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Home My WebLink About07M Surface Water Management Plan – Submittal of Draft for Agency Review Djuz!pg!Dpuubhf!Hspwf 312: TVSGBDF!XBUFS! NBOBHFNFOU! QMBO ! Certification Surface Water Management Plan City of Cottage Grove BMI No. N14.117158 February 2019 I hereby certify that this plan, specification or report was prepared by me or under my direct supervision, and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. By: Brent Johnson, P.E. License No. 20378 Date: I hereby certify that this plan, specification or report was prepared by me or under my direct supervision, and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. By: Dustin deFelice, P.E. License No. 54157 Date: Prepared by: Bolton & Menk, Inc. Certification Page ! Table of Contents Executive Summary ....................................................................................................................................... 4! Section I - Introduction ................................................................................................................................. 5! 1.1!Overview ....................................................................................................................................... 5! 1.2!Purpose ......................................................................................................................................... 5! 1.3!Organization ................................................................................................................................. 5! Section 2 - Land and Water Resources ......................................................................................................... 7! 2.1!Topography and Watersheds ....................................................................................................... 7! 2.2!Landuse ......................................................................................................................................... 7! 2.3!Geology and Groundwater ........................................................................................................... 7! 2.4!Soils ............................................................................................................................................... 8! 2.5!Key Water Resources .................................................................................................................... 9! Section 3 - Goals and Policies...................................................................................................................... 12! 3.1!Purpose ....................................................................................................................................... 12! 3.2!City of Cottage Grove ................................................................................................................. 12! 3.3!Watershed Management Organization Requirements .............................................................. 22! 3.4!State and Federal Agency Requirements ................................................................................... 23! 3.5!Agency Stormwater Publications ................................................................................................ 26! 3.6!Agency Contacts ......................................................................................................................... 26! Section 4 - Wetland Protection and Management ..................................................................................... 27! 4.1!Watershed Management Organizations .................................................................................... 27! 4.2!Wetland Assessment .................................................................................................................. 27! 4.3!Wetland Management Standards .............................................................................................. 27! 4.4!Summary of Wetland Management Standards .......................................................................... 30! 4.5!Procedures for Wetlands not Inventoried .................................................................................. 31! Section 5 - Water Quality Assessment ........................................................................................................ 32! 5.1!Background ................................................................................................................................. 32! 5.2!System Improvements for Water Quality ................................................................................... 32! 5.3!Water Quality Cash Dedication .................................................................................................. 32! 5.4!Total Maximum Daily Loads and Impaired Waters .................................................................... 34! 5.5!NPDES MS4 Permit Program....................................................................................................... 35! 5.6!Recommendations ...................................................................................................................... 36! Section 6 - Water Quantity Assessment ..................................................................................................... 37! 6.1!Technical Background ................................................................................................................. 37! 6.2!Stormwater Modeling Overview ................................................................................................ 41! 6.3!System Analysis and Recommendations .................................................................................... 42! Prepared by: Bolton & Menk, Inc. Table of Contents ! 6.4!High Priority Stormwater QuaNtITy Recommendations ............................................................ 51! Section 7 - Implementation ........................................................................................................................ 53! 7.1!General ....................................................................................................................................... 53! 7.2!Regulatory Administrative Respsonsibilities .............................................................................. 53! 