HomeMy WebLinkAbout#10 Engineering & Landscape Design STAFF REPORT
DATE: 4/18/17
CONSENT
ITEM #: 10
MOTION
TO: City Council
AGENDA ITEM: Engineering Design and Construction Standards Manual – March 2017 Revisions
& Landscape Design and Construction Standards Manual – March 2017
SUBMITTED BY: Stephen Wensman, Planning Director and Jack Griffin, City Engineer
REVIEWED BY: Kristina Handt, City Administrator
Rob Weldon, Public Works Director
Chad Isakson, Assistance City Engineer
Stephen Mastey, Consulting Landscape Architect
BACKGROUND:
Engineering Design and Construction Standards: The City has prepared and maintains engineering
design standards, standard specifications, and standard details for public infrastructure within the City,
including streets, sanitary sewer, watermain, storm water facilities, right-of-way management, and
boulevard layout. This information is compiled into an Engineering Design and Construction Standards
Manual for use by staff and the development community. The latest version of the Manual is dated February
2015.
The standards have been established to set minimum requirements to be met for all public infrastructure
projects in the City with the intent of constructing consistent and compatible infrastructure systems
throughout the community; to clearly communicate with the development community these minimum
expectations and requirements; and to expedite plan design, preparation and City plan review and approvals.
The engineering design standards and guidelines have been established to address the most common project
elements and are to be used in conjunction with the requirements set forth by applicable codes, laws and
ordinances, recognized industry standards, good engineering practice and specific project needs. Omission
of reference in these standards and guidelines does not relieve responsibility for compliance with these
requirements. In addition, the provisions of these standards and guidelines are not intended to prohibit the
use of alternative systems, methods or components. Professional engineering judgement and ingenuity is
encouraged to adapt to specific project needs. However, varying from the standards and guidelines will
only be permitted with the approval of the City Engineer, after performing due diligence to ensure the
design is equivalent or superior to the prescribed elements of the guideline.
Landscaping and Irrigation Standards: In a similar manner, staff has been developing a set of
landscaping and irrigation standards and practices to better accommodate the issues experienced with the
development plan and construction oversight of landscaping. These practices have been packaged together
to create a more formal Landscaping Design and Construction Standards Manual for use by City staff.
ISSUE BEFORE THE COMMISSION: Staff respectfully requests that the City Council review and
approval of the March 2017 revisions to the Engineering Design and Construction Standards Manual and
the new Landscaping Design and Construction Standards Manual.
PROPOSAL DETAILS/ANALYSIS:
Engineering Design and Construction Manual Revisions and Updates: The Engineering Design and
Construction Standards Manual is a living document that is reviewed and modified from time to time by
the City Engineering team to adapt pro-actively to changing conditions so as to remain current, address best
practices and extract additional economic value and performance as needed. Changes are often based on
recommendations from Planning, Public Works or other City staff, the development community, and other
stakeholders. Changes made by the City Engineer over time are periodically brought forward as revisions
to the Engineering Design and Construction Standards Manual to formalize the City’s approval. The
Engineering Design and Construction Standards Manual dated March 2017 includes the following revisions
and updates:
Plan Format Requirements.
1. Updated the Plan Format requirements to require electronic plans for a complete submittal.
2. Removed reference to City benchmark system.
3. Added requirement to provide “All proposed lot corner elevations” as part of the grading plans.
4. Revised section IV. F. to clarify NWL and HWL plan requirements and require HWL contours.
5. Updated the Plan Format requirements to clarify record drawing requirements.
o Revised II. A. to remove house pad as-built elevations.
o Deleted II. M. requiring shots sufficient to produce 2 ft. contours.
o Revised II. N. grade tolerance language to indicate areas outside of tolerance “may” be
subject to revisions/re-work.
o Added III.F. “Ties for draintile cleanouts to permanent structures.”
Design Standards.
1. Clarified local street widths for a) parking both sides b) parking one side and c) no parking.
2. Added minimum tangent requirements at local street intersections.
3. Collector street and right-of-way widths were changed to “case by case basis”.
4. Changed drain tile pipe to PVC schedule 40.
5. Sign post standards were changed per direction of Public Works.
6. Clarified the City street light fixture and pole requirements.
7. Revised tracer wire requirements to be 12 AWG and added Drive-in Magnesium Grounding Anode
Rod requirements to assist Public Works with utility locates.
8. Changed the minimum watermain pipe size to 6-inch diameter when allowed by the City Engineer.
9. Maximum length of pipe at dead ends. Changed to 1,000 feet.
10. Added 4-foot Sump Manhole requirement to be consistent with VBWD standards.
11. Stormwater BMPs.
o Changed Pretreatment forebay to no longer be “Required”.
o Added Clay Pond Liner specifications for wet ponds to meet VBWD standards.
o Removed infiltration basin plantings to reference approved Landscape Plan.
o Revised and detailed infiltration basin boring requirements.
12. Updated City Low Impact Development practices language.
13. Removed landscaping details.
14. Update detail plate index.
15. Unresolved items.
o Review/revise turning radius at intersections w/center medians. Snow plow issues.
Standard Details.
1. Revised all Standard Details to “MARCH 2017” and updated the index details to reflect updated
numbering system.
2. 201 – Added hydrant concrete splash pad per Public Works request.
3. 203 – Revised gate valve key requirements per Public Works request.
4. 208 – Added note to reference Landscape Irrigation Standards for work by Private Contractor.
5. Added tracer wire requirements for utility locate assistance. Details provided by Public works.
o 300A – Added tracer wire note.
o 313 – Added access box and grounding rod detail.
o 315 – Added detail for tracer wire plan view.
6. 416 – Revised minimum pond depth to 3-feet to match design standard.
7. 419 – Changed draintile pipe to Schedule 40 PVC.
8. 505 – Updated valley gutter detail to 6 foot width and removed mesh.
9. 507A, 507B, 507C, 507D, and 507E. Added MnDOT Pedestrian ramp standard detials.
10. 509 – Updated standards trail width to 8 feet from 8-1/2 feet.
11. 514 – Added new detail for bituminous saw and seal requirements for residential streets.
12. 600D – Removed comment #5 requiring placement of 2 rows of sod and silt fence.
13. 801 – Updated draintile note to schedule 40 pipe.
14. 804 – Updated draintile note to schedule 40 pipe.
15. 805 – Removed reference for the placement of 2 rows or sod/silt fence.
