HomeMy WebLinkAboutCT 04-05; VISTA LA COSTA CONDOMINIUMS; PRELIMINARY STORM WATER MANAGEMENT PLAN; 2004-01-15PRELIMINARY STORM WATER
MANAGEMENT PLAN
For
VISTA LA COSTA CONDOS
CT 04-05
CP 04-01
GPA 04-14
ZC 04-09
Prepared:January 15, 2004
Revised:June 8, 2004
JN 03-1060/5
Prepared By:
O'DAY CONSULTANTS
2710 Loker Ave West, Suite 100
Carlsbad, CA 92008
,i..oVESS/ON4e Fy
1`‘
mg
No. C55187
Exp. 6130/06"tX
OF cm0‘
Jo n P. Strohminger RCE 55187 Date
Prepared by: TTC
TABLE OF CONTENTS
1.0 PROJECT DESCRIPTION 3
1.1 Hydrologic Unit Contribution 3
1.2 Beneficial Uses 3
2.0 CHARACTERIZATION OF PROJECT RUNOFF 4
2.1 Soil Characteristics 4
2.2 Potential Discharges 4
3.0 MITIGATION MEASURES TO PROTECT WATER QUALITY 5
3.1 Construction BMPs 5
3.2 Post Construction BMPs 5
4)3.2.1 Dry street sweeping 6
3.2.2 Brow ditch maintenance 6
3.2.3 Discharge monitoring 6
4 3.2.4 Trash management 6
3.2.5 Landscape and irrigation maintenance 6
3.2.6 Storm drain tiling 6
3.2.7 Minimization of impervious area 7
3.2.8 Bio-filtration swales 7
3.2.9 Trench drain inlet filtration inserts 7
3.2.10 Detention basin 7
4.0 MONITORING, INSPECTION, AND REPORTING 7
Attachments:
1.Beneficial uses for the hydrologic unit
At
2.Vicinity map
3.Project site plan & BMP map
4.Construction phase BMP datasheets
5.Post-construction phase treatment control BMP datasheets
6.Numeric Sizing &Swale velocity calculations
7.Drainage Inlet Filtration Inserts
2 G:\Accts\031060\Storm Water Management Plan
STORM WATER MANAGEMENT PLAN
Federal, state and local agencies have established goals and objectives for storm water quality in
the region.The proposed project, prior to the start of construction activities,will comply with all
federal, state and local permits including the Stormwater Management Plan (SWMP) required
under the County of San Diego Watershed Protection, Stormwater Management, and Discharge
Control Ordinance (WPO) (section 67.871), and the National Pollution Discharge Elimination
System (NPDES) from the Regional Water Quality Control Board (RWQCB).
,i1 The purpose of this SWMP is to address the water quality impacts from the proposed
improvements as shown on the Tentative Map.This project will provide guidelines in
1
developing and implementing Best Management Practices (BMPs)for storm water quality
,1 during construction and post construction.Since the site is less than 1 acre,a Storm Water
Pollution Prevention Plan will not be required.
-7(
1.0 PROJECT DESCRIPTION•
The project site is approximately 0.9 acres of land located on Gibraltar Street, about 1 mile east
of El Camino Real (see vicinity map, attachment 2). The site consists of lots 376 and 377 of the
me La Costa South Unit No.5 subdivision (Map #6600, recorded 3/10/1970). Currently the lots are
graded, but they contain no structures. This project proposes a multi-family development of two
buildings with a total of 15 units.
,1.1 Hydrologic Unit Contribution
Jo(The project is located in the Batiquitos Hydrologic Subarea (904.51)of the San Marcos
Watershed in the Carlsbad Hydrologic Unit in the San Diego Region. The site drains northeast
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and connects to an existing 48" RCP drainage pipe which runs along the easterly boundary of the
.0)property, this pipe then releases water to a channel on the La Costa Resort and Spa golf course.It
then travels about 1.5 miles west to Batiquitos Lagoon. This project represents less than 0.01%
.,.--of the Batiquitos Hydrologic Subarea.
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The proposed project will not alter the drainage patterns on site. An underground detention basin
at the northeasterly end ofthe site will limit peak discharge to pre-development levels.
1.2 Beneficial Uses
„--„1The beneficial uses for the hydrologic unit are included in attachment 1,and the definitions are
listed below. This information comes from the Water Quality Control Plan for the San Diego
1
Basin.
REC 1 -Contract Recreation: Includes uses of water for recreational activities involving body.contact with water, where ingestion of water is reasonably possible.These uses include, but are
not limited to, swimming, wading, water-skiing, skin and SCUBA diving, surfing, white water
activities, fishing, or use of natural hot springs.
