Source: https://www.ecode360.com/27046592
Timestamp: 2020-07-07 04:02:44
Document Index: 726926532

Matched Legal Cases: ['§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 467', '§ 429', '§ 467', '§ 467', '§ 429', '§ 467', '§ 467', '§ 467', '§ 66', '§ 467', '§ 429', '§ 66']

Town of Pacific, WI Stormwater Management
§ 467-1 Title; purpose.
§ 467-2 Authority.
§ 467-3 Findings and declaration of policy.
§ 467-4 Applicability.
§ 467-5 Definitions.
§ 467-6 Exempt land-disturbing activities.
§ 467-7 Land-disturbing activities subject to stormwater management.
§ 467-8 Erosion of adjacent land due to uncontrolled runoff.
§ 467-9 Standards and criteria.
§ 467-10 Application and issuance of permits.
§ 467-11 Time for compliance.
§ 467-12 As-built record drawings.
§ 467-13 Administration.
§ 467-14 Violations.
§ 467-15 Appeals or variance requests.
Chapter 467 Stormwater Management
[HISTORY: Adopted by the Town Board of the Town of Pacific 9-18-2012 by Ord. No. 2012-18. Amendments noted where applicable.]
The title of this chapter is "Stormwater Management." The purpose of this chapter is to promote the public health, safety, prosperity and general welfare of the citizens of the Town of Pacific and to conserve the soil, water and related resources; to prevent and control erosion and sedimentation; to prevent and control water pollution; to protect spawning grounds, fish and aquatic life; to control building sites, placement of structures and land uses; to control exceedance of the safe capacity of existing drainage facilities and receiving water bodies; to prevent undue channel erosion; control scouring and transportation of particulates and to prevent conditions that endanger downstream property. This chapter repeals and replaces any previously adopted Town ordinance as to those matters that are provided for in this chapter.
This chapter applies to the use of lands within the political boundaries of the Town.
A hypothetical discrete rainstorm characterized by a Type II SCS twenty-four-hour duration with a return frequency of one, two, 10, 25 or 100 years. Rainfall amounts for return frequencies are defined in the United States Department of Commerce's Technical Paper No. 40 (TP-40), Rainfall Frequency Atlas of the United States.
Means 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 to employ equivalent permanent stabilization measures.
Are structural or vegetative practices (including fencing), or combinations of both, used to control erosion, sediment and water runoff.
Persons who use land, individually or collectively, as owners, operators, lessors, renters, occupiers who are providing a service that requires access or alterations of the land in order to perform the service, or by other arrangement which gives them the responsibility of private or public land use.
The maximum rate of flow of water at a given point in a channel, watercourse or conduit resulting from a predetermined storm or flood.
Includes contaminating or rendering unclean or impure the waters of the state or making the same injurious to public health, harmful for commercial or recreational use, or deleterious to fish, bird, animal or plant life.
The transportation and deposition of sediment that may ultimately degrade water quality by the presence of suspended solid particles, derived from soils by erosion or discharged into surface waters from other sources; or the deposition of waterborne sediments in stream channels, lakes, reservoirs or on floodplains, usually because of a decrease in the velocity of the water.
Stands for "Source Loading and Management Model," as developed by the Department of Engineering Professional Development, University of Wisconsin, Madison. SLAMM is a computer model used to evaluate the benefits of alternative stormwater treatment practices for both runoff quality and quantity in existing and developing areas.
The average period of time in which a storm of a given duration and intensity can be expected to be equaled or exceeded.
Any element in a stormwater drainage system which is made or improved by human activity.
All facilities used for conducting stormwater to, through or from a drainage area to the point of final outlet, including but not limited to any of the following: conduits and appurtenant features, canals, channels, ditches, streams, culverts, streets and pumping stations.
X-YEAR STORMS
Those rainstorms of varying durations and intensities that have a calculated l/x chance of happening each year. On average, the storms are expected to recur one time in a given "x" year time period.
X-YEAR STORM RUNOFFS
The stormwater runoffs from the x-year storms.
For information regarding exemptions from this chapter, please refer to § 429-6 of Chapter 429, Erosion Control, of the Code of the Town of Pacific.
General requirement. Any landowner, land user, and/or responsible party who undertakes, begins, commences or performs land-disturbing activities, or who permits another person to do the same, on land subject to this chapter shall be subject to the provisions of this chapter.
