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Home My WebLink About2016-07-18 MSCWMO Approval with Conditions Julie Hultman From: Eric Johnson Sent: Monday, July 18, 2016 3:38 PM To: Julie Hultman Subject: FW: Boutwells Chapel Review Results Attachments: 8outwe||s [hapeiRevew[heck|ig_7_2016.pdt Boutwe||s_[hape|_P/oject_Review_conditinna|_7_2016.pdf FOR THE FILE - — From: Mike Isensee [nnai|to:M\sensee@mnwcd.orQ] Sent: Monday,July 18, I016 2:07 PM To: Eric Johnson <eaiohnson@cityofoakparkheighto.com> Cc: mvvoodruff@>|ar»onengr.cono; trose@|araonengrcom Subject: Boutwells Chapel Review Results Hello Eric, The Middle St. Croix WMO has completed a review of the proposed Boutwells Chapel project, located at 5450 Nolan Parkway N, in Oak Park Heights, MN. The attached review results recommend approval with four conditions. Please contact me if you have any questions. Thank you, Mike Mikael |senaeo, CPESC I Administrator Middle St. Croix Watershed Management Organization Watershed Specialist|VVaahingmn Conservation District 1455 Hayward Ave. | Oakdale, MN 55128 '2851-33O-0220 Ext. 22 | Fax 651-330-7747 Cell Phone: 612'839'6492miaonoeomnwod.o,q m^ww.msvwmoo,qvmpw.mn*odorg 1 MIDDLE ST. CROIX WATERSHED MANAGEMENT ORGANIZATION 455 HAYWARD AVENUE OAKDALE , MINNESTOA 55128 ■ _..tr Phone128 • t Phone x22 fax 6 5 1 . 3 3 0 . 7 7 4 7 www . mscwmo . org MSCW July 18,2016lzeml Eric Johnson,Administrator " �" .. City of Oak Park Heights 14168 Oak Park Blvd.N. Oak Park Heights,MN 55082 ',""v� RE: Boutwells Chapel Dear Mr. Johnson, The Middle St. Croix Watershed Management Organization (MSCWMO) received required submittal items on June 21, 2016 and revised documents on July 17, 2016 for the proposed Boutwells Chapel, located within MSCWMO boundaries and in the City of Oak Park Heights. The proposed project qualifies for full review under the MSCWMO 2015 Watershed Management Plan(WMP). The project,as submitted,meets the Policies and Performance Standards contained within Section 7.0 of the 2015 MSCWMO WMP. The MSCWMO recommends approval of the project,with the following conditions: • Include tabulated quantities of all erosion prevention and sediment control BMPs. • To meet the Minnesota Stormwater Manual Media soil Phosphorous index please change the Bio-Filtration cross section note on sheet C5.1 to read: Mixed soil blend composed of 70% sand/30%peat or co pest. Plaisteds 70/30 Dai.. Garden Mix Accublended media or Approved Equal. • Submit a maintenance agreement approved by the City. • Provide the dedications or easements for the stormwater management facility areas below the 100 year flood level. The enclosed checklists contain detailed information on project review qualification and the policies and performance standards of the WMP. MSCWMO review process information can be downloaded from www.mscwmo.org. Feel free to contact me at 651-330-8220 x22 or misensee@mnwcd.org if you have any questions regarding these comments. Sincerely, Mikael Isensee Administrator Middle St. Croix Watershed Management Organization Cc: Chuck Dougherty,MSCWMO Board Manager Matt Woodruff,P.E.,Larson Engineering Inc. 3524 Labore Rd.White Bear Lake,MN 55110 Enclosures Middle St. Croix Watershed Management Organization Member Communities Afton, Bayport, Baytown, Lakeland, Lakeland Shores, Lake St. Croix Beach, Oak Park Heights, St. Mary's Point, Stillwater, a West Lakeland MIDDLE ST. CROIX WATERSHED MANAGEMENT ORGANIZATION 455 HAYWARD AVE . N . iY. , „ O A K D A L E , MINNESTOA 5 5 1 2 8 Phone 651 . 330 . 8220 x22 fax 651 . 330 . 7747 www . mscwmo . org PROJECT REVIEW MSCWh laiqelona MSCWMO Project Review ID: 16-013 Project Name: Boutwells Chapel Applicant: Matt Woodruff, Larson Engineering Inc., 3524 Labore Rd., White Bearl Lake, MN 55082 Purpose: New chapel will associated parking lot and sidewalk expansions. Location: 5450 Nolan Pkwy, N., Oak Park Heights Review date: 7/18/2016 Recommendation: Approve with conditions: • Tabulated quantities of all erosion prevention and sediment control BMPs. • To meet the Minnesota Stormwater Manual Media soil Phosphorous index please change the Bio-Filtration cross section note on sheet C5.1 to read: Mixed soil blend composed of 70%sand/30% peat er-cst. Plaisteds Accublended media or