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PUD 5 Chanhassen Stormwater (2) 2005-09-19_Chanhassen west business park 2.pdfMemo Carver County Water Management – Department of Planning & Zoning Government Center – Administration Building 600 East 4th Street Chaska, Minnesota 55318 Phone: (952)361-1820 Fax: (952)361-1828 www.co.carver.mn.us/water Memo To: Pat Minger From: Paul Moline, Carver County Water Management Date: 9/19/2005 Re: Chanhassen West Business park County Water Project WP20050038 cc. Lori Haak, City of Chanhassen Jerry Backman, Schoell-Madson Aaron Mlynek, Carver SWCD Robert Generous, City of Chanhassen Enclosures: SWPPP Comments Carver County Water Management has received plans (dated 8/25/05), SWPPP and hydrologic calculations (dated 8/26/05) for the Chanhassen West Business Park project in the City of Chanhassen. The following comments include review by the County, the SWCD and Wenck Associates: Stormwater Issues: 1. The calculations for existing conditions should be resubmitted and show the effects of ponding in the northeast wetland. The submitted calculations use sheet flow runoff from 35.74 acres to the southwest wetland, which is not representative of the Existing Drainage figure. The increase in runoff may have impacts on downstream and water quality treatment on site. 2. Water Quality calculations need to be submitted for review. 3. Proposed CNs for greenspace should be raised to C type soils to account for the affect of compaction. 4. Downstream capacity of the southwest wetland (Outlot A) should be submitted. 5. The outlet of the northwest wetland (Outlot B) should be submitted. 6. Rainwater Gardens/Infiltration - Additional details are needed including: • Documentation should be submitted for the volume provided for infiltration. Several basins are noted on the plans, but no calculations are provided. • Soils used (sand fill or rock fill, 50% clean sand, 25% loamy topsoil, 25% compost) • Cross-sections • Erosion control blanket and type • Timing of installation (after contributing area is stabilized). • To reduce initial degradation of basins, It is recommended plugs, shrubs and grasses are used in addition to the ‘rainwater garden seed mix’. Erosion and Sediment Control: (please contact Aaron Mlynek at the Carver SWCD at 952.442.5101 for questions or assistance on this section) Erosion Control 1. Stable EOF’s are needed for the proposed pond on site. The EOF should be clearly labeled on the plan and a detail is needed. The EOF can be stabilized with a turf re-enforcement mat or fabric and riprap. 2. Erosion control blanket should be specified in the swale from the FES to the wetland along the west boundary of the site. The blanket specified should adequately protect the area from designed velocity and depth of flow. The blanket and seed in the swale should be installed within 24 hours of culvert installation. All blanket on the plan should be shown as a shaded area. 3. Erosion control blanket is recommended for the pond slopes from around 952 to 942 contours. All blanket on the plan should be shown as a shaded area. ⚫ Page 2 4. Erosion note number 5 should include 2 tons of mulch per acre with seed for stabilization; seed alone is not considered stabilization. 5. All curb cuts need riprap and fabric or sod installed within 24 hours of curb installation. Sediment Control 1. Temporary sediment basins are needed prior to disturbing upslope areas. The areas of temporary sediment basins should be labeled on the plan. A temporary outlet is needed for the pond; details should be provided. A temporary outlet could consist of a perforated riser and rock cone. Temporary basins are needed in the area of the proposed permanent stormwater pond; the SE corner of the site prior to discharging to the culvert under Galpin. 2. The Wimco inlet control detail proposed will work for all curbside inlets. Any and all area inlets or drop inlets in paved areas will need alternate controls / Wimco details. The engineer should check on alternate designs for Wimco-type inlet controls to fit the various type of inlets. 3. Additional inlet controls may be needed for adjacent inlets on Galpin and Street A. 4. Silt fence will be needed around Outlot A along the east side between the pond the wetland. 5. Silt fence needed for Lot 5, Outlot B. 6. Silt fence needed north of berm in Lot 6 as there is a FES taking water north off site. 7. Silt fence needed south of Lot 1. 