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1j1 Hidden Creek Meadows/Plat CITY OF CHANHASSEN 7700 Market Boulevard PO Bo, 147 Chanhassen, MN55317 Administration Phone: 952.227.1100 F,,:952.227.1110 Buiiding Inspections Phone: 952.227.11BO F,,952.227.1190 Engineering Phone: 952.227.1160 F,,952.227.1170 Finance Phone: 952.227.1140 F,,952.227.1110 Park & Recreation Phone: 952.227.1120 F,,952.227.1110 Recreation Center 2310CoullerBoulevard Phone 952.227.1400 F,,:952.227.1404 Planning & Naiurai Resources Phone 952.227.1130 F,,:952.227.1110 Public Works 1591 Park Road Phone: 952.227.1300 F,,:952.227.1310 Senior Center Phone: 952.227.1125 F,,:952.227.1110 Web Site www.cLchanhassen.mn.Us .1. '-1 ~, L I i MEMORANDUM TO: Todd Gerhardt, City Manager FROM: Bob Generous, Senior Planner .' f, DATE: June 13, 2005 ~. 1 SUBJ: Final Plat Approval for Hidden Creek Meadows Planning Case No. 04-31 PROPOSAL SUMMARY The applicant is requesting final plat approval for Hidden Creek Meadows creating 21 lots, 2 outlots and right-of-way for public streets. The proposal includes approximately 19 acres. The development complies with the Single- Family Residential (RSF) District regulations. BACKGROUND On April 25, 2005, the Chanhassen City Council approved the following: Preliminary plat approval for a subdivision with a variance for a flag lot, plans prepared by Ryan Engineering, dated August 20, 2004, revised October 14, 2004 and January 14,2005, And, Wetland Alteration Permit, plans prepared by Ryan Engineering, dated August 20, 2004, revised October 14, 2004 and January 14, 2005. FINAL PLAT PROPOSAL SUMMARY The applicant is requesting final plat approval for 21 lots, 2 outlots and associated right-of-way for public streets, Hidden Creek Meadows Addition. The developer will be donating Outlot A and Outlot B to the City for permanent open space and for storm water pond. The proposal includes approximately 19.2 acres. The City of Chanhassen . A growing community with clean lakes, quality schools, a charming downtown, thriving businesses, winding trails, arid beautiful parks. A great place to live, work, and play. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 2 PLAT LAYOUT Per Council's previous direction, the developer has to provide a public roadway easement over the northerly 43.5 feet of Lot 12, Block 2. Also, the applicant needs to show a lO-foot public drainage and utility easement along the east side of Lot 12, Block 2. All of the proposed right-of-way meets the current City standard of 60-feet wide with 60-foot cul-de-sac radii. The width and location of the proposed drainage and utility easements will be verified when final construction plans are submitted in the near future. SURFACE WATER MANAGEMENT PLAN (SWMP} 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 11.94 acres, the water quality fees associated with this project are $13,050. 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 quality 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 $32,298 for the proposed development. SWMP Credits The subdivision will be given a credit for on-site storm water quality improvements that are designed to treat runoff from the subdivision to NURP standards. The credit will be calculated using the following formula: The per acre water quality connection charge will be multiplied by the on-site drainage area for water quality treatment facilities. This value will then be multiplied by 50% (credit of $12,799). Credit will not be granted if the storm water from contributing off-site areas is already treated to NURP standards. The water quality connection charges that correspond to the land uses that contribute to the storm water ponds will be used to calculate credits. Credit will also be given for the installation of outlet control structures (credit of $2,500.00). At this time, the total SWMP fee due payable to the City at the time of final plat recording is $30,049.00. ¡' i Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 3 WETLANDS Existing Wetlands One wetland basin was delineated on December 8, 2003, by Wetland and Wildlife Consulting, Inc. The delineated wetland located along the southern portion of the property has been classified as a Type 3 wetland with Type 1 characteristics around the wetland perimeter. Vegetation within the wetland boundary included reed canary grass and river bulrush. Proposed Wetland Impacts and Mitigation Proposed impacts to the wetland include the filling of 5,756 square feet of wetland to accommodate a connection to Pipewood Lane and the installation of a 42" culvert within Hidden Creek, a DNR protected creek. Mitigation of filling activities is planned by creating 7,420 square feet of created wetland area (New Wetland Credit) and 4,317 square feet of credit for on-site storm water ponding (Public Value Credit). The applicant should create a five-year maintenance and monitoring plan for new wetland construction to ensure proposed wetland functions and values are obtained and non-native vegetation does not encroach into the mitigation area. The monitoring plan should include the preparation of annual reports as required by the Minnesota Wetland Conservation