7.3!Education .................................................................................................................................... 54! 7.4!Operation and Maintenance ...................................................................................................... 56! 7.5!Trunk Surface Water System Costs............................................................................................. 60! 7.6!Financing ..................................................................................................................................... 60! 7.7!Amendment Procedures ............................................................................................................. 61! 7.8!Annual Report to Council ............................................................................................................ 61! 7.9!System Improvement Projects and Activities ............................................................................. 61! Section 8 - Summary and Recommendations ............................................................................................. 65! 8.1!Summary ..................................................................................................................................... 65! 8.2!Recommendations ...................................................................................................................... 65! Section 9 - References................................................................................................................................. 66! Section 10 - Glossary of Technical Terms ................................................................................................... 67! Tables Table 2.4 - Soil Drainage Characteristics ....................................................................................................... 8! Table 3.2 - Summary of situations where infiltration of stormwater runoff is prohibited or not recommended. ............................................................................................................................................ 19! Table 3.3.1 - Goals of the SWWD Plan ........................................................................................................ 22! Table 4.3 - Wetland Management Classification ........................................................................................ 28! Table 4.3.2 - Wetland Community Susceptibility to Stormwater Impacts* ............................................... 29! Table 4.4 - Wetland Management Standards for Wetlands within SWWD ................................................ 30! Table 5.4 - 303(d) List of Impaired Waters within the City of Cottage Grove ............................................ 35! Table 6.1.2 - Runoff coefficients and Curve Numbers for Future Land Use ............................................... 38! Table 6.2 - 2030 vs. 2040 Future Land Use Curve Number Comparison .................................................... 41! Table 6.3.1 - Major Drainage Districts Abbreviations ................................................................................. 43! Table 7.9 - High and Moderate Priority System Improvement Projects and Activities .............................. 62! Appendix Appendix A: Figures! Appendix B: Drainage Areas! Appendix C: Proposed Trunk Storm Sewer Data! Prepared by: Bolton & Menk, Inc. Table of Contents ! Appendix D: Pond Data! Appendix E: Cost Estimates for Proposed Trunk System! Appendix F: Rules and Regulations of the South Washington Watershed District! Appendix G: System Improvements for Water Quality! Prepared by: Bolton & Menk, Inc. Table of Contents ! EXECUTIVE SUMMARY Prepared by: Bolton & Menk, Inc. Executive Summary N14.117158 Page 4 ! ! SECTION I - INTRODUCTION 1.1 OVERVIEW Figure 1 1.2 PURPOSE 1.3 ORGANIZATION Prepared by: Bolton & Menk, Inc. Section I - Introduction N14.117158 Page 5 ! ! Prepared by: Bolton & Menk, Inc. N14.117158 Page 6 ! ! SECTION 2 - LAND AND WATER RESOURCES 2.1 TOPOGRAPHY AND WATERSHEDS Map 1 2.2 LANDUSE Figure 2. Figures 34 Figure 5 Figure 6 Figure 7 2.3 GEOLOGY AND GROUNDWATER !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 1 https://conservancy.umn.edu/handle/11299/178852 accessed December 5, 2018 2 https://stormwater.pca.state.mn.us/index.php?title=Karst accessed December 5, 2018 Prepared by: Bolton & Menk, Inc. Section 2 - Land and Water Resources N14.117158 Page 7 ! ! 2.4 SOILS Figure 8a Table 2.4 - Soil Drainage Characteristics Soil Series Draining Characteristic Hydrologic Soil Group Antigo Well Drained B Ostrander Well Drained B Sparta Excessively Drained A Waukegan Well Drained B Zimmerman Excessively Drained A Figure 8b Prepared by: Bolton & Menk, Inc. Section 2 - Land and Water Resources N14.117158 Page 8 ! ! 2.5 KEY WATER RESOURCES 2.5.1 WETLANDS Figure 9Map 1in Appendix A Prepared by: Bolton & Menk, Inc. Section 2 - Land and Water Resources N14.117158 Page 9 ! ! 2.5.2 LAKES 2.5.3 DRAWS AND RAVINES Prepared by: Bolton & Menk, Inc. Section 2 - Land and Water Resources N14.117158 Page 10 ! ! 2.5.4 STREAMS AND THE MISSISSIPPI RIVER Prepared by: Bolton & Menk, Inc. N14.117158 Page 11 ! ! SECTION 3 - GOALS AND POLICIES 3.1 PURPOSE 3.2 CITY OF COTTAGE GROVE Goal 1:Manage surface and groundwater resources using approaches that meet or exceed regulatory requirements. Policy 1.1 Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 12 ! ! Appendix F. Policy 1.2 Policy 1.3 Policy 1.4 Figure 10 o Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 13 ! ! Goal 2:Provide adequate flood protection for residents and structures and protect the integrity of conveyance channels and stormwater detention areas. Policy 2.1 Policy 2.2 Policy 2.3 Policy 2.4 Policy 2.5 Policy 2.6 Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 14 ! ! Goal 3:Pursue the reduction of Total Phosphorus (TP) and Total Suspended Solids (TSS) loading to water bodies by compliance, municipal management activities, and public education. Policy 3.1 Policy 3.2 Policy 3.3 Policy 3.4 Policy 3.5 Policy 3.6 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 3 https://www.mda.state.mn.us/phosphorus-lawn-fertilizer-law accessed December 7, 2018 Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 15 ! ! Policy 3.7 Policy 3.8 Policy 3.9 Policy 3.10 Goal 4:Classify and effectively manage