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3 G:\Accts\031060\Storm Water Management Plan.doc
two 1
REC 2 —Non-Contact Recreation:Includes the uses of water for recreational activities
involving proximity to water,but not normally involving body contact with water,where
ingestion of water is reasonably possible.These include,but are not limited to, picnicking,
sunbathing, hiking, camping, boating, tide pool and marine life study, hunting, sightseeing, or
aesthetic enjoyment in conjunction with the above activities.
BIOL —Preservation of Biological Habitats of Special Significance: Includes uses of water
that support designated areas or habitats,such as established refuges,parks,sanctuaries,
ecological reserves, or Areas of Special Biological Significance (ASBS), where the preservation
or enhancement of natural resources requires special protection.
EST —Estuarine Habitat: Includes uses of water that support estuarine ecosystems including,
but not limited to, preservation or enhancement of estuarine habitats, vegetation, fish, shellfish,
or wildlife (e.g., estuarine mammals, waterfowl, shorebirds).
WILD —Wildlife Habitat: Includes uses of water that support terrestrial ecosystems including
Sri but not limited to, preservation and enhancement ofterrestrial habitats, vegetation, wildlife, (e.g.,
mammals, birds, reptiles, amphibians, invertebrates), or wildlife water food and sources.
RARE —Rare,Threatened,or Endangered Species:Includes uses of water that support
habitats necessary, at least in part, for the survival and successful maintenance ofplant or animal
species established under state or federal law as rare, threatened, or endangered.
MAR —Marine Habitat: Includes uses of water that support marine ecosystems including, but
.441 not limited to, preservation or enhancement or marine habitats, vegetation such as kelp,fish,
shellfish, or wildlife (e.g., marine mammals, shorebirds).
MIGR —Migration of Aquatic Organisms:Includes uses of water that support habitats3necessaryformigration,acclimatization between fresh and salt water,or other temporary
activities by aquatic organisms, such as anadromous fish.
2.0 CHARACTERIZATION OF PROJECT RUNOFF
According to the California 1998 303d list published by the RWQCB, there are no impaired
water bodies associated with the direct stormwater discharge from this project.
The total disturbed area for this project is 0.88 acres. The pre-development runoff from this area
is 1.84 cfs with a "C"value of 0.45,and the post-development runoff is 3.38 cfs with a
composite "C"value of 0.70. The time of concentration decreases from 10.95 minutes to 8.45
minutes. The detention basin at the north end of the site will limit the peak discharge to less than
1.84 cfs.
2.1 Soil Characteristics
The project area consists entirely of soil group D.
2.2 Potential Discharges
There are no sampling data available for the existing site condition.The project will contain
some pollutants commonly found on similar developments that could affect water quality. The
following list is taken from attachment G-1 of the County of San Diego's Stormwater Standards
Manual.It includes anticipated pollutants for attached residential developments.
4 GAAccts1031060\Storm Water Management Plan doe
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1
1.Sediment discharge due to construction activities
2.Nutrients from fertilizers
3.Trash and debris
1 4.Oxygen demanding substances
5.Oil and grease from paved areas
6.Bacteria and viruses
7.Pesticides from landscaping and home use
1
'I 3.0 MITIGATION MEASURES TO PROTECT WATER QUALITY
t
.)To address water quality for the project, BMPs will be implemented during construction and post
construction.
ixil 3.1 Construction BMPs
1,4-The following is a list of potential construction phase BMPs to be used.Datasheets for these
BMPs, taken from the CalTrans BMP manual, can be found in attachment 4.aii
1.Silt fence, fiber rolls, or gravel bag berms
All
2.Check dams
3.Street sweeping and vacuuming
4.Storm drain inlet protection
5.Stabilized construction entrance/exit
6.Vehicle and equipment maintenance, cleaning, and fueling
7.Hydroseed, soil binders, or straw mulch
8.Material delivery and storage
9.Stockpile managementail
10.Spill prevention and control
11. Waste management for solid, liquid, hazardous and sanitary waste, contaminated soil.
12. Concrete waste managementAi
'1 Construction BMPs for this project will be selected, constructed, and maintained to comply with
all applicable ordinances and guidance documents.
