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HomeMy WebLinkAbout2019-09-23 PACKET 06.2. STAFF REPORT CASE: ZA2019-046 & PP2019-047 ITEM: 6.2 PUBLIC MEETING DATE: 9/23/19 TENTATIVE COUNCIL REVIEW DATE: 10/16/19 APPLICATION APPLICANT: Londyn Development, LLC REQUEST: A zoning amendment to change the zoning of 9.85 acres of land from AG-1, Agricultural Preservation, to R-4, Low Density Residential; and a preliminary plat for a residential subdivision to be called Ravine Meadows that would create 26 lots for detached single-family home and one outlot. SITE DATA LOCATION: 9255 Military Road and the parcel to the east ZONING: AG-1, Agricultural Preservation GUIDED LAND USE: Low Density Residential LAND USE OF ADJACENT PROPERTIES: CURRENT GUIDED NORTH: Agricultural Low Density Residential EAST: Agricultural Low Density Residential SOUTH: Residential Low Density Residential WEST: Agricultural Low Density Residential SIZE: 9.85 acres DENSITY: 2.6 units per acre RECOMMENDATION Approval, subject to the conditions stipulated in this staff report. COTTAGE GROVE PLANNING DIVISION Planning Staff Contact: John M. Burbank, Senior Planner; 651-458-2825; jburbank@cottagegrovemn.gov Application Accepted: 8/29/19 60-Day Review Deadline: 10/27/19 City of Cottage Grove Planning Division  12800 Ravine Parkway South  Cottage Grove, MN 55016 Planning Staff Report Ravine Meadows Planning Case Nos. ZA2019-046 PP2019-046 September 23, 2019 Proposal Londyn Development, LLC has requested a zoning amendment to change the zoning of 9.85 acres of land including the parcel located at 9255 Military Road South and the parcel to the east from AG-1, Agricultural Preservation, to R-4, Low Density Residential; and a preliminary plat for a residential development to be called Ravine Meadows that would create 26 lots for detached single-family homes and one outlot. Location Map Review Schedule Application Received: August 28, 2019 Application Accepted: August 29, 2019 Planning Commission Meeting: September 23, 2019 60-Day Review Deadline: October 27, 2019 Tentative City Council Meeting: October 16, 2019 Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 2 of 16 Background and Site Conditions The property at 9255 Military Road South is currently occupied with a single-family home and associated outbuildings. There is a variety of mature trees and other vegetation on the site. The current access to the property is on Military Road. The current use of the eastern parcel is agri- cultural. The eastern parcel does not have any improvements or access drives to Military Road. Site Orthophoto Planning Considerations Plan Review The dates of the plan sets utilized for this review were submitted by Landform and are dated 08/28/2019. There are 13 sheets of information included in the submittal plan set. Preliminary Plat The creation of the preliminary plat as proposed depicts a logical development of viable develop- ment properties given the adopted performance standards of the zoning district. The preliminary plat is detailed below. Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 3 of 16 Proposed Preliminary Plat Land Use The property is currently guided for Low Density Residential. No changes in land use are proposed with this development. The proposed use in in compliance with the land use designations as guided in the 2030 and 2040 Comprehensive plans. Zoning The property is currently zoned AG1, Agricultural Preservation. The requested rezoning to R-4, Low Density Residential, and lot design and configuration are consistent with the recent surround- ing residential subdivisions. Zoning Development Standards The development performance standards for the requested zoning district classification are detailed below. Lot Development Performance Standards Standard Proposed Zoning = R4 Residential Minimum Lot Area 7,500 sf Minimum lot width Interior 60 feet Minimum lot width Corner 70 feet Minimum side yard setback House 7.5 feet Minimum side yard setback Garage 5 feet Minimum front yard setback 30 feet Minimum rear yard setback 35 feet Corner lot setback 20 feet Minimum lot width at Right-of-way for Cul-de-sac lots 65 feet Minimum lot width at setback for Cul-de-sac lots 90 feet Maximum Principal structure height 35 feet Maximum lot coverage Impervious Surfaces 40 percent Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 4 of 16 Lot Sizes As stated above, the minimum lot size is 7,500 square feet for the R-4 zoning district. The smallest lot size proposed is 8,560 square feet, and the largest lot size is 22,180 square feet. The average lot width is 71.98 feet. Density The density of the proposed development is 2.6 gross units per acre. The density range for the Low Density Residential Land Use District is one to four dwelling units per acre. Public Utilities The property is currently located in the Metropolitan Urban Service Area (MUSA) and has public utilities available for service connection. The installation of the on-site utilities, roads, and sup- porting infrastructure will be privately designed and constructed to meet City specifications. The image below identifies a preliminary utility location detail for the project. The engineering memo dated September 13, 2019 from Bolton & Menk, addresses the utility comments for the project. Area charges will be collected per City Ordinance. A Sewer Availability Charge (SAC) will be required to be paid for each lot in the subdivision at the time of building permit. Utility Plan Environmental Assessment Worksheet (EAW) The proposed project is below the lot count threshold that would trigger an environmental review prior to development. Transportation The through street for the proposed development connects to Ravine Parkway adjacent to Jeffery Avenue to the south. No direct driveway access is permitted to Ravine Parkway and the Military Road public right-of-way for the lots abutting said right-of-way. Public right-of-way 33 feet in width is required to be platted along Military Road adjacent to the plat. The final plat shall reflect the road name as Jeffery Avenue South. Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 5 of 16 Street Detail Surface Water Management The surface water management plan was reviewed by the City’s engineering staff, and their com- ments are included in the September 19 plan review memorandum from Bolton & Menk. The storm sewer and ponding will need to be designed to meet all City and South Washington Water- shed District Requirements. A revised surface water management plan will be required that addresses all comments. Grading The preliminary grading plan was reviewed by Engineering and comments are included in the September19 memorandum from Bolton & Menk. Additional grading review will be required upon submittal of final grading and utility plans for the site. Grading Plan Tree Preservation The existing tree mass on the site is shown below. A component of the final plat approval will be the submittal of a tree preservation inventory and mitigation plan as outlined in the City’s new tree preservation ordinance. Mitigation trees will be required to be planted on the lots abutting Outlot A and the Military Road/Trail Corridor. Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 6 of 16 Existing Tree Mass Area Landscaping The project will include the standard boulevard tree plantings as detailed below. Typical Boulevard Tree Planting Detail The applicant is also proposing to create a buffer to the single-family residence along the eastern property line. This buffer will be north of the stormwater ponding area and will include a 4 to 6- foot high berm and landscaping. The location of these features is shown below. Screening, Berming, and Buffer Area Location Detail Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 7 of 16 Fire Department Access The through roadway connections and lot count satisfy the secondary access requirements per the fire code. Trails and Sidewalks A sidewalk is proposed to be installed as part of this project; the location is detailed in orange below. The costs of removing 50 percent of Military Road along the length of the project and 50 percent of the construction of a future bituminous recreational trail in the road/trail right-of-way along Military Road (green line below) will be required to be paid in full at the time of development. The bituminous trailways (in red below) along Ravine Parkway were constructed as a component of the 2019 parkway improvement project. Park Dedication No neighborhood parks are identified for this area, so per the City ordinance, a park dedication cash fee for each lot will be required to be paid be at the time of recording of the final plat. Five public park and open space markers will be required to be installed by the developer around the stormwater outlot. Historic Preservation The existing buildings on the site are not of historic significance. Architecture The home styles within the neighborhood will be dependent on the group of builders that the Developer signs onto the project. The minimum home size will be 2,100 square feet, and the market will determine the brick and stone amenities. It is reported that the new homes will be consistent with surrounding single family residential developments. Subdivision Monument Based on the size of the development and lack of common open space areas, no subdivision monument signage is proposed. Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 8 of 16 Summary 1) The property is guided for low density residential, and the requested preliminary plat design fits within the parameters of the required density. 2) The proposed zoning for the project and the requested preliminary plat design fits within the parameters of other existing development projects in the area. 3) The property is within the MUSA and can be properly served by public utilities. 4) The surface water management of existing and new streets and housing will be properly ad- dressed with this development. 5) The traffic generated from the project will not have negative impacts on the adjacent roadways. Recommendation That the Planning Commission recommend that the City Council approve: A. A zoning amendment to change the zoning of 9.85 acres of land including the parcel located at 9255 Military Road South. and the parcel to the east from AG-1, Agricultural Preservation, to R-4, Low Density Residential. B. Aa preliminary plat for a residential to be called Ravine Meadows that would create 26 lots for detached single-family homes and one outlot. Approval of the preliminary plat is subject to the following conditions: General Development 1. The developer and builders must comply with all city ordinances and policies except as may be modified by agreement of the developer and City staff. 2. All grading, drainage, erosion control, and utilities must conform to the final plans approved by the City Engineer. 3. The applicant receives appropriate building permits from the City, and permits or approvals from other regulatory agencies including, but not limited to: South Washington Watershed District, Minnesota Department of Health, Minnesota Department of Natural Resources, and Minnesota Pollution Control Agency. 4. The Developer shall incorporate into the final plat the recommendations, requirements, and evaluations noted in the from Bolton &Menk memorandum dated September 13, 2019, subject to modifications that are agreed to by the developer and City Engineer. Platting, Land Dedication, and Easements 5. The final plat and the City’s approval of the final plat are subject to additional conditions that will be listed in the City resolution approving the final plat and included in the develop- ment agreement. Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 9 of 16 6. The dimensions of each lot must be verified on the final plat, and a list containing the square footage for each lot must be provided to the City. 7. The developer must enter into an agreement with the City of Cottage Grove for the com- pletion of the public improvements required by City ordinances. Once the development agreement is completely executed and all cash deposits and payments are paid to the City, the City will release the final plat to the developer for recording at the Washington County Recorder’s Office. 8. Common mailboxes meeting the approval of the local postmaster are required. 9. Public right-of-way 33 feet in width is required to be platted along Military Road adjacent to the plat. Construction and Grading 10. A grading permit and financial guaranty is required for grading activity related to the project. 11. Prior to Council review of the final plat, the developer must submit for staff review and approval a final construction management plan that includes erosion control measures, project phasing for grading work, areas designated for preservation, a crushed-rock con- struction entrance, and construction-related vehicle parking. All emergency overflow swales must be identified on the grading and erosion control plan. 12. A pre-construction meeting with City staff and the contractor must be held before site work begins. The contractor will provide the City with a project schedule for the various phases of construction. 13. Erosion control devices must be installed prior to commencement of any grading activity. Erosion control shall be performed in accordance with the recommended practices of the “Minnesota Construction Site Erosion and Sediment Control Planning Handbook” and the conditions stipulated in Title 11-6-12, Erosion Control During Construction of the City’s Subdivision Ordinance. 14. Upon completing site grading, four copies of an “As-Built” survey for the site grade eleva- tions must be submitted to the City. An electronic file of the “As-Built” survey must be sub- mitted to the City Engineer. Park Dedication 15. The park dedication requirements will be satisfied upon the payment of the required cash in lieu of land dedication as detailed in the development agreement and at the time of recording of the Final plat. Lot Performance Standards 16. All lot performance standards shall be consistent with those identified in the planning staff report dated 09/23/2019. 17. The architectural standards of the homes shall be consistent with the following: Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 10 of 16 a. The minimum finished floor area for a single-family home shall be 2,100 square feet. b. The minimum attached garage floor area shall be 440 square feet for detached single-family dwellings and for each attached dwelling unit. c. Windows, doors, and garage doors must have a low or no maintenance trim on all four sides of the principal structure for lots abutting the Ravine Parkway and the Military road /trail corridor. d. The minimum roof pitch for the main roof slope is a 6/12 pitch. Utilities 18. The Developer is responsible for providing the necessary easements and costs associated with road and utility improvements serving the site. All drainage and utility easements as recommended by the City Engineer must be shown on the final plat and dedicated to the City for public purposes. 19. The water utility plan shall conform to the City’s water supply and distribution plan. 20. The sanitary sewer utility plan shall conform to the City’s sanitary sewer comprehensive plan. 21. All stormwater designs shall meet the intent of the City’s Surface Water Management Plan and the SWWD water management plan. 22. The developer must make all necessary adjustments to the curb stops, gate valves, and metal castings to bring them flush with the topsoil (after grading). 23. All existing wells must be sealed in accordance with statutory requirements. 24. Demolition and removal of existing septic systems shall be required prior to the issuance of a building permit. Streets 25. Direct drive access to the Military Road/trail corridor and the Ravine Parkway right-of way from abutting lots within the subdivision shall be prohibited. 26. The street name shall be Jeffery Avenue South on the final plat. 27. The City’s curb replacement policy must be complied with during home building. A bitumi- nous wedge shall be maintained on the street until 90 percent of the homes are constructed in any phase or in three years. Tree Mitigation 28. A final tree preservation and mitigation plan shall be submitted before final plat approval. Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 11 of 16 Landscaping and Irrigation 29. In addition to one boulevard tree for each lot having street frontage, four yard trees and ten shrubs must be planted on each residential lot. One of the four trees must be a conifer tree. The developer or builder must post a letter of credit or escrow for the estimated cost of these trees and shrubs on each lot. 30. Irrigation systems installed within City right-of-way are solely the responsibility and risk of the developers, or individual. The City is not responsible or liable for any damage or costs related to installation, damage, or replacement of lawn irrigation systems placed in the boulevard as a result of City use of or future changes in the right of way. 31. At the time of building permits for single family residential lots, a letter of credit amounting to 150 percent of the landscaping estimate and irrigation systems shall be submitted to and approved by the City. Upon completion of the landscaping improvements, the owner shall, in writing, inform the City that said improvements have been completed. The City shall retain the financial guarantee covering the landscape improvements for a period of one year from the date of notice, to ensure survival of the plants. No building permit shall be issued until the required financial guarantee has been received and accepted by the City. Surface Water Management 32. The lowest opening ground elevations of all structures shall be a minimum of two feet above the emergency overflow elevation, and three feet above adjacent pond high water levels. 33. All emergency overflow swales must be identified on the grading and erosion control plan. Each fall while home building is occurring, emergency overflow elevations shall be sur- veyed to ensure the emergency overflows are properly graded and maintained. Onsite Infrastructure Improvements 34. The costs of removing 50 percent of Military Road along the length of the project and 50 percent of the construction of a future bituminous recreational trail in the road/trail right-of- way along Military Road will be required to be paid in full at the time of development. 35. The developer shall pay the Ravine Parkway Assessment for both properties included in the development. 36. A street lighting plan must be submitted by the developer and approved by the City Engi- neer. 37. The developer must place iron monuments at all lot and block corners and at all other angle points on property lines. Iron monuments must be placed after all site and right-of-way grading has been completed in order to preserve the lot markers for future property owners. 38. The developer shall contact the electric, telephone, gas, and cable companies that are authorized to provide service to the property to ascertain whether any of those utility pro- viders intend to install underground lines within the development. Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 12 of 16 39. The developer is responsible for all street maintenance; upkeep and repair of curbs, boule- vards, and sod; and street sweeping until the project is complete. All streets must be main- tained free of debris and soil until the subdivision is completed. Warning signs shall be placed when hazards develop in streets to prevent the public from traveling on said street(s) and directing them to detour routes. If and when the street becomes impassible, such streets shall be barricaded and closed. In the event residences are occupied prior to completing streets, the developer must maintain a smooth driving surface and adequate drainage on all streets until they are completed and accepted by the City. The developer hereby agrees to indemnify and hold the City harmless from any and all claims for damages of any nature whatsoever arising out of developer’s acts or omissions in performing the obligations imposed upon developer by this paragraph. 40. The developer will provide to the City copies of bids, change orders, test results, suppliers, subcontractors, etc., relating to the work to be performed by the developer. 41. The developer agrees to furnish to the City a list of contractors being considered for reten- tion by the developer for the performance of the work described in the development agreement. 42. The developer is responsible for the control of grass and weeds in excess of eight inches on vacant lots or boulevards within their development. Failure to control grass and weeds will be considered a developer’s default and the City may, at its option, perform the work and the developer shall promptly reimburse the City for any expense incurred by the City. 43. Developer is responsible to require each builder within the development to provide a Class 5 aggregate entrance for every house that is to be constructed in the development. This entrance is required to be installed upon initial construction of the home, but a paved drive- way must be completed before the City will issue a certificate of occupancy for that prop- erty. See City Standard Plate ERO-12 for construction requirements. The water service line and shut-off valve shall not be located in the driveway. 44. Developer will be required to conduct all major activities to construct the public improve- ments during the following hours of operation: Monday through Friday 7:00 A.M. to 7:00 P.M. Saturday 9:00 A.M. to 5:00 P.M. Sunday Not Allowed This does not apply to activities that are required on a 24-hour basis such as dewatering or bypass pumping, etc. Any deviations from the above hours are subject to approval of the City Engineer. Violations of the working hours will result in a $500 fine per occurrence. 45. The developer shall weekly, or more often if required by the City Engineer, clear from the public streets and property any soil, earth, or debris resulting from construction work by the developer or its agents or assigns. All debris, including brush, vegetation, trees, and dem- olition materials, shall be properly disposed of off-site; burying construction debris, trees, and other vegetation is prohibited. Burning of trees and structures is prohibited, except for fire training only. Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 13 of 16 46. The Developer grants the City, its agents, employees, officers, and contractors’ permission to enter the site to perform all necessary work and/or inspections during grading and the installation of public improvements by the developer. 47. Upon acceptance of the public improvements by the City Council, all responsibility for the improvements must be assumed by the City, except that the developer is subject to a one- year warranty on the construction of the improvements from the time of acceptance by the City of all public improvements. 48. The City will not have any responsibility with respect to any street or other public improve- ments unless the street or other public improvements have been formally accepted by the City. Upon completion of the improvements, the Developer may request, in writing, their acceptance by the City. This request must be accompanied by proof that there are no outstanding judgments or liens against the land upon which the public improvements are located. Upon the City’s receipt of a written request for acceptance from the Developer, the City Engineer will conduct a final inspection of the public improvements and will furnish a written list of any deficiencies noted. The City Engineer will base the inspection on com- pliance with the approved construction plans, profiles and specifications, as required by the city ordinance. Upon satisfactory completion of all construction in accordance with the approved plans, profiles, and specifications, as certified by a registered engineer in the State of Minnesota, and receipt of reproducible record drawings and satisfactory test re- sults, the City Engineer will notify the developer in writing of the City’s approval of the public improvements and schedule the request for acceptance for review by the City Council. 49. Upon completion of the work, the Developer shall provide the City with a full set of as-built plans for City records and transmitted to the City in a DWG Autocad format and pdf format. Developer must also furnish the City with a pdf format of the final plat and four prints of the recorded plat. If the Developer does not provide as-builts, the City will produce them at the developer’s expense. 50. The developer is responsible for completing the final grade on all lots and ensuring all boulevards and yards have a minimum of four inches of organic topsoil or black dirt on them. Placement of organic topsoil or black dirt, sod, and shrubs must not be transferred to homeowners. 51. Notwithstanding any other provision of this resolution to the contrary, the City will issue building permits for up to two (2) model homes on lots acceptable to the City upon Devel- oper’s compliance with the following requirements: a. Approval of a building plan and survey by the Chief Building Official. b. Presence of a paved road within three hundred feet (300’) and presence of a fire hydrant within one thousand feet (1,000’) of the model home(s). c. An unobstructed gravel surface road extension from a paved street surface to the pro- posed model home’s driveway. Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 14 of 16 d. No certificate of occupancy for such model homes shall be issued until all typical re- quirements for such issuance have been met. e. Final plat has been recorded. f. The Developer acknowledges in the development agreement that prior to the construc- tion of the improvements, site conditions, access to paved roads, and fire hydrants will be sub-standard and will not be optimized until the improvements are completed. To the fullest extent permitted by law, Developer agrees to indemnify the City, its officers, employees, agents and others acting on its behalf and to hold them harmless and de- fend and protect them (with counsel of the City’s choosing) from and against any and all loss, damage, liability, cost, and expense, specifically including attorneys’ fees and other costs and expenses of defense, which result from, or otherwise arise in connec- tion with any actions, claims or proceedings of any sort caused by or arising from the construction or use of the model homes by Developer or its contractors, employees, agents, or assigns, prior to the improvements being completed. Such claims shall in- clude, but not be limited to, claims that the model homes could not be accessed properly or in a timely manner by fire equipment and/or police or emergency vehicles due to road or site conditions or claims based on lack of proximity to fire hydrants or lack of adequate fire protection. Although indemnification shall cease for claims arising after the improvements are completed and accepted, indemnification obligations for claims arising prior to the completion of the Improvements shall survive the termination of the agreement. 52. No additional building permits beyond the model permits will be issued until such time as adequate public utilities, including streetlights, and streets have been installed and deter- mined to be available to use. The City will require that the utilities, lighting, and street sys- tem have been constructed and considered operational prior to issuance of any building permits in the development. Also, the City must have all the necessary right-of-way and/or easements needed for the property to be serviced. 53. Adequate dumpsters must be on site during construction of streets, utilities, and houses. When the dumpsters are full, they must be emptied immediately or replaced with an empty dumpster. The developer is responsible to require each builder to provide an on-site dump- ster to contain all construction debris, thereby preventing it from being blown off-site. 54. Adequate portable toilets must be on-site at all times during construction of utilities, road- ways, and houses. At no time shall any house under construction be more than 250 feet away from any portable toilet. Toilets must be regularly emptied. 55. After the site is rough graded, but before any utility construction commences or building permits are issued, the erosion control plan shall be implemented by the developer and inspected and approved by the City. The City may impose additional erosion control re- quirements if it is determined that the methods implemented are insufficient to properly control erosion. 56. All areas disturbed by the excavation and back-filling operations shall be fertilized, mulched, and disc anchored as necessary for seed retention. Time is of the essence in Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 15 of 16 controlling erosion. If the developer does not comply with the erosion control plan and schedule, or supplementary instructions received from the City, or in an emergency deter- mined at the sole discretion of the City, the City may take such action as it deems appro- priate to control erosion immediately. The City will notify the developer in advance of any proposed action, but failure of the City to do so will not affect the Developer’s and the City’s rights or obligations. If the developer does not reimburse the City for any costs of the City incurred for such work within thirty (30) days, the City may draw down the letter of credit to pay such costs. 57. The Developer is responsible for erosion control inspection fees at the current rates. If the developer does not reimburse the City for the costs the City incurred for such work within thirty (30) days, the City may draw down the letter of credit to pay such costs. 58. Dust control measures must be in place to prevent dust and erosion, including, but not limited to daily watering, silt fences, and seeding. The City Engineer may impose reason- able measures to reduce dust at the site. 59. The Developer shall comply with the 1991 Wetlands Conservation Act, as amended. 60. It is the Developer’s responsibility to keep active and up to date the developer’s contract and financial surety (e.g. Letter of Credit, etc.). These documents must remain active until the developer has been released from any further obligation by City Council motion received in writing from the City Engineer. 61. The Developer must provide to the City an irrevocable letter of credit for on-site improve- ments to ensure that the developer will construct or install and pay for the following: a. Paved streets b. Concrete curb and gutter c. Hard surface driveways d. Streetlights e. Water system (trunk and lateral) and water house service stubs f. Sanitary sewer system (trunk and lateral) and sanitary house service stubs g. Storm sewer system h. Street and traffic control signs i. Shaping and sodding drainage ways and emergency overflows in accordance with the drainage development plan approved by the City Engineer j. Adjust and repair new and existing utilities Planning Staff Report – Ravine Meadows Case Nos. ZA2019-046 and PP2019-047 September 23, 2019 Page 16 of 16 k. Erosion control, site grading and ponding l. Surveying and staking m. Park and open space boundary markers (5) n. These improvements are all in conformance with City approved plans and specifications and will be installed at the sole expense of the developer in conformance with City Code Title 10, Chapter 5. o. The bank and form of the security is subject to the reasonable approval of the City. The security shall be automatically renewing. The term of the security may be extended from time to time if the extension is furnished to the City at least forty-five (45) days prior to the stated expiration date of the security. If the required public improvements are not completed, or terms of the Development Agreement are not satisfied, at least thirty (30) days prior to the expiration of a letter of credit, the City may draw down the letter of credit. The City may draw down the security without prior notice for any default of the development agreement. The minimum amount for this financial guarantee will be included in the development agreement. 62. The Developer must post a cash escrow with the City’s Finance Director to cover engineer- ing, legal, and administrative costs incurred by the City. If this non-interest bearing account balance becomes deficient, the Developer must deposit additional funds. This must be done before final bonding obligations are complete. This escrow amount will be included in the development agreement. 63. The Developer must post a cash escrow with the City’s Finance Director to cover engineer- ing costs and other City services, expenses, and materials provided in reviewing and pro- cessing of the final plat, including but not limited to staff time, legal expenses, office and field inspections, general inspections, and all other city staff services performed. This es- crow amount will be included in the development agreement. 64. The Developer is responsible for establishing the final grades, topsoil, and seeding of all the residential lots and boulevards within the subdivision. The developer and/or builder is responsible for planting the one boulevard tree per lot and a second boulevard tree on the corner side lot for corner lots after homes are constructed. The City Forester will mark the location where the boulevard tree must be planted and approve the tree species to be planted. The final landscape plan must be coordinated with the City Forester. Prepared by: Attachments: Exhibit A – Preliminary Plat John M. Burbank, AICP Exhibit B – Preliminary Civil Drawings Senior Planner Exhibit C – Engineering Review Memorandum 09/13/2019 UJUMF!TIFFU DJWJM!BOE!MBOETDBQF zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn zz/ee/nn :2/93/91 SBWJOF!NFBEPXT /T!!!!!!!!!!! !!!!!!!!!!!!!!!!