16. 807A – Added detail for Temporary Cul-De-Sac Type A.
17. 807B – Added detail for Temporary Cul-De-Sac Type B.
18. Removed Section 900 Landscape/Irrigation details to be located in Landscape Standards Manual.
19. Created new Section 900 for Signing/Pavement Markings/Lighting.
20. Added Detail 902 and 903 to detail new street and traffic sign post standards per Public Works.
Standard Specifications.
1. Revised all Standard Specifications to “MARCH 2017”.
2. Section 1450 – Included Modified Penetration Test for Aggregate Base Compaction (industry
standard by Geotech field technicians).
3. Section 3217 – Revised pavement marking materials (Section 4.C.).
4. Removed 3290 (Landscape Plantings). Moved Prairie Style turf to turf establishment section.
5. Section 3307 – Tracer wire changed to 12 gauge per manufacturer’s recommendation.
6. Section 3330 – Added tracer wire requirements per direction of Public Works. Using MWRA
specifications incorporated. Grounding rod/access box at every service.
7. Section 3340 – Revised spec to address new MDH requirement for watertight connection on all
storm sewer structures within 10 feet of watermain.
8. Section 3346 – Revised spec for draintile to be Schedule 40 PVC.
9. Section 3440 – Revised sign posts per Public Works new standards and to match new details.
Landscape Design and Construction Manual Revisions and Updates: The new Landscape Design and
Construction Manual includes updated details for deciduous, coniferous trees and shrubs for flat and sloped
site planting. The tree protection detail was moved into the landscape standards. The landscape standards
also include required and recommended details for landscape irrigation. The required irrigation details
include the water service and controller details that illustrate the required connections to Municipal Water
consistent with City Council’s direction in 2016 when reviewing and adopting the irrigation standards. The
recommended details illustrate best practices in landscape irrigation and these details are taken from the 5th
Street project, where irrigation is required. All the irrigation standard details refer to updated irrigation
specifications. Other improvements to the details include:
• To be current with MN Department of Transportation Standard Specifications for Construction
2016 Edition;
• To be current with the latest edition of American Standard for Nursery Stock (ANSI Z60.1);
• To clarify and provide additional guidance on incorrect planting practices that have been
observed from time on time projects within in the City specifically on City owned property / right
of way;
• Provide guidance within the irrigation specification and details to help further protect the City’s
potable water resources; and
• To be current with updated technology advances within the irrigation industry specifically in the
areas of energy efficiency, water conservation, improved watering that coincides with better plant
health and increased sustainability of the irrigation products and systems supplied.
Note: The Landscape Design and Construction Manual will be assigned a different numbering system than
presently shown on the attached details that are uniquely different than the Engineering set.
PLANNING COMMISSION REVIEW AND RECOMMENDATION: The Planning Commission
reviewed the Engineering and Landscape Design and Construction Standards Manuals on 4/10/17 and had
the following comments:
• Wanted the City to develop lighting standards or ordinances to minimize residential lighting.
• Wanted the Landscape planting details to better highlight planting with the root flare above the
adjacent grade.
• Wanted the Landscape Details or Ordinances to minimize the need for irrigation.
The Planning Commission recommended approval of the Engineering Design and Construction Standards
Manual with the following condition:
1. That lighting standards or ordinances be developed to minimize residential lighting.
The Planning Commission recommended approval of the Landscape Design and Construction Standards
Manual with the following condition:
1. That the planting details be amended to better highlight planting with the root flare above the
adjacent grade.
2. That the ordinances be amended to minimize the need for irrigation.
RECOMMENDATION: Staff is recommending that the City Council approve the March 2017 revisions
to the Engineering Design and Construction Standards Manual as presented since the goal to minimize
residential lighting must first be developed by staff and the lighting standards will be addressed by
ordinance. The engineering standards currently do not address lighting so there are no conflicts with the
Planning Commission request. Staff is further recommending that the City Council approve the Landscape
Design and Construction Standards Manual as amended to better highlight planting with the root flare above
the adjacent grade. Staff believes the goal to minimize the need for irrigation should also be addressed by
ordinance.
“Move to recommend approval of the March 2017 revisions to the
Engineering Design and Construction Standards Manual and the new Landscape Design and
Construction Standards Manual.”
ATTACHMENTS:
1. Plan Format Requirements – Redlines showing changes from February 2015 to March 2017.
2. Engineering Design Standards – Redlines showing changes from February 2015 to March 2017.
3. Standard Details – New details 201, 208, 315, 514, 807A, 807B, 902, and 903.
4. Landscape Standard Details and Specifications.
*The full Engineering Design and Construction Standards Manual, dated March 2017 is available for
review at City Hall.
City of Lake Elmo Revision Date: March 2017February 2015 Page 1 of 7
Plan Sheet Format Requirements
PLAN SHEET FORMAT REQUIREMENTS
for
CITY OF LAKE ELMO
This document outlines the required plan format and minimum acceptable plan sheet requirements
for each development project within the City of Lake Elmo. The minimum requirements shall be met
for all projects before approval may be granted by the City Engineer.
Plan submittals will not be considered received until all plan formats have been submitted to the City.
All submittals and resubmittals shall include full size plans (22” x 34”), half size plans (11” x 17”) and
electronic plan files in PDF format.
GENERAL REQUIREMENTS:
1. Plan sheet size shall be 22” x 34” and 11” x 17”.
2. All Plans shall be submitted in electronic PDF format.
2.3. All electronic CAD/GIS files, when required, must be accompanied by a “layer description list”
that clearly identifies the elements of each layer or level.
3. Vertical control of Construction Record Drawings must be on the City’s Benchmark System.
CONSTRUCTION PLANS: The following plan sheets shall be bound together in one plan set and
distributed to the City in the number and plan size as required.