8. Each building site will need perimeter controls once the streets are paved and rock exits will be needed as each lot is built-out. 9. Type 1 and Type 2 silt fence locations need to be specified on the plan. Type 2 should be installed around all wetland areas and in the SE corner of the site to protect the culvert under Galpin. The SF should be extended along the South side to close the gap in the SF. SWPPP A SWPPP review has been completed; any items not marked with an ‘x’ or ‘n/a’ need attention. If you have any questions, please feel free to contact me. A follow up meeting may be of benefit. ___________________ Paul Moline 952.361.1825 pmoline@co.carver.mn.us 2005-09-22_Galpin Lyman Storm Report Revised 9-22-05.pdfMay 3, 2005 September 22, 2005 Paul Moline Carver County Planning & Zoning 600 East 4th Street Chaska, MN 55318 Re: Stormwater Management Update Chanhassen West Business Park Dear Paul, We have completed revisions to the drainage areas and calculations for Chanhassen West Business Park based on comments from Carver County Soil & Water. The existing site delineation was revised to more accurately model where stormwater runoff ends up, and a new HydroCAD model was generated. Please refer to the attached drainage exhibits and HydroCAD report for reference. I. Existing Site Delineation The existing site has been divided into four drainage areas, three of which drain to on-site wetlands, and a fourth which drains to a culvert leading off-site. Area EX1 drains to the southwest wetland by overland flow, on-site culverts, and swales along the western and southern edges of the property. Areas EX2 and EX4 drain to the northwest and northeast wetlands, respectively. It appears that the northwest wetland will overflow to the east and into the northeast wetland should water levels rise high enough, but more than likely runoff will simply infiltrate into these two wetlands under average rainfall events. Area EX3 drains to a culvert under Galpin Boulevard. II. Proposed Site Delineation The proposed site has been divided into four drainage areas, and keeps drainage patters as close to existing conditions as possible. The most significant change to the proposed site conditions was the elimination of the northeast wetland, along with a few smaller wetlands that were included in area EX1. The largest drainage area is 1S, which encompasses the entirety of the impervious surface and a majority of the developed area on the site, and drains to proposed pond 4P before being discharged to the southwest wetland. Area 2S is of similar size to area EX2, and drains to the northwest wetland. Since the northeast wetland will be removed, and with it the northwest wetlands’ natural overflow area, an equalizer pipe has been installed along the western edge of the property to connect the northwest wetland to the southwest wetland and provide a route for overflow should it become necessary. Area 4S drains directly into the southwest wetland from surrounding green areas on the site, and area 3S continues to drain to the culvert under Galpin Boulevard. III. Rate Control Based on these new delineations, a new rate comparison was performed for the 2, 10, and 100-year storm events, the results of which are included in the table below. Rainfall Event Southwest Wetland Northwest Wetland Galpin Blvd Culvert Existing Proposed Existing Proposed Existing Proposed 2-Year 10.03 10.00 2.33 2.23 0.66 1.20 10-Year 28.64 25.80 7.42 7.09 2.10 2.67 100-Year 60.37 60.22 16.33 15.61 4.62 4.98 Care was taken to match rates as close to existing conditions as possible so as not to deviate significantly from existing flows entering the wetlands, and runoff rates are less than proposed conditions for all storm events for runoff entering the wetlands. This has been accomplished largely with the pond and its outlet control structure (refer to details sheet in the plan set). The northwest wetland did not contribute any runoff to the southwest wetland during any storm event based on our model, which took infiltration into account. The rates are higher than existing conditions for the Galpin Blvd culvert despite a reduction in the contributing area. This is due to the fact that the area draining to the culvert will be landscaped and will have a higher curve number than the existing wooded area, and therefore will contribute more runoff. There is no impervious area contributing runoff to the culvert, so water quality should remain equal to existing conditions. Please refer to the HydroCAD report for a more detailed analysis. If you have any questions or comments regarding this report, please contact me at 952-847-9608. Sincerely, Jared Jones, E.I.T. Schoell & Madson, Inc. 2005-09-22_Raingarden Diagram-Layout1.pdfLayout1 2005-09-22_Raingarden sizing.pdfRaingarden sizing.xls Raingarden # Approximate inflow area (sf) Volume of Runoff (cf) Volume of Storage (cf) 1 6093 155.37 263 2 13746 350.52 357 3 15945 406.60 438 4 15170 386.84 263 5 18517 472.18 280 6 33215 846.98 854 7 27713 706.68 714 8 26793 683.22 489 9 28648 730.52 801 10 42079 1073.01 1162 11 13597 346.72 495 