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1c-1 Minnewashta Creek Hill Final Plat Approval CITY OF CHANHASSEN 7700 Market Boulevard PO Box 147 Chanhassen, MN 55317 Administration Phone 952.227.1100 Fax 952.227.1110 Building Inspections Phone 952.227.1180 Fax 952.227.1190 Engineering Phone 952.227.1160 Fax 952.227.1170 Finance Phone 952.227.1140 Fax 952.227.1110 Park & Recreation Phone 952.227.1120 Fax 952.227.1110 Recreation Center 2310 Coulter Boulevard Phone 952.227.1400 Fax 952.227.1404 Planning & Natural Resources Phone 952.227.1130 Fax 952.227.1110 Public Works 1591 Park Road Phone 952.227.1300 Fax 952.227.1310 Senior Center Phone 952.227.1125 Fax 952.227.1110 Web Site www.ci.chanhassen.mn.us 1e,-1 IT . i.. MEMORANDUM TO: Todd Gerhardt, City Manager FROM: Sharmeen Al-Jaff, Senior Planner DATE: November 28, 2005 D~ SUBJ: Minnewashta Creek Hill Final Plat Approval, Robert Rick. Planning Case #05-25 PROPOSAL SUMMARY The developer is requesting final plat approval to subdivide a 1.4 Acre Lot into Three (3) Single-Family Lots with a Variance, Minnewashta Creek Hill ACTION REQUIRED City Council approval requires a majority of City Council present. BACKGROUND On August 22, 2005, the City Council adopted the following motion: The City Council approves the preliminary plat for Planning Case 05-25 for Minnewashta Creek Hill for 3 lots and a variance to run a private street as shown on the plans received July 20, 2005, subject to the following conditions: 1. Environmental Resources Specialist Conditions: a. Tree preservation fencing shall be installed at the edge of grading limits prior to any construction. Fencing shall be maintained until construction is completed. b. Any preserved trees removed will be replaced at a rate of 2: 1 diameter inches. Finding: This condition still applies. 2. Park and Recreation Conditions: a. In lieu of any land dedication, full park fees shall be collected at the time of platting. With the one existing home, the total park fee for Minnewashta Creek Hill will be $8,000. b. Additional trail construction is not required as a part of this project; however during demolition and construction, the existing pedestrian trail shall be protected and remain open. No construction equipment shall be parked on or use the trail as a staging area during construction. In addition, all match points encountered on the trail for demolition and/or construction shall be professionally constructed. The City 01 Chanhassen · A growing community with clean lakes, quality schools, a charming downtown, thriving businesses, winding trails, and beautiful parks. A great place to live, work, and play. Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28, 2005 Page 2 Finding: This condition still applies. 3. Detailed grading, drainage, tree removal and erosion control plans must be submitted with the building permit for each lot. Finding: This condition still applies. 4. The driveway grade must be adjusted so that runoff from the driveway will sheet drain to the east. The grades east of the proposed private drive must be adjusted to provide a drainage swale along the east side of the driveway to the proposed catch basin. Finding: This condition has been met. 5. Any proposed retaining wall over four feet high requires a building permit and must be designed by a Professional Engineer registered in the State of Minnesota. Finding: This condition still applies. 6. Tree preservation fencing must be installed at the limits of tree removal. All disturbed areas, as a result of construction, shall be seeded and mulched or sodded immediately after grading to minimize erosion. Finding: This condition has been modified to read "Tree preservation fencing must be installed at the grading limits of tree removal. All disturbed areas, as a result of construction, shall be seeded and mulched or sodded immediately after grading to minimize erosion." 7. A 75-foot minimum rock construction entrance must be added to the entrance that will be accessed during construction. Finding: This condition has been met. 8. If importing or exporting material for development of the site is necessary, the applicant will be required to supply the City with a detailed haul route and traffic control plan. Finding: This condition still applies. 9. The developer shall also extend storm sewer from the existing storm sewer manhole within Minnewashta Parkway at the south end of the property. The upstream storm sewer structure shall have a catch basin cover and a three-foot sump. Finding: This condition has been met. 10. The lateral sanitary sewer and watermain connections to the existing trunk utilities must be north of the proposed private drive. The developer shall extend 8-inch lateral sanitary sewer from the existing manhole (top elevation 951.23'). Finding: This condition has been met. Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28,2005 Page 3 11. A manhole must be installed wherever a bend is proposed in the sanitary sewer. Individual sanitary sewer services must be 6-inch diameter. Finding: This condition has been met. 12. Six-inch lateral watermain shall be wet tapped from the existing trunk utility. Finding: This condition. has been met. 13. A gate valve must be installed immediately west of the wet tap. Finding: This condition has been met. 14. A hydrant is required at the end of the proposed watermain for flushing purposes. Finding: This condition has been met. 15. Additional drainage and utility easements may be required based on the revised utility plan. Easements shall be minimum 20-feet wide centered over each utility. Finding: This condition still applies. 16. According to the City's Finance Department records, the parcel was previously assessed for one sanitary sewer and water hookup, therefore sanitary sewer and water hookup charges must be paid for two lots. The 2005 trunk hookup charge is $1,458.00 for sanitary sewer and $2,955.00 for water-main. Finding: This condition still applies. 17. Public utility improvements are required to be constructed in accordance with the City's latest edition of Standard Specifications and Detail Plates. Finding: This condition still applies. 18. Detailed construction plans and specifications must be submitted at time of final plat. Finding: This condition has been met. 19. The applicant is required to enter into a development contract with the City and supply the necessary financial security in the form of a letter of credit or cash escrow to guarantee installation of the improvements and the conditions of final plat approval. Finding: This condition still applies. 20. Permits from the appropriate regulatory agencies will have to be obtained, including but not limited to the MPCA, Department of Health, MCES, and Watershed District. Finding: This condition still applies. Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28, 2005 Page 4 21. The driveway easement must clearly stipulate that the owners of Lots 1-3, Block 1, Minnewashta Creek Hill shall own and maintain the private drive and the private storm sewer north of the private driveway. The private street must be built to a 7-ton design, 20-foot width. The developer will be required to submit inspection reports certifying this. Finding: This condition still applies. 22. Water Resource Coordinator Conditions: a. The grading plan shall be revised to show silt fence down slope of all disturbed areas. Chanhassen's standard detail for silt fence (Plate 5300) shall be included in the plans. Finding: This condition has been met. b. Erosion control blanket shall be installed on all slopes greater than or equal to 3: 1. All exposed soil areas shall have temporary erosion protection or permanent cover year round, according to the following table of slopes and time frames: Type of Slope Steeper than 3: 1 10:1 to 3:1 Flatter than 10: 1 Time 7 days 14 days 21 days (Maximum time an area can remain open when the area is not actively being worked.) These areas include constructed storm water management pond side slopes, and any exposed soil areas with a positive slope to a storm water conveyance system, such as a curb and gutter system, storm sewer inlet, temporary or permanent drainage ditch or other natural or man made systems that discharge to a surface water. Finding: This condition has been met. c. Street cleaning of soil tracked onto public streets shall include daily street scraping and street sweeping as-needed. Finding: This condition has been met. d. The estimated total SWMP fee, due payable to the City at the time of final plat recording, is $5,355. Finding: This condition still applies. e. The applicant shall apply for and obtain permits from the appropriate regulatory agencies as necessary (e.g., Minnesota Pollution Control Agency (NPDES Phase IT Construction Site Permit), (for dewatering)) and comply with their conditions of approval. Finding: This condition still applies. Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28,2005 Page 5 23. Building Official Conditions: a. A final grading plan and soils report must be submitted to the Inspections Division before building permits will be issued. Finding: This condition still applies. b. Demolition permits must be obtained prior to demolishing any structures on the site. Finding: This condition still applies. c. Separate water and sewer services must be provided for each lot and must have a separate connection to the public sewer or to a manhole which is connected to the public sewer. Finding: This condition still applies. d. Curb box valves cannot be located in driveways. Finding: This condition still applies. e. Permits are required for retaining walls. Walls over four feet high must be designed by a professional engineer. Finding: This condition still applies. f. The developer must submit a proposed name for the private drive. Finding: This condition still applies. 24. Fire Marshal Conditions: a. The new proposed private street will need a street name. Submit name to Chanhassen Building Official and Chanhassen Fire Marshal for review and approval. b. No burning permits will be issued for trees to be removed. Trees and shrubs must either be removed from site or chipped. c. Temporary street signs shall be installed on street intersections when construction of a new roadway allows passage of vehicles. Pursuant to 2002 Minnesota Fire Code Section 501.4. d. A fire apparatus access road shall be designed and maintained to support the imposed load of fire apparatus and shall be serviced so as to provide all weather driving capabilities. Pursuant to Minnesota Fire Code Section 503.2.3." Finding: This condition still applies. Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28, 2005 Page 6 25. The applicant will work with staff to address the issues of safety of the private street accessing onto Minnewashta Parkway, drainage towards the lake, and providing appropriate parking and turn around areas. Finding: This condition has been met. 26. The applicant will extend the private street in order to provide an adequate turn around on Lot 3. Finding: This condition has been met. FINAL PLAT The applicant is proposing to subdivide a 1.4 acre site into 3 single-family lots. The gross and net density of the site is 2.1 units per acre. All three lots exceed the minimum 15,000 square feet of area, with an average lot size of 20,457 square feet. All three proposed lots meet the minimum width and depth requirements of the Zoning Ordinance. These lots will be served by a private street. This development is in the shoreland management district which requires a 20-foot setback from the private street. The private street roadway shall not be included with the calculations of the hard surface coverage of the individual lots. Staff notes that the proposal is consistent with the Comprehensive Plan and generally consistent with the Zoning Ordinance. GRADING. DRAINAGE & EROSION CONTROL The 1.41-acre site currently has one single-family home amid numerous significant trees. The existing house and driveway will be removed. Due to the environmental sensitivity of the site, the developer proposes to construct a 20-foot wide private street within a 30-foot wide driveway, drainage and utility easement. This proposal requires mass grading of approximately half of the site to construct the private street, resulting in saving 80% of the trees. The developer proposes custom-graded lots for all three lots, therefore detailed grading, drainage, tree removal and erosion control plans must be submitted with the building permit for each lot. As-built surveys for each lot must also be submitted before a Certificate of Occupancy will be issued. The site currently drains from the southwest to the north and to the east. The proposed drainage pattern is consistent with the existing drainage pattern and will not increase the surface area draining to the existing single-family property to the north. The developer has submitted drainage calculations for the existing and proposed conditions, which indicate that the proposed development will not significantly increase the amount or rate of runoff from the site. Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28, 2005 Page 7 The developer will extend private storm sewer from the existing 27" trunk storm sewer within Minnewashta Parkway to the site. This storm sewer will capture runoff from the proposed private driveway and from the front yard of Lot 2. The plan does not identify any retaining walls. Any proposed retaining wall over four feet high requires a building permit and must be designed by a Professional Engineer registered in the State of Minnesota. Tree preservation fencing must be installed at the limits of tree removal. All disturbed areas, as a result of construction, shall be seeded and mulched or sodded immediately after grading to minimize erosion. A 75-foot minimum rock construction entrance must be added to the entrance that will be accessed during construction. If importing or exporting material for development of the site is necessary, the applicant will be required to supply the City with a detailed haul route and traffic control plan. SURFACE WATER MANAGEMENT FEES Water Quality Fees Because of the impervious surface associated with this development, the water quality fees for this proposed development are based on single-family residential development rates of $1,093/acre. Based on the proposed developed area of approximately 1.41 acres, the water quality fees associated with this project are $1,541. Water Quantity Fees The SWMP has established a connection charge for the different land uses based on an average citywide rate for the installation of water quantity systems. This cost includes land acquisition, proposed SWMP culverts, open channels, and storm water ponding areas for runoff storage. Single- family residential developments have a connection charge of $2,705 per developable acre. This results in a water quantity fee of approximately $3,814 for the proposed development. At this time, the estimated total SWMP fee, due payable to the City at the time of final plat recording, is $5,355. Other Agencies The applicant shall apply for and obtain permits from the appropriate regulatory agencies as necessary (e.g., Minnesota Pollution Control Agency (NPDES Phase II Construction Site Permit), (for dewatering)) and comply with their conditions of approval. UTILITIES The developer proposes to extend storm sewer from the existing storm sewer manhole within Minnewashta Parkway at the south end of the property. The upstream storm sewer structure will have a three-foot sump. The developer proposes to extend 6" lateral sanitary sewer from the eXIstmg stub within Minnewashta Parkway to the proposed manhole within the private driveway. The as-built utility Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28, 2005 Page 8 information for this area does not show a sanitary sewer stub at this location. The utility plan identifies a 4" wet tap from the existing 12" trunk watermain within Minnewashta