I. Title Sheet
A. Location Map with Section, Range and Township provided.
B. Sheet Index.
C. Plan Date with all Revision Dates.
D. Preparer’s Name and Contact Information.
E. Owner’s Name and Contact Information.
II. Legend and Typical Sections
A. Plan Legend for all Applicable Symbols.
B. City of Lake Elmo Typical Sections as Applicable to the Project.
C. Additional Typical Sections as Deemed Appropriate by the Design Engineer.
III. Standard Details and Storm Sewer Construction Chart
A. City of Lake Elmo Standard Details as Applicable to the Project.
B. Additional Standard Details as Deemed Appropriate by the Design Engineer.
C. Storm Sewer Construction Chart.
IV. Grading, Drainage, and Erosion Control Plans
A. North Arrow (Up or to the right on all sheets).
B. Scale: 1”=50’ horizontal.
C. Maximum plan sheet size 22” x 34”.
Formatted: Top: 0.6", Bottom: 0.6", Footer distance from
edge: 0.41"
Formatted: Indent: Left: 0.25"
City of Lake Elmo Revision Date: March 2017February 2015 Page 2 of 7
Plan Sheet Format Requirements
D. Building pads with garage floor elevation, low floor elevation, low opening elevation and
building type.
E. All proposed lot corner elevations.
E.F. Wetland delineations and wetland buffers, creeks, streams, lakes & other water bodies.
G. Existing and proposed normal water level (NWL) and high water level (100‐year HWL) for
all water bodies within and adjacent to the property, including proposed high water level
(100‐year HWL) for infiltration basins.
H. Proposed high water level (100‐year HWL) contour for all storm water ponds and
infiltration basins.
F. Normal water level (NWL) and high water level (100‐year HWL) for all water bodies within
and adjacent to the property.
G.I. All emergency overflow elevations, placed in BOLD on the plans.
H.J. All erosion control measures, permanent and temporary.
I.K. Grading and erosion control City standard plan notes.
J.L. Tree protection fencing.
K.M. Spot elevations for significant trees to be saved.
L.N. Retaining Walls (wall heights and elevations).
M.O. Existing storm sewer, drainage and culvert structures to a distance of 150 feet beyond
plat boundary with pipe material, size and inverts.
N.P. Topographical features to a distance of 150 feet beyond plat boundary (fences, trails,
sidewalks, streets, driveways, etc.)
O.Q. Property, right‐of‐way and easement lines.
P.R. Existing street and driveway widths with type of surface identified.
V. Sanitary Sewer and Watermain Plan Sheets:
A. Plan and Profiles for Sanitary Sewer and Watermain shall be placed on the same sheet(s).
B. The following information shall be shown:
1. North Arrow (Up or to the right on all sheets).
2. Scale: 1”=50’ horizontal and 1”=10’ or 1”=5’ vertical (Maximum sheet size 22” x 34”)
3. Street names & right‐of‐way lines.
4. Lot and block numbers.
5. Location of all existing utilities with pipe material and size.
6. Existing and proposed easements.
7. Size of mains.
8. Material and Class of pipe.
9. Length of mains and each sanitary sewer pipe segment.
10. Size and type of manholes.
11. Proposed grade of each sanitary sewer pipe segment.
12. Elevation of inverts of all sanitary sewer lines, at MH and at stub ends.
13. Arrows indicating the direction of flow on the sanitary sewer plan views.
14. Number each sanitary sewer structure on both plan and profile views.
15. Stationing of sanitary sewer structures on profile view.
16. Proposed main line pipe crossings on the profile views.
17. Proposed storm sewer shown in plan and profile views (background view).
18. Service locations and wye stationing on the plan view (from the main line to
the utility easement line).
City of Lake Elmo Revision Date: March 2017February 2015 Page 3 of 7
Plan Sheet Format Requirements
19. Proposed invert elevations at the utility easement line. Risers must be listed for
each lot if needed.
20. Elevation of the top of the water service stop box at the utility easement line.
21. Hydrant, valve and fitting locations on the plan view (gate valve or butterfly
valve noted as applicable).
22. Proposed and existing pump or lift stations.
23. Proposed and existing Well Pumphouses.
24. Existing grade profile over main line pipe.
25. Finished grade profile over main line pipe.
26. Centerline stationing at 100 foot minimum intervals.
27. Sanitary Sewer City Standard Plan Notes.
28. Watermain City Standard Plan Notes.
VI. Street and Storm Sewer Plan Sheets:
A. Plan and Profile shall be shown on the same sheet.
B. The following information shall be shown:
1. North Arrow (Up or to the right on all sheets).
2. Scale: 1”=50’ horizontal and 1”=10’ or 1”=5’ vertical (Maximum sheet size 22” x 34”)
3. Street names.
4. Lot and block numbers.
5. Existing and proposed easements/right‐of‐ways.
6. Show concrete walks and bituminous paths.
7. Sizes of storm sewer pipe.
8. Material and Class of storm sewer pipe.
9. Length of each storm sewer pipe segment.
10. Proposed grades of each storm sewer pipe segment.
11. Proposed drainage swale locations, elevations, and grades.
12. Elevations on all inverts and castings of all storm sewer structures.
13. Arrows indicating the direction of flow on the storm sewer plan views.
14. Number of each storm sewer structure on both plan and profile views.
15. Proposed watermain and sanitary sewer shown in plan and profile views.
16. Proposed pipe crossings on the storm sewer profile views.
17. Existing grade profile over storm sewer pipe.
18. Finished grade profile over storm sewer pipe.
19. Finished centerline street elevations every 50 feet minimum.
20. Centerline stationing.
21. Street grades on profile.
22. Vertical curve data on profile.
23. Horizontal alignment and curve data on plan view.
24. Top of curb elevations at the beginning, mid‐point and end of all radii and at all
intersections where drainage is a concern, at maximum or at minimum grades.
25. Drainage flow arrows at street intersections.
26. Finished profile for centerline of trails (plan and profiles for trails may be on
separate sheets from street and storm sewer plans).
27. Storm Sewer City Standard Plan Notes.
28. Sidewalk and Trail City Standard Plan Notes.
C. Draintile Information to be Shown:
City of Lake Elmo Revision Date: March 2017February 2015 Page 4 of 7
Plan Sheet Format Requirements
1. Size, type and location of pipe on plan view.
2. Locations of service wyes and clean‐outs.
3. Arrows indicating the direction of flow on the draintile.
VII. Cross Sections
A. Cross sections shall be provided for all street reconstruction work, turn lanes, or when
interfacing new streets along existing streets and roadways.
B. Cross sections shall be provided for all trails, except when the trail is placed in the
boulevard in accordance with a typical standard street section.
C. At a minimum, each cross section shall show the following:
1. Finished ground to the match points of existing grade.
2. Existing ground.
3. Right‐of‐way and easement locations.
4. Centerline of proposed improvement.
5. Full depth proposed section.
6. Label all slopes proposed at maximum grades.
D. When provided, cross sections shall be shown a minimum of every fifty (50) feet, at all low
points, critical drainage locations, driveways, and at intersections.
