4.2.a PCSR 05-23-2023
Request for Action
To Item Number
Planning Commission 4.2a
Agenda Section Meeting Date Prepared by
Public Hearings May 23, 2023 Chris Leeseberg, Senior Planner
Item Description Reviewed by
st
Waste Management – Elk River Landfill, 11711 221 Zack Carlton, Community Development Director
Ave. NW / 22460 US Hwy. 169
Reviewed by
Ordinance Amending Section 30-1834. SWF solid
Suzanne Fischer, Environment Services/Special Projects
waste facility overlay district, Case No. OA 23-02
Director
Action Requested
Recommend, by motion, approval of the ordinance amendment as drafted.
Background/Discussion
The Elk River Landfill (ERL) submitted an application for a Conditional Use Permit (CUP), case number CU 23-
09, to amend their CUP to incorporate approximately 20 additional acres of property, immediately to the south of
the currently permitted landfill footprint. The additional land provides no additional capacity for Municipal Solid
Waste (landfill expansion) but will be used for improved/required stormwater management.
Currently, no portion of a solid waste facility, including any portion of a solid waste facility, easements, water or air
rights, stormwater management facilities, and all buffer areas or buffer zones can occur outside of the Solid Waste
Facility (SWF) overlay district.
For the CUP to be processed, ERL is proposing an ordinance amendment to Section 30-1834(e) to allow for
stormwater management features for the landfill to be located outside of the SWF overlay district. The
amendment has been drafted to allow only stormwater facilities serving approved SWF facilities to be located
outside of the SWF overlay district if on a Zoning Lot (adjacent lot under common ownership).
A Zoning Lot means a parcel of land occupied or used or intended for occupancy or use for a purpose identified
in article VI of this chapter and identified as such for the purposes of zero lot line development. The parcel shall
abut a public street and shall be of sufficient size to satisfy and meet all dimensional regulations required by article
VI of this chapter. The designated zoning lot may encompass more than one lot of record and shall serve as a
unified development site for purposes of application of standards.
Financial Impact
None
Attachments
Proposed Ordinance
Applicant’s Narrative
The Elk River Vision
A welcoming community with revolutionary and spirited resourcefulness, exceptional
service, and community engagement that encourages and inspires prosperity.
Updated: January 2023
Created: 2023-03-07 12:38:54 [EST]
(Supp. No. 57)
Page 1 of 1
Sec. 30-1834. SWF solid waste facility overlay district.
(e) Solid waste facilities restricted to SWF—Solid waste facilities overlay district. No solid waste facility, including any portion
of a solid waste facility, any easements, water or air rights, all stormwater management facilities and all buffer
areas or buffer zones required, needed or useful for the establishment and/or operation of the solid waste
facility, with the exception of facilities necessary for monitoring the offsite impacts of the facility on ground
and surface water, shall be located or operated in the city except in those areas of the city located within the
SWF—Solid waste facilities overlay zoning district. Stormwater facilities serving approved SWF facilities can be
located outside of the SWF overlay district if on a Zoning Lot (directly abutting the property of the approved
use).
(Code 1982, § 900.12(18); Ord. No. 10-02, § 2, 3-15-2010)
CU 23-09 Narrative
The additional 20-acres of property has been purchased by ERL from Tiller Corporation, now part of Martin
Marietta (Tiller). The property is currently used by Tiller for its gravel mining operation, as they retained
mineral rights on the property per the terms of the purchase. As has been the practice at the existing Landfill,
development of Landfill related components (in this case the proposed stormwater management
infrastructure) will follow behind Tiller's mining operations. Tiller has an approved CUP from the City for
their mining activity (including the 20-acre subject property).
The additional property will allow for ERL to construct one large stormwater basin to replace the currently
permitted design which included two sedimentation basins and would have required a lift station to manage
stormwater from the Landfill. The modifications will allow for gravity drainage for stormwater management
(eliminating the lift station) and reduce the amount of controlled fill placement required for perimeter berm
construction. For the previous design, stormwater discharge from the site was under the exterior roadway,
then under the City of Elk River trail, and ultimately to an upstream wetland on property owned by ERL.
The modified design allows for discharge directly west of the proposed pond to an existing low area, on
property also owned by the Landfill, east of the trail (eliminating the need for the City trail crossing).
The proposed sedimentation pond includes settling basins at the east and west ends. A safety bench has been
incorporated into the design and perimeter access for cleaning / maintenance activities has been considered.
The proposed pond has been designed to provide flexibility depending on mining activities in the area. The
bottom elevation of the pond will be at maximum an elevation of 964; the actual elevation may be 964 or
lower depending on mining activities. The design presented herein represents the minimum storage capacity
that would be provided and storm events that would be managed. Actual conditions following mining
activities may provide for management of larger storm events by increasing the available storage capacity.
See the attached "Conditional Use Permit Application" for additional details
Application to the City of Elk River
Elk River Landfill CUP and Ordinance
Amendment for Stormwater
Management Improvements
April 2023
Prepared for:
Elk River Landfill, Inc.
Prepared by:
Stantec Consulting Services Inc.
