HomeMy WebLinkAboutResolution No. 513-17 - 2017Subdivision&Non-ResidentialLotGradingPlanChecklist
RESOLUTION
BE IT RESOLVED by the Common Council of the City of Rochester that the City adopt the
2017 Subdivision and Non-Residential Lot Grading Plan Checklist. A copy of the checklist is
attached.
PASSED AND ADOPTED BY THE COMMON COUNCIL OF THE CITY OF
ROCHESTER, MINNESOTA, THIS __________ DAY OF _______________, 2017.
___________________________________
PRESIDENT OF SAID COMMON COUNCIL
ATTEST: __________________________
CITY CLERK
APPROVED THIS _____ DAY OF ______________________, 2017.
________________________________
MAYOR OF SAID CITY
(Seal of the City of
Rochester, Minnesota)
Res15\\PW\\Adopt.GradingPlanChecklists.17
SUBDIVISION AND NON-RESIDENTIAL LOT
GRADING PLAN CHECKLIST
Revised November 2017
Key
Site:
= Yes
Prepared By: Date:
= No
Blank = Not Applicable
Reviewed By: Date:
Temporary stockpiles include additional sediment control
GENERAL
and temporary cover after 14 days (7 days if discharging to
Completed grading permit application form.
and within 1 mile of impaired water).
Final grading plan is signed by a licensed professional.
Soil within 1 mile of impaired water stabilized within 7
Submitted signed Drainage Report per City template.
days.
Provide owner name, mailing address and email address.
Percent of slope is shown for streets and drainage swales.
Provide SWPPP for projects requiring the MPCAs
Fill & cut property line setbacks are >2' for cut slope ht.
Construction Stormwater Permit.
> 10' or fill slope ht. >4'; setback is dimensioned on the
plans.
Plan is drawn in two-foot contours. All finished contours
All proposed lot corner elevations are shown.
and adequate existing contours are labeled.
Proposed elevations of garage, lowest floor, ground at front
Existing contours are dashed and proposed are solid.
and rear of building, along with the structure type.
Directional arrows are shown for proposed drainage.
Details of terrain and drainage are provided for areas
Top of foundation is minimum 6 above the ground.
adjacent to the proposed grading.
Grade l' below top of foundation 10' from building.
Existing public and private utilities are shown.
Freeboard to structures. Floor el. or the grade adjacent to the
Areas not to be disturbed clearly defined.
building is at least l' above any overflow elevation or at least
ALL receiving waters, including wetlands, within 1 mile
2' above any pond 100-year water level, whichever is
shown or identified, including impaired waters.
greater. Minimum l' above FEMA flood elevation.
Property limits are shown, streets are labeled, lot & block
Drainage flows away from structures at min. 2%.
information provided, and street address shown, if known.
Temporary or permanent diversion swales, stabilized with
County/MnDOT permit obtained for work in their ROW.
turf mat, pipe, riprap, are used at the top of slopes exceeding
Substantial Land Alteration approved for elevation changes
4:1, when applicable.
>
Minimum lot slopes for vegetated areas are 2% minimum.
All City Council approval conditions are met.
Temporary or permanent cover is indicated for all disturbed
The following areas are tabulated for residential (acres):
areas. Temporary seeding specifies seed mix including disk
Total platted area (site area)
anchored mulch on all slopes > 200' or > 5% slope.
Total area disturbed
Permanent cover specifies 4" min. topsoil, seed mix and disk
Total developable area (excluding floodway, natural
anchored mulch, or 4" min. topsoil and sod.
steep slopes, & wetlands).
Slopes steeper than 4:1 and 4:1 slopes longer than 30' are
The following areas are tabulated for non-residential
seeded and protected with erosion control blankets (MnDOT
(acres):
3885.1) or sodded and staked.
Total project area; total disturbed area
Statement that slopes steeper than 4:1 are stable from land-
Total impervious areas of project, existing & proposed.
sliding and surface erosion. Geotechnical report for slopes
Tabulation of total and impervious area by tax parcel.
>3:1.
Schedule of BMP installation shown.
For sites where temporary or permanent cover will not be
BMP details included are City standard plates referenced.
complete by November 15, plan provides adequate measures
Concrete washout management and waste control BMP
to control spring erosion and sedimentation.
addressed on plan.
Dewatering activities discharge to treatment facility.
DRAINAGE SWALES & EASEMENTS
Per the NPDES Construction Storm Water Permit, the date
Drainage and Utility easements are shown and labeled.
and amount of all rainfall events greater than ½ inch in 24
hours must be documented. Rainfall amounts must be
Drainage easements are provided where concentrated flow is
obtained from a properly maintained rain gage installed on
received from more than 1 adjacent lot and also where
site, a weather station within 1 mile of the site, or a weather
concentrated flow is received from more than 1 acre of
reporting system that provides site specific rainfall data from
adjacent property. 100-year flow contained in easement.
radar summaries.
Minimum drainage easement for flows from 1 acre or less or
4 lots or less are a minimum of 15' wide. Ditch is
SITE GRADING, SEDIMENT & EROSION CONTROL
1.9' deep V -shaped with 4:1 slopes.
All erosion and sediment control shall conform to the
Minimum drainage easements for flows from more than 1
provisions of the MPCAs Construction Stormwater Permit.
acre or more than 4 lots are a minimum of 20' wide. Ditch is
Down-slope sediment control scheduled before grading.
a minimum of 2' deep with a 4' bottom and 4:1 slopes up to
Adjacent property protected from drainage and sediment.
the easement line. 100-year runoff contained in easement.
