[Adopted 6-27-2016 by Ord. No. 2016-03[1]]
[1]
Editor's Note: This ordinance also repealed former Art. III,
Post-Construction Stormwater Management, adopted 6-9-2008, as amended.
A.
This article is adopted by the Town Board under the authority granted
by § 60.627, Wis. Stats., for towns. This article supersedes
all provisions of an ordinance previously enacted under § 60.62,
Wis. Stats., that relate to stormwater management regulations. Except
as otherwise specified in § 60.627, Wis. Stats., § 60.62,
Wis. Stats., applies to this article and to any amendments to this
article.
B.
The provisions of this article are deemed not to limit any other
lawful regulatory powers of the same governing body.
C.
The Town Board hereby designates the administering authority to administer
and enforce the provisions of this article.
D.
The requirements of this article do not pre-empt more stringent stormwater
management requirements that may be imposed by any of the following:
The Town Board finds that uncontrolled, post-construction runoff
has a significant impact upon water resources and the health, safety
and general welfare of the community and diminishes the public enjoyment
and use of natural resources. Specifically, uncontrolled post-construction
runoff can:
A.
Degrade physical stream habitat by increasing stream bank erosion,
increasing streambed scour, diminishing groundwater recharge, diminishing
stream base flows and increasing stream temperature.
B.
Diminish the capacity of lakes and streams to support fish, aquatic
life, recreational and water supply uses by increasing pollutant loading
of sediment, suspended solids, nutrients, heavy metals, bacteria,
pathogens and other urban pollutants.
C.
Alter wetland communities by changing wetland hydrology and by increasing
pollutant loads.
D.
Reduce the quality of groundwater by increasing pollutant loading.
E.
Threaten public health, safety, property and general welfare by overtaxing
storm sewers, drainageways, and other minor drainage facilities.
F.
Threaten public health, safety, property and general welfare by increasing
major flood peaks and volumes.
G.
Undermine floodplain management efforts by increasing the incidence
and levels of flooding.
A.
Purpose. The general purpose of this article is to establish long-term,
post-construction runoff management requirements that will diminish
the threats to public health, safety, welfare and the aquatic environment.
Specific purposes are to:
(1)
Further the maintenance of safe and healthful conditions.
(2)
Prevent and control the adverse effects of stormwater; prevent and
control soil erosion; prevent and control water pollution; protect
spawning grounds, fish and aquatic life; control building sites, placement
of structures and land uses; preserve ground cover and scenic beauty;
and promote sound economic growth.
(3)
Control exceedance of the safe capacity of existing drainage facilities
and receiving water bodies; prevent undue channel erosion; control
increases in the scouring and transportation of particulate matter;
and prevent conditions that endanger downstream property.
B.
Intent. It is the intent of the Town Board that this article regulates
post-construction stormwater discharges to waters of the state. This
article may be applied on a site-by-site basis. The Town Board recognizes,
however, that the preferred method of achieving the stormwater performance
standards set forth in this article is through the preparation and
implementation of comprehensive, systems-level stormwater management
plans that cover hydrologic units, such as watersheds, on a municipal
and regional scale. Such plans may prescribe regional stormwater devices,
practices or systems, any of which may be designed to treat runoff
from more than one site prior to discharge to waters of the state.
Where such plans are in conformance with the performance standards
developed under § 281.16, Wis. Stats., for regional stormwater
management measures and have been approved by the Town Board, it is
the intent of this article that the approved plan be used to identify
post-construction management measures acceptable for the community.
A.
Applicability.
(1)
Where not otherwise limited by law, this article applies to all post-construction sites, unless the site is otherwise exempt under § 145-35A(2).
(2)
A post-construction site that meets any of the following criteria
is exempt from the requirements of this article.
(a)
One- and two-family residential dwellings that are not part
of a larger common plan of development or sale and that result in
less than one acre of disturbance.
(b)
Nonpoint discharges from agricultural activity areas.
(c)
Nonpoint discharges from silviculture activities.
(d)
Mill and crush operations.
(3)
Notwithstanding the applicability requirements in § 145-35A(1), this article applies to post-construction sites of any size that, in the opinion of the administering authority, is likely to result in runoff that exceeds the safe capacity of the existing drainage facilities or receiving body of water, that causes undue channel erosion, that increases water pollution by scouring or the transportation of particulate matter or that endangers property or public safety.
B.
Jurisdiction. This article applies to post-construction sites within
the boundaries and jurisdiction of the Town of Lawrence.
C.
Exclusions. This article is not applicable to activities conducted
by a state agency, as defined under § 227.01(1), Wis. Stats.,
but also including the office of District Attorney, which is subject
to the state plan promulgated or a memorandum of understanding entered
into under § 281.33(2), Wis. Stats.
As used in this article, the following terms shall have the
meanings indicated:
Maintenance of sufficient vegetation types and densities
such that the physical integrity of the streambank or lakeshore is
preserved. Self-sustaining vegetative cover includes grasses, forbs,
sedges and duff layers of fallen leaves and woody debris.
A governmental employee or agent that is designated by the
Town Board to administer this article.
The part of the farm where there is planting, growing, cultivating
and harvesting of crops for human or livestock consumption and pasturing
or outside yarding of livestock, including sod farms and silviculture.
Practices in this area may include waterways, drainage ditches, diversions,
terraces, farm lanes, excavation, filling and similar practices. The
agricultural activity area does not include the agricultural production
area.
The part of the farm where there is concentrated production
activity or impervious surfaces. Agricultural production areas include
buildings, driveways, parking areas, feed storage structures, manure
storage structures, and other impervious surfaces. The agricultural
production area does not include the agricultural activity area.
The National Oceanic and Atmospheric Administration (NOAA)
Atlas 14 Precipitation-Frequency Atlas of the United States, Volume
8 (Midwestern States), published in 2013.
A typical calendar year of precipitation as determined by
the Wisconsin DNR for users of models such as SLAMM, P8, or equivalent
methodology. The average annual rainfall is chosen from a Wisconsin
DNR publication for the location closest to the municipality.
Structural or nonstructural measures, practices, techniques
or devices employed to avoid or minimize soil, sediment or pollutants
carried in runoff to waters of the state.
A day the office of the Town Hall is routinely and customarily
open for business.
A court-issued order to halt land-disturbing construction
activity that is being conducted without the required permit.
A system for conveying both sanitary sewage and stormwater
runoff.
A development or sale where multiple separate and distinct
land-disturbing construction activities may be taking place at different
times on different schedules but under one plan. A common plan of
development or sale includes, but is not limited to, subdivision plats,
certified survey maps, and other developments.
An impervious surface connected to the waters of the state
via a separate storm sewer, an impervious flow path, or a minimally
pervious flow path.
An area upon which one or more land-disturbing construction
activities occur, including areas that are part of a larger common
plan of development or sale.
A hypothetical discrete rainstorm characterized by a specific
duration, temporal distribution, rainfall intensity, return frequency,
and total depth of rainfall. The TP-40, Type II, twenty-four-hour
design storms for Town of Lawrence are: one-year, 2.2 inches; two-year,
2.5 inches; five-year, 3.2 inches; ten-year, 3.7 inches; twenty-five-year,
4.3 inches; fifty-year, 4.8 inches; and one-hundred-year, 5.1 inches.
The Atlas 14, MSE4, twenty-four-hour design storms for the Town of
Lawrence are: one-year, 2.05 inches; two-year, 2.37 inches; five-year,
2.94 inches; ten-year, 3.45 inches; twenty-five-year, 4.22 inches;
fifty-year, 4.87 inches; and one-hundred-year, 5.56 inches.