One Carlson Parkway, Suite 100
Plymouth, MN 55447
PERMIT APPLICATION TO THE CITY OF ELK RIVER
APRIL 2023
Table of Contents
i
Table of Contents
1.0 INTRODUCTION .......................................................................................................... 1.1
1.1 DESCRIPTION OF PROJECT...................................................................................... 1.1
1.1.1 Landfill Development and Closure Construction .......................................... 1.2
1.1.2 Landfill End Use .......................................................................................... 1.2
2.0 APPLICATION REQUIREMENTS ................................................................................ 2.1
2.1 INTRODUCTION .......................................................................................................... 2.1
2.2 CONDITIONAL USE PERMIT REQUIREMENTS ......................................................... 2.1
2.3 APPLICATION FEE ...................................................................................................... 2.2
3.0 CONDITIONAL USE PERMIT ...................................................................................... 3.1
3.1 EXISTING CONDITIONS AND DEVELOPMENT PLAN ............................................... 3.1
3.2 LEGAL DESCRIPTION OF THE SUBJECT PROPERTY ............................................. 3.1
3.3 PROJECT NARRATIVE ............................................................................................... 3.1
3.4 SITE, UTILITY, GRADING / DRAINAGE PLAN ............................................................ 3.2
3.5 LANDSCAPING PLAN ................................................................................................. 3.2
3.6 DRAINAGE CALCULATIONS ...................................................................................... 3.2
3.7 BUILDING ELEVATIONS / FLOOR PLANS.................................................................. 3.2
3.8 WETLAND DELINEATION / WETLAND MITIGATION ................................................. 3.2
3.9 EAW/EIS REQUIREMENTS ......................................................................................... 3.3
3.10 CONDITIONAL USE PERMIT STANDARDS OF ISSUANCE ....................................... 3.3
FIGURES
Figure 1 – Site Map
Figure 2 – Site Development Plan
Figure 3 – Grading and Drainage Plan
LIST OF ATTACHMENTS
Attachment 1 – Legal Description
Attachment 2 – Landscaping Plan
Attachment 3 – Existing Conditions
Attachment 4 – Drainage Calculations
PERMIT APPLICATION TO THE CITY OF ELK RIVER
APRIL 2023
Introduction
1.1
1.0 INTRODUCTION
Elk River Landfill, Inc. (ERL), a wholly owned subsidiary of Waste Management of Minnesota, Inc., owns
and operates a mixed municipal solid waste (MSW) landfill (Landfill) under Minnesota Solid Waste Permit
Number SW-74. The Landfill is located along U.S. TH 169 in the NW ¼ of Section 3, T33N, R26W, and
the SW ¼ of Section 34, T34N, R26W, Sherburne County, Minnesota (see Figure 1). Besides the
construction and demolition debris (C&D) landfill immediately and adjacent to the north of the Landfill, the
remainder of the existing property owned by ERL provides a buffer surrounding the Landfill. The Landfill
is permitted to accept MSW, C&D, yard waste for composting, industrial waste in accordance with a
MPCA-approved Industrial Solid Waste Management Plan, and processing facility rejects.
ERL maintains a Solid Waste Facility (SWF) license and conditional use permits in accordance with City
of Elk River (the City or City) requirements. ERL and the City entered into an agreement on May 25, 2011
for the expansion of the facility into an area referred to as the southern development area (SDA). Based
on the agreement, a Land Use Application was submitted to the City of Elk River dated June 27, 2011.
Subsequently, the application and an amended Conditional Use Permit (CUP) was approved by the Elk
River City Council on September 19, 2011. The SWF license references the amended CUP, and the two
documents authorize construction and operation of the currently permitted facility.
ERL is proposing to revise the CUP to incorporate approximately 20 additional acres of property,
immediately to the south of the currently permitted landfill footprint. The additional 20 acres provides no
additional MSW capacity, but instead will be used for improved stormwater management. Concurrent to
the proposed CUP revision, ERL is proposing an ordinance amendment to Elk River Code, Chapter 30.
Land Development Regulations, Article VI. Zoning, Division 10, Sec. 30 -1834.(e) to allow for stormwater
management features for the landfill to be located outside of the SWF solid waste facility overlay district
boundary.
A request for minor modification to the Landfill’s MPCA Solid Waste permit (SW-74) will also be submitted
to reflect the changes to the site grading and stormwater management features.
1.1 DESCRIPTION OF PROJECT
The additional 20-acres of property has been purchased by ERL from Tiller Corporation, now part of
Martin Marietta (Tiller). The property is currently used by Tiller for its gravel mining operation, as they
retained mineral rights on the property per the terms of the purchase. As has been the practice at the
existing Landfill, development of Landfill related components (in this case the proposed stormwater
management infrastructure) will follow behind Tiller's mining operations. Tiller has an approved CUP from
the City for their mining activity (including the 20-acre subject property).
The additional property will allow for ERL to construct one large stormwater basin to replace the currently
permitted design which included two sedimentation basins and would have required a lift station to
manage stormwater from the Landfill. The modifications will allow for gravity drainage for stormwater
PERMIT APPLICATION TO THE CITY OF ELK RIVER
APRIL 2023
Introduction
1.2
management (eliminating the lift station) and reduce the amount of controlled fill placement required for
perimeter berm construction. For the previous design, stormwater discharge from the site was under the
exterior roadway, then under the City of Elk River trail, and ultimately to an upstream wetland on property
owned by ERL. The modified design allows for discharge directly west of the proposed pond to an
existing low area, on property also owned by the Landfill, east of the trail (eliminating the need for the City
trail crossing).
The proposed sedimentation pond includes settling basins at the east and west ends. A safety bench has
been incorporated into the design and perimeter access for cleaning / maintenance activities has been
considered. The proposed pond has been designed to provide flexibility depending on mining activities in
the area. The bottom elevation of the pond will be at maximum an elevation of 964; the actual elevation
may be 964 or lower depending on mining activities. The design presented herein represents the
minimum storage capacity that would be provided and storm events that would be managed. Actual
conditions following mining activities may provide for management of larger storm events by increasing
the available storage capacity.