Act. Wetland Buffers Wetland buffer widths of 16.5 feet to 20.0 feet must be maintained around all wetlands on-site. All structures must maintain a 40-foot setback from the wetland buffer edge. Wetland buffers and wetland buffer setbacks should be shown on the grading plan. Wetland buffer areas should be preserved, surveyed and signed in accordance with the City's wetland ordinance. The applicant should install wetland buffer edge signs, under the direction of City staff, before construction begins and will pay the City $20 per sign. CREEK The DNR protected creek running from Lake Minnewashta to Lake Virginia flows through the site. This creek was heavily impacted during the course of the Hidden Creek Estates subdivision. The applicant should develop detailed plans (including an erosion and sediment control plan) for the installation of the culvert at Pipewood Lane. A professionally engineered temporary diversion of the stream through a stable channel during culvert installation is an acceptable alternative if winter construction is not proposed. All structures should maintain a minimum 50-foot setback from the ordinary high water level of the creek. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 4 LANDSCAPING AND TREE PRESERVATION The developer has prepared a revised landscape plan in conformance with the conditions of the preliminary plat. PARK & RECREATION Comprehensive Park Plan The proposed Hidden Creek Meadows is located very near Cathcart Park. Cathcart Park is a neighborhood park owned by the City of Shorewood, but located within the corporate boundaries of Chanhassen. Convenient access to the park is provided by the proposed sidewalk connection along Pipewood Lane connecting with Cartway Lane. No parkland dedication is recommended as a condition of this plat. Full park fees shall be collected at the rate in force at the time of final plat. Park fees for 2005 are $4,000.00 per single-family lot. Since there are currently four single-family homes within the development site, park fees will be required for 17 of the 21 lots. Comprehensive Trail Plan This property abuts the Hennepin County Regional Railroad Authority Light Rail Transit Corridor. Currently this corridor is managed by Three Rivers Park District as a regional trail with an aggregate surface. Access to the trail from Hidden Creek Meadows is provided by the proposed sidewalk connections to Pipewood Court and Cartway Lane. No additional trail construction is recommended as a condition of this plat. GRADING, DRAINAGE & EROSION CONTROL The plans propose to grade about 75% of the site for the 21 new house pads, proposed street ending with a cul-de-sac, and a storm water pond. The proposed grading will prepare the site for full basement, lookout, and walkout-type dwellings. The plan proposes a retaining wall in the back yard of Lot 7, Block 1. It appears the wall will be approximately six feet in height. The applicant should be aware that any retaining wall over 4 feet will require a building permit and must be designed by a Minnesota Registered Professional Structural Engineer. Also, the retaining wall must be 20 feet off the back of the building pad to provide adequate area for a backyard and deck. The existing site drains to a wetland along the south side of the parcel. Under developed conditions, the street, front yards and most of the house roofs and rear yard drainage will be conveyed via storm sewer to a proposed storm water pond for treatment prior to discharging to the existing wetland. The proposed development will be required to meet the existing storm water runoff rates for the 10- and 100-year, 24-hour storm events. The applicant must be aware that any existing culvert at the north side of existing Cartway Lane must be connected to the proposed storm sewer system. The applicant has done a good job of attempting to preserve the existing drainage pattern of the wetland on the site through the use of a storm sewer culvert. Where the proposed street has bisected the wetland, the culvert will act as a conduit and allow Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 5 the water to flow as it would under existing conditions. According to the City's Surface Water Management Plan (SWMP), the proposed culvert must be a minimum size of 36-inches in diameter to facilitate proper drainage through the site. The developer is proposing a 42-inch diameter culvert under the road, which exceeds the minimum size requirement. By oversizing the culvert, the developer is being conservative and helping to ensure that the drainage will flow freely through the site. Staff has received drainage calculations for the development and only minor revisions are necessary. The proposed pond is required to be designed to National Urban Runoff Program (NURP) standards. The storm sewer will have to be designed for a lO-year, 24-hour storm event. Drainage and utility easements will need to be dedicated on the final plat over the public storm drainage system including the pond, drainage swales, and wetlands up to the lOO-year flood level. The minimum utility easement width must be 20 feet wide. To help address concerns raised at the