BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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groundwater, depths to restrictive layers, and any other potentialimpediments to successful infiltration.• The bottom of an infiltration basin shall not be closer than 1 foot to highseasonal groundwater indicators.• Where space is available, size the basin to retain at least the 20-yr/1-hrvolume generated from the tributary impervious area.• Above ground infiltration basins shall be designed to infiltrate stormwaterwithin 96 hours.• An underdrain system may be used to increase infiltration through aboveground systems during winter periods when soils are more likely to freeze.A minimum 8-inch diameter underdrain pipe, encased in gravel, can be usedto drain the soils below infiltration basins. A valve attached to theunderdrain system can be used to control the rate of draw down in thebasin. The valve can either be actively managed, or left open during thewinter season to allow snowmelt to quickly move through the soils in thebasin and reduce the potential for frozen soils to occur.• In areas where salt-based deicers are directed to infiltration basins, soil maybecome less fertile and less capable of supporting vegetation. Incorporatingorganic amendments such as dry wood chips or composted material can helpto mitigate this potential problem.• Snow storage within Infiltration Basins may be acceptable if the followingconditions are met:• Drainage design standards for the responsible jurisdiction allow thepractice.• The limits of snow storage within the basin are clearly designated and donot encroach on the inlet and outlet structures of the basin.• Basin capacity has been increased to accommodate expected snow storageamounts in addition to the design storm (typically the 20-yr/1-hr storm).The basin must retain the capacity to hold the design storm at all timesduring snow storage operations.• Stabilized access for snow plowing equipment is provided.• Maintenance is conducted annually after spring snowmelt to removematerial and debris from the basin, rehabilitate the infiltration capacity ofthe basin, and to confirm conveyance facilities are functional.TRPA BMP HandbookCHAPTER 4: BMP Toolkit2012 4.1.1.2-Infiltration BasinPage 3
An infiltration basin functioning during a summer storm event.INSTALLATION CONSIDERATIONS• Remove and stockpile any native topsoil for use after rough grading basindimensions.• After completing basin grading activities, till back in topsoil or other soilamendments to improve infiltration capacity, which may be diminished bycompaction from heavy equipment during grading. Tilling activities aretypically at least 12 inches deep.• The basin bottom shall be graded flat to provide uniform ponding andinfiltration across the surface area of the basin.INSPECTION AND MAINTENANCEThe following inspection and maintenance protocols were developed generallyfollowing those outlined in the BMP Rapid Assessment Methodology (RAM)for the Lake Tahoe Region. RAM protocols include setting and monitoringbenchmark and threshold standard values for infiltration, materialaccumulation, and vegetation establishment within an infiltration basin.EFFECTIVENESS CONSIDERATIONSAn appropriately sized infiltration basin that is adequately maintained isassumed to be one of the most effective BMPs described in this Handbook forremoval of pollutants of concern while achieving runoff reductions fromdevelopment. However, continued effectiveness may require frequentmaintenance, especially if infiltrated stormwater contains significant sedimentloads. Infiltration basins are relatively easy to construct when adequate land isavailable, and are typically less maintenance intensive than BMPs relying onfiltration of stormwater for pollutant load reductions.CHAPTER 4: BMP ToolkitTRPA BMP Handbook4.1.1.2-Infiltration Basin 2012Page 4
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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
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1.3.3.4 LOAD REDUCTION PLANNING TOO
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in HMS may be event-based or contin
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1.3.3.6 POLLUTANT LOAD REDUCTION MO
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AVAILABILITY AND SUPPORTING DOCUMEN
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TYPICAL LEVEL OF EFFORTHSPF and LSP
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few days to a week of time to revie
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USACE studies recommended use of th
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during the initial site visit, or c
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Figure 2-a: Soil Horizons• Depth
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Evidence of compacted and disturbed
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UNMAPPED ROCK OUTCROPS, STEEP SLOPE
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The primary pollutants of concern o
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On the map use an arrow to delineat
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2.2.3 ADDITIONAL DATA GATHERINGAfte
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and allowable uses. Baseline Land C
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topographic survey will be required
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Table 2-3: Basis of Capability Clas
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Keep your property lean, clean,and
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treatment. This will reduce the mai
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ponds, wetlands, lakes, manmade cha
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2.3.3.2 SOILS HYDROLOGIC REPORTThe
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Page 102 and 103: STORMWATER TREATMENTRepresents BMPs
Page 104 and 105: Table 3-1: Waste Management and Mat
Page 106 and 107: D. STABILIZE STEEP DISTURBED SLOPES
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
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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 152 and 153: Very few performance monitoring stu
Page 154 and 155: INSPECTION AND MAINTENANCE ACTIVITI
Page 156 and 157: 4.1.1.3 INFILTRATION TRENCHAlternat
Page 158 and 159: • Consult the NRCS Tahoe Basin So
Page 160 and 161: • Alternative Method: Excavate th
Page 162 and 163: Figure 4.1-c: Infiltration TrenchTR
Page 164 and 165: Figure 4.1-e: Roof Dripline Planter
Page 166 and 167: 4.1.1.4 SUBSURFACE INFILTRATION SYS
Page 168: percent void space compared to 40 p
Page 171 and 172: • Ensure the surrounding surface
Page 174 and 175: 4.1.1.5 RAIN BARREL AND CISTERNAlte
Page 176 and 177: • Position the rain barrel or cis
Page 178 and 179: 4.1.1.6 RAIN GARDENAlternative Name
Page 180 and 181: • To manage high flows, design a
Page 182 and 183: 4.1.1.7 FILTER STRIPAlternative Nam
Page 184 and 185: • The top of the vegetated filter
Page 186 and 187: INSPECTION AND MAINTENANCE ACTIVITI
Page 188 and 189: Figure 4.1-i: Vegetated Filter Stri
Page 190 and 191: LIST OF FIGURESFigure 4.2-a: Slope
Page 192 and 193: Chapter 4: BMP ToolkitTRPA BMP Hand
Page 194 and 195: • Obtain and use a road abrasive
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Page 198 and 199: • 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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Chapter 4: BMP ToolkitTRPA BMP Hand
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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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