VIII. Street Signage, Lighting, and Pavement Marking Plan
A. Signing, Pavement Markings, and Lighting City Standard Plan Notes.
IX. Landscape Plan Sheets
A. Irrigation Systems.
B. Include tree removals, planting schedule, and tree replacement plan.
C. Include City Standard Landscaping Plan Notes.
City of Lake Elmo Revision Date: March 2017February 2015 Page 5 of 7
Plan Sheet Format Requirements
RECORD DRAWINGS: Record drawings must be completed and submitted to the City Engineer to
assist the City in the review, verification and acceptance of the work completed. The submittal
information outlined below is considered the minimum documentation requirements. The City
Engineer may request additional information specific to the improvements as deemed reasonably
necessary to verify the work conforms to the approved grading and construction plans.
I. Submittal Requirements:
A. As‐built Construction Plans shall be certified by the engineer and prepared in accordance
with the Plan Sheet Format Requirements.
B. All changes from the final construction plans should be indicated on the as‐built
Construction Record Drawings. All changes shall be lined out and corrections shall be
shown in bold italics.
C. Each Record Drawing shall list Contractor’s name, Developer Engineer’s name, City Project
Number, Construction Completion Date, and Record Plan Drawing Number (provided by City).
D. Final record drawings shall be submitted as one (1) set of full size plans (22” x 34”), two
11” x 17” paper copies, and submitted in electronic form (CD) with DWG files and PDF files
that are printable to scale on 11”x17”.
E. As‐built surveyed information shall tie out to benchmarks as indicated on the plans.
F. GIS shape files must be provided to include all as‐built public infrastructure data.
II. Certified Record “As‐built” Grading Plan shall include:
A. Location and as‐built elevations at lot corners and house pads.
B. Location and as‐built elevations along all swales, berms, slopes and ditches.
C. Location and as‐built elevations at all emergency overflow (EOF) points.
D. All finished grades for pond cross sections.
E. Location and as‐built elevations at high water levels (HWL) for ponds and low points.
F. Location and as‐built for all storm sewer structures including inverts and overflows.
G. Location and as‐built elevations at all retaining walls, including top and bottom of wall at
maximum wall height locations.
H. Location and as‐built elevations for any private wells or wastewater systems.
I. Location and as‐built elevations for other features critical to drainage performance.
J. Contours for all HWL, wetland, and other water bodies, buffers and setbacks.
K. Property lines and easements.
L. Location of all existing utilities.
M. Sufficient as‐built elevation shots to substantiate 2‐foot contour lines.
M. As‐built grading plan must conform to the approved final grading plan. As‐built elevation
shots not within +/‐ 0.2 feet of proposed elevations are subject to rejection and re‐work at
the discretion of the City Engineer.
N. As‐built elevation shots must be within +/‐ 0.2 feet of proposed elevations.
O.
III. Certified Record “As‐built” Construction Plans shall include:
A. As‐built surveyed elevations for sanitary and storm sewer manhole and catch basin
casting/inlet tops and inverts, flared end section inverts, and any other structure
elevations shown on the as‐bid drawings. Actual elevations must be recorded to the
nearest 0.01 foot, and the actual pipe grades recorded to the nearest .01%.
B. Sanitary and storm sewer lines field measured from center of casting to center of casting
or from center of casting to end of flared end. Record lengths to nearest 0.5 foot.
Formatted: Indent: Left: 0.5", No bullets or numbering
City of Lake Elmo Revision Date: March 2017February 2015 Page 6 of 7
Plan Sheet Format Requirements
C. All changes from planned pipe, structure, or hydrant locations.
D. Measured distances from center of casting to end of stubs for sanitary and storm sewer.
E. Ties from ends of watermain stubs to permanent structures.
F. Ties for draintile cleanouts to permanent structures.
E.
F.G. Service ties for the curb box for each lot. Including pipe quantity, size and type on
plans.
G.H. All sewer services with stationing from downstream manhole to wye location. Pipe
quantity, type and invert elevation at utility easement line shall be shown on the property
served.
H.I. Location of watermain fittings (i.e. bends, tees, etc.).
I.J. Top nut of hydrant elevations.
J.K. All pipe insulation.
K.L. As‐built surveyed elevations for top of curb in sufficient quantity to verify street grades.
L.M. All lot address numbers shown on both utility and street record plans.
IV. Private Water/Wastewater Facilities: Record drawings shall be provided in the format
consistent with the requirements for public infrastructure as prescribed herein:
A. Tie information for all underground structures.
B. Location and as‐built elevations for any system structures, pipes, pipe slopes, pipe lengths,
valves, clean‐outs, and other facilities.
C. Property lines and easements for the facilities.
D. Detail on the plans any revisions or deviations from the approved design.
E. Operation & Maintenance manual including:
1. Operational performance characteristics for all pumps.
2. All electrical and control information including electrical console schematics.
3. All mechanical information, parts data, and operational instructions.
4. Facility Operation instructions and procedures.
5. Emergency mitigation measures.
6. Chemical treatment schedules.
7. Permit documentation and reporting requirements.
V. Public Infrastructure Inventory Requirements: Final quantity tabulations shall be submitted for
the following information:
A. Sanitary Sewer Pipe, by footage and pipe size.
B. Watermain, by footage and pipe size.
C. Number of Hydrants, Gate and Butterfly Valves, Manholes, Catch Basins, and Lift Stations.
D. Number of Sanitary Sewer Services, by pipe size.
E. Number of Water Services, by pipe size.
F. Number of Drain Tile Services, by pipe size.
G. Storm Sewer Pipe, by footage and pipe size.
H. Number of Pollution Control Structures (Sumps, Grit Chambers, Pond Skimmers), by type.
I. Number of Ponds and Sedimentation Basins, by type. Each listed with water surface area
and volume at NWL and HWL.
