Loading...
HomeMy WebLinkAboutPC Packet 3.25.2025 City of Falcon Heights Planning Commission City Hall 2077 Larpenteur Avenue West WORKSHOP AGENDA Tuesday, March 25, 2025 7:00 p.m. A. CALL TO ORDER: 7:00 p.m. B. ROLL CALL: Mike Tracy ____ Laura Paynter ____ Jacob Brooks ____ Rick Seifert ____ Jim Mogen ____ Jeremy Hallowanger ____ Jake Anderson ____ Staff Liaison – Hannah Lynch ____ Council Liaison – Eric Meyer ____ C. NEW BUSINESS 1. City Code Updates D. INFORMATION AND ANNOUNCEMENTS 1. Staff Liaison Report 2. Council Liaison Report E. ADJOURN Next regular meeting date: April 22, 2025 ITEM FOR DISCUSSION City of Falcon Heights, Minnesota __________________________ Item City Code Updates Description The City Code frequently needs updates as issues are raised and code is enforced by Staff. This is a discussion about topics that could be addressed in code and how the Planning Commission wishes to move forward. Topics Include: • Impervious Surfaces • Public Hearings for Variances • Trailer/Boat Storage • Setback Clarifications • Composting in R-5 • Utility Building Clarification • PUD Expirations • Language Around Garages Budget Impact None. Attachment(s) • Pervious Pavers Handout • Recreational Vehicle and Boat Parking Handout • PUD Handout Action(s) Requested Staff requests the Planning Commission discuss these potential updates to City Code and advise Staff on how to move forward. Meeting Date March 25, 2025 Agenda Item C-1 Attachment See below. Submitted By Hannah Lynch, Community Development Coordinator 6/23/22, 3:14 PM Overview for permeable pavement - Minnesota Stormwater Manual https://stormwater.pca.state.mn.us/index.php?title=Overview_for_permeable_pavement 1/5 Page Content 1 Benefits and limitations 2 Pretreatment considerations 3 Permit applicability 4 Retrofit suitability 5 Cold climate suitability 6 Special receiving waters suitability 7 Water quality 8 Water quantity 9 Related articles Overview for permeable pavement Green Infrastructure: Permeable pavement can be an important tool for retention and detention of stormwater runoff. Permeable pavement may provide additional benefits, including reducing the need for de-icing chemicals, and providing a durable and aesthetically pleasing surface. Permeable pavements (https://stormwater.pca.state.mn.us/index.php?title=Permeable_p avement) allow stormwater runoff to filter through surface voids into an underlying stone reservoir where it is temporarily stored and/or infiltrated (https://stormwater.pca.state.mn.us/i ndex.php?title=Stormwater_infiltration_Best_Management_Practices). The most commonly used permeable pavement surfaces are pervious concrete, porous asphalt, and permeable interlocking concrete pavers (PICP). Permeable pavements have been used for areas with light traffic at commercial and residential sites to replace traditionally impervious surfaces such as low-speed roads, parking lots, driveways, sidewalks, plazas, and patios. While permeable pavements can withstand truck loads, permeable pavement has not been proven in areas exposed to high repetitions of trucks or in high speed areas because its’ structural performance and surface stability have not yet been consistently demonstrated in such applications. While the designs vary, all permeable pavements have a similar structure, consisting of a surface pavement layer, an underlying stone aggregate reservoir layer, optional underdrains, and geotextile over uncompacted soil subgrade. From a hydrologic perspective, permeable pavement is typically designed to manage rainfall landing directly on the permeable pavement surface area. Permeable pavement surface areas may accept runoff contributed by adjacent impervious areas such as driving lanes or rooftops. Runoff from adjacent vegetated areas must be stabilized and not generating sediment as its transport accelerates permeable pavement surface Download pdf (https://storm water.pca.stat e.mn.us/index. php?title=File: Overview_for _permeable_p avement.pdf) 6/23/22, 3:14 PM Overview for permeable pavement - Minnesota Stormwater Manual https://stormwater.pca.state.mn.us/index.php?title=Overview_for_permeable_pavement 2/5 clogging. Additionally, the capacity of the underlying reservoir layer limits the contributing drainage area (https://stormwa ter.pca.state.mn.us/index.php?title=Contributing_drainage _area_to_stormwater_BMPs). Contents 1 Benefits and limitations 2 Pretreatment considerations 3 Permit applicability 4 Retrofit suitability 5 Cold climate suitability 6 Special receiving waters suitability 7 Water quality 8 Water quantity 9 Related articles Benefits and limitations Benefits: Permeable pavements allow conversion and/or design of typical impervious areas (i.e. parking lots) to pervious areas that infiltrate stormwater runoff. When compared to typical impervious areas, properly designed and maintained permeable pavements can reduce the runoff quantity, reduce total suspended solids (TSS) and total phosphorus (TP) loads into receiving water bodies, and reduce runoff temperatures. In addition, permeable pavements can reduce nitrogen, metals and process oils. Permeable pavements are well suited for high density urban areas with limited space ( highly urban and ultra-urban environments) for other BMPs such as wet ponds (https://stormwater.pca.state.mn.us/index.php?title=Stormwater_ponds), swales (https://stormwater.pca.state.mn.us/index.php?title=Dry_swale_(Grass_swale)) or bioretention systems. Limitations: As with all BMP’s, permeable pavement has limitations that need to be considered before design and construction. Limitations are discussed in detail in the permeable pavement design section. Pretreatment considerations Pretreatment (https://stormwater.pca.state.mn.us/index.php?title=Pretreatment) that removes sediment from runoff draining onto permeable pavement from impervious surfaces is desirable since sediment can clog permeable pavements. For that reason, pretreatment areas should emit practically no sediment onto the permeable pavement surface. Locating such areas next to impervious surfaces upslope from the permeable pavement may not be possible on some sites. Permeable pavement itself can be considered a pretreatment device and included in a stormwater treatment train (https://stormwater.pca.state.mn.us/index.php?title=Using_the_treatment_train_appro ach_to_BMP_selection) if underdrains are utilized within the storage reservoir. The underdrains will typically be routed to a bioretention area. Permit applicability Permeable pavements can be utilized to assist in meeting stormwater requirements for volume, total suspended solids, and total phosphorus. The section on credits provides guidance on the implementation of permeable pavements that may be utilized to meet various runoff volume and pollutant runoff reduction goals ( credits (http s://stormwater.pca.state.mn.us/index.php?title=Overview_of_stormwater_credits)). Example of a new retrofit permeable parking lot at the University of Minnesota 6/23/22, 3:14 PM Overview for permeable pavement - Minnesota Stormwater Manual https://stormwater.pca.state.mn.us/index.php?title=Overview_for_permeable_pavement 3/5 Retrofit suitability In most cases, existing impervious surfaces can be replaced with permeable pavements to achieve improved runoff conditions. Retrofit requires the removal of the old pavement and subgrade and the installation of the underlying reservoir layer and the permeable pavement. For the greatest water quality credits, avoid compaction of subgrade soils. If this is not possible, compacted subgrade soils should be removed or loosened to achieve the maximum infiltration rate possible. Cold climate suitability Favorable permeable pavement performance has been documented in cold climates. Air in the aggregate base acts as an insulating layer and the higher latent heat associated with higher soil moisture delays the formation of a frost layer while maintaining permeability and this condition also reduces frost depths when frozen. Winter sanding should be avoided when possible and if used, removed by vacuuming the following spring. Permeable pavements require significantly less use of, or in some cases, no deicing chemicals and sand to maintain a safe walking or driving surface. Other climate considerations include high wind erosion (California 2003) (http://www.casq a.org/). Dramatic reductions in life span of the infiltration properties of the pavement may occur in these areas due to particulate clogging and this may require additional surface vacuum cleaning. Special receiving waters suitability Many of the same design considerations and limitations apply to permeable pavement as to other infiltration practices. Infiltration of runoff from stormwater hotspots (http s://stormwater.pca.state.mn.us/index.php?title=Poten tial_stormwater_hotspots) (e.g., gas stations, chemical storage areas, etc.) should be carefully considered and in many cases avoided. Special consideration also needs to be taken near Wellhead Protection Areas (https://stormwater.pca.stat e.mn.us/index.php?title=Stormwater_and_wellhead_prot ection) and basement foundations. Some designs may require consideration of storms in excess of the infiltration capabilities of the pavement. For these situations the design should ensure the excess runoff does not negatively impact special surface waters (e.g.,trout streams) through the implementation of additional BMPs. Schematic showing the process of infiltration into permeable pavement during and after a rain event. Note how infiltrating water includes precipitation falling directly on the pavement and runoff from the adjacent street directed onto the pavement. Caution should be used when runoff is diverted from impervious surfaces to permeable pavement. 6/23/22, 3:14 PM Overview for permeable pavement - Minnesota Stormwater Manual https://stormwater.pca.state.mn.us/index.php?title=Overview_for_permeable_pavement 4/5 The table below provides guidance regarding the use of permeable pavement practices in areas upstream of special receiving waters. Note that the suitability of a practice depends on whether the practice has an underdrain (i.e. filtration vs. infiltration practice). Infiltration and filtration bmp1 design restrictions for special waters and watersheds. See also Special waters and other sensitive receiving waters. Link to this table BMP Group receiving water A Lakes B Trout Waters C Drinking Water2 D Wetlands E Impaired Waters Infiltration RECOMMENDED RECOMMENDED NOT RECOMMENDED if potential stormwater pollution sources evident RECOMMENDED RECOMMENDED unless target TMDL pollutant is a soluble nutrient or chloride Filtration Some variations NOT RECOMMENDED due to poor phosphorus removal, combined with other treatments RECOMMENDED RECOMMENDED ACCEPTABLE RECOMMENDED for non-nutrient impairments 1Filtration practices include green roofs, bmps with an underdrain, or other practices that do not infiltrate water and rely primarily on filtration for treatment. 