BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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D. STABILIZE STEEP DISTURBED SLOPESA naturally steep slope that is already stable and not slated for legally permittedconstruction shall be left undisturbed. Always maintain the overall naturaltopography of a site to the greatest extent possible. Slopes created from cut andfill during legally permitted construction may need structural solutions such asriprap, terracing, or retaining walls. Use native and adapted plants to increasesoil stability and visually break up structural elements with soft pockets ofvegetation. Where vegetation is unlikely to establish, riprap without additionalvegetation may be appropriate.Table 3-2: Soil StabilizationHANDBOOKSECTIONSediment Source Control BMPs(Section 4.2.2 Slope Stabilization andSection 4.2.3 Soil Stabilization)APPLICABLE BMPSSoil and Vegetation Restoration(Chapter 5)Pervious Pavement(Section 4.1.1.1)Slope Stabilization(Section 4.2.2)Paving Parking Areas and Roads(Section 4.2.3.1)Bare Soil Protection(Section 4.2.3.2)Deck Armor(Section 4.2.3.3)Snow Storage(Section 4.2.1.3)Parking and Vehicle Barriers(Section 4.2.3.4)Disturbed andCompactedSoilsxxxCOMMON WATER QUALITY PROBLEMSUnpavedDrivewaysand ParkingAreasxxSoil Erosionon SlopesxSnowplowsDisturbingSoilxRunoffthroughDecksx3.4.3 HYDROLOGIC SOURCE CONTROLThe Design Storm used for infiltration BMPs on small residential sites is the 20-yr/1-hr storm, approximately 1”/hr. Using the Natural ResourceConservation Service (NRCS) calculation spreadsheet is usually adequate fordesigning this storage capacity. Chapter 1, Urban Hydrology further discussesthe BMP Calculation Spreadsheet, and the most recent version of thespreadsheet with supporting materials can be downloaded at:http://www.tahoebmp.org/. See Table 3-3 for appropriate infiltrationtechniques that provide hydrologic source control for stormwater runoff fromdriveways, parking lots, and rooftops.TRPA BMP HandbookCHAPTER 3: Permanent BMP Planning and Selection2012 Page 3-7
Table 3-3: Hydrologic Source ControlHANDBOOKSECTIONAPPLICABLE BMPSRunoff fromStructures andHomesCOMMON WATER QUALITY PROBLEMS TO ADDRESSRunoff from PavedDriveways andParkingInfiltration Trench(Section 4.1.1.3) x xNotes and UsesTypically used for runoff sheet flowing fromrooftops or driveways.Hydrologic Source Control BMPs(Section 4.1 Hydrologic Source Control)Rain Garden(Section 4.1.1.6) x xFilter Strip(Section 4.1.1.7)xRock Lined andVegetated Swale(Section 4.3.1.10)x xSubsurfaceInfiltration System(Section 4.1.1.4)x xPervious Pavement(Section 4.1.1.1)xLandscaped depression that typically includesintensive planting and permanent irrigation.Can induce/increase soil infiltration function.Also useful along turf perimeter and for SEZbuffers.In order to incorporate infiltration capacity,use of check dams is necessary. Refer also toCheck Dam (Section 4.1.1.9)Useful to "hide" infiltration systems belowground. May provide increased runoffstorage capacity where space for infiltrationis limited.A rigorous maintenance regime is necessaryto maintain effectiveness over time.Redundant BMPs may be required by thepermitting authority.This rain garden collects driveway stormwater via a rock swale constructed through a grassarea. An above ground low-flow irrigation system supports aesthetically pleasing nativeand adapted plants.CHAPTER 3: Permanent BMP Planning and SelectionTRPA BMP HandbookPage 3-8 2012
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PREFACEThe Tahoe Regional Planning
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TABLE OF CONTENTSPREFACE...........
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3.5.5 Stormwater Treatment ........
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6.3 Projects 1 to 5 Acres and all C
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8.10.5 Maintenance ................
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Table 8-4: Federal, State and Regio
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Figure 4.3-i: Vegetated Swale .....