J. Number of Storm Sewer Outlet Structures, by size.
K. Number of Alternative Stormwater Drainage Facilities (BMP’s), by type of BMP.
L. Public Streets by lineal footage and square yard.
City of Lake Elmo Revision Date: March 2017February 2015 Page 7 of 7
Plan Sheet Format Requirements
M. Private Streets by lineal footage and square yard.
N. Sidewalks by lineal footage and square yard.
O. Trails by lineal footage and square yard.
CITY OF LAKE ELMO, MN | DESIGN STANDARDS MANUAL REVISION DATE: MARCH 2017FEBRUARY 2015
PAGE 1 of 9
ENGINEERING DESIGN STANDARDS
for
CITY OF LAKE ELMO
STREET DESIGN AND GEOMETRICS
Geometric Design, Local Residential Street
‐Minimum Street Width, back of curb to back of curb…………………… ………………………..….…28‐feet
‐Minimum Street Width (B‐B), parking one side (when allowed by City)…..……………..….…24‐feet
‐Minimum Street Width (B‐B), no parking (when allowed by City)……….……………………..…22‐feet
‐Minimum Street Width, one‐way lanes with center median…………….…………………………..19‐feet
‐Center Crown……………………………………………………………………………………………………………………2.5%
‐Minimum Longitudinal Grade……………………………………………………………………........................0.5%
‐Maximum Longitudinal Grade……………………………………………………………………………………………..8%
‐Maximum Intersection Approach Grade, First 50‐
feet………………………………………..…………….2.05%
‐Minimum Vertical Curve Length, Crest (including stop conditions).………………………….………K=19
‐Minimum Vertical Curve Length, Sag (including stop conditions)………………………………..……K=37
‐Minimum Horizontal Curve Radius………………………………………………………..………............….90‐feet
‐Intersection Angles………………………………………………………………………………………………...90 degrees
‐Tangent Length at Intersection from Curb Line, Local Streets…………………………………..…..50 feet
‐Tangent Length at Intersection from Curb Line, Higher Class Streets…….......................100 feet
‐Tangent Minimum between curves……………………………………………………………………..……….50 feet
‐Minimum Intersecting Street Offset, from Centerlines……………………………………………….150‐feet
‐Curb Radius, Minimum Local to Local…………………………………………………………………….…….20‐feet
‐Curb Radius, Minimum Local to Collector…………………………………………………………………....25‐feet
‐Minimum Diameter of Cul‐de‐sac……………………………….………………………………………………..90‐feet
‐Minimum Grade around Cul‐de‐sac…………………….............................................................…0.5%
‐Maximum Cul‐de‐sac Street Length (lots less than 2.5 acres)………………………................600‐feet
‐Maximum Cul‐de‐sac Street Length (lots equal or greater than 2.5 acres)……………....1,320‐feet
‐Temporary Cul‐de‐sac at plat line……………………………………………………………………….……..Required
Geometric Design, Collector Street
‐Design Standards………………………………………………Meeting State‐Aid for minimum design speed
‐Minimum Street Width, back of curb to back of curb………………..……..…………Varies (as
determined by City36‐feet min)
‐Maximum Longitudinal Grade…………………………………………………………………………………………..…6%
‐Intersection Angles………………………………………………………………………………………………...90 degrees
‐Tangent Length at Intersection from Curb Line, Local Streets…………………………………..…..50 feet
‐Tangent Length at Intersection from Curb Line………, Higher Class
Streets……………………………..….........................100 feet
‐Tangent Minimum between curves……………………………………………………………………..……….50 feet
‐Minimum Vertical Curve Length, Sag and Crest…….………..Meeting State‐Aid for minimum
design speed
‐Minimum Vertical Curve Length, Sag………………..Meeting State‐Aid for minimum design speed
Formatted: Top: 0.44", Footer distance from edge: 0.2"
CITY OF LAKE ELMO, MN | DESIGN STANDARDS MANUAL REVISION DATE: MARCH 2017FEBRUARY 2015
PAGE 2 of 9
‐Minimum Horizontal Curve Radius……………………Meeting ……………….State‐Aid for minimum
design speed
‐Minimum Intersecting Street Offset, if allowed, from Centerlines……..……..……………….250‐feet
‐Street/Roadway Access………………………………..Per City Access Management Spacing Guidelines
‐Driveway Access, Residential……………………….…………………………………………….…………...Prohibited
‐Driveway Access, Commercial…………….………..Per City Access Management Spacing Guidelines
‐Curb Radius....………………………………………………………………………………………………………….…..25‐feet
Pavement Section Design (Pavement sections below are minimum allowed. Additional pavement
section may be required based on Geotechnical Report of the subgrade soils).
‐Local Residential Street……………………………………………………………………….Minimum 7‐Ton Design
‐Subbase, Select Granular Borrow (SPEC 3149.2B)…….………………………….……Minimum 12‐inches
‐Subsurface Drainage System…………………………………………………………………………………..….Required
‐Base, Aggregate Base, Cl. 6 100% Crushed Stone Aggregate..……………………..Minimum 6‐inches
Note: Class 6 Recycled Material Substitute by City Engineer Approval
‐Non‐Wearing Course, MnDOT 2360 Type SP 12.5, Mixture 2B….……….…..….…………..2‐inches
‐Wearing Course, MnDOT 2360 Type SP 9.5, Mixture 2B..……………………..………………….1½‐inches
‐Collector Street and Above…………………………………………………………….….Minimum 10‐Ton Design
‐Subbase, Select Granular Borrow (SPEC 3149.2B)…….………………………….……Minimum 12‐inches
‐Subsurface Drainage System…………………………………………………………………………………..….Required
‐Base, Aggregate Base, Cl. 6 100% Crushed Stone Aggregate..……………………..Minimum 8‐inches
Note: Class 6 Recycled Material Substitute by City Engineer Approval
‐Non‐Wearing Course, MnDOT 2360 Type SP 12.5, Mixture 3C….……….…..…………………..2‐inches
‐Wearing Course, MnDOT 2360 Type SP 9.5, Mixture 3C..……………………..…………………….2‐inches
Draintile/Street Subsurface Drainage
‐Type……………………………………………………………………………………………………..…...Sch. 40 Rigid PVC
Perforated
‐Size……………………………………………………………………………………………………………………………..….4‐inch
‐Sock……………………………………………………………………………………………………….……MnDOT SPEC 3733
‐Location…...All Low Points in both directions; at 350 foot intervals, and Project Specific Design
‐Length……………………………Minimum 100‐foot runs; 100 feet in both directions from low points