Residential, commercial, industrial, institutional, or other
land uses and associated roads.
Wells, sinkholes, swallets, fractured bedrock at the surface,
mine shafts, nonmetallic mines, tile inlets discharging to groundwater,
quarries, or depressional groundwater recharge areas over shallow
fractured bedrock.
The creation from one or more parcels or building sites of
additional parcels or building sites where such creation occurs at
one time or through the successive partition within a five-year period.
The area of the infiltration system that is used to infiltrate
runoff and does not include the area used for site access, berms or
pretreatment.
The process by which the land's surface is worn away by the
action of wind, water, ice or gravity.
Waters listed in § NR 102.11, Wis. Adm. Code.
Development in existence on October 1, 2004, or development
for which a stormwater permit in accordance with Subchapter III of
Ch. NR 216, Wis. Adm. Code, was received on or before October 1, 2004.
The unincorporated area within three miles of the corporate
limits of a first-, second- or third-class city, or within 1.5 miles
of a fourth-class city or village.
Soil that has at least a three-foot-deep layer with at least
20% fines; or at least a five-foot-deep layer with at least 10% fines;
or an engineered soil with an equivalent level of protection as determined
by the administering authority for the site.
That all land-disturbing construction activities at the construction
site have been completed and that a uniform, perennial, vegetative
cover has been established, with a density of at least 70% of the
cover, for the unpaved areas and areas not covered by permanent structures,
or that employ equivalent permanent stabilization measures.
A performance bond, maintenance bond, surety bond, irrevocable
letter of credit, or similar guarantees submitted to the administering
authority by the responsible party to assure that requirements of
this article are carried out in compliance with the stormwater management
plan.
Town Board of Supervisors, County Board of Supervisors, City
Council, Village Board of Trustees or Village Council.
Has the meaning given in § 340.01(22), Wis. Stats.
Has the meaning given in § 84.013(1)(b), Wis. Stats.
Has the meaning given in § 84.013(1)(c), Wis. Stats.
Has the meaning given in § 84.013(1)(d), Wis. Stats.
An area that releases as runoff all or a large portion of
the precipitation that falls on it, except for frozen soil. Rooftops,
sidewalks, driveways, parking lots and streets are examples of surfaces
that typically are impervious. Gravel surfaces are considered impervious,
unless specifically designed to encourage infiltration.
An undeveloped area of land or new development area located
within an existing urban sewer service area, surrounded by development
or development and natural or man-made features where development
cannot occur. "In-fill" does not include any undeveloped area that
was part of a larger new development for which a stormwater permit
in accordance with Subchapter III of Ch. NR 216, Wis. Adm. Code, was
required to be submitted after October 1, 2004, to the Wisconsin Department
of Natural Resources or Wisconsin Department of Safety and Professional
Services (formerly Department of Commerce).
The entry and movement of precipitation or runoff into or
through soil.
A device or practice, such as a basin, trench, rain garden
or swale, designed specifically to encourage infiltration but does
not include natural infiltration in pervious surfaces such as lawns,
redirecting of rooftop downspouts onto lawns or minimal infiltration
from practices, such as swales or roadside channels, designed for
conveyance and pollutant removal only.
Any man-made alteration of the land surface resulting in
a change in the topography or existing vegetative or nonvegetative
soil cover, that may result in runoff and lead to an increase in soil
erosion and movement of pollutants into the municipal separate storm
sewer or waters of the state. Land-disturbing construction activity
includes clearing and grubbing, demolition, excavating, pit trench
dewatering, filling and grading activities, and soil stockpiling.
A legal document that provides for long-term maintenance
of stormwater management and best management practices.
The highest level of performance that is achievable but is
not equivalent to a performance standard identified within this article.
Maximum extent practicable applies when the permit applicant demonstrates
to the administering authority's satisfaction that a performance standard
is not achievable and that a lower level of performance is appropriate.
In making the assertion that a performance standard is not achievable
and that a level of performance different from the performance standard
is the maximum extent practicable, the permit applicant shall take
into account the best available technology, cost effectiveness, geographic
features, and other competing interests such as protection of public
safety and welfare, protection of endangered and threatened resources,
and preservation of historic properties.
Reconstruction of a highway that is limited to 1.5 miles
in continuous or aggregate total length of realignment and that does
not exceed 100 feet in width of roadbed widening, and that does not
include replacement of a vegetated drainage system with a nonvegetated
drainage system except where necessary to convey runoff under a highway
or private road or driveway.
A specific precipitation distribution developed by the USDA,
NRCS, using precipitation data from Atlas 14.
Has the meaning given in § 30.01(4m), Wis. Stats.
That portion of a post-construction site where impervious
surfaces are being created or expanded. Any disturbance where the
amount of impervious area for the post-development condition is greater
than the predevelopment condition is classified as new development.
For purposes of this article, a post-construction site is classified
as new development, redevelopment, routine maintenance, or some combination
of these three classifications as appropriate.
Located outside the property boundary described in the permit
application.
Located within the property boundary described in the permit
application.
Has the meaning given in § NR 115.03(6), Wis. Adm.
Code.
Waters listed in § NR 102.10, Wis. Adm. Code.
The percentage of a given sample of soil which passes through
a No. 200 sieve.
A narrative or measurable number specifying the minimum acceptable
outcome for a facility or practice.
A written authorization made by the administering authority
to the applicant to conduct land-disturbing construction activity
or to discharge post-construction runoff to waters of the state.
A sum of money paid to the administering authority by the
permit applicant for the purpose of recouping the expenses incurred
by the authority in administering the permit.
An area that releases as runoff a small portion of the precipitation
that falls on it. Lawns, gardens, parks, forests or other similar
vegetated areas are examples of surfaces that typically are pervious.
Has the meaning given in § 283.01(13), Wis. Stats.
Has the meaning given in § 281.01(10), Wis. Stats.
A construction site following the completion of land-disturbing
construction activity and final site stabilization.
The extent and distribution of land cover types present after
the completion of land-disturbing construction activity and final
site stabilization.
The extent and distribution of land cover types present before
the initiation of land-disturbing construction activity, assuming
that all land uses prior to development activity are managed in an
environmentally sound manner.
Has the meaning given in § NR 140.05(17), Wis.
Adm. Code.
That portion of a post-construction site where impervious
surfaces are being reconstructed, replaced, or reconfigured. Any disturbance
where the amount of impervious area for the post-development condition
is equal to or less than the predevelopment condition is classified
as redevelopment. For purposes of this article, a post-construction
site is classified as new development, redevelopment, routine maintenance,
or some combination of these three classifications as appropriate.
Any entity holding fee title to the property or other person
contracted or obligated by other agreement to implement and maintain
post-construction stormwater BMPs.
That portion of a post-construction site where predevelopment
impervious surfaces are being maintained to preserve the original
line and grade, hydraulic capacity, drainage pattern, configuration,
or purpose of the facility. Remodeling of buildings and resurfacing
of parking lots, streets, driveways, and sidewalks are examples of
routine maintenance, provided the lower 1/2 of the impervious surface's
granular base is not disturbed. The disturbance shall be classified
as redevelopment if the lower 1/2 of the granular base associated
with the predevelopment impervious surface is disturbed or if the
soil located beneath the impervious surface is exposed. For purposes
of this article, a post-construction site is classified as new development,
redevelopment, routine maintenance, or some combination of these three
classifications as appropriate.