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INTRODUCTIONPURPOSE AND USERS OF TH
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Lake Tahoe’s world renowned blue
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Urbanization in the Lake Tahoe wate
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50 percent of the light scattering
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Figure I-c: Impervious Cover versus
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Disconnected impervious areasdrain
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POLLUTANT EFFECT URBAN SOURCES ASSO
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BEST MANAGEMENT PRACTICESHistorical
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Table I-2: Differences in BMP Retro
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CHAPTER 1: URBAN HYDROLOGY1.1 PURPO
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Figure 1-a: Runoff ProcessesTRPA BM
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Although many urbanized areas face
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watersheds to make the necessary es
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Pollutant load estimates are typica
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differ from the following recommend
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Figure 1-b: Hydrologic Processes an
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1.3.3.2 NRCS BMP CALCULATION SPREAD
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1.3.3.3 RATIONAL METHODMODEL SUMMAR
Page 56 and 57: 1.3.3.4 LOAD REDUCTION PLANNING TOO
Page 58 and 59: in HMS may be event-based or contin
Page 60 and 61: 1.3.3.6 POLLUTANT LOAD REDUCTION MO
Page 62 and 63: AVAILABILITY AND SUPPORTING DOCUMEN
Page 64 and 65: TYPICAL LEVEL OF EFFORTHSPF and LSP
Page 66 and 67: few days to a week of time to revie
Page 68 and 69: USACE studies recommended use of th
Page 70 and 71: during the initial site visit, or c
Page 72 and 73: Figure 2-a: Soil Horizons• Depth
Page 74 and 75: Evidence of compacted and disturbed
Page 76 and 77: UNMAPPED ROCK OUTCROPS, STEEP SLOPE
Page 78 and 79: The primary pollutants of concern o
Page 80 and 81: On the map use an arrow to delineat
Page 82 and 83: 2.2.3 ADDITIONAL DATA GATHERINGAfte
Page 84 and 85: and allowable uses. Baseline Land C
Page 86: topographic survey will be required
Page 89: Table 2-3: Basis of Capability Clas
Page 92 and 93: Keep your property lean, clean,and
Page 94 and 95: treatment. This will reduce the mai
Page 96 and 97: ponds, wetlands, lakes, manmade cha
Page 98 and 99: 2.3.3.2 SOILS HYDROLOGIC REPORTThe
Page 100 and 101: CHAPTER 3: PERMANENT BMP PLANNINGAN
Page 102 and 103: STORMWATER TREATMENTRepresents BMPs
Page 104 and 105: Table 3-1: Waste Management and Mat
Page 108 and 109: This infiltration trench collects s
Page 110 and 111: 3.5 PROJECTS 1 TO 5 ACRES AND ALL C
Page 112 and 113: This Page Blank.TRPA BMP HandbookCH
Page 114 and 115: unnecessary turf areas and replace
Page 116 and 117: Table 3-5: Waste Management and Mat
Page 118 and 119: 3.5.2.3 SOIL STABILIZATIONA. RESTOR
Page 120 and 121: Left: Dripline erosion below a deck
Page 122 and 123: Pervious concrete parking pad locat
Page 124 and 125: 3.5.5 STORMWATER TREATMENT3.5.5.1 M
Page 126 and 127: 3.6.1.1 JURISDICTIONThese projects
Page 128 and 129: to perform required inspection and
Page 130 and 131: 3.8.2.4 SHARED ACCESS AND EASEMENTS
Page 132 and 133: 3.8.2.8 STREAM ENVIRONMENT ZONES (S
Page 134 and 135: Sediment versus erosion:Suspended s
Page 136 and 137: CONTENTSCHAPTER 4: BMP TOOLKIT ....
