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staff report foxwood 1CITY OF CHANHASSEN PC DATE: June 7, 2016 CC DATE: June 27, 2016 REVIEW DEADLINE: September 3, 2016 CASE #: 2016-13 BY: AF, RG, TH, ML, JM, TJ, JS SUMMARY OF REQUEST: The applicant is requesting a Wetland Alteration Permit, Conditional Use Permit for development in the Bluff Creek Overlay District (BCOD), rezoning from Agricultural Estate District (A-2) to Residential Low and Medium Density (RLM), and a 46- lot subdivision with variances (Foxwood). LOCATION: 9150 and 9250 Great Plains Boulevard APPLICANT: Providence 55, LLC. Jim Wilson & Paul Paulson 1000 Boone Ave. N., Suite 400 9150 and 9250 Great Plains Blvd. Golden Valley, MN 55427 Chanhassen, MN 55317 (763) 432-4500 billcoffman@cbburnet.com PRESENT ZONING: Rural Residential District (RR) 2020 LAND USE PLAN: Residential Low Density (1.2 – 4.0 units/net acre) ACREAGE: 43.55 acres DENSITY: 1.05 units per acre gross, 2.55 units per acre net LEVEL OF CITY DISCRETION IN DECISION-MAKING: The City has a relatively high level of discretion in approving rezonings because the City is acting in its legislative or policy-making capacity. A rezoning must be consistent with the City’s Comprehensive Plan. The City’s discretion in approving or denying a preliminary plat is limited to whether or not the proposed plat meets the standards outlined in the Subdivision Regulations and Zoning Ordinance. If it meets these standards, the City must approve the preliminary plat. This is a quasi-judicial decision. PROPOSED MOTION: “The Chanhassen Planning Commission recommends that City Council approve a Conditional Use Permit for development in the Bluff Creek Overlay District (BCOD), rezoning from Agricultural Estate District (A-2) to Residential Low and Medium Density (RLM), and a 46 lot, six outlots and public right-of-way preliminary plat with variance for the use of a private street and a 20 foot setback variance from the Bluff Creek Primary zone subject to the conditions of approval, table the Wetland Alteration Permit and adopt the Findings of Fact and Recommendation.” Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 2 of 24 The city’s discretion in approving or denying a variance is limited to whether or not the proposed project meets the standards in the Subdivision Ordinances for variances. The City has a relatively high level of discretion with a variance because the applicant is seeking a deviation from established standards. This is a quasi-judicial decision. The city has limited discretion in approving or denying Conditional Use Permits, based on whether or not the proposal meets the conditional use permit standards outlined in the Zoning Ordinance. If the city finds that all the applicable conditional use permit standards are met, the permit must be approved. This is a quasi-judicial decision. The city’s discretion in approving or denying a Wetland Alteration Permit is limited to whether or not the proposal meets the standards outlined in the Zoning Ordinance. If it meets these standards, the city must approve the wetland alteration permit. This is a quasi-judicial decision. Notice of this public hearing has been mailed to all property owners within 500 feet. PROPOSAL/SUMMARY The applicant is requesting a rezoning of the property from Agricultural Estate District, A-2, to Low and Medium Density Residential, RLM, to permit the subdivision of the property into 46 single-family lots, six outlots and public street right-of-way. The applicant is proposing to subdivide two parcels with a total of 43.55 acres into 43 building lots and six outlots. In conjunction with the plat, the applicant is requesting a variance to permit the use of a private street and to have a uniform 20-foot setback from the designated Bluff Creek Primary zone boundary. This private street will provide access to the two homes currently on the property, one of which is not included in the subdivision. The area is the first area of the area southeast of Highway 212 in the 2010 Metropolitan Urban Services Area to come in for single- family residential development with urban services. The new, primary public road is a temporary cul-de-sac until development of the property to the south at which time, street connections will go out to Powers Boulevard. Water main and sanitary sewer would be extended to provide for future development. The applicant is also requesting a Conditional Use Permit for development within the Bluff Creek Overlay District. Prior to any development the city must review a conditional use permit for the project. APPLICABLE REGULATIONS Chapter 18, Subdivisions Chapter 20, Article II, Division 2, Amendments Chapter 20, Article IV, Conditional Uses Chapter 20, Article VI, Wetland Protection Chapter 20, Article XIV, Division 1, “RLM” Low and Medium Density Residential District Chapter 20, Article XXXI, Bluff Creek Overlay District Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 3 of 24 BACKGROUND The structure on the Wilson property was originally constructed in 1900. A wholesale nursery has operated on this property since The house on the southern property was built in 1986. SITE CONSTRAINTS Wetland Protection The City of Chanhassen Wetland Inventory indicates the presence of four wetlands on or immediately adjacent to the subject property. Kjolhaug Environmental Services Company performed a field review and delineation on October 2, 2015. At that time, 5 individual wetland basins were identified. Due to seasonal constraints, staff felt that the area between wetland 4 and wetland 3 should be revisited in the spring during the growing season. On May 10, 2016 the Technical Evaluation Panel (TEP) was convened and met on-site to review the area in question as well as three recently delineated basins on the Paulson property to the east. At this TEP it was determined that wetland 3 and wetland 4 were connected. The consultant is in the process of updating the delineation report so that it can be reviewed and approved or will need to be further modified. This connection means that the impact for the road will be larger than originally thought. As of today, May 27, 2016, there is no approved wetland delineation. In the absence of an approved boundary, the total impact area is indeterminate. As such, no wetland alteration permit may be considered for approval at this time. It is the City’s practice to have wetlands and buffers placed into outlots to implement the no net loss goal. The city requires that all runoff is treated prior to discharge into a wetland. Treatment practices are being proposed for much of the drainage being directed to the wetlands. The only exception are the backyards of Block 2. This area will have a wide buffer to provide treatment and only consists of 3 backyards. For this reason, the runoff should not have a deleterious impact on the wetland water quality. The wetlands on the property are classified as either management classification 1; wetlands 1p, 2p and 3p as well as wetland 1 and wetland 2; or management classification 2. Manage 1 wetlands require a minimum buffer width of 25 feet and manage 2 wetlands require a minimum buffer width of 20 feet. Both require a 30-foot setback from the buffer edge to the primary structure. The primary zone should be, at a minimum, incidental with the wetland buffer edge for those areas tributary to Bluff Creek. These buffers must be managed with native vegetation. If they are not disturbed, the existing vegetation will be adequate. Any buffer that is disturbed must have a planting schedule and vegetation management plan. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 4 of 24 Any impacts on the site will be subject to the following conditions. 1. The applicant must demonstrate that they have met the sequencing requirements of Minnesota Rules Chapter 8420.0520. They must first seek avoidance of wetland impacts. If this is not possible then they must mitigate the impacts to the greatest practicable extent. 2. The applicant must provide the updated wetland boundary, supporting documentation and a georeferenced shapefile for approval by the LGU. 3. The applicant must get approvals from all other agencies with jurisdiction over wetlands on the site. This may include, although not be limited too, the United States Army Corps of Engineers and the Minnesota Department of Natural Resources. 4. The applicant must identify a suitable replacement plan for any unavoidable impacts and submit to the City and other appropriate agencies for approval. 5. Signage will be required at every lot corner and angle point along the private lots adjacent to the wetlands not bound by the BCOD. The city has wetland buffer signs available and the signs shall be at the developer’s expense. Bluff Protection There are no bluffs on the property. There are some areas of steeper slopes. Care should be taken when grading in or near these areas. Shoreland Management The property lies beyond the shoreland overlay district for Lake Riley. As such it will not be subject to shoreland requirements for land development. Floodplain Overlay This property does not lie with a floodplain. BLUFF CREEK OVERLAY DISTRICT A significant portion of the site lies within the Bluff Creek Overlay District (BCOD). This is intended to protect the characteristics of Bluff Creek from development pressures. The requirements of the Bluff Creek Overlay District are stated in Article XXXI of Chapter 20 of City Code. City staff and the consulting engineer for the applicant have worked together to identify the limits of the Bluff Creek Overlay District. At a minimum the BCOD should include the wetlands and wetland buffer area around wetlands 1 and 2. Any disturbance within the BCOD must be re-established with native vegetation and have a planting schedule and vegetation management plan. The following conditions apply to the Bluff Creek Overlay District. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 5 of 24 1. Infiltration basin IB1 located north of Lots 10, 11, 16 and 17 of block 1 shall be evaluated for methods to reduce tree loss. The designer shall work with City staff to meet this end. 2. The Bluff Creek Overlay District Boundaries shall be shown to be incidental with the boundary of Outlot A. 3. Any grading within the Bluff Creek Overlay District must be restored with native vegetation. A planting schedule and vegetation maintenance plan of at least 3 years shall be provided to the city for review and approval. 4. Signage will be required at every lot corner and angle point along the private lots adjacent to the BCOD. The sign language shall be provided by the city and the signs shall be at the developer’s expense. These signs shall be placed by the developer prior to selling any of the lots. REZONING The existing zoning of the property, Agricultural Estate District, is not consistent with the land use designation of the property, Residential Low Density. The comprehensive plan allows less intensive land uses to remain in place. However, any approval by the city for development of the property must be consistent with the comprehensive plan. The following zoning districts would be consistent with a Residential Low Density land use: Single-Family Residential, RSF, Mixed Low Density Residential, R-4, Low and Medium Density Residential, RLM, and Planned Unit Development – Residential, PUD-R. Staff and the applicant initially looked at proceeding under the typical RSF zoning regulations. However, the topography of the site and the natural features including woods and wetlands made it difficult and inefficient to meet all the standards. Similarly, the R-4 District had the same limitations and constraints as the RSF District. The use of a PUD-R zoning did not seem appropriate due to the fact we were not proposing flexible standards to accommodate unique housing styles or affordable housing. Furthermore, the applicant and city were interested in finding opportunities for the preservation of many natural features on the property. The RLM district is the most appropriate zoning district to rezone this property since the developer is preserving significant upland areas as well as wetlands within the outlots for common open space. The RLM district permits single-family homes, as well as twin homes, townhouses and attached housing. This RLM subdivision will be limited to single-family homes. The RLM district requires that large areas of upland are preserved or created as permanent open space to balance the higher hard surface coverage permitted on the individual lots. Staff is recommending the rezoning to RLM be approved. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 6 of 24 CONDITIONAL USE PERMIT The City of Chanhassen established the Bluff Creek Overlay District, BCO, by ordinance in 1998 to protect the Bluff Creek Corridor, wetlands, bluffs and significant stands of mature trees through the use of careful site design and other low-impact practices. This parcel is partially encumbered by the Bluff Creek Overlay District. A conditional use permit shall be issued by the city for all subdivisions, site plans, and prior the erection or alteration of any building or land within the BCO. Outlots A and C contain the Bluff Creek Corridor primary zone. The Primary Corridor is designated open space. All structures must meet a 40-foot structural setback from the Primary Corridor boundary as required by Chanhassen City Code. However, since the city is designating the Primary Corridor Boundary as incidental to outlot A, which is more convenience then actual boundary, we recommend a blanket 20-foot setback, requiring a 20-foot variance. The developer may dedicate Outlot A and C to the city. 1. Infiltration basin IB1 located north of Lots 10, 11, 16 and 17 of block 1 shall be evaluated for methods to reduce tree loss. 2. The Bluff Creek Overlay District Boundaries shall be shown to be incidental with the boundaries of Outlots A and C. 3. Any grading within the Bluff Creek Overlay District must be restored with native vegetation. A planting schedule and vegetation maintenance plan of at least 3 years shall be provided to the city for review and approval. 