Parkway and installing 4" lateral watermain to the south side of the private drive. The lateral sanitary sewer and watermain connections to the existing trunk utilities must be north of the proposed private drive. The developer shall extend 8" lateral sanitary sewer from the existing manhole (top elevation 951.23'). The alignment of the lateral sanitary sewer within the site shall be similar to the original proposal, however a manhole must be installed wherever a bend is proposed in the sanitary sewer. Individual sanitary sewer services must be 6" diameter. Six inch lateral watermain will be wet tapped from the existing trunk utility. A gate valve must be installed immediately west of the wet tap. A hydrant is proposed at the end of the proposed watermain for flushing purposes. Both the lateral watermain and sanitary sewer will be publicly owned and maintained. Additional drainage and utility easements may be required based on the revised utility plan. Easements shall be minimum 20 feet wide centered over each utility. The developer will be responsible for extending lateral sewer and watermain within the site, therefore the sanitary sewer and water lateral charges will be waived. According to the City's Finance Department records, the parcel was previously assessed for one sanitary sewer and water hookup, therefore sanitary sewer and water hookup charges must be paid for two lots. The 2005 trunk hookup charge is $1,458.00 for sanitary sewer and $2,955.00 for water-main. Sanitary sewer and water-main hookup fees may be specially assessed against the parcel at the time of building permit issuance. All of these charges are based on the number of SAC units assigned by the Met Council. The existing sanitary sewer and water services to the existing home must be removed or properly abandoned. Public utility improvements are required to be constructed in accordance with the City's latest edition of Standard Specifications and Detail Plates. Detailed construction plans and specifications must be submitted at time of final plat. The applicant is required to enter into a development contract with the City and supply the necessary financial security in the form of a letter of credit or cash escrow to guarantee installation of the improvements and the conditions of final plat approval. Permits from the appropriate regulatory agencies will have to be obtained, including but not limited to the MPCA, Department of Health, MCES, and Watershed District. STREETS The developer proposes to construct a 20-foot wide private drive to serve the three proposed lots. The private drive will intersect Minnewashta Parkway at approximately the same location of the southern access point of the existing horseshoe driveway. The maximum grade of the private drive shall not exceed 10%, as shown on the plans. Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28, 2005 Page 9 The driveway easement must clearly stipulate that the owners of Lots 1-3, Block 1, Minnewashta Creek Hill shall own and maintain the private drive and the private storm sewer north of the private driveway. PARK DEDICATION The three homes proposed for Minnewashta Creek Hill will have convenient access to Roundhouse Park located less than one-half mile to the south of the property. The park is eight acres in size and features a public swimming beach, fishing pier, ice rink, warming house and shelter building, playground, basketball court, open field, picnic area, benches and trail. TRAILS A popular section of the City's comprehensive trail system is located at the front on each of the proposed lots. This trail section travels along Minnewashta Parkway from Highway 5 to Highway 7, extending to the east at Highway 7. This trail will serve as a convenient pedestrian access from the new homes to Roundhouse Park. TREE PRESERV A TION/LANDSCAPING Approximate tree canopy coverage and preservation calculations for the Minnewashta Creek Hill development as shown using a private drive are as follows: Total upland area (including outlots) 61,371 SF Total canopy area (excluding wetlands) 30,315 SF Baseline canopy coverage 50 % Minimum canopy coverage allowed 35% or 21,480 SF Proposed tree preservation 35% or 21,795 SF The developer meets the minimum canopy coverage allowed and no reforestation plantings are required. No bufferyard plantings are required along the adjoining properties since they are of equal zoning. Plantings are required along Minnewashta Parkway, but the existing trees to be preserved provide a buffer complimentary with the neighboring properties and are acceptable as bufferyard plantings. Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28,2005 Page 10 Location Required Proposed Buffer yard B- 2 overs tory trees 5 existing overstory trees Minnewashta Pkwy 4 understory trees 4 shrubs COMPLIANCE WITH ORDINANCE - PUD-R DISTRICT Lot Area Lot Width Lot Depth Home Setback Ordinance Min 11,000 90' 100' 50' front/30' rear 10' sides A vg. 15,000 BLOCK 1 Lot 1 23,474 90' 319' 50'/30' 10' 50'/30' 10' 50'/30' 10' Lot 2 20,778 92.4' 264' Lot 3 17,119 94' 222' RECOMMENDATION Staff recommends that the City Council adopt the following motion: "The City Council grants final plat approval of Planning Case #05-25 for Minnewashta Creek Hill for 3 lots and a variance to run a private street as shown on the plans received July 20, 2005, subject to the following conditions: 1. Environmental Resources Specialist Conditions: a. Tree preservation fencing shall be installed at the edge of grading limits prior to any construction. Fencing shall be maintained until construction is completed. b. Any preserved trees removed will be replaced at a rate of 2: 1 diameter inches. 