Page 138 and 139: CHAPTER 4: BMP TOOLKIT4.1 HYDROLOGI
Page 140 and 141: 4.1.1.1 PERVIOUS PAVEMENTAlternativ
Page 142 and 143: • Tree canopy overhead can decrea
Page 144 and 145: ate determined at the time of insta
Page 146 and 147: Figure 4.1-a: Pervious ConcreteTRPA
Page 148 and 149: 4.1.1.2 INFILTRATION BASINAlternati
Page 150 and 151: groundwater, depths to restrictive
Page 152 and 153: Very few performance monitoring stu
Page 154 and 155: INSPECTION AND MAINTENANCE ACTIVITI
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4.1.1.3 INFILTRATION TRENCHAlternat
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• Consult the NRCS Tahoe Basin So
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• Alternative Method: Excavate th
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Figure 4.1-c: Infiltration TrenchTR
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Figure 4.1-e: Roof Dripline Planter
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4.1.1.4 SUBSURFACE INFILTRATION SYS
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percent void space compared to 40 p
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• Ensure the surrounding surface
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4.1.1.5 RAIN BARREL AND CISTERNAlte
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• Position the rain barrel or cis
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4.1.1.6 RAIN GARDENAlternative Name
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• To manage high flows, design a
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4.1.1.7 FILTER STRIPAlternative Nam
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• The top of the vegetated filter
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INSPECTION AND MAINTENANCE ACTIVITI
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Figure 4.1-i: Vegetated Filter Stri
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LIST OF FIGURESFigure 4.2-a: Slope
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Chapter 4: BMP ToolkitTRPA BMP Hand
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• Obtain and use a road abrasive
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• Mechanical broom sweepers may a
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EFFECTIVENESS CONSIDERATIONSA signi
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for dry basins or infiltration basi
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• For unpaved snow storage areas
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Figure 4.2-a: Slope Stabilization A
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Disadvantages• Not always success
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• Bind together long live branch
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Brush Layering and MattingBrush lay
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Advantages• Reduces the erosion p
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Table 4.2-1: Terracing Inspection a
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Disadvantages• Can be complicated
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• Revegetate the backfilled bench
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Figure 4.2-d: Timber Retaining Wall
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Advantages• Versatile and applica
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Table 4.2-3: Riprap Inspection and
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educe the concentration of runoff,
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Figure 4.2-g: Slope Bottom BenchFig
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• Contour Furrows - relatively de
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APPLICABILITYAll roads, driveways,
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Stormwater runoff from a paved park
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Figure 4.2-k: Grading for Sheet Flo
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INORGANIC MULCH:• Areas where org
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• Stockpile and use existing orga
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The surface under the raised decksh
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Figure 4.2-l: Rock Armor - Elevated
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Clustered boulders used for parking
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• Helps to protect wildlife.• H
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EFFECTIVENESS CONSIDERATIONSA prope
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Improper storage of hazardous mater
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• Try to use the entire product b
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facilities must be equipped with ap
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• Dispose of it properly• Be a
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Disadvantages• Additional resourc
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• All hay, cubed hay, straw, mulc
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• Sanitary sewer regulations gene
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APPLICABILITYAll vehicles, includin
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• Do not perform other vehicle or
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LIST OF FIGURESFigure 4.3-a: Curb B
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APPLICABILITY• Culverts are appli
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deterioration. The inspection crew
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APPLICABILITY• Curb and gutters a
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INSTALLATION CONSIDERATIONS• Inst
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Figure 4.3-b: Rolled CurbChapter 4:
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Advantages• Prevents the discharg
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Table 4.3-2: Storm Drain Inspection
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Advantages• Prevents scour that m
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Figure 4.3-c: Outlet ProtectionChap
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• The structure can be designed t
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INSTALLATION CONSIDERATIONS• Disc
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Advantages• Assists in the contro
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Figure 4.3-e: Slotted Channel Drain
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Advantages• May be less expensive
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Table 4.3-5: A/C Swale Inspection a
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• Prevents property damage, slope
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Figure 4.3-g: Subsurface DrainChapt
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abrasives applied during the winter
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Table 4.3-7: Rock Lined and Vegetat
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Figure 4.3-i: Vegetated SwaleChapte
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Check dams installed in water sprea
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• Design check dams perpendicular
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CONTENTS4.4 Stormwater Treatment ..