‐Clean Outs…………………………………………………………………………Every 150 feet and at all dead ends
Curb and Gutter
‐Material, All Purposes………………………………………………………………………………………..………Concrete
‐Strength, Minimum Requirements…………………….……………………………………….…….…….…3,900 PSI
‐Type: New Developments, Single Family Residential……………………………………….…Surmountable
‐Type: Multifamily, Commercial, Collector Roads, Medians, Reconstruction………………….….B618
Utility Conduit
‐Type……………………………………………………………………………………….………………….….PVC Schedule 40
‐Location/Depth……………..Perpendicular to Street and minimum 1‐foot below Street Subgrade
Entrances/Driveways
‐Maximum Driveway Width at Right‐of‐way…………………………………..……Varies by Zoning District
Formatted: Font: 5 pt
CITY OF LAKE ELMO, MN | DESIGN STANDARDS MANUAL REVISION DATE: MARCH 2017FEBRUARY 2015
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‐Bituminous Driveway Minimum Thickness, Section…………………………………..…………Match Street
‐Residential Concrete Driveway Minimum Thickness……………………………………………………6‐inches
‐Commercial Concrete Driveway Minimum Thickness………………………………………..………..8‐inches
Signing
‐Design Standards………………………………………………………………………………………………………MMUTCD
‐Sheathing Type……………………………………………………………………….…Type IX Diamond Grade
(DG3)High Intensity Diamond Grade DG3
‐Sign Posts, green powdered painted galvanized
metal…..……………………..……………..….…………………………………..Pre‐Punched 14 ga. Square Tube3.0 LBS/ft
RIGHT‐OF‐WAY AND BOULEVARD LAYOUT
Right of Way Widths
‐Local Residential Street Minimum Width………………………………………..……………………………60‐feet
‐Cul‐de‐sacs……………….…………………………………………………………………………………..…..60‐foot radius
‐Collector Street Minimum Width………………………….…..…………………..…...Varies (as determined
by City80 feet Minimum))
Boulevard, Local Residential Street
‐
Width……………………………………………………………………………………………………...……………..…..…..……16‐feet
(15‐feet at cul‐de‐sacs)
‐Slope, Typical and Maximum………………………………………………………………..………………..4% and 4:1
‐Topsoil Minimum……………………………………………………………………………………..…………………….6‐inch
‐Turf Treatment…………………………………………………………………………………………………..……..Lawn Sod
‐Tree Location without Sidewalk or Trail……………………….................................8‐feet back of curb
‐Tree Location with Sidewalk or Trail…………………………………………….…..…………5‐feet back of curb
‐Street Light Location……………………………………………………………………………………5‐feet back of curb
‐Street Light Type/Pole…………………………………..……………………………………………….15‐foot California
Acorn w/Aluminum Pole (All Black)
‐Hydrant Location………………………………………..………………………………………….……..5‐feet back of
curb
Sidewalks
‐Collector Street…………………………….……………………………..………………...……Required on both sides
‐Local Residential Street…………………………….……………………………...……….……Required on one side
‐Cul‐de‐sac Street…………….………….……………………………….………………Required for trail connection
‐Width……………………………………………………………………………………………………...…………………..…6‐feet
‐Sidewalk Maximum Longitudinal Grade……………………………………………………………………………….6%
‐Pavement Section…………..…………………………………..………5‐inch Concrete; 4‐inch Select Granular
Trails
‐Locations…………………………………..……………………………..……....…Per City trail plan and as directed
‐Width, Local Trail……………….………………………………………………………………..………………………...8‐feet
Formatted: Indent: First line: 0.25", Tab stops: Not at 2.62"
CITY OF LAKE ELMO, MN | DESIGN STANDARDS MANUAL REVISION DATE: MARCH 2017FEBRUARY 2015
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‐Pavement Section, Local Trail…………..………………2.25‐inch Bituminous; 8‐inch minimum Class 5
‐Maximum Longitudinal Grade……………………………………………………………………………………………..8%
Berm Construction in Boulevard
‐Maximum Side Slope with Maintenance Requirements…………………………………………………......3:1
‐Maximum Side Slope with Natural Vegetation………………........................................................2:1
SANITARY SEWER
Force Main
‐Material……………………………………………………………………………………………………….……...PVC or HDPE
‐PVC, 2‐inch–24‐inch……….……………………………………………………………………………………… C900/C905
‐HDPE Class, 1‐inch…………………………………………………………………….…………………………………….S DR 9
‐HDPE Class, 2‐inch–24‐inch……………………………………………………….……………………………..…..SDR 11
‐Minimum Cover……………………………………………………………………………………………………..………7.58‐
Feet
‐Location of main in Street……………………………………………………………………….……….Project Specific
‐Tracer Wire………………………………………………………………...812 AWG solid, PRO‐TRACE HDD‐CCS
PE45
‐Air Relief Valve and Manhole Locations………………………………………………….………….All High Points
‐Clean Outs………………………………………………………………………………………………………….All Low Points
Gravity main
‐Material……………………………………………………………………………………………………………….…………….PVC
‐Minimum Diameter……………………………………………………………………………………..………………...8‐inch
‐Class, up to 20‐feet in depth………………………………………………………………………..………………..SDR 35
‐Class, 20‐25 feet in depth……………………………………………………………………………………….……..SDR 26
‐Class and Material, over 25 feet in depth………………………………………………………...Project Specific
‐Minimum cover over pipe……………………………………………………………………………………………5.5‐feet
‐Maximum depth of pipe……………………………………………………………………………………………….30‐feet
‐Slope……………………………………………………………………………………………..………..Ten States Standards
‐Tracer Wire…………………………………………………………………12 AWG solid, PRO‐TRACE HF‐CCS PE45
‐Location of main in Street………………………………………………………………………………………..Centerline
Sanitary Sewer Manholes
CITY OF LAKE ELMO, MN | DESIGN STANDARDS MANUAL REVISION DATE: MARCH 2017FEBRUARY 2015
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‐Type…………………………………………………………………………………………………………......Precast Concrete
‐Maximum inlet/outlet elevation difference…………………………………………………………………...2‐feet
‐Minimum depth of Manhole…………………………………………………………………….…………………….6‐feet
‐Type of Casting………………………………………………………………………………………………….……….R‐1642‐B
‐Joints and Assembly……………………………………………………………………………….………..Per City Details
‐Location………………………………………………………………………………………………..……….Street Centerline