Stormwater or precipitation, including rain, snow or ice
melt, or similar water that moves on the land surface via sheet or
channelized flow.
Settleable solid material that is transported by runoff,
suspended within runoff or deposited by runoff away from its original
location.
A conveyance or system of conveyances, including roads with
drainage systems, streets, catch basins, curbs, gutters, ditches,
constructed channels or storm drains, which meets all of the following
criteria:
Activities including tree nursery operations, tree harvesting
operations, reforestation, tree thinning, prescribed burning, and
pest and fire control. Clearing and grubbing of an area of a construction
site is not a silviculture activity.
The entire area included in the legal description of the
land on which the land-disturbing construction activity occurred.
An order issued by the administering authority which requires
that all construction activity on the site be stopped.
A comprehensive plan designed to reduce the discharge of
pollutants from stormwater after the site has undergone final stabilization
following completion of the construction activity.
A comprehensive plan designed to reduce the discharge of
runoff and pollutants from hydrologic units on a regional or municipal
scale.
A performance standard that will apply in a specific area
where additional practices beyond those contained in this article
are necessary to meet water quality standards. A total maximum daily
load is an example of a targeted performance standard.
A document that specifies design, predicted performance and
operation and maintenance specifications for a material, device or
method.
An edge, or point on the landscape, landward from the ordinary
high-water mark of a surface water of the state, where the slope of
the land begins to be less than 12% continually for at least 50 feet.
If the slope of the land is 12% or less continually for the initial
50 feet, landward from the ordinary high-water mark, the top of the
channel is the ordinary high-water mark.
The amount of pollutants specified as a function of one or
more water quality parameters, that can be discharged per day into
a water quality limited segment and still ensure attainment of the
applicable water quality standard.
The Technical Paper No. 40, Rainfall Frequency Atlas of the
United States, published in 1961.
The United States Department of Agriculture Natural Resources
Conservation Service (previously Soil Conservation Service), Urban
Hydrology for Small Watersheds, Second Edition, Technical Release
55, June 1986, which is incorporated by reference for this article.
A public street, a public road, a public highway, a railroad,
a public mass transit facility, a public-use airport, a public trail,
or any other public work for transportation purposes such as harbor
improvements under § 85.095(1)(b), Wis. Stats. "Transportation
facility" does not include building sites for the construction of
public buildings and buildings that are places of employment that
are regulated by the Wisconsin Department of Natural Resources pursuant
to § 281.33, Wis. Stats.
A rainfall-type curve as established in the United States
Department of Agriculture Soil Conservation Service Technical Paper
149, published 1973, which is incorporated by reference for this article.
The Type II curve is applicable to all of Wisconsin and represents
the most intense storm pattern.
Has the meaning given in § 283.01(20), Wis. Stats.
The following methods shall be used in designing and maintaining
the water quality, peak discharge, infiltration, protective area,
fueling/vehicle maintenance, and swale treatment components of stormwater
practices needed to meet the water quality standards of this article:
A.
Technical standards identified, developed or disseminated by the
Wisconsin Department of Natural Resources under Subchapter V of Chapter
NR 151, Wis. Adm. Code.
B.
Technical standards and guidance identified within the Town of Lawrence
Stormwater Reference Guide.[1]
[1]
Editor's Note: The Town of Lawrence Stormwater Reference Guides
for both the Construction Site Erosion Control Ordinance and the Post-Construction
Stormwater Management Ordinance are on file in the Town offices.
C.
Where technical standards have not been identified or developed by
the Wisconsin Department of Natural Resources, other technical standards
may be used, provided that the methods have been approved by the administering
authority.
D.
In this article, the following year and location have been selected
as average annual rainfall(s): Green Bay, 1969 (Mar. 29-Nov. 25).
A.
Responsible party. The responsible party shall develop and implement
a post-construction stormwater management plan that incorporates the
requirements of this section.
B.
Plan. A written stormwater management plan shall be developed and implemented by the responsible party in accordance with § 145-40. The stormwater management plan shall meet all of the applicable requirements contained in this article.
C.
Requirements. The stormwater management plan shall meet the following
minimum requirements to the maximum extent practicable:
(1)
Water quality. BMPs shall be designed, installed and maintained to
control pollutants carried in runoff from the post-construction site.
The design shall be based on the average annual rainfall, as compared
to no runoff management controls.
(a)
For post-construction sites with 20,000 square feet or more
of impervious surface disturbance and post-construction sites with
one acre or more of land disturbance, the following is required:
[1]
Except as provided in § 145-38(1)(a)[2], a pollutant
reduction is required as follows:
|
Total Suspended Solids (TSS) and Total Phosphorus (TP)
Reduction
| ||||||
|---|---|---|---|---|---|---|
|
New Development
|
Redevelopment
|
Routine Maintenance
| ||||
|
Watershed
|
TSS
|
TP
|
TSS
|
TP
|
TSS
|
TP
|
|
Apple Creek
|
80%
|
41%
|
52%
|
41%
|
52%
|
41%
|
|
Ashwaubenon Creek
|
80%
|
41%
|
52%
|
41%
|
52%
|
41%
|
|
Dutchman Creek
|
80%
|
41%
|
52%
|
41%
|
52%
|
41%
|
|
Fox River
|
80%
|
41%
|
72%
|
41%
|
72%
|
41%
|
[2]
A pollutant reduction is not required for routine maintenance
areas that are part of a post-construction site with less than five
acres of disturbance.
(b)
For post-construction sites with less than 20,000 square feet
of impervious surface disturbance, reduce the pollutant load using
BMPs from the Town of Lawrence Stormwater Reference Guide.[1] These sites are not required to satisfy a numeric performance
standard.
[1]
Editor's Note: The Town of Lawrence Stormwater Reference Guides
for both the Construction Site Erosion Control Ordinance and the Post-Construction
Stormwater Management Ordinance are on file in the Town offices.
(c)
Sites with a cumulative addition of 20,000 square feet or greater of impervious surfaces after June 9, 2008, are required to satisfy the performance standards within § 145-38C(1)(a)[1] and [2].
(d)
The amount of pollutant control previously required for the
site shall not be reduced as a result of the proposed development
or disturbance.
(e)
When designing BMPs, runoff draining to the BMP from off-site areas shall be taken into account in determining the treatment efficiency of the practice. Any impact on the BMP efficiency shall be compensated for by increasing the size of the BMP accordingly. The pollutant load reduction provided by the BMP for an off-site area shall not be used to satisfy the required on-site pollutant load reduction, unless otherwise approved by the administering authority in accordance with § 145-38E.
(f)
If the design cannot meet the water quality performance standards
of § 245-38C(1)(a) through (e), the stormwater management
plan shall include a written, site-specific explanation of why the
water quality performance standard cannot be met and why the pollutant
load will be reduced only to the maximum extent practicable. Except
as provided in § 245-38F, the administering authority may
not require any person to exceed the applicable water quality performance
standard to meet the requirements of maximum extent practicable.
(2)
Peak discharge. BMPs shall be designed, installed and maintained
to control peak discharges from the post-construction site.
(a)
For post-construction sites with 20,000 square feet or more
of impervious surface disturbance and post-construction sites with
one acre or more of land disturbance, the following is required:
[1]
The peak post-development discharge rate shall not exceed the
peak predevelopment discharge rate for the one-year, two-year, ten-year,
and one-hundred-year, twenty-four-hour design storms. These peak discharge
requirements apply to new development and redevelopment areas. No
peak discharge control is required for routine maintenance areas,
unless runoff from the routine maintenance area discharges into a
proposed peak flow control facility.
