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E-7a. Boulder Cove Final Plat Apprpovaln� 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 7901 Park Place Phone: 952.227.1300 Fax: 952.227.1310 Senior Center Phone: 952.227.1125 Fax: 952.227.1110 Web Site www.ci.chaphassen.mn.us MEMORANDUM TO: Todd Gerhardt, City Manager FROM: Sharmeen Al -Jaff, Senior Planner DATE: June 9, 2012 SUBJ: Boulder Cove Final Plat Approval — Planning Case 2014 -09 PROPOSED MOTION "The Chanhassen City Council grants approval of the final plat for Boulder Cove as shown in plans dated received May 22, 2014 and subject to the conditions of approval in the staff report." Approval requires a simple majority vote of City Council present. PROPOSAL SUMMARY Preliminary Plat with Variances to Subdivide 13.38 Acres into 30 lots and 4 outlots, Boulder Cove, located north of Highway 7, east of Church Road and south of West 62" Street. On April 14, 2014, the Chanhassen City Council adopted the following motion: "The City Council approves the Preliminary Plat for Planning Case #2014 -09 for Boulder Cove for 31 I ots and 3 outlots with a Vari ance to allow a 1,200 -foot long cul -de -sac as shown on the plans received March 4, 2014, subject to the following conditions and adoption of the attached Findings of Fact: 7� 1. Park and Recreation Conditions: a. Full park fees in lieu of additional parkland dedication and/or trail construction shall be collected as a condition of approval for Boulder Cove. The park fees will be collected in full at the rate in force upon final plat submission and approval. Based upon the current proposed lot count of 31 homes and the city's 2014 single - family park fee of $5,800 per unit, the total park fees for Boulder Cove would be $179,800. Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 2 of 25 Finding: This condition has been modified as follows: Full park fees in lieu of additional parkland dedication and/or trail construction shall be collected as a condition of approval for Boulder Cove. The park fees will be collected in full at the rate in force upon Final plat submission and approval. Based upon the current proposed lot count of 30 homes and the city's 2014 single -family park fee of $5,800 per unit, the total park fees for Boulder Cove would be $174,000. 2. Environmental Resources Conditions: a. Tree preservation fence shall be installed at the edge of the drip line for tree #71. A layer of woodchips shall be installed over the root zone to a depth of 3 -4 inches. All other tree preservation fencing shall be installed at the edge of the grading limits prior to any construction. Finding: This condition still applies. b. No trees shall be planted within the public right -of -way. Front yard trees shall be located inside the setback area. Finding: This condition has been met. c. Additional tree species shall be added to the plant schedule in order to reduce the percentage attributed to spruce so that no more than one -third of the trees are from any one species. Additional trees may not be from the maple family and must be overstory species. Minimum total number of trees to be planted is 166. Finding: This condition has been modified as follows: Additional tree species shall be added to the plant schedule so that no more than 10% of the trees are from any one species and no more than 20% are from any one genus. Additional trees must be overstory species. The minimum number of trees to be planted is 177. A revised landscape plan must be submitted and approved by the city prior to any grading. d. There are overhead power lines along Highway 7. Only ornamental trees shall be allowed to be planted in the bufferyard between the property line and the proposed fence. Finding: This condition has been met. e. Evergreens shall average seven feet in height when planted. Finding: This condition still applies. f. Any tree removal outside the parameters of the subject property shall require approval of the property owner where the tree is located. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 3 of 25 Finding: This condition has been met. g. Applicant shall correct the tree inventory for the following trees: • Tree #38, sugar maple: shown on the plan as saved, shown in the inventory as removed. The applicant shall resolve the discrepancy. Finding: This condition has been met. • Tree #72, spruce: shown on plan and inventory as saved. Tree is noted to be in poor condition. Tree shall be noted as REMOVE. Finding: This condition has been met. Tree #96, red oak: shown on plan at the very edge of the grading limits. Tree appears to be in a position for a possible save. It is in fair condition. Staff recommends that applicant work with staff to preserve tree if appropriate. Finding: This condition still applies. • Tree #205, #206, ash: shown on plans as saved. These trees are within the grading limits and have proposed grading shown on top of their locations. Trees shall be noted as REMOVE. Finding: This condition still applies. 3. Building Department conditions: a. Final grading plans and soil reports must be submitted to the Inspections Division before building permits will be issued. Finding: This condition still applies. b. Engineered design and building permits are required for retaining walls exceeding four feet in height. Finding: This condition still applies. c. Each lot must be provided with a separate sewer and water service. Finding: This condition still applies. d. Demolition permits must be obtained before demolishing any structures. Finding: This condition still applies. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 4 of 25 e. Proper removal, abandonment or sealing of storage tanks, on -site septic systems, wells, etc. required. Permits required, as applicable. Finding: This condition still applies. f. If applicable, existing home(s) affected by new street will require address changes. Finding: This condition still applies. 4. Fire Marshal conditions: a. Three feet of clear space must be maintained around fire hydrants. Finding: This condition still applies. b. Fire hydrants must be made serviceable prior to combustible construction. Finding: This condition still applies. c. Temporary street signs shall be installed prior to and during construction. Finding: This condition still applies. d. Fire apparatus access roads capable of supporting the weight of fire apparatus shall be made serviceable prior to combustible construction. Finding: This condition still applies. e. No burning permits will be issued for the removal of brush, trees. Finding: This condition still applies. 5. Planning Department Conditions: a. Any plans showing or describing "Next Generation" homes should not be included because they are not permitted under current city ordinances. Finding: This condition still applies. b. A high- tension power line exists along Highway 7. Any work or landscaping must be approved by Xcel Energy. Finding: This condition still applies. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 5 of 25 6. Engineering Department Conditions: a. The developer must work with the City of Chanhassen and the City of Shorewood to revise the plans to incorporate a "T" intersection at 62 "a Street, Strawberry Lane, and Boulder Court. Finding: This condition has been met. b. The developer shall provide an analysis to determine if the "T" intersection would warrant a stop condition. Finding: This condition has been met. c. If a stop condition is warranted the developer shall have a traffic engineer collect and analyze traffic counts on 62 "a Street to determine the queuing effects at the intersection. Finding: This condition no longer applies. d. Other details such as transitioning from a 31 -foot wide street in Chanhassen to a 22 -foot wide street in Shorewood shall be addressed with the final plan submittal. Finding: This condition has been met. e. The developer is required to obtain any necessary permits from the Metropolitan Council (sewer connection permit) and the City of Shorewood (work in right of way permit) and the street must be restored. Finding: This condition is modified as follows: Before construction can begin the developer is required to obtain any necessary permits from the Metropolitan Council (sewer connection permit) and the City of Shorewood (work in right of way permit). f. The septic tank and mound system that services 3530 Highway 7 is within the project boundaries. These items must be removed and disposed of at an approved facility in conjunction with the site improvements as proposed. Finding: This condition still applies. g. Based on the proposed preliminary plan the developer must provide a sanitary sewer service to 3530 Highway 7. The developer shall ensure that sewer service to 3530 Highway 7 is maintained throughout construction, which will involve pumping the septic tank after the septic mound is removed and before a sewer service is installed to serve the property. Finding: This condition no longer applies. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 6 of 25 h. Water main for the project will be directionally bored under Highway 7 and will wet tap into the existing 12" trunk water main on the south side of Highway 7. A portion of this water main extension lies on 3520 Highway 7; the developer must acquire the necessary easement prior to final plat submittal. The easement must be 20 feet wide centered on the pipe. Finding: This condition no longer applies. i. Water main will extend between Lot 5, Block 1 and the tot lot to the existing water main in the southwest corner of 3751 62nd Street. The water main alignment shown on the utility plan is not within existing easement, therefore the developer must acquire the easement necessary to install this water main prior to final plat submittal. The easement must be 20 feet wide centered on the pipe. Finding: This condition no longer applies. j. A water main interconnect will be required to the Shorewood watennain at 62n1 Street and Strawberry Lane. Finding: This condition has been met. k. The developer proposes to extend 6" water main to the east to provide service to 3520 and 3030 Highway 7. The developer must acquire the necessary easements to complete this work. Finding: This condition no longer applies. 1. All existing and proposed off -site drainage and utility easements must be referenced accordingly. Finding: This condition still applies. m. Existing off -site easements must be referenced by document number or the plat in which they were dedicated. Finding: This condition still applies. n. 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. Finding: This condition still applies. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 7 of 25 7. Water Resources Coordinator Conditions: a. Show the extent of the shoreland overlay district for Lake Minnewashta on the plan set before final plat approval. Finding: This condition has been met. b. The applicant must demonstrate the extent of tree preservation for storm water volume reduction credit by overlaying grading limits on a current aerial photograph before final plat approval. Finding: This condition has been met. c. The applicant must recalculate the volume reduction credit from new tree plantings without the use of ornamental trees before final plat approval. The current best information is that elevation is at least 969.5 to approximately 972. Finding: This condition has been met. d. The filtration feature shall be moved so that the bounce within the basin remains entirely within the outlot before final plat approval. Finding: This condition has been met. e. A homeowners association shall be created and shall be responsible for the maintenance of the filtration feature. The outlet pipe shall be the responsibility of the city. Finding: This condition still applies. f. An operations and maintenance manual shall be developed for the filtration feature indicating how the HOA will maintain the feature and assure its proper function. Finding: This condition still applies. g. The landscape plan shall be updated to include the planting schedule for the infiltration basin and the outlots and to provide shrubs or other buffering measures between the rear yard lines and the filtration feature before final plat approval. Finding: This condition has been met. h. The pond in Outlot A shall be redesigned such that the likely seasonally high water table is at or below the modeled normal water level. Finding: This condition has been met. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 8 of 25 i. Additional hydrogeological data provided and attested to by a licensed professional in hydrogeology or similar may be used to show that the above condition 8 is met. Finding: This condition no longer applies. All recommendations relating to subgrade improvements, preparations and drainage as well as dewatering and drainage control from the March 3, 2014 Braun report shall be implemented. Finding: This condition still applies. k. The swale behind lots 4 through 10 of Block 2 shall have a drain tile installed as part of the site grading and utility installation. This shall be included before final plat approval. Finding: This condition still applies. 