BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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4.5.1.13 CONCRETE/BENTONITE MANAGEMENTAlternative Names: Masonry Materials and Bentonite Waste Management;Concrete/Mortar WashoutDESCRIPTIONConcrete work generates water and slurry containing fine particles, high levelsof chromium, and a high pH; all of which can cause violation of water qualitystandards for receiving waters. This practice is intended to prevent thedischarge of concrete/bentonite. Practices include off-site truck and equipmentwashouts, performing on-site washouts in designated areas, containing anddisposing of wastes properly, and appropriately training constructionpersonnel.SITE SUITABILITYWhere concrete, mortar, grout, cement, or any other potentially pH-alteringmaterials are mixed and/or used on-site during construction.Advantages• Minimizes concrete/bentonite pollutants from entering surface andgroundwater.• Prevents improper disposal of unused concrete/bentonite that canaccumulate and solidify in storm conveyance systems and severely reducetheir capacities.BMP DESIGN APPROACHPollutant SourceControlHydrologic SourceControlStormwater TreatmentSCALE OF APPLICATIONAll SFR and MFR < 1acreMFR 1-5 Acre andCICU < 5 acresMFR and CICU > 5acres and all WQIPsTYPE OF APPLICATIONTemporaryPermanentDisadvantages• Requirements for off-site washout may increase difficulty of maintainingdelivery vehicles in operating condition and increase construction costs.DESIGN CONSIDERATIONS• Size washout facilities to completely contain all slurry waste generated.• Ensure that a spill kit is available at each station, capable of rapid use in caseof spills.• Incorporate requirements for concrete/bentonite waste management intoagreements with material suppliers and in specifications for contractors.• Washing of vehicles or construction equipment, including cement mixers,must be authorized by the permitting authority.• Locate wash stations away from construction traffic routes to reduce thelikelihood of accidental damage and spills.• Locate washout facilities a minimum of 50 feet from storm drains, openditches, and water bodies.• Clean concrete paving and hauling vehicles regularly at approved off-sitelocations. Use dry methods of removing hardened concrete (such asTRPA BMP HandbookChapter 4: BMP Toolkit2012 4.5.1.13-Concrete/Bentonite ManagementPage 1
scrubbing with a brush by hand) instead of water or solvents wheneverpossible.• Do not wash out concrete trucks or equipment into storm drains, openditches, streets, or streams.• Instruct drivers, equipment operators, concrete suppliers, and theiremployees about proper practices for waste disposal and equipmentwashout. Discuss concrete management techniques, such as handling ofconcrete waste and washout, before any deliveries are made.INSTALLATION• Monitor weather conditions and wind direction to ensure that concrete dustwill not enter storm drains, watercourses, surface waters, or the atmosphere.Conduct concrete operations during dry weather and monitor weatherforecasts throughout the workday. Sweep and vacuum as necessary to collectand control concrete dust.• Avoid mixing excess amounts of fresh concrete or cement on-site. Do notallow excess concrete to be poured, preventing generation of waste material.• Ensure that on-site washout stations are water-tight.• Size washout stations to handle expected volumes of solids, wash water, andrainfall.• Post information about proper techniques for washout and waste disposal ateach station, plainly visible to construction personnel.• Clean all hand tools at washout stations.• Properly dispose of any sweepings or aggregate base after activities haveceased.INSPECTION AND MAINTENANCE• Inspect and verify that spill containment barriers are in place prior tocommencement of construction activity.• Inspect and verify the concrete washout facilities do not leak and are in goodworking order prior to commencement of concrete work.• Maintain designed holding capacity of concrete washout facilities.• For below-ground wash stations, backfill any holes or depressions andstabilize all disturbed soils.• If soil is contaminated with concrete or bentonite, contain and remove thecontaminated soil and appropriately dispose of it at a TRPA approveddisposal site.Chapter 4: BMP ToolkitTRPA BMP Handbook4.5.1.13-Concrete/Bentonite Management 2012Page 2
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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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CHAPTER 3: PERMANENT BMP PLANNINGAN
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STORMWATER TREATMENTRepresents BMPs
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Table 3-1: Waste Management and Mat
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D. STABILIZE STEEP DISTURBED SLOPES
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This infiltration trench collects s
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3.5 PROJECTS 1 TO 5 ACRES AND ALL C
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This Page Blank.TRPA BMP HandbookCH
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unnecessary turf areas and replace
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Table 3-5: Waste Management and Mat
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3.5.2.3 SOIL STABILIZATIONA. RESTOR
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Left: Dripline erosion below a deck
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Pervious concrete parking pad locat
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3.5.5 STORMWATER TREATMENT3.5.5.1 M
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3.6.1.1 JURISDICTIONThese projects
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to perform required inspection and
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3.8.2.4 SHARED ACCESS AND EASEMENTS
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3.8.2.8 STREAM ENVIRONMENT ZONES (S
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Sediment versus erosion:Suspended s
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CONTENTSCHAPTER 4: BMP TOOLKIT ....