[2]
TR-55 methodology, Atlas 14 precipitation depths, and the MSE4
distribution shall be used for peak discharge calculations, unless
the administering authority approves the TP-40 precipitation depths
and Type II distribution. The meaning of "hydrologic soil group" and
"runoff curve number" are as determined in TR-55. Unless the site
is currently woodland, peak predevelopment discharge rates shall be
determined using the following runoff curve numbers for a "meadow"
vegetative cover:
|
Maximum Predevelopment Runoff Curve Numbers
| |||||
|---|---|---|---|---|---|
|
Vegetative Cover
|
Hydrologic Soil Group
| ||||
|
A
|
B
|
C
|
D
| ||
|
Meadow
|
30
|
58
|
71
|
78
| |
|
Woodland
|
30
|
55
|
70
|
77
| |
(b)
For post-construction sites with less than 20,000 square feet
of impervious surface disturbance, reduce peak post-development discharge
rates using BMPs from the Town of Lawrence Stormwater Reference Guide.[2] These sites are not required to satisfy a numeric performance
standard.
[2]
Editor's Note: The Town of Lawrence Stormwater Reference Guides
for both the Construction Site Erosion Control Ordinance and the Post-Construction
Stormwater Management Ordinance are on file in the Town offices.
(c)
Sites with a cumulative addition of 20,000 square feet or greater of impervious surfaces after June 9, 2008, are required to satisfy the performance standards within § 145-38C(2)(a)[1] and [2].
(d)
The amount of peak discharge control previously required for
the site shall not be reduced as a result of the proposed development
or disturbance.
(e)
When designing BMPs, runoff draining to the BMP from off-site areas shall be taken into account in determining the performance of the practice. Any impact on the BMP performance shall be compensated for by increasing the size of the BMP accordingly. The peak discharge reduction provided by the BMP for an off-site area shall not be used to satisfy the required on-site peak discharge reduction, unless otherwise approved by the administering authority in accordance with § 145-38E.
(f)
An adequate outfall shall be provided for each point of concentrated
discharge from the post-construction site. An adequate outfall consists
of nonerosive discharge velocities and reasonable downstream conveyance.
(g)
Exemptions. The peak discharge performance standards do not
apply to the following:
[1]
A transportation facility where the discharge is directly into
a lake over 5,000 acres or a stream or river segment draining more
than 500 square miles.
[2]
Except as provided under § 145-38C(2)(d) to (f), a highway reconstruction site.
[3]
Except as provided under § 145-38C(2)(d) to (f), a transportation facility that is part of a redevelopment project.
(3)
Infiltration. BMPs shall be designed, installed, and maintained to infiltrate runoff from the post-construction site, except as provided in § 145-38C(3)(h) through (l).
(a)
For post-construction sites with one acre or more of land disturbance,
the following is required:
[1]
Low imperviousness. For development up to 40% connected imperviousness,
such as parks, cemeteries, and low-density residential development,
infiltrate sufficient runoff volume so that the post-development infiltration
volume shall be at least 90% of the predevelopment infiltration volume,
based on an average annual rainfall. However, when designing appropriate
infiltration systems to meet this requirement, no more than 1% of
the post-construction site is required as an effective infiltration
area.
[2]
Moderate imperviousness. For development with more than 40%
and up to 80% connected imperviousness, such as medium- and high-density
residential, multifamily development, industrial and institutional
development, and office parks, infiltrate sufficient runoff volume
so that the post-development infiltration volume shall be at least
75% of the predevelopment infiltration volume, based on an average
annual rainfall. However, when designing appropriate infiltration
systems to meet this requirement, no more than 2% of the post-construction
site is required as an effective infiltration area.
[3]
High imperviousness. For development with more than 80% connected
imperviousness, such as commercial strip malls, shopping centers,
and commercial downtowns, infiltrate sufficient runoff volume so that
the post-development infiltration volume shall be at least 60% of
the predevelopment infiltration volume, based on an average annual
rainfall. However, when designing appropriate infiltration systems
to meet this requirement, no more than 2% of the post-construction
site is required as an effective infiltration area.
(b)
Predevelopment condition shall assume "good hydrologic conditions"
for appropriate land covers as identified in TR-55 or an equivalent
methodology approved by the administering authority. The meaning of
"hydrologic soil group" and "runoff curve number" are as determined
in TR-55. The actual predevelopment vegetative cover and the following
predevelopment runoff curve numbers shall be used:
|
Maximum Predevelopment Runoff Curve Numbers
| |||||
|---|---|---|---|---|---|
|
Hydrologic Soil Group
| |||||
|
Vegetative Cover
|
A
|
B
|
C
|
D
| |
|
Woodland
|
30
|
55
|
70
|
77
| |
|
Grassland
|
39
|
61
|
71
|
78
| |
|
Cropland
|
55
|
69
|
78
|
83
| |
(c)
For post-construction sites with less than one acre of land
disturbance, infiltrate runoff volume using BMPs from the Town of
Lawrence Stormwater Reference Guide.[3] These sites are not required to satisfy a numeric performance
standard.
[3]
Editor's Note: The Town of Lawrence Stormwater Reference Guides
for both the Construction Site Erosion Control Ordinance and the Post-Construction
Stormwater Management Ordinance are on file in the Town offices.
(d)
Sites with a cumulative addition of one acre or more of new
development after June 9, 2008, are required to satisfy the performance
standards within § 245-38C(3)(a) and (b).
(e)
The amount of infiltration previously required for the site
shall not be reduced as a result of the proposed development or disturbance.
(f)
When designing BMPs, runoff draining to the BMP from off-site areas shall be taken into account in determining the performance of the practice. Any impact on the BMP performance shall be compensated for by increasing the size of the BMP accordingly. The runoff volume reduction provided by the BMP for an off-site area shall not be used to satisfy the required on-site runoff volume reduction, unless otherwise approved by the administering authority in accordance with § 145-38E.
(g)
Pretreatment. Before infiltrating runoff, pretreatment shall be required for parking lot runoff and for runoff from road construction in commercial, industrial and institutional areas that will enter an infiltration system. The pretreatment shall be designed to protect the infiltration system from clogging prior to scheduled maintenance and to protect groundwater quality in accordance with § 145-38C(3)(n). Pretreatment options may include, but are not limited to, oil/grease separation, sedimentation, biofiltration, filtration, swales or filter strips.
(h)
Source area prohibitions. Runoff from the following areas may not be infiltrated and may not qualify as contributing to meeting the requirements of § 145-38C(3) unless demonstrated to meet the conditions of § 145-38C(3)(n):
[1]
Areas associated with a Tier 1 industrial facility identified
in § NR 216.21(2)(a), Wis. Adm. Code, including storage,
loading, and parking. Rooftops may be infiltrated with the concurrence
of the administering authority.
[2]
Storage and loading areas of a Tier 2 industrial facility identified
in § NR 216.21(2)(b), Wis. Adm. Code.
[3]
Fueling and vehicle maintenance areas. Rooftops of fueling and
vehicle maintenance areas may be infiltrated with the concurrence
of the administering authority.
(i)
Source area exemptions. Runoff from the following areas may
be credited toward meeting the requirement when infiltrated, but the
decision to infiltrate runoff from these sources is optional:
[1]
Parking areas and access roads less than 5,000 square feet for
commercial development.
[2]
Parking areas and access roads less than 5,000 square feet for industrial development not subject to the prohibitions under § 145-38C(3)(h).