1. Environmental manholes or 4 -foot sump manholes with SAFL baffles shall be installed at CBMHI and CBMH3. Finding: Amended as follows: Environmental manholes or 4 -foot sump manholes with SAFL baffles shall be installed at CBM112 and CBMH4. m. A concerted efforts shall be made to combine the outfall into the Pond in outlot A such that there is only one outfall. If it is not feasible from an engineering standpoint, then documentation supporting this assertion shall be provided to city staff prior to final plat approval. Finding: This condition has been met. n. A comprehensive, stand -alone SWPPP document with all elements required by Part III of the NPDES construction permit shall be prepared and submitted to the City for review and comment before final plat approval. Finding: This condition still applies. o. Surface Water Management connection charges are estimated to be $84,146.45. This connection charge will be due at the time of final plat. Finding: This condition has been amended as follows: The Surface Water Management connection charges are $82,967.65. p. In the event that wetland characteristics are observed on the site during field visits during the growing season, steps will need to be taken to assure compliance with the MN Wetland Conservation Act, the Federal Clean Water Act and other applicable federal, state and local regulations. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 9 of 25 Finding: This condition still applies. The final plat contained 31 lots and 3 outlots. To meet the conditions of approval, the total number of lots was reduced to 30 lots and the outlots were increased to 4. FINAL PLAT The applicant is requesting final plat approval to subdivide 13.38 acres into 30 lots and 4 outlots. The site is zoned RLM, Residential Low and Medium Density District and is located north of Highway 7, east of Church Road and south of West 62" d Street. The density is 2.2 units per acre gross and 3.9 units per acre net after removing the roads, storm ponds and park. The applicant is proposing to develop the site in one phase. Outlot A contains a drainage easement and a storm pond, Outlot B is an open space and will contain a future development sign, Outlot C contains a drainage easement and a filtration basin and Outlot D contains a filtration basin and a tot lot. All lots meet the minimum area, width and depth of the zoning ordinance requirements. All lots are proposed to contain single- family homes. The applicant submitted several home designs they intend to build. One of these designs (Next Generation) is a two -unit home. Staff discussed this matter with the applicant and informed them that the city code requires a variance for the temporary use of single - family dwelling as a two- family dwelling under the following circumstances: 1. There is a demonstrated need based upon disability, age or financial hardship. 2. The dwelling has the exterior appearance of a single - family dwelling, including the maintenance of one driveway and one main entry. 3. Separate utility services are not established (e.g., gas, water, sewer, etc.). Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 10 of 25 4. The variance will not be injurious to or adversely affect the health, safety or welfare of the residents of the city or the neighborhood where the property is situated and will be in keeping with the spirit and intent of this chapter. A condition of the plat approval states "Any plans showing or describing `Next Generation' homes should not be included because they are not permitted under current city ordinances." This condition still applies to the plat. Access is gained off of an internal road. There is a variance attached to the application that deals with the length of the cul -de -sac serving this development. This variance was approved with the preliminary plat. All of the proposed lots meet the minimum width and depth requirements of the Zoning Ordinance. Staff notes that the proposal is consistent with the Comprehensive Plan and generally consistent with the Zoning Ordinance. Streets The developer proposes to extend a 1,200 -foot long public cul -de -sac from the existing intersection of West 62nd Street and Strawberry Lane. Staff supports the variance for the cul -de- sac length due to the safety benefits associated with only accessing from West 62nd Street, and since the water main for the majority of the project will be in a looped system. Access to Highway 7 is not proposed for the following reasons: 1. MnDOT classifies Highway 7 as a high- priority regional corridor and will not allow access to Highway 7 if there is an alternative access from a local street, 2. MnDOT is minimizing the number and controlling the spacing of accesses along Highway 7, and 3. City Code requires minimum one - quarter mile (1320 -foot) access spacing along Highway 7. The distance between Church Road and Shorewood Oaks drive is only approximately 2100 feet; therefore, an access from the Boulder Cove development to Highway 7 would not meet City requirements. Recent developments within the Highway 7 corridor include Hidden Creek, Hidden Creek Meadows and Boyer Lake Minnewashta Addition, as shown below. Access to Hidden Creek extends from Highway 7 at Pipewood Curve. The old access was removed due to poor sight lines. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 11 of 25 =Hidden New Pipeweod Curve access Old Pipeweod Curve access Boyer Lake Minnemshta Accesses to Hidden Creek Meadows and Boyer Lake Minnewashta were extended from existing local streets adjacent to these developments. In December, 2005 MnDOT determined that the Church Road intersection at Highway 7 did not meet warrants for the installation of a traffic control signal. The plans show a new public street extending from the curve that connects 62 "d Street to Strawberry Lane. As illustrated on the map below Church Road, 62 "d Street and Strawberry Lane is a route used by buses and parents to drop off and pick up students from Minnewashta Elementary School. Church Road is a 31 -foot wide urban street owned and maintained by the City of Chanhassen. 62 "d Street is a 22 -foot wide rural street. The corporate boundary between Chanhassen and Shorewood bisects 62nd Street. Shorewood currently maintains 62 "d Street. Shorewood's standard street section is 24 -feet wide; Chanhassen's is 31 feet. • Strawberry Lane is a 22 -foot wide rural street owned and maintained by the City of Shorewood. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 12 of 25 Map courtesy of Microsoft Corpomtion Staff met with representatives from the City of Shorewood to discuss the proposed connection to 62nd Street/Strawberry Lane and any future upgrades to these streets since improvements to West 62 "d Street would generally be part of a project to improve Strawberry Lane. Shorewood currently has no programmed plans to widen Strawberry Lane or 62nd Street but anticipates that work within this corridor will be done in the next five to ten years. Staff from both cities recommends that the West 62 "d Street/Strawberry Lane/Boulder Court intersection be improved at this time. The intersection is currently a 90- degree turn. Staff recommends revising the plans to construct a tee intersection at this location to improve the traffic operation. The developer's engineer studied the intersection for stop sign warrants. The study did not show stop signs are warranted based on traffic volumes or accidents. However, stop signs are recommended at this intersection to improve traffic operation characteristics. Also, the intersection of Church Road and West 62 "d Street is a three -way stop condition so adding stop signs at West 62 "d Street and Strawberry Lane intersection is consistent with current traffic operations. Shorewood's City Engineer supports improving this intersection to a three - legged intersection and have a three -way stop condition. The developer must coordinate the intersection work affecting 6195 Strawberry Lane with the homeowner, including tree removal and replacement. The two existing driveway accesses to Highway 7 within the property will be removed with this project. The property owners at 3520 and 3530 Highway 7 (single - family properties immediately east of the development) have elected to keep their access to Highway 7. There is space to extend a future private street from the cul -de -sac in the future. Utilities Sanitary sewer service to the proposed development will be extended from the Metropolitan Council trunk sewer at the intersection of West 62nd Street and Strawberry Lane. The developer is required to obtain any necessary permits from the Metropolitan Council (sewer connection o d 'b $ _. SmiNUwnR Ao pm 1 pVh6 vakpa,,d f Cl ry &Jaa`^ L a 3 rak 9euMYOr :n Ave 0.h 4 Yn9i:tia<Ge a. Q9t lM I'Ni YaAN CaN Map courtesy of Microsoft Corpomtion Staff met with representatives from the City of Shorewood to discuss the proposed connection to 62nd Street/Strawberry Lane and any future upgrades to these streets since improvements to West 62 "d Street would generally be part of a project to improve Strawberry Lane. Shorewood currently has no programmed plans to widen Strawberry Lane or 62nd Street but anticipates that work within this corridor will be done in the next five to ten years. Staff from both cities recommends that the West 62 "d Street/Strawberry Lane/Boulder Court intersection be improved at this time. The intersection is currently a 90- degree turn. Staff recommends revising the plans to construct a tee intersection at this location to improve the traffic operation. The developer's engineer studied the intersection for stop sign warrants. The study did not show stop signs are warranted based on traffic volumes or accidents. However, stop signs are recommended at this intersection to improve traffic operation characteristics. Also, the intersection of Church Road and West 62 "d Street is a three -way stop condition so adding stop signs at West 62 "d Street and Strawberry Lane intersection is consistent with current traffic operations. Shorewood's City Engineer supports improving this intersection to a three - legged intersection and have a three -way stop condition. The developer must coordinate the intersection work affecting 6195 Strawberry Lane with the homeowner, including tree removal and replacement. The two existing driveway accesses to Highway 7 within the property will be removed with this project. The property owners at 3520 and 3530 Highway 7 (single - family properties immediately east of the development) have elected to keep their access to Highway 7. There is space to extend a future private street from the cul -de -sac in the future. Utilities Sanitary sewer service to the proposed development will be extended from the Metropolitan Council trunk sewer at the intersection of West 62nd Street and Strawberry Lane. The developer is required to obtain any necessary permits from the Metropolitan Council (sewer connection Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 13 of 25 permit) and the City of Shorewood (work in right -of -way permit) and the street must be restored. In these situations the Metropolitan Council installs a temporary meter every few years to determine the average flow and bills the City accordingly. The septic tank and mound system that services 3530 Highway 7 is within the project boundaries. The developer has submitted an affidavit stating that the owner of 3530 Highway 7 is aware that these facilities are not within their property. The developer will provide a sanitary sewer service to 3530 Highway 7. According to the Building Department the home at 3520 Highway 7 is connected to the City of Shorewood sanitary sewer system. Water main for the project will be directionally bored under Highway 7 and will wet tap into the existing 12 -inch trunk water main on the south side of Highway 7. Water main will extend between Lot 5, Block I and the tot lot to the existing water main in the southwest comer of 3751 Wes 62"d Street. An emergency water main interconnect will be required to the Shorewood watermain at West 62 d Street and Strawberry Lane. This interconnection is mutually beneficial to Chanhassen and Shorewood so that the water mains can be connected during system disruptions to maintain reasonable water pressure. The developer shall salvage and reinstall the Shorewood hydrant five feet behind the back of curb. Eight -inch water main will be installed within the proposed street. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 14 of 25 The proposed water main looping is critical since the existing service area north of Highway 7 is currently served by only one water main crossing under Highway 7. Looping the water main will minimize service disruptions should a water main break occur north of Highway 7. The developer proposes to extend a water service to the 3520 Highway 7 property. All existing and proposed off -site drainage and utility easements must be referenced accordingly. Existing off -site easements must be referenced by document number or the plat in which they were dedicated. 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. The developer must pay a portion of the City Sanitary Sewer Access Charge (City SAC) and City Water Access Charge (City WAC) with the final plat: City SAC: $664 /unit x 30 units = $19,920 City WAC: $1,886 /unit x 30 units = $56,580 Full City SAC and WAC charges for 3520 Highway 7 shall be paid when the property connects to the utilities. Storm Water Utility The Surface Water Utility Charges are calculated based upon land use type and land area. Credits are applied based upon storm water practices being implemented. The following table illustrates the Storm Water Utility Charges associated with the development of this parcel. Area Rate Total Water Quality 12.04 ac $2,830/ac $34,073.20 Water Quantity 12.04 ac $5,590/ac $67,303.60 Treatment BMP Credit 13.01 ac $1,415 /ac ($18,409.15) $82,967.65 Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 15 of 25 Grading, Surface Drainage and Water Quality Practices Residents to the north and west of the proposed development have indicated that there are drainage problems within their neighborhoods. The area draining off site, the volume of