12 17614 449.16 495 Totals 6607.82 6611.00 Median rainfall event: 0.34" Volume of runoff calculated using: V=A*(.34/12)*.9 Raingarden Sizing 2005-09-22_SWCD response letter.pdfJuly 21, 2005 September 22, 2005 Paul Moline Carver County Water Management 600 East 4th Street Chaska, MN 55318 Re: SWCD Comments Chanhassen West Business Park Dear Paul, This letter is in response to the memo dated 9/19/05 from Carver County Water Management in regards to the Chanhassen West Business Park project in Chaska. Changes have been made to the plans based on comments in the memo, and our response is as follows: Stormwater Issues 1. The calculations for existing conditions should be resubmitted and show the effects of ponding in the northeast wetland. The submitted calculations use sheet flow runoff from 35.74 acres to the southwest wetland, which is not representative of the Existing Drainage figure. The increase in runoff may have impacts on downstream and water quality treatment on site. ➢ The drainage figures and HydroCAD model have been revised to more accurately model where runoff from the site ends up. Please refer to the attached, updated storm report. 2. Water Quality calculations need to be submitted for review. ➢ The pond has been designed to NURP standards for water quality, the calculations of which can be found in the revised drainage calculations under the NURP rainfall event. In summary, 3.817 af (166,269 cf) of runoff enters the pond during the 2.5” rainfall, and the pond has 176,459 cf of dead pool storage available. Calculations on the sizing of raingardens to accommodate runoff from the median rainfall event in the Twin Cities area have also been submitted. Please refer to the attached exhibit. 3. Proposed CNs for greenspace should be raised to C type soils to account for the affect of compaction. ➢ The drainage calculations have been revised to reflect this change. 4. Downstream capacity of the southwest wetland (Outlot A) should be submitted. ➢ The survey provided to us does not contain enough information to determine the capacity of this wetland. In addition to a lack of topographical information from the interior of the wetland, the western boundary of the wetland is not located on the property. 5. The outlet of the northwest wetland (Outlot B) should be submitted. ➢ Information on the inlet from the northwest wetland to the storm sewer pipe along the western boundary has been added to the plans. 6. Rainwater Gardens/Infiltration - Additional details are needed including: ➢ Documentation should be submitted for the volume provided for infiltration. Several basins are noted on the plans, but no calculations are provided • Calculations on the sizing of raingardens to accommodate runoff from the median rainfall event in the Twin Cities are included in an attached exhibit and spreadsheet. In general, the raingardens are sized using the assumption that roof drains will not be used, and that roof runoff will flow across the parking lot. Raingardens are proposed in as many locations as possible, but site conditions and landscape requirements restricted the size and number of raingardens, and as such, they are only proposed where practical. In some cases, the raingardens do not provide enough storage for runoff from the median rainfall event, but it was our opinion that some treatment is better than none at all. ➢ Soils used (sand fill or rock fill, 50% clean sand, 25% loamy topsoil, 25% compost) • A note has been added to the Landscape plan which specifies that this type of soil should be used for rain garden construction. ➢ Cross-sections • A typical rain garden cross-section has been provided on the details sheet. ➢ Erosion control blanket and type ➢ Timing of installation (after contributing area is stabilized). ➢ To reduce initial degradation of basins, It is recommended plugs, shrubs and grasses are used in addition to the ‘rainwater garden seed mix’. • A note has been added to the Landscape plan which details these items. Erosion Control: 1. Stable EOF’s are needed for the proposed pond on site. The EOF should be clearly labeled on the plan and a detail is needed. The EOF can be stabilized with a turf reenforcement mat or fabric and riprap. ➢ A EOF has been added to the plans, and a detail has been added to the grading plan. It shall be stabilized with a turf reinforcement mat. 2. Erosion control blanket should be specified in the swale from the FES to the wetland along the west boundary of the site. The blanket specified should adequately protect the area from designed velocity and depth of flow. The blanket and seed in the swale should be installed within 24 hours of culvert installation. All blankets on the plan should be shown as a shaded area. ➢ The swale on the west side of the property has been removed and replaced with storm sewer, so an erosion control blanket will no longer be necessary in that area. 3. Erosion control blanket is recommended for the pond slopes from around 952 to 942 contours. All blanket on the plan should be shown as a shaded area. ➢ An erosion control blanket has been added to pond slopes and designated by a hatch pattern at all locations on the site. 4. Erosion note number 5 should include 2 tons of mulch per acre with seed for stabilization; seed alone is not considered stabilization. ➢ Note #10 on the SWPPP has been changed to reflect the addition of 2 tons of mulch per acre in addition to seeding for final stabilization. 