initial Public Hearing for this development, the applicant has submitted a drainage exhibit for the area in and around the development. This exhibit shows topography and critical HWL (high water level) elevations for the ponds and wetlands on the development site and upstream/downstream of the site. The HWL of the wetlands on the exhibit are from the City's SWMP plan. Most importantly, the exhibit shows the HWL of the wetland on the south side of TH 7. This wetland is upstream of the development site and was one of the areas of concern raised by the public at the last Public Hearing. The exhibit lists the HWL of the wetland as 943.4 which, based on the topography on the exhibit, is 4+ feet lower than any of the adjacent homes. In order for any of these homes to flood, the storm water in the wetland would have to rise up past elevation 948 which would also begin to flood Minnewashta Parkway. The applicant has included silt fence around the grading perimeter. Adjacent to the pond and wetlands, silt fence type II must be used. A 75-foot minimum rock construction entrance has been shown at the street entrance to the site. In addition, an erosion control blanket will be required for the steep slopes along the north property line of the site. The applicant should be aware that any off-site grading will require an easement from the appropriate property owner. All disturbed areas must be sodded or seeded and mulched within two weeks of grading completion. UTILITIES Municipal sewer and water service is available to the site from existing mains, which run along the eastern property line and from Pipewood Lane on the southwest corner of the parcel. The applicant is proposing to extend sewer and water lines along the proposed streets to service the proposed lots. The watermain will be looped through the site to avoid stagnant water issues. According to the City's Finance Department records, there is a remaining assessment balance of $25,477.05 on the parcel. This balance is required to be paid at the time of final plat recording. Since the developer will be responsible for extending lateral sewer and water mains, the sanitary sewer and water connection charges will be waived. However, the sanitary sewer and water hookup charges will still be applicable for each lot. The 2005 trunk hookup charge is $1,458 for Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 6 sanitary sewer and $2,955 for watermain. Each of these charges is based on the number of SAC units calculated by the Metropolitan Council. Sanitary sewer and watermain hookup fees may be specially assessed against the parcel at the time of building permit issuance. 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 the time of final plat for staff review. The applicant is required to finance all of the proposed improvements. The applicant will also be required to enter into a development contract with the City and to 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 must be obtained, including but not limited to the Watershed District, MPCA, Department of Health, MnDOT, etc. STREETS The plans propose to extend Pipewood Lane, as the main road, approximately 1,300 feet within the site. The public streets are shown within a 60-foot right-of-way, as per City ordinance along with street pavement widths of 31-feet back-to-back and a 45.5-foot radius on the cul-de-sac. Due to the long length of the proposed cul-de-sac and the practice of having two connections int%ut of developments, staff is recommending that the existing gravel road known as Cartway Lane be connected to the proposed cul-de-sac at the eastern border of the site. This will be an interim connection until the properties to the north develop and Cartway Lane is vacated. COMPLIANCE TABLE Area (square feet) Frontage (feet) Depth (feet) Setbacks (feet): front, side, rear, wetland (from buffer edJ!:e) Code 15,000 90 125 30, 10, 30, 40 Lot 1, Block One 25,406 92 192 30, 10, 30, 40 Lot 2 15,908 95 167 30,10, 30, na Lot 3 15,915 95 167 30,10,30,na Lot 4 15,924 95 167 30, 10, 30, na Lot 5 16,014 95 169 30, 10, 30, na Lot 6 17,518 137 155 30, 10, 30, na Lot 7 15,307 94 142 30,10,30, na Lot 8 39,246 56@ 164 30, 10, 30, na Lot 9 15,064 170 144 30, 10, 30, na Lot 1, Block Two 20,803 141 172 30, 10, 30, 40 Lot 2 17,593 97 180 30, 10, 30, 40 Lot 3 17,603 97 191 30, 10, 30, na Lot 4 15,694 100 200 30, 10, 30, na Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 7 Area (square feet) Frontage (feet) Depth (feet) Setbacks (feet): front, side, rear, wetland (from buffer edge) LotS 16,609 100 214 30, 10, 30, na Lot 6 17,266 100 227 30, 10, 30, na Lot 7 21,761 97 230 30,10,30,40 Lot 8 22,331 97 230 30,10,30,40 Lot 9 24,173 105 230 30, 10, na, 40 Lot 10 22,999 100 230 30, 10, na, 40 Lot 11 18,850 133 204 30, 10, 30, 40 Lot 12 34,019 # 30& 270 30, 10, 30, 40 Outlot A 279,972 Outlot B 37,872 ROW 87,384 Total 832,129 @ Meets 90 feet width at the 30-foot building setback line. & Meets the loo-foot lot width at the flag. # Excludes 6,940 square feet located in the lot neck. REVIEW OF CONDITIONS OF APPRO V AL 1. A final grading plan and soils report must be submitted to the Inspections Division before building permits will be issued. * This condition still applies. 