runoff and the peak discharge rate will decrease under the post development condition. Because this will result in greater than one acre of new impervious, it must meet the requirements set forth in the General Permit Authorization to Discharge Stormwater Associated with Construction Activity Under the National Pollution Discharge Elimination System/State Disposal System Program (NPDES Construction Permit). In addition to erosion prevention and sediment control practices, this includes permanent stormwater management as discussed in Part III.D of the permit. This section of the permit requires that the first inch of runoff from impervious surfaces is retained on site. If infiltration is prohibited (see Part III.D.I j), other methods of volume reduction should be evaluated. In either case, that water quality volume must be treated. The applicant is proposing a filtration feature and a wet sedimentation pond and is seeking credit for abstraction from the canopies of the newly planted trees. The preservation of existing tree canopy and the establishment of new overstory trees is an accepted practice under the Minnehaha Creek Watershed District rules and the Minimal Impact Design standards. The applicant has indicated that over one acre of tree canopy will be preserved on the site. Staff is having trouble discerning where this amount of tree preservation is occurring. They must provide an exhibit showing where these protected canopy areas are. This shall be the grading limits overlaid on a current aerial photograph with leaf out conditions or a similar exhibit agreed to by the city. Only the preservation of tree canopy within the boundaries of Boulder Cove shall be counted towards this credit. The hydrology report indicates that 124 trees will be planted. Of these 31 are ornamental trees which are not considered overstory trees and shall not be counted towards the abstraction volume. The applicant will need to calculate the resulting abstraction due to tree establishment without the ornamental trees. The applicant is providing rate control, volume reduction and water quality improvements through the installation of a filtration basin and a wet detention pond. Infiltration is infeasible due to the poorly drained clay soils and the shallow water table on the site. Minnehaha Creek has established criteria for the use of filtration and tree preservation as a volume reduction practice. The filtration feature shall be the responsibility of the homeowners association. The city will maintain the outlet structure and reinforced concrete pipe within Outlots C and D, but the filtration feature and the plantings shall be the responsibility of the HOA or the developer. An operations and maintenance manual shall be drafted and provided to the City for review and comment prior to issuing any building permits for Lots 1 -10 of Block 3. A detailed planting plan and schedule shall also be developed for this feature and included as part of the landscaping plan. This planting should include shrubs or some other effective screen to assure that yards do not encroach into the filtration feature thereby rendering it ineffective as a water quality BMP. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 16 of 25 Long -term pond maintenance is becoming a larger portion of the city's maintenance budget. It is far more cost effective to proactively reduce sediment delivery to the ponds than it is to dredge the ponds out as needed. Given the confined space on the site, an additional forebay is not an option. The design shall include the installation of environmental manholes or four -foot or deeper sump manholes with a SAFL baffle at CBMHI and CBMH3. The plans must show the existing drainage and utility easement that will encompass the east -west portion of the proposed six -inch drain tile as it daylights to the Highway 7 ditch. CBMH 1 must be located to the common property between Lots 7 and 8, Block 2. The storm sewer line within Block 2 shall be realigned so that it will not be under a retaining wall. The plat must be revised to include rear drainage and utility easements that are at least 10 feet wide. The proposed grading creates a low spot to the southeast of Lot 13, Block 3, outside of the project limits. The developer shall either work with the property owner to grade this area to eliminate the low spot or install a storm drain to the area. If any drain tile is encountered during construction the developer's contractor must contact the City to determine if the tile is to be removed or connected to the development's infrastructure. The developer shall work with the City of Shorewood to determine if storm sewer can be extended to the north side of West 62 a Street to alleviate some of the existing drainage issues in the area. Erosion Prevention and Sediment Control Because this will result in greater than one acre of new impervious, it must meet the requirements set forth in the General Permit Authorization to Discharge Stormwater Associated with Construction Activity Under the National Pollution Discharge Elimination System/State Disposal System Program ( NPDES Construction Permit). As part of the NPDES the applicant must develop or cause to be developed a Surface Water Pollution Prevention Plan ( SWPPP) with all of the elements required under Part III of the permit. Section 18 -40 of Chanhassen city code requires that the SWPPP be provided with the preliminary plat submittal. The applicant must submit an amended SWPPP with the required elements to the city prior to final plat approval. This is not intended to be an exhaustive list of the deficient SWPPP items. The Minnesota Pollution Control Agency has available on their website a SWPPP Checklist that the applicant can reference. Items of note missing from the SWPPP include a narrative discussing, among other things, training requirements, chain of responsibility, discussion of Lake Virginia as an impaired water, and long -term operations and maintenance of the storm water best management practices. Additional discussion of stormwater management practices also need to be included in the SWPPP, particularly as in relates to the use of filtration as a stormwater BMP. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 17 of 25 Many of the other required elements have been provided but are located throughout the plan set or in other documents entirely. The SWPPP should be a single standalone document that assembles the required information in one document for ease of review, inspection, maintenance and assurance of compliance. Groundwater Soil boring information has been submitted and indicates that groundwater elevations fluctuate from approximately 962' within the tot lot to approximately 973.5' on Lot 11 of Block 2. The lowest floor elevations of the proposed buildings are at least three feet above the groundwater elevation Because of the shallow water table and the backyard drainage, all recommendations of the March 3, 2014 Braun report shall be incorporated into the site grading and all construction measures for the site. This is of particular importance for the houses in Block 1 and Lots 1 -5 of Block 2 to prevent ground water intrusion into the basements. Further, sump pump discharge shall be directed to drain tiles or directly to the ponding areas. In 2006 Barr Engineering completed an analysis and determined that the proposed high water elevation would not significantly increase the groundwater elevation near the existing homes west of the site. The developer will install a French drain system on the west side of the pond to lower the groundwater elevation to approximately 966', which would provide a three -foot separation between the groundwater elevation and the lowest floor elevations of the adjacent homes. This French drain system will be a significant benefit from the existing condition and will allow for the properties to the west of the project to connect sump pumps to the French drain system. According to a resident a field drain tile was installed on the west side of the development many years ago. If any drain tile is encountered during construction the developer's contractor must contact the City to determine if the tile is to be removed or connected to the development's infrastructure. RETAINING WALLS The developer proposes to install a 590 -foot long boulder wall along the north side of the berm in Outlot A. The maximum height of the wall is three feet. The developer must sign an encroachment agreement to allow for the boulder wall within the drainage and utility easement over Outlot A. A 90 -foot long retaining wall is also proposed on the east side of Lot 13, Block 3. The top and bottom of wall elevations must be shown on the plan view. The plans must be revised so that construction of the wall will not encroach onto the adjacent property. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 18 of 25 MISCELLANEOUS A high- tension power line exists along Highway 7. Any work or landscaping must be approved by Xcel Energy. PARK DEDICATION Parks This property is located within the neighborhood park service area for Cathcart Park. Future residents of Boulder Cove will have convenient access to the park from West 62' Street. Cathcart Neighborhood Park is unique in that the park is owned and operated by the City of Shorewood, but is located in the City of Chanhassen. The two cities operate the park with an agreement that Shorewood provides for all capital improvements and daily operations and Chanhassen mows the lawn and trims the trees and bushes. Cathcart Park is 4.75 acres in size and features a playground, basketball court, hockey rink with shelter, tennis court, and a ball field. Ample off -street parking is available at the park. The amenities at the park have been updated within the past 10 years. No additional parkland acquisition is being recommended as a condition of this subdivision. Trails The subject site does not have direct access to a trail; however, convenient access to the Southwest LRT Trail is available from West 62nd Street. The Southwest LRT Trail is situated within a corridor owned by the Hennepin County Regional Rail Authority (HCRRA). Three Rivers Park District manages the corridor as a multi-use trail through an agreement with HCRRA. This particular section of the trail travels west to the City of Victoria and east to Minneapolis. Access to this trail is a very desirable recreational amenity and will be widely utilized by the future residents of Boulder Cove. No additional trail construction is being recommended as a condition of this subdivision. TREE PRESERVATION/LANDSCAPING The applicant for the Boulder Cove development has submitted tree canopy coverage and preservation calculations. They are as follows: Total upland area (excluding wetlands) 13.38 ac. or 582,832 SF Baseline canopy coverage 50% or 293,021 SF Minimum canopy coverage allowed 35% or 203,991 SF Proposed tree preservation 9% or 53,713 SF The applicant does not meet minimum canopy coverage allowed; therefore, the difference between the baseline and proposed tree preservation is multiplied by 1.2 to calculate the required replacement plantings. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 19 of 25 Difference in canopy coverage 160,979 SF Multiplier 1.2 Total replacement 193,175 SF Total number of trees to be planted 177 trees The total number of trees required for the development is 177. The applicant has proposed a total of 155 trees and does not meet minimum requirements. Staff recommends that the applicant increase the number of trees planted in order to meet the minimum quantity required. Bufferyard requirements are as shown in the table: Landscaping Item Required Proposed Bufferyard B — South property line, Hwy 7 9 overstory trees* 9 overstory trees* 920', 25' width 18 understory trees 54 understory trees *Overhead power lines present — only 36 shrubs 0 shrubs ornamentals allowed within 25' of line Applicant meets total minimum requirements for bufferyard plantings. In regards to the bufferyard plantings, there are overhead power lines along Highway 7. Staff recommends that Xcel Energy planting guidelines be followed and only ornamentals be allowed to be planted in the bufferyard within the utility easement. Planting the appropriate trees will avoid `tree- topping', a labor- intensive detrimental practice, and assist in creating a safer clear zone around the power lines. The overstory trees that are required in the south bufferyard shall be designated as understory trees and added to the overall total for that item. City ordinance also states that no more than one -third of the trees in the landscape plan may be from any one tree species. In this plan, Black Hills spruce comprise one -third of the total trees planned. Staff recommends that additional species be planted to reduce the overall percentage attributed to this species. The additional species shall not include any species of maple. This genus is also overplanted in this development. Relying too heavily on just one type of tree creates a monoculture situation where pest or disease problems can cause a significant impact. City ordinance states that evergreens must average seven feet when planted. All evergreens specified for planting in this development are called out at a height of six feet. Staff recommends that the minimum average height be met. The tree inventory submitted by the applicant was completed in 2005. Now, nine years later, there are additional trees that would meet the criteria to be inventoried. There would also be some trees whose conditions have changed, and possibly some that no longer exist. It is challenging to get a proper perspective of the site with outdated information. Since