City of Reedsburg, WI Stormwater Management and Erosion Control

Reducing sediment and pollutants in runoff during construction; and

Reducing sediment and pollutants in post-development runoff.

PERMIT APPLICATION

Stormwater management and erosion control permit application;

Written stormwater management plan with accompanying drawings and supporting engineering data;

Written erosion control plan with accompanying drawings and supporting engineering data;

Maintenance agreement; and

Fees.

STORMWATER MANAGEMENT

Reducing the two-, five-, ten-, twenty-five-, fifty- and 100-year, twenty-four-hour storm post-developed peak discharges to predeveloped levels;

Reducing flooding or erosive discharges of runoff; and

Infiltrating stormwater where applicable.

The definition of terms as described in § NR 151.002, Wis. Adm. Code, shall have the same meanings in this chapter.

§ 530-2 Adoption of standards.

The provisions and regulations of Ch. 62, Wis. Stats., and Chs. NR 281, NR 283 and NR 151, Wis. Adm. Code, adopted by the Wisconsin Department of Natural Resources are hereby made a part of this chapter by reference, and shall extend over and govern all of the stormwater management systems installed, maintained, altered or repaired in the City of Reedsburg.

§ 530-3 Inspection and supervision.

The City Engineer and Building Inspector or their designee shall administer, direct and enforce the provisions of this chapter.

§ 530-4 Applicability.

This chapter shall apply to all land disturbing activities greater than one acre and land disturbing activities of less than one acre which are adjacent to the FEMA-designated floodplain or the City's primary north-to-south storm drainageways or adjacent to Babb Creek, and said land disturbing activities will impact stormwater flow to or in said floodplain, drainageway or Babb Creek; provided, however, for the following exemptions and exclusions:

Erosion control exemptions.

Nonpoint discharges from agricultural facilities and practices.

Nonpoint discharges from silviculture activities.

Routine maintenance for project sites of under one acre of land disturbance if performed to maintain the original line and grade, hydraulic capacity or original purpose of the facility.

Stormwater discharge/detention exemptions:

A redevelopment post-construction site with no increase in exposed parking lots or roads.

A post-construction site with less than 10% connected imperviousness based on complete development of the post-construction site, provided the cumulative area of all parking lots and rooftops is less than one acre.

Agricultural facilities and practices.

Silviculture activities.

Underground utility construction such as water, sewer and fiber-optic lines. This exemption does not apply to the construction of any aboveground structures associated with utility construction.

Stormwater infiltration exclusions:

Areas associated with tier-one industrial facilities identified in § NR 216.21(2)(a), Wis. Adm. Code, including storage, loading, rooftop and parking.

Storage and loading areas of tier-two industrial facilities identified in § NR 216.21(2)(b), Wis. Adm. Code. Runoff from tier-two parking and rooftop areas may be infiltrated, but may require pretreatment.

Fueling and vehicle maintenance areas.

Areas within 1,000 feet upgradient or within 100 feet downgradient of karst features.

Areas with less than three feet separation distance from the bottom of the infiltration system to the elevation of seasonal high groundwater or the top of bedrock. This does not prohibit infiltration of roof runoff.

Areas with runoff from industrial, commercial and institutional parking lots and roads and residential arterial roads with less than five feet separation distance from the bottom of the infiltration system to the elevation of seasonal high groundwater or the top of bedrock.

Areas within 400 feet of a community water system well as specified in § NR 811.16(4), Wis. Adm. Code, or within 100 feet of a private well as specified in § NR 812.08(4), Wis. Adm. Code, for runoff infiltrated from commercial, industrial and institutional land uses or regional devices for residential development.

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.

Any area where the soil does not exhibit one of the following soil characteristics between the bottom of the infiltration system and the seasonal high groundwater and top of bedrock: at least a three-foot soil layer with 20% fines or greater; or at least a five-foot soil layer with 10% fines or greater. This does not apply where the soil medium within the infiltration system provides an equivalent level of protection. This does not prohibit infiltration of roof runoff.

Stormwater infiltration exemptions:

Areas where the infiltration rate of the soil is less than 0.6 inches/hour measured at the site.

Parking areas and access roads less than 5,000 square feet for commercial and industrial development.

Redevelopment post-construction sites.

In-fill development areas less than five acres.

Infiltration areas during periods when the soil on the site is frozen.

Roads in commercial, industrial and institutional land uses, and arterial residential roads.

§ 530-5 Permitting procedures, fees and requirements.

Procedures for permit applicants and the City Engineer or Building Inspector:

All land disturbing activities that are governed by this Code shall submit a permit application 10 business days before planned land disturbing activities.