1.1.1 Landfill Development and Closure Construction
Modifications to the stormwater management system features have allowed for a reduction in the width of
the perimeter berm on the south termination of the MSW disposal area. Changes to the perimeter
grading plan result in a reduction in fill materials required to complete construction / landfill development.
Consistent with the previous design, stormwater generated from the southern portion of the Landfill will
still be controlled and routed by drainage terraces, downslope structures, perimeter ditching, a nd related
stormwater management infrastructure. Stormwater will be routed through these features to the
proposed large stormwater basin. The modifications to the stormwater management system components
on the Landfill will be incorporated during phased closure construction.
The modifications to the Landfill discussed above will primarily be on the existing property permitted and
approved for Landfill activities and will be addressed in a subsequent minor permit modification
application to the MPCA.
1.1.2 Landfill End Use
The current end use plan for the Landfill will not change and provides for open green space. Long term,
the open space planned for the site would be compatible with any adjacent future use. The end use
determined for the site will be consistent with the terms of previous agreements.
PERMIT APPLICATION TO THE CITY OF ELK RIVER
APRIL 2023
Application Requirements
2.1
2.0 APPLICATION REQUIREMENTS
2.1 INTRODUCTION
The current Landfill footprint is located within a SWF – solid waste facility overlay district, but the 20-acres
of property to the south is not. The additional property is zoned “Agricultural Conservation” and in a
Mineral Excavation Overlay District.
Although the proposed modifications are for stormwater management improvements, and do not allow for
additional waste disposal capacity (the permitted waste limit will remain unchanged), Elk River Code,
Chapter 30. Land Development Regulations, Article VI. Zoning, Division 10, Sec. 30-1834.(e) currently
restricts solid waste facilities, including all stormwater management facilities, to the SWF – solid waste
facilities overlay district. The language in the following portion of the ordinance is proposed to be
amended to allow for stormwater management facilities related to the SWF to be located outside of the
SWF zoned area.
Sec. 30-1834.(e).
No solid waste facility, including any portion of a solid waste facility, any easements, water or air rights,
all stormwater management facilities and all buffer areas or buffer zones required, needed or useful for
the establishment and/or operation of the solid waste facility, with the exception of facilities necessary
for monitoring the offsite impacts of the facility on ground and surface water, shall be located or
operated in the city except in those areas of the city located within the SWF—Solid waste facilities
overlay zoning district.
In addition to the ordinance change request, this application is submitted to obtain a sanitary landfill CUP
to incorporate the additional area into the property but manage the land under the current zoning
designation without expanding the SWF.
2.2 CONDITIONAL USE PERMIT REQUIREMENTS
The Elk River Code, Chapter 30. Land Development R egulations, Article VI. Zoning, Division 2.
Administration and Enforcement, Subdivision III. Conditional Use Permits, governs the conditional use
permit application requirements:
Sec. 30-651. Application.
(b) An application for a conditional use permit shall be filed with the director of planning on a form
prescribed by the city. The application shall be accompanied by such plans and information as may be
required by the city, including, without limitation:
(1) A site plan drawn at scale showing all abutting lots, existing buildings, existing uses, utilities,
curb cuts, and locations of trees having a diameter of six inches or more.
PERMIT APPLICATION TO THE CITY OF ELK RIVER
APRIL 2023
Application Requirements
2.2
(2) A proposed development plan showing proposed ingress and egress to the property and
proposed structures, yards, off-street parking and loading areas and where appropriate, plans
for utilities, screening, buffering, landscape, lighting, signs and open space, and a development
schedule.
In addition to the information required by Code, the Conditional Use Permit application form requires the
submission of the following information:
• Application Fee
• Full legal description of the subject property (in an editable word format)
• A typewritten narrative explaining the request in detail
• Site, Utility, Grading/Drainage Plan
• Landscape Plan completed by registered landscape architect
• Drainage Calculations
• Building Elevations (not applicable)
• Floor Plans (not applicable)
• Wetland Delineation / Mitigation Plan (not applicable)
• EAW/EIS Requirements
• All other information as determined by City Staff
2.3 APPLICATION FEE
The application fees are provided based on the fees itemized on each Application Form. The escrow is
used to pay for City's consultants to review the land use applications. If the escrow is used, then the
applicant will be billed for all additional services:
Application Type Fee Escrow Total
Conditional Use Permit $275 $1,000 $1,275
Ordinance Amendment $275 $1,000 $1,275
Grand Total $2,550
PERMIT APPLICATION TO THE CITY OF ELK RIVER
APRIL 2023
Conditional Use Permit
3.1
3.0 CONDITIONAL USE PERMIT
3.1 EXISTING CONDITIONS AND DEVELOPMENT PLAN
Per City Code, a site plan showing existing conditions is included in Attachment 3. The proposed
development plan for the subject property is included as Figure 3. Development of the stormwater
management pond within the subject property will take place as mining activities progress; the exact
schedule is dependent on mining operations and soils obtained for Landfill operations and construction.
3.2 LEGAL DESCRIPTION OF THE SUBJECT PROPERTY
See Attachment 1.
3.3 PROJECT NARRATIVE
A description of the project is provided in Section 1.1. The Conditional Use Permit application form
requests additional information for a project narrative. The descriptions are itemized in italics below,
followed by ERL’s responses.
Hours of operation
No change is proposed to the current hours of operation.