Stabilized vehicle exit(s) are provided.
Control elevations for drainage ways are provided.
Silt fences are provided.
Minimum slope of small drainage swales is 2%.
All storm sewer inlets, existing and proposed, have inlet
protection/ that remains until up-slope areas are stabilized.
Maximum unbroken 3:1 or steeper slope of 75 feet.
systemand discharge volume is lessthan 110% of the pre-
DRAINAGE SWALES & EASEMENTS (continued)
Drainage easements for flow from more than 1 acre or 4 lots developed condition.
are seeded and protected with erosion control blankets or Pipe outlet energy dissipation complete within 24 hours of
sodded. Blanket category specified per MnDOT 388S.1. connection to surface water or outlet.
Plan depicts required blanket locations. Evaluation of downstream adequacy provided (capacity &
Velocity computations are provided for drainage easements stability).
where concentrated flow from more than 2 acres or 8 lots is
POST CONSTRUCTION STORMWATER MANAGMENT
directed. Where 10-year velocities exceed 5 ft/sec,
For construction activity adding one or more acres of
permanent turf reinforcement mats are installed per City std.
cumulative impervious surface area as a single project or
plate 7-07. Mats per MnDOT 3888.1 or manufacturer and
common plan of development, all provisions of
product is specified. Plan depicts blanket locations and cross
Construction Stormwater Permit for Permanent Stormwater
sections.
Management Systems shall apply, along with the items
Easement documents are signed and submitted to Public
below.
Works with recording fee or included in plat.
BMPs shall be implemented with highest preference given to
Ditches within 200' of surface water or Property line
Green Infrastructure techniques and practices, e.g.
stabilized in 24 hours after connection
infiltration, evapotranspiration, etc., necessary to meet the
following Post Construction Stormwater Management
STORM DRAIN SYSTEM, INLETS, & OVERFLOWS
conditions on the site of a construction activity disturbing
Atlas 14 Intensity-Duration-Frequency (IDF) curve must be
one acre or more or smaller projects part of a common plan
used when designing storm sewer system using the rational
of development to the maximum extent practicable:
method. If storm sewer is designed using SCS
For new development no net increase from pre-project
methodologies, the 10 year design event rainfall depth must
conditions for stormwater volume, TSS and TP.
be used.
For redevelopment a net reduction from pre-project
The Neenah curb opening calculator (or approved equal)
conditions for stormwater volume, TSS and TP.
shall be used to verify that double catch basins are spaced
Limitations prohibiting the use of infiltration techniques
appropriately to maximize capture efficiency.
include:
All storm sewer structure invert and rim elevations are
Where industrial stormwater permits do not authorize
labeled along with pipe size and types.
infiltration practices
Where vehicle fueling and maintenance occur
400' max. manhole spacing for pipes 15" diameter or less.
Where less than 3 feet separation is present between
500' max. manhole spacing for pipes 18" to 30" diameter.
bottom of BMP and bedrock and/or saturated soils
Drainage from subdrains, sump pumps, and building storm
Where high levels of contaminants in soil or groundwater
drains does not connect directly to public storm sewer.
will be transported
Not more than 3 CBs in a series (at an intersection) before
Infiltration shall be restricted without higher engineering
connecting to the storm sewer main.
review and substantiation sufficient to provide a functioning
Storm sewer trunk generally does not flow through CBs.
treatment system and prevent adverse impacts to
groundwater when an infiltration BMP will be constructed in
Drainage does not cross intersections (no valley gutters).
areas:
CB spacing as necessary for inlet capacity and spread width
With predominantly HSG D soils
that does not exceed 1000' on residential streets or 600' on
Within 1,000 feet up-gradient or 100 feet down-gradient
collector and arterial streets.
of active karst features
Storm sewer inlets include trash racks per City standards.
Within a DWSMA
With exception of single family homes, stormwater runoff
Where soil infiltration rates exceed 8.3 inches/hour
from impervious surfaces is collected on-site and not sheet
Lesser volume control on the site of the original construction
drained onto sidewalks, rights of way or adjacent property.
activity may be allowed under the following circumstances:
Concentrated drainage is collected in CB before crossing
Where any of the infiltration related limitations described
walk.
above are present
Emergency overflows are provided that limit depth of
The owner and/or operator of the construction activity
ponding in the street to 2' or less.
implements to the maximum extent practicable, volume
Emergency overflow with the high point elevation and
reduction techniques, other than infiltration on the site of
direction of overflow are clearly marked on plans.
the original construction activity that reduces stormwater
discharge volume, but may not meet the full Post
Emergency overflow meets minimum drainage easement
Construction Stormwater Management requirements.
standards.
For linear projects where lack of ROW precludes the
installation of volume control practices that meet the
OUTLETS & ENERGY DISSIPATION
conditions of Post Construction Stormwater Management,
Energy dissipation and scour protection shall be provided at
lesser volume control may be allowed so long as a
storm sewer and culvert outfalls in accordance with City
reasonable attempt be made to obtain ROW during planning.
and/or MnDOT standards.
Where volume control practices cannot be implemented on
Stormwater discharge onto slopes steeper than 10% shall be
site of original construction activity,
prohibited unless discharge is into existing conveyance
All BMPs shall be designed in accordance with City and/or
Minnesota Stormwater Manual standards
ADDITIONAL NOTES: