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HomeMy WebLinkAbout4B Jeffers Pond 7th Addn Preliminary Plat & PUD AmendMEETING DATE: MARCH 18, 2013 AGENDA #: 4B PREPARED BY: JEFF MATZKE, PLANNER AGENDA ITEM: A PUBLIC HEARING TO CONSIDER A REQUEST FOR APPROVAL OF A MAJOR AMENDMENT TO THE PLANNED UNIT DEVELOPMENT KNOWN AS JEFFERS POND AND PRELIMINARY PLAT TO BE KNOWN AS JEFFERS POND 7T" ADDITION DISCUSSION: Introduction The Jeffers Foundation has applied for approval of a major amendment to the Planned Unit Development (PUD) known as Jeffers Pond and approval of a Preliminary Plat to be known as Jeffers Pond 7th Addition. The area of consideration for the major PUD Amendment and Preliminary Plat applies to undeveloped portion of Jeffers Pond known as The Shores. The site is located south of Jeffers Parkway, east of McKenna Road, and '/ mile west of CSAH 21. The applications include the following requests: Approve a major Amendment to the Jeffers Pond Planned Unit Development Approve a Preliminary Plat to be known as Jeffers Pond 7th Addition History In 2005, the City Council approved a PUD for the approximately 336 acre Jeffers Pond mixed use development including the following elements: • Mix of land uses including commercial retail and office; low, medium, and high density residential; and public institutional and municipal sites • Up to 693 total residential units. • An active park of at least 4.6 acres (Jeffers Pond Park) • An fire station site (Prior Lake Station #2) • An elementary school site (Jeffers Pond Elementary School) • Public parkland and trails (over 145 acres of parkland has been created) Seven phases within the PUD development have been platted including sites for 156 single family homes, 165 townhomes, Jeffers Pond Elementary School, and Prior Lake Fire Station #2. Current Circumstances The current proposal calls for a redesign of the original 28 single-family attached home lots to be constructed within an undeveloped area known as Outlot F (The Shores of Jeffers Waterfront). The Shores have already been developed with 20 attached home lots which front along Jeffers Parkway. The redesign of Outlot F proposes 23 detached single family home lots. Phone 952.4 47.9800 / Fax 952.447.4245 / w%vw.cityofjrrior1ake.com The following paragraphs outline the physical characteristics of the existing site, the Comprehensive Plan and zoning designations, and a description of some of the specifics of the site. PHYSICAL SITE CHARACTERISTICS: Total Site Area: The total site area consists of 5.36 acres. Topography, This site has varied topography, with elevations ranging from 890' MSL near the cul-de-sac entrance to 866' MSL near the high water elevation of the wetlands. Vegetation; The natural vegetation on the site was cleared after the original preliminary/final plat was approved for the area. The project is subject to the Tree Preservation requirements of the Zoning Ordinance. Wetlands: The project site contains two wetlands areas. These wetlands will not be impacted under the current proposal. Access: Access to the site is from Jeffers Parkway (public street). 2030_ Comprehensive Plan Designation: This property is designated for Low Density Residential uses on the 2030 Comprehensive Plan Land Use Map. Zoning: The site is presently within the Jeffers Pond PUD (Planned Unit Development). The originally approved density (net) of this area is 7.15 units per acre. The density for the proposed plat is 5.87 units per acre. PROPOSED PLAN Lots: The plan calls for 23 lots to be constructed with a single family rambler or 1'/ -story homes. The lots range in size from 5,392 square feet to 11,256 square feet with an average lot size of 7,422 square feet. The originally designed attached single family lots ranged in size from 5,000 square feet to 10,000 square feet. The proposed residential housing units are conceptually planned to range in size from 3,000-3,400 sq. ft. The units propose to include 2 -car garages. In comparison, the existing attached homes for "The Shores" included approximately 3,000 - 3,100 sq. ft. Setbacks: The typical residential required setbacks and proposed setbacks for the development are shown on the following table: Structure Setbacks Typical Requirement Originally Approved Proposed Front 25' 15' 15' Interior Side 10' NA 7.5' Building to Building NA 15' 15' Rear 25' NA 10' Wetland 30' 30' 30' min. Cantilever/Eves/Egress Pit Setback Encroachments 2' NA 1' maximum Streets: Shore Crest Drive is proposed as a cul-de-sac. This street is proposed in a similar location as previously approved, however; the street was previously approved as a private street. The Developer is proposing to designate Shore Crest Trail as a public street. City Staff has reviewed the street design and believes the street would be adequately designed to public street standards as long as public drainage and utility easements are dedicated in the front yards of the Lot 8, Block 2 and Lot 1, Block 3 (intersection of Jeffers Parkway) to provided for needed right-of-way purposes. This is due to the limited width proposed for public right-of-way dedication of Shore Crest Trail in the first 60 feet from the intersection with Jeffers Parkway. Impervious Surface: The originally approved maximum impervious surface for the 48 lot "Shores of Jeffers Waterfront" development was 158,024 square feet. The cumulative impervious surface for the proposed 23 detached home lots and the existing 20 attached home lots is 158,011 square feet, thereby reducing the previously approved impervious surface for The Shores. The developer has provided a table listing the maximum impervious surface per lot which will enable City Staff to track the impervious surface as each lot is constructed. The overall impervious surface for the entire Jeffers Pond Development would continue to be less than (24.5%) the original impervious surface maximum amount (25.5%) approved in 2005. Parks: In 2005, the Jeffers Pond Development was created with over 145 acres of dedicated natural public parkland. This original park dedication satisfies the total parkland requirement for all phases of the Jeffers Pond Development including The Shore. Sanitary Sewerlwater Mains: Sanitary sewer and water mains are currently in place along Jeffers Parkway. Proposed utility mains running under Shore Crest Drive cul-de-sac will connect to these existing utilities. Landscape Plan: The Subdivision Ordinance requires two front yard subdivision trees per lot (4 for corner lots). The developer will be required to follow a landscape plan design which satisfies this Ordinance requirement. Fees and Assessments: This development will be subject to the standard development fees including park dedication, trunk street and utility service charges, and utility connection charges. ISSUES: Section 1106.400 of the Zoning Ordinance lists the types of uses and standards allowed under a PUD. The PUD provisions offer maximum flexibility in many areas, some of which include such aspects as setbacks, building heights, and densities. The developer is requesting modifications to the minimum lot areas for the single family lots, as well as building setbacks for the proposed single family lots. The proposed detached single family lot design will reduce the overall impervious surface of Tiers 1 and 2. The Jeffers Foundation has met with City staff to address the proposed changes to the PUD and ways to maintain the core of the originally approved plan of the Jeffers Pond Development. As noted in the attached staff memorandums from the Engineering and Community & Economic Development Departments, the developer must refine the plans to assure compliance with the Public Work Design Manual requirements and City Zoning Ordinance. However, none of these revisions will likely impact the general design of the proposed plat. If any significant modifications to the plat are necessary, the developer will be required to resubmit for Preliminary Plat consideration and a new public hearing will be held before the Planning Commission. Therefore, if the Planning Commission finds the PUD and preliminary plat acceptable, the staff would recommend the following conditions be attached: 1. The developer must obtain the required permits from any other state or local agency prior to any work on the site. 2. Revise the plans to address all of the comments in the memorandum from the City Engineering Department dated February 21, 2013, 3. Revise the plans to address all of the comments in the memorandum from the City Community & Economic Development Department dated February 20, 2013. ALTERNATIVES: The Planning Commission has the following alternatives: Recommend approval of the PUD Amendment to the Jeffers Pond PUD Plan and the Preliminary Plat subject to the conditions identified by the Planning Commission. 2. Table this item to another Planning Commission meeting and provide the developer with direction on the issues that have been discussed. 3. Recommend denial of the request. RECOMMENDED 1. A motion and second to recommend approval of a major amendment to the MOTIONS: final PUD Plan for Jeffers Pond, subject to the listed conditions. 2. A motion and second to recommend approval of a Preliminary Plat known as Jeffers Pond 7th Addition, subject to the listed conditions. EXHIBITS: 1. Location Map 2. Jeffers Pond 7'� Development Plans 3. Engineering Dept. Memorandum dated 2-21-13 4. Community Development Dept. 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The level of detail for the plan set was more in line with a final plat application. As a result, many comments are final plat comments. Comments highlighted in bold text are of particular concern: General 1. The final plat plans should follow the requirements of the Public Works Design Manual. 2. Permits frons the Met Council, Minnesota Pollution Control Agency, and Department of Health are needed. 3. Show approximate location of all existing private utilities and public utilities. 4. City Project 413-104 should be shown on all plan sheets. 5. Show front/side/rear yard easements on all plan sheets. 6. All plans should be drafted according to the City of Prior Lake layer system. A digital copy of the plans in pdf or of format is required prior to construction. All drawings should use the Scott County Coordinate System. 7. Provide note on the plans stating that working hours are from 7 am to 7 pin Monday through Friday and 8 am to 5 pm Saturday. 8. Show property address of properties adjacent to the project area. 9. Provide survey sheet that includes all spot elevations shot for this project. Include datum information on the sheet. Grading 1. The contours at the enol of the cul-de-sac do not tie out. The area near the trail is of the greatest concern. Please review the proposed contours at the end of the cul-de- sac. 2. Show wetland buffer and wetland buffer signage on the plans. Setbacks from wetlands must be checked to verify distance requirements. Phone 952.447.9800 1 Fax 952.447.42451 %mAv.cityofprior1ake.con3 3. Linetypes for the contours are confusing as three different linetypes exist for the contouring. The existing ground shots should be shown on the existing conditions sheet. 4. Show all emergency overflow routes on the plans using arrows and show the elevation of the high point along the emergency overflow route. Several street low points, wetland areas, and ponding areas require EOF labeling. 5. Backyard drainage swales exceeding 300 feet or draining over 8 lots require storm sewer piping and corresponding outlots. Please review backyard drainage swale behind lots 7- 11. Could this sivale are be eliminated by changing the grading to flow across the trail. If drainage swales are shown, additional drainage and utility easement will be necessary. 6. Any backyard drainage paths must be sodded and protected at the conclusion of grading activities. Provide notes indicating that this protection is needed. 7. Show the top and bottom elevations of existing retaining wall. A fence will be needed for the existing retaining wall adjacent the trail within Outlot A. 8. Show double row of silt fence for areas that drain to wetlands. 9. Show outlet elevation, emergency overflow elevation, NWL and HWL for ponds and OHWL for water bodies. 10. Provide name of company, contact person and emergency phone number for person responsible for erosion control on the project. 11. Provide note on the plans specifying that perimeter downstream sediment control best management practices must be installed by the Contractor and inspected by the City prior to any site work. Utilities 1. Storm sewer is shown does not meet the minimum grade requirments of 0.5%. 2. Manholes are shown for bends in the storm sewer. Catch basins/manholes could be used in lieu of manholes and ,,vould help ensure the manholes are not within the wheelpath. 3. CBMH 902 should have a 3 foot sump. 4. All pipes outside the roadway areas should have rhino marking posts as specified in the public works design manual. 5. Sanitary sewer from MH 2 and MH1 should be SDR 26. Streets 1. Provide geotechnical analysis report for soil borings in the project area. Show soil boring locations on all plan sheets. A pavement section recommendation will be needed based on the borings for the final plat. 2. If proposed as a public street, remove the island within the cul-de-sac. 3. If proposed as a public street, additional easement may be needed for the existing lots near the intersection of Jeffers Parkway and Shore Crest Drive. Show right of way and easements for properties at the entrance of Shore Crest Drive. 4. Pedestrian ramps for the trail connections to Shore Crest Drive will be required at the time of final plat. 5. Typical section should include crown of the roadway. 6. The road profile should be extended to show the existing roadway at the connection to Jeffers Parkway. 7. Provide note on the plans stating that the final date for paving of the bituminous base course is November I" and the final date for paving the bituminous wear course is September 30t". No paving shall commence prior to the removal of seasonal road restrictions. 8. Show sheet lighting locations on the plans. 9. Horizontal curves should be reviewed for 30 mph design. Hydroloey anti Storm Sewer 1. PWDM 111.2 FORMAT AND STANDARDS a. Please submit a storrnwater management report that includes a narrative to describe how the existing pond and infiltration basin will function and data to confirm that the system has the capacity to support the proposed development. Summarize the volume control requirement in ac -ft or ac -in, the rate control requirement in CFS to each point of discharge, and water quality in terms of lb P and Ton TSS to each point of discharge. Tabulate all existing proposed soil type and land use, and list CN assumptions for each combination. b. Show or define access routes for maintenance purposes to all inlets or outlets at ponding areas (must be a maximum 8% grade, 2% cross slope, and 10 feet wide). Paving or pavers on the access routes is required with a design load that will support maintenance vehicles. 2. PWDM I1I.4 SITE HYDROLOGY, STORMWATER, AND VOLUME MANAGEMENT a. Rate control is required; 2-, 10- and 100 -year (24-hour NRCS Type II) events shall be modeled. Events for Prior Lake are 2.8", 4.2" and 6.0" for the 2-, 10- and 100 -year storms respectively. The project is located within Stormwater Management Overlay District 41; rate control shall hold total offsite peak runoff at or below the following schedule: 2 -year: 0.25 cfs per net ctcre; 10 -year: 0.25 cfs per net acre; 100 -year: 0.25 cfs per net ctcre. Provide information to show that the existing pond will meet city requirements (including other pond design requirements outlined in Section 7). b. Volume control is required; site runoff volume shall be reduced in the proposed condition by a volume equal to or greater than 0.5 inch over all new impervious surfaces. All sites may consider the use of curve number reductions to meet a portion of the volume control requirement. Methods include tree plantings, native grass buffers, porous pavements, impervious disconnections, green roofs, constructed wetlands, and soil amendments. Examples of credit reduction calculation is found in the PWDM Section 9. Tabulate the proposed credits by discharge point. c. An infiltration basin was constructed for this project during mass grading. Submit information to show that the basin will meet requirements for volume