3.2 Post Construction BMPs
The following is a list of the post construction BMP's that will be implemented to address water
quality:
1.Dry street sweeping
2.Brow ditch maintenance
3.Discharge monitoring
4.Trash management
5.Landscape and irrigation maintenance
6.Minimization of impervious area
7.Conservation of natural areas
8.Bio-filtration swale
9.Drainage Inlet Filtration Inserts
5 G:\Accts\031060\Storm Water Management Plan.doc
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3.2.1 Dry street sweeping
Source Control BMP
ki...Periodic street sweeping will be performed prior to the rainy season and when significant time
has elapsed between rains.This will help prevent large amounts of trash and silt from washing
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into the stormdrain system.All street areas will be swept, including access roads and driveways.
um Target pollutants: Trash and debris, sediment
.1 3.2.2 Brow ditch maintenance
,wil Source Control BMP
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Cleaning and proper disposal of silt, vegetation, and debris from ditches will be performed on a
regular basis. This will prevent storm water from overtopping and eroding the adjacent slopes.Ai Target pollutants: Trash and debris, sediment
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3.2.3 Discharge monitoring
Source Control BMP
al Notice and education regarding improper discharge of fluids including sewage,hazardous
materials and contaminated stormwater will be provided to the owners and tenants by the sub-
divider.
Target pollutants: Trash and debris, oil and greasej
3.2.4 Trash management
oll Source Control BMP
The Home Owner's Association will enforce trash management standards and provide for debris
...removal at storm drain inlets..Target pollutant: Trash and debris
1 3.2.5 Landscape and irrigation maintenance
Site Design BMP, Source Control BMP
The Home Owner's Association will enforce landscape and irrigation standards for operation and
maintenance ofwatering systems on critical slopes.
Target pollutant: Sediment
1 3.2.6 Storm drain tiling
Site Design BMP, Source Control BMP
1 All storm drain inlets and catch basins within the project shall have a tile that reads:"NO
DUMPING —DRAINS TO BATIQUITOS LAGOON." Legibility of the tiles will be maintained,
and the tiles placed flush with the top of concrete to reduce tripping by pedestrians.
...1Target pollutant: Sediment
—
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6 G:\Accts\031060\Storm Water Management Plan.doc
3.2.7 Minimization ofimpervious area
Site Design BMP
The site has been designed to minimize impervious areas,thereby increasing infiltration and
slowing runoff.
3.2.8 Bio-filtration swales
Treatment Control BMPwwMostoftherunoff from the site will pass through vegetated swales before entering the detention
basin (see attachment 5 for datasheets). These swales will slow storm flows, increase infiltration,
and provide filtration for the first flush runoff.
Target pollutants:Sediment,nutrients,organic compounds,oil and grease,bacteria and
viruses, pesticides.
3.2.9 Trench drain inlet filtration inserts
Treatment Control BMP
All of the runoff from the paved areas enters the trench drain at the entry to Building No. 2(to the
east) and will pass through the insert (see attachment 7 for datasheets).This insert will provide
additional bio-filtration and allow for infiltration of runoff.The Home Owner's Association will
till'be responsible for inspecting the insert every 3 months and performing any necessary
maintenance.
Target pollutants:Sediment,nutrients, trash and debris, oxygen demanding substances,oil and
grease, bacteria and viruses, pesticides.
3.2.10 Detention basin
Treatment Control BMP
All of the runoff from the site will enter an underground detention basin before discharging off
the property. The basin will provide additional bio-filtration through settlement.
Target pollutants:Sediment,nutrients, trash and debris,oxygen demanding substances,oil and
grease, bacteria and viruses, pesticides.
4.0 MONITORING, INSPECTION, AND REPORTING
During construction, the BMPs will be monitored on a weekly basis, and observations recorded
TM on the included checklists (see next page).The party responsible for the monitoring and
maintenance ofthe BMPs is:
*M.
Abedi Family Trust
22982 Ocean Breeze Way
Laguna Nigel, CA 92677
(949)831-4144
7 G:\Accts\031060\Storm Water Management Plan.doc
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4'BMP Objectives
%,•Soil Stabilization•Sediment Control
M..AAN •Tracking Control
,•Wind Erosion Control
"•Non-Storm Water Management
•Materials and Waste Management
113 Definition and A silt fence is a temporary linear sediment barrier of permeable fabric designed to
N Purpose intercept and slow the flow of sediment-laden sheet flow runoff.Silt fences allow
sediment to settle from runoffbefore water leaves the construction site.
dr Appropriate Silt fences are placed:
Applications
• •Below the toe ofexposed and erodible slopes.
• •Down-slope ofexposed soil areas.
gir • •Around temporary stockpiles.
uit • •Along streams and channels.
As I
Limitations • •Not effective unless trenched and keyed in.
• •Not intended for use as mid-slope protection on slopes greater than 1:4
(V:H)
• •Must be maintained.
• •Must be removed and disposed of.
