Department of the Environment Stormwater Best Management Practices Inspection Manual
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Prince George’s County Government Department of Environmental Resources Stormwater Best Management Practices Inspection Manual July 2009 PRINCE GEORGE’S COUNTY DEPARTMENT OF ENVIRONMENTAL RESOURCES – NPDES PROGRAM Tables of Contents 1. INTRODUCTION............................................................................................................................ 1 2. PREPARATION .............................................................................................................................. 1 2.1 PRE-FIELD INVESTIGATION ............................................................................................................. 1 2.2 FIELD INSPECTION TEAMS............................................................................................................... 1 3. FIELD OPERATIONS.................................................................................................................... 2 3.1 FIELD EQUIPMENT .......................................................................................................................... 2 3.2 LOG BOOK ...................................................................................................................................... 2 3.3 SAFETY AND SECURITY................................................................................................................... 3 3.4 INSPECTION FORMS......................................................................................................................... 3 3.4.1 BMP Inspection Form............................................................................................................... 5 3.5 BMP DATA COLLECTION................................................................................................................ 7 3.5.1 BMP Ownership........................................................................................................................ 7 3.5.2 BMP Inspection Report............................................................................................................. 9 3.5.3 BMP Fact Sheets..................................................................................................................... 10 Dry Swale..................................................................................................................................... 11 Bio-Retention............................................................................................................................... 13 Filter Strip .................................................................................................................................... 16 Landscape – Rain Garden ............................................................................................................ 18 Sand Filter.................................................................................................................................... 20 Grass Swale.................................................................................................................................. 23 Vegetated Buffer.......................................................................................................................... 25 Porous Pavement.......................................................................................................................... 27 Bay SaversTM ............................................................................................................................... 29 Oil-Grit Separator ........................................................................................................................ 31 StormceptorTM.............................................................................................................................. 33 Underground Storage................................................................................................................... 35 Dry Well....................................................................................................................................... 37 Infiltration Basin .......................................................................................................................... 39 Infiltration Trench........................................................................................................................ 42 i PRINCE GEORGE’S COUNTY DEPARTMENT OF ENVIRONMENTAL RESOURCES – NPDES PROGRAM Dry Pond ...................................................................................................................................... 45 Extended Detention Structure Dry............................................................................................... 48 Extended Detention Structure Wet .............................................................................................. 50 Wet Pond...................................................................................................................................... 53 Artificial Wetland ........................................................................................................................ 55 Shallow Marsh ............................................................................................................................. 57 Check Dam................................................................................................................................... 59 Gabion.......................................................................................................................................... 61 Level Spreader ............................................................................................................................. 62 Flow Splitter................................................................................................................................. 64 3.6 BMP PHOTOGRAPHS NAMING ...................................................................................................... 66 4. REFERENCES............................................................................................................................... 67 APPENDIX A INSPECTION RATING CRITERIA AND INSPECTION RATING FORM APPENDIX B EXAMPLES OF FIELD MAPS APPENDIX C PICTURES OF STANDARD BMP FEATURES ii PRINCE GEORGE’S COUNTY DEPARTMENT OF ENVIRONMENTAL RESOURCES – NPDES PROGRAM List of Tables Table 1 Category and Sub-categories of Best Management Practices (BMP) ......................................... 10 Table 2 Standard Photograph Naming Convention .................................................................................. 66 List of Figures Figure 1 BMP Inspection Work Flow......................................................................................................... 8 Figure 2 Dry Swale ................................................................................................................................... 11 Figure 3 Schematic of Dry Swale Components........................................................................................ 12 Figure 4 Bioretention ................................................................................................................................ 13 Figure 5 Schematic of Bioretention .......................................................................................................... 15 Figure 6 Filter Strip................................................................................................................................... 16 Figure 7 Schematic of Filter Strip Components ....................................................................................... 17 Figure 8 Rain Garden................................................................................................................................ 18 Figure 9 Schematic of Rain Garden.......................................................................................................... 19 Figure 10 Sand Filters............................................................................................................................... 20 Figure 11Schematic of Sand Filter Components ...................................................................................... 22 Figure 12 Grass Swale .............................................................................................................................. 23 Figure 13 Schematic of Grass Swale Components................................................................................... 24 Figure 14 Vegetated Buffer ...................................................................................................................... 25 Figure 15 Schematic of Vegetated Buffer ................................................................................................ 26 Figure 17 Schematic of Porous Pavement Components........................................................................... 28 Figure 18 Bay Savers................................................................................................................................ 29 Figure 19 Schematic of Bay Saver Components ...................................................................................... 30 Figure 20 Oil-Grit Separators ................................................................................................................... 31 Figure 21 Schematic of Oil-Grit Separator Components.......................................................................... 32 Figure 22 Stormceptor .............................................................................................................................