water bodies in the community to achieve watershed management organization, state, and federal regulatory agency standards. Policy 4.1 Policy 4.2 Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 16 ! ! Policy 4.3 Goal 5:Classify and manage wetlands in the community. Policy 5.1 Policy 5.2 Policy 5.3 Policy 5.4 Figure 9in Appendix A Figure 9in Appendix A Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 17 ! ! Goal 6:Regulate new development and redevelopment activities. Policy 6.1 Policy 6.2 Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 18 ! ! Table 3.2 - Summary of situations where infiltration of stormwater runoff is prohibited or not 4 recommended. Condition Prohibited Not Not recommended recommended unless conditions are 1 met Local rule or ordinance prohibits infiltration X 3 BMP is < 100 feet from drinking well in sensitive aquifer X BMP is < 50 feet from drinking well in a non-sensitive X 3 aquifer BMP receives discharges from vehicle fueling and X maintenance areas 2 There is less than 3 of separation to bedrock or saturated if CGP applies X soil 4 BMP receives discharges from certain industrial facilities if CGP applies BMP is in areas where high levels of contaminants in soil if CGP applies X or groundwater will be mobilized by the infiltrating stormwater BMP is located in D soils if CGP applies X BMP is 1,000 feet up-gradient or 100 feet down-gradient if CGP applies X of active karst BMP is located within an Emergency Response Area in a if CGP applies X DWSMA exhibiting high or very high vulnerability BMP is located within an Emergency Response Area if CGP applies, X (ERA) in a DWSMA exhibiting moderate vulnerability, or unless a higher outside an ERA in a DWSMA exhibiting high or very high engineering vulnerability review indicates infiltration is acceptable BMP is located in soils with infiltration rate > 8.3 in/hr if CGP applies X BMP is located within 1 year travel time of drinking X supply well BMP located within 10 feet of building or structure X BMP located within 35 feet of a septic system X BMP located less than 200 feet from toe of slope that X exceeds 20% BMP receives discharges from a confirmed stormwater X hotspot A groundwater mound formed beneath the BMP during X infiltration extends into the BMP 1 See discussion for conditions under which infiltration is acceptable. 2 CGP = Construction Stormwater General Permit 3 See Minnesota Rules Chapter 4725 4 To determine if infiltration is allowed for a specific industrial sector or subsector, go to the list of sectors, select the sector of interest, and review section 8 for that sector ( ƭĻ ƚŅ LƓŅźƌƷƩğƷźƚƓ 5ĻǝźĭĻƭ ğƓķΉƚƩ LƓķǒƭƷƩźğƌ {ƷƚƩƒǞğƷĻƩ tƚƓķƭ ŅƚƩ {ƷƚƩƒǞğƷĻƩ ƩĻğƷƒĻƓƷ ğƓķ 5źƭƦƚƭğƌ) !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 4 https://stormwater.pca.state.mn.us/index.php?title=Situations_where_infiltration_is_prohibited_or_not_recommended accessed December 7, 2018 Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 19 ! ! Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 20 ! ! Policy 6.3 Policy 6.4 Policy 6.5 Policy 6.6 Policy 6.7 Policy 6.8 Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 21 ! ! 3.3 WATERSHED MANAGEMENT ORGANIZATION REQUIREMENTS 3.3.1 SOUTH WASHINGTON WATERSHED DISTRICT (SWWD) ! Table 3.3.1 - Goals of the SWWD Plan South Washington Watershed District Policy Cottage Grove Comment or Proposed Action Goal: Minimize existing and future potential damages to Goal 2, property, public safety, and water resources due to flood Policy 2.1, 2.2, 2.3, 2.4, 2.5 events (Including the Cottage Grove Central Draw, West Draw intercommunity flow limits, and Clear Channel Pond storage expansion). Goal: Complete establishment of a controlled overflow from Goal 2, Policy 2.1, 2.2, 2.3, 2.4, 2.5 (Central Draw Storage Facility and Overflow project). Goal: Protection and restoration of SWWD resources to Goal 1, 3, 4, 6 meet local resource goals and State standards. Policy 1.1, 1.2, 3.1, 3.2, 3.3, 3.4, 3.6, 4.1, 5.2, 6.1 Goal: Prevent resource degradation of SWWD resources Goal 1, 3, 6 Policy 3.2, 3.3, 5.2, 6.1, 6.3, 6.8 from bluff, streambank, shoreland, and construction site erosion. Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 22 ! ! ! Table 3.3.1 - Goals of the SWWD Plan (continued) South Washington Watershed District Policy Cottage Grove Comment or Proposed Action Goal: Implement conservation efforts to ensure long-term Goal 1 viability of groundwater resources in South Washington Policy 1.3, 2.4, 3.9, 6.1, 6.2, 6.3 County. Goal 1 Goal: Protect groundwater resources through pollution Policy 1.1, 1.3, 2.4, 3.8, 3.9, 3.10, 6.1, 6.2, 6.3, 6.8 prevention and management of surface water groundwater interactions. Goal: Protect, restore, and reconstruct native terrestrial and Policy 5.2, 5.3, aquatic habitat for the benefit of resource management. Goal: Facilitate increased resilience of SWWD resources and Goal 1, 2 Policy 1.3, 2.1, 2.2, 2.3, 2.6, 3.1, public infrastructure through development of information and strategies and implementation of accepted climate adaptation practices. Goals: Goal 1, 2 Policy 2.3, 6.7 operate a monitoring program adequate to establish baseline monitoring programs and appreciates the value of water quality and quantity measures and identify long-term the monitoring data for calibration and verfiication trends. of hydrology and hydraulic models. in loading rates as a result of SWWD implementation actions. Goal: Maintain updated, district-wide hydrological modeling Goal 1, 2 Policy 2.1, 2.3, to inform SWWD and municipal management of resources and infrastructure. Goal: Work with local and regional partners to advance Goal 1, Policy 3.3, 3.10, 6.8 knowledge of watershed management issues. Goal: Heighten the awareness of key constituencies within Goal 1, 3, 4 Policy 3.1, 3.3, 3.4, 3.5, 3.8, 3.10, 4.2 the SWWD, sufficient to modify behavior to improve the -MS4 permit. recognition and implementation of SWWD policies, programs, and activities. Goal: Utilize a Results Based Accountability approach in Noted: No proposed action evaluating and refining implementation strategies for achieving resource goals and to evaluate and improve program performance. Goal: Establish and maintain controls necessary to achieve Goal 1, 2, 4, 6 Policy 1.1, 1.3, 2.4, 4.1, 5.2, 5.3, 6.1, 6.8 established SWWD resource goals, comply with mandated permits and programs, and maximize regulatory consistency with neighboring jurisdictions. Noted: No proposed action Goals: by the SWWD and its state and local partners by improving collaboration and coordination of efforts. . 