Approved Equal. • Provide a maintenance agreement,which may be in the format of Appendix K,or other form approved by the city. • Identify the location and type of final stabilization methods(including seed mixtures for in the basin)for all exposed areas. Provide the dedications or easements for the stormwater management facility areas below the 100 year flood level. Applicability: ❑ Any project undertaking grading,filling, or other land alteration activities that involve movement of 100 cubic yards of earth or removal of vegetation on greater than 10,000 square feet of land ® Any project that creates or fully reconstructs 6,000 square feet or more of impervious surface ❑ All major subdivisions or minor subdivisions that are part of a common plan of development. Major subdivisions are defined as subdivisions with 4 or more lots. ❑ Any project with wetland impacts ❑ Any project with grading within public waters ❑ Any project with grading within buffers ❑ Any project with grading within 40-feet of the bluff line ❑ Development projects that impact 2 or more of the member communities Middle St. Croix Watershed Management Organization Member Communities Afton, Bayport, Baytown, Lakeland, Lakeland Shores, Lake St. Croix Beach, Oak Park Heights, St. Mary's Point, Stillwater, &West Lakeland July 18,2016 Page 2 of 9 ❑ New or redevelopment projects within the St. Croix Riverway that require a building permit that adds five hundred (500)square feet or more of additional impervious surface n Any project requiring a variance from the current local impervious surface zoning requirements for the property ❑ Any land development activity, regardless of size,that the City determines is likely to cause an adverse impact to an environmentally sensitive area or other property, or may violate any other erosion and sediment control standard set by the member community. SUBMITTAL ITEMS: Electronic submittals are highly encouraged ▪ A completed and signed project review application form and review fee ® Grading Plan/Mapping Exhibits a. Property lines and delineation of lands under ownership of the applicant. b. Delineation of existing on-site wetlands,shoreland and/or floodplain areas (including any buffers). c. Ordinary High Water(OHW)elevations and datum,as determined by the MDNR (if applicable). d. Existing and proposed site contour elevations related to NAVD 1988 datum (preferred)or NGVD, 1929. Datum must be noted on exhibits. e. Drainage easements covering land adjacent to ponding areas,wetlands, and waterways up to their 100-year flood levels and covering all ditches and storm sewers.Access easements to these drainage easements and to other stormwater management facilities shall also be shown. f. Minimum building elevation for each lot. g. Identification of downstream water body. ® Permanent Stormwater Management System in compliance with the requirements of the NPDES SDS Construction Stormwater Permit and MSCWMO Performance Standards. a. Impervious areas(Pre-and Post-Construction). b. Construction plans and specifications for all proposed stormwater management facilities. c. Location(s)of past, current or future onsite well and septic systems(if applicable). Other exhibits required to show conformance to these Performance Standards ❑ A Stormwater Pollution Prevention Plan in compliance with the requirements of the NPDES SDS Construction Stormwater Permit ® Grading Plan/Mapping Exhibits: a. Delineation of the subwatersheds contributing runoff from off-site, proposed and existing on-site subwatersheds, and flow directions/patterns. Middle St. Croix Watershed Management Organization MEMBER COMMUNITIES: Afton,Bayport,Baytown Township,Lakeland,Lakeland Shores,Lake St.Croix Beach,Oak Park Heights,St.Mary's Point,Stillwater and West Lakeland Township July 18,2016 Page 3 of 9 b. Location,alignment,and elevation of proposed and existing stormwater facilities. c. Existing and proposed normal water elevations and the critical (the highest)water level produced from the 100-year 24-hour storms. d. Location of the 100-year flood elevation, natural overflow elevation, and lowest floor elevations. ® Hydrologic/Hydraulic Design Exhibits: a. All hydrologic and hydraulic computations completed to design the proposed stormwater