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CHAPTER 4: BMP TOOLKIT4.1 HYDROLOGI
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4.1.1.1 PERVIOUS PAVEMENTAlternativ
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• Tree canopy overhead can decrea
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ate determined at the time of insta
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Figure 4.1-a: Pervious ConcreteTRPA
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4.1.1.2 INFILTRATION BASINAlternati
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groundwater, depths to restrictive
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Very few performance monitoring stu
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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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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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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
Page 416 and 417: 4.5.1.2 CONSTRUCTION BOUNDARY FENCI
Page 418 and 419: Figure 4.5-a: Construction Boundary
Page 420 and 421: 4.5.1.3 DEWATERINGDESCRIPTIONDewate
Page 422 and 423: Figure 4.5-b: DewateringTRPA BMP Ha
Page 424 and 425: • Use this settled water to fill
Page 426 and 427: 4.5.1.4 CLEAN WATER DIVERSIONAltern
Page 428 and 429: • Avoid disturbing aquatic specie
Page 430 and 431: • Pipe slope drain: A rigid pipe,
Page 432 and 433: Stream Isolation Techniques:• Tur
Page 434 and 435: Figure 4.5-f: Water DiversionTRPA B
Page 436 and 437: 4.5.1.5 VEGETATION PROTECTIONAltern
Page 438 and 439: • Growing Space: Provide spacing
Page 440 and 441: Figure 4.5-g: Vegetation Protection
Page 442 and 443: 4.5.1.6 TEMPORARY SANITATION FACILI
Page 444 and 445: 4.5.1.7 DUST CONTROLAlternate Names
Page 446 and 447: • Blanket with geotextiles or veg
Page 448 and 449: 4.5.1.8 VEHICLE INGRESS EGRESS MANA
Page 450 and 451: • If possible, re-use swept or va
Page 452 and 453: 4.5.1.9 WINTERIZATIONDESCRIPTIONBet
Page 454 and 455: INSPECTION AND MAINTENANCEEnsure th
Page 456 and 457: 4.5.1.10 CONSTRUCTION STAGINGAltern
Page 458 and 459: 4.5.1.11 MATERIAL HANDLING STORAGE
Page 460 and 461: • Ensure that current Material Sa
Page 462 and 463: 4.5.1.12 TOPSOIL SALVAGEAlternative
Page 464 and 465: • If topsoil will not be used for
Page 468 and 469: Figure 4.5-i: Concrete Washout Stat
Page 470 and 471: 4.5.1.14 STOCKPILE MANAGEMENTAltern
Page 472 and 473: Figure 4.5-j: Stockpile ManagementT
Page 474 and 475: 4.5.2 EROSION AND SEDIMENT CONTROLR
Page 476 and 477: 4.5.2.1 SWEEPINGDESCRIPTIONDuring c
Page 478 and 479: 4.5.2.2 DRAIN INLET PROTECTIONAlter
Page 480 and 481: inches. Take care to ensure that no
Page 482 and 483: Figure 4.5-k: Drain Inlet Protectio
Page 484 and 485: 4.5.2.3 FIBER ROLLAlternative Names
Page 486 and 487: • Adjust spacing of fiber rolls a
Page 488 and 489: Figure 4.5-l: Fiber RollsTRPA BMP H
Page 490 and 491: 4.5.2.4 SILT FENCEAlternative Names
Page 492 and 493: • Turn the fabric uphill at the e
Page 494 and 495: Figure 4.5-m: Silt FenceTRPA BMP Ha
Page 496 and 497: 4.5.2.5 EROSION CONTROL BLANKET SYS
Page 498 and 499: structures mark the boundaries of t
Page 500 and 501: Figure 4.5-p: Anchoring Geotextiles
Page 502 and 503: 4.5.2.6 HYDROMULCH, TACKIFIER, AND
Page 504 and 505: INSPECTION AND MAINTENANCE• Hydro
Page 506 and 507: 5.2 SOILSoil is a complex living sy
Page 508 and 509: Tilling green wood chips intothe so
Page 510 and 511: areas such as SEZs and in shorezone
Page 512 and 513: Large boulders provide permanent ve
Page 514 and 515: 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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