The permit applicant shall be the landowner of the property. The application will require the landowner's signature.

Within 10 business days of the receipt of a complete permit application, the City Engineer shall inform the applicant whether the application is approved or disapproved.

If the permit application is approved, the City Engineer shall issue the permit.

If the permit application is disapproved, the City Engineer shall detail, in writing, the reasons for disapproval.

The City Engineer may request additional information from the applicant. If additional information is submitted, the City Engineer shall have 10 business days from the date the additional information is received to inform the applicant that the permit application is either approved or disapproved.

Failure by the City Engineer to inform the permit applicant of a decision within 15 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.

The applicant shall notify the City Engineer when the project has been completed and final stabilization of the site has occurred. The City Engineer, or other designee, will perform a final inspection within three business days of the notification and submit a written approval or disapproval within five business days of the final inspection.

A denial of a permit may be appealed to the Zoning Board of Appeals.

Fees for permit application:

Fee amount shall be as set forth in the current City Fee Schedule on file in the City's offices.

[Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. II)]

The fee is nonrefundable after approval or disapproval of permit application has been issued.

The fee will be doubled if land disturbing activities occur prior to permit application approval.

The fee for the permit covers the initial submittal and two resubmittals for a project. Additional fees will be required for each resubmittal after the third disapproval.

All permits issued under this chapter shall be subject to the following conditions, and the permit applicant shall be deemed to have accepted these conditions:

The City Engineer may suspend or revoke a permit for violation of a permit condition immediately following written notification to the permittee. An action by the City Engineer to suspend or revoke this permit may be appealed to the Zoning Board of Appeals.

Compliance with this permit does not relieve the responsibility of the permittee to comply with other applicable federal, state, and local laws and regulations.

Installation, inspection, recording, repairs and maintenance of all stormwater management and erosion control measures shall be in accordance with the approved stormwater management and erosion control plan.

The permittee shall notify the City Engineer at least three business days before commencing any work in conjunction with the stormwater management and erosion control plan and within three business days upon completion of the stormwater management practices. If required as a special condition to the permit, the permittee shall make additional notifications in accordance to a schedule established by the City Engineer.

The City Engineer shall be notified of any modifications to an approved stormwater management and erosion control plan. The City Engineer may require that the proposed modifications supporting documentation be submitted for approval prior to installation.

The City Engineer shall perform any work or operations necessary to bring the site into conformance with the approved stormwater management and erosion control plan, and the permittee consents to a special assessment or charge against the property as authorized under Subch. VII of Ch. 66, Wis. Stats., or to charging such costs against the financial guarantee posted under § 530-11.

If so directed by the City Engineer, the permittee shall repair, at the permittee'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 and erosion control plan.

The permittee shall provide property access to the City Engineer for inspecting the property for compliance with the approved stormwater management and erosion control plan.

Where site development or redevelopment involves changes in direction, increases in peak rate and/or total volume of runoff from a site, the City Engineer may require the permittee to make appropriate legal arrangements with affected property owners concerning the prevention of endangerment to property or public safety.

The permittee is subject to the enforcement actions and penalties detailed in § 530-12 if the permittee fails to comply with the terms of this permit.

Permits issued under this subsection may include conditions established by City Engineer in additional to the requirements needed to meet the performance standards.

Permits issued under this section shall be valid from the date of issuance through the date the City Engineer notifies the responsible party that all stormwater management and erosion control practices have passed the final inspection.

§ 530-6 Stormwater management design criteria.

All land disturbing activities governed by this chapter shall model the peak flows using TR-55 methods and infiltration rates using SLAMM, P8 or an equivalent program:

Peak discharge management design.

By design, BMPs shall reduce the two-, five-, ten-, twenty-five-, fifty- and 100-year, twenty-four-hour storm post-developed peak discharges to predeveloped levels.

Predevelopment conditions shall assume good hydrologic conditions for appropriate land covers as identified in TR-55. However, when predevelopment land cover is cropland, the runoff curve numbers in Table 1 shall be used.

Table 1 Maximum Predevelopment Runoff Curve Numbers for Cropland Areas
Hydrologic Soil Group	A	B	C	D
Runoff Curve Number	56	70	79	83

Post-development conditions shall assume good hydrologic conditions for appropriate land covers as identified in TR-55.

The BMP shall be designed to release peak flows at a safe rate for the two-, five-, ten-, twenty-five-, fifty- and 100-year, twenty-four-hour storm events.

Infiltration design.

BMPs shall be designed, installed, and maintained to infiltrate runoff to the maximum extent practicable.