3.4 STATE AND FEDERAL AGENCY REQUIREMENTS Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 23 ! ! 3.4.1 MINNESOTA DEPARTMENT OF NATURAL RESOURCES (DNR) Figure 9 Figure 9 Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 24 ! ! 3.4.2 U.S. ARMY CORPS OF ENGINEERS (USACE) 3.4.3 BOARD OF WATER AND SOIL RESOURCES (BWSR) 3.4.4 MINNESOTA POLLUTION CONTROL AGENCY (MPCA) Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 25 ! ! 3.4.5 STATE AND FEDERAL JURISDICTIONAL BOUNDARIES FOR PUBLIC WETLANDS AND WATERS 3.5 AGENCY STORMWATER PUBLICATIONS 3.6 AGENCY CONTACTS Prepared by: Bolton & Menk, Inc. Section 3 - Goals and Policies N14.117158 Page 26 ! ! SECTION 4 - WETLAND PROTECTION AND MANAGEMENT 4.1 WATERSHED MANAGEMENT ORGANIZATIONS 4.2 WETLAND ASSESSMENT 4.3 WETLAND MANAGEMENT STANDARDS Figure 9 Prepared by: Bolton & Menk, Inc. Section 4 - Wetland Protection and Management N14.117158 Page 27 ! ! Table 4.3 - Wetland Management Classification Management Classification Number of Wetlands Stormwater Conveyance 10 Protect 23 Manage I 21 Manage II 15 Filled 9 No Access 1 Lake 3 4.3.1 WATER QUALITY 4.3.2 WATER QUANTITY Prepared by: Bolton & Menk, Inc. Section 4 - Wetland Protection and Management N14.117158 Page 28 ! ! Table 4.3.2 - Wetland Community Susceptibility to Stormwater Impacts* Highly Susceptible Wetland Moderately Susceptible Slightly Susceptible Least Susceptible Types Wetland Types Wetland Types Wetland Types Sedge Meadow Shrub-carrs Floodplain Forests Gravel Pits Open Bogs Alder Thickets Fresh (Wet) Meadows Cultivated Hydric Soils Coniferous Bogs Fresh (Wet) Meadows Shallow Marshes Dredged Material/ Fill Material Disposal Sites Fill Material Disposal Sites Calcareous Fens Shallow Marshes Deep Marshes Low Prairies Deep Marshes Coniferous Swamps Lowland Hardwood Swamps *Guidance for Evaluating Urban Storm-Water and Snow-Melt Runoff Impacts on Wetlands (Minnesota Storm Water Advisory Group, 1997) 4.3.3 BUFFERS 4.3.4 WETLAND MITIGATION Prepared by: Bolton & Menk, Inc. Section 4 - Wetland Protection and Management N14.117158 Page 29 ! ! 4.4 SUMMARY OF WETLAND MANAGEMENT STANDARDS Table 4.4 - Wetland Management Standards for Wetlands within SWWD Criteria Protect Manage I Manage 2 Within a Critical Stormwater Conveyance Corridor Water Quality Phosphorus Inflow Load Maintain 60% post- 60% post- Based on Management (average annual pounds) predevelopment development load development load Classification reduction reduction Water Quantity Storm bounce Existing plus 12 No limit Existing To be determined 10-year rainfall (4.2-1.0 foot inch) Discharge rate (inflow) 12 Existing or less Existing or less 2-year (2.8-inch) & Existing To be determined 100-year (6.3-inch) rainfall Inundation period Existing plus 2 Existing plus 7 12 Existing To be determined 1-year rainfall (2.4- days days inch) Inundation period Existing plus 14 Existing plus 14 12 Existing To be determined 2-year rainfall (2.8- days days inch) 0 to 1.0 feet 0 to 4.0 feet Run-out control Based on Management No change above existing run above existing elevation (free Classification out run out flowing) Run-out control Based on SWWD Based on SWWD Based on SWWD Based on Management elevation (landlocked) Floodplain Map Floodplain Map Floodplain Map Classification Buffer Width Based on Management Wetlands <1 acre 75 feet 50 feet 25 Classification feet Based on Management Wetlands >1 acre 100 feet 75 feet 50 Classification feet Impact Mitigation Based on Management Area 3:1 2:1 2:1 Classification replacement ratio Based on Management Volume 2:1 2:1 2:1 Classification replacement ratio 1 conditions which established the current wetland. 2 This standard will be determined at a later time based on a mutual agreement between the City and SWWD. Prepared by: Bolton & Menk, Inc. Section 4 - Wetland Protection and Management N14.117158 Page 30 ! ! 4.5 PROCEDURES FOR WETLANDS NOT INVENTORIED Prepared by: Bolton & Menk, Inc. N14.117158 Page 31 ! ! SECTION 5 - WATER QUALITY ASSESSMENT 5.1 BACKGROUND 5.2 SYSTEM IMPROVEMENTS FOR WATER QUALITY 5.3 WATER QUALITY CASH DEDICATION Prepared by: Bolton & Menk, Inc. Section 5 - Water Quality Assessment N14.117158 Page 32 ! ! o o o o Prepared by: Bolton & Menk, Inc. Section 5 - Water Quality Assessment N14.117158 Page 33 ! ! 5.4 TOTAL MAXIMUM DAILY LOADS AND IMPAIRED WATERS Figure 11 Prepared by: Bolton & Menk, Inc. Section 5 - Water Quality Assessment N14.117158 Page 34 ! ! Table 5.4 - 303(d) List of Impaired Waters within the City of Cottage Grove Water Body City Ponding Year First Assessment Affected Use Pollutant or Stressor TMDL Designation Listed Unit ID # Complete Unnamed N/A 2002 07010206-517 Aquatic life Fish Bioassessments Yes Creek (East Ravine) Ravine Park ER-P5.4 2006 82-0087-00 Aquatic Nutrient/Eutrophication Yes Lake recreation Biological Indicators 1 Mississippi N/A 1998 07010206-814 Aquatic Mercury in fish tissue Yes River (Upper consumption Mercury in water approved St Anthony column for Falls to St Pcb in fish tissue Mercury Croix R) Perfluorooctane sulfonate (pfos) in fish tissue Perfluorooctane sulfonate (pfos) in water column 2017 07010206-814 Aquatic life Nutrients Yes Total suspended solids approved for TSS 2017 07010206-814 Aquatic Fecal coliform No recreation Lake St. N/A 2008 Aquatic Excessive Yes Croix recreation Nutrients/Phosphorus 1 A state-wide mercury TMDL study was approved in 2008 Figure 12 5.5 NPDES MS4 PERMIT PROGRAM !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 5 https://www.pca.state.mn.us/data/whats-my-neighborhoodaccessed December 5, 2018 Prepared by: Bolton & Menk, Inc. Section 5 - Water Quality Assessment N14.117158 Page 35 ! ! 5.6 RECOMMENDATIONS Prepared by: Bolton & Menk, Inc. N14.117158 Page 36 ! ! SECTION 6 - WATER QUANTITY ASSESSMENT 6.1 TECHNICAL BACKGROUND Map 1 6.1.1 DESIGN STORM Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 37 ! ! 