[3]
Except as provided under § 145-38C(3)(e), redevelopment and routine maintenance areas.
[4]
In-fill development areas less than five acres.
[5]
Roads in commercial, industrial and institutional land uses,
and arterial residential roads.
[6]
Except as provided under § 145-38C(3)(e), transportation facility highway reconstruction and new highways.
(j)
Prohibitions. Infiltration practices may not be located in the
following areas:
[1]
Areas within 1,000 feet upgradient or within 100 feet downgradient
of direct conduits to groundwater.
[2]
Areas within 400 feet of a community water system well as specified
in § NR 811.16(4), Wis. Adm. Code, or within the separation
distances listed in § NR 812.08, Wis. Adm. Code, for any
private well or non-community well for runoff infiltrated from commercial,
including multifamily residential, industrial, and institutional land
uses or regional devices for one- and two-family residential development.
[3]
Areas where contaminants of concern, as defined in § NR
720.03(2), Wis. Adm. Code, are present in the soil through which infiltration
will occur.
(k)
Separation distances.
[1]
Infiltration practices shall be located so that the characteristics
of the soil and the separation distance between the bottom of the
infiltration system and the elevation of seasonal high groundwater
or the top of bedrock are in accordance with the following:
|
Separation Distances and Soil Characteristics
| |||
|---|---|---|---|
|
Source Area
|
Separation Distance
|
Soil Characteristics
| |
|
Industrial, commercial, institutional parking lots and roads
|
5 feet or more
|
Filtering layer
| |
|
Residential arterial roads
|
5 feet or more
|
Filtering layer
| |
|
Roofs draining to subsurface infiltration practices
|
1 foot or more
|
Native or engineered soil with particles finer than coarse sand
| |
|
Roofs draining to surface infiltration practices
|
Not applicable
| ||
|
All other impervious source areas
|
3 feet or more
|
Filtering layer
| |
[2]
Notwithstanding § 145-38C(3)(k)[1], applicable requirements for injection wells classified under Ch. NR 815, Wis. Adm. Code, shall be followed.
(l)
Infiltration rate exemptions. Infiltration practices located
in the following areas may be credited toward meeting the requirement
under the following conditions, but the decision to infiltrate under
these conditions is optional:
[1]
Where the infiltration rate of the soil measured at the proposed
bottom of the infiltration system is less than 0.6 inch per hour using
a scientifically credible field test method.
[2]
Where the least permeable soil horizon to five feet below the
proposed bottom of the infiltration system, using the United States
Department of Agriculture method of soils analysis, is one of the
following: sandy clay loam, clay loam, silty clay loam, sandy clay,
silty clay, or clay.
(m)
Alternate uses. Where alternate uses of runoff are employed, such as for toilet flushing, laundry or irrigation or storage on green roofs where an equivalent portion of the runoff is captured permanently by rooftop vegetation, such alternate use shall be given equal credit toward the infiltration volume required by § 145-38C(3).
(n)
Groundwater standards.
[1]
Infiltration systems designed in accordance with this § 145-38C(3) shall, to the extent technically and economically feasible, minimize the level of pollutants infiltrating to groundwater and shall maintain compliance with the preventive action limit at a point of standards application in accordance with Ch. NR 140, Wis. Adm. Code. However, if site-specific information indicates that compliance with a preventive action limit is not achievable, the infiltration BMP may not be installed or shall be modified to prevent infiltration to the maximum extent practicable.
[2]
Notwithstanding § 145-38C(3)(n)[1], the discharge from BMPs shall remain below the enforcement standard at the point of standards application.
(o)
Where the conditions of § 145-38C(3)(h) through (l) limit or restrict the use of infiltration practices, the performance standard of § 145-38C(3) shall be met to the maximum extent practicable.
(4)
Protective areas.
(a)
"Protective area" means an area of land that commences at the top of the channel of lakes, streams and rivers, or at the delineated boundary of wetlands, and that is the greatest of the following widths, as measured horizontally from the top of the channel or delineated wetland boundary to the closest impervious surface. However, in § 145-38C(4), "protective area" does not include any area of land adjacent to any stream enclosed within a pipe or culvert, such that runoff cannot enter the enclosure at this location. For post-construction sites with one acre or more of land disturbance, the following is required:
[1]
For outstanding resource waters and exceptional resource waters:
75 feet.
[2]
For perennial and intermittent streams identified on a United
States geological survey 7.5-minute series topographic map, or a county
soil survey map, whichever is more current: 50 feet.
[3]
For lakes: 50 feet.
[4]
For wetlands not subject to § 145-38C(4)(a)[5] or [6]: 50 feet.
[5]
For highly susceptible wetlands: 75 feet. Highly susceptible
wetlands include the following types: calcareous fens, sedge meadows,
open and coniferous bogs, low prairies, coniferous swamps, lowland
hardwood swamps, and ephemeral ponds.
[6]
For less susceptible wetlands: 10% of the average wetland width,
but no less than 10 feet nor more than 30 feet. Less susceptible wetlands
include degraded wetlands dominated by invasive species such as reed
canary grass; cultivated hydric soils; and any gravel pits or dredged
material or fill material disposal sites that take on the attributes
of a wetland.
[7]
In § 145-38C(4)(a)[4] to [6], determinations of the extent of the protective area adjacent to wetlands shall be made on the basis of the sensitivity and runoff susceptibility of the wetland in accordance with the standards and criteria in § NR 103.03, Wis. Adm. Code.
[8]
Wetlands shall be delineated. Wetland boundary delineations shall be made in accordance with § NR 103.08(1m), Wis. Adm. Code. Section 145-38C(4) does not apply to wetlands that have been completely filled in compliance with all applicable state and federal regulations. The protective area for wetlands that have been partially filled in compliance with all applicable state and federal regulations shall be measured from the wetland boundary delineation after fill has been placed. Where there is a legally authorized wetland fill, the protective area standard need not be met in that location.
[9]
For concentrated flow channels with drainage areas greater than
130 acres: 10 feet.
[10]
Notwithstanding § 145-38C(4)(a)[1] to [9], the greatest protective area width shall apply where rivers, streams, lakes, and wetlands are contiguous.
(b)
Section 145-38C(4) applies to all post-construction sites located within a protective area, except those areas exempted pursuant to § 145-38C(4)(e).
(c)
The following requirements shall be met:
[1]
Impervious surfaces shall be kept out of the protective area
entirely or to the maximum extent practicable. If there is no practical
alternative to locating an impervious surface in the protective area,
the stormwater management plan shall contain a written, site-specific
explanation.
[2]
Where land-disturbing construction activity occurs within a
protective area, adequate sod or self-sustaining vegetative cover
of 70% or greater shall be established and maintained where no impervious
surface is present. The adequate sod or self-sustaining vegetative
cover shall be sufficient to provide for bank stability, maintenance
of fish habitat, and filtering of pollutants from upslope overland
flow areas under sheet flow conditions. Nonvegetative materials, such
as rock riprap, may be employed on the bank as necessary to prevent
erosion, such as on steep slopes or where high-velocity flows occur.
[3]
Best management practices such as filter strips, swales, or
wet detention ponds, that are designed to control pollutants from
nonpoint sources, may be located in the protective area.
(d)
A protective area established or created after June 9, 2008, shall not be eliminated or reduced, except as allowed in § 145-38C(4)(e)[2], [3] or [4].
(e)
Exemptions. The following areas are not required to meet the protective area requirements of § 145-38C(4):
[1]
Redevelopment and routine maintenance areas provided the minimum requirements within § 145-38C(4)(d) are satisfied.