/F WB TUBFL /FW B /TBDJBNBK /T!!/FW B!!EPPXOJ /T!!!!!!!!!!!!/FO WBPUOJI :213NSPGEOBM d QMBU QSFMJNJOBSZ 71/1 21 21 21 21 21 21 :213NSPGEOBM d '!EFNPMJUJPO FYJTUJOH!DPOEJUJPOT ?? J ? ? ? ? J J J J J FY/!23#!EJQFY/!23#!EJQ ?? :213NSPGEOBM d 2019LANDFORM c 4.5% C3.1 C3.1 A A •• •• •• •• •• •• •• •• •• •• •• •• •• •• 2019LANDFORM c RCH REVIEW 13 / 6 TBD19001 C32TBD001.DWG Date: SHEET NO. PROJECT TEL 612-202-3582 DEVELOPER MUNICIPALITY C3.2 CERTIFICATION are registered service marks of Landform Professional Services, LLC. ISSUE / REVISIONPRELIM. PLAT SUBMITTAL MN SWPPP NOTES AUGUST 28, 2019 CONTACT ENGINEER FOR ANY PRIOR HISTORY 2242 COTTAGE GROVE ALCOVEWOODBURY, MINNESOTA 55129 ISSUE / REVISION HISTORY THE ENGINEER TO REQUEST ADDITIONAL DOCUMENTS. and Site to Finish VISIBLE, THIS SHEET HAS BEEN REPRODUCED BEYOND INTENDED IF THE SIGNATURE, SEAL OR FOUR LINES DIRECTLY ABOVE ARE NOT READABILITY AND IS NO LONGER A VALID DOCUMENT. PLEASE CONTACT I hereby certify that this plan was prepared by me, or under my directsupervision, and that I am a duly Licensed Professional Engineer underthe laws of the state of MINNESOTA.Randall C. HedlundLicense No:Signature shown is a digital reproduction of original. Wet signed copy ofthis plan on file at Landform Professional Services, LLC office and isavailable upon request. DATE FILE NAMEPROJECT NO.Landform 28 AUG 2019 SHEETS FOR POST CONSTRUCTION AND PERMANENT FINAL STABILIZATION TERMINATION OF COVERAGE INSPECTIONS AND MAINTENANCE TEMPORARY SEDIMENTATION BASIN(S) RECORDKEEPING / RECORD RETENTION POST CONSTRUCTION / PERMANENT BMPS LOG OF CHANGES TO THE SWPPP / AMENDMENTS AND PROPERLY DISPOSE OF SEDIMENT INTO CONTROLLED AREAS TO PREVENT SOIL FROM RETURNING TOTHE BMP DURING SUBSEQUENT RAIN EVENTS.CONTRACTOR WORK AREAS, AND MATERIAL STORAGE AREAS AND DEDICATED CONCRETE AND ASPHALT FOLLOW THE DESIGNER'S OR MANUFACTURER'S RECOMMENDED MAINTENANCE PROCEDURES FOR ALLBMPS.REMOVE SEDIMENT FROM BMPS WHEN THE DEPTH OF SEDIMENT HAS REACHED 1/2 THE HEIGHT OF THE BMPREMOVE SEDIMENT FROM PAVED ROADWAYS AND FROM AROUND BMPS PROTECTING STORM DRAIN INLETS.ENSURE THAT CONSTRUCTION SUPPORT ACTIVITIES, INCLUDING BORROW AREAS, WASTE AREAS,BATCH PLANTS ARE CLEANED AND MAINTAINED.REPLACE DAMAGED BMPS THAT NO LONGER OPERATE EFFECTIVELY. VOLUME. (WHERE NO CALCULATION HAS BEEN PERFORMED, EACH BASIN SHALL PROVIDE AT LEAST 3,600ANY OTHER PERMITS REQUIRED FOR THE PROJECTALL PERMANENT OPERATION AND MAINTENANCE AGREEMENTS THAT HAVE BEEN IMPLEMENTED, INCLUDINGALL RIGHT OF WAY, CONTRACTS, COVENANTS AND OTHER BINDING REQUIREMENTS REGARDING PERPETUALALL REQUIRED CALCULATIONS FOR DESIGN OF THE TEMPORARY AND PERMANENT STORM WATER SEDIMENTATION BASINS MUST PROVIDE LIVE STORAGE OF RUNOFF RESULTING FROM THE 2-YR 24-HRRAINFALL EVENT FROM EACH ACRE DRAINED TO THE BASIN WITH A MINIMUM OF 1,800 CF/ACRE LIVE STORAGECF/ACRE OF LIVE STORAGE.) SEDIMENTATION BASINS MUST INCLUDE A STABILIZED EMERGENCY OVERFLOWTO PREVENT BASIN INTEGRITY FAILURE.DISCHARGE FROM TEMPORARY SEDIMENTATION BASINS WILL BE WITHDRAWN FROM THE SURFACE IN ORDERTO MINIMIZE THE DISCHARGE OF POLLUTANTS.COPY OF THE SWPPP, WITH ANY MODIFICATIONSINSPECTION AND MAINTENANCE RECORDSPERMANENT OPERATION AND MAINTENANCE AGREEMENTSCALCULATIONS FOR THE DESIGN OF TEMPORARY AND PERMANENT STORM WATER MANAGEMENT SYSTEMSRECORDS OF ALL INSPECTION AND MAINTENANCE CONDUCTED DURING CONSTRUCTIONMAINTENANCE; ANDMANAGEMENT SYSTEMS. A.B. THAN 0.5-INCH IN 24 HOURS.CONDUCTED AS DETAILED IN THE PERMIT.ADD BMPs AS NEEDED DURING CONSTRUCTION TO MINIMIZE EROSION AND PREVENT SEDIMENT FROM LEAVING THESITE. PERMITTEES MUST ENSURE A TRAINED PERSON WILL INSPECT THE ENTIRE CONSTRUCTION SITE AT LEAST ONCEEVERY SEVEN (7) DAYS DURING ACTIVE CONSTRUCTION AND WITHIN 24 HOURS AFTER A RAINFALL EVENT GREATERINSPECTIONS SHALL INCLUDE STABILIZED AREAS, EROSION PREVENTION AND SEDIMENT CONTROL BMPS, ANDINFILTRATION AREAS.PERMITTEES MUST RECORD ALL INSPECTIONS AND MAINTENANCE ACTIVITIES WITHIN 24 HOURS OF BEINGBMP MAINTENANCE: ANY DISCHARGE OBSERVED TO BE OCCURRING DURING THE INSPECTION SHALL BE RECORDED, DESCRIBED, ANDASSISTANCE TOOLKIT FOR SMALL CONSTRUCTION OPERATORS", MPCA, 2017 FOR ADDITIONAL INFORMATION.SEE GRADING AND DRAINAGE, UTILITY, AND LANDSCAPEALL OWNER(S) MUST KEEP THE SWPPP, ALONG WITH THE FOLLOWING ADDITIONAL RECORDS, ON FILE FOR THREE (3)YEARS AFTER SUBMITTAL OF THE NOTICE OF TERMINATION (NOT). THIS DOES NOT INCLUDE ANY RECORDS AFTER AS DETAILED IN THE PERMIT. THIS PROJECT DOES NOT HAVE MORE THAN 10 ACRES DRAINING TO A COMMON LOCATION AND THE SITE DOES NOTDRAIN TO AN IMPAIRED OR SPECIAL WATER, THEREFORE A TEMPORARY SEDIMENT BASIN IS NOT REQUIRED.TEMPORARY SEDIMENT BASINS SHALL PROVIDE TREATMENT TO RUNOFF BEFORE IT LEAVES THE CONSTRUCTIONSITE OR ENTERS SURFACE WATERS. THE CONTRACTOR SHALL COMPLY WITH THE FOLLOWING REQUIREMENTS:DISCH ARGE FROM BASIN DRAINING SHALL NOT ADVERSELY AFFECT THE RECEIVING WATER OR DOWNSTREAMPROPERTIES. CONTRACTOR WILL VISUALLY CHECK TO ENSURE ADEQUATE TREATMENT HAS BEEN OBTAINED ANDTHAT NUISANCE CONDITIONS WILL NOT RESULT FROM THE DISCHARGE.PHOTOGRAPHED.IF ANY PROPOSED TEMPORARY BMPS ARE NOT WORKING AS PLANNED REFER TO THE "STORMWATER COMPLIANCEOPERATOR SHALL CONTACT THE SWPPP DESIGNER FOR ADDITIONAL REQUIREMENTS AND INFORMATION.STORMWATER BMPS.THE SWPPP (ORIGINAL OR COPIES) INCLUDING, ALL CHANGES TO IT, AND INSPECTIONS AND MAINTENANCE RECORDSSHALL BE KEPT AT THE SITE DURING CONSTRUCTION BY THE OWNER / OPERATOR WHO HAS OPERATIONAL CONTROLOF THAT PORTION OF THE SITE. THE SWPPP CAN BE KEPT IN EITHER THE FIELD OFFICE OR IN AN ON SITE VEHICLEDURING NORMAL WORKING HOURS.SUBMITTAL OF THE NOT.THE FOLLOWING IS A LIST OF RECORDS THAT SHALL BE KEPT AT THE PROJECT SITE AVAILABLE FOR INSPECTORS TOREVIEW:SUCH AS ADDITIONAL OR MODIFIED BMPS, DESIGNED TO CORRECT PROBLEMS IDENTIFIED OR ADDRESS SITUATIONSOWNER / OPERATOR(S) WISHING TO TERMINATE COVERAGE UNDER THIS PERMIT MUST SUBMIT A NOTICE OF THE OWNER / OPERATOR(S) MUST AMEND THE SWPPP AS NECESSARY TO INCLUDE ADDITIONAL REQUIREMENTS,THE OWNER / OPERATOR(S) MUST ENSURE FINAL STABILIZATION OF THE SITE. FINAL STABILIZATION AS DEFINED INTHE PERMIT.TERMINATION (NOT) TO THE MPCA. COMPLIANCE WITH THIS PERMIT IS REQUIRED UNTIL A NOT IS SUBMITTED. REFERTO THE PERMIT FOR DETAILS. 2.3.4.5.2.3.4.5.2.3.1. 1.1.1.1.1.1. STABILIZATION MUST BE STARTED EROSION PREVENTION AND SEDIMENT CONTROL APPROPRIATE CONSTRUCTION PRACTICES (E.G. CONSTRUCTION PHASING, VEGETATIVE BUFFER STRIPS,AREAS NOT TO BE DISTURBED (BUFFERS, INFILTRATION BASINS, ETC.) SHALL BE PROTECTED WITH CONSTRUCTIONAREAS AND UTILITY TRENCHES AND SHALL USE TRACKED EQUIPMENT WHEREVER PRACTICABLE.TOPSOIL SHALL BE SALVAGED AND REUSED TO THE EXTENT PRACTICABLE.THE TIMING OF THE INSTALLATION OF SEDIMENT CONTROL PRACTICES MAY BE ADJUSTED TO ACCOMMODATETHE NORMAL WETTED PERIMETER OF ANY TEMPORARY OR PERMANENT DRAINAGE DITCH OR SWALE THAT DRAINSWATER FROM ANY PORTION OF THE CONSTRUCTION SITE, OR DIVERTS WATER AROUND THE SITE, SHALL BETHE DITCH HAS TEMPORARILY OR PERMANENTLY CEASED.TEMPORARY OR PERMANENT DITCHES OR SWALES THAT ARE BEING USED AS A SEDIMENT CONTAINMENT SYSTEMTHESE AREAS SHALL BE STABILIZED WITHIN 24 HOURS AFTER NO LONGER BEING USED AS A SEDIMENTALL EXPOSED SOIL AREAS, INCLUDING STOCKPILES, MUST BE STABILIZED. TEMPORARILY OR PERMANENTLY CEASED AND WILL NOT RESUME FOR 14 CALENDAR DAYS.TEMPORARY SOIL STOCKPILES SHALL HAVE SILT FENCE OR OTHER EFFECTIVE SEDIMENT CONTROLS, AND CANNOTTEMPORARY STOCKPILES WITHOUT SIGNIFICANT SILT, CLAY OR ORGANIC COMPONENTS (E.G., CLEAN AGGREGATEALL STORM DRAIN INLETS SHALL BE PROTECTED BY APPROPRIATE BMPS DURING CONSTRUCTION UNTIL ALLTEMPORARILY REMOVED IF A SPECIFIC SAFETY CONCERN HAS BEEN IDENTIFIED.AFTER CONNECTION TO A SURFACE WATER OR PERMANENT STORMWATER TREATMENT SYSTEM.APPROPRIATE BMP PRIOR TO ENTERING THE SURFACE WATER.ADEQUATELY PROTECTED FROM EROSION AND SCOUR BY ACCEPTED ENERGY DISSIPATION MEASURES.VEHICLE TRACKING PADS SHALL BE ESTABLISHED AS SHOWN ON THE GRADING, DRAINAGE, PAVING AND EROSIONWHEN EXCAVATING AN INFILTRATION SYSTEM TO WITHIN THREE FEET OF FINAL GRADE, OPERATOR SHALL MARK OFFAND PROTECT THE AREA FROM HEAVY CONSTRUCTION EQUIPMENT TO PREVENT COMPACTION OF SOILS.TO A TEMPORARY OR PERMANENT SEDIMENT BASIN. DISCHARGES MUST NOT CAUSE EROSION OR SCOUR NEAR THE SEE