6.1.2 HYDROLOGIC DESIGN PARAMETERS Table 6.1.2 - Runoff coefficients and Curve Numbers for Future Land Use Runoff Coefficient C Land Use Type CN Value 5-Year Bluff/Ravine 0.14 55-58 Public/Open Space 0.17 61 Rural Residential 0.23 66 Low Density Residential 0.38 75 Medium Density Residential 0.59 85 High Density Residential 0.66 88 Commercial/Industrial 0.71 90 Ponds 1.0 100 Special As required by the City Engineer 6.1.3 CONVEYANCE SYSTEM DESIGN PARAMETERS Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 38 ! ! o o o o o Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 39 ! ! 6.1.4 PONDING DESIGN PARAMETERS Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 40 ! ! 6.2 STORMWATER MODELING OVERVIEW Figure 5 Table 6.2 - 2030 vs. 2040 Future Land Use Curve Number Comparison Drainage District 2030 Comp. CN 2040 Comp. CN Central Draw District 71 71 East Draw District 71 71 East Ravine District 73 73 Gable Lake District 65 66 Grey Cloud Island District 65 65 Langdon District 85 85 Lower St Croix District 60 60 Seeger Creek District 65 64 South District 73 81 Southwest District 72 74 St. Paul Park District 72 72 Thompson Grove District 79 79 West Draw District 73 73 Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 41 ! ! Figure 13 6.3 SYSTEM ANALYSIS AND RECOMMENDATIONS 6.3.1 GENERAL Map 1 Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 42 ! ! Table 6.3.1 - Major Drainage Districts Abbreviations Major Drainage District Abbreviation Central C East Draw ED East Ravine ER Gables Lake GL Grey Cloud Island GCI Langdon L Lower St. Croix LSC St. Paul Park SPP Seeger Creek SC South S Southwest SW Thompson Grove TG West Draw WD Appendix A Map 1 Map 1Figure 15 Appendix C Appendix D Appendix E 6.3.2 CENTRAL DISTRICT 6.3.3 EAST DRAW DISTRICT Map 1 Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 43 ! ! 6.3.4 EAST RAVINE DISTRICT Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 44 ! ! 6.3.5 GABLES LAKE DISTRICT Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 45 ! ! 6.3.6 GREY CLOUD ISLAND DISTRICT 6.3.7 LANGDON DISTRICT Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 46 ! ! Appendix E 6.3.8 LOWER ST. CROIX DISTRICT 6.3.9 ST. PAUL PARK DISTRICT Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 47 ! ! o o o o o o 6.3.10 SEEGER CREEK DISTRICT Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 48 ! ! 6.3.11 SOUTH DISTRICT 6.3.12 SOUTHWEST DISTRICT Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 49 ! ! 6.3.13 THOMPSON GROVE DISTRICT 6.3.14 WEST DRAW DISTRICT Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 50 ! ! 6.4 HIGH PRIORITY STORMWATER QUANTITY RECOMMENDATIONS Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 51 ! ! Prepared by: Bolton & Menk, Inc. Section 6 - Water Quantity Assessment N14.117158 Page 52 ! ! SECTION 7 - IMPLEMENTATION 7.1 GENERAL 7.2 REGULATORY ADMINISTRATIVE RESPSONSIBILITIES 7.2.1 EROSION AND SEDIMENT CONTROL Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 53 ! ! 7.2.2 PRELIMINARY AND FINAL PLATTING PROCESS 7.2.3 FLOODPLAIN ORDINANCE Figure 14 7.3 EDUCATION 7.3.1 GENERAL 7.3.2 CITY STAFF Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 54 ! ! 7.3.3 CITY RESIDENTS Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 55 ! ! 7.3.4 DEVELOPMENT COMMUNITY 7.4 OPERATION AND MAINTENANCE 7.4.1 STORMWATER BASINS Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 56 ! ! Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 57 ! ! 7.4.2 SUMP MANHOLES AND SUMP CATCH BASINS 7.4.3 STORM SEWER INLET STRUCTURES 7.4.4 PIPING SYSTEM Figure 15 o o Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 58 ! ! 7.4.5 OPEN CHANNELS Figure 16 7.4.6 DE-ICING PRACTICES 7.4.7 STREET SWEEPING 7.4.8 LITTER CONTROL 7.4.9 VOLUME CONTROL BMPS 7.4.10 STRUCTURAL STORMWATER BMPS Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 59 ! ! 7.5 TRUNK SURFACE WATER SYSTEM COSTS Map 1 Appendix E 7.6 FINANCING Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 60 ! ! 7.7 AMENDMENT PROCEDURES 7.8 ANNUAL REPORT TO COUNCIL 7.9 SYSTEM IMPROVEMENT PROJECTS AND ACTIVITIES Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 61 ! ! Table 7.9 Table 7.9 Table 7.9 - High and Moderate Priority System Improvement Projects and Activities Project Description Estimated Cost Priority Comments Apply and Review development Costs for development reviews High On-going Enforce and redevelopment is borne by the applicant. Costs Watershed projects for compliance for administration and District Rules with this Plan and the coordination with watershed is and Standards Rules & Standards of the $10,000 to $20,000 per year. Watershed District Evaluate Review and comment on $10,000 - $20,000 for Periodic. Evaluate Watershed new Watershed District City staff and City High as SWWD District standards, rules, and Attorney/Consulting standards manual standards, guidance documents as Assistance and rules are rules, and necessary to address updated and guidance concerns regarding City enacted documents compliance Operation and $100,000 in annual inspections, High On-going Maintenance of system is a Multi-Million operation, maintenance, repairs the Stormwater Dollar infrastructure and replacements which System constructed to collect, includes 110 miles of storm convey, store and treat drain pipes, over 100 runoff from the City stormwater ponds and associated items Street Street Sweeping of 167 $35,000 per year High On-going Sweeping miles of City Streets once per year MS4 and The City of Cottage SWPPP Grove is an NPDES MS4 Implementation community. The NPDES MS4 permit and SWPPP require the BMP activities listed below: Maintain Storm Sewer $5,000 to $10,000 per year Moderate On-going Base Map and GIS System Public Education and $5,000 per year Moderate On-going Outreach: Continue to work with the Watershed and the East Metro Water Resources Education Program Public Participation $2,000 per year Moderate Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 62 ! ! ! Table 7.9 - High and Moderate Priority System Improvement Projects and Activities (continued) Project Description Estimated Cost Priority Comments Illicit Discharge $3,000 per year Moderate On-going Detection and Elimination Construction Site Coordinate with SWWD on Moderate On-going Stormwater Runoff inspections. Project costs Control Post Construction Development or project costs Moderate On-going Stormwater Management Pollution Prevention $5,000 per year Moderate On-going Good Housekeeping for Municipal Operations Hydrogeologic Complete site or $1,500 for specific sites, $5,000 High Complete within 2 Assessments of regional hydrogeologic for