2 Applies to groundwater drinking water source areas only; use the lakes category to define BMP design restrictions for surface water drinking supplies Water quality In general, permeable pavement provides removal of TSS and other pollutants through processes similar to other filtration and infiltration BMPs. However, permeable pavements are not suggested for areas that may receive high loading rates of TSS due to their propensity for surface clogging. The expected annual volume and pollutant reductions for designs without an underdrain are a function of the underlying reservoir storage volume. The greater the storage volume, the greater the annual volume and pollutant reductions. For designs with underdrains, reductions are typically lower depending on the drain outflow location that determines the volume of water removed by the underdrains before infiltration. Of the water intercepted and draining through the underdrain, 45 percent (with upper and lower 90 percent confidence bounds of 65 percent and 24 percent, respectively) of the total phosphorus and 74 percent (with upper and lower 90 percent confidence bounds of 93 percent and 33 percent, respectively) of total suspended solids removal can be expected. These event mean averages and ranges are derived from a literature review on research on permeable pavements. The literature includes 19 studies on pollutant reductions and 10 studies on volume reductions. (See the section on credits for more information on pollutant reduction credits and their relationship to the MIDS credit calculator). Water quantity 6/23/22, 3:14 PM Overview for permeable pavement - Minnesota Stormwater Manual https://stormwater.pca.state.mn.us/index.php?title=Overview_for_permeable_pavement 5/5 The primary advantage of permeable pavements is providing volume reduction by reducing runoff from a site and/or providing attenuation from outflows. The volume of water that will be reduced during a given rainfall event will be equivalent to the volume available for storage below the pavement or underdrain (if an underdrain is present). More discussion on this item is available in the section on credits. Related articles Overview for permeable pavement Types of permeable pavement Design criteria for permeable pavement Construction specifications for permeable pavement Assessing the performance of permeable pavement Operation and maintenance of permeable pavement Calculating credits for permeable pavement Case studies for permeable pavement Green Infrastructure benefits of permeable pavement Summary of permit requirements for infiltration Permeable pavement photo gallery Additional considerations for permeable pavement Links for permeable pavement References for permeable pavement Fact sheets for permeable pavement Requirements, recommendations and information for using permeable pavement BMPs in the MIDS calculator Permeable pavement main page (https://stormwater.pca.state.mn.us/index.php?title=Permeable_pavement) Retrieved from "https://stormwater.pca.state.mn.us/index.php? title=Overview_for_permeable_pavement&oldid=57901" Search This page was last edited on 23 June 2022, at 20:12. © 2022 by Minnesota Pollution Control Agency • Powered by MediaWiki BLANK PAGE  Permeable Pavement DESCRIPTION This fact sheet is intended to provide information about permeable pavers and permeable pavement to Mille Lacs County homeowners who may wish to install or retrofit a permeable pavement driveway, sidewalk, or patio on their property. Permeable pavement, also known as porous or pervious pavement, refers to paving that allows stormwater to seep and infiltrate into the ground rather than running off into nearby drains or natural waterways. WHY PERMEABLE PAVEMENT? Permeable pavement is an effective way to reduce the flow of untreated stormwater into surface waters, and allows for increased stormwater infiltration and treatment. The use of permeable pavement has been shown to mimic the breakdown of pollutants that takes place in natural soils. Research has also shown that snow and ice melt faster on permeable pavement than on traditional pavement. RULES AND REGULATIONS The Minnesota Department of Natural Resources (MN DNR) has established guidelines stating that the use of permeable pavement does not sufficiently replace natural soils and vegetation as a pervious surface/ground cover. Therefore, permeable pavement is considered to be an impervious surface for the purposes of calculating the allowable 25% impervious surface limit in shoreland districts. While the use of permeable pavement may not reduce shoreland impervious surface limitations, it offers many benefits as a method of stormwater management. Article 305.17 of the Mille Lacs County Development Ordinance outlines local standards for stormwater management. GUIDELINES FOR PERMEABLE PAVEMENT USE •The slope of the pervious pavement system should not exceed 2%. •There should be a separation of three feet between the bottom of the pervious system and seasonally saturated soils or bedrock. •The system should be designed