For residential developments, one of the following shall be met:

(a)

Post-development infiltration volume shall be at least 90% of the predevelopment infiltration volume, based on an average annual rainfall. No more than 1% of the project site is required as an effective infiltration area.

(b)

Infiltrate 25% of the post-development runoff from the two-year, twenty-four-hour design storm event. Separate curve numbers for pervious and impervious surfaces shall be used to calculate runoff volumes and not composite curve numbers as defined in TR-55. No more than 1% of the project site is required as an effective infiltration area.

For nonresidential development, including commercial, industrial and institutional development, one of the following shall be met:

Post-development infiltration volume shall be at least 60% of the predevelopment infiltration volume, based on an average annual rainfall. No more than 2% of the project site is required as an effective infiltration area.

Infiltrate 10% of the runoff from the two-year, twenty-four-hour design storm. Separate curve numbers for pervious and impervious surfaces shall be used to calculate runoff volumes, and not composite curve numbers as defined in TR-55. No more than 2% of the project site is required as an effective infiltration area.

Before infiltrating runoff, pretreatment shall be required for parking lot runoff and for runoff from new 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. Pretreatment options may include, but are not limited to, oil/grease separation, sedimentation, biofiltration, filtration, swales or filter strips.

§ 530-7 Stormwater management plan.

All land disturbing activities that are governed by this chapter shall have a stormwater management plan. The stormwater management plan shall contain, at a minimum, the following information:

Name, address, and telephone number for the following:

Landowner.

Developer.

Stormwater management designer.

Contractor responsible for installation of stormwater management practices.

Responsible party for reporting, monitoring, maintaining and repairing stormwater management facilities during construction.

Responsible party for reporting, monitoring, maintaining and repairing stormwater management facilities post-construction.

A legal description of the property to be developed and street address if applicable.

Predevelopment site conditions map(s), including:

A scaled map with North arrow.

A vertical bench mark.

The property boundary, rights-of-way and easements.

Predominant soil types and hydrologic soil groups.

Predeveloped cover type and condition.

Watershed boundaries used in hydrology determinations.

Existing two-foot contour interval or less.

Topography and drainage patterns, including enough of the contiguous properties to show runoff patterns onto, through, and from the site.

Watercourses that may affect or be affected by runoff from the site.

Rivers, ponds, streams, wetlands, channels, ditches, and other watercourses on and immediately adjacent to the site.

(11)

Limits of the 100-year floodplain.

(12)

Location of wells and wellhead protection areas adjacent to the site.

(13)

Limits of land disturbing activities.

(14)

All major assumptions used in developing input parameters shall be clearly stated. The geographic areas used in making the calculations shall be clearly cross-referenced to the required map(s).

Post-development site conditions map(s) including:

A scaled map with North arrow.

A vertical benchmark.

The property boundary, rights-of-way and easements.

Predominant soil types and hydrologic soil groups.

Predeveloped cover type and condition.

Watershed boundaries used in hydrology determinations.

Proposed two-foot contour interval or less.

Topography and drainage patterns, including enough of the contiguous properties to show runoff patterns onto, through and from the site.

Watercourses that may affect or be affected by runoff from the site.

Rivers, ponds, streams, wetlands, channels, ditches, and other watercourses on and immediately adjacent to the site.

(11)

Limits of the 100-year floodplain.

(12)

Location of wells and wellhead protection areas adjacent to the site.

(13)

Limits of land disturbing activities.

(14)

All major assumptions used in developing input parameters shall be clearly stated. The geographic areas used in making the calculations shall be clearly cross-referenced to the required map(s).

Stormwater management map(s), including:

A scaled map with North arrow.

A vertical bench mark.

The proposed property boundary, rights-of-way and easements.

Proposed two-foot contour interval or less.

Topography, including enough of the contiguous properties to show runoff patterns onto, through, and from the site.

Watercourses that may affect or be affected by runoff from the site.

Rivers, ponds, streams, wetlands, channels, ditches, and other watercourses on and immediately adjacent to the site.

Limits of the 100-year floodplain.

Location of wells and wellhead protection areas adjacent to the site.

Limits of land disturbing activities.

(11)

BMP detail information such as location, storage volume, size, bottom elevation, overflow elevation, outlet structure, top of berm elevation and all other information required to determine that the BMP was adequately sized.

Hydrology computations as needed to show compliance with performance standards. The computations shall be made for each discharge point in the development, and the geographic areas used in making the calculations shall be clearly cross-referenced to the required map(s).

Results of investigations of soils and groundwater required for the placement and design of stormwater management measures. Detailed drawings including cross sections and profiles of all permanent stormwater conveyance and treatment practices.