the applicant is clearing all but 9% of the trees on site, there are few opportunities to preserve trees and therefore the lack of up -to -date data can be compensated for by the fact that few individual trees are able to be preserved. Mr. Todd Gerhardt Boulder Cove - Planning Case 2014 -09 June 9, 2014 Page 20 of 25 An additional challenge with the tree inventory plan submitted by the applicant are the several discrepancies shown on the plan sheet. First, there are trees shown to be removed by the applicant as part of the subdivision that are not on the applicant's property. Any tree removal outside the parameters of the subject property shall require approval of the property owner. Second, there are a handful of trees whose designation as saved or removed needs to be clarified. Tree #96, red oak: shown on plan at the very edge of the grading limits. Tree appears to be in a position for a possible save. It is in fair condition. Staff recommends that applicant work with staff to preserve tree if appropriate. Tree #205, 4206, ash: shown on plans as saved. These trees are within the grading limits and have proposed grading shown on top of their locations. Trees shall be noted as REMOVE. The applicant is proposing to preserve a 50 -inch diameter bur oak (tree #71) that is in good condition. This tree is well worth the applicant's effort and will be a signature tree. Staff recommends that the applicant be required to install tree protection fencing at the edge of the drip line of the tree and inside the fencing spread a 3 to 4 -inch layer of woodchips to protect the root zone. These protections shall remain in effect until construction is completed. COMPLIANCE WITH ORDINANCE - RLM DISTRICT Block Lot Area (SF) Buildable Area Lot Width at Front Setback Line Lot Depth Home Setback 9,000 RLM 35% RLM 50' RLM 110' RLM Front/Rear/ Garage Side/ House Side 1 1 1 11,395 3,988 107 194 25/25/5/10 1 2 15,132 5,296 66 190 25/25/5/10 1 3 12,292 4,302 65 188 25/25/5/10 1 4 12,129 4,245 65 185 25/25/5/10 1 5 11,966 4,188 65 184 25/25/5/10 1 6 12,004 4,201 54 135 25/25/5/10 2 1 10,374 3,630 64 130 25/25/5/10 2 2 10,664 3,732 57 134 25/25/5/10 2 3 10,682 3,738 54 143 25/25/5/10 2 4 9,791 3,426 61 154 25/25/5/10 2 5 10,030 3,510 65 166 25/25/5/10 2 6 10,798 3,779 65 174 25/25/5/10 2 7 11,288 3,950 63 178 25/25/5/10 2 8 11,634 4,071 67 174 25/25/5/10 2 9 15,510 5,428 77 158 25/25/5/10 2 10 10,441 3,654 70 116 25/25/5/10 2 11 11,065 3;872 209 25/25/5/10 Corner Lot Mr. Todd Gerhardt Boulder Cove - Planning Case 2014 -09 June 9, 2014 Page 21 of 25 Block Lot Area (SF) Buildable Area Lot Width at Front Setback Line Lot Depth Home Setback 9,000 RLM 35% RLM 50' RLM 110' RLM Front/Rear/ Garage Side/ House Side 3 1 11,130 3,895 91 152 25/25/5/10 3 2 10,286 3,600 65 158 25/25/5/10 3 3 10,400 3,640 65 170 25/25/5/10 3 4 12,125 4,243 76 125 25/25/5/10 3 5 10,303 3,606 64 115 25/25/5/10 Comer lot 3 6 10,119 3,541 59 170 25/25/5/10 3 7 10,096 3,533 63 159 25/25/5/10 3 8 10,261 3,591 60 155 25/25/5/10 3 9 10,240 3,584 65 143 25/25/5/10 3 10 10,105 3,536 61 144 25/25/5/10 3 11 9,801 3,430 63 136 25/25/5/10 3 12 9,653 3,378 64 145 25/25/5/10 3 13 10,224 3,578 64 141 25/25/5/10 Outlot A 82,033 Outlot B 10,888 Outlot C 36,362 ROW 88,118 Staff recommends that the City Council adopt the following motion: "The City Council grants final plat approval of Planning Case 42014 -09 for Boulder Cove to subdivide 13.38 Acres into 30 lots and 4 outlots as shown in plans dated received May 22, 2014, subject to the following conditions: Park and Recreation Conditions Full park fees in lieu of additional parkland dedication and/or trail construction shall be collected as a condition of approval for Boulder Cove. The park fees will be collected in full at the rate in force upon final plat submission and approval. Based upon the current proposed lot count of 30 homes and the city's 2014 single - family park fee of $5,800 per unit, the total park fees for Boulder Cove would be $174,000. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 22 of 25 Environmental Resources Conditions 1. Tree preservation fence shall be installed at the edge of the drip line for tree #71. A layer of woodchips shall be installed over the root zone to a depth of 3 -4 inches. All other tree preservation fencing shall be installed at the edge of the grading limits prior to any construction. 2. Additional tree species shall be added to the plant schedule so that no more than 10% of the trees are from any one species and no more than 20% are from any one genus. Additional trees must be overstory species. The minimum number of trees to be planted is 177. A revised landscape plan must be submitted and approved by the city prior to any grading. 3. Evergreens shall average seven feet in height when planted. 4. Applicant shall correct the tree inventory for the following trees: Tree #96, red oak: shown on plan at the very edge of the grading limits. Tree appears to be in a position for a possible save. It is in fair condition. Staff recommends that applicant work with staff to preserve tree if appropriate. Tree #205, #206, ash: shown on plans as saved. These trees are within the grading limits and have proposed grading shown on top of their locations. Trees shall be noted as REMOVE. Building Department Conditions 1. Final grading plans and soil reports must be submitted to the Inspections Division before building permits will be issued. 2. Engineered design and building permits are required for retaining walls exceeding four feet in height. 3. Each lot must be provided with a separate sewer and water service. 4. Demolition permits must be obtained before demolishing any structures. 5. Proper removal, abandonment or sealing of storage tanks, on -site septic systems, wells, etc. required. Permits required, as applicable. 6. If applicable, existing home(s) affected by new street will require address changes. Fire Marshal Conditions 1. Three feet of clear space must be maintained around fire hydrants. 2. Fire hydrants must be made serviceable prior to combustible construction. 3. Temporary street signs shall be installed prior to and during construction. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 23 of 25 4. Fire apparatus access roads capable of supporting the weight of fire apparatus shall be made serviceable prior to combustible construction. 5. No burning permits will be issued for the removal of brush, trees. Plannine Department Conditions 1. Any plans showing or describing "Next Generation" homes should not be included because they are not permitted under current city ordinances. 2. A high- tension power line exists along Highway 7. Any work or landscaping must be approved by Xcel Energy. Engineering Department Conditions Before construction can begin the developer is required to obtain any necessary permits from the Metropolitan Council (sewer connection permit) and the City of Shorewood (work in right of way permit). 