to infiltrate the first inch of any storm. •The system should be set back from basements, septic systems, steep slopes, and wells. •The system should be designed by a qualified professional, and maintenance instructions should be provided to the homeowner. New Drainage S Permeable Pavement Mille Lacs County Zoning Department,635 2nd Street SE,Milaca,MN 56353 320-983-8325●www.co.mille-lacs.mn.us 1 of 1 April 2022 BLANK PAGE  White Bear Township BLANK PAGE  City of Oakdale BLANK PAGE  BLANK PAGE  City of Maplewood BLANK PAGE  City of Shoreview Rosemont BLANK PAGE  Golden Valley however, once a PUD has been granted and is in effect for a parcel, no building permit shall be issued for that parcel which is not in conformance with the approved PUD plan, the building code, and with all other applicable City Code provisions. (2) Uses. Once a final PUD plan is approved, the uses are limited to those approved by the specific approved PUD ordinance for the site and by the conditions, if any, imposed by the City in the approval process. (3) Maintenance Preservation. All features and aspects of the final PUD plan and related documents, including, but not limited to, buildings, setbacks, open space, preserved areas, landscaping, wetlands, buffers, grading, drainage, streets and parking, hard cover, signs and similar features shall be used, preserved and maintained as required in said PUD plans and documents. (c) Standards and Guidelines. (1) Intent and Purposes. A PUD shall meet and be consistent with the intent and purpose provisions and all other provisions of this section. (2) Findings. Approval of a preliminary or final PUD plan, or a PUD amendment, requires the following findings be made by the City: a. Quality Site Planning. The PUD plan is tailored to the specific characteristics of the site and achieves a higher quality of site planning and design than generally expected under conventional provisions of this chapter. b. Preservation. The PUD plan preserves and protects substantial desirable portions of the site's characteristics, open space and sensitive environmental features including steep slopes, trees, scenic views, creeks, wetlands and open waters. c. Efficient; Effective. The PUD plan includes efficient and effective use (which includes preservation) of the land. d. Consistency. The PUD plan results in development that is compatible with adjacent uses and consistent with the Comprehensive Plan and redevelopment plans and goals. e. General Health. The PUD plan is consistent with preserving and improving the general health, safety and general welfare of the people of the City. f. Meets Requirements. The PUD plan meets the intent and purpose provisions of Subsection (a) of this section and all other provisions of this section. (3) Size. Each residential PUD must have a minimum area of two acres, excluding areas within a public right-of-way, designated wetland, or floodplain overlay district, unless the applicant can demonstrate to the satisfaction of the City Manager or his/her designee the existence of one or more of the following: a. Unusual physical features of the property itself or of the surrounding neighborhood such that development as a PUD will conserve a physical or topographic feature of importance to the neighborhood or community. b. The property is directly adjacent to or across a right-of-way from property which has been developed previously as a PUD and will be perceived as and will function as an extension of that previously approved development. c. The property is located in a transitional area between different land use categories. (4) Frontage. Frontage on a public street shall be at least 100 feet or adequate to serve the development. (5) Setbacks. a. The City may allow some flexibility in setbacks if it benefits all parties and the environment. Requiring greater or allowing lesser setbacks may be based on uses on and off the site, natural amenities and preservation, topography, density, building heights, building materials, landscaping, lighting and other plan features. The rationale and justification for these setbacks shall be described in the narrative. b. Principal building. No principal building shall be closer than its height to the rear or side lot line when such line abuts on a Single-Family Zoning District. c. All buildings. No building shall be located less than 15 feet from the back of the curbline along those roadways which are a part of the internal road system. Some minor deviations may be allowed provided adequate separation is provided through additional landscaping, berming or similar means. (6) Private Service Facilities or Common Areas. In the event certain land areas or structures are proposed within the PUD for shared recreational use or as service facilities, the owner of such land and buildings shall enter into an agreement with the City to assure the continued operation and maintenance to a pre-determined reasonable standard. These common areas may be placed under the ownership of one of the following as determined by the City Council: a. Dedicated to the public where community-wide use is anticipated b. Landlord; or c. Landowners or homeowners association, provided appropriate conditions and protections satisfactory to the City are met, such as formation of the association, mandatory membership, permanent use