BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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PAVING SINGLE FAMILY RESIDENTIAL PROPERTIESFor single family properties built before February 10, 1972 there are twopossible scenarios where a Residential Paving permit may be obtained fromTRPA or the local jurisdiction without a procuring a Site Assessment todetermine available coverage on the parcel:• There is existing dirt parking on site and only the two TRPA-required pavedparking spaces (400 square feet) will be paved,• Or, only a 10-foot wide access to an existing garage which is setback fromthe road will be paved.When paving is completed through a Residential Paving permit or a BMPRetrofit permit, any areas of unpaved compacted dirt areas on the propertymust be restored and protected from further disturbance. If existing compacteddirt areas are verified as being created prior to February 10, 1972 through a SiteAssessment, these areas are considered “grandfathered” and the coverage maycontinue to remain on the property as legally existing, however the surfaceshall be retrofitted with BMPs, either paved or restored. If these areas arerestored without obtaining a Site Assessment, and subsequently submitting aCoverage Banking Application, this coverage cannot be returned to the siteonce it is removed.Single Family Residential homes built after February 10, 1972 will need to paveaccording to previously approved TRPA or local jurisdiction plans andcoverage figures. Additions or modifications will require a new TRPA ProjectApplication.If a property owner wants to pave more than the minimum parking area, a SiteAssessment application must be submitted to the TRPA, or the localjurisdiction, to determine if the property has sufficient available legal coverage.PAVING LARGE MULTI-FAMILY AND COMMERCIAL INDUSTRIALCOMMUNICATIONS AND UTILITIES PROPERTIESDue to the complexity of designing most large developed sites, and the amountof excavation required, most Commercial, Large Multi-family, and Industrialproperties will require the services of a licensed professional civil engineer,landscape architect, or other qualified professional. Paving these types of siteswill typically require land coverage and land capability information as well as aBMP Retrofit permit.7.3.4 CHANGES TO LAND COVERAGETRPA defines land coverage as a man-made structure or improvement thatprevents at least 75 percent of normal precipitation from reaching the groundor land surface used for parking of cars, heavy pedestrian traffic, or other usesthat result in sufficient compaction so as to prevent substantial infiltration ofrainwater and prevents the growth of vegetation on the approved species list.CHAPTER 7: PermittingTRPA BMP HandbookPage 7-4 2012
Parcels developed after July 1987 are evaluated under the Individual ParcelEvaluation System (IPES). Each individual vacant lot has been evaluated forsuitably for development and has an assigned percentage of allowable coverage.Parcels developed prior to July 1987 are evaluated under the Bailey LandCapability System which assigns a Land Capability type 1-7 and an associatedBase Allowable Coverage for each Land Capability. This base allowablecoverage ranges from 1 percent of the parcel area for sensitive lands such asSEZ (Land Capability 1b) to 30 percent for land most suitable for development(Land Capability 7). Additionally, parcels developed prior to February 10, 1972may have legally existing “grandfathered” coverage. Site Assessments (for singlefamily residential properties) or Land Coverage and Land CapabilityVerifications (for multi-family and commercial properties) determine theamount of available coverage.Adding or relocating coverage requires a TRPA Project Application. Paving aminimal amount of dirt parking areas, typically 400 square feet for a singlefamily residential property, does not constitute a change in coverage in mostcases and can be done through a low-cost Residential Paving permit or a freeBMP Retrofit permit.7.3.5 TREE REMOVALTree removal on developed lots in the Lake Tahoe Region does not require apermit if the removed trees are less than 14 inches diameter breast height (dbh)and not located within the Shorezone or an SEZ. In the Shorezone between abuilding structure and Lake Tahoe removal of trees greater than 6 inchesrequire a TRPA permit. Special conditions apply to removal of vegetation inan SEZ and the