Number of employees
The proposed changes will not impact the number of employees required at the landfill.
Number of parking stalls (existing and additional)
The Landfill employees park their vehicles at the sites' office building located on the north
side of the existing Landfill. There are 20 parking stalls located at the office building site as
well as ample room for parking in the yard area to the north of the building. No additional
parking stalls are proposed as part of the stormwater management system improvements.
Is there proposed screening of the site?
The proposed Landscape/Screening plan is included in Attachment 2. The plan has been
revised from the previously approved screening plan to accommodate the additional land
area and grading modifications.
Note that trees shown in the Landscape/Screening plan would be installed after waste filling
activities in the adjacent landfill area have ceased and final cover construction is complete
on the south side of the landfill.
Proposed building materials
PERMIT APPLICATION TO THE CITY OF ELK RIVER
APRIL 2023
Conditional Use Permit
3.2
No buildings/structure s are proposed as part of the stormwater management system
improvements.
Signage (how many, proposed sizes, locations, type)
No new entrances are proposed for the Landfill an d, therefore, new signage will not be
required.
Outdoor storage (what, how much, proposed screening)
No outdoor storage is proposed on the additional property.
3.4 SITE, UTILITY, GRADING / DRAINAGE PLAN
The grading and drainage plan for the 20-acre south pond area, including perimeter grading modifications
to the southern portion of the Landfill within the previously permitted property boundary, is included as
Figure 3.
3.5 LANDSCAPING PLAN
The Landscaping/Screening plan for the 20-acre south pond area, including perimeter grading
modifications to the southern portion of the Landfill within the previously permitted property boundary, is
included in Attachment 2. The plan has been prepared by a registered landscape architect and
incorporates a variety of tree types for screening purposes . As previously noted, the plantings shown will
be established after final cover is in-place on the adjacent Landfill area.
3.6 DRAINAGE CALCULATIONS
Drainage calculations are provided in Attachment 4. The final bottom elevation of the modified /
expanded stormwater pond will be dependent on mining activities within the footprint. Based on the
maximum bottom elevation of 964 as shown on the grading / drainage plan, the expanded pon d will
manage the required 25-year, 24-hour storm event as well as larger storm events (with minimal
discharge). Discharge from larger events will be retained on ERL property.
3.7 BUILDING ELEVATIONS / FLOOR PLANS
Not applicable.
3.8 WETLAND DELINEATION / WETLAND MITIGATION
Not applicable. There are no wetlands on the subject property; the property has been and will continue to
be mined for sand and gravel resources.
PERMIT APPLICATION TO THE CITY OF ELK RIVER
APRIL 2023
Conditional Use Permit
3.3
3.9 EAW/EIS REQUIREMENTS
The subject property was previously evaluated as part of a larger expanded Landfill footprint that required
a mandatory Environmental Impact Statement (EIS) under the requirements of Minn. R. 4410.4400, subp.
13(E). The Draft and Final EIS for the expansion were previously provided to the City. The EIS was
completed in 2005 and approved by the Minnesota Pollution Control Agency (MPCA) in 2006. The EIS
findings concluded that environmental impacts would likely be minimal, or that adequate mitigation plans
were in place to address potential impacts. The proposed stormwater management system
improvements do not include any additional waste disposal areas, leachate management system
infrastructure, gas system infrastructure, or other related Landfill components that could potentially impact
groundwater, wetlands, or air quality, as evaluated in the EIS.
3.10 CONDITIONAL USE PERMIT STANDARDS OF ISSUANCE
The Elk River Code, Chapter 30. Land Development Regulations, Article VI. Zoning,
Division 2. Administration and Enforcement, Subdivision III. Conditional Use Permits,
governs the issuance of conditional use permits and establishes the following required
findings:
Sec. 30-654. Standards for issuance.
(a) Required findings. The planning commission shall recommend a conditional use
permit and the council shall order the issuance of such a permit only if it finds that such use
at the proposed location:
(1) Will not endanger, injure, or detrimentally affect the use and enjoyment of
other property in the immediate vicinity or the public health, safety, morals,
comfort, convenience or general welfare of the neighborhood or the city.
(2) Will be consistent with the comprehensive plan.
(3) Will not impede the normal and orderly development and improvement of
surrounding vacant property.
(4) Will be served adequately by and will not adversely affect essential public
facilities and services including streets, police and fire protection, drainage, refuse
disposal water and sewer systems, parks and schools; and will not, in particular,
create traffic congestion or interference with traffic on adjacent and neighboring
public thoroughfares.
(5) Will not involve uses, activities, processes, materials, equipment, and
conditions of operation that will be detrimental to any persons or property because
of excessive traffic, noise, smoke, fumes, glare, odors, dust, or vibrations.
(6) Will not result in the destruction, loss, or damage of a natural scenic or
historic feature of major importance.
(7) Will fully comply with all other requirements of this Code , including any
PERMIT APPLICATION TO THE CITY OF ELK RIVER
APRIL 2023
Conditional Use Permit
3.4
applicable requirements and standards for the issuance of a license o r permit to
establish and operate the proposed use in the city.
ERL has in place an approved sanitary landfill CUP and SWF license. The Landfill will continue to operate
as it has in the past, in accordance with City's requirements. The proposed additional land acquired for
stormwater management is consistent with the approved CUP for the existing Landfill. Current standards
will continue to be met. The stormwater management improvements allow for additional ponding area
and open green space. Use at the proposed location meets the requirements itemized above, as
presented in this Conditional Use Permit Application document.