restrictions, liability insurance, local taxes, maintenance, and assessment provisions. (7) Private Streets. a. Private streets shall not be approved, nor shall public improvements be approved for any private right-of-way, unless a waiver is granted by the City based on the following and other relevant factors: 1. Extension of a public street is not phys ically feasible as determ ined by the City 2. Severe grades make it infeasible according to the City to construct a public street to min imum City standards 3. The City determines that a public road extension would adversely impact natural amenities; or 4. There is no feasible present or future means of extending right-of-way from other directions. b. If the City determines that there is need for a public street extension , this provision shall not apply, and the right-of-way for a public street shall be provided by dedication in the plat. c. If a waiver is granted for the installation of private streets, the following design standards shall apply: 1. The street must have adequate width consistent with the transportation plan and must be located and approx i mately centered w ithin an easement at least four feet wider than the street. 2. The private street shall be designed to minimize impacts upon adjoin i ng parcels. 3. The design and construction standards must result in a functionally sound street in balance with its intended use and setting. 4. The number of lots to share a common private access drive must be reasonable . 5. Covenants which assign driveway installation and future maintenance responsibility in a manner acceptable to the City must be submitted and recorded with the titles or the parcels which are benefited . 6. Common sections of the private street serving three or more dwellings must be built to a seven-ton design, paved to a width of 20 feet, utilize a minimum grade, and have a max i mum grade which does not exceed 10 percent. 7. The private street must be provided with suitable drainage . 8. Covenants concerning maintenance and use shall be filed against all benefiting properties. 9. Street addresses or City-approved street name signs, if required, must be posted at the point where the private street intersects the public right-of-way. (8) Hard Surfaces. Hard surface coverage is expected not to exceed the following standards. Uses Maximum Hard Cover (Percent) Single-family homes 38% Town homes 40% lApartments, condominiums 42% Institutional uses 45% Industrial uses 70% Business-office uses 80% Commercial-retail 90% Mixed uses of housing with retail, office, or business 90% (9) Public Space. Properties within PUDs are subject to the dedication of parks, playgrounds, trails, open spaces, stormwater holding areas, and ponds as outlined in ChaP-ter 109, pertaining to subdivisions, the Comprehensive Plan, redevelopment plans, or other City plans. (10) Mixed-Income Housing. All applications for new PUDs submitted after September 19, 2017, shall be consistent with the City's Mixed-Income Housing Policy. (11) Public Amenities (Affordable Housing Units). Provide affordable housing units beyond the minimum amount required in the City's Mixed-Income Housing Policy (and comply with all other provisions in the Policy). Three options of affordability include: a. An additional 10 percent of units within the development are rented or sold at 30 percent of area median income or less. b. An additional 20 percent of units within the development are rented or sold at 50 percent of area median income or less. c. An additional 30 percent of units within the development are rented or sold at 80 percent of area median income or less. (12) Public Amenities. All applications for new PUDs submitted after December 1, 2015, shall provide at least one amenity or combination of amenities that total at least five points from the public amenity option table below. An applicant may petition for credit for an amenity not included in the public amenity option table that is not otherwise required in the underlying zoning district; however, if the petition is granted, the amenity may only be allotted up to two points. PUD Amenity Options Points Amenity Standards 5 Green roof Installation of an extensive, intensive, or semi-intensive, modular or integrated green roof system that covers a minimum of 50 percent of the total roof area proposed for the development. 5 Affordable housing units Provide affordable housing units beyond the minimum amount required in the City's Mixed-Income Housing Policy (and comply with all other provisions in the Policy). Three options of affordability include: • An additional 10 percent of units within development are rented or sold at 30 percent of Area Median Income or less. • An additional 20 percent of units within development are rented or sold at 50 percent of Area Median Income or less. • An additional 30 percent of units within development are rented or sold at 80 percent of Area Median Income or less. 4 Public open space Contiguous ground level outdoor open space that is provided beyond the amount of open space required in the underlying zoning district requirements . The space shall preserve the natural landscape while providing the opportunity for members of the public to interact with the natural habitat using walkways, benches, or other mechanisms . BLANK PAGE  Maplewood BLANK PAGE  Oakdale