5. All curb cuts need riprap and fabric or sod installed within 24 hours of curb installation. ➢ All curb cuts will have 10 CY of Class IV riprap added, and a note has been added to the grading plan and SWPPP. Erosion Control: 1. Temporary sediment basins are needed prior to disturbing upslope areas. The areas of temporary sediment basins should be labeled on the plan. A temporary outlet is needed for the pond; details should be provided. A temporary outlet could consist of a perforated riser and rock cone. Temporary basins are needed in the area of the proposed permanent stormwater pond; the SE corner of the site prior to discharging to the culvert under Galpin. ➢ Temporary sedimentation basins have been added to the plan in the locations requested, and are clearly labeled. The primary basin (the stormwater pond) will have a temporary outlet, and a detail has been provided on the details sheet. 2. The Wimco inlet control detail proposed will work for all curbside inlets. Any and all area inlets or drop inlets in paved areas will need alternate controls / Wimco details. The engineer should check on alternate designs for Wimco-type inlet controls to fit the various type of inlets. ➢ A Wimco insert detail for circular manholes and catch basins has been added to the details sheet. 3. Additional inlet controls may be needed for adjacent inlets on Galpin and Street A. ➢ A note has been added to the grading plan instructing the contractor to install Wimco-type catch basin inserts on all proposed catch basins on Galpin Court (formerly Street A) and on Galpin Blvd. 4. Silt fence will be needed around Outlot A along the east side between the pond the wetland. 5. Silt fence needed for Lot 5, Outlot B. 6. Silt fence needed north of berm in Lot 6 as there is a FES taking water north off site. 7. Silt fence needed south of Lot 1. ➢ Silt fence has been added in these locations 8. Each building site will need perimeter controls once the streets are paved and rock exits will be needed as each lot is built-out. ➢ A note has been added to the grading plan detailing this requirement, and since each building will be developed and approved separately, it is likely that this requirement will be met at the time the buildings are built-out. 9. Type 1 and Type 2 silt fence locations need to be specified on the plan. Type 2 should be installed around all wetland areas and in the SE corner of the site to protect the culvert under Galpin. The SF should be extended along the South side to close the gap in the SF. ➢ The two types of silt fence have been added to the plans in the areas requested. SWPPP Review: - Does the SWPPP Narrative: Identify the entity responsible for long term O&M? o The Owners Association has been specified on the SWPPP - Do plan sheets identify: Locations and types of sediment basins? o Sediment basin locations have been specified on the plans - Are Temporary Sedimentation basins: o Adequately sized? ▪ The major sedimentation basin on the site, the stormwater pond, is adequately sized to handle runoff from the entire site. The other sedimentation basins are small and will only treat a limited amount of water, but are oversized for the amount of area that wil lbe draining to them. o Designed to prevent short-circuiting? ▪ The sedimentation basin locations should prevent short-circuiting o Are outlets designed to remove floating debris? o Are outlets designed to allow complete drawdown? ▪ The temporary outlet is detailed on the details sheet, and will be able to remove floating debris and allow complete drawdown if installed. o Do outlets have energy dissipation? o Have a stabilized emergency spillway? ▪ The SWPPP instructs the contractor to provide energy dissipation and a stabilized emergency spillway. - Does the wet sedimentation basin have a stabilized emergency overflow? o The pond has a emergency overflow stabilized with a turn reinforcement mat, and is detailed on the grading plan. - Are wetted perimeters of ditches stabilized within 200 feet of surface water? o A note has been added to the SWPPP. There are no swales on the site