GRADING, DRAINAGE, PAVING AND EROSION CONTROL SHEETS FOR THE LOCATION AND TYPE OF TEMPORARYEROSION PREVENTION AND SEDIMENT CONTROL BMPS. SEE GRADING AND DRAINAGE, UTILITY, AND LANDSCAPESHEETS FOR THE LOCATION AND TYPE OF PERMANENT EROSION PREVENTION AND SEDIMENT CONTROL BMPS.MINIMIZE DISTURBED AREAS AND PROTECT NATURAL FEATURES AND SOILHORIZONTAL SLOPE GRADING) SHALL BE USED TO MINIMIZE EROSION.OR SILT FENCE BEFORE WORK BEGINS.OPERATOR SHALL DEVELOP METHODS TO MINIMIZE SOIL COMPACTION OUTSIDE OF BUILDING PADS, PAVEMENTPHASE CONSTRUCTION ACTIVITYOPERATOR MUST NOT DISTURB MORE LAND THAN CAN BE EFFECTIVELY INSPECTED AND MAINTAINED.SEDIMENT CONTROL PRACTICES SHALL BE ESTABLISHED ON ALL DOWN GRADIENT PERIMETERS BEFORE ANYUPGRADIENT LAND DISTURBING ACTIVITIES BEGIN. THESE PRACTICES SHALL REMAIN IN PLACE UNTIL FINALSTABILIZATION HAS BEEN ESTABLISHED IN ACCORDANCE WITH THE PERMIT.SHORT-TERM ACTIVITIES SUCH AS CLEARING OR GRUBBING, OR PASSAGE OF VEHICLES. ANY SHORT-TERM ACTIVITYMUST BE COMPLETED AS QUICKLY AS POSSIBLE AND THE SEDIMENT CONTROL PRACTICES SHALL BE INSTALLEDIMMEDIATELY AFTER THE ACTIVITY IS COMPLETED. HOWEVER, SEDIMENT CONTROL PRACTICES SHALL BE INSTALLEDBEFORE THE NEXT PRECIPITATION EVENT EVEN IF THE ACTIVITY IS NOT COMPLETE.CONTROL STORM WATER FLOWING ONTO AND THROUGH THE PROJECTSTABILIZED WITHIN 200 LINEAL FEET FROM THE PROPERTY EDGE, OR FROM THE POINT OF DISCHARGE INTO ANYSURFACE WATER.STABILIZATION OF THE LAST 200 LINEAL FEET SHALL BE COMPLETED WITHIN 24 HOURS AFTER CONNECTING TO ASURFACE WATER.STABILIZATION OF THE REMAINING PORTIONS OF ANY TEMPORARY OR PERMANENT DITCHES OR SWALES SHALL BECOMPLETE WITHIN 14 DAYS AFTER CONNECTING TO A SURFACE WATER AND CONSTRUCTION IN THAT PORTION OF(WITH PROPERLY DESIGNED ROCK DITCH CHECKS, BIO ROLLS, SILT DIKES ETC.) DO NOT NEED TO BE STABILIZED.CONTAINMENT SYSTEM.STABILIZE SOILSIMMEDIATELY TO LIMIT SOIL EROSION WHEN THE CONSTRUCTION ACTIVITY IN THAT PORTION OF THE SITE HASSTABILIZATION MUST BE COMPLETED WITH IN 14 CALENDAR DAYS OF CESSATION OF CONSTRUCTION ACTIVITY.BE PLACED IN SURFACE WATERS, INCLUDING STORM WATER CONVEYANCES SUCH AS CURB AND GUTTER SYSTEMS,OR CONDUITS AND DITCHES UNLESS THERE IS A BYPASS IN PLACE FOR THE STORM WATER.STOCKPILES, DEMOLITION CONCRETE STOCKPILES, SAND STOCKPILES) AND THE CONSTRUCTED BASE COMPONENTSOF ROADS, PARKING LOTS AND SIMILAR SURFACES ARE EXEMPT FROM THIS REQUIREMENT.PROTECT SLOPESOPERATOR SHALL AVOID WORK ON SLOPES WITH A GRADE OF 3:1 OR GREATER WHEN PRACTICABLE. GRADING ONSLOPES WITH A GRADE OF 3:1 OR STEEPER WILL REQUIRE TECHNIQUES SUCH AS PHASING AND STABILIZATIONPRACTICES DESIGNED FOR STEEP SLOPES (E.G., SLOPE DRAINING AND TERRACING).PROTECT STORM DRAIN INLETSSOURCES WITH POTENTIAL FOR DISCHARGING TO THE INLET HAVE BEEN STABILIZED. INLET PROTECTION MAY BEPROVIDE ENERGY DISSIPATION AT ALL PIPE OUTLETS WITHIN 24 HOURSESTABLISH PERIMETER CONTROLS AND SEDIMENT BARRIERSPRIOR TO DISTURBING SOILS ON A PROJECT SITE, ESTABLISH SEDIMENT CONTROL BMPS ON ALL DOWNGRADIENTPERIMETERS AND WHERE SITE DISCHARGES TO PUBLIC WATERS.RETAIN SEDIMENT ON-SITE AND CONTROL DEWATERING PRACTICESDEWATERING OR BASIN DRAINING OF TURBID OR SEDIMENT LADEN WATER RELATED TO CONSTRUCTION ACTIVITIESSHALL BE DISCHARGED TO A TEMPORARY OR PERMANENT SEDIMENTATION BASIN OR TREATED WITH THEDISCHARGE SHALL NOT CAUSE NUISANCE CONDITIONS, EROSION IN RECEIVING CHANNELS, ADVERSELY AFFECTRECEIVING WATER OR IMPACT WETLANDS, OR DOWNSTREAM PROPERTIES. DISCHARGE POINTS SHALL BEDISCHARGE WATER CONTAINING OIL OR GREASE SHALL BE TREATED TO REMOVE OIL OR GREASE PRIOR TODISCHARGE TO SURFACE WATERS.REFER TO PERMIT REQUIREMENTS FOR TEMPORARY OR PERMANENT SEDIMENT BASINS.ESTABLISH STABILIZED CONSTRUCTION EXITSCONTROL SHEET TO MINIMIZE TRACKING OF SEDIMENT FROM THE CONSTRUCTION SITE ONTO ADJACENT STREETS.INFILTRAION BASIN PROTECTIONOPERATOR MUST NOT EXCAVATE INFILTRATION SYSTEMS TO FINAL GRADE OR WITHIN THREE FEET OF FINAL GRADEUNTIL THE CONTRIBUTING DRAINAGE AREA HAS BEEN CONSTRUCTED AND FULLY STABILIZED UNLESS RIGOROUSEROSION PREVENTION AND SEDIMENT CONTROLS HAVE BEEN INSTALLED.DEWATERING AND BASIN DRAININGPERMITTEES MUST DISCHARGE TURBID OR SEDIMENT-LADEN WATERS RELATED TO DEWATERING OR BASIN DRAININGDISCHARGE POINTS. 1.2.3.4.5.6.7.8.9.10.11.12.13. 1 MILE WATERS WITHIN ONE MILE OF SITE DESCRIPTION OF CONSTRUCTION ACTIVITY STORMWATER POLLUTION MITIGATION MEASURES FILTRATION BASINSNURP PONDPROJECT SITE IS LOCATED WITHIN THE EAST RAVINE DRAINAGE (ER-A2) SCHEDULE OF BMP INSTALLATION AND CONSTRUCTION ACTIVITY MN SPECIAL (PROHIBITED, RESTRICTED, OTHER) & IMPAIRED WATERS CONSTRUCTION ACTIVITY INCLUDES EROSION AND SEDIMENT CONTROL BMPS INSTALLATION, CLEARING AND24-HOURS OF EXCAVATING AN INFILTRATION BASIN.CONSTRUCT PERMANENT SEDIMENTATION BASINS PRIOR TO UPLAND DISTURBANCE. INSTALL PERIMETER SEDIMENTCONTROL BMPS AROUND NORMAL WATER LEVELS WITHIN 48-HOURS OF COMPLETION OF BASIN GRADING.STABILIZE OUTLETS FROM PERMANENT SEDIMENTATION BASINS WITHIN 24-HOURS OF OUTLET CONSTRUCTION.STRIP TOPSOIL FROM AREAS TO BE DISTURBED AND STOCKPILE WITH PERIMETER SEDIMENT CONTROL BMPS.CONSTRUCT BUILDING / ADDITION AND SITE FEATURES.CONSTRUCT SITE WALKS AND PATIOS.CONNECT INFILTRATION / FILTRATION PRACTICES TO STORM SEWER INLETS. GRUBBING, SITE GRADING, UTILITY INSTALLATION, BUILDING CONSTRUCTION, PAVING, AND LANDSCAPING.INSTALL PERIMETER SEDIMENT CONTROL BMPS PRIOR TO START OF OTHER SITE WORK. REFER TO GRADING,DRAINAGE, PAVING AND EROSION CONTROL SHEET(S) FOR INITIAL LOCATIONS OF BMPS.PROTECT FILTRATION AREAS WITH CONSTRUCTION FENCING. INSTALL FENCING PRIOR TO SITE GRADING OR WITHINPERFORM WORK IN PHASES TO MINIMIZE DISTURBED AREA AT ANY ONE TIME. OPERATOR TO DEVELOP PHASING PLANPRIOR TO START OF WORK.PROVIDE STABILIZATION IF STOCKPILE IS LEFT LONGER THAN 14 DAYS.ROUGH GRADE SITE.INSTALL UTILITIES.INSTALL SMALL UTILITIES (GAS, ELECTRIC, COMMUNICATIONS).FINAL GRADE PAVEMENT AREAS AND COMPACT SUBGRADE.LAY DOWN PAVEMENT AGGREGATE AND COMPACT.INSTALL CURB AND GUTTER. BACKFILL AFTER A MINIMUM OF THREE DAYS AND PROVIDE A MINIMUM OF TWO ROLLSOF SOD AT THE BACK OF CURB.PROVIDE FINAL STABILIZATION.REMOVE TEMPORARY BMPS AND DISPOSE OF PROPERLY.REQUIRED MEASURES TO MEET THE FINAL ENVIRONMENTAL REVIEW DOCUMENT ARE: 4. 1.1.2.3.5.6.7.8.9.10.11.12.13.14.15.16.17.1.1. SITE INFORMATION PLAN / NARRATIVE / REPORT PREPARED BY LANDFORM NPDES PERMIT AND SWPPP COMPONENTS SITE EVALUATION / ASSESSMENT / PLANNING SWPPP CONTACT AND TRAINING INFORMATION IMPLEMENTING PROMPT AND EFFECTIVE EROSION AND SEDIMENT CONTROL MEASURESIMPLEMENTING ALL NON-STORM WATER MANAGEMENT, AND GOOD HOUSEKEEPING BMPS ENSURINGTHAT NO MATERIALS OTHER THAN STORM WATER ARE DISCHARGED IN QUANTITIES, WHICH WILL HAVEAN ADVERSE EFFECT ON RECEIVING WATERS OR STORM DRAIN SYSTEMS, ETC. CONDUCTING ROUTINE INSPECTIONS AND MAINTENANCECOORDINATING TO ENSURE ALL OF THE NECESSARY CORRECTIONS / REPAIRS ARE MADE IMMEDIATELY, ANDTHAT THE PROJECT COMPLIES WITH THE SWPPP, THE PERMIT, AND APPROVED PLANS AT ALL TIMES.THONE BUILDERS AND DEVELOPERS, INC.2242 COTTAGE GROVE ALCOVEWOODBURY, MINNESOTA 55129612-202-3582CONTACT: TIM THONETO BE DETERMINED. CONTACT OWNER UNTIL CONTRACTOR IS SELECTED.TO BE DETERMINED. CONTACT OWNER UNTIL CONTRACTOR IS SELECTED.612-252-9070CERTIFICATION: U OF MN, DESIGN OF CONSTRUCTION SWPPP, EXP. MAY 31, 2022TO BE DETERMINED. CONTACT OWNER UNTIL CONTRACTOR AND SWPPP INSPECTOR / MANAGER IS SELECTED.CERTIFICATION: , EXP.TO BE DETERMINED. CONTACT OWNER UNTIL BMP INSTALLER AND MAINTAINER IS SELECTED.CERTIFICATION: , EXP. ENSURING FULL COMPLIANCE WITH THE SWPPP AND THE PERMITIMPLEMENTING ALL ELEMENTS OF THE SWPPP, INCLUDING BUT NOT LIMITED TO:ENSURING ELIMINATION OF ALL UNAUTHORIZED DISCHARGESRANDY HEDLUND, P.E.LANDFORM PROFESSIONAL SERVICES105 SOUTH FIFTH AVENUE, SUITE 513MINNEAPOLIS, MN 55401RHEDLUND@LANDFORM.NET CONSTRUCTION DOCUMENTS PREPARED BY LANDFORMSTORMWATER MANAGEMENTMAINTENANCE PLAN FOR PERMANENT STORMWATER BMPSGEOTECHNICAL REPORT PREPARED BY XXXXNURPFILTRATION STORMWATER POLLUTION PREVENTION MANAGEMENT MEASURES REFERENCED IN THIS DOCUMENT AS THE PERMIT.THE SWPPP INCLUDES THE FOLLOWING COMPONENTS:ALL COMPONENTS MUST BE KEPT ONSITE BY THE OPERATOR. THE OPERATOR SHALL CONTACT CIVIL ENGINEER IF SITE LOCATION: LATITUDE: 44.85666, LONGITUDE: -92.91694TYPE OF STORMWATER MANAGEMENT:THE OPERATOR SHALL HAVE PRIMARY RESPONSIBILITY AND SIGNIFICANT AUTHORITY FOR THE DEVELOPMENT,ARE NOT LIMITED TO:BMPS, MUST FOLLOW ALL APPLICABLE FEDERAL, STATE, AND LOCAL BUILDING CODES, OCCUPATIONAL SAFETY ANDHEALTH ACT (OSHA), AND THE GENERAL CONDITIONS AND GENERAL REQUIREMENTS OF THE CONSTRUCTION THE OPERATOR SHALL MINIMIZE THE EXPOSURE TO STORMWATER OF ANY OF THE PRODUCTS, MATERIAL, ORWASTES STORED ON SITE THAT MAY WASH DOWNSTREAM OR CONTAIMINATE STORMWATER.CHEMICALS AND LANDSCAPE MATERIALS SHALL BE UNDER COVER TO PREVENT THE DISCHARGE OF POLLUTANTS.OPERATOR TO TRACK PROGRESS OF THE FOLLOWING ITEMS ON SITE MAPS: PORTABLE TOILETS, MATERIAL STORAGEAREAS, VEHICLE AND EQUIPMENT FUELING AND MAINTENANCE AREAS, CONCRETE WASHOUTS, PAINT AND STUCCOWASHOUTS, DUMPSTERS OR OTHER TRASH AND DEBRIS CONTAINERS, SPILL KITS, STOCKPILES, ANY OTHERCHANGES TO THE STRUCTURAL BMPS.SOLID WASTE: COLLECTED SEDIMENT, ASPHALT AND CONCRETE MILLINGS, FLOATING DEBRIS, PAPER, PLASTIC,COMPLY WITH MPCA DISPOSAL REQUIREMENTS.SEALED CONTAINERS TO PREVENT SPILLS, LEAKS OR OTHER DISCHARGE. RESTRICTED ACCESS TO STORAGE AREASCONCRETE AND OTHER WASHOUT WASTE: OPERATOR MUST PROVIDE EFFECTIVE CONTAINMENT FOR ALL LIQUIDAND SOLID WASTES GENERATED BY WASHOUT OPERATIONS. THE LIQUID AND SOLID WASTES MUST NOT CONTACTTHE GROUND, AND THE CONTAINMENT MUST BE DESIGNED SO THAT IT DOES NOT RESULT IN RUNOFF FROM THEWASHOUT OPERATIONS OR AREAS. LIQUID AND SOLID WASTES MUST BE DISPOSED OF PROPERLY AND INCOMPLIANCE WITH MPCA RULES. A SIGN MUST BE INSTALLED ADJACENT TO EACH WASHOUT FACILITY THATWASHOUT WASTES.OPERATOR SHALL TAKE REASONABLE STEPS TO PREVENT THE DISCHARGE OF SPILLED OR LEAKED CHEMICALS,OWNER:OPERATOR:SWPPP DESIGNER:SWPPP INSPECTOR / MANAGER: THE CURRENT MINNESOTA CONSTRUCTION STORMWATER GENERAL PERMIT (PERMIT) DATED AUGUST 1, 2022 ISTHEY DO NOT HAVE ALL OF THE ABOVE DOCUMENTS.DISTURBED AREA = 9.85 AC.PRE-CONSTRUCTION IMPERVIOUS AREA WITHIN DISTURBED AREA = 0.682 AC.POST-CONSTRUCTION IMPERVIOUS AREA WITHIN DISTURBED AREA = 3.300 AC.NET CHANGE IN IMPERVIOUS AREA WITHIN DISTRUBED AREA = 2.618 AC.EROSION PREVENTION AND SEDIMENT CONTROL QUANTITIES ARE ON SHEETS C3.1IMPLEMENTATION, MAINTENANCE, INSPECTION AND AMENDMENTS TO THE APPROVED SWPPP. DUTIES INCLUDE BUT OPERATOR MUST DEVELOP POLLUTION PREVENTION MANAGEMENT MEASURES, IMPLEMENT GOOD HOUSEKEEPINGCONTRACT.BUILDING PRODUCTS THAT HAVE THE POTENTIAL TO LEACH POLLUTANTS MUST BE UNDER COVER.NON-STRUCTURAL NON-STORM WATER MANAGEMENT BMPS, ANY TEMPORARILY REMOVED STRUCTURAL BMPS, ANYFABRIC, CONSTRUCTION AND DEMOLITION DEBRIS AND OTHER WASTES MUST BE DISPOSED OF PROPERLY AND MUSTHAZARDOUS WASTE: OIL, GASOLINE, PAINT AND ANY HAZARDOUS SUBSTANCES MUST BE PROPERLY STORED INMUST BE PROVIDED TO PREVENT VANDALISM. STORAGE AND DISPOSAL OF HAZARDOUS WASTE OR MATERIALS MUSTBE IN COMPLIANCE WITH MINN. R. CH. 7045 INCLUDING SECONDARY CONTAINMENT AS APPLICABLE.PORTABLE TOILETS MUST BE POSITIONED SO THAT THEY ARE SECURE AND WILL NOT BE TIPPED OR KNOCKED OVER.REQUIRES SITE PERSONNEL TO UTILIZE THE PROPER FACILITIES FOR DISPOSAL OF CONCRETE AND OTHEREXTERNAL VEHICLE WASHING: EXTERNAL WASHING OF TRUCKS AND OTHER CONSTRUCTION VEHICLES MUST BELIMITED TO A DEFINED AREA OF THE SITE. RUNOFF MUST BE CONTAINED AND WASTE PROPERLY DISPOSED OF. NOENGINE DEGREASING IS ALLOWED ON SITE.INCLUDING FUEL, FROM ANY AREA WHERE THEY WILL BE LOADED OR UNLOADED AS DETAILED IN THE PERMIT.LONG TERM MAINTENANCE AND OPERATION:BMP INSTALLATION AND REPAIR: 2.4.2.4. 1.1.1.3.5.6.7.8.9.10.11.1.3.5.6. 2019LANDFORM c VUJMJUJFT ?? J ? ? ? ? J J J J J FY/!23#!EJQFY/!23#!EJQ ?? :213NSPGEOBM d 2019LANDFORM c 2019LANDFORM c 2019LANDFORM c 2019LANDFORM c MBOETDBQF!QMBO ?? J ? ? ? J J J J J ?? :213NSPGEOBM d MBOETDBQF!EFUBJMT TFJSBWOJN!#53 WBSJFT!QFS!TQFDJFT 5#!NJO/ 3 )TFF!QMBOT* FOJMQJSE FOJMQJSE :213NSPGEOBM d MEMORANDUM Date:09/13/2019 To:Ryan Burfeind, PE From:Mike Boex, PE Subject: Ravine Meadows Plan Review City of Cottage Grove, MN Project No.: N14.119528 This memo summarizes the review of both grading documents and street & utility documents submitted by Landform, dated 08/28/19 (received 09/04/19). Sheet C0.1: 1.Identify any benchmarks and the horizontal and vertical datums used on the project. 2.Note that the City of Cottage Grove’s Standard Specifications for Street and Utility Construction shall govern for all improvements on the project. Sheet C0.2: 3.Additional drainage & utility easement is required in the rear of lot 12 block 1 adjacent to the storm pipe from OCS 601 to the existing catch basin north of Ravine Parkway. Easement widths should be a minimum width of twice the depth of pipe centered on the pipe. In this case, 10’ from the storm pipe appears sufficient. All other easement widths will be confirmed during final design once design profiles are provided for the utilities. Sheet C2.1: 4.The bituminous trail should be removed from Outlot A and along Military Road. 5.The Outlot area should be revised to encompass the proposed pond high-water level area. The remainder of the lots along block 1 that are not adjacent to the pond can then be extended to the plat line. Sheet C3.1: 6.A plan/profile sheet shall be provided for the public street. 7.Provide a stop sign on Jeffery Avenue at Military Road. 8.The maximum grade approaching an intersection shall be 2.0% for 100-feet. 9.The minimum grade of greenspace drainage ways shall be 2%. The following do not appear to meet the 2% minimum requirement: a.The swale from the rear of lot 11 block 2 to the west and north b.The swale from the rear of lot 12 block 2 to the west and north H:\\COTT\\N14119528\\1_Corres\\C_ToOthers\\119528PlanReview2019-09-13.docx Ravine Meadows Plan Review Page: 2 c.The swale between lots 5 & 6 block 2 d.The drainage path along Military Road downstream of FES-300 10.More detail will be required on future submittals, such as: a.Spot elevations on lot corners b.Emergency overflows clearly labeled c.Intersection details to clarify drainage patterns and grades 11.Identify park/open space marker installations on the plans. The City’s parks department will provide locations. 12.Notes and a typical section should be provided detailing the material and depth of the filtration basin media, liner, and proposed restoration. In addition, we assume the “Rain Garden” detail on sheet L7.1 is intended for the filtration basin. Please coordinate terminology between plan sheets and make the additional revisions per comment 42. 13.Note #19 on the plans should specify six inches of topsoil. Sheet C4.1: 14.Final plans will require plan and profiles of utilities to understand utility cover across the length of pipe, crossing locations, and clearances between crossings. 15.12” DIP watermain from Ravine Parkway should be extended through the site. a.Provide a 12” butterfly valve in the middle of Jeffery Avenue to provide additional isolation. b.Extend the watermain beyond the storm sewer crossing near Military Road and preferably north of the Military Road pavement within the right-of-way (evaluate if construction limits will allow). c.Design and note the restrained length of the dead-end 12” main. d.Provide a blow-off per city detail WAT-8 at the end of the 12” main. 16.Numerous notes overlap in plan view and are not readable: a.Storm and sanitary notes overlap at the MH-2 note. b.Numerous watermain notes along block 2. 17.Please show service information on each lot (wye station, curb box elevation, sewer elevation at upstream end of service, top of riser elevation if applicable). 18.CBMH-102 shall be a sump structure per city detail STO-6. 19.Since the lots along block 1 are to be extended to the eastern plat line, underground storm sewer should be provided to the pond from FES-200. a.Since the last structure in the street prior to a pond should contain a sump, CBMH-201 would also require a sump. 20.Public works does not wish to have submerged pond outlets. Provide a city-standard skimmer structure per detail STO-16. Ravine Meadows Plan Review Page: 3 21.With the elimination of the trail from the outlot, a pond access/maintenance route should be identified around the perimeter of the pond consistent with City detail STO-15. Grades down to the maintenance bench should not exceed a 1:6 slope. This access route and maintenance bench should be clearly depicted and labeled on the plans. 22.8” RCP pipe is not available, see comment #42a for additional comments. 23.A storm sewer structure schedule shall be provided which identifies structure diameter, casting, applicable City Detail Plate number, and special notes such as sump depth as applicable. 