regional assessments years of adoption Infiltration in assessments of of SWMP by City DWSMA stormwater infiltration Council Central Draw Coordinate with the Storage Facility SWWD in the design and Financed by the SWWD High Regional Outlet installation of the SWWD outlet for pond ER-P2 (CD- P86) Regional Maintain and improve Project funding primarily borne Moderate Ongoing Stormwater the Ciby permit applicants and Models Stormwater Models development projects Lake Robert Complete permitting $5,000 to $10,000 for Moderate Complete in and construct outlet permitting, Outlet pipe costs to conjunction with Woods Pond) be determined adjacent Outlet development ER-P3 and ER-Coordinate with the ER-P3 outlet to utilize CDSF Moderate ER-P3 outlet P4 Outlets SWWD in the design and outlet pipe designed and dependent on installation of the financed by SWWD. ER-P4 SWWD CDSF SWWD outlet for pond outlet to be determined timeline ER-P3. Complete design, permitting and construct outlet for ER-P4 ER-P11 Complete design, $400,000 Moderate Development permitting and construct driven timeline outlet to L-P3 L-P3 Storage, Include 3M, SWWD and $3,000,000 Moderate Complete with Outlet and others to explore future County Conveyance options for storage, roadway project conveyance, water quality and natural resource protection. Design and construct solutions ! ! Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 63 ! ! Table 7.9 - High and Moderate Priority System Improvement Projects and Activities (continued) Project Description Estimated Cost Priority Comments West Draw The City will work with Necessary storage ponds will be High Ongoing with Inter-Woodbury and SWWD completed along with development Community to address existing 200 development projects Flow Limit cfs flow and 25 cfs limit Gateway Pond Implement the $1,890,000 Work with MnDOT, (SPP-P9) necessary Moderate MnDNR, City of St. Improvements improvements to the Paul Park, SWWD, Gateway Pond and Canadian Pacific Railroad to develop a joint funding strategy Thompson Construct a quality $1,640,000 Other water Grove water treatment pond Moderate quality BMPs quality pond adjacent to the Hamlet should also be Park Pond system to investigated provide treatment for some of the tributary residential area Jamaica Avenue $250,000 Moderate Cost estimate box culvert under Jamaica Ave includes box and provide stabilized culvert and conveyance to L-P3 channel stabilization to L-P3 Update long-Update the water $6,000 - $12,000 for City staff Complete within term system quality system time and consulting time High two years of improvements improvements costs CIP adoption of this for water from 2000 to reflect SWMP by City quality new priorities in the Council volume control Prepared by: Bolton & Menk, Inc. Section 7 - Implementation N14.117158 Page 64 ! ! SECTION 8 - SUMMARY AND RECOMMENDATIONS 8.1 SUMMARY Map 1 8.2 RECOMMENDATIONS Prepared by: Bolton & Menk, Inc. Section 8 - Summary and Recommendations N14.117158 Page 65 ! ! SECTION 9 - REFERENCES Prepared by: Bolton & Menk, Inc. Section 9 - References N14.117158 Page 66 ! ! SECTION 10 - GLOSSARY OF TECHNICAL TERMS Prepared by: Bolton & Menk, Inc. Section 10 - Glossary of Technical Terms N14.117158 Page 67 ! ! Prepared by: Bolton & Menk, Inc. Section 10 - Glossary of Technical Terms N14.117158 Page 68 ! ! Prepared by: Bolton & Menk, Inc. Section 10 - Glossary of Technical Terms N14.117158 Page 69 ! ! Appendix A: Figures ! Regional Location Map 2018 Surface Water Management Plan Cottage Grove, MN January 2019 Isanti Co Sherburne Co Chisago Co Anoka Co Wright Co Hennepin Co Washington Co Ramsey Co St. Paul Minneapolis Carver Co Cottage Grove Scott Co Dakota Co Sibley Co Legend ! 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C PZE FWB!FOJBMC C B SF U C B S O F 36!ZBXIHJI FW BBS B F PS T!MSU!USFC FWB!OPSLB Map Document: \\\\Arcserver1\\gis\\COTT\\N14117158\\ESRI\\Maps\\COTT_SW07_Watershed_11x17.mxd | Date Saved: 1/30/2019 9:40:42 AM evAlaeN S vAnagroM Se ManningAveS SevAram aL K Stae es vA Sn evA A SevAaciama Do S SevA doow nI s n d y S evA laedI r D re woT SevAn otniH S e e evA tel aH SevAyelda H sA w e M Tr r ne vA danar ev S DixonD G SevAaveneG evA nlocniL Por tla ht5 tS ht4 tS S dr3 t Ave t 7 dnalsIduolCyerG e vA ht5 ts1 tS dr3 evA evA ht4 s reRippissi vi Y RD R VE R W EVAN AWNWAD E G RATNO DRF OLC AM EVA NOTYALC C AL KR R D C EBLVD S E V EMR CAHILL H E B DYO R Y E AV INE L B A RE T HIG B A O A 9 RT TREBOR S L EVA NORKA Map Document: \\\\arcserver1\\gis\\COTT\\N14117158\\ESRI\\Maps\\COTT_SW15_SoilSeries_11x17.mxd | Date Saved: 1/17/2019 4:05:21 PM Nb Nboojoh!Bwf!T opu T!fwB!sb nbM tc s l fL b TfwBtu e B w z B TfwBbd f mtJ T T!fw B!eppx oJ w T e T! fwB!mb feJ T!fw B!opuoj I wBttf f T f f TfwB n fw tB b H s f f H ebobs s EjypoE T!fwB!bwfofH fwB!ompdojM 5ui!Tu es4 uT! Bwf eobmtJevpmDzfsH T!eo3 u fwB!iu6 T!ojbN u !es4 fwB Z MWE C O FWBX XOX BE FH B PSG PVTF DSUI PV D FWBOPUZBM LS ESB MD V XFE F FWB B MMJIBD FWB! C FWB!FOJBMC C B SF U 36!ZBXIHJI S F F B B F PS T!MSU!USFC FWB!OPSLB Map Document: \\\\Arcserver1\\gis\\COTT\\N14117158\\ESRI\\Maps\\COTT_SW08_HydrologicSoils_11x17.mxd | Date Saved: 1/30/2019 9:43:37 AM Nb Nboojoh!Bwf!T opu T!fwB!sb nbM Ljo l fL b TfwBtu B w z B TfwBbd f mtJ T T!fw B!eppx oJ w T e T! fwB!mb feJ T!fw B!opuoj I wBttf f T f f TfwB n fw tB b H s f f H ebobs bsH s EjypoE T!fwB!bwfofH fwB!ompdojM Qpsumb u uT! iu5 es4 uT! Bwf eobmtJevpmDzfsH T!eo3 u fwB!iu6 T!ojbN u !es4 fwB Z MWE C O FWBX XOX BE FH B PSG D FWBOPUZBM LS ESB MD V XFE E F FWB B MMJIBD FWB! C FWB!FOJBMC C36!ZBXIHJI B SF U S F F B B F PS T!MSU!USFC FWB!OPSLB Map Document: \\\\Arcserver1\\gis\\COTT\\N14117158\\ESRI\\Maps\\COTT_SW09_Wetlands_11x17.mxd | Date Saved: 1/17/2019 2:02:35 PM S rT xiorC tniaS eergkaO vAn Se Sev An eergk aO evAlaeN S nagroM SevA vorG egattoC rD e S evAramaL v A o r b m i K L rD yrubdooW taeK As Sev J e 1 Sn evA yA rD eliM SevAaciaaJ rD reenoiP el sI S S evAd oownI sdI dy rD rewoT Se vAl aed SevAl aedI SevAnot niH o S ra H v eevAtel rD enaldooW SevAyeldaH A Tr m r ner vA G r e C Dixon a vA yrutneCSevAaveneGevA nlocn eiL 10 tS dr3 ednalsIduolCyerG vA ht8 S ts1 t e v A evA ht5 3rd Ave evA dn2 r eviRippissi ssi a aLr Y L R T N A M K IC D T EVANW A M AWNWAD AVES ORDS C OL AM REG DATF EVA NOTYALCNOR SEVATS1 SEVADN2 S EVADR 3 DRKR A SEVAHT5 EV SEVA HT6EMR SEVAHT7 SEVAHT8 