Activities subject to stormwater management. Activities on public or private lands shall be subject to this chapter, if:
The site has 43,560 square feet or more of land-disturbing activity; or
The site is a multifamily, commercial, industrial, recreational or institutional development with total planned impervious area in excess of 4,000 square feet; or
The site is part of a land division with any of the newly divided lots encompassing less than 20 acres; or
In the opinion of the Town Engineer, the runoff from the land-disturbing activity will create a hazard by exceeding the safe capacity of the receiving water body in the area, or will cause undue channel erosion or an undue increase in water pollution by increased scour and transport of particles, or will otherwise endanger the downstream property owners or their property. "Safe capacity" is defined as the rate of flow that can be handled without flooding.
Compliance with this section. The landowner, land user, and/or responsible party shall comply with this section by following the procedure of § 467-10 and receiving from the Town Engineer written approval of the control plan and a permit before commencement of any land-disturbing activities on lands subject to control under this section.
Any landowner, land user, and/or responsible party who permits excessive erosion of his/her land and sedimentation on adjacent land, public streets or bodies of water from land not otherwise subject to this chapter shall be deemed in violation of this chapter and subject to the penalties provided in § 467-14. Erosion is excessive if sedimentation of adjacent land, waterways, lakes and streams occurs or if the public health, safety or general welfare of the citizens of the Town is harmed. This section applies equally to any landowner, land user and/or responsible party who allows erosion of adjacent land due to uncontrolled runoff emanating from his/her land.
Standard for construction site erosion and sediment control for land-disturbing activities. For information regarding standards for construction site erosion and sediment control, refer to § 429-9 of Chapter 429, Erosion Control, of the Code of the Town of Pacific.
Standards for post-construction on-site detention and runoff control. The following methods shall be used in designing the water quality, peak flow shaving and infiltration components of stormwater practices needed to meet the water quality standards of this chapter:
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 Town Engineer.
In this chapter, the following year and location has been selected as average annual rainfall(s): Madison, 1981 (March 12 to December 2).
Protective areas. For information regarding protective areas, please refer to Chapter 429, Erosion Control.
Performance standards - sediment control.
BMPs shall be designed, installed and maintained to control total suspended solids carried in runoff from the post-construction site, as follows:
For all new development, by design, reduce the total suspended solids load by 80%, based on average annual rainfall, as compared to no runoff management control.
For all redevelopment sites, by design, reduce the total suspended solids load by 40%, based on average annual rainfall, as compared to no runoff management control.
Notwithstanding Subsection E(1)(a) and (b), if the design cannot achieve the applicable total suspended solids reduction specified, the stormwater management 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. Pollutant loading models such as SLAMM, P8 or equivalent methodology may be used to evaluate the efficiency of the design in reducing total suspended solids.
Performance standards - peak discharge.
By design, BMPs shall be employed to maintain or reduce the peak runoff discharge rates as compared to predevelopment conditions for the one-, two-, ten-, twenty-five- and one-hundred-year, twenty-four-hour design storms applicable to the post-construction site. Predevelopment conditions shall assume "good hydrologic conditions" for appropriate land covers as identified in TR-55 or an equivalent methodology. The meaning of "hydrologic soil group" and "runoff curve number" are as determined in TR-55. However, when predevelopment land cover is cropland, rather than using TR-55 values for cropland, the runoff curve numbers in Table 1 shall be used.
For post-development conditions, the hydrologic soil group shall be downgraded by one letter to account for soil compaction during construction.
Table 1 - Maximum Predevelopment Runoff Curve Numbers for Cropland Areas
(Pursuant to § NR 151.123, Wis. Adm. Code)
Performance standards - infiltration. BMPs shall be designed, installed and maintained to infiltrate runoff in accordance with the following, except as provided in Subsection G(2)(d) and (e).
Infiltrate 25% of the post-development runoff from the two-year twenty-four-hour design storm with a Type II distribution. 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. However, when designing appropriate infiltration systems to meet this requirement, no more than 1% of the project site is required as an effective infiltration area.
Predevelopment condition shall be the same as in § 467-9F. A model that calculates runoff volume, such as SLAMM, P8, or an equivalent methodology may be used.
Infiltrate 10% of the runoff from the two-year twenty-four-hour design storm with a Type II distribution. 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. However, when designing appropriate infiltration systems to meet this requirement, 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 in accordance with the standards in this chapter. Pretreatment options may include, but are not limited to, oil/grease separation, sedimentation, biofiltration, filtration, swales or filter strips.