CONDITIONAL USE PERMIT APPLICATION TO THE CITY OF ELK RIVER
ATTACHMENT 1
Legal Description
LEGAL DESCRIPTION
That part of the Southwest Quarter of Section 3, Township 33, Range 26, Sherburne
County, Minnesota, lying south of the South line of the North 525.00 feet thereof, and
lying west of U.S. Highway No. 169; and that part of the Northeast Quarter of the
Southeast Quarter of Section 4, Township 33, Range 26, said county, lying south of the
South line of the North 525.00 feet thereof, and lying east of the former Great Northern
Railroad, all lying south of the following described line:
Beginning at the intersection of said South line of the North 525.00 feet with the West
right of way line of said U.S. Highway No. 169; thence South 07 degrees 30 minutes 44
seconds East, assuming said South line of the North 525.00 feet of said Southwest
Quarter bears South 89 degrees 47 minutes 13 seconds East, a distance of 633.89 feet;
thence North 90 degrees 00 minutes 00 seconds West, a distance of 2394.80 feet to
intersect the easterly right of way line of said former Great Northern Railroad.
And lying north of the following described line:
Beginning at the intersection of said South line of the North 525.00 feet with the West
right of way line of said U.S. Highway No. 169; thence South 07 degrees 30 minutes 44
seconds East, assuming said South line of the North 525.00 feet of said Southwest
Quarter bears South 89 degrees 47 minutes 13 seconds East, a distance of 992.14 feet;
thence North 90 degrees 00 minutes 00 seconds West, a distance of 2531.33 feet to
intersect the easterly right of way line of said former Great Northern Railroad.
CONDITIONAL USE PERMIT APPLICATION TO THE CITY OF ELK RIVER
ATTACHMENT 2
Landscaping Plan
CONDITIONAL USE PERMIT APPLICATION TO THE CITY OF ELK RIVER
ATTACHMENT 3
Existing Conditions
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ORIGINAL SHEET - ANSI D
Permit-Seal
Drawing No.Client/ProjectSheet
of
Project Number:
Revision the drawing - any errors or omissions shall be reported to Stantec without delay.The Contractor shall verify and be responsible for all dimensions. DO NOT scale or use for any purpose other than that authorized by Stantec is forbidden.The Copyrights to all designs and drawings are the property of Stantec. Reproduction ByIssuedAppd.YY.M M.DD1
1 1
PRINT NAME
SIGNATURE
DATE LICENSE #
I HEREBY CERTIFY THAT THIS PLAN, SPECIFICATION,
OR REPORT WAS PREPARED BY ME OR UNDER
MY DIRECT SUPERVISION AND THAT I AM A DULY
LICENSED PROFESSIONAL ENGINEER UNDER THE
LAWS OF THE STATE OF MINNESOTA.
Chkd.Dwn.Dsgn.YY.MM.DD
File Name:
JWT ELK RIVER LANDFILLSherburne County, MinnesotaCMaple Plain, Minnesota, 553571800 Pioneer Creek Center3.
2.
1.
NOTES:
CELL)
(ACTIVE
PHASE 1
CELL 20
PHASE 2
CELL 20
Tepfer, Jeffrey By: Existing Conditions0
BARR ENGINEERING.
MONITORING WELL AND GAS PROBE LOCATIONS PROVIDED BY
VERTICAL DATUM = NGVD 1929
LANDFILL, DECEMBER 7, 2022.
APRIL 11, 2015 , AND SURVEY PROVIDED BY ELK RIVER
MAPPING PERFORMED BY WILLIAMS AERIAL & MAPPING, INC.U:\27705870\drafting/existing conditions/05870e_sp_2023_01.dgn227705870
23.04.19
02870e_sp_2023_01EXISTING CONDITIONS
CONDITIONAL USE PERMIT APPLICATION TO THE CITY OF ELK RIVER
ATTACHMENT 4
Drainage Calculations
Memo
To: Elk River Landfill From: Megan Ambuehl, PE
Ethan Ketelsen, PE
File: South Stormwater Pond Date: April 21, 2023
Reference: South Stormwater Pond Re-Design; City of Elk River Application
Modifications to the stormwater management system for the southern portion of the MSW disposal area have
been made to accommodate gravity drainage for stormwater management. The previous design included two
sedimentation basins and would have required a lift station to manage stormwater from the landfill; discharge
was under the exterior roadway, then under the City of Elk River trail, and ultimately to an upstream wetland
on property owned by Waste Management. Consistent with the previous design, stormwa ter generated from
the southern portion of the landfill will still be controlled and routed by drainage terraces, downslope
structures, perimeter ditching, and related stormwater management infrastructure. Stormwater will be routed
through these features to one large stormwater basin as shown on the attached subwatershed map. The
proposed larger stormwater basin will allow for on-site control of stormwater, eliminating the trail crossing.
The discharge point will be directly west of the proposed pond to an existing low area, on property owned by
by the Landfill, east of the trail.
HydroCAD stormwater modeling, using the SCS Curve Number method, was used to calculate run-off
hydrographs for the final landfill configuration which assumes all landfill areas are closed with the final
capping system. To determine surface water run-off for this analysis, the landfill area draining to the southern
pond was divided into subwatersheds depending on the contributing drainage areas. Subwatershed areas
are shown on the attached figure. Model inputs were consistent with the previously completed modeling for
the site. Run-off curve numbers of 77, 80, and 98 were used for the landfill top, sides and ponded water in the
sedimentation basin, respectively. Perimeter areas were assigned curve numbers of 55 (woods), 69 (fair
grass cover), and 81 (developed urban industrial area) depending on existing or expected condition at the
time of final closure of the current MSW disposal area. Time of concentration was computed within the
HydroCAD model based on the characteristics of each subwatershed (i.e. hydraulic distance and slope).