24.The maximum velocity into a wet basin is 6-fps. The grade on the following segments and would exceed the velocity requirement: c.CBMH-601 to FES-600 d.CBMH-102 to MH-101; while 34’ of additional pipe to FES-100 is provided, it is recommended that grade be reduced to manage velocity. 25.Provide 3’ minimum cover over storm pipe in street and 2’ min cover in greenspace. Profiles will clarify if cover requirements are met. 26.Catch basins 202 and 203 appear close to the high point in the road. Evaluate the possibility to shift both further south to capture additional drainage. 27.Since the trail along Military is being removed, the catch basin adjacent to it can be relocated. 28.Evaluate the possibility of picking up drainage along Military Road in the storm sewer on Jeffery Avenue versus the culvert crossing. 29.Subwatershed 4s includes an area of 1.25 acres that is shown to flow off-site onto Ravine Parkway. The City will verify that Ravine Parkway design accounted for treatment of site stormwater. 30.It is preferred that storm pipe be placed within the roadway and locations are minimized behind curb. Please add a manhole such that the pipes between CBMH-205 to CBMH-201 aren’t behind cub. Sheet C7.2: 31.Detail SER-7: identify on sheet C4.1 that only lot 1 block 2 and lot 12 block 1 are to utilize this detail. Sheet C7.4: 32.Add the following details: a.Concrete hydrant pad detail (City Plate WAT-9) b.Hydrant detail (WAT-1) c.Gate vale (WAT-3) d.Butterfly valve (WAT-4) e.Dead end line (WAT-8) f.Streetlight (LGT-2) and concrete base (LGT-7) Ravine Meadows Plan Review Page: 4 Sheet L2.1: 33.Boulevard trees should be located 5’ behind curb. 34.Trees should not be planted over utility pipes (storm sewer) or hinder access routes around the ponds or to drainage structures. Please show pipe locations in plan view to demonstrate clearance. Sheet L7.1: 35.Remove the plantings from the raingarden detail. See comment #42 for further information. Other: 36.A street lighting plan will be required with the final plans. a.Residential lights should be approximately 200-250 feet apart located on lot lines and at street intersections. b.Streetlights should be located along the sidewalk side of the street. c.Feed point cabinet locations and source of power should be identified on the plan. d.Identify wire sizes on the plan. Wire to be placed in conduit (1.5-inch minimum NMC). Stormwater: 37.Rational Storm Sewer Design: a.Storm sewer should be sized to a 5-year rational method design. Submit rational method design calculations for the storm sewer system. Please submit a drainage map for each catchment. Include individual pipe segment velocities with calculations for review. 38.Volume Control a.The City requires a uniform volume control treatment equal to 1” of runoff from the net increase in impervious areas. The Stormwater Management Plan indicates an area of impervious surfaces of 3.30 acres proposed. The site includes existing impervious surfaces of 0.68 acres, therefore, a Net Increase in impervious surfaces of 2.62 acres is proposed. The volume control requirement is 9,504 cubic feet. i.The area summary tables on Sheets C2.1 and C3.1 show existing and proposed pervious and impervious areas different than are listed in the drainage area maps and Stormwater Narrative. Please update the pervious and impervious acreages shown to be consistent between the plans, drainage area maps and stormwater narrative report. 39.Stormwater Modeling: A HydroCAD model was prepared of existing and proposed conditions. a.The HydroCAD needs to include an off-site drainage area of approximately 10 to 11 acres that appears to contribute surface runoff from lands south of Military Road onto the Northwest corner of the proposed development. The site topography shows a low area near Block 2 Lots 13 and 14 where runoff from this off-site area may pond. Please include the off-site drainage area in the hydrology and hydraulic calculations. b.Subwatershed 1S includes 2 acres that are simulated to flow into the NURP pond. This area is shown on Sheet C4.1 to be collected in catch basin 103 and routed in a storm Ravine Meadows Plan Review Page: 5 drain to the NURP pond. Since the proposed street has a 2% to 4% slope near this catch basin, it seems plausible that a large part of the runoff may bypass the catch basin and flow off site to Ravine Parkway. Please submit modeling or calculations to demonstrate that the expected runoff to Catch basin 103 can be collected and conveyed to the NURP pond. c.The HydroCAD simulation of Pond P1 should be revised to simulate the NURP pond water surface starting at the normal water level. The HydroCAD model appears to start with an empty pond for each run and indicates no outflow from the NURP pond in a 2- year storm. Please start each simulation with the pond at the normal pool elevation. d.NOAA Atlas 14 Precipitation. The 2-year and 10-year 24-hour precipitation depths used within the HydroCAD model match Atlas 14, but the simulated 100-year 24-hour precipitation depth of 7.2 inches is a bit low. Please revise the existing and proposed models using the Atlas 14 100-year 24-hour precipitation depth of 7.39 inches. e.The HydroCAD models have instability problems—particularly in the 10-year and 100- year simulations of the filtration basin. Please work to improve the model stability. f.Please note that digital copies of the final version stormwater models and shapefiles or CAD drawings of existing and proposed drainage areas are to be submitted to the City once the review and revision process is complete. 40.Rate Control a.The HydroCAD models have several issues to resolve, so please revise and update the rate control analyses when the models are updated. b.Rate Control: Table 1 in the Stormwater Narrative summarizes the existing and proposed conditions peak flows in the 2-year, 10-year and 100-year design events. The 100-year proposed conditions peak flow of 19.31 cfs provides a unit discharge rate of 1.96 cfs/acre—this unit discharge exceeds the South Washington Watershed District allowable unit rate of 1.3 cfs/acre for areas draining to the Central Draw Storage Facility. Please revise the proposed stormwater basins to provide the additional rate control needed to comply with the unit discharge rate of 1.3 cfs/acre. 41.Water Quality: The City requires that new development projects include BMPs that at a minimum achieve post-development reductions in total phosphorus (TP) and total suspended solids (TSS) by 50% and 80%, respectively. Watershed rules call for TP loading rate of 0.075 lbs./acre/year or existing loading rates, whichever is less, since the project site drains to Ravine Lake. Please submit water quality model (MIDS, P8, etc.) results to demonstrate compliance with the water quality standards. For your information, if the P8 model is used, the South Washington Watershed District (SWWD) Standards Manual Vol. 1 includes potential adjustments to the P8 model for a hypothetical residential development within the SWWD (see Section 5.3.1.2 and the Appendix A Water Quality Modeling Example). The Standards Manual is available at the link below: https://www.swwdmn.org/pdf/sitereviews/StdsManualFinalDocument.pdf The applicant is encouraged to propose and incorporate similar adjustments as applicable. Ravine Meadows Plan Review Page: 6 42.Filtration Basin: a.Sheet C4.1 and the HydroCAD model indicate a 42-foot length of 8-inch diameter RCP as the pipe connection between the NURP Pond and the filtration basin. For additional capacity and reduced maintenance, please consider the use of a larger pipe for the pond-to-filter connection such as a 15-inch diameter RCP. b.A skimmer structure should be installed at the outlet from the NURP pond to the filtration basin to prevent debris, organics, trash, hydrocarbons, oil & grease from entering the filtration basin. c.Clay Liner: Please show the clay liner for the NURP Pond and Filtration Basin on the plans. d.Please provide details for the filtration basin showing tile materials, sizes, elevations, cleanouts and the thickness and composition of the filtration media. The City recommends providing a minimum 18” filtration media composed of the following: Filter Topsoil Borrow (MnDOT 3877.2.G) consisting of 70% sand (meeting the gradation requirements of 3126) and 30% Grade 2 Compost (MnDOT 3890). Lower compost levels have typically proved difficult when establishing vegetation in basins. 43.NPDES Construction Stormwater Permit: As this project disturbs more than 1 acre, an NPDES Construction Stormwater Permit and SWPPP will be required.