SEVAHT9 H E B DYO S EVAHT11 R SEVAHT21 SEVAHT31 SE VAHT41 ENIAL SEVAHT 81 B ARS ET HIG DR B A EVA ELADKAO D A 9 ROBERT ST S E TGNI S EVA NORKA S LRT TREBOR A P EVA ONREVLA LR ONTRL S CAB EVA IDRA EVA ER AWALED T R E B O R NLS C DR D DOD A R NILLOCEK IM RT Map Document: \\\\arcserver1\\gis\\COTT\\N14117158\\ESRI\\Maps\\COTT_SW12_WaterDistribution_11x17.mxd | Date Saved: 1/17/2019 4:20:40 PM evAlaeN S vAnagroM Se ManningAveS SevAram aL K Stae es vA Sn evA A SevAaciama Do S SevA doow nI s n d y S evA laedI r D re woT SevAn otniH S e e evA tel aH SevAyelda H sA w e M Tr m r ne vA danar ev S noxiD G a SevAaveneG evA nlocniL Portl an ht5 tS ht4 tS S dr3 t Ave t 7 dnalsIduolCyerG e vA ht5 ts1 tS dr3 evA evA ht4 s reRippissi vi Y RD R VE R W EVAN AWNWAD E G RATNO DRF OLC AM EVA NOTYALC C AL KR R D C EBLVD S E V EMR CAHILL H E B DYO R Y E AV INE L B A RE T HIG B A O A 9 RT TREBOR S L EVA NORKA Map Document: \\\\arcserver1\\gis\\COTT\\N14117158\\ESRI\\Maps\\COTT_SW10_ImpairedWaters_11x17.mxd | Date Saved: 1/17/2019 4:26:55 PM evAlaeN S vAnagroM Se ManningAveS SevAram aL K Stae es vA Sn evA A SevAaciama Do S SevA doow nI s n d y S evA laedI r D re woT SevAn otniH S e e evA tel aH SevAyelda H sA w e M Tr m r ne vA danar ev S noxiD G a SevAaveneG evA nlocniL Portl an ht5 tS ht4 tS S dr3 t Ave t 7 dnalsIduolCyerG e vA ht5 ts1 tS dr3 evA evA ht4 s reRippissi vi Y RD R VE R W EVAN AWNWAD E G RATNO DRF OLC AM EVA NOTYALC C AL KR R D C EBLVD S E V EMR CAHILL H E B DYO R Y E AV INE L B A RE T HIG B A O A 9 RT TREBOR S L EVA NORKA Map Document: \\\\arcserver1\\gis\\COTT\\N14117158\\ESRI\\Maps\\COTT_SW11_WIMN_11x17.mxd | Date Saved: 1/17/2019 4:39:51 PM Map Document: H:\\COTT\\N14117158\\GIS\\Maps\\COTT_SW16_ModelingMap_11x17.mxd | Date Saved: 1/17/2019 3:56:34 PM evAlaeN S vAnagroM Se ManningAveS SevAram aL K Stae es vA Sn evA A SevAaciama Do S SevA doow nI s n d y S evA laedI r D re woT SevAn otniH S e e evA tel aH SevAyelda H sA w e M Tr m r ne vA danar ev S noxiD G a SevAaveneG evA nlocniL Portl an ht5 tS ht4 tS S dr3 t Ave t 7 dnalsIduolCyerG e vA ht5 ts1 tS dr3 evA evA ht4 Y RD R VE R W EVAN AWNWAD E G RATNO DRF OLC AM EVA NOTYALC C AL KR R D C EBLVD S E V EMR CAHILL H E B DYO R Y E AV INE L B A RE T HIG B A O A 9 RT TREBOR S L EVA NORKA Map Document: \\\\arcserver1\\gis\\COTT\\N14117158\\ESRI\\Maps\\COTT_SW13_FEMAFloodplain_11x17.mxd | Date Saved: 1/18/2019 9:56:27 AM evAlaeN S vAnagroM Se ManningAveS SevAram aL K Stae es vA Sn evA A SevAaciama Do S SevA doow nI s n d y S evA laedI r D re woT SevAn otniH S e e evA tel aH SevAyelda H sA w e M Tr m r ne vA danar ev S noxiD G a SevAaveneG evA nlocniL Portl an ht5 tS ht4 tS S dr3 t Ave t 7 dnalsIduolCyerG e vA ht5 ts1 tS dr3 evA evA ht4 s reRippissi vi Y RD R VE R W EVAN AWNWAD E G RATNO DRF OLC AM EVA NOTYALC C AL KR R D C EBLVD S E V EMR CAHILL H E B DYO R Y E AV INE L B A RE T HIG B A O A 9 RT TREBOR S L EVA NORKA Map Document: \\\\arcserver1\\gis\\COTT\\N14117158\\ESRI\\Maps\\COTT_SW14_ExistingStorm_11x17.mxd | Date Saved: 1/18/2019 10:03:48 AM Map Document: H:\\COTT\\N14117158\\GIS\\Maps\\COTT_SW19_CriticalBasinLocationMap.mxd | Date Saved: 1/29/2019 5:42:48 PM 3129!Tvsgbdf!Xbufs!Nbobhfnfou!QmboSfhjpobm!Tvsgbdf!Xbufs!Esbjobhf Kbovbsz-!312: Dpuubhf!Hspwf-!NO 36 HYWX 27 HYWX Regional Surface Water Drainage Legend ! I County BoundaryExisting Storm Sewer ParcelPreliminary Pipe Alignment Rivers and StreamsProposed Basin Locations K J Ú\[Proposed Lift Station General Drainage Direction Proposed Force Main Drainage District Areas Existing Storm Water Management Features 5:5 &)(' PWI Waterway Central Draw District Constructed Basin - Dry East Draw District 83 Constructed Basin - Wet HYWX East Ravine District Constructed Channel Gables Lake District 54 82 HYWX TU Constructed Infiltration Feature Grey Cloud District Constructed Treatment Structure Langdon District Constructed Wetland Lower St. Croix District 2: HYWX Natural Depression Seeger Creek District Underground Stormwater Storage South District Southwest District 29 HYWX St. Paul Park District 31 Thompson Grove District La Lake HYWX West Draw District Map 1 00.51 Miles Source: Met. Council, City of Cottage Grove, Washington County, MnDOT WBRY-1 WBRY-2 GL-A1 :6 WD-A2 @AAB GL-P1.2 WD-P6.1 WD-P1 WD-A9.2 WD-P9.1 WD-A1 WD-P9.2 WD-A6 WD-A4.7WD-A9.4 WD-A9.1 WD-P9.4 WD-P2 WD-A4.3WD-P9.3 WD-A5 WD-P6.2 WD-P1 WD-A9.3 ER-P1.4 WD-A10.1ER-P2.1 WD-A7 WD-P6.3 WD-P4.3 ER-A1 WD-A4.3WD-P4.4 WD-P3 WD-P10.2 WD-A9.5 WD-A4.4 WD-P3.1WD-P4.2 WD-A4.5 WD-A3 WD-A4.2WD-A10.3WD-P10.1A WD-P4.5 WD-P10.1 WD-P9.5 WD-P10.3ER-P2.3 WD-A8WD-A10.2 GL-P1 WD-P4.1 SPP-A1 GL-P1.1 WD-P15.3 WD-A4.1 Ú\[ C-P1.1 C-P1.2 WD-A4.6 WD-A15.3 GL-P1.4 ER-P1.1ER-A2 85 TU WD-P13.1WD-A11.1ER-P1 WD-P10.4 WD-A13.1 WD-P11.1 SPP-P1WD-P13.2 WD-P11.3 ER-P2.5GL-P1.3 WD-A13.2WD-A12 WD-A11.3WD-A15.4 SPP-A1.1 WD-P11.2WD-P12WD-A10.4 SPP-A2ER-P1.3 WD-A11.2 C-A1ER-P1.2 WD-P13.3 WD-A13.3 49 SPP-P2WD-P15.4 HYWX SPP-P1.1WD-P13.4 LSC-A1 WD-A13.4 WD-P13.5 WD-A15.5 WD-A13.5 SPP-A3 SPP-P4.1 SPP-A4.1 24 WD-P15.5 HYWX WD-A13.6WD-A13.7 C-P1 WD-P13.7 SPP-10WD-P15.5 SPP-A4.2 SPP-P3 WD-P13.7 SPP-P4.2 WD-P13.6 SPP-P3.2 ED-P1 WD-P15.1 33 SPP-P3.1 ED-A3.1 HYWX WD-P15.6 C-A2 WD-A15.1 C-A6 ED-A1 WD-P14.1 ER-A3 ED-P3.1 WD-A15.6 C-P6.1 ED-A2.1 WD-A14.1 SPP-A5 C-P2 WD-P14.2 WD-P15.7 C-A5 WD-P14.1 WD-A15.2 WD-P15.2 WD-P15.6.1 WD-A14.2 SPP-P5 SPP-P9.2ED-P2.1 WD-A16 WD-P15.7.1WD-A15.7ED-A3.2 WD-P17 C-A3 ED-A2.2 WD-P16.1 ED-P2.2 SPP-A6WD-P16 C-P6.2 WD-A19.1 C-P3 C-A4 WD-A17 ED-P3.2 C-P5 SPP-P6ER-P3 SPP-P8 WD-P19.1 WD-A19.2ER-A4 ED-A5 SPP-P6 LSC-A3 C-P6.3 SPP-A9.2 WD-P19.2 TG-P4.12 C-P4 WD-A18.2 ED-P5.1 ER-P4 4:ED-A4.1 SPP-A7.3ED-P4.1 WD-A18.1 HYWX ED-P4.1.1 WD-A19.3WD-P18.2 LSC-P2.5 \[TG-A1.1 Ú SPP-A7.4C-P4 WD-P18.1 SPP-P9.2 ED-P5.2 SPP-P7.4WD-P18.3 WD-P19.3 SPP-P7.3 SPP-A7.2 SPP-P9.1 TG-P1.1 C-A7 ER-A5.1 WD-A18.3 SPP-P7.2ER-P5.1 TG-A1.2 ER-A5.2LSC-P2.4 TG-A1.4 SPP-P7.5 ED-A4.2 ER-P5.2 SPP-A9.1 TG-A1.3 SPP-A8TG-P4.5 SPP-A7.1 SPP-P9.2A TG-P1.2 C-P7ER-P4 TG-P1.4 ED-P4.2ER-A5.3 SPP-A7.5 TG-P1.3 C-P7.1 ER-P5.3 ED-P5.3 Ú\[ SPP-A9.2AC-P7.3 C-P8 LSC-A2 TG-P4.6 LSC-P2.3 TG-A3 TG-A2 C-A8ED-A6 TG-P4 TG-P4.8 TG-P2 2: HYWX TG-P4.10.3 ED-A8 TG-P4.10.4 TG-P3 TG-P4.10.1TG-P4.10.2 LSC-P2.1 TG-P4LSC-P2.2 ED-P8 TG-A4LSC-P2.4 ED-P6 ED-A10 ED-P7 LSC-P2.5 TG-P4 TG-P4.9.14 ED-P9.1 ED-A9.2 ED-A7 ED-P9.2 ED-A9.1 ED-P9.3 ED-P9.4LSC-A4 ED-A9.4 21 ED-P10 *+ SW-A1 TG-P4 ER-P5.7 SW-A2 