Peak flows from the subwatersheds were calculated for the 25-year and 100-yr 24-hr storm events based on
NOAA Atlas 14 precipitation frequency estimates for the site.
• 25-year, 24-hr = 5.19 inches
• 100-year, 24-hr = 6.86 inches
Runoff-calculations were used to size the various components of the surface water management system
routing drainage to the south stormwater basin. Landfill development is in progress and currently Cell 20
Phase 3 is planned to be constructed in 2023. The drainage area contributing runoff to the pond will depend
on waste filling activities and final cover construction; with the ultimate drainage area realized at the time of
final closure of the currently permitted MSW disposal area. Prior modeling completed for the site included
open channel flow within the landfill footprint. The re-design project modeling has incorporated a piping
network. MPCA solid waste rules require management of the 25-year, 24-hr storm as the minimum design
storm event. For the purposes of the southern pond re -design project, piping has been sized based on the
100-year, 24-hr storm event. Actual materials used for downslope structure or other infrastructure
construction may vary; open channel flow or piping networks may be utilized for drainage. At minimum, the
25-year 24-hour storm event will be considered during construction level design/implementation.
April 21, 2023
Elk River Landfill
Page 2 of 2
Reference: South Stormwater Pond
u:\227705870\technical\south_stormwater_pond\cup\attachment 4 - drainage calculations\stormwater write-up.docx
The southern stormwater basin was designed to provide flexibility depending on mining activities in the area.
The maximum bottom elevation of the pond will be at an elevation of 964; the actual elevation may be 964 or
lower. Modeling assumed a bottom elevation of 964 with two deeper settling basins at the east and west
ends of the pond, as shown on the drainage map. A safety bench has been incorporated into the pond
design and perimeter access for cleaning / maintenance activities has been considered. A 5:1 slope on the
north side of the pond was implemented to visually change the slope and allow for additional landscaping.
Based on site soils, it is anticipated that infiltration will take place within the pond footprint. However, to be
conservative, no infiltration was assumed in the stormwater model. The stormwater basin includes an outlet
culvert at an elevation of 967.5’. Since it is anticipated that infiltration will occur (onsite soils are HSG A/B
soils) the outlet culvert will serve as an overflow mechanism, rather than a typical pond outlet structure. As
another conservative design measure, the model assumes that run-off from a 25-year, 24-hr storm event is in
the pond at the start of the modeled storm (~2.0 feet of water within the pond). If stormwater does discharge
through the outlet culvert, stormwater would flow through the pipe to an existing wooded, low-lying area
directly west of the pond footprint. The overflow elevation of this low-lying area is 969.5; the area was
included in the modeling to confirm that discharge will remain on Landfill property for the design storm events.
Incorporating the shallowest anticipated pond grades into the model, results indicate that the 25-yr and 100-yr
storm events will be managed with no off-site discharge. The 100-yr event includes nominal discharge to the
low-lying area onsite. Excavation below the grades shown would result in more ponding capacity and the
capability to manage even more extreme storm events with no discharge from the Landfill property.
A summary of the pond performance for the modeled storm events is included below:
Storm Event
25-yr 100-yr
Pond Peak Water Elev. 967.88 968.66
Pond Discharge (cfs) 0.00 0.34
Low Area Peak 968.58 969.34
Low Area Discharge (cfs) 0.00 0.00
Stantec Consulting Services Inc.
Attachment: Subwatershed Map
1020
1030
1050
1070
1080
109011001110111811183%x1119.51110112011101040
1060
1100
1110 105010601070108010901100102010301040105010601070CBMH1020
1030
3:1970
980
990
1000
1010
964
964
970 970960960980990960960964
964
CB
CB
CB
CB
CB
CB
CB
CB
CB
CB
9709809905:15:
1
1040
EXISTING 18" RCP
EXISTING MANHOLE
EXISTING 30" RCP
EXISTING CATCH BASIN
TOP ELEV 969.5
PROPOSED 15' WIDE BERM
BENCH @ 967.5
PROPOSED 10' WIDE
SETTLING BASIN
PROPOSED
SETTLING BASIN
PROPOSED
EXISTING CONTOURS
LEGEND
TREE LINE
EXISTING ROAD
PROPERTY LINE
BUILDING
800
0 100 200
SCALE IN FEET
N
SOUTH SEDIMENTATION POND
CATCH BASIN MANHOLE
PROPOSED
MANHOLE
CATCH BASIN
PROPOSED
OR LOWER)
ELEVATION 964 (ELEVATION TO BE 964
BASED ON MINING ACTIVITIES; MAXIMUM
POND BOTTOM ELEVATION MAY VARY
NOTE:
ROAD @ 10%
WIDE ACCESS
PROPOSED 15'
DOWNSLOPE PIPE
PROPOSED 36" CPEP
DOWNSLOPE PIPE
PROPOSED 36" CPEP
W. INV. 966.7
E. INV. 967.5
OVERFLOW PIPE.
PROPOSED 36" MIN.