To achieve the infiltration requirement for the parking lots or roads, "maximum extent practicable" should not be interpreted to require significant topography changes that create an excessive financial burden.
To minimize potential groundwater impacts, it is desirable to infiltrate the cleanest runoff. To achieve this, a design may propose greater infiltration of runoff from low-pollutant sources such as roofs and less from higher-pollutant-source areas such as parking lots.
The runoff from the following areas is prohibited from infiltrating due to the potential for groundwater contamination:
Storage and loading areas of Tier 2 industrial facilities identified in § NR 216.21(2)(b), Wis. Adm. Code. Runoff from Tier 2 parking and rooftop areas may be infiltrated but may require pretreatment.
Areas with less than three-foot separation distance from the bottom of the infiltration system to the elevation of seasonal high groundwater or the top of bedrock, except this section 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-foot separation distance from the bottom of the infiltration system to the elevation of seasonal high groundwater or the top of bedrock.
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.
The following are not required to meet the requirements of § 467-9G:
Areas where the infiltration rate of the soil is less than 0.6 inches/hour measured at the site.
Where alternate uses of runoff are employed, such as for toilet flushing, laundry or irrigation, such alternate use shall be given equal credit toward the infiltration volume required by this paragraph.
Minimize pollutants.
Infiltration systems designed in accordance with this paragraph 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.
Notwithstanding Subsection G(2)(g)[1], the discharge from BMPs shall remain below the enforcement standard at the point of standard's application.
For additional general principles, refer to § 467-9F of this chapter.
[Amended 1-17-2017 by Ord. No. 2017-5]
Permit required; procedure and fee.
Unless specifically exempted from this chapter, no landowner, land user, and/or responsible party may undertake a land-disturbing activity subject to this chapter without receiving a permit from the Town Engineer prior to commencing the proposed activity. Each landowner, land user, and/or responsible party desiring to undertake a regulated activity subject to this chapter shall submit to the Town Engineer an application for a permit together with the appropriate fee required by this chapter.
This permit can act concurrently with the Town of Pacific erosion control permit or as a separate permit. In the event it is concurrent with an erosion control permit, it shall be entitled as a "stormwater management and erosion control permit."
Reimbursable services agreement required and escrow. Unless specifically exempted by this chapter, at the time of application every applicant shall be required to sign a reimbursable services agreement or predevelopment agreement supplied by the Town. The agreement shall provide that permits may be withdrawn if fees and charges owed to the Town are not timely paid and shall provide that the Town may collect delinquent fees as a special charge under § 66.0627, Wis. Stats., or through any other means provided by law. Once the completed application has been submitted, the Town Engineer shall prepare an estimate of the Town's review and inspection fees relating to that proposed stormwater management project. The applicant shall then be advised of the amount of that estimate and an amount equal to 120% of the estimated review and inspection fees shall then be deposited in an escrow account to be used toward payment of the Town's review fees. If the amount held in that escrow account falls below 25% of that estimate, the Town Engineer may require that the escrow account be replenished to cover the Town Engineer's estimate of the remaining review and inspection fees.
Unless specifically exempted by this chapter, every applicant for a permit under this chapter shall develop and shall submit a written plan, with supporting documentation, to control stormwater runoff which would result from the proposed activity ("control plan"), which shall be reviewed and approved or disapproved by the Town Board or its designee prior to issuance of the permit.
The applicant, when applicable, shall also develop and submit a plan to control erosion and sedimentation as required in Chapter 429, Erosion Control, of the Code of the Town of Pacific.
The landowner, land user, and/or responsible party shall implement the post-construction stormwater management plan as approved by the Town Engineer.
Contents of the stormwater management plan. The control plan shall contain such information which the Town Engineer may reasonably need to determine runoff control. The Town Engineer may require the following, as well as any other information which, in the judgment of the Engineer, is needed to evaluate the control plan:
For information regarding reporting of sediment reduction, please refer to § 467-9E of this chapter.
For information regarding contents of the control plan, please refer to Chapter 429, Erosion Control, of the Code of the Town of Pacific.