as of the most current plan revision - Are sediment control practices established on down gradient perimeters? o Silt fence has been added to close any gaps on down gradients - Do stockpiles have sediment control and placed in areas away from surface waters? o A note has been added to the SWPPP instructing sediment control around any stockpiles the contractor may use. If you have any questions or wish to discuss any of these responses, please feel free to contact me at 952-847-9608. Sincerely, Jared Jones, E.I.T. Schoell & Madson, Inc. CC: Pat Minger, Minger Construction Aaron Mlynek, Carver SWCD Bob Generous, City of Chanhassen Lori Haak, City of Chanhassen 2005-09-27_City comment respons letter 9-16-05.pdfThe Preliminary Plat September 27, 2005 Robert Generous Senior Planner, City of Chanhassen 7700 Market Boulevard PO Box 147 Chanhassen, MN 55317 Re: Chanhassen West Business Park Planning Case #-05-23 Comments dated 9-6-05 Dear Bob, This letter is in response to comments received from the City of Chanhassen dated 9-6-08 regarding final plat approval for Chanhassen West Business Park. The plans have been updated to reflect comments from the city, as well as from Carver County Planning and Zoning. Please find our responses to the city comments below. 1. Landscape plantings have been changed to meet minimum requirements, and a revised Landscape plan has been included in the plan set. 2. A note and detail have been added to the Tree Preservation Plan describing tree protection fencing installation. 3. A note has been added to the Tree Preservation Plan describing what to do in case of damage or removal of trees that have been designated to be preserved. 4. A Minnesota Local/State/Federal Application Form for Water/Wetland projects has been submitted. 5. A wetland buffer is included on the plans around all wetlands. All structures are outside of a 40’ setback, which is shown on the Site Plan. 6. The developer will address this issue 7. The site drainage has been looked at in-depth, and a revised stormwater management plan is attached to this letter. 8. The pond’s emergency overflow has been labeled, a detail provided, and a turf reenforcement mat has been added for stabilization. 9. Temporary stabilization has been addressed on the SWPPP 10. Discharge point stabilization has been addressed on the SWPPP 11. Slope stabilization has been addressed on the SWPPP 12. The swale on the west side of the property has been removed and replaced with storm sewer, so an erosion control blanket will no longer be necessary in that area. Installation time frame for other erosion control blankets is described in the SWPPP, and the blankets have been identified with a hatch on the grading plan. 13. Temporary sedimentation basins have been identified on the plan in the areas requested. A temporary outlet has been called out on the grading plan, and a detail has been added to the details sheet. 14. A general note has been added to the grading plan instructing the contractor to install Wimco-type inlet protection on all catch basins on site and on neighboring Galpin Blvd. The city standard detail for Wimco-type inlet protection is on the details sheet as well as a detail for a Wimco-type inlet control that is not in a curb line. 15. Refer to #14 16. Type 2 silt fence has been installed along Outlot A as requested. 17. The two different types of silt fence have been designated with different linetypes, and are called out on the plans as specified. 18. Street sweeping is described on the SWPPP 19. The developer will address this issue 20. The specified permits have been applied for. 21. The developer will address this issue 22. The developer will address this issue 23. The developer will address this issue 24. A water service has been added to Lot 6 25. Proposed hydrants are clear of any landscaping or lighting features within a 10’ radius. Small utility box locations will have to be coordinated with the respective companies. 26. A note regarding fire protection during construction has been added to the Site Plan. 27. The proposed street name is Galpin Court, and has been included on the plans. 28. A note has been added to the Tree Preservation Plan describing tree waste disposal 29. The developer will address this issue. 30. The developer will address this issue during construction. 31. The storm sewer has been designed for the 10-year, 24-hour storm event, and the calculations are included for city review. Drainage & utility easements have a minimum width of 20 feet, and are included over all public storm sewer. 32. Private easements will be dedicated at the time each individual lot is platted. 33. Private easements will be dedicated at the time each individual lot is platted. 