[2]
Structures that cross or access surface waters such as boat
landings, bridges and culverts.
[3]
Structures constructed in accordance with § 59.692(1v),
Wis. Stats.
[4]
Areas of post-construction sites from which the runoff does not enter the surface water, including wetlands, without first being treated by a BMP to meet the requirements of § 145-38C(1) and (2), except to the extent that vegetative ground cover is necessary to maintain bank stability.
(5)
Fueling and vehicle maintenance areas. Fueling and vehicle maintenance
areas shall have BMPs designed, installed and maintained to reduce
petroleum within runoff, so that the runoff that enters waters of
the state contains no visible petroleum sheen, or to the maximum extent
practicable.
(6)
Swale treatment for transportation facilities. This § 145-38C(6) is not applicable to transportation facilities that are part of a larger common plan of development or sale.
(a)
Requirement. Except as provided in § 145-38C(6)(b), transportation facilities that use swales for runoff conveyance and pollutant removal are exempt from the requirements of § 145-38C(1), (2) and (3), if the swales are designed to do all of the following or to the maximum extent practicable:
[1]
Swales shall be vegetated. However, where appropriate, nonvegetative
measures may be employed to prevent erosion or provide for runoff
treatment, such as rock riprap stabilization or check dams.
[2]
Swales shall comply with the Wisconsin Department of Natural
Resources Technical Standard 1005, Vegetated Infiltration Swale, except
as otherwise authorized in writing by the Wisconsin Department of
Natural Resources.
(b)
Other requirements. Notwithstanding § 145-38C(6)(a), the administering authority may, consistent with water quality standards, require that other requirements, in addition to swale treatment, be met on a transportation facility with an average daily traffic rate greater than 2,500 and where the initial surface water of the state that the runoff directly enters is any of the following:
[1]
An outstanding resource water.
[2]
An exceptional resource water.
[3]
Waters listed in Section 303(d) of the Federal Clean Water Act
that are identified as impaired, in whole or in part, due to nonpoint
source impacts.
[4]
Waters where targeted performance standards are developed pursuant
to § NR 151.004, Wis. Adm. Code.
(7)
Exemptions. The following areas are not required to meet the performance standards within § 145-38C:
(a)
Agricultural production areas with less than 100,000 square
feet of impervious surface disturbance.
(b)
Underground utility construction such as water, sewer, gas,
electric, telephone, cable television, and fiber optic lines. This
exemption does not apply to the construction of any aboveground structures
associated with utility construction.
(c)
The following transportation facilities are exempt, provided
the transportation facility is not part of a larger common plan of
development or sale.
[1]
A transportation facility post-construction site with less than 10% connected imperviousness, based on the area of land disturbance, provided the cumulative area of all impervious surfaces is less than one acre. Notwithstanding this exemption, the protective area requirements of § 145-38C(4) still apply.
[2]
Reconditioning or resurfacing of a highway.
[3]
Minor reconstruction of a highway. Notwithstanding this exemption, the protective area requirements of § 145-38C(4) apply to minor reconstruction of a highway.
[4]
Routine maintenance for transportation facilities that have
less than five acres of land disturbance if performed to maintain
the original line and grade, hydraulic capacity or original purpose
of the facility.
[5]
Routine maintenance if performed for stormwater conveyance system
cleaning.
D.
General considerations for on-site and off-site stormwater management
measures. The following considerations shall be observed in managing
runoff:
(1)
Natural topography and land cover features such as natural swales,
natural depressions, native soil infiltrating capacity, and natural
groundwater recharge areas shall be preserved and used, to the extent
possible, to meet the requirements of this section.
(2)
Emergency overland flow for all stormwater facilities shall be provided
to prevent exceeding the safe capacity of downstream drainage facilities
and prevent endangerment of downstream property or public safety.
E.
BMP location and credit.
(1)
General. To comply with § 145-38C performance standards, the BMPs may be located on site or off site as part of a regional stormwater device, practice or system.
(2)
Off-site or regional BMP.
(a)
The amount of credit that the administering authority may give an off-site or regional BMP for purposes of determining compliance with the performance standards of § 145-38C is limited to the treatment capability or performance of the BMP.
(b)
The administering authority may authorize credit for an off-site
or regional BMP, provided all of the following conditions are satisfied:
[1]
The BMP received all applicable permits.
[2]
The BMP shall be installed and operational before the construction
site has undergone final stabilization.
[3]
The BMP shall be designed and adequately sized to provide a level of stormwater control equal to or greater than that which would be afforded by on-site BMPs meeting the § 145-38C performance standards.
[4]
The owner of the BMP has entered into a § 145-41 maintenance agreement with the Town of Lawrence, or another municipal entity, such that the BMP has a legally obligated entity responsible for its long-term operation and maintenance. Legal authority exists if a municipality owns, operates and maintains the BMP.
[5]
The owner of the BMP has provided written authorization which indicates the permit applicant may use the BMP for § 145-38C performance standard compliance.
[6]
Where an off-site or regional BMP option exists such that the
administering authority exempts the applicant from all or part of
the minimum on-site stormwater management requirements, the applicant
shall be required to pay a fee in an amount determined in negotiation
with the administering authority. In determining the fee for post-construction
runoff, the administering authority shall consider an equitable distribution
of the cost for land, engineering design, construction, and maintenance
of the off-site or regional BMP.
(3)
BMP in nonnavigable waters. For purposes of determining compliance with the performance standards of § 145-38C, the administering authority may give credit for BMPs that function to provide treatment for runoff from existing development and post-construction runoff from new development, redevelopment, and routine maintenance areas and that are located within nonnavigable waters.
(4)
BMP in navigable waters.
(a)
New development runoff. Except as allowed under § 145-38E(4)(b), BMPs designed to treat post-construction runoff from new development areas may not be located in navigable waters and, for purposes of determining compliance with the performance standards of § 145-38C, the administering authority may not give credit for such BMPs.
(b)
New development runoff exemption. BMPs to treat post-construction runoff from new development areas may be located within navigable waters and may be creditable by the administering authority under § 145-38C, if all the following are met:
(c)
Existing development and post-construction runoff from redevelopment, routine maintenance, and infill development areas. Except as provided in § 145-38E(4)(d), BMPs designed to treat post-construction runoff for existing development and post-construction runoff from redevelopment, routine maintenance and infill development areas may not be located in navigable waters, and, for purposes of determining compliance with the performance standards of § 145-38C, the administering authority may not give credit for such BMPs.
(d)
Existing development and post-construction runoff from redevelopment, routine maintenance, and infill development areas exemption. BMPs that function to provide treatment of runoff from existing development and post-construction runoff from redevelopment, routine maintenance and infill development areas may be located within navigable waters, and, for purposes of determining compliance with the performance standards of § 145-38C, the administering authority may give credit for such BMPs, if any of the following are met:
(5)
Water quality trading. To comply with § 145-38C(1) performance standards, the administering authority may authorize credit for water quality trading, provided all of the following conditions are satisfied:
(a)
The treatment practices associated with a water quality trade
shall be in place, effective and operational before credit can be
authorized.
(b)
The water quality trade shall comply with applicable trading
ratios established by the Wisconsin Department of Natural Resources
or the Town of Lawrence.
(c)
The water quality trade shall comply with applicable regulations,
standards, and guidance developed by the Wisconsin Department of Natural
Resources or the Town of Lawrence.
(d)
The responsible party shall furnish a copy of executed water
quality trading agreements or other related information deemed necessary
by the administering authority in order to authorize credit.