4. Signage will be required at every lot corner and angle point along the private lots adjacent to the BCOD. The sign language shall be provided by the city and the signs shall be at the developer’s expense. These signs shall be placed by the developer prior to selling any of the lots. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 7 of 24 SUBDIVISION The applicant is proposing a 43 lot single-family detached housing subdivision served via public streets. EASEMENTS Existing Conditions Survey The survey shows a 16.5-foot-wide telephone easement through the center of the site. This easement must be vacated before the City Council considers final plat approval. GRADING The applicant proposes to mass grade the site. The site contains three wetlands- Wetlands 1p, 2p, and Wetland 2- where the wetlands are higher than the adjacent homes. Wetland 3p is part of the Wetland 1p/2p complex and is approximately the same elevation of one of the proposed adjacent homes. The existing drainage area to the Wetlands 1p, 2p and 3p is relatively small. Based on staff experience a portion of the hydrology to this wetland complex may be via groundwater. Section 18-40 (4) d. 2. i. requires a three-foot separation between the water elevation and the adjacent low floor elevation. The building pad for Lot 4, Block 5 is 50’ from Wetland 3p and the low floor elevation is approximately 7 feet below the wetland elevation. Similarly, Lot 18, Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 8 of 24 Block 1 is approximately 60’ from Wetland 2, and the lowest floor elevation is 5.5’ lower than the wetland. Soil borings were not taken in the area of the Wetland 1p/2p/3p complex or Wetland 2 therefore staff recommends that the developer install shallow monitoring wells or piezometers. Water elevations shall be monitored for a minimum of four weeks during a time when seasonally high water table would be expected. This information will be considered in determining the appropriate elevations of the adjacent homes and/or infrastructure necessary to meet City Code. An oversized drainage and utility easement is required at the back of Lot 1, Block 6 as this area conveys drainage from the adjacent parcel. Staff recommends that the 916’ contour extend into the drainageway to create a swale versus the sheet drainage pattern that is currently shown; it has been staff’s experience that landscaping/hardscaping/etc. on the downstream parcel tends to impede sheet drainage. Per Section 18-40 (4) d. 2. v. a drain tile service is required for Lots 1-4 Block 5, Lot 6 Block 5; and Lots 1-3 Block 6 as these lots are proposed to drain from the back of the lot towards the street. There are several locations throughout the site where the driveway grades exceed 9%. The developer’s engineer shall ensure that the maximum driveway grades shown on the plan are calculated such that a 10’ landing is provided where the driveway connects to the street and a five to 10-foot landing is provided at the garage. The recommended grade at these locations is 3%. On the grading plan label the existing contours. DRAINAGE Under existing conditions, the site is divided into three major drainage areas. The northern approximately 17 acres of upland and about 8.5 acres of wetland drains to the large DNR Public Water Wetland located north and west on this and adjoining properties. This wetland ultimately drains to Bluff Creek which is listed as impaired for turbidity and fish indices of biologic integrity. A Total Maximum Daily Load (TMDL) implementation plan was finished in 2013. This study revealed that low base flows and flashiness after larger rain events are the largest contributors to the impairments. This makes achieving volume reduction more imperative than it might otherwise be. The middle 12 or so acres of upland drains to wetland 3 in the southeast of the property. This heavily wooded portion drains to the east and ultimately to Lake Riley. The remaining portion either drains directly to the right-of-way for T.H. 101 or to the most southerly wetland, wetland 4. In either case Lake Riley is the receiving water body and at 0.3 miles is well within the 1-mile radius pertinent to the NPDES permit. Lake Riley is impaired for nutrients. Riley Creek, downstream of Lake Riley is also on the 303D list as having a turbidity impairment. This is just over 1 mile from the site but the site is within the contributing Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 9 of 24 watershed and the development of this site should be considered in regard to the forthcoming waste load allocation that will be given to the city. The Stormwater Management Hydrologic and Hydraulic Study (H&H Study), dated May 6th 2016 was reviewed. There are several assumptions and practices employed in this model that staff does not feel are accurate or meet the intent of code. The first is the assumption that the entire site has soils that fall into the hydrologic class of a “D” soil despite the USGS Web Soil Survey indicating that the majority of the soils on the site are in the “B” hydrologic group. The H&H Study assumes that the soils will have the same hydrologic properties after full build out. This is contrary to known construction practices and resulting increases in bulk density. The typical methodology of site preparation involves extensive clearing and grading with large proportions of the development experiencing cuts or fills. High soil densities are desired as this minimizes settling which can lead to cracking of foundations and paved surfaces. However, the compaction is typically not confined to these areas as the entire site is prepared en mass. There have been several studies, such as the 2001 study conducted by Ocean County Soil Conservation District, that show that the accepted NRCS Technical Release 55, (TR-55) Urban Hydrology for Small Watersheds curve numbers underestimate infiltration rates in wooded areas and overestimated infiltration rates in disturbed soils with high bulk densities. When bulk densities increase above 1.65 g/cm3, infiltration rates slow and approach zero. The MN Stormwater Manual references two studies indicating that bulk densities on mass graded sites increase 0.34 to 0.35 g/cm3 over undisturbed conditions. The MN Stormwater Manual also indicates that “urban fill soils” have a bulk density between 1.5 g/cm3 and 1.9 g/cm3. For all these reasons staff feels it is not accurate to assume that post construction soils will have the same hydraulic characteristics as the current undisturbed soils as the H&H Study does. The model shall be modified to reflect the fact that current soil conditions and vegetative cover will have a lower bulk density and a higher infiltration rate than fully developed conditions. In reviewing the model, staff noted several instances where