‐Maximum Spacing………………………………………………………………………………………………..…….400‐feet
‐Flow Line Match Required……………………………………………………………………………………8/10ths Rule
‐Drop Across All Manholes Required………………………………………………………………………..……0.1‐feet
‐Connections to Existing Manholes………………………………………………………….….Core Drill with Boot
‐Outside drop minimum…………………………………………………………………………………………………..2‐feet
‐Outside drop Material….………………………………………………………………………………………..Ductile Iron
Service Pipe
‐Material…………………………………………………………………………………………………………….……………….PVC
‐Minimum Diameter…………………………………………………………………………………………………….....4‐inch
‐Class………………………………………………………………………………………………………………………….…..SCH 40
‐Tracer Wire…………………………………………………………………12 AWG solid, PRO‐TRACE HF‐CCS PE45
‐Drive‐In Magnesium Grounding Anode Rod……………........Copperhead Part # ANO‐1005 (1.5lb)
WATERMAIN
Water Service Pressures
‐Individual Booster Pumps required………………………………………………..……….development specific
Main Pipe
‐Material……………………………………………………………………………………………………….……………………..DIP
‐Class……………………………………………………………………………………………………………….………………CL. 52
‐Minimum Diameter – Mainline………..………………………………………………………….………………...8‐inch
‐Minimum Diameter – As allowed by City EngineerUnlooped Cul‐de‐
sac…..…………..………………….………………………..……….8‐inch
‐Minimum Diameter – Hydrant Lead……………………..……………………..………………………..……….6‐inch
‐Minimum Cover…….…………………………………………………………………………………………..…………7½‐feet
‐Maximum Length of Dead Ends…………………………………………………………………..………………61,000‐
feet ‐Air Release measures…………………………………………………………………………….…………….MH, Hydrant
‐Tracer Wire………………………………………………………………..…..128 AWG solid, PRO‐TRACE HF‐CCS
PE45
‐Location of main in Street……………….……………………………………………………………..….No rth or West
Hydrants
‐Type……………………………………………………………………………………….……...…...Waterous Pacer WB‐67
‐Depth of Bury…………………………...………………………………………………………………………………….8½‐feet
‐Maximum Coverage Radius, Residential..……….……………………………………………………..……500‐feet
‐Maximum Coverage Radius, Commercial…………….………………………………………………..……300‐feet
‐Gate valve on Hydrant
leads…………………………………………………………………………..…………………..Yes‐at Tee
CITY OF LAKE ELMO, MN | DESIGN STANDARDS MANUAL REVISION DATE: MARCH 2017FEBRUARY 2015
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‐Hydrant Nozzel………..…………………………………………………4‐inch Storz with Pentagon Nut end cap
‐Temporary dead end lines…………………………………….………Hydrant required (no air bleed valves)
Valves
‐Resilient Seat Gate Valve, for 12‐inch pipe & smaller…..……American Flow Control 2500 Series
‐Butterfly Valve, for pipe over 12‐inch………………………………….…..…………………Mueller Lineseal III
‐Valve Box………………………………………………...........................................................Tyler G‐Box6860
‐Maximum area isolated by valving………………………………………………………………………….20 services
‐Maximum distance between valves on Trunk Mains……………………………………………….….800‐feet
Service Pipe
‐Service Material…………………………………………………………………………….……………….Type “K” copper
‐Corporation Stop…………………………..…………………………………………….……….A.Y. McDonald 74701B
‐Curb Stop ………….…………………………………………………………………………………..A.Y. McDonald 76104
‐Curb Box …………………………………………………………………...A.Y. McDonald 5614 w/rod & Mpls. top
STORM SEWER
Design
‐Design Frequency for Storm Sewer……………………………………………………….…...………………..10‐year
‐Minimum storm sewer design velocity…………………………………………………………….………….……3‐fps
‐Maximum storm sewer design velocity…………………………………………………………………………..15‐fps
‐Maximum storm sewer outlet velocity…………….………………………………………………………….……5‐fps
‐Minimum Outfall Pipe Slope……………….Verify positive grade at completion (no reverse grade)
Main Pipe
‐Storm Sewer Pipe Material…………………………………………………………………………………………….….RCP
‐Minimum Cover Depth…………………………………………………………………………………………………...3‐feet
‐Minimum Pipe Diameter, Main…………………………………………………………………………………....15‐inch
‐Minimum Catch Basin Lead…………………………………………………………………………………………..12‐inch
‐Location of main in Street……………………………………………………………..…………………….South or East
Culvert pipe
‐Culvert Material, urban road or crossing public road……….…………………………………………….….RCP
‐Culvert Material, rural road private driveway….……………….……………………………………………...CMP
‐Minimum Culvert Size……………………………………………………………………………………………….....15‐inch
‐Apron and Trash Guard Required……………………………………………………………………………….……...Yes
Manholes
CITY OF LAKE ELMO, MN | DESIGN STANDARDS MANUAL REVISION DATE: MARCH 2017FEBRUARY 2015
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‐Type………………………………………………………………………………………………………………Precast Concrete
‐Sump Depth and
Location…………………..…....………………………………………………………………………………....4‐feet, located at
street prior to discharge pointN/A
‐Minimum Structure Depth………………………………………………………………………………………........4‐feet
‐Casting…………..……………………………………………………………………………………………………..…..R‐1642‐B
‐Minimum Adjustment Rings…………………………………………………………………………………….…………….2
‐Maximum Adjustment Rings…………………………………………………………………………………..……...1‐foot
Catch Basins
‐Type………………………………………………………………………………………………………..…….Precast Concrete
‐Minimum Structure Depth…………………………..…………………………………………….……………........4‐feet
‐Maximum run to Catch Basin………………………………………………………………….…………………..350‐feet
‐Casting, Curb & Gutter, B Style Curb………………….………………………………………………………..R‐3067V
‐Casting, Area Drain……………………………………………………………………..…………………………………R‐4342
STORMWATER MANAGEMENT AND STORMWATER BMPs
Note: Stormwater facilities shall be in accordance with the Requirements listed herein; in accordance with the
Requirements of the applicable watershed district; and in accordance with the Minnesota Pollution Control
Agency NPDES Construction Storm Water Permit. In addition, all “Recommended” and “Highly Recommended”
provisions of the Minnesota Stormwater Manual should be considered requirements by the City of Lake Elmo
unless specifically approved otherwise by the City Engineer.