ER-A5.4 L-A2.2 SC-A3.1 ER-P5.9 TG-A5.1 ER-P5.5 TG-P4 KJ L-P2 ER-P5.6 ER-P5.8 TG-P4.1 TG-P4.8 KJ 87 TG-P14.1L-P2 SW-P2 TU SW-A4 KJ SW-P4.2 SW-P4.1 L-A3 TG-P4 SW-P4.3 SW-P4.4L-A2.1 L-P3.5 SW-A3TG-P4.11 TG-A14 TG-P14.3 ER-P5.4.1 KJ TG-P5.1 SW-A5 SC-A1.2 L-P3.4 TG-P14.2L-P3.6 SW-P5.3 SW-P5.5 TG-P19 SW-P5.4 SW-P5.2 L-P3.7 SW-P5.1 KJ L-A1 SW-A6 TG-A5.2 SW-P9.1 L-P3.1 ER-P5.4.3 L-P1 TG-P14.4 L-P3.3 TG-P15 72 TG-A19 SC-A3.2 ER-P5.4.2 *+ TG-A15 TG-P19.1 ER-P9.1ER-A9.1 TG-P14 SW-A8 ER-A9.4 TG-P10 SW-A9 TG-P13.1TG-A16ER-A9ER-P5.4.7 KJ TG-A11 SW-A7 TG-P19SC-A1.1 KJ SW-P9.2TG-A10 SW-A11.1TG-P13.3 ER-P5.4.6 TG-A6ER-A9.2 TG-P9 K TG-A9TG-A13.1ER-A11 J TG-P16 ER-A9.3 TG-A13.2 SC-A1.3 TG-A18 SW-P11.1 ER-P9.2 TG-P18 TG-P8 TG-P12 TG-P12.5ER-P9.3 K J TG-P17 TG-P12.1 TG-A8 TG-A20ER-P9.4 TG-P12.4 TG-A12 SW-P11.2 SW-A12 ER-P5.4.4 JK SW-A10 TG-A17 SW-P8.1 SW-A11.2 ER-P5.4.5 TG-P7 KJ L-P3 TG-A7 SW-P12 KJ SW-P8.2 SC-P2.1 ER-P5.4 KJ KJ ER-A12 SW-A14 SW-A13 SW-P13 KJ SW-A15 ER-P7.1 SC-P2.2 SW-P14 ER-A13 ER-A7 SW-A16 JK ER-P7 S-A4 KJ S-A3 ER-A6 JK SW-P19 SW-P18 L-A4 SW-A18 2:B S-A1L-P4 SC-A2 TU SW-P17 SW-A19 ER-A16 SC-A3.3 KJ K J KJ K J ER-A8 SC-P7.1 S-P2 ER-A14 SW-A17 K J SW-A20 S-A6 21 *+ ER-P16 S-A2 SC-P7.3 KJ KJ S-A5SC-P7.4SC-P7.2 SW-P20.1 SC-P7.2 ER-A15.1 ER-A17 ER-A19 ER-A15.2 SC-A4.2 SC-A8.1 KJ KJ L-A5 ER-P17 SC-P8.1 KJ SW-P20.2 ER-A18 ER-P19 KK JJ 89 ER-A20 ER-A21.2 TU ER-A21.1 SW-P20.3 SW-P20.4 KJ S-A11 S-A9 S-A7.2 SC-A8.2 KJ SC-A4.1 S-A7.1 S-P5.1 SC-A7 ER-P20.3 K J S-A10ER-A24 KJ ER-A22 ER-A29 SC-A5 K J SC-P8.2 ER-A30 ER-P20.4 L-P5 ER-P20.6 K J S-A8 ER-P20.5 ER-P20.2SC-P8.3 S-A7.3 ER-A23 ER-P20.1 ER-A26ER-P24.2 SC-A8.3 S-P7.3 ER-A28ER-A27 ER-A25 S-P10 KJ SC-P7.5 GCI-A1 SC-A6 KJ K J U.S. Lock SCA-9 & Dam #2 SC-P9.1 Pool Lake y C g n 72 *+ ! Appendix B: Drainage Areas Appendix B - Drainage Areas Central DistrictEast Ravine District AreaAreaAreaArea Designation(acres)Designation(acres) C-A1238ER-A1526 C-A271ER-A2596 C-A342ER-A3606 C-A4112ER-A4475 C-A544ER-A5.117 C-A6230ER-A5.29 C-A7315ER-A5.313 C-A862ER-A5.41784 1114ER-A617 Total Area ER-A7304 ER-A8135 East Draw District ER-A985 AreaArea ER-A1016 Designation(acres) 39ER-A1152 ED-A1 119ER-A12217 ED-A2.1 41ER-A1348 ED-A2.2 11ER-A14111 ED-A3.1 56ER-A15.124 ED-A3.2 80ER-A15.249 ED-A4.1 46ER-A1667 ED-A4.2 155ER-A1764 ED-A5 105ER-A1836 ED-A6 78ER-A1970 ED-A7 121ER-A2059 ED-A8 19ER-A21.120 ED-A9.1 12ER-A21.250 ED-A9.2 3ER-A2227 ED-A9.3 4ER-A238 ED-A9.4 185ER-A2477 ED-A10 1074ER-A2514 Total Area ER-A265 ER-A274 Gables Lake District ER-A2813 AreaArea ER-A2921 Designation(acres) GL-A11469ER-A3013 Total Area1469Total Area5633 Appendix B - Drainage Areas Grey Cloud Island DistrictSt. Paul Park District AreaAreaAreaArea Designation(acres)Designation(acres) GCI-A11271SPP-A122 SPP-A234 Total Area1271 SPP-A331 16 Langdon District SPP-A3.1 SPP-A4.116 AreaArea SPP-A4.28 Designation(acres) L-A137SPP-A574 L-A2138SPP-A651 L-A3597SPP-A746 L-A4289SPP-A8172 L-A5206SPP-A9.159 SPP-A9.254 Total Area1267 SPP-A1054 Lower Saint Croix District Total Area637 AreaArea Southwest District Designation(acres) LSC-A1527AreaArea LSC-A2344Designation(acres) SW-A176 LSC-A3252 SW-A292 LSC-A4225 SW-A336 Total Area1347 SW-A495 SW-A575 South District SW-A641 AreaArea SW-A745 Designation(acres) S-A142SW-A864 S-A2209SW-A933 S-A3193SW-A1026 S-A4140SW-A11106 S-A5259SW-A1239 S-A6278SW-A1311 S-A7.135SW-A1448 S-A7.270SW-A1535 S-A7.322SW-A1623 S-A88SW-A1753 S-A987SW-A1816 S-A10202SW-A1911 S-A1180SW-A20184 Total Area1624Total Area1108 Appendix B - Drainage Areas Seeger Creek DistrictWest Draw District AreaAreaAreaArea Designation(acres)Designation(acres) SC-A1687WD-A119 SC-A2538WD-A262 SC-A31294WD-A372 SC-A4174WD-A4.128 SC-A583WD-A4.228 SC-A631WD-A4.325 SC-A7566WD-A4.49 SC-A8162WD-A4.52 SC-A9293WD-A4.611 WD-A4.735 Total Area3828 WD-A518 WD-A628 WD-A767 WD-A832 WD-A9.120 WD-A9.213 Thompson Grove District WD-A9.312 AreaArea WD-A9.43 Designation(acres) TG-A1.125WD-A9.532 TG-A1.222WD-A10.125 TG-A1.32WD-A10.223 TG-A1.425WD-A10.314 TG-A243WD-A10.4100 TG-A377WD-A11.18 TG-A41450WD-A11.23 TG-A5.198WD-A11.321 TG-A5.229WD-A1248 TG-A6118WD-A13.114 TG-A719WD-A13.210 TG-A822WD-A13.37 TG-A922WD-A13.416 TG-A1018WD-A13.57 TG-A1110WD-A13.638 TG-A12131WD-A13.75 TG-A13.14WD-A14.143 TG-A13.25WD-A14.23 TG-A13.35WD-A15.123 TG-A14144WD-A15.216 TG-A156WD-A15.312 TG-A1616WD-A15.414 TG-A1741WD-A15.5149 TG-A188WD-A15.674 TG-A1917WD-A15.774 TG-A2023WD-A1644 WD-A1749 Total Area2381 WD-A18.126 WD-A18.24 WD-A18.312 WD-A19.124 WD-A19.211 WD-A19.337 Total Area1467 ! Appendix C: Proposed Trunk Storm Sewer Data Appendix C - Proposed Trunk Storm Sewer Data Ponded DesignConveyance FromTo Flow Pipe SizeLength (cfs)(in.)(ft.) East Ravine District ER-P1ER-P253.0361241 ER-P4.1ER-P54.712" FM2100 ER-P8ER-P19750.010'X6' Box100 ER-P10ER-P122.012150 ER-P11ER-P127.0183640 ER-P12ER-P1442.527150 ER-P13ER-P143.812950 ER-P15.1ER-P15.2.42.212300 ER-P15.2.4ER-P1964.030110 ER-P17ER-P1815.121740 ER-P18ER-P1916.718750 ER-P19ER-P24808.52-66125 ER-P21.1ER-P21.26.112310 Gables Lake District GL-P1ER-P410.015" FM3500 Langdon District L-P4L-N5.1392.210'x5' Box100 St. Paul Park District SPP-P9.2TG-P410.024" FM3000 Seeger Creek District SC-P1.3SC-N2.1147.42-3660 SC-P2SC-N7.1242.14'x6' Box60 SC-P8.2SC-N9.1141.618575 South District S-P3S-P417.2271910 S-P4S-P536.8362510 S-P5S-P7.364.0362980 S-P6S-P7.331.924110 S-P7.1S-P7.35.212180 S-P7.2S-P7.38.612330 S-P7.3River100.62-24150 S-P9S-P108.615250 Southwest District SW-P1SW-P27.012660 SW-P2SW-P314.521690 SW-P3SW-P621.724370 SW-P6SW-P852.4362610 SW-P7SW-P83.6121300 SW-P8SW-P964.836580 SW-P9SW-N10.160.3361620 SW-P10SW-N10.13.18160 SW-N10.1River63.436950 SW-P14SW-N16.14.512120 SW-P15SW-N16.11.7151130 Thompson Grove District TG-P1.1TG-P1.36.218510 TG-P19TG-P20363.46'x6' Box140 TG-P20L-P3363.78'x5' Box90 West Draw District WD-P1WD-P21.412380 WD-P2WD-P32.512880 WD-P5WD-P65.112365 WD-P7WD-P821.918950 ! Appendix D: Pond Data (ATLAS14) SWMP (TP-40);2018 2008SWMP (ATLAS14) SWMP (TP-40);2018 2008SWMP (ATLAS14) SWMP (TP-40);2018 2008SWMP (ATLAS14) SWMP (TP-40);2018 2008SWMP (ATLAS14) SWMP (TP-40);2018 2008SWMP (ATLAS14) SWMP (TP-40);2018 2008SWMP (ATLAS14) SWMP (TP-40);2018 2008SWMP (ATLAS14) SWMP (TP-40);2018 2008SWMP ! Appendix E: Cost Estimates for Proposed Trunk System ! Appendix F: Rules and Regulations of the South Washington Watershed District ! Appendix G: System Improvements for Water Quality