the time of concentration increased post development. Given the installation of pavement, curb and gutter and storm sewer pipe with the specific purpose of quickly collecting stormwater and conveying it to a receiving body, this is counter to what would be expected. In some cases, such as drainage area D-W4 the vegetative cover remains unchanged but the distance the runoff needs to travel decreased yet the time of concentration increased from 1.7 minutes to 10 minutes. Drainage area D-W3 goes from an 11 acres wooded tract of land that spans the entire site from west to east to a 4-acre area that includes 8 additional backyards and approximately ¼ the travel distance for runoff. However, the time of concentration increased from 6.2 minutes to 10 minutes. The model must be modified to accurately reflect times of concentration for each drainage area. As noted earlier, the soil survey for this area indicates that the area is predominately “B” soils. Exceptions include the depressional areas where wetlands are located. However, the model assumes “D” soils throughout yet indicates that they will get 0.45”/hour at infiltration basin #1 Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 10 of 24 and 0.20”/hour at infiltration basin #2. These rates are consistent with “B” and “C” soils respectively. There is a distinct incongruence between these assumptions. It has been staffs experience that geotechnical borings lack the temporal and spatial resolution necessary to ignore soil survey data. In the absence of measured infiltration rates, the site should be modeled with conditions similar to what is anticipated given the soil survey and the proposed construction methodologies. City code requires that rates are not increased at any point where runoff leaves the site. By definition, entering a water of the state, is considered leaving the site. The wetlands cannot be used to meet rate control. Rate control must be achieved prior to discharge to any of the wetlands, MN DOT right-of-way or adjoining properties. The aforementioned time of concentrations shall also be modified accordingly in determining rates. EROSION PREVENTION AND SEDIMENT CONTROL The proposed development will exceed one (1) acre of disturbance and will, therefore, be subject to the General Permit Authorization to Discharge Stormwater Associated with Construction Activity Under the National Pollution Discharge Elimination/State Disposal System (NPDES Construction Permit). The applicant has prepared and submitted a Surface Water Pollution Prevention Plan (SWPPP) to the city for review. The SWPPP is a required submittal element for preliminary plat review. No earth disturbing activities may occur until an approved SWPPP is developed. This SWPPP shall be a standalone document consistent with the NPDES Construction Permit and shall contain all required elements as listed in Parts III and IV of the permit. The SWPPP will need to be updated as the plans are finalized, when the contractor and their sub-contractors are identified and as other conditions change. Changes to the erosion prevention and sediment control plan that should be made prior to final plat are as follows: 1. The infiltration basin areas shall be protected from construction traffic and other construction related activities throughout the duration of the project. This shall be noted on the grading plan, in the SWPPP and shown with pre-construction silt fence location. 2. The infiltration areas shall be graded last. The tributary area shall be graded and stabilized prior to excavation of the infiltration basins. 3. The mass grade phasing schedule shall include stripping and stockpiling of top soil material. 4. The grading and erosion plan shall include stockpile locations. 5. The SWPPP and erosion plan shall include topsoil quantities necessary to place six inches (6”) on all disturbed areas to be re-vegetated. 6. A detailed planting schedule and plan shall be included for each infiltration basin. 7. Redundant perimeter controls are required for all disturbs soils draining to wetlands. This may be silt fence, biologs, wind-rows of salvaged and stockpiled topsoil or other as approved by the city. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 11 of 24 8. The developer shall be responsible for procuring the NPDES construction permit and providing proof to the city prior to any land disturbing activities. RETAINING WALLS The plans identify 10 retaining walls that are proposed to be constructed with the project. Location Maximu m Height Length Comments Lot 1, Block 1 3’ 52’ Lot 2, Block 1 3’ 70’ Lot 6, Block 1 Side yard 3’ 85’ Lot 6, Block 1 Back yard 8’ 107’ Lot 17, Block 1 5’ 90’ Lot 5, Block 2 6’ 50’ Lot 2, Block 4 8’ 100’ Must be moved out of the drainage and utility easement. Lot 7, Block 5 4’ 40’ Lot 10, Block 5 6’ 60’ Lot 11, Block 5 4’ 55’ STREETS The development will construct a minor collector road, Road A from TH 101 to the project limits. This street will ultimately extend to Powers Boulevard when the property to the south develops. A temporary cul-de-sac will be installed at the end of Road A. The grading plan must be revised to eliminate the 3H:1V slope within the temporary cul-de-sac. The developer shall dedicate an easement over the temporary cul-de-sac; the easement exhibit shall be submitted with the final plat application. The streets shown in the preliminary plat are 31’ wide within a 60-foot wide right of way; cul-de-sacs are shown at 90’ diameter within a 120’ right of way. The developer will install a private street to the two existing homes at 9250 Great Plains Blvd (Lot 5, Block 5) and 9350 Great Plains Blvd. The private street will extend from Road A within Outlot B and must be built to a 7-ton design. Pedestrian curb ramps from the sidewalks to the street are required must be ADA-compliant. Based on the road profiles submitted the developer should ensure that the ramps at the intersections of Road A/D and Road D/E will meet ADA requirements; issues have been encountered in other developments where it is difficult to construct ADA-compliant curb ramps when the street grade at an intersection exceeds the maximum grade allowed by ADA. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 12 of 24 SANITARY SEWER AND WATERMAIN The well on the property must be properly abandoned. This site lies within the service area of a future, permanent lift station that will be located on Powers Boulevard between Highway 212 and Pioneer Trail as shown on the map below. The City will not reimburse for the cost of the temporary lift station and force main that will service Foxwood as the developer has elected to proceed with developing the site prior to installation of the City’s trunk lift station and force main. The cost of the trunk lift station and force main will be assessed to the properties that will be serviced by the system. Staff is mapping the service area to determine net benefitting area. At a future council meeting a feasibility report will be presented and will recommend an area sewer fee for these utilities. The Foxwood development would be subject to this fee, which would be paid with the final plat. The temporary lift station will be installed at the southern end of Road A and must be located outside of the temporary cul-de-sac. The temporary force main will connect to the existing gravity sanitary sewer on the south side of Lyman Boulevard at Crossroads Boulevard. These temporary utilities will remain until the property to the south develops and extends gravity sanitary sewer to the site. The developer must work with staff to ensure that the invert elevation is at or higher than the invert elevation established during the concept planning of the undeveloped parcel to the south. Subject property Future force main Future permanent lift station POWERS BLVD Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 13 of 24 The developer proposes to extend eight-inch C-900 water main from the 12” trunk main within TH 101. The water main will be stubbed at the temporary cul-de-sac and will be looped to 16” trunk main within Powers Boulevard when the property to the south develops. On Sheet 18 modify Note 2 to state that 10’ horizontal separation is required between water and sewer lines and modify Note 11 to state that sanitary sewer services shall be 6” diameter. STORM WATER MANAGEMENT Article VII, Chapter 19 of city code describes the required storm water management development standards. Section 19-141 states that “these development standards shall be reflected in plans prepared by developers and/or project proposers in the design and layout of site plans, subdivisions and water management features.” Storm Water Utility Connection Charges Section 4-30 of city code sets out the fees associated with surface water management. A water quality and water quantity fee are collected with a subdivision. These fees are based on land use type and are intended to reflect the fact that the more intense the development type, the greater the degradation of surface water. This fee will be applied to the new lot of record being created. It is calculated as shown in the table below: ASSESSMENTS Water and sewer partial hookups are due at the time of final plat. The partial hookup fees will be assessed at the rate in effect at that time. The remaining partial hookups fees are due with the building permit. LANDSCAPING AND TREE PRESERVATION The applicant for the Foxwood development has submitted tree canopy coverage and preservation calculations. They are as follows: Total upland area (excluding wetlands) 29.648 ac. Baseline canopy coverage 58% or 17.38 ac. Minimum canopy coverage required 35% or 10.37 ac. Proposed tree preservation 27% or 7.86 ac. The developer does not meet minimum canopy coverage for the site; therefore, the applicant must bring the canopy coverage on site up to the 35% minimum. The difference between the Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 14 of 24 required coverage and the remaining coverage is multiplied by 1.2 for total area to be replaced. One tree is valued at 1,089 SF. Minimum canopy coverage to be replaced 2.5 ac Total number of trees to be planted 120 trees The applicant has proposed a total of 124 trees throughout the development, which satisfies the reforestation requirements. The applicant is required to provide bufferyard plantings along Great Plains Blvd. Bufferyard requirements are as shown in the table: Landscaping Item Required Proposed Bufferyard B – South property line, Lake Lucy Rd., 178’, 30’ width 2 overstory trees 3 understory trees 5 shrubs 2 overstory trees 8 understory trees 5 shrubs The applicant meets bufferyard landscaping requirements and has also provided a bufferyard planting area along the stormwater pond to the north of the entrance. MISCELLANEOUS Final grading plans and soil reports must be submitted to the Inspections Division before building permits will be issued. Buildings may be required to be designed by an architect and/or engineer as determined by the Building Official. Engineered design and building permits are required for retaining walls exceeding four feet in height. Submit proposed street-name(s) to Building Official and Fire Marshal for approval. Each lot must be provided with a separate sewer and water service. Demolition permits must be obtained before demolishing any structures. Proper removal, abandonment or sealing of storage tanks, on-site septic systems, wells, etc. is required. Permits are required, as applicable. If applicable, existing home(s) affected by the new street will require address changes. The applicant and or their agent shall meet with the Inspections Division as early as possible to discuss plan review and permit procedures. A three-foot clear space must be provided around the fire hydrants. No burning permits will be issued for tree, brush removal. Submit proposed street name to Chanhassen Building Official and Fire Marshal for review and approval. Street signs (temporary allowed) shall be installed prior to building permits being issued. Fire Marshal must approve signage. Prior to combustible construction fire hydrants shall be made serviceable. Prior to combustible home construction fire apparatus access roads capable of supporting the weight of fire apparatus shall be made serviceable. Additional fire hydrants will be required. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 15 of 24 PARKS AND OPEN SPACE The quality and number of recreational facilities in a community directly contributes to its quality of life. For this reason, the City of Chanhassen places a strong emphasis on parks and open space. As the City of Chanhassen has developed and increased in population, more pressure and attention has been given to providing recreational opportunities for our residents. Increased leisure time, health awareness, greater mobility, and high disposable incomes have all contributed to the increased demand for recreational activities. The challenge of the next century will be to provide facilities for a growing and diverse population. Parks can be defined as public areas that provide active or passive-oriented recreational facilities. A significant characteristic of parkland is its accessibility to its users. Open space is any parcel that is not used for buildings or other structures and is left in a natural state. Parks and open space perform diverse functions such as: meeting physical and psychological needs, enhancing and protecting the resource base, enhancing real estate values, and providing a positive impact on economic development. Park Plan The city’s comprehensive park plan calls for a neighborhood park to be located within one-half mile of every residence in the city. The park service area of community parks extends to a distance of 1-2 miles. The proposed Wilson Tree Farm Subdivision is located directly adjacent to the 58-acre Fox Woods Park Preserve and directly across Highway 101 from the 45-acre Bandimere Community Park. Bandimere Community Park offers a wide and growing array of recreational amenities and has been open to the public since 1999. Development of public access points to the Fox Woods Park Preserve, through a combination of vehicle and pedestrian touch points as well as the installation of a series of nature trails within the preserve, will begin concurrent with the development of the Wilson Nursery property. Additional acquisition of public open space through the application of park dedication requirements is not recommended as a condition of the subdivision. Trail Plan Residents purchasing homes within the new Wilson Tree Farm subdivision will have convenient pedestrian access to area public park facilities through careful planning and construction of some key pedestrian improvements:  Planning and construction of interior sidewalks within the subdivision. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 16 of 24  Planning and construction of two planned 10-foot wide trail connections leading from two cul-de-sacs into the Fox Woods Preserve.  Planning and construction of a Highway 101 trail connection between the current trail terminus at the Bandimere Park Pedestrian Underpass and the northern terminus of the plat adjacent to and along Highway 101.  Dedication of an outlot adjacent to Lot 32 and across the southern portion of Lot 46 to accommodate future construction of a trail.  The granting of a permanent 20 foot wide trail easement across the rear of lots 8 and 9, Block 3.  Trail right of ways within the subdivision shall be provided within outlots as a condition of the plat. Acquisition of trail easements outside of the plat shall be the responsibility of the City of Chanhassen. The Developer shall be responsible for the installation and payment of the two planned 10-foot wide trail connections leading from two cul-de-sacs into the Fox Woods Preserve. For those sections of the Hwy 101 trail situated north and south of their property boundaries, the Developer shall be reimbursed by the City of Chanhassen for the full cost of planning, engineering and construction of a planned 10-foot wide Highway 101 trail connection between the current trail terminus at the Bandimere Park Pedestrian Underpass and the northern terminus of the plat along Highway 101. For that section of the Highway 101 trail located within or adjacent to the Developer’s project boundary, the applicant shall be reimbursed by the City for the cost of the aggregate base, trail surfacing, retaining walls and storm water systems utilized to construct the trail. This reimbursement payment shall be made upon completion and acceptance of the trail and receipt of an invoice documenting the actual costs for the construction materials noted. Labor and installation for the trail surface and design, and engineering and testing services for all components of the Developers section, are not reimbursable expenses. All trails shall be 10 feet in width, surfaced with asphalt and constructed to meet city specifications. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 17 of 24 PERMITS At this time staff has determined that the developer must contact the following agencies for permits: a) Minnesota Department of Health for the water main. b) Minnesota Pollution Control Agency for the sanitary sewer system. c) Minnesota Pollution Control Agency for the NPDES storm water permit. d) Minnesota Department of Transportation for a Work in Right of Way permit for the force main installation. e) Minnesota Department of Transportation for a drainage permit. f) City of Chanhassen for building permits. FEES Based on the proposal the following fees would be collected with the development contract: a) Administration Fee: if the improvement costs are between $500,000 and $1,000,000, 2% of the improvement costs. If the improvement costs exceed $1,000,000, 2.5% of the first $1,000,000 plus 1.5% of the remainder. b) Surface water management fee: $218,662.84 c) A portion of the water hook-up charge: $2,065/unit d) A portion of the sanitary sewer hook-up charge: $691/unit e) Park dedication fee: $253,000 f) GIS fees: $25 for the plat plus $10 per parcel g) Street light operating fee for one year: $300 per light h) Area sewer fee for future trunk lift station and force main: Amount to be determined. COMPLIANCE TABLE Lot Area (sq. ft.) Lot Width Lot Depth 35 %Maximum Site Coverage (sq. ft.) Notes Code (RLM) 9,000 50 110 3,150 Single-Family Detached Housing Blk 1,Lot 1 12,600 90 140 4,410 Wetland Lot 2 15,147 100 130 5,301 Corner lot Lot 3 16,091 85 130 5,632 Cul-de-sac, show 10’ side setbacks, Wetland Lot 4 14,525 85 123 5,084 Cul-de-sac, wetland, show Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 18 of 24 Lot Area (sq. ft.) Lot Width Lot Depth 35 %Maximum Site Coverage (sq. ft.) Notes 30’ front Lot 5 15,123 85 118 5,293 Cul-de-sac, wetland, show 30’ front Lot 6 14,718 85 118 5,151 Cul-de-sac, wetland, show 30’ front Lot 7 17,581 103 146 6,153 Corner lot, wetland, show 30’ front Lot 8 11,739 90 121 4,109 Wetland Lot 9 12,799 90 126 4,480 Wetland Lot 10 14,240 90 130 4,984 Wetland, show 10’ side setbacks Lot 11 15,306 90 132 5,357 Lot 12 11,688 92 123 4,091 Lot 13 14,974 103 127 5,241 Corner lot Lot 14 12,133 120 127 4,247 Lot 15 11,980 102 196 4,193 Lot 16 18,390 72 139 6,437 Cul-de-sac, show 30’ front setback Lot 17 17,136 82 218 5,998 Cul-de-sac, Wetland, show 40’ front setback shown Lot 18 15,244 106 202 5,335 Cul-de-sac, Wetland Blk 2, Lot 1 12,599 110 124 4,410 Corner lot, Wetland Lot 2 11,652 91 133 4,078 Wetland, show 10’ side setbacks Blk 3, Lot 1 13,500 90 150 4,725 Lot 2 15,253 128 121 5,339 Show 10’ side setbacks Lot 3 17,814 106 139 6,235 Corner lot Lot 4 11,430 90 127 4,001 Lot 5 12,958 116 127 4,535 Lot 6 13,843 116 145 4,845 Lot 7 16,669 88 150 5,834 Shows 30’ front setback Lot 8 19,487 86 143 6,820 Cul-de-sac, Wetland Lot 9 17,911 91 158 6,269 Cul-de-sac, Wetland Blk 4, Lot 1 13,255 135 133 4,639 Wetland Lot 2 12,340 125 130 4,319 Wetland Blk 5, Lot 1 14,995 107 145 5,248 Wetland, Adjacent to private street Lot 2 11,200 81 132 3,920 Wetland Lot 3 12,105 108 132 4,237 Wetland Lot 4 14,557 158 130 5,095 Wetland Lot 5 # 120,342 216 507 42,120 Wetland, Paulsen residence Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 19 of 24 Lot Area (sq. ft.) Lot Width Lot Depth 35 %Maximum Site Coverage (sq. ft.) Notes Lot 6 13,634 100 130 4,772 Wetland Lot 7 12,096 85 136 4,091 Lot 8 13,598 82 153 4,759 Lot 9 15,699 82 179 5,495 Lot 10 15,214 100 204 5,325 Lot 11 16,829 82 204 5,890 Lot 12 13,683 90 151 4,789 Wetland Blk 6, Lot 1 21,204 122 177 7,421 Corner lot90 Lot 2 16,551 90 182 5,793 Lot 3 17,317 113 186 6,061 Adjacent to private street Outlot A 531,348 12.2 ac., Open Space/Wetland, Bluff Creek Primary Zone Outlot B 5,531 0.13 ac., Private Street Outlot C 58,500 1.34 ac., Open Space/Wetland Outlot D 243,114 5.58 ac.,Open Space /Wetland Outlot E 68,876 1.58 ac., Open Space/Wetland Outlot F 6,602 0.15 ac., Open Space/Wetland ROW 203,861 