Plans and hydraulic computations of all temporary or permanent structural or nonstructural measures or other protective devices to be constructed in connection with, or as part of, the proposed work, showing:
Estimated surface runoff of the area based upon one-, two-, ten-, twenty-five- and one-hundred-year frequency storm events. Peak flows based upon synthetic storm frequency events calculated using Urban Hydrology for Small Watersheds - TR55 shall be required in the event that storm runoff or stream flow data is not available in the area.
Estimated rate of discharge in cubic feet per second at the point or points of discharge from the site location based upon one-, two-, ten-, twenty-five- and one-hundred-year frequency storm events.
The storm event frequency or recurrence interval and discharge rate in cubic feet per second on which the design of plans for the site location is based.
Proposed provisions to carry runoff to the nearest adequate outlet, such as a curbed street, storm drain or natural drainageway.
Design computations and applicable assumptions for all structural measures for water management. Volume and velocity of flow shall be given for all surface water conveyance measures and pipe outfalls. Surface runoff computations shall be submitted to the Town Engineer in accordance with current administrative guidelines as approved by the Town Plan Commission.
Estimate of cost of water management structures and features.
Provisions for maintenance of control facilities, including easements and agreements, to ensure short- as well as long-term stormwater management.
Prior to submitting the application, the applicant is to obtain the information on the permit requirements from the Town and shall discuss the site plan, site conditions and permit requirements with the Town Engineer. The applicant is to submit a completed permit application and any required application fee and control plan to the Town Clerk. One comprehensive electronic copy of the full submittal, in PDF format, is to be submitted, along with four comprehensive copies in printed form, identical in all respects to the electronic copy. The Town Clerk shall forward the control plan to the Town Engineer for review.
The Town Engineer shall review the control plan and provide a report to the Plan Commission. If additional information is required by the Town Engineer in order to evaluate the application, the Town Engineer shall so notify the applicant, who shall promptly submit the required information. Further review and approval or disapproval shall occur as specified in § 429-15 of this chapter, with applicable time limits determined from the date of receipt of the additional information.
The Plan Commission shall then review the application and the report from the Town Engineer and shall forward its recommendation to the Town Board.
If approved by the Town Board, the Town Engineer shall issue a letter permit to the applicant ("permittee"). Upon issuance of this permit, applicant still remains responsible for all other permits required by the Town.
The permittee must provide and install at his or her expense all drainage, runoff control and erosion control improvements required by Town ordinance and the approved control plan and also must bear his or her proportionate share of the total cost of off-site improvements to drainageways based upon the existing developed drainage area or planned development of the drainage area, as determined by the Town Engineer.
The permittee authorizes the Town Engineer to perform any work or operations necessary to bring the condition of the lands into conformity with the approved control plan, or plan as modified by the Town Engineer, and further consents to the Town placing the total of the costs and expenses of such work and operations upon the tax roll as a special tax against the property.
Any person who submits an application for approval of a stormwater management plan or issuance of a permit required by this chapter shall pay a filing fee in the amount established by the Town Board by resolution and, in addition, shall pay the Town's actual cost for engineering work by the Town Engineer incurred by the Town in connection with review of the erosion control plan, including any inspections and as-built surveys required to assure compliance with the plan. The fee shall be paid prior to issuance of the permit if the engineering review fees have been billed by that time. If billed to the Town after issuance of the permit, the fee shall be paid within 30 days of its receipt by the permittee. Failure to pay such fee within 30 days shall be grounds for revocation of the permit and issuance of a stop-work order. The Town may collect the unpaid fees by imposing a special charge upon the next tax roll of the parcel or parcels of real estate proposed to be or actually disturbed pursuant to § 66.0627, Wis. Stats., or through any other means provided by law.
Roadside ditch grades (bottom of ditch, top of bank at ROW, top of bank beyond ROW, toe of slope); if no ditch exists, longitudinal slope shall be provided.
Culverts (inverts on each end; verify size and type).
Pipes (inlet inverts, manhole inverts, manhole rims, outlet inverts; verify size, type and grade).
Stormwater management facilities pursuant to requirements by the Town Engineer.
For information regarding administration, please refer to Chapter 429, Erosion Control, of the Code of the Town of Pacific.
For information regarding violations, please refer to Chapter 429, Erosion Control, of the Code of the Town of Pacific.
Enforcement not stayed. The filing of an appeal or variance does not preclude the Town from commencing or continuing any of the enforcement actions set forth herein or a forfeiture proceeding unless the Town Board specifically agrees to stay such enforcement.