Site Design
‐Facility locations….……………………………………………………………….……………….Outlots deeded to City
‐Location and Size………………..……………………………………………………………..……above 100‐year HWL
‐Building Lowest Floor above 100‐year HWL…………………………………………………………………….2‐feet
‐Building Lowest Opening above EOF…………………………………………………………………………….…1‐foot
‐Minimum access road width (located in Outlot)…………………………………………………………...20‐feet
‐Maximum grade for maintenance access roads………………………………………………………………...10%
‐Setback from building foundations……………………………………………………………………………….35‐feet
‐Flood Protection…….……………Overland Emergency Overflows Required (No landlocked basins)
Stormwater Ponds (Detention Basins)
‐Design Frequency (DF)………………………….…2, 10, and 100‐year, and 100‐year 10‐day snowmelt
‐Minimum Basin Depth to HWL.……………………………………………………………………………………….3‐feet
‐Maximum Pond Depth to HWL…………………….………………………………………………………..……..10‐feet
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‐Average Permanent Pool Depth………………………………..........................................4‐feet to 6‐feet
‐Permanent Pool Length‐to‐Width Ratio………………………………………………………….....3:1 or greater
‐Maintenance Bench Maximum side slope, first ten feet above Permanent Pool….………..….10:1
‐Aquatic Bench Maximum side slope, first ten feet into Permanent Pool….…………………...….10:1
‐Maximum side slope, beyond first ten feet…………….…………………………………..………………………3:1
‐Pretreatment Sediment Forebay……………………………………………….………………….…Required 10%
Pond Area
‐Required freeboard……………………………………………………………………………………..2‐feet above HWL
‐Pond Liner…………………………………………………………………………Clay lined per VBWD specifications
Drainage Swales
‐Maximum side slopes on Swales (maximum slopes allowed only when necessary)……….......3:1
‐Maximum side slopes on Right‐of‐Way Swales……………………………………………………….…………..4:1
‐Minimum longitudinal Swale grade…………………………………………………………………………..…........2%
‐Minimum Swale depth within Right‐of‐Way…………………………………………………..………...18‐inches
‐Minimum Bottom Width………………………………………………………………………………………………...4‐feet
Infiltration Facilities (Bioretention Areas and Rain Gardens)
‐Inlet control from Streets………….…Use Neenah R‐3067‐V casting on Catch Basin (no curb cuts)
‐Maintenance Agreement for public right‐of‐way..……………………………………………………..Required
‐Maintenance Access Easement..………………………………………………………………………………..Required
‐Minimum distance from septic system or drainfield………………………………………………….....35‐feet
‐Minimum distance from public or private well.…………………………..…………………………….....50‐feet
‐Maximum Site Slope……………………………………………………………………………………………………………5%
‐Minimum depth to Bedrock………………………………………………………………………………………..….5‐feet
‐Minimum depth to Seasonally High Water Table…………………………………………………………...5‐feet
‐Located in “hotspot” drainage shed (i.e. gas stations)……………………………………………..Prohibited
‐Located in Hydrologic Soil Group D Soils……………………………………..…………………………..Prohibited
‐Underdrain, Group C Soils (filtration)………………..…………………….…………………………………Required
‐Soil infiltration rates……………………………………………………….*By Field Testing at Facility Location
‐Minimum In‐situ Permeability……….………………………………………………………………..1‐inch per hour
‐Maximum side slope….……………………………………………………………………………………………………….4:1
‐Maximum drain dry time………………………………………….………………………………………………..48 hours
‐Soil medium……………………………………….…………………….…MnDOT 3877 E Rooting Topsoil Borrow
‐SeedingPlantings………………………………………….Seed per ....................MnDOT 3876
Specifications with Type 33‐261
‐Plantings………………………………………Planted in conformance with City approved landscape plan
………………………………………………………………….Seed to be enhanced with 1 plug per 4 Square
Feet
…………………………….….Infiltration areas 10,000 sqft or greater requires 3 grass mixes for variety
………………………Native Shrubs to be planted in conformance with City approved landscape plan
* Soil borings are required to verify infiltration rates. Borings must be taken to a depth of 520
feet below proposed infiltration basin elevation.
Minimum 2 borings per facility up to 5,000 SF. of infiltration area.
Minimum 3 borings per facility up to 10,000 SF. of infiltration area.
CITY OF LAKE ELMO, MN | DESIGN STANDARDS MANUAL REVISION DATE: MARCH 2017FEBRUARY 2015
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Additional boring required for every additional 2,500 SF. of infiltration area.
Other Stormwater BMPs: The City of Lake Elmo has adopted the following additional BMPs and Low
Impact Development practices for the City and promotes their use in accordance with these
Engineering Design Standards and the applicable City Code.
Open Space Developments in applicable Zoning Districts.
Narrow Streets through minimized street width standards.
Stormwater Reuse.
Infiltration/filtration Practices.
Filtration Facilities.
Vegetated Swales (Ribbon Curbs and Curbless Streets in applicable Zoning Districts).
Temporary Erosion and Sedimentation Control using Engineering Standards Manual.
Stormwater Site Design.
‐Conservation of open spaces to protect a site’s natural areas.
‐Impervious lot coverage credits for Stormwater BMPs.
‐Use of Pervious Pavements.
‐Adoption of Minimal Impact Design Standards (MIDS) to mimic predevelopment
hydrology.
‐Reproduce predevelopment hydrology.
‐Incorporation of Landscaping and use of Native Vegetation.
DETAIL PLATE NUMBERS AND PLAN NOTES
Pipe Installation 101,103,105
Watermain 200A,201,203,204,206,207A,207B,208,210,211
Sanitary Sewer 300A,301,302,303,305,306,311,313,314,315
Storm Sewer 400A,402,404,405,406,407,408,409,410,411,
411,412,416,417,419,420,421
Pavements, Curbs, Walks
500A,501,502,504,505,506,507A,507B,507C,508,509
507D,507E,508,509,510,511,512,513,514
Erosion Control 600A,600B,600C,600D,601,603,604,605,606
Miscellaneous 700A,706,712,713
Typical Sections and Right‐of‐Way 801,804,805,806,807A,807B
Signing/Pavement Markings/Lighting Landscaping
900A,901A,901B,902A,902B,,903A,903B,904
208
STANDARD DRAWING NO.
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CITY OF LAKE ELMO
MARCH 2017
514
STANDARD DRAWING NO.
LAKE ELMO
CITY OF LAKE ELMO
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902
STANDARD DRAWING NO.
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CITY OF LAKE ELMO
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903
STANDARD DRAWING NO.
LAKE ELMO
CITY OF LAKE ELMO
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