F.
Targeted performance standards. The administering authority may establish numeric water quality requirements that are more stringent than those set forth in § 145-38C in order to meet targeted performance standards, total maximum daily loads, and/or water quality standards for a specific water body or area. The numeric water quality requirements may be applicable to any permitted site, regardless of the size of land-disturbing construction activity.
G.
Alternate requirements. The administering authority may establish
stormwater management requirements more stringent than those set forth
in this section if the administering authority determines that an
added level of protection is needed to protect sensitive resources.
Also, the administering authority may establish stormwater management
requirements less stringent than those set forth in this section if
the administering authority determines that less protection is needed
to protect sensitive resources and provide reasonable flood protection.
However, the alternative requirements shall not be less stringent
than those requirements promulgated in rules by Wisconsin Department
of Natural Resources under NR 151, Wisconsin Administrative Code.
A.
Permit required. No responsible party may undertake a land-disturbing
construction activity without receiving a post-construction runoff
permit from the administering authority prior to commencing the proposed
activity.
B.
Permit application and fees. Unless specifically excluded by this
article, any responsible party desiring a permit shall submit to the
administering authority a permit application made on a form provided
by the administering authority for that purpose.
(1)
Unless otherwise excepted by this article, a permit application must
be accompanied by a stormwater management plan, a maintenance agreement
and a nonrefundable permit administration fee.
(2)
The stormwater management plan shall be prepared to meet the requirements of §§ 145-38 and 145-40, the maintenance agreement shall be prepared to meet the requirements of § 145-41, the financial guarantee shall meet the requirements of § 145-42, and fees shall be those established by the Town Board as set forth in § 145-43.
C.
Review and approval of permit application. The administering authority
shall review any permit application that is submitted with a stormwater
management plan, maintenance agreement, and the required fee. The
following approval procedure shall be used:
(1)
Within 20 business days of the receipt of a complete permit application, including all items as required by § 145-39B, the administering authority shall inform the applicant whether the application, plan and maintenance agreement are approved or disapproved based on the requirements of this article.
(2)
If the stormwater permit application, plan and maintenance agreement are approved, or if an agreed-upon payment of fees in lieu of stormwater management practices is made pursuant to § 145-38E, the administering authority shall issue the permit.
(3)
If the stormwater permit application, plan or maintenance agreement
is disapproved, the administering authority shall detail, in writing,
the reasons for disapproval.
(4)
The administering authority may request additional information from
the applicant. If additional information is submitted, the administering
authority shall have 20 business days from the date the additional
information is received to inform the applicant that the plan and
maintenance agreement are either approved or disapproved.
(5)
Failure by the administering authority to inform the permit applicant
of a decision within 20 business days of a required submittal shall
be deemed to mean approval of the submittal and the applicant may
proceed as if a permit had been issued.
D.
Permit requirements. All permits issued under this article shall be subject to the following conditions, and holders of permits issued under this article shall be deemed to have accepted these conditions. The administering authority may suspend or revoke a permit for violation of a permit condition, following written notification of the responsible party. An action by the administering authority to suspend or revoke this permit may be appealed in accordance with § 145-45.
(1)
Compliance with this permit does not relieve the responsible party
of the responsibility to comply with other applicable federal, state,
and local laws and regulations.
(2)
The responsible party shall design and install all structural and
nonstructural stormwater management measures in accordance with the
approved stormwater management plan and this permit.
(3)
The responsible party shall notify the administering authority at least 10 business days before commencing any work in conjunction with the stormwater management plan, and within 10 business days upon completion of the stormwater management practices. If required as a special condition under § 145-39E, the responsible party shall make additional notification according to a schedule set forth by the administering authority so that practice installations can be inspected during construction.
(4)
Practice installations required as part of this article shall be
certified "as built" by a licensed professional engineer. Completed
stormwater management practices must pass a final inspection by the
administering authority or its designee to determine if they are in
accordance with the approved stormwater management plan and ordinance.
The administering authority or its designee shall notify the responsible
party, in writing, of any changes required in such practices to bring
them into compliance with the conditions of this permit.
(5)
The responsible party shall notify the administering authority of
any significant modifications it intends to make to an approved stormwater
management plan. The administering authority may require that the
proposed modifications be submitted to it for approval prior to incorporation
into the stormwater management plan and execution by the responsible
party.
(6)
The responsible party shall maintain all stormwater management practices
in accordance with the stormwater management plan until the practices
either become the responsibility of the Town of Lawrence or are transferred
to subsequent private owners as specified in the approved maintenance
agreement.
(7)
The responsible party authorizes the administering authority to perform any work or operations necessary to bring stormwater management measures into conformance with the approved stormwater management plan, and consents to a special assessment or charge against the property as authorized under Subchapter VII of Ch. 66, Wis. Stats., or to charging such costs against the financial guarantee posted under § 145-42.
(8)
If so directed by the administering authority, the responsible party
shall repair, at the responsible party's own expense, all damage to
adjoining municipal facilities and drainageways caused by runoff,
where such damage is caused by activities that are not in compliance
with the approved stormwater management plan.
(9)
The responsible party shall permit property access to the administering
authority or its designee for the purpose of inspecting the property
for compliance with the approved stormwater management plan and this
permit.
(10)
Where site development or redevelopment involves changes in
direction, increases in peak rate and/or total volume of runoff from
a site, the administering authority may require the responsible party
to make appropriate legal arrangements with affected property owners
concerning the prevention of endangerment to property or public safety.
(11)
The responsible party is subject to the enforcement actions and penalties detailed in § 145-44, if the responsible party fails to comply with the terms of this permit.
(12)
The permit applicant shall post the certificate of permit coverage
in a conspicuous location at the construction site.
F.
Permit duration. Permits issued under this section shall be valid from the date of issuance through the date the administering authority notifies the responsible party that all stormwater management practices have passed the final inspection required under § 145-39D(4).
G.
Alternate requirements. The administering authority may prescribe alternative requirements for applicants seeking an exemption to on-site stormwater management performance standards under § 145-38E or for applicants seeking a permit for a post-construction site with less than 20,000 square feet of impervious surface disturbance.
A.
Plan requirements. The stormwater management plan required under §§ 145-38B and 145-39B shall comply with the Town of Lawrence Stormwater Reference Guide[1] and contain, at a minimum, the following information:
(1)
Name, address, and telephone number of the landowner and responsible
parties.
(2)
A legal description of the property proposed to be developed.
(3)
Predevelopment site map with property lines, disturbed limits, and
drainage patterns.
(4)
Post-development site map with property lines, disturbed limits,
and drainage patterns.
(a)
Total area of disturbed impervious surfaces within the site.
(b)
Total area of new impervious surfaces within the site.
(c)
Performance standards applicable to site.
(d)
Proposed best management practices.
(e)
Groundwater, bedrock, and soil limitations.
(f)
Separation distances. Stormwater management practices shall
be adequately separated from wells to prevent contamination of drinking
water.
[1]
Editor's Note: The Town of Lawrence Stormwater Reference Guides
for both the Construction Site Erosion Control Ordinance and the Post-Construction
Stormwater Management Ordinance are on file in the Town offices.
B.
Alternate requirements. The administering authority may prescribe alternative submittal requirements for applicants seeking an exemption to on-site stormwater management performance standards under § 145-38E or for applicants seeking a permit for a post-construction site with less than 20,000 square feet of impervious surface disturbance.
A.