4.68 acres Average Lot Size * 15,321 Excludes Lot 5, Block 5 Total 1,896,980 43.55 Acres # Remnant of the lot surrounding the existing home to remain. * Lots range from 11,200 square feet to 21,204 square feet. RLM Setbacks: Front: 25 feet, Side: 10/5 feet - House/Garage side (minimum 15 feet separations between structures), Rear: 25 feet. Wetland Setback: Buffer 20 feet, buffer setback 30 feet. Bluff Creek Primary Zone Setback: 20 feet subject to approval of a 20-foot variance. VARIANCE The applicant’s variance request is for the use of a private street. This access will be for the two existing homes on the site. It will eliminate a shared driveway access on to Highway 101 and allow them to access via the new, local public street, which will be a safer access. The new street will line up with the access to Bandimere Park, creating a fun intersection. Staff believes this is a reasonable resolution for the access to the two existing homes that will remain. Outlots A and C contain the Bluff Creek Corridor primary zone. The Primary Corridor is designated open space. All structures must meet a 40-foot structural setback from the Primary Corridor boundary as required by Chanhassen City Code. However, since the city is designating the Primary Corridor Boundary as incidental to outlot A and C, which is more convenience then actual boundary, we recommend a blanket 20-foot setback, requiring a 20-foot variance. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 20 of 24 WETLAND ALTERATION PERMIT Staff cannot recommend approval of the Wetland Alteration Permit at this time. There is insufficient information to determine the extent of wetland impact let alone to determine if the required sequencing argument is met. At the time that sufficient information is submitted to make a determination the following conditions will apply: 1. The applicant must demonstrate that they have met the sequencing requirements of Minnesota Rules Chapter 8420.0520. 2. The applicant must provide the updated wetland boundary, supporting documentation and a georeferenced shapefile for approval by the LGU. 3. The applicant must get approvals from all other agencies with jurisdiction over wetlands on the site. 4. The applicant must identify a suitable replacement plan for any unavoidable impacts and submit to the City and other appropriate agencies for approval. RECOMMENDATION Staff recommends that the Planning Commission approve the Conditional Use Permit for development in the Bluff Creek Overlay District (BCOD), rezoning from Agricultural Estate District (A-2) to Residential Low and Medium Density (RLM), and a 46-lot preliminary plat with variances for a private street and a 20 foot Primary Corridor Boundary setback, plans prepared by Alliant Engineering, Inc. dated 5-6-16, subject to the following conditions, table the Wetland Alteration Permit and adoption of the attached Findings of Fact and Recommendation: Rezoning: 1. Contingent on final plat approval. Subdivision: Building: 1. Final grading plans and soil reports must be submitted to the Inspections Division before building permits will be issued. 2. Buildings may be required to be designed by an architect and/or engineer as determined by the Building Official. 3. Engineered design and building permits are required for retaining walls exceeding four feet in height. 4. Each lot must be provided with a separate sewer and water service. 5. Demolition permits must be obtained before demolishing any structures. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 21 of 24 6. Proper removal, abandonment or sealing of storage tanks, on-site septic systems, wells, etc. is required. Permits are required, as applicable. 7. If applicable, existing home(s) affected by the new street will require address changes. 8. Provide a 1:200 “clean” plat drawing. Engineering: 1. The 16.5’ wide telephone easement must be vacated before the City Council considers final plat approval. 2. The well on the property must be properly abandoned. 3. Label the contours on Sheet 2 of the Existing Conditions Survey. 4. The grading plan must be revised to eliminate the 3H:1V slope within the temporary cul-de-sac. 5. The developer shall dedicate an easement over the temporary cul-de-sac; the easement exhibit shall be submitted with the final plat application. 6. The private street within Outlot B and must be built to a 7-ton design. 7. Pedestrian curb ramps from the sidewalks to the street are required must be ADA-compliant. 8. The developer will install shallow monitoring wells or piezometers in the area of Lots 1-4, Block 5 and Lot 18, Block 1. Water elevations shall be monitored for a minimum of four weeks during a time when seasonally high water table would be expected. 9. An oversized drainage and utility easement is required at the back of Lot 1, Block 6 as this area conveys drainage from the adjacent parcel. Staff recommends that the 916’ contour extend into the drainageway to create a swale versus the sheet drainage pattern that is currently shown; it has been staff’s experience that landscaping/hardscaping/etc. on the downstream parcel tends to impede sheet drainage. 10. Per Section 18-40 (4) d. 2. v. a drain tile service is required for Lots 1-4 Block 5, Lot 6 Block 5; and Lots 1-3 Block 6 as these lots are proposed to drain from the back of the lot towards the street. 11. The developer’s engineer shall ensure that the maximum driveway grades shown on the plan are calculated such that a 10’ landing is provided where the driveway connects to the street and a five to 10-foot landing is provided at the garage. 12. On the grading plan label the existing contours. 13. The retaining wall on Lot 2, Block 4 must be outside of the drainage and utility easement. 14. The temporary lift station must be located outside of the temporary cul-de-sac. 15. The developer must work with staff to ensure that the invert elevation is at or higher than the invert elevation established during the concept planning of the undeveloped parcel to the south. 16. On Sheet 18 modify Note 2 to state that 10’ horizontal separation is required between water and sewer lines and modify Note 11 to state that sanitary sewer services shall be 6” diameter. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 22 of 24 Environmental Resources: 1. Prior to any grading, the applicant shall install tree preservation fencing using metal stakes. The fencing shall be placed fencing at the grading limits. Tree #2524 shall be included in the fencing area rather than fenced separately. These protections shall remain in effect until construction is completed. 2. Signage identifying outlot natural areas will be posted at property corners on lots 1, 3-6, 8-9, 17, 18, block 1 and lots 1, 2, block 2 and lots 8, 9, block 3 and lot 1-2, block 4. Fire: 1. A 3-foot clear space shall be maintained around fire hydrants. 2. Submit propose street names to Chanhassen Fire Marshal and Chanhassen Building Official for review and approval. 