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4.4 STORMWATER TREATMENTThe primary
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4.4.1.1 WET BASINAlternative Names:
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• Surcharge storage above the wet
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Table 4.4-1: Wet Basin Inspection a
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Figure 4.4-a: Wet Basin (Concept Dr
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4.4.1.2 BIOSWALEAlternative Names:
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• Consider incorporating trees or
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Figure 4.4-b: Bioswale (Linear Basi
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4.4.1.3 DRY BASINAlternative Names:
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• Drainage design standards for t
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INSPECTION AND MAINTENANCE ACTIVITI
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Figure 4.4-c: Detention BasinTRPA B
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4.4.2 FLOW THROUGH TREATMENTFlow-th
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4.4.2.1 DROP INLET INSERTAlternativ
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INSTALLATION CONSIDERATIONS• Refe
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4.4.2.2 TRASH RACKAlternate Names:
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4.4.2.3 BAFFLED VAULTAlternative Na
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• Ensure that site conditions all
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4.4.2.4 HYDRODYNAMIC SEPARATORAlter
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• Most units are designed to be c
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4.4.2.5 MEDIA FILTERAlternate Names
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Cartridge Filter• Cartridge filte
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• Vent the system as for undergro
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4.4.2.6 SEDIMENT TRAPAlternative Na
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INSPECTION AND MAINTENANCE• Regul
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Figure 4.4-e: Sediment TrapTRPA BMP
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CONTENTS4.5 Temporary BMPs for Cons
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4.5 TEMPORARY BMPS FOR CONSTRUCTION
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concrete washouts and stockpiles sh
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4.5.1.1 CONSTRUCTION PLANNING AND S
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• Measures to minimize the potent
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4.5.1.2 CONSTRUCTION BOUNDARY FENCI
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Figure 4.5-a: Construction Boundary
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4.5.1.3 DEWATERINGDESCRIPTIONDewate
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Figure 4.5-b: DewateringTRPA BMP Ha
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• Use this settled water to fill
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4.5.1.4 CLEAN WATER DIVERSIONAltern
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• Avoid disturbing aquatic specie
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• Pipe slope drain: A rigid pipe,
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Stream Isolation Techniques:• Tur
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Figure 4.5-f: Water DiversionTRPA B
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4.5.1.5 VEGETATION PROTECTIONAltern
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• Growing Space: Provide spacing
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Figure 4.5-g: Vegetation Protection
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4.5.1.6 TEMPORARY SANITATION FACILI
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4.5.1.7 DUST CONTROLAlternate Names
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• Blanket with geotextiles or veg
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4.5.1.8 VEHICLE INGRESS EGRESS MANA
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• If possible, re-use swept or va
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4.5.1.9 WINTERIZATIONDESCRIPTIONBet
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INSPECTION AND MAINTENANCEEnsure th
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4.5.1.10 CONSTRUCTION STAGINGAltern
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4.5.1.11 MATERIAL HANDLING STORAGE
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• Ensure that current Material Sa
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4.5.1.12 TOPSOIL SALVAGEAlternative
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• If topsoil will not be used for
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4.5.1.13 CONCRETE/BENTONITE MANAGEM
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Figure 4.5-i: Concrete Washout Stat
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4.5.1.14 STOCKPILE MANAGEMENTAltern
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Figure 4.5-j: Stockpile ManagementT
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4.5.2 EROSION AND SEDIMENT CONTROLR
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4.5.2.1 SWEEPINGDESCRIPTIONDuring c
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4.5.2.2 DRAIN INLET PROTECTIONAlter
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inches. Take care to ensure that no
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Figure 4.5-k: Drain Inlet Protectio
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4.5.2.3 FIBER ROLLAlternative Names
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• Adjust spacing of fiber rolls a
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Figure 4.5-l: Fiber RollsTRPA BMP H
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4.5.2.4 SILT FENCEAlternative Names
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• Turn the fabric uphill at the e
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Figure 4.5-m: Silt FenceTRPA BMP Ha
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4.5.2.5 EROSION CONTROL BLANKET SYS
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structures mark the boundaries of t
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Figure 4.5-p: Anchoring Geotextiles
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4.5.2.6 HYDROMULCH, TACKIFIER, AND
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INSPECTION AND MAINTENANCE• Hydro
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5.2 SOILSoil is a complex living sy
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Tilling green wood chips intothe so
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areas such as SEZs and in shorezone
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Large boulders provide permanent ve
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To address this TRPA’s Regional P
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to apply ½ inch of water. Water yo
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Pesticides can be degraded by sunli
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5.3.2.5 FIRE DEFENSIBLE SPACEFire d
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etween them. For example, shrubs wi
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5.4 PROJECT SCALE REQUIREMENTSSoil
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5.4.1.5 PROJECT INSTALLATIONA. CONT
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percent vegetative cover, soil surf
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TRPA Revegetation Plan TemplateSoil
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(c) GRADING AND SLOPE SHAPINGDescri
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TRPA Revegetation Plan ExampleSoil
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• All machinery must be clean bef
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Common NameScientific NameScotchbro
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during dry weather. All debris, roo