control (e.g., infiltration rate test results on the existing basin). Include a cross section detail for the infiltration basins, including information on original design and function. Provide information on measured infiltration rates for the existing infiltration features. d. Low floor elevations shall be at least 3 feet above the OHW or highest known water elevation (whichever is greater) and 2 feet above the HWL for ponds/basins/wetlands. Low opening elevations shall be at least 2 feet above EOF. e. The water quality treatment standard is 60% reduction in total phosphorus and 90% reduction in TSS, based on standard wet pool detention pond design criteria. Provide documentation to demonstrate the water quality performance of the existing wet pond. 3. PWDM 11I.6 WETLANDS: Wetlands buffers should be shown on the plans. Plan should provide detail and location for wetland buffer signs. 4. PWDM 111.8 STORM SEWER: Pipe grade should be a minimum of 0.5%. Some pipes were noted with shallower grade. SWPPP 1. An NPDES Construction site permit will be required for this project. The City must approve the associated SWPPP prior to grading permit approval. 2. The silt fence protecting the pond and infiltration basin should be moved closer to the road and further from the stormwater management features. 3. Provide a detail for straw bio rolls noted ori Sheet 6. A "Temp Sedimentation Trench" detail is provided on Sheet 7 but this structure is not shown on the plan view. Clarify which method will be used on this project. 4. Most required elements of a SWPPP are included in the plan set. Please update the plans with the following standard information: a. NPDES 111.A.1: Identify a person knowledgeable and experienced in the application of erosion prevention and sediment control BMPs who will oversee the implementation of the SWPPP, and the installation, inspection and maintenance of the erosion prevention and sediment control BMPs before and during construction. b. NPDES III.A,3.c; Estimated preliminary quantities tabulation anticipated at the start of the project for the life of the project must be included for all erosion prevention and sediment control BMPs in the SWPPP. c. NPDES III.E,4.c: The Permittee(s) must remove all deltas and sediment deposited in surface waters, including drainage ways, catch basins, and other drainage systems, and restabilize the areas where sediment removal results in exposed soil. The removal and stabilization must take place within seven (7) days of discovery unless precluded by legal, regulatory, or physical access constraints. The Permittee shall use all reasonable efforts to obtain access, If precluded, removal and stabilization must take place within seven (7) calendar days of obtaining access. d. NPDES III.E.4.d: Construction site vehicle exit locations must be inspected for evidence of off-site sediment tracking onto paved surfaces. Tracked sediment must be removed from all paved surfaces, within 24 hours of discovery. e. NPDES IIIYA: All liquid and solid wastes generated by concrete washout operations must be contained in a leak -proof containment facility or impermeable liner. A compacted clay liner that does not allow washout liquids to enter ground water is considered an impermeable liner. The liquid and solid wastes must not contact the ground, and there must not be runoff from the concrete washout operations or areas. Liquid and solid wastes must be disposed of properly and in compliance with MPCA regulations, A sign must be installed adjacent to each washout facility to inform concrete equipment operators to utilize the proper facilities. Memo �llVNSS��A Date: February 20, 2013 To: Kelly Murray, Jeffers Foundation Ftofn: Jeff Matzke, Planner Subject: JEFFERS POND 7TH Preliminary Plat City Project #13-104 The Community & Economic Development Department has reviewed the Preliminary Plat for the subject project with a plan date of January 11, 2013 and we have the following comments: General 1. Estimated development fees for this project based on proposed plan net acres (5.274 acres) are $83,202. These fees include Street Oversize Charge, Trunk Sewer Charge, Trunk Water Charge, and Trunk Storm Water Charge. Additional 4% Administration Fee and 5% Construction Observation Fee based on engineer's final construction estimate will also be charged. Detailed fee information will be established in the Final Development Agreement at the time of Final Plat, PUD Site Plan I. Plan is at 60 scale rather than 50 scale as identified. 2. Identify 30 foot wetland setback from HWL 871.3 elevation for DNR Public Water ##150W. 3. Proposed Impervious Surface on Page 4 is listed at 158,011 sq ft total and on Page 5 is listed as 158,024 sq ft. Please change to be consistent. 4. Setback Chart a. Please establish a proposed cantilever maximum sq ft. limit, All cantilevers are impervious surface area and should therefore be added to proposed impervious surface amounts. b. Will cantilevers which encroach into building setbacks also have additional eves that encroach? Comments under Eves indicate 1 ft encroachment as do Cantilevers. c. AC units are not allowed in side yard setbacks (7.5 ft proposed) by ordinance. Therefore, unless otherwise listed under chart, these units will be required to be placed in the rear yard. Tree_ Preservation Plan 1 Landscape Plan 1. Prairiefire Crab and Sugar Tyme Crab labels on plan do not match Key label in chart. Phone 952.447.9800 / Fax 952,447.4245 /,6+,ww.cityofpriorl ike.com