RIPRAP
PROPOSED
Permit-Seal
Drawing No.Client/ProjectSheet
of
Project Number:
Revision ByIssuedAppd.YY.M M.DD
1
0
JWT
1
PRINT NAME
SIGNATURE
DATE LICENSE #
I HEREBY CERTIFY THAT THIS PLAN, SPECIFICATION,
OR REPORT WAS PREPARED BY ME OR UNDER
MY DIRECT SUPERVISION AND THAT I AM A DULY
LICENSED PROFESSIONAL ENGINEER UNDER THE
LAWS OF THE STATE OF MINNESOTA.
5
2023.04.11
227705870ByRevisionAppd.YY.M M.DDChkd.Dwn.Dsgn.YY.MM.DD
File Name:jeffrey tepferELK RIVER LANDFILLSHERBURNE COUNTY, MINNESOTAGrading PlanDECEMBER 2022.
SURVEY PROVIDED BY ELK RIVER LANDFILL
MAPPING, INC. APRIL 11, 2015, WITH DRONE
MAPPING PERFORMED BY WILLIAMS AERIAL &
NOTE:U:/227705870/drafting/2023 south pond CUP.dgn2023 south pond CUP
(TYP.)
PROPOSED BENCH
STRUCTURE
WEST DOWNSLOPE
DISSIPATOR
PROPOSED ENERGY
STRUCTURE
PROPOSED DOWNSLOPE
DOWNSLOPE STRUCTURE
PROPOSED
ENERGY DISSIPATOR
PROPOSED
STRUCTURE
EAST DOWNSLOPE
BASIN (TYP.)
PROPOSED CATCH
(TYP.)
PROPOSED BENCH
800 PROPOSED CONTOURS
PROPERTY BOUNDARY
PREVIOUS LANDFILL
PROPERTY BOUNDARY
EXTENDED LANDFILL
ORDINANCE AND CUP AMENDMENT APPLICATIONSW-35
385,374 sf
SW-36
56,415 sf
SW-37
95,530 sf
SW-38
114,445 sf
SW-41
66,039 sf
SW-44B
108,550 sf
Ditch-
39
DT-44B
DT-
35
DT-
36DT-
37
Dit
ch
38
DT-41
WD
S-
1
WD
S-
2WD
S-
3WD
S-
4
WD
S-
5
West
Road
Cross
ing
West slope grading
changes to
accommodate 2022
closure construction
are shown; however,
the original
drainage areas have
still been
considered in the
stormwater modeling
(the model is
conservative).
SW-39
155,329 sf
SW-45B
59,711 sf
SW-42
68,296 sf
SW-43
101,721 sf
Direct Pond
909,842 sf
DT-45A
DT-44A
DT-42
DT-43
Ditch
45-B
East
Road
Crossing
SW-34
410,994 sf
SW-46
113,368 sf D
T
-
4
6
SW-47
109,948 sfD
T
-
4
7
SW-48
83,249 sfD
T
-
4
8
DT
-3
4
SW-45
A
92,463
SF
(SW
extends
off page)
SW-44A
161,59
8 SF
(SW
extends off
page)
Note: square foot
areas shown have
been reflected in the
HydroCAD model as
acres (input to the
tenth of an acre)
Direct Low Area
127,525 sf East 12.3acres(SW extends offpage)
CONDITIONAL USE PERMIT APPLICATION TO THE CITY OF ELK RIVER
FIGURES
Figure 1 – Site Map
Figure 2 – Site Development Plan
Figure 3 – Grading and Drainage Plan
Existing Scale
Existing Leachate
Storage
Existing
Recycling
Building
Existing Office/
Maintenance Building
Existing Landfill Gas
to Energy Plant
Construction and
Demolition
Debris Landfill
Stormwater Management Area
MSW
Landfill
Existing
Site Entrance/Exit
Existing
Site Exit
Existing
Parking
Area
Existing Yard
£¤169
£¤169
221st Ave NW
221st St 225th St NWQuinn St NW223rd Ave NW
225th St NW
1
75-103-2400
30-033-4400
30-034-2200
75-104-1105
30-523-0115
75-672-0004
75-103-3200
30-033-1300
30-033-410030-033-4200
75-109-1100
30-523-0105
30-523-0110
30-033-1100
75-103-2100
75-104-1400
75-109-1201
75-103-1300
75-110-2200
75-103-4200
75-104-1102
75-103-420175-104-4200
75-103-1101
30-033-2400
75-104-1101
30-034-2201
30-033-3400
75-110-2102
75-104-4300
75-109-1200
75-104-2100
75-128-000175-672-0003
30-501-0225
75-104-4405
75-104-4306
75-104-4100
75-103-2105
75-672-0080
75-110-2100
75-104-4105
75-104-420530-034-420030-034-4400
30-034-3400
75-110-110575-104-4410
30-034-3300
75-104-4400
30-034-1301
75-103-330075-104-421030-501-0220
75-110-220275-104-430575-128-000030-034-130075-103-310030-033-440575-104-421530-034-
3
4
0
1
30-033-1200
30-034-310030-523-012030-034-210030-033-2100
75-104-4307 30-523-012530-523-013075-672-09
3
0
75-672-0715
75-672-0575
75-672-0710
75-672-0925
75-672-0705
75-103-3205
75-672-0585
30-531-0205
75-672-0570
75-672-0920
75-672-0565
75-672-0580
75-672-0935
75-672-0560
75-672-0605
75-672-0590
75-672-0610
75-672-0805
75-672-0555