management facilities shall be submitted. Model summaries must be submitted.The summaries shall include a map that corresponds to the drainage areas in the model and all other information used to develop the model. b.A table (or tables) must be submitted showing the following: i.A listing of all points where runoff leaves the site and the existing and proposed stormwater runoff rates and volumes. ii. A listing of the normal water levels under existing and proposed conditions and the water levels produced from the storm and runoff events listed above for all on-site wetlands, ponds,depressions, lakes,streams, and creeks. ▪ Dedications or easements for the portions of the property which are adjacent to the facility and which lie below the 100 year flood level. For sites within public right-of-way, no easement is required. ▪ A proposed maintenance agreement,which may be in the format of Appendix K, or other form approved by the city or township. HISTORY&CONSIDERATIONS: SPECIAL OR IMPAIRED WATER NA This site drains to,and is within one mile of special or impaired water and complies with enhanced protections. a. Scenic or Recreational river C.1.,C.2., C.3. b. Scientific and Natural area C.1.,C.2., C.3. c. Waterbody with a TMDL C.1., C.2. C.1. Stabilization initiated immediately and all soils protected in seven days/provide temp basin for five acres draining to common location. C.2.Treat water quality volume of one inch of runoff by retaining on site unless not feasible due to site conditions(See Part III.D.1. design requirements). C.3. Maintain buffer zone of 100 linear feet from Special Water. EROSION AND SEDIMENT CONTROL[A checked box indicates compliance] Middle St. Croix Watershed Management Organization MEMBER COMMUNITIES: Afton,Bayport,Baytown Township,Lakeland,Lakeland Shores,Lake St.Croix Beach,Oak Park Heights,St.Mary's Point,Stillwater and West Lakeland Township July 18,2016 Page 4 of 9 ® A Storm water Pollution Prevention Plan(SWPPP)that meets the National Pollutant Discharge Elimination System (NPDES)requirements. Narrative ® Identify the person knowledgeable and experienced who will oversee the implementation of the SWPPP;the installation, inspection,and maintenance of the BMPs. a. Identifies the person who will oversee the BMP inspection and maintenance. b. Identify the training requirements are satisfied. c. Inspections performed once every 7 days. d. Inspections performed within 24 hours of a rain event greater than 0.5 in/24 hours. e. Inspection and Maintenance records include: i. Date and time of inspection. ii. Name of person(s) conducting inspections. iii. Finding of inspections, including the specific location where corrective actions are needed. iv. Corrective actions taken (including dates,times, and party completing maintenance activities). v. Date and amount of rainfall events greater than 0.5 in/24 hours. vi. Rainfall amounts must be obtained by a properly maintained rain gauge installed onsite, or by a weather station that is within one mile or by a weather reporting system. vii. Requirements to observe,describe, and photograph any discharge that may be occurring during the inspection. viii. All discovered nonfunctional BMPs must be repaired, replaced,or supplemented with functional BMPs within 24 hours after discovery,or as soon as field conditions allow. ® Describes procedures to amend the SWPPP and establish additional temporary ESC BMPs as necessary for site conditions. ® Describes the installation timing for all Erosion Sediment Control (ESC) Best Management Practices (BMPs). ® Describes final stabilization methods for all exposed areas. ® Methods used to minimize soil compaction and preserve topsoil must be described. ® Describes dewatering technique to prevent nuisance conditions,erosion,or inundation of wetlands? ® Identifies any specific chemicals and the chemical treatment systems that may be used for enhancing the sedimentation process on the site,and how compliance will be achieved with the permit requirements. ® Describes pollution prevention management measures a.Storage, handling,and disposal of construction products, materials,and wastes. b. Fueling and maintenance of equipment or vehicles;spill prevention and response. c.Vehicle and equipment