A description and installation schedule for the stormwater management practices needed to meet the performance standards.

A maintenance plan developed for the life of each stormwater management practice as stated in § 530-9D.

Cost estimates for the construction, operation, and maintenance of each stormwater management practice.

Other information requested, in writing, by the City Engineer or City Engineer's designee to determine compliance of the proposed stormwater management measures with the provisions of this chapter.

All site investigations, plans, designs, computations, and drawings shall be certified by a licensed professional engineer to be prepared in accordance with accepted engineering practice and requirements of this chapter.

§ 530-8 Erosion control design criteria.

All land disturbing activities that are governed by this chapter shall be required to reduce erosion during construction and post-construction:

Erosion control during construction. By design, BMPs shall reduce the sediment load in runoff by 80%.

Post-construction erosion and sediment control:

For new development, by design, reduce the total suspended solids load by 80% based on the average annual rainfall, as compared to no runoff management controls.

For redevelopment, by design, reduce the total suspended solids load by 40% based on the average annual rainfall, as compared to no runoff management controls.

For in-fill development under five acres that occurs within 10 years after the effective date of this chapter, by design, reduce the total suspended solids load by 40% based on an average annual rainfall, as compared to no runoff management controls.

For in-fill development that occurs 10 or more years after the effective date of this chapter, by design, reduce the total suspended solids load by 80% based on an average annual rainfall, as compared to no runoff management controls.

Notwithstanding Subsection B(1) to (4), if the design cannot achieve the applicable total suspended solids reduction specified, the erosion control plan shall include a written and site-specific explanation why that level of reduction is not attained and the total suspended solids load shall be reduced to the maximum extent practicable.

Wisconsin Department of Natural Resources has created Conservation Practice Standards which shall be used to design BMPs.

§ 530-9 Erosion control plan requirements.

All land-disturbing activities that are governed by this chapter shall submit a written erosion control plan with accompanying drawings and supporting engineering data which shall contain, at a minimum, the following information:

Name, address, and telephone number for the following:

Landowner.

Developer.

Erosion control designer.

Contractor responsible for installation of erosion control practices.

Responsible party for reporting, monitoring, maintaining and repairing erosion control measures during construction.

Responsible party for reporting, monitoring, maintaining and repairing erosion control measures post-construction.

A legal description of the property to be developed and street address, if applicable.

A description and installation schedule for the erosion control practices needed to meet the performance standards.

A maintenance plan developed for erosion control practice, including the required maintenance activities and maintenance activity schedule.

Cost estimates for the construction, operation, and maintenance of each permanent erosion control structure.

Other information requested, in writing, by the City Engineer to determine compliance of the proposed stormwater management measures with the provisions of this chapter.

§ 530-10 Maintenance agreement.

A maintenance agreement for stormwater management practices shall be between the City and the responsible party to provide for maintenance of stormwater practices beyond the duration period of the 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.

The maintenance agreement shall contain the following information and provisions:

Identification of the stormwater facilities and designation of the drainage area served by the facilities.

A schedule for regular maintenance of each aspect of the stormwater management system consistent with the stormwater management plan.

Identification of the responsible party(parties) for long-term maintenance of the stormwater management practices identified in the stormwater management plan.

Requirement that the responsible party(parties) shall maintain stormwater management practices in accordance with the schedule in Subsection B(2).

Authorization for the City Engineer 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.

A requirement of the City Engineer to maintain public records of the results of the site inspections, to inform the 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.

A requirement that the party designated under Subsection B(3) as responsible for long-term maintenance of the stormwater management practices be notified by the City Engineer of maintenance problems which require correction. The specified corrective actions shall be undertaken within a reasonable time frame as set by the City Engineer.

Authorization of the City Engineer to perform the corrected actions identified in the inspection report if the responsible party designated under Subsection B(3) does not make the required corrections in the specified time period. The City Engineer shall enter the amount due on the tax rolls and collect the money as a special assessment against the property pursuant to Subch. VII of Ch. 66, Wis. Stats.

§ 530-11 Financial guarantee.

The City may require the submittal of a financial guarantee by the landowner, the form and type of which shall be acceptable to the City Engineer. The financial guarantee shall be in an amount determined by the City Engineer 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 City Engineer 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 City Engineer that the requirements of this chapter have not been met.

Conditions for the release of the financial guarantee are as follows:

The City Engineer shall release the portion of the financial guarantee established under this section, less any costs incurred by the City Engineer to complete installation of practices, upon submission of as built plans by a licensed professional engineer. The City Engineer may make provisions for a partial, pro rata release of the financial guarantee based on the completion of various development stages.