Maintenance agreement required. The maintenance agreement required under § 145-39B for stormwater management practices shall be an agreement between the Town of Lawrence and the responsible party to provide for maintenance of stormwater practices beyond the duration period of this permit. The maintenance agreement shall be filed with the County Register of Deeds as a property deed restriction so that it is binding upon all subsequent owners of the land served by the stormwater management practices.
B.
Agreement provisions. The maintenance agreement shall contain the following information and provisions and shall be consistent with the plan required by § 145-39B:
(1)
Identification of the stormwater facilities and designation of the
drainage area served by the facilities.
(2)
A schedule for regular maintenance of each aspect of the stormwater management system consistent with the stormwater management plan required under § 145-39B.
(3)
Identification of the responsible party, organization or city, county, town or village responsible for long-term maintenance of the stormwater management practices identified in the stormwater management plan required under § 145-39B.
(4)
Requirement that the responsible party, organization, or city, county, town or village shall maintain stormwater management practices in accordance with the schedule included in § 145-41B(2).
(5)
Authorization for the administering authority to access the property
to conduct inspections of stormwater management practices as necessary
to ascertain that the practices are being maintained and operated
in accordance with the agreement.
(6)
A requirement on the administering authority to maintain public records
of the results of the site inspections, to inform the responsible
party responsible for maintenance of the inspection results, and to
specifically indicate any corrective actions required to bring the
stormwater management practice into proper working condition.
(7)
Agreement that the party designated under § 145-41B(3) as responsible for long-term maintenance of the stormwater management practices shall be notified, by the administering authority, of maintenance problems which require correction. The specified corrective actions shall be undertaken within a reasonable time frame as set by the administering authority.
(8)
Authorization of the administering authority to perform the corrected actions identified in the inspection report if the responsible party designated under § 145-41B(3) does not make the required corrections in the specified time period. The administering authority shall enter the amount due on the tax rolls and collect the money as a special charge against the property pursuant to Subchapter VII of Ch. 66, Wis. Stats.
C.
Alternate requirements. The administering authority may prescribe alternative requirements for applicants seeking an exemption to on-site stormwater management performance standards under § 145-38E or for applicants seeking a permit for a post-construction site with less than 20,000 square feet of impervious surface disturbance.
A.
Establishment of the guarantee. The administering authority may require
the submittal of a financial guarantee, the form and type of which
shall be acceptable to the administering authority. The financial
guarantee shall be in an amount determined by the administering authority
to be the estimated cost of construction and the estimated cost of
maintenance of the stormwater management practices during the period
which the designated party in the maintenance agreement has maintenance
responsibility. The financial guarantee shall give the administering
authority the authorization to use the funds to complete the stormwater
management practices if the responsible party defaults or does not
properly implement the approved stormwater management plan, upon written
notice to the responsible party by the administering authority that
the requirements of this article have not been met.
B.
Conditions for release. Conditions for the release of the financial
guarantee are as follows:
(1)
The administering authority shall release the portion of the financial
guarantee established under this section, less any costs incurred
by the administering authority to complete installation of practices,
upon submission of as-built plans by a licensed professional engineer.
The administering authority may make provisions for a partial pro-rata
release of the financial guarantee based on the completion of various
development stages.
(2)
The administering authority shall release the portion of the financial
guarantee established under this section to assure maintenance of
stormwater practices, less any costs incurred by the administering
authority, at such time that the responsibility for practice maintenance
is passed on to another entity via an approved maintenance agreement.
C.
Alternate requirements. The administering authority may prescribe alternative requirements for applicants seeking an exemption to on-site stormwater management performance standards under § 145-38E or for applicants seeking a permit for a post-construction site with less than 20,000 square feet of impervious surface disturbance.
The fees referred to in other sections of this article shall
be established by the Town Board and may from time to time be modified
by resolution. A schedule of the fees established by the Town Board
shall be available for review in the Town Hall.
A.
Any land-disturbing construction activity or post-construction runoff
initiated after the effective date of this article by any person,
firm, association, or corporation subject to the ordinance provisions
shall be deemed a violation unless conducted in accordance with the
requirements of this article.
B.
The administering authority shall notify the responsible party by
certified mail of any noncomplying land-disturbing construction activity
or post-construction runoff. The notice shall describe the nature
of the violation, remedial actions needed, a schedule for remedial
action, and additional enforcement action which may be taken.
C.
Upon receipt of written notification from the administering authority under Subsection B, the responsible party shall correct work that does not comply with the stormwater management plan or other provisions of this permit. The responsible party shall make corrections as necessary to meet the specifications and schedule set forth by the administering authority in the notice.
D.
If the violations to a permit issued pursuant to this article are
likely to result in damage to properties, public facilities, or waters
of the state, the administering authority may enter the land and take
emergency actions necessary to prevent such damage. The costs incurred
by the administering authority plus interest and legal costs shall
be billed to the responsible party.
E.
The administering authority is authorized to post a stop-work order
on all land-disturbing construction activity that is in violation
of this article, or to request the Town Attorney to obtain a cease-and-desist
order in any court with jurisdiction.
F.
The administering authority may revoke a permit issued under this
article for noncompliance with ordinance provisions.
G.
Any permit revocation, stop-work order, or cease-and-desist order
shall remain in effect unless retracted by the administering authority
or by a court with jurisdiction.
H.
The administering authority is authorized to refer any violation
of this article, or of a stop-work order or cease-and-desist order
issued pursuant to this article, to the Town Attorney for the commencement
of further legal proceedings in any court with jurisdiction.
I.
Any person, firm, association, or corporation that does not comply
with the provisions of this article shall be subject to a forfeiture
of not less than $25 nor more than $500 per offense, together with
the costs of prosecution. Each day that the violation exists shall
constitute a separate offense.
J.
Compliance with the provisions of this article may also be enforced
by injunction in any court with jurisdiction. It shall not be necessary
to prosecute for forfeiture or a cease-and-desist order before resorting
to injunctional proceedings.
K.
When the administering authority determines that the holder of a permit issued pursuant to this article has failed to follow practices set forth in the stormwater management plan, or has failed to comply with schedules set forth in said stormwater management plan, the administering authority or a party designated by the administering authority may enter upon the land and perform the work or other operations necessary to bring the condition of said lands into conformance with requirements of the approved plan. The administering authority shall keep a detailed accounting of the costs and expenses of performing this work. These costs and expenses shall be deducted from any financial security posted pursuant to § 145-42 of this article. Where such a security has not been established, or where such a security is insufficient to cover these costs, the costs and expenses shall be entered on the tax roll as a special charge against the property and collected with any other taxes levied thereon.
A.
Board of Appeals. The Board of Appeals, created pursuant to Section
2.021 of the Town of Lawrence ordinances[1] pursuant to § 60.65, Wis. Stats., shall hear
and decide appeals where it is alleged that there is error in any
order, decision or determination made by the administering authority
in administering this article. The Board shall also use the rules,
procedures, duties, and powers authorized by statute in hearing and
deciding appeals. Upon appeal, the Board may authorize variances from
the provisions of this article that are not contrary to the public
interest and where, owing to special conditions, a literal enforcement
of this article will result in unnecessary hardship.
B.
Who may appeal. Appeals to the Board of Appeals may be taken by any
aggrieved person or by an officer, department, board, or bureau of
the Town of Lawrence affected by any decision of the administering
authority.
Nothing in this article creates or imposes, nor shall be construed
to create or impose, any greater obligation or responsibility on the
municipality which has adopted this article than those minimum requirements
specifically required by State of Wisconsin statutes and Department
of Natural Resources regulations.