2. As required by Shorewood's City Engineer the intersection shall be a three -way stop condition. 3. The developer must coordinate the intersection work affecting 6195 Strawberry Lane with the homeowner, including tree removal and replacement. 4. The developer shall salvage and reinstall the Shorewood hydrant five feet behind the back of curb. 5. The septic tank and mound system that services 3530 Highway 7 is within the project boundaries. These items must be removed and disposed of at an approved facility in conjunction with the site improvements as proposed. 6. The developer must pay a portion of the City Sanitary Sewer Access Charge (City SAC) and City Water Access Charge (City WAC) with the final plat: City SAC: $664 /unit x 30 units = $19,920 City WAC: $1,886 /unit x 30 units= $56,580 7. Before the plat is recorded it must be revised to include rear drainage and utility easements that are at least 10 feet wide. 8. All existing and proposed off -site drainage and utility easements must be referenced accordingly. 9. The plans must show the existing drainage and utility easement that will encompass the east - west portion of the proposed six -inch drain tile as it daylights to the Highway 7 ditch. Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 24 of 25 10. The proposed grading creates a low spot to the southeast of Lot 13, Block 3, outside of the project limits. Before construction is completed the developer shall either work with the property owner to grade this area to eliminate the low spot or install a storm drain to the area. 11. If any drain tile is encountered during construction the developer's contractor must contact the City to determine if the tile is to be removed or connected to the development's infrastructure. 12. The developer shall work with the City of Shorewood to determine if storm sewer can be extended to the north side of West 62nd Street to alleviate some of the existing drainage issues in the area. 13. 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. Water Resources Coordinator Conditions 1. A homeowners association shall be created and shall be responsible for the maintenance of the filtration feature. The outlet pipe shall be the responsibility of the city. 2. An operations and maintenance manual shall be developed for the filtration feature indicating how the homeowners association will maintain the feature and assure its proper function. 3. All recommendations relating to subgrade improvements, preparations and drainage as well as dewatering and drainage control from the March 3, 2014 Braun report shall be implemented. 4. The Swale behind lots 4 through 10 of Block 2 shall have a drain tile installed as part of the site grading and utility installation. This shall be included before final plat approval. 5. Environmental manholes or four -foot sump manholes with SAFL baffles shall be installed at CBMH2 and CBMH4. 6. CBMH 1 must be located to the common property between Lots 7 and 8, Block 2. The storm sewer line within Block 2 shall be realigned so that it will not be under a retaining wall. 8. A comprehensive, stand -alone SWPPP document with all elements required by Part III of the NPDES construction permit shall be prepared and submitted to the City for review and comment before final plat approval. 9. The Surface Water Management connection charges are $82,967.65. 10. In the event that wetland characteristics are observed on the site during field visits during the growing season, steps will need to be taken to assure compliance with the MN Wetland Mr. Todd Gerhardt Boulder Cove — Planning Case 2014 -09 June 9, 2014 Page 25 of 25 Conservation Act, the Federal Clean Water Act and other applicable federal, state and local regulations." ATTACHMENTS 1. Final Plat. 2. Letter from Paul Homby, Shorewood City Engineer, dated May 29, 2014. g: \plan\2014 planning cases\2014 -09 boulder coveViinal plat dm=ents\fnal plat.doc �seW g EdiiEg�Et :� �ji $ i o w U z Z f #F�fg €EE 4i {jis rz it uj a a R I \\ •\ 'c � I f i n #} U �' '�'.� \�����•. , �zyWdFe�tt} � � I ! 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Box 147 7700 Market Boulevard Chanhassen, MN 55317 Re: Plan Review Comments Boulder Cove Development WSB Project No. 01459 -90 Dear Ms. Fauske: Thank you for the opportunity to comment on the plans for the proposed Boulder Cove subdivision located within the City of Chanhassen. The comments provided below are on behalf of the City of Shorewood, pertaining to the improvements within the City of Shorewood. • There is a Shorewood resident located 6195 Strawberry Lane that will be affected by the Strawberry Lane /West 62nd Street intersection improvements. Removal of a tree or trees may be necessary to construct the intersection as planned. Has the developer or the City contacted this resident regarding the proposed improvements? • The plans do not appear to include any tree removal, replacement or transplanting. If the trees are not in conflict with the improvements, they can remain in the City right of way. • If tree removal is necessary, the developer should review the potential to transplant trees, or discuss replacement with the property owner. A replacement tree or trees would be preferred outside of the right of way with 6 -foot tall trees. • The plans should show that the Shorewood hydrant is to be salvaged and re- installed 5- feet behind the back of curb. • The traffic study prepared by the developer indicated that traffic warrants are not met for a three way stop condition. The sight line for traffic approaching the intersection from all directions does not appear to meet the minimum 130 -foot sight distance criteria for 30 mph design speed. A three way stop condition should be warranted based on the reduced sight line for approaching traffic. St. Cloud • Minneapolis • St. Paul Equal Opportunity Employer wsbengtom x VM4ss-�nettmm�emd CweLLTk -PTH_AFu1,-053914- soma«cmeo.. om=exmw.dw Ms. Alyson Fauske, P.E. May 29, 2014 Page 2 • The City of Shorewood has some residents that have no drainage outlet to the front yard areas adjacent to the proposed subdivision on West 62nd Street. We request extension of a small pipe be extended to the north of West 62 "d Street to provide an outlet that drains to the proposed storm sewer. The outlet could be sized small enough (6 to 8 -inch diameter) so it does not impact the development storm sewer or pond capacity. We appreciate the opportunity to review this development plan. Please do not hesitate to contact me to discuss our plan review comments. Sincerely, WSB & Associates, Inc. Paul Homby, P.E. Shorewood City Engineer cc: Larry Brown, City of Shorewood Brad Nielsen, City of Shorewood Pth K b1459-9WUdmi,lNCa18oWM Cwe TR- PfH_AFusleL5391< -BulE Cove ]Wmml Reviewdw