34. The developer will address this issue 35. On the site plan a. The cul-de-sac radius has been changed to 48 feet b. The parking driveway aisles have been changed to 26 feet wide c. The public street has been changed to 36 feet wide d. The access width to Galpin Blvd has been widened to 3 lanes and 44 feet e. The access locations to lots 1 and 8 have been shifted to the west and are aligned to be across from each other f. A 6-foot wide sidewalk ahs been added along the public street g. The Galpin Blvd access radii have been labeled h. The access to Lot 5 has been aligned perpendicular to the shared driveway i. Street lights have been shown j. Handicap parking spaces and ramps have been added 36. On the grading plan a. The silt fence has been modified as requested b. The contour lines have been revised as requested c. The contour lines have been revised as requested d. Retaining wall tops and bottoms have been added e. Emergency Overflows have been shown, and all are at least 1.5’ lower than proposed adjacent lowest floors f. The parking lot slope on Lot 6 has been revised to exceed the minimum g. A removal note has been added as requested h. A rock construction entrance has been shown i. No retaining walls are proposed within the public right-of-way or public utility easements j. A 20-foot easement has been added to the storm sewer between lots 2 & 3 k. Contour lines appear for the berm on Outlot B 37. On the utility plan a. All existing and proposed easements are shown, to the best of our knowledge b. Stub inverts for the proposed sanitary and storm stubs have been added c. A storm sewer schedule has been added to the Public Storm Sewer plan d. Public storm sewer pipe has been changed to RCP e. A sump has been added to CBMH 2A f. The watermain has been revised to C900 PVC when the pipe diameter is proposed to be less than 12”. (The comment requested we revise the sanitary sewer from DIP to C900: we assume this was a typographical error, and watermain was meant to be noted) g. Pipe crossings have been added to the utility profiles h. Minimum vertical separation is 18” for all pipe crossings i. Watermain fittings have been called out 38. A note has been added to the grading plan. The developer will address this issue. 39. The specified details have been added to one of the two details sheets 40. A professional engineer will sign the plans prior to final approval 41. The pond has been designed to NURP standards 42. Cross-access easements for the shared entrance drives will be obtained as each individual lot is platted. 43. The developer will address this issue 44. The latest city details and specifications have been specified in the plans and project manual. Detailed plans will be provided prior to final platting and construction of utilities, and it is understood that pre con meetings will need to take place. Permits will be obtained by Schoell & Madson, Inc. 45. The developer will address this issue 46. Private streets will be constructed to city standards. The developer will submit an inspection/soil report after construction has been completed. 47. Six foot wide sidewalks have been added to the plans 48. All of the rear yards of the proposed buildings are at least 3 feet higher than the HWL of the pond 49. The developer will address this issue 50. The memo has been received, and comments from Carver County have been addressed in the plan revisions 51. Plans for the proposed city utilities and street have been reduced to 22”x34” size. 52. A conservation easement shall be dedicated over Outlot C 53. We look forward to working with city staff to resolve any drainage issues that may arise 54. A berm has been added to Lot 5 outside the wetland buffer The Wetland alteration permit was subcontracted out to Kjolhaug Environmental Services Company, and they have been working with the City to address any concerns. Please contact Mark Kjolhaug or Mike Deryuter at 952-401-8757 with any remaining issues that have yet to be addressed. If you have any further questions or comments regarding these responses, please contact Jerry Backman or myself. We look forward to working with the City through final approval. Sincerely, Jared Jones, E.I.T. Schoell & Madson, Inc. CC: Pat Minger, Minger Construction Paul Moline, Carver Planning & Zoning 2005-09-29_Drainage Areas SWCD - Existing-Existing To Scale.pdfExisting To Scale 2005-09-29_Drainage Areas SWCD - Proposed-Proposed To Scale.pdfProposed To Scale 2005-10-21_Carver Response Letter 10-20.pdfJuly 21, 2005 October 21, 2005 Paul Moline Carver County Water Management 600 East 4th Street Chaska, MN 55318 Re: County Comments, 10-14-05 Chanhassen West Business Park Dear Paul, This letter is in response to the memo dated 10/14/05 from Carver County Water Management in regards to the Chanhassen West Business