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substantially different that the pe
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TRPA BMP HandbookCHAPTER 5: Soil an
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Fertilizer Management PlanProject N
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IV. MONITORINGSurface and groundwat
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I. PROJECT AND SITE DESCRIPTIONGold
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Table 5-1: Description of Revegetat
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SITE TYPE RECOMMENDED SPECIES LISTS
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SITE TYPE RECOMMENDED SPECIES LISTW
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CHAPTER 5: Soil and Vegetation Mana
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TRPA APPROVED PLANT SPECIES ATTRIBU
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TRPA APPROVED PLANT SPECIES ATTRIBU
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CHAPTER 5: Soil and Vegetation Mana
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• Section 6.2 describes methods f
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equirements. At a minimum, training
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Vactor equipment removes sediment a
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Industrial Properties, Marinas, and
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• Rinse the rock with hose water
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EXAMPLE INSPECTION AND MAINTENANCE
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MONITORING PLAN TEMPLATE1. TITLE PA
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MONITORING, INSPECTION, ANDMAINTENA
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Sample Site123 Main StreetSouth Lak
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3. MONITORINGIn 2011, South Lake Ta
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ATTACHMENT BWATER QUALITY DATA
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ATTACHMENT DINSPECTION AND MAINTENC
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• Discharge of stormwater from in
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PAVING SINGLE FAMILY RESIDENTIAL PR
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TRPA Shorezone permit (www.trpa.org
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CHAPTER 8: SHOREZONE PROTECTIVESTRU
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technical guidance on structural an
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Pope has developed a shorezone miti
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ADVANTAGES• Protect parcel develo
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Table 8-3: Categorical Classificati
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generate observable changes in the
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Table 8-5: The General Geomorphic C
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8.1.8.2 TOLERANCE DISTRICT AND BACK
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Figure 8-e: Option 2—Backshore De
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Scenic Resources and project compli
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8.2 BULKHEADS AND LAKE WALLS8.2.1 O
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oth the beach immediately fronting
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Like all BMPs, bulkheads and lake w
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For a bulkhead located such that th
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Figure 8-i: Typical Lake Wall (Grav
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Table 8-9: Advantages and Disadvant
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maintains its position under wave s
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8.3.4 INSTALLATIONAs with bulkheads
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Table 8-11: Advantages and Disadvan
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V t ≥ 5R c2(Equation 4.1)Where:Vt
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8.5 BEACH NOURISHMENT AND REPLENISH
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of not being able to protect the ba
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• The material must be washed to
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nourishment will be determined by m
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8.7 BREAKWATERS8.7.1 OVERVIEWBreakw
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The procedure for determining armor
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8.8 SHOREZONE VEGETATION8.8.1 OVERV
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vegetation. Protecting a tree from
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Overall, dredging can be either a p
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The Pneuma pump is a piece of dredg
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nature of the project and the poten
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8.10 TURBIDITY CURTAINS8.10.1 OVERV
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weights or connected firmly to sand
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Figure 8-o: Turbidity Curtain Desig
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Aquatic invasive species (AIS) also
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tanks into a sewage retention and/o
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• A common problem with recreatio
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8.12 BOAT RAMP CONSTRUCTION AND VEH
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amp at the change of grade. A V-gro
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Figure 8-p: Boat Ramp DesignTRPA BM
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Table 8-22: Overview of Geotechnica
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8.14 SHOREZONE PROTECTIVE STRUCTURE
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8.14.2 ADDITIONAL CONSIDERATIONS FO
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some designated boundary or sphere
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spawning grounds and juvenile nurse
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Marine Science, School of Geoscienc
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Osborne, R.H., et. Al. (1985). Sedi
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8.16 APPENDICES8.16.1 DESIGN CALCUL
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Figure 8-r defines the primary wave
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8.16.1.2 WAVE RUN-UP FORMULA FOR BA
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• Use Equation 16.10 to calculate
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Figure 8-u: Design Wave CasesTRPA B
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Figure 8-v: Wave Setup and Run-Up f
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Alternative methods of wave calcula
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GLOSSARYAccretionMay be either a na
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eaches have no berm, others have se
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DensityMass (in kg) per unit of vol
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Fire Defensible SpaceRefers to the
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Common terms related to land covera
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PermeabilityThe property of a bulk
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ScourRemoval of underwater material
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SlopeThe degree of inclination to t
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Technical Advisory Committee (TAC)C
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ACRONYMSACES - Automated Coastal En
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NPS - Nonpoint SourceNRCS - Natural
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BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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