2. Park and Recreation Conditions: a. In lieu of any land dedication, full park fees shall be collected at the time of platting. With the one existing home, the total park fee for Minnewashta Creek Hill will be $8,000. b. Additional trail construction is not required as a part of this project; however during demolition and construction, the existing pedestrian trail shall be protected and remain open. No construction equipment shall be parked on or use the trail as a staging area during construction. In addition, all match points encountered on the trail for demolition and/or construction shall be professionally constructed. Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28, 2005 Page 11 3. Detailed grading, drainage, tree removal and erosion control plans must be submitted with the building permit for each lot. 4. Any proposed retaining wall over four feet high requires a building permit and must be designed by a Professional Engineer registered in the State of Minnesota. 5. Tree preservation fencing must be installed at the grading limits. All disturbed areas, as a result of construction, shall be seeded and mulched or sodded immediately after grading to minimize erosion. 6. If importing or exporting material for development of the site is necessary, the applicant will be required to supply the City with a detailed haul route and traffic control plan. 7. Additional drainage and utility easements may be required based on the revised utility plan. Easements shall be minimum 20-feet wide centered over each utility. 8. According to the City's Finance Department records, the parcel was previously assessed for one sanitary sewer and water hookup, therefore sanitary sewer and water hookup charges must be paid for two lots. The 2005 trunk hookup charge is $1,458.00 for sanitary sewer and $2,955.00 for water-main. 9. Public utility improvements are required to be constructed in accordance with the City's latest edition of Standard Specifications and Detail Plates. 10. The applicant is required to enter into a development contract with the City and supply the necessary financial security in the form of a letter of credit or cash escrow to guarantee installation of the improvements and the conditions of final plat approval. 11. Permits from the appropriate regulatory agencies will have to be obtained, including but not limited to the MPCA, Department of Health, MCES, and Watershed District. 12. The driveway easement must clearly stipulate that the owners of Lots 1-3, Block 1, Minnewashta Creek Hill shall own and maintain the private drive and the private storm sewer north of the private driveway. The private street must be built to a 7-ton design, 20-foot width. The developer will be required to submit inspection reports certifying this. 13. Water Resource Coordinator Conditions: a. The estimated total SWMP fee, due payable to the City at the time of final plat recording, is $5,355. b. The applicant shall apply for and obtain permits from the appropriate regulatory agencies as necessary (e.g., Minnesota Pollution Control Agency (NPDES Phase II Construction Site Permit), (for dewatering)) and comply with their conditions of approval. Minnewashta Creek Hill Final Plat Planning Case No. 05-25 November 28, 2005 Page 12 14. Building Official Conditions: a. A final grading plan and soils report must be submitted to the Inspections Division before building permits will be issued. b. Demolition permits must be obtained prior to demolishing any structures on the site. c. Separate water and sewer services must be provided for each lot and must have a separate connection to the public sewer or to a manhole which is connected to the public sewer. d. Curb box valves cannot be located in driveways. e. Permits are required for retaining walls. Walls over four feet high must be designed by a professional engineer. f. The developer must submit a proposed name for the private drive. 15. Fire Marshal Conditions: a. The new proposed private street will need a street name. Submit name to Chanhassen Building Official and Chanhassen Fire Marshal for review and approval. b. No burning permits will be issued for trees to be removed. Trees and shrubs must either be removed from site or chipped. c. Temporary street signs shall be installed on street intersections when construction of a new roadway allows passage of vehicles. Pursuant to 2002 Minnesota Fire Code Section 501.4. d. A fire apparatus access road shall be designed and maintained to support the imposed load of fire apparatus and shall be serviced so as to provide all weather driving capabilities. Pursuant to Minnesota Fire Code Section 503.2.3." ATTACHMENTS 1. Final Plat. g:\plan\2005 planning cases\05-25 minnewashta creek hill\final plat.doc '0 ~z ""0 =0 LLO I- . :SO; o..U ....J ....J - I ~ UJ UJ ~ U <( ~ I V) <( ~ UJ Z Z - ~ ~~ z w en ~o IW z> <(- IW aU ILW 00: >- != a It') CJ CJ C"-I T""'"I C"':l J- CJ a ~~ o ~ ~ ~ o ~ z '" ::E.. 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