the Washington
County Development Code by reference.A copy of the City's Ordinance and a description of the SSTS
monitoring system are included as an Appendix. Washington County currently monitors SSTS
installations and administers the code for the City.
Cimarron Manufactured Home Park operates and maintains a packaged treatment plant with a capacity
of 0.15 MGD.There is a State permit for this facility.
Map of Existing Public Septic Systems
Map 6-4 entitled Existing 201 Common Wastewater Systems identifies the City's existing public septic
systems.
Conditions Under Which Septic Systems Are Allowed
Septic Systems are allowed for all land uses within the City outside of the planned sewer service areas in
accordance with Chapter 4:Subsurface Sewage Treatment System Regulations of the Washington
County Development code as adopted by reference by the City of Lake Elmo.
Capacity and Flows to Public and Private Septic Systems
The capacity and flows to public and private septic systems are listed in Table 6-C and Table 6-13.
DRAFT 8126113 VI—6
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Lake Elmo Comprehensive Plan Chapter VI— Wastewater Facilities
Private Community Wastewater Treatment Systems
Map 6-5 Private Community Wastewater Treatment Systems shows the privately owned sewage
treatment systems that have been constructed in the City. These private systems have been built since
1998.The city at the time decided to allow"performance based" sewage treatment systems, in
accordance with Minnesota Rules 7080.To date, all of these private systems are located in new
residential subdivisions.The homeowners within these new subdivisions are responsible for ownership,
operation and maintenance.The Private Community Wastewater Treatment Systems consist of
"wetland treatment systems" or"community drainfield systems".
Systems over 10,000 gallons per day have a State Disposal Permit.
A list of the Private Community Wastewater Treatment Systems are incorporated as part of Table 6-C.
Table 6-C
Private Community Wastewater Treatment Systems
Subdivision Number of Homes Design Flow(GPD) State Permit
Fields of St. Croix 135 35,589 Yes
Tana Ridge 20 5,841 Yes
Tamarack Farm Estates 20 4,000 No
Hamlet on Sunfish Lake 41 8,200 Pending
Prairie Hamlet 14 2,800 No
Wildflower Shores 25 3,600 No
Carriage Station 111 44,875 Yes
Whistling Valley(1-III) 46 20,000 Yes
Tapestry 67 25,125 Yes
Farms of Lake Elmo 33 12,375 Yes
Discover Crossing 28 9,045 No
St. Croix's Sanctuary 62 20,000 Yes
Hidden Meadows Church & 25 Homes 13,375 Yes
City-Owned 201 Wastewater Treatment Systems
In the late 1980's,the City of Lake Elmo participated in the Federal 201 program which provided grant
funds to help communities build shared wastewater treatment systems. The City of Lake Elmo designed
and constructed eight (8) 201 shared wastewater treatment systems under this program to replace
failing septic systems on private property.The systems provided individual septic tanks for private
DRAFT 8126113 VI—8
Lake Elmo Comprehensive Plan Chapter VI— Wastewater Facilities
properties with shared wastewater drain fields and were constructed in the Old Village and Tri-Lakes
areas.
Map 6-5: Existing 201 Shared Wastewater Treatment Systems shows the location of these systems,
which include the following facilities:
Table 1
City-Owned 201 Wastewater Treatment Systems
Facility Number of Connections Design Flow(GPD)
Old Village Remote A 6 3,750
Old Village Remote B 6 2,700
Old Village Remote C 8 1,500
Old Village Remote D 6 4,440
Tri-Lakes Remote A 1 450
Tri-Lakes Remote B 3 1,500
Tri-Lakes Remote C 2 600
Tri-Lakes Remote D 3 1,350
Tri-Lakes Remote E 1 450
Future Sewer Plans
The City has no plans to expand the area served by the Regional Sewer System outside of the areas
shown in Map 6-1 Sewer Staging Plan Map except for those areas specified in the Tri-Lakes area and
depicted on Map 6-2 Sewer Service Area—Tri Lakes Map.The City will continue to work with the City of
Oakdale to potentially extend sewer services into the Tri-Lakes area to serve the future service areas
identified in this map. Within the planned Regional Sewer System,the City will abandon all City-owned
septic systems in the Village Area at the time of connection to sanitary sewer. The City does not plan to
construct a local sewage treatment plant.
Private sewage treatment systems may be constructed in new residential developments by developers
as necessary outside of the areas that have been guided for public sanitary sewer services. The
installation of new private systems will occur at the time new homes are built.
DRAFT 8126113 VI—9
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