2. Demolition permits must be obtained prior to demolishing any structures on the site. * This condition still applies. 3. Separate sewer and water services must be provided to each lot. * This condition still applies. 4. Retaining walls more than four feet high must be designed by a registered structural engineer and a building permit must be obtained prior to construction. * This condition still applies. 5. The sauna on Outlot B must be removed. __.1 Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 8 * This condition still applies. 6. Outlots A and B shall be dedicated to the City. * This condition stil\ applies. 7. No burning permits will be issued for trees to be removed. Trees and shrubs must either be removed from the site or chipped. * This condition still applies. 8. Fire apparatus access roads and water supply for fire protection is required to be installed. Such protection shall be installed and made serviceable prior to and during the time of construction except when approved alternate methods of protection are provided. Temporary street signs shall be installed on each street intersection when construction of new roadways allows passage by vehicles. Pursuant to 2002 Minnesota Fire Code Section 501.4. * This condition stil\ applies. 9. A 20-foot clear space must be maintained around fire hydrants, i.e., street lamps, trees, shrubs, bushes, Xcel Energy, Qwest, cable TV and transformer boxes. This is to ensure fire hydrants can be quickly located and safely operated by firefighters. Pursuant to Chanhassen City Ordinance #9-1. * This condition still applies. 10. Full park fees shall be collected at the rate in force at the time of final plat for 17 single- family residential lots. * This condition shall be modified as follows: Park fees totaling $68,000.00 shall be paid to the city prior to recording the final plat. 11. The grading on Lots 10-12, Block 2 shall be revised to avoid grading within the wetland. * This condition has been met. 12. The applicant shall create a five-year maintenance and monitoring plan for new wetland construction to ensure proposed wetland functions and values are obtained and non-native vegetation does not encroach into the mitigation area. The monitoring plan shall include the preparation of annual reports as required by the Minnesota Wetland Conservation Act. * This condition still applies. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 9 13. Wetland buffer widths of 16.5 feet to 20.0 feet shall be maintained around all wetlands on- site. All structures shall maintain a 40-foot setback from the wetland buffer edge. Wetland buffers and wetland buffer setbacks shall be shown on the grading plan. Wetland buffer areas shall be preserved, surveyed and signed in accordance with the City's wetland ordinance. The applicant shall install wetland buffer edge signs, under the direction of City staff, before construction begins and will pay the City $20 per sign. * This condition still applies. 14. The applicant shall develop detailed plans (including an erosion and sediment control plan) for the installation of the culvert at Pipewood Lane. A winter installation of this culvert is preferable. A professionally engineered temporary diversion of the stream through a stable channel during culvert installation is an acceptable alternative. * This condition still applies. 15. The applicant shall demonstrate that the installation of the 42" proposed culvert at Pipewood Lane will not cause water to back up through the existing 4' by 6' culvert under Highway 7 to the south side of Highway 7 in 10- and loo-year storms. * This condition still applies. 16. All structures shall maintain a minimum 50-foot setback from the ordinary high water level of the creek. * This condition still applies. 17. The applicant shall submit calculations to ensure that the pond is sufficient to provide water quality treatment to NURP standards for storm water from the development. * This condition has been met. 18. The proposed storm water pond shall be designed to accommodate storm water from the upstream areas of the MC-A2.6 subwatershed. * This condition has been met. 19. 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: Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 10 Type of Slope Time (maximum time an area can remain unvegetated when area is not activelv beinl! worked) Steeuer than 3: 1 7 Davs 10:1 to 3:1 14 Days Flatter than 10: 1 21 Davs These areas include constructed storm water management pond side slopes, 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 manmade systems that discharge to a surface water. * This condition still applies. 20. Daily scraping and sweeping of public streets shall be completed anytime construction site soil, mud, silt or rock is tracked or washed onto paved surfaces or streets that would allow tracked materials or residuals of that material to enter the storm water conveyance system. * This condition still applies. 21. At this time, the estimated total SWMP fee due payable to the City at the time of final plat recording is $45,348. * This condition shall be modified as follows: The total SWMP fee due payable to the City at the time of final plat recording is $30,049.00. 