75-672-0595
75-104-4301
75-672-0005
75-672-0006
75-672-0007
75-672-0060
75-672-0910
75-672-0050
600 0 600300
Feet ³
Legend
Previous Elk River
Landfill Boundary
Extended Landfill Property Boundary
Approximate Property Boundaries
Figure 1 - Site Plan - Entire Property
Path: V:\2277\active\227701797\gis\Pro\CUP\CUP.aprx
Aerial Photograph (Source: 2023 Stantec & 2022 Sherburne Co)
Existing Scale
Existing Leachate
Storage
Recycling
Building
Existing Office/
Maintenance Building
Existing Landfill Gas
to Energy Plant
Active Construction
and Demolition
Debris Landfill
Active
Area Site Entrance/Exit
Site Exit
Parking Area
£¤169
£¤169
221st Ave NW
221st St 225th St NWQuinn St NW223rd Ave NW
225th St NW
Stormwater Management Area
DC-9A
(Future)
DC-8A
(Future)
DC-7A
(Future)
DC-6A
(Future)
DC-5A
(Active)
DC-4A
(Active)
Demo Debris
Cell D1 Demo Debris
Cell D2
Cell 9 Cell 7 Cell 1
Cell 2 Cell 3
Cell 4 Cell 5
Cell 6N
Cell 6S
Cell 11
Cell 10N
Cell 10S
Cell 12
Cell 13
Cell 14
Cell 15
(Active)
Cell 16
(Active)
Cell 17
(Active)
Cell 18
(Active)
Cell 19 West
(Active)
Cell 19 East
(Active)
Cell 20 Phase
1 (Active)Cell 20
Phase 3
(Future)Cell 20 Phase
2 (Active)
600 0 600300
Feet ³Aerial Photograph (Source: 2023 Stantec & 2022 Sherburne Co)
Legend
Previous Elk River
Landfill Boundary
Extended Landfill Property Boundary
Any future buildings/structures
to be located in this area
Existing Closed Area
Cell Boundaries
Active Area
Figure 2 - Site Development Plan - Entire Site
Path: V:\2277\active\227701797\gis\Pro\CUP\CUP.aprx
1020
1030
1050
1070
1080
109011001110111811183%x1119.51110112011101040
1060
1100
1110 105010601070108010901100102010301040105010601070CBMH1020
1030
3:1970
980
990
1000
1010
964
964
970 970960960980990960960964
964
CB
CB
CB
CB
CB
CB
CB
CB
CB
CB
9709809905:15:
1
1040
EXISTING 18" RCP
EXISTING MANHOLE
EXISTING 30" RCP
EXISTING CATCH BASIN
TOP ELEV 969.5
PROPOSED 15' WIDE BERM
BENCH @ 967.5
PROPOSED 10' WIDE
SETTLING BASIN
PROPOSED
SETTLING BASIN
PROPOSED
EXISTING CONTOURS
LEGEND
TREE LINE
EXISTING ROAD
PROPERTY LINE
BUILDING
800
0 100 200
SCALE IN FEET
N
SOUTH SEDIMENTATION POND
CATCH BASIN MANHOLE
PROPOSED
MANHOLE
CATCH BASIN
PROPOSED
OR LOWER)
ELEVATION 964 (ELEVATION TO BE 964
BASED ON MINING ACTIVITIES; MAXIMUM
POND BOTTOM ELEVATION MAY VARY
NOTE:
ROAD @ 10%
WIDE ACCESS
PROPOSED 15'
DOWNSLOPE PIPE
PROPOSED 36" CPEP
DOWNSLOPE PIPE
PROPOSED 36" CPEP
W. INV. 966.7
E. INV. 967.5
OVERFLOW PIPE.
PROPOSED 36" MIN.
RIPRAP
PROPOSED
Permit-Seal
Drawing No.Client/ProjectSheet
of
Project Number:
Revision ByIssuedAppd.YY.M M.DD
1
0
JWT
1
PRINT NAME
SIGNATURE
DATE LICENSE #
I HEREBY CERTIFY THAT THIS PLAN, SPECIFICATION,
OR REPORT WAS PREPARED BY ME OR UNDER
MY DIRECT SUPERVISION AND THAT I AM A DULY
LICENSED PROFESSIONAL ENGINEER UNDER THE
LAWS OF THE STATE OF MINNESOTA.
5
2023.04.11
227705870ByRevisionAppd.YY.M M.DDChkd.Dwn.Dsgn.YY.MM.DD
File Name:jeffrey tepferELK RIVER LANDFILLSHERBURNE COUNTY, MINNESOTAGrading PlanDECEMBER 2022.
SURVEY PROVIDED BY ELK RIVER LANDFILL
MAPPING, INC. APRIL 11, 2015, WITH DRONE
MAPPING PERFORMED BY WILLIAMS AERIAL &
NOTE:U:/227705870/drafting/2023 south pond CUP.dgn2023 south pond CUP
(TYP.)
PROPOSED BENCH
STRUCTURE
WEST DOWNSLOPE
DISSIPATOR
PROPOSED ENERGY
STRUCTURE
PROPOSED DOWNSLOPE
DOWNSLOPE STRUCTURE
PROPOSED
ENERGY DISSIPATOR
PROPOSED
STRUCTURE
EAST DOWNSLOPE
BASIN (TYP.)
PROPOSED CATCH
(TYP.)
PROPOSED BENCH
800 PROPOSED CONTOURS
PROPERTY BOUNDARY
PREVIOUS LANDFILL
PROPERTY BOUNDARY
EXTENDED LANDFILL
ORDINANCE AND CUP AMENDMENT APPLICATION23 232323
PRINT NAME
SIGNATURE
DATE LICENSE #23/04/21 48669
MEGAN AMBUEHL
123