washing. Middle St. Croix Watershed Management Organization MEMBER COMMUNITIES: Afton,Bayport,Baytown Township,Lakeland,Lakeland Shores,Lake St.Croix Beach,Oak Park Heights,St.Mary's Point,Stillwater and West Lakeland Township July 18,2016 Page 5 of 9 d. No engine degreasing allowed on site. e.Containment of Concrete and other washout waste. f. Portable toilets are positioned so that they are secure. Plan sheets NA Temporary Sediment Basins required(10 acres draining to common location or 5 acres App.A) Basin design meets the following criteria: a. Adequately sized—2-year, 24-hour storm, minimum 1,800 feet/acre;or no calculative minimum 3,600ft3/acre. b. Designed to prevent short circuiting. c. Outlets designed to remove floating debris. d. Outlets designed to allow complete drawdown. e. Outlets designed to withdraw water from the surface f. Outlets have energy dissipation. g. Have a stabilized emergency spillway. h. Situated outside of surface waters and any natural buffers. ® Locations and types of all temporary and permanent Erosion Control BMPs. a. Exposed soils have erosion protection/cover initiated immediately and finished within 14 days (or 7 days Appendix A). b.Wetted perimeters of ditches stabilized within 200 feet of surface water within 24 hours. c. Pipe outlets have energy dissipation within 24 hours of connecting. ® Locations and types of all temporary and permanent Sediment Control BMPs. a. Sediment control practices established on down gradient perimeters and upgradient of any buffer zones. b. All inlets are protected. c. Stockpiles have sediment control and placed in areas away from surface waters or natural buffers. d. Construction site entrances minimize street tracking? e. Plans minimize soil compaction and, unless infeasible to preserve topsoil. f. 50 foot natural buffers preserved or(if not feasible) provide redundant sediment controls when a surface water is located within 50 feet of the project's earth disturbances and drains to the surface water. II Tabulated quantities of all erosion prevention and sediment control BMPs. ® Stormwater flow directions and surface water divides for all pre-and post-construction drainage areas. Middle St. Croix Watershed Management Or2aniization MEMBER COMMUNITIES: Afton,Bayport,Baytown Township,Lakeland,Lakeland Shores,Lake St.Croix Beach,Oak Park Heights,St.Mary's Point,Stillwater and West Lakeland Township July 18,2016 Page 6 of 9 NA Locations of areas not to be disturbed (buffer zones). NA Location of areas where construction will be phased to minimize duration of exposed soil areas. NA Blufflines are protected from construction activities in urban (40 foot buffer)areas and rural areas(100 foot buffer). LAKE, STREAM AND WETLAND BUFFERS NA A buffer zone of unmowed natural vegetation is maintained or created upslope of all water bodies(wetlands, streams, lakes). NA A 50 foot natural buffer or(if a buffer is infeasible) provide redundant sediment controls when a surface water is located within 50 feet of the project's earth disturbances and stormwater flows to the surface water. NA If adjacent to a Special or Impaired Water an undisturbed buffer zone of not less than 100 linear feet from the special water is maintained both during construction and as a permanent feature post construction. STORMWATER MANAGEMENT[A checked box indicates compliance] ® Water quality treatment is provided prior to direct discharge of stormwater to wetlands and all other water bodies. Rate and Flood Control Standards ® The peak rate of stormwater runoff from a newly developed or redeveloped site shall not exceed the 2-, 10-,and 100-year 24-hour storms with respective 2.8,4.2, and 7.3-inch rainfall depths with MSCWMO approved time distribution based on Atlas 14 for existing and proposed conditions. The runoff curve number for existing agriculture areas shall be less than or equal to the developed condition curve number.The newly developed or redeveloped peak rate shall not exceed the existing peak rate of runoff for all critical duration events, up to and including the 100-year return frequency storm event for all points where discharges leave a site during all phases of development. ® Predevelopment conditions assume"good hydrologic conditions"for appropriate