backshore of the Shorezone. Contact TRPA for moreinformation.Trees marked for removal on TRPA-approved site plans may be removedwithout additional marking. Contact your local Fire Protection District forpermits to remove trees for Fire Defensible Space.Before removing trees or vegetation that provide screening in scenic corridors(e.g. areas visible from Lake Tahoe, Pioneer Trail, or most state highways),property owners should consider the fact that removal of trees could affectscenic scores for future projects and may in some cases constitute a violation ofTRPA scenic regulations if the vegetation was required in order to providescreening for a project. For more information about removing vegetation in ascenic corridor contact TRPA.7.3.6 SHOREZONE MODIFICATIONShoreline protective structures such as walls, earthen banks, bulkheads,revetments, or other devices designed to prevent direct erosion or flooding ofthe backshore by reinforcing the interface between land and water require aTRPA BMP HandbookCHAPTER 7: Permitting2012 Page 7-5
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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
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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
Page 545: TRPA BMP HandbookCHAPTER 5: Soil an
Page 548 and 549: Fertilizer Management PlanProject N
Page 550 and 551: IV. MONITORINGSurface and groundwat
Page 552 and 553: I. PROJECT AND SITE DESCRIPTIONGold
Page 555: Table 5-1: Description of Revegetat
Page 558 and 559: SITE TYPE RECOMMENDED SPECIES LISTS
Page 560 and 561: SITE TYPE RECOMMENDED SPECIES LISTW
Page 562 and 563: CHAPTER 5: Soil and Vegetation Mana
Page 564 and 565: TRPA APPROVED PLANT SPECIES ATTRIBU
Page 566 and 567: TRPA APPROVED PLANT SPECIES ATTRIBU
Page 568 and 569: CHAPTER 5: Soil and Vegetation Mana
Page 570 and 571: • Section 6.2 describes methods f
Page 572 and 573: equirements. At a minimum, training
Page 574 and 575: Vactor equipment removes sediment a
Page 576 and 577: Industrial Properties, Marinas, and
Page 578 and 579: • Rinse the rock with hose water
Page 580 and 581: EXAMPLE INSPECTION AND MAINTENANCE
Page 582 and 583: MONITORING PLAN TEMPLATE1. TITLE PA
Page 584 and 585: MONITORING, INSPECTION, ANDMAINTENA
Page 586 and 587: Sample Site123 Main StreetSouth Lak
Page 588 and 589: 3. MONITORINGIn 2011, South Lake Ta
Page 590 and 591: ATTACHMENT BWATER QUALITY DATA
Page 592 and 593: ATTACHMENT DINSPECTION AND MAINTENC
Page 594 and 595: • Discharge of stormwater from in
Page 598 and 599: TRPA Shorezone permit (www.trpa.org
Page 600 and 601: CHAPTER 8: SHOREZONE PROTECTIVESTRU
Page 602 and 603: technical guidance on structural an
Page 604 and 605: Pope has developed a shorezone miti
Page 606 and 607: ADVANTAGES• Protect parcel develo
Page 608 and 609: Table 8-3: Categorical Classificati
Page 610 and 611: generate observable changes in the
Page 612 and 613: Table 8-5: The General Geomorphic C
Page 614 and 615: 8.1.8.2 TOLERANCE DISTRICT AND BACK
Page 616 and 617: Figure 8-e: Option 2—Backshore De
Page 618 and 619: Scenic Resources and project compli
Page 620 and 621: 8.2 BULKHEADS AND LAKE WALLS8.2.1 O
Page 622 and 623: oth the beach immediately fronting
Page 624 and 625: Like all BMPs, bulkheads and lake w
Page 626 and 627: For a bulkhead located such that th
Page 628 and 629: Figure 8-i: Typical Lake Wall (Grav
Page 630 and 631: Table 8-9: Advantages and Disadvant
Page 632 and 633: maintains its position under wave s
Page 634 and 635: 8.3.4 INSTALLATIONAs with bulkheads
Page 636 and 637: Table 8-11: Advantages and Disadvan
Page 638 and 639: V t ≥ 5R c2(Equation 4.1)Where:Vt
Page 640 and 641: 8.5 BEACH NOURISHMENT AND REPLENISH
Page 642 and 643: of not being able to protect the ba
Page 644 and 645: • The material must be washed to
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nourishment will be determined by m
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Table 8-14: Advantages and Disadvan
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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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Table 8-20: Advantages and Disadvan
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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
Page 730 and 731:
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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