Park project. Changes have been made to the plans based on comments in the memo, and our response is as follows. A general note on the plan set – the SWPPP has been separated from the rest of the plans, and now contains three sheets: narrative, erosion control plan (a carbon copy of the grading plan), & erosion control details. Stormwater Issues 1. Downstream capacity of the southwest wetland (Outlot A) is needed. ➢ The southwest wetland was originally a pond designed and built by the City of Chaska, and has since grown and taken on wetland characteristics. City engineer Bill Monk was able to find the original design data for the pond, and supplied us with the following information: • Pond name: EC-P41 • 50 acre direct tributary • 4.8 acre area • 14.0 ac-ft of storage • NWL = 935.0 • HWL = 940.0 • Outflow = 15 cfs Without additional topography, this is the best information we will be able to provide. We looked into obtaining aerial topography, but it was either too old or not accurate enough for our purposes. Given the large amount of storage currently available and the fact that we are expanding the wetland in addition to reducing runoff rates, we feel that the capacity should be sufficient. 2. Rainwater Gardens/Infiltration - Details need to be amended to address: • Remove the sock from the draintile in the rainwater garden typical detail. The sock is not needed as the trench itself is wrapped with geotextile. • The draintile in the typical detail is shown as extending only about 1/3 the distance of the bottom of the rainwater garden. The draintile should extend the entire distance of the bottom of the rainwater garden. - The typical detail has been changed to reflect these comments • Elevations of the trench bottom, layers of rock, and sand / compost / organic mix, invert of the draintile in relation to the outlet invert elevation and NWL / HWL of each system and stormwater basins is needed. - The rims of the raingarden outlets and the elevations of the bottoms of the raingardens have been called out on the grading plan. The thickness of the rock layers and soil mixes are the same on every raingarden, and since the typical detail specifies a depth below the trench bottom, the elevations of these layers should be easy to calculate during construction. The raingardens will have no normal water level, as they should be dry most of the time, and the high water levels will be the same as the rim elevation of the outlet. The draintile lengths, slopes, and invert elevations at the outlet structures have been called out on the utility plan. • Detail of filtration shelf needs to be specific to the site application. The detail used is a general template from Carver County meant to be a guide and not for construction. - A filtration shelf cross-section has been added to the details sheet, and the template from Carver County removed from the plans. The draintile in the shelf and its connection to the outlet structure are shown on the storm sewer plans. Erosion Control: 1. It is unclear when the temporary sediment outlets will be used and when the permanent outlets will be used. In the plan it states that IF the permanent outlet is not installed a temporary outlet will be needed. Once the permanent outlet is installed, the pond can no longer be used as a temporary sediment basin. The temporary perforated outlets must be installed with the excavation of the temporary basins. The basins must be excavated prior to exposing upslope areas which shed water to the basin locations. Plans sheets should be amended to reflect this. ➢ The note on the grading plan has been revised to reflect the fact that the pond can no longer be used as a temporary basin once the permanent outlet has been installed. The SWPPP has also been modified to address the temporary outlets and when they should be installed. A detail of the temporary basin construction has also been added to the details sheets. Thank you for continuing to work with us on this project; we appreciate your time and effort, and look forward to the resolution of comments on this project. Please contact me at 952-847-9608 or jaredj@schoellmadson.com if you have any other questions or comments. Sincerely, Jared Jones, E.I.T. Schoell & Madson, Inc. CC: Aaron Mlynek, Carver SWCD Kent Torve, Wenck Associates 2007-08-06_Chan West Pond As-built.pdf Plans/2005-10-21_5-Site 11-30-05.PDF Plans/2005-9-16_Preliminary Plans 9-16-05 11x17.pdf a: w 0ce < C oa 0 C. UJ W C Z U) < C < C Z .. J U) < C C a: Z W c ~< C Z .. w Z r:0 Zwa: (/ J < C 0. Q(/)I0 I- a:: < C>~ it) LL ::) 0 0UJ a: a:-"" c1- 1 UJ m w a:0 - it) z z 0 .. I- :: t 0 C Z LLW 1-WZC. J 0- t- : E cO W< CZIa: UJ<cO J Z ~< C I- .... J W' W UJ..JI--' a: W en < CD: .. 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