land covers as identified in TR-55 or an equivalent methodology. Runoff curve numbers have been increased where predevelopment land cover is cropland: Hydrologic Soil Group A: Runoff Curve Number 56 Hydrologic Soil Group B: Runoff Curve Number 70 Hydrologic Soil Group C: Runoff Curve Number 79 Hydrologic Soil Group D: Runoff Curve Number 83 ® Computer modeling analyses includes secondary overflows for events exceeding the storm sewer systems level-of- service up through the critical 100-year event. ® In sub-areas of a landlocked watershed,the proposed project does not increase the predevelopment volume or rate of discharge from the sub-area for the 10-year return period event. Middle St. Croix Watershed Management Organization MEMBER COMMUNITIES: Afton,Bayport,Baytown Township,Lakeland,Lakeland Shores,Lake St.Croix Beach,Oak Park Heights,St.Mary's Point,Stillwater and West Lakeland Township July 18,2016 Page 7 of 9 ▪ Flowage easements up to the 100-yr flood level have been secured for stormwater management facilities(such as ditches and storm sewers). ® Lowest floor elevations of structures built adjacent to stormwater management features and other water bodies are a minimum of two feet above the 100-year flood elevation and a minimum of two feet above the natural overflow of landlocked basins. Volume Control Standards ® Calculations/computer model results indicate stormwater volume is controlled for new development and redevelopment requirements per the MSCWMO Design Standards. 1. New Nonlinear Development 1.1" * new impervious surfaces 2. Reconstruction/Redevelopment Projects 1.1" * reconstructed impervious surfaces 3. Linear Projects 0.55" * new and/or fully reconstructed impervious surface and 1.1"from net increase in impervious area 4. Sites with Restrictions-flexible treatment options documentation has been provided. Volume Retention Required (cu.ft.) Volume Retention Provided (cu.ft.) X sf*0.55 = x cu.ft. BMP Volume x sf*1.1"= x cu.ft. BMP#1 x cu.ft. Total Required x cu.ft. Total Proposed x cu.ft. Flexible Treatment Options(when applicable) NA Applicant demonstrated qualifying restrictions as defined in Section 7.2.2 (4)of the 2015 MSCWMO Watershed Management Plan that prohibits the infiltration of the entire required volume. NA MIDS calculator submission demonstrates retention of 0.55"of runoff from the proposed impervious surfaces and removes 75%of the annual total phosphorous. Infiltration/Filtration Design Standards ❑ Proposed stormwater management features meet or exceed NPDES General Construction Permit requirements are designed in conformance with the most recent edition of the State of Minnesota Stormwater Manual. ® None of the following conditions exist that prohibit infiltration of stormwater on the site a. Areas where vehicle fueling and maintenance occur. b. Areas with less than three (3)feet of separation distance from the bottom of the infiltration system to the elevation of the seasonally saturated soils or the top of bedrock. Middle St. Croix Watershed Management Organization MEMBER COMMUNITIES: Afton,Bayport,Baytown Township,Lakeland,Lakeland Shores,Lake St.Croix Beach,Oak Park Heights,St.Mary's Point,Stillwater and West Lakeland Township July 18,2016 Page 8 of 9 c. Areas where industrial facilities are not authorized to infiltrate industrial stormwater under an National Pollutant Discharge Elimination System (NPDES)/State Disposal System (SDS) Industrial Stormwater Permit issued by the MPCA. d. Areas where contaminants in soil or groundwater will be mobilized by infiltrating stormwater. e. Areas of Hydrologic Soil Group D (clay)soils f. Areas within 1,000 feet up-gradient,or 100 feet down-gradient of active karst features unless allowed by a local unit of government with a current MS4 permit. ® Minimum setbacks from the Minnesota Department of Health for infiltration practices are met Setback Minimum Distance(ft) Property line 10 Building foundation* 10 Private well 35 Public water supply well 50 Septic system tank/leach field 35 *Minimum with slopes directed away from the building ® Pretreatment devices(s) remove at least 50%of sediment loads. If downstream from a potential hot spot, a skimmer is in place to facilitate cleanup. ® Water quality volume will be