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• Drainage Report NAC Architecture Coughlin Porter Lundeen Project No. C160030-01 June 4, 2018 TABLE OF CONTENTS I. PROJECT DESCRIPTION...........................................................................................................................1 11. SITE ASSESSMENT....................................................................................................................................2 TOPOGRAPHY................................................................................................................................................2 DRAINAGE.......................................................................................................................................................2 SOILS................................................................................................................................................................2 GROUNDCOVER............................................................................................................................................2 CRITICALAREAS............................................................................................................................................3 ADJACENTAREAS.........................................................................................................................................3 111. SITE DEVELOPMENT PLAN WITH ON -SITE STORMWATER MANAGEMENT......................................4 PROJECT THRESHOLDS...............................................................................................................................4 MINIMUM REQUIREMENTS...........................................................................................................................5 IV. CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN.....................................................7 CONSTRUCTION STORMWATER GENERAL PERMIT...............................................................................7 LAND DISTURBING ACTIVITY.......................................................................................................................7 • V. SOURCE CONTROL PLAN.........................................................................................................................8 VI. SPECIAL REPORTS AND/OR STUDIES....................................................................................................9 VII. OTHER PERMITS......................................................................................................................................10 VIII. PERMANENT STORMWATER CONTROL PLAN....................................................................................11 OFF -SITE ANALYSIS....................................................................................................................................11 PRE -DEVELOPED HYDROLOGY................................................................................................................11 DEVELOPED HYDROLOGY.........................................................................................................................11 STORMWATER TREATMENT PLAN...........................................................................................................11 STORMWATER FLOW CONTROL PLAN....................................................................................................12 MAINTENANCE AND OPERATION PLAN...................................................................................................12 FIGURES............................................................................................................................................................13 FIGURE 1 —VICINITY MAP...........................................................................................................................13 FIGURE 2A — EXISTING CONDITIONS: MAIN SITE...................................................................................13 FIGURE 2B — EXISTING CONDITIONS: FIELD...........................................................................................13 FIGURE 3A— PROPOSED CONDITIONS: MAIN SITE...............................................................................13 FIGURE 3B — PROPOSED CONDITIONS: FIELD.......................................................................................13 FIGURE 3C — PROPOSED CONDITIONS: FIELD ALTERNATE................................................................13 FIGURE 4A — EXISTING CONDITIONS: RIGHT-OF-WAY..........................................................................13 FIGURE 4B — PROPOSED CONDITIONS: RIGHT-OF-WAY......................................................................13 APPENDICES.....................................................................................................................................................14 • APPENDIX A — INTERIM POLICY................................................................................................................14 APPENDIX B — CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN ...........................14 COUGHLINPORTERLUNDEEN ,i. 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