3. Street signs (temporary allowed) shall be installed prior to building permits being issued. Fire Marshal must approve signage. 4. Prior to combustible construction fire hydrants shall be made serviceable. 5. No burning permits will be issued for tree/brush removal. 6. Prior to combustible home construction fire apparatus access roads capable of supporting the weight of fire apparatus shall be made serviceable. 7. Additional fire hydrants will be required or relocated. Parks: 1. Full park dedication fees shall be collected per city ordinance in lieu of requiring parkland dedication; and 2. Dedication of an outlot adjacent to Lot 12, Block 5 and across the southern portion of Lot 5, Block 5 to accommodate future construction of a trail. 3. Planning, engineering and construction of two planned 10-foot wide trail connections leading from two cul-de-sacs into the Fox Woods Preserve. 4. Planning, engineering and construction of a planned 10-foot wide Highway 101 trail connection between the current trail terminus at the Bandimere Park Pedestrian Underpass and the northern terminus of the plat adjacent to and along Highway 101. 5. Trail right of ways within the subdivision shall be provided within outlots as a condition of the plat. Acquisition of trail easements outside of the plat shall be the responsibility of the City of Chanhassen. 6. The Developer shall be responsible for the installation and payment of the two planned 10- foot wide trail connections leading from two cul-de-sacs into the Fox Woods Preserve. 7. For those sections of the Hwy 101 trail situated north and south of their property boundaries, the Developer shall be reimbursed by the City of Chanhassen for the full cost of planning, engineering and construction of a planned 10-foot wide Highway 101 trail connection Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 23 of 24 between the current trail terminus at the Bandimere Park Pedestrian Underpass and the northern terminus of the plat along Highway 101. 8. For that section of the Highway 101 trail located within or adjacent to the Developer’s project boundary, the applicant shall be reimbursed by the City for the cost of the aggregate base, trail surfacing, retaining walls and storm water systems utilized to construct the trail. This reimbursement payment shall be made upon completion and acceptance of the trail and receipt of an invoice documenting the actual costs for the construction materials noted. Labor and installation for the trail surface and design, and engineering and testing services for all components of the Developers section, are not reimbursable expenses. 9. All trails shall be 10 feet in width, surfaced with asphalt and constructed to meet city specifications. 10. The granting of a permanent 20 foot wide trail easement across the rear of lots 8 and 9, Block 3. Water Resources Coordinator: 1. The model shall be modified to reflect the fact that current soil conditions and vegetative cover will have a lower bulk density and a higher infiltration rate than fully developed conditions. 2. The model must be modified to accurately reflect times of concentration for each drainage area. 3. In the absence of measured infiltration rates, the site should be modeled with conditions similar to what is anticipated given the soil survey and the proposed construction methodologies. 4. The wetlands cannot be used to meet rate control. Rate control must be achieved prior to discharge to any of the wetlands, MN DOT right-of-way or adjoining properties. 5. The infiltration basin areas shall be protected from construction traffic and other construction related activities throughout the duration of the project. This shall be noted on the grading plan, in the SWPPP and shown with pre-construction silt fence location. 6. The infiltration areas shall be graded last. The tributary area shall be graded and stabilized prior to excavation of the infiltration basins. 7. The mass grade phasing schedule shall include stripping and stockpiling of top soil material. 8. The grading and erosion plan shall include stockpile locations. 9. The SWPPP and erosion plan shall include topsoil quantities necessary to place six inches (6”) on all disturbed areas to be re-vegetated. 10. A detailed planting schedule and plan shall be included for each infiltration basin. 11. Redundant perimeter controls are required for all disturbs soils draining to wetlands. This may be silt fence, biologs, wind-rows of salvaged and stockpiled topsoil or other as approved by the city. 12. The developer shall be responsible for procuring the NPDES construction permit and providing proof to the city prior to any land disturbing activities. 13. The developer must meet the requirements of MN Rules Chapter 8420 and the Federal Clean Water Act. Planning Commission Foxwood – Planning Case 2016-13 June 7, 2016 Page 24 of 24 14. The development shall meet the CUP conditions for the Bluff Creek Overlay District. 15. Signage will be required at every lot corner and angle point along the private lots adjacent to the wetlands not bound by the BCOD. These must be installed prior to selling the lot. 16. Any grading within wetland buffers must be restored with native vegetation. A planting schedule and vegetation maintenance plan of at least 3 years shall be provided to the city for review and approval. 17. The Storm Water Utility Connection Charge due at final plat is estimated to be $218,662.84 Conditional Use Permit: 1. Infiltration basin IB1 located north of Lots 10, 11, 16 and 17 of block 1 shall be evaluated for methods to reduce tree loss. 2. The Bluff Creek Overlay District Boundaries shall be shown to be incidental with the boundaries of Outlots A and C. 3. Any grading within the Bluff Creek Overlay District must be restored with native vegetation. A planting schedule and vegetation maintenance plan of at least 3 years shall be provided to the city for review and approval. 4. Signage will be required at every lot corner and angle point along the private lots adjacent to the BCOD. The sign language shall be provided by the city and the signs shall be at the developer’s expense. These signs shall be placed by the developer prior to selling any of the lots. ATTACHMENTS 1. Findings of Fact and Recommendation 2. Development Review Application 3. Property Survey Sheets 1 & 2 4. Preliminary Plat Sheets 4-6 5. Site Plan Sheet 7 6. Grading and Drainage Plan Sheet 10 7. Grading Profiles Sheet 13 8. Erosion and Sediment Control Plan Sheet 14 9. Erosion and Sediment Control Notes and Details Sheet 17 10. Utility Plan Sheet 18 11. Wetland Management Plan Sheet 22 12. Tree Canopy Coverage Plan Sheets 23 & 24 13. Tree Inventory and Preservation Plan Sheets 27-29 14. Memo from Scott Barr Engineering to Bob Generous 15. Memo from Michael Corbett, Minnesota Department of Transportation to Bob Generous 16. Public Hearing Notice and Affidavit of Mailing List g:\plan\2016 planning cases\2016-13 - foxwood cup, rezoning & subdivision\staff report foxwood.doc