discharged through infiltration or filtration media in 48 hours or less. a. For bioretention (biofiltration and bioinfiltration)volume control management facilities above ground with vegetation the period of inundation shall be calculated using the maximum water depth below the surface discharge elevation and the soil infiltration rate.The maximum water depth for bioretention stormwater volume is 1.5" b. For infiltration basin volume control management facilities the period of inundation shall be calculated using the maximum water depth below the surface discharge elevation and the soil infiltration rate. The maximum water depth for infiltration basin volume control management facilities above ground with vegetation is 4.0 feet. ®Appropriate soil borings have been conducted that meet the minimum standards. a. A minimum of one boring was conducted at the location of the infiltration facility for facilities up to 1,000 ft2; between 1,000 and 5,000 ft2,two borings, between 5,000 and 10,000 ft2,three borings and greater than 10,000 ft2 4 borings plus an additional boring for every 2,500 ft2 beyond 12,500 ft2 b.Soil borings extend a minimum of five feet below the bottom of the infiltration practice. If fractured bedrock is suspected,the soil boring goes to a depth of at least ten feet below the proposed bottom of the volume control facility. c. A minimum of three feet of separation to the seasonal water table and/or bedrock. d. Identify unified soil classification. Middle St. Croix Watershed Management Organization MEMBER COMMUNITIES: Afton,Bayport,Baytown Township,Lakeland,Lakeland Shores,Lake St.Croix Beach,Oak Park Heights,St.Mary's Point,Stillwater and West Lakeland Township July 18,2016 Page 9 of 9 ®The least permeable soils horizon identified in the soil boring dictated the infiltration rate. NA Additional flows are bypassed and are routed through stabilized discharge points. NA Filtration basin demonstrates a basin draw down between 24 hours and 48 hours. NA Filtration system designed to remove at least 80%of total suspended solids NA Filtration system Iron Enhanced Sand Filter is sized to bind soluble phosphorous removal for 30 year functional life of the system using the published value of 17lbs.phosphorous removal per 20 yards of 5% by weight iron filings to 95% sand. ® Construction plans provide adequate construction guidance to prevent clogging or compaction and demonstrate performance. a. Excavation within 2.0 feet of final grade for infiltration/filtration systems is prohibited until contributing drainage areas are constructed and fully stabilized. b. Rigorous sediment and erosion controls planned to divert runoff away from the system. c. Installation of volume control facilities must occur in dry soil conditions. Excavation,soil placement and rapid stabilization of perimeter slopes must be accomplished prior to the next precipitation event. d. Excavation shall be performed by an excavator with a toothed bucket. Use excavator bucket to place materials. Construction equipment shall not be allowed into the basin. e. Prior to the release of any remaining fee or security,the permit holder must provide documentation that constructed volume control facilities perform as designed. ®There is a way to visually verify the system is operating as designed. Z A minimum 8.0' maintenance access is provided to all stormwater facilities. WETLAND PERFORMANCE STANDARDS NA Direct discharge of stormwater to wetlands and all other water bodies without water quality treatment is prohibited. NA Any potential changes to the hydrology of the wetland (i.e. changes to the outlet elevation or contributing drainage area) must be reviewed to evaluate the impact of both the existing and proposed wetland conditions and approved by the MSCWMO. NA Land-altering activities shall not increase the bounce in water level or duration of inundation from a 2.0-inch 24- hour storm for any downstream wetland beyond the limit specified in Table 7.2 for the individual wetland susceptibility class. RECOMMENDATION: Middle St. Croix Watershed Management Organization MEMBER COMMUNITIES: Afton,Bayport,Baytown Township,Lakeland,Lakeland Shores,Lake St.Croix Beach,Oak Park Heights,St.Mary's Point,Stillwater and West Lakeland Township