22. The applicant shall apply for and obtain permits from the appropriate regulatory agencies (e.g., Minnehaha Creek Watershed District, Minnesota Pollution Control Agency, United States Army Corps of Engineers) and comply with their conditions of approval. * This condition still applies. 23. Prior to final plat approval, a professional civil engineer registered in the State of Minnesota must sign all plans. * This condition still applies. 24. Prior to final platting, storm sewer design data with a drainage map will need to be submitted for staff review. The storm sewer will have to be designed for a lO-year, 24-hour storm event. The pond is required to be designed to National Urban Runoff Program (NURP) standards. Drainage and utility easements will need to be dedicated on the final plat over the public storm drainage system including ponds, drainage swales, and wetlands up to the 100-year flood level. The minimum utility easement width shall be 20 feet wide. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 11 * This condition still applies. 25. Type II silt fence must be used adjacent to all ponds and wetlands. In addition, an erosion control blanket is required for the steep slopes along the north property line of the site. The applicant should be aware that any off-site grading would require an easement from the appropriate property owner. * This condition still applies. 26. The remaining utility assessment due payable to the City at the time of final plat recording is $25,477 .05. In addition, the sanitary sewer and water hookup charges will be applicable for each of the new lots. The 2005 trunk utility hookup charges are $1,458 per unit for sanitary sewer and $2,955 per unit for water. Each of these charges is based on the number of SAC units calculated by the Metropolitan Council. * This condition still applies. 27. Public utility improvements wiII be required to be constructed in accordance with the City's latest editions of Standard Specifications and Detail Plates. Detailed construction plans and specifications wiII be required at the time of final platting. The applicant wiII also be 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 must be obtained, including but not limited to the MPCA, MNDOT, Department of Health, etc. * This condition still applies. 28. Show all of the existing and proposed easements on the plans. * This condition stilI applies. 29. Show all ofthe existing utilities on the plans. * This condition still applies. 30. The proposed development is required to meet the existing storm water runoff rates for the 10- and 100-year, 24-hour storm events. * This condition has been met. 31. The walk-out elevation of the proposed homes must be a minimum of 3 feet higher than the adjacent pond or wetland high-water-Ievel. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 12 * This condition has been met. 32. Show the proposed storm manhole rim and invert elevations on the utility plan. * This condition has been met. 33. Show all emergency overflow elevations on the grading plan. * This condition stilI applies. 34. The existing temporary pavement turnaround for Pipewood Lane just south of this site must be removed when Pipewood Lane is extended. Any disturbed area must be sodded and restored. * This condition still applies. 35. The retaining wall in the rear yard of Lot 7, Block 1 must be 20 feet off the back of the building pad. * This condition has been met. 36. Revise the rear yard grading of Lot 9, Block 1 to prevent trapping water behind the curb. Either a catch basin will need to be added or the area will have to be re-graded with a minimum slope of 2% to drain from the rear yard to the street. * This condition has been met. 37. The existing gravel road known as Cartway Lane must be connected to the proposed cul-de- sac at the eastern border of the site. * This condition still applies. 38. The existing culvert across the street from Lot 9, Block 2 shalI be connected to the storm sewer for Pipewood Lane. * This condition still applies. 39. A minimum of two overstory trees shall be required in the front yard setback area of each lot. * This condition still applies. 40. Tree protection fencing is required around all trees proposed to be saved. Any tree lost will be replaced at a rate of 2: 1 diameter inches. * This condition still applies. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 13 41. The applicant shaH confIrm the tree canopy coverage and preservation calculations. A total of 193 trees will be required to be planted unless otherwise noted. * This condition has been met. 42. The following trees are required on each lot as shown on the landscape plan dated 1/14/05: Lot Front vard Rear vard Lot 1, Block 1 2 6 Lot 2, Block 1 2 3 Lot 3, Block 1 2 3 Lot 4, Block 1 2 3 Lot 5, Block 1 2 3 Lot 6, Block 1 2 4 Lot 7, Block 1 2 5 Lot 8, Block 1 2 6 Lot 9, Block 1 2 2 Lot 1, Block 2 2 4, 3 side yard Lot 2, Block 2 2 2 Lot 3, Block 2 2 4 Lot 4, Block 2 2 2 Lot 5, Block 2 2 2 Lot 6, Block 2 2 2 Lot 7, Block 2 2 4 Lot 8, Block 2 2 3 Lot 9, Block 2 2 4 Lot 10, Block 2 4 2 Lot 11, Block 2 5 2 Lot 12, Block 2 1 2 Outlot A 30 (buffer plantings included in total) Outlot B 9 * This condition shall be modified as foHows: Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 14 The following trees are required on each lot as shown on the landscape plan dated OS/23/05: Lot Front vard Rear vard Lot 1, Block 1 2 9 Lot 2, Block 1 2 4 Lot 3, Block 1 2 6 Lot 4, Block 1 2 4 Lot 5, Block 1 2 4 Lot 6, Block 1 2 4 Lot 7, Block 1 2 5 Lot 8, Block 1 2 8 Lot 9, Block 1 2 5 Lot 1, Block 2 2 6 Lot 2, Block 2 2 4 Lot 3, Block 2 2 4 Lot 4, Block 2 2 2 Lot 5, Block 2 2 2 Lot 6, Block 2 2 2 Lot 7, Block 2 2 4 Lot 8, Block 2 2 4 Lot 9, Block 2 2 5 Lot 10, Block 2 4 2 Lot 11, Block 2 4 2 Lot 12, Block 2 5 2 Outlot A 22 (buffer vlantin!!s included in total) Outlot B 9 43. A landscape plan with a plant schedule that specifies the proposed quantities of each species shall be submitted to the city prior to final plat approval. * This condition has been met. 44. The developer shall be responsible for planting any trees located in the rear or side yards as shown on the landscape plan dated 1/14/05. This condition shall be modified as follows: The developer shall be responsible for planting any trees located in the rear or side yards as shown on the landscape plan dated OS/23/05. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 15 45. The applicant shall plant only species adaptable to wet sites near the wetland boundary edge. * This condition has been met. 46. Tree preservation fencing shall be installed at the dripline of the tree saved on Lot 6, Block 2 prior to any grading. * This condition still applies. 47. Any plantings occurring on Outlots A or B be field located and no existing vegetation shall be removed or compromised for the planting of new trees. * This condition still applies. 48. The applicant shall install landscaping at the end of the Pipewood Lane and along the east boundary of Lot 12, Block 2 around the cul-de-sac. Evergreens and omamentals shall be installed so as to reduce headlight glare and buffer views of the street from the existing homes. A minimum of 9 evergreens and 3 ornamentals shall be planted along the cul-de-sac and along the east side of the flag lot maintaining planting density of the cul-de-sac along the east border. * This condition has been met. 49. The applicant shall remove Colorado blue spruce from the plant schedule and replace it with white fir or a species of pine. * This condition has been met. 50. The grading limits shown on the grading plan for Lot 2, Block 2, shall remain as is and the developer shall adapt to the existing plan as necessary to preserve a small group of maples 12" and larger. * This condition still applies. 51. Temporary rock fords should not be used; and crossing the stream with flowing water and no established stable crossing must be avoided. No work shall take place in the creek between the dates of March 15th to June 15th to minimize sediment impacts to spawning fish species. * This condition still applies. 52. MN DOT category 3 erosion blanket and seed should be applied to exposed creek slopes near/around Pipewood Lane within 24 hours of final grade. * This condition still applies. " j Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 16 53. Following stormwater inlet installation Wimco-type (or equal) inlet sediment controls should be installed and regularly maintained. * This condition still applies. 54. Following street and utility installation, Chanhassen-specification Type I silt fence or other approved perimeter sediment control is needed for all positive slopes curbside. * This condition still applies. 55. The silt fence proposed across the existing and proposed Pipewood Lane is not practical due to site access needs. * This condition has been met. 56. The applicant will work with staff to resolve the access issues on Cartway Lane. * This condition has been met. 57. The cul-de-sac right-of-way shall be shifted to the west 10 feet and the neck for Lot 12 shall be extended along the east side of the cul-de-sac to provide area outside of the right-of-way for the recommended landscaping. A public easement for drainage, roadway, and utility purposes must be dedicated over the northern 43.5 feet of Lot 12, Block 2. This condition shall be modified as follows: Show a lO-foot drainage and utility easement along the east lot line of Lot 12, Block 2. A public easement for roadway purposes shall be dedicated over the northern 43.5 feet of Lot 12, Block 2. In addition, based on the review of the final plat and construction documents, staff recommends that the following conditions be added: The lot dimension data for the front lot line of Lot 8, Block 1, shall be added to the plat. Submit storm sewer design data with a drainage map for staff review. Approval of the final plat is contingent upon approval of final construction plans/specifications for the project along with the developer entering into a development contract with the City and supplying the necessary financial security and fees. Submit the project utilities and public improvement specifications book for staff review. Show the proposed street lights per City standards at every 300 ft. along the proposed street. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 17 RECOMMENDATION Staff recommends that the City Council adopt the following motion: 'The Chanhassen City Council approves the Final Plat for Hidden Creek Meadows creating 21 lots, 2 outlots and associated right-of-way for public streets (plans prepared by Ryan Engineering, dated OS/23/05) subject to the following conditions: 1. A final grading plan and soils report must be submitted to the Inspections Division before building permits will be issued. 2. Demolition permits must be obtained prior to demolishing any structures on the site. 3. Separate sewer and water services must be provided each lot. 4. Retaining walls more than four feet high must be designed by a registered structural engineer and a building permit must be obtained prior to construction. 5. The sauna on Outlot B must be removed. 6. Outlots A and B shall be dedicated to the City. 7. No burning permits will be issued for trees to be removed. Trees and shrubs must either be removed from site or chipped. 8. Fire apparatus access roads and water supply for fire protection is required to be installed. Such protection shall be installed and made serviceable prior to and during the time of construction except when approved alternate methods of protection are provided. Temporary street signs shall be installed on each street intersection when construction of new roadways allows passage by vehicles. Pursuant to 2002 Minnesota Fire Code Section 501.4. 9. A 20-foot clear space must be maintained around fire hydrants, i.e., street lamps, trees, shrubs, bushes, Xcel Energy, Qwest, cable TV and transformer boxes. This is to ensure fire hydrants can be quickly located and safely operated by firefighters. Pursuant to Chanhassen City Ordinance #9-1. 10. Park fees totaling $68,000.00 shall be paid to the city prior to recording the final plat. 11. The applicant shall create a five-year maintenance and monitoring plan for new wetland construction to ensure proposed wetland functions and values are obtained and non-native vegetation does not encroach into the mitigation area. The monitoring plan shall include the preparation of annual reports as required by the Minnesota Wetland Conservation Act. 12. Wetland buffer widths of 16.5 feet to 20.0 feet shall be maintained around all wetlands on- site. All structures shall maintain a 40-foot setback from the wetland buffer edge. Wetland Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 18 buffers and wetland buffer setbacks shall be shown on the grading plan. Wetland buffer areas shall be preserved, surveyed and signed in accordance with the City's wetland ordinance. The applicant shall install wetland buffer edge signs, under the direction of City staff, before construction begins and will pay the City $20 per sign. 13. The applicant shall develop detailed plans (including an erosion and sediment control plan) for the installation of the culvert at Pipewood Lane. A winter installation of this culvert is preferable. A professionally engineered temporary diversion of the stream through a stable channel during culvert installation is an acceptable alternative. 14. The applicant shall demonstrate that the installation of the 42" proposed culvert at Pipewood Lane will not cause water to back up through the existing 4' by 6' culvert under Highway 7 to the south side of Highway 7 in 10- and lOO-year storms. 15. All structures shall maintain a minimum 50-foot setback from the ordinary high water level of the creek. 16. 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: 17. Type of Slope 18. Time 19. (maximum time an area can remain unvegetated 20. (when area is not activelv heln.. worked) 21. Steeper than 3: 1 22. 7 Days 23. 10:1 to 3:1 24. 14 Davs 25. Flatterthan 10: 1 26.21 Davs These areas include constructed storm water management pond side slopes, 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 manmade systems that discharge to a surface water. 17. Daily scraping and sweeping of public streets shall be completed anytime construction site soil, mud, silt or rock is tracked or washed onto paved surfaces or streets that would allow tracked materials or residuals of that material to enter the storm water conveyance system. 18. The total SWMP fee due payable to the City at the time of final plat recording is $30,049.00. 19. The applicant shall apply for and obtain permits from the appropriate regulatory agencies (e.g., Minnehaha Creek Watershed District, Minnesota Pollution Control Agency, United States Army Corps of Engineers) and comply with their conditions of approval. 20. Prior to final plat approval, a professional civil engineer registered in the State of Minnesota must sign all plans. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 19 21. Prior to final platting, storm sewer design data with a drainage map will need to be submitted for staff review. The storm sewer will have to be designed for a lO-year, 24-hour storm event. The pond is required to be designed to National Urban Runoff Program (NURP) standards. Drainage and utility easements will need to be dedicated on the final plat over the public storm drainage system including ponds, drainage swales, and wetlands up to the 100- year flood level. The minimum utility easement width shall be 20 feet wide. 22. Type II silt fence must be used adjacent to all ponds and wetlands. In addition, an erosion control blanket is required for the steep slopes along the north property line of the site. The applicant should be aware that any off-site grading would require an easement from the appropriate property owner. 23. The remaining utility assessment due payable to the City at the time of final plat recording is $25,477 .05. In addition, the sanitary sewer and water hookup charges will be applicable for each of the new lots. The 2005 trunk utility hookup charges are $1,458 per unit for sanitary sewer and $2,955 per unit for water. Each of these charges is based on the number of SAC units calculated by the Metropolitan Council. 24. Public utility improvements will be required to be constructed in accordance with the City's latest editions of Standard Specifications and Detail Plates. Detailed construction plans and specifications will be required at the time of final platting. The applicant will also be 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 must be obtained, including but not limited to the MPCA, MNDOT, Department of Health, etc. 25. Show all of the existing and proposed easements on the plans. 26. Show all of the existing utilities on the plans. 27. Show all emergency overflow elevations on the grading plan. 28. The existing temporary pavement turnaround for Pipewood Lane just south of this site must be removed when Pipewood Lane is extended. Any disturbed area must be sodded and restored. 29. The existing gravel road known as Cartway Lane must be connected to the proposed cul-de- sac at the eastern border of the site. 30. The existing culvert across the street from Lot 9, Block 2 shall be connected to the storm sewer for Pipewood Lane. 31. A minimum of two overstory trees shall be required in the front yard setback area of each lot. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 20 32. Tree protection fencing is required around all trees proposed to be saved. Any tree lost will be replaced at a rate of 2: 1 diameter inches. 33. The following trees are required on each lot as shown on the landscape plan dated OS/23/05: Lot Front vard Rear vard Lot 1, Block 1 2 9 Lot 2, Block 1 2 4 Lot 3, Block 1 2 6 Lot 4, Block 1 2 4 Lot 5, Block 1 2 4 Lot 6, Block 1 2 4 Lot 7, Block 1 2 5 Lot 8, Block 1 2 8 Lot 9, Block 1 2 5 Lot 1, Block 2 2 6 Lot 2, Block 2 2 4 Lot 3, Block 2 2 4 Lot 4, Block 2 2 2 Lot 5, Block 2 2 2 Lot 6, Block 2 2 2 Lot 7, Block 2 2 4 Lot 8, Block 2 2 4 Lot 9, Block 2 2 5 Lot 10, Block 2 4 2 Lot 11, Block 2 4 2 Lot 12, Block 2 5 2 Outlot A 22 (buffer olantings included in total) Outlot B 9 34. The developer shaH be responsible for planting any trees located in the rear or side yards as shown on the landscape plan dated OS/23/05. 35. Tree preservation fencing shall be installed at the dripline of the tree saved on Lot 6, Block 2 prior to any grading. 36. Any plantings occurring on Outlots A or B be field located and no existing vegetation shall be removed or compromised for the planting of new trees. Final Plat - Hidden Creek Meadows Addition Planning Case 04-31 June 13, 2005 Page 21 37. The grading limits shown on the grading plan for Lot 2, Block 2, shall remain as is and the developer shall adapt to the existing plan as necessary to preserve a small group of maples 12" and larger. 38. Temporary rock fords should not be used; and crossing the stream with flowing water and no established stable crossing must be avoided. No work shall take place in the creek between the dates of March 15th to June 15th to minimize sediment impacts to spawning fish species. 39. MN DOT category 3 erosion blanket and seed should be applied to exposed creek slopes near/around Pipewood Lane within 24 hours of final grade. 40. Following storm water inlet installation, Wimco-type (or equal) inlet sediment controls should be installed and regularly maintained. 41. Following street and utility installation, Chanhassen-specification Type I silt fence or other approved perimeter sediment control is needed for all positive slopes curbside. 42. Show a lO-foot drainage and utility easement along the east lot line of Lot 12, Block 2. A public easement for roadway purposes shall be dedicated over the northern 43.5 feet of Lot 12, Block 2. 43. The lot dimension data for the front lot line of Lot 8, Block 1, shall be added to the plat. 44. Submit storm sewer design data with a drainage map for staff review. 45. Approval of the final plat is contingent upon approval of final construction plans/specifications for the project along with the developer entering into a development contract with the City and supplying the necessary financial security and fees. 46. Submit the project utilities and public improvement specifications book for staff review. 47. Show the proposed street lights per City standards at every 3OO-foot along the proposed street." 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