Standards and General
Specifications • •Don't use below slopes subject to creep, slumping, or landslides.
mit i • •Don't use in streams, channels, or anywhere flow is concentrated.
• •Don't use silt fences to divert flow.
Jr*Caltrans
Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Silt Fence SC-1
November 2000 1 of 5
Silt Fence SC-1
Design and Layout
• •The maximum length of slope draining to any point along the silt fence
shall be 61 m (200 ft) or less.
•
• •Slope of area draining to fence shall be less than 1:1 (V:H).
••Limit to locations suitable for temporary ponding or deposition of sediment.
11;
• •Fabric life span generally limited to between five and eight months.Longer
periods may require fabric replacement.
• •Silt fences shall not be used in concentrated flow areas.
-•Lay out in accordance with Page 5 of this BMP.
• •For slopes steeper than 1:2 (V:H) and that contain a high number ofrocks
or large dirt clods that tend to dislodge,it may be necessary to install
additional protection immediately adjacent to the bottom ofthe slope, prior
to installing silt fence.Additional protection may be a chain link fence or a
cable fence.
• •For slopes adjacent to water bodies or Environmentally Sensitive Areas
(ESAs), additional temporary soil stabilization BMPs shall be used.
Materials
••Silt fence fabric shall be woven polypropylene with a minimum width of
a 900 mm and a minimum tensile strength of0.45-kN.The fabric shall
conform to the requirements in ASTM designation D4632 and shall have an
integral reinforcement layer.The reinforcement layer shall be a
polypropylene, or equivalent, net provided by the manufacturer.The
permittivity of the fabric shall be between 0.1 sec' and 0.15 sec"' in
conformance with the requirements in ASTM designation D4491.
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• •Wood stakes shall be commercial quality lumber ofthe size and shape
shown on the plans.Each stake shall be free from decay, splits or cracks
longer than the thickness ofthe stake or other defects that would weaken
the stakes and cause the stakes to be structurally unsuitable.
UM
• •Staples used to fasten the fence fabric to the stakes shall be not less than 45
mm long and shall be fabricated from 1.57 mm or heavier wire.The wire
used to fasten the tops of the stakes together whenjoining 2 sections of
fence shall be 3.05 mm or heavier wire.Galvanizing ofthe fastening wire
will not be required.
ElkCaltrans
Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Silt Fence SC-1
imams.November 2000 2 of 5
Silt Fence SC-1
Installation
••Generally, silt fences shall be used in conjunction with soil stabilization
source controls up slope to provide effective control.
• •Trenches shall not be excavated wider and deeper than necessary for proper
installation ofthe temporary linear sediment barriers.
• •Excavation of the trenches shall be performed immediately before
i[i installation ofthe temporary linear sediment barriers.
1
• •Construct silt fences with a set-back ofat least lm from the toe of a slope.
Q
Where a silt fence is determined to be not practicable due to specific site4'conditions, the silt fence may be constructed at the toe ofthe slope, but shall
be constructed as far from the toe ofthe slope as practicable.
• •Construct the length of each reach so that the change in base elevation
along the reach does not exceed 1/3 the height ofthe barrier; in no case
shall the reach exceed 150 meters.a
• •Cross barriers shall be a minimum of 1/3 and a maximum of 1/2 the height
um,of the linear barrier.
• •Bottom ofthe silt fence shall be keyed-in.
• •Install in accordance with Page 5 ofthis BMP.
Maintenance and • •Repair undercut silt fences.
Inspection
• •Repair or replace split, torn, slumping, or weathered fabric.
• •Inspect silt fence when rain is forecast.Perform necessary maintenance,or
maintenance required by the Resident Engineer (RE).
fel ••Inspect silt fence following rainfall events.Perform maintenance as
or necessary, or as required by the RE.
• •Maintain silt fences to provide an adequate sediment holding capacity.
lie Sediment shall be removed when the sediment accumulation reaches one-
third (1/3)of the barrier height.Removed sediment shall be incorporated in
the project at locations designated by the RE or disposed of outside the
lot highway right-of-way in conformance with the Standard Specifications.
mu,• •Silt fences that are damaged and become unsuitable for the intended
purpose, as determined by the RE, shall be removed from the site of work,
disposed of outside the highway right-of-way in conformance with the
Standard Specifications, and replaced with new silt fence barriers.
riar Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Silt Fence SC-1
wows November 2000 3 of 5
Silt Fence SC-1
• •Holes, depressions or other ground disturbance caused by the removal of
the temporary silt fences shall be backfilled and repaired in conformance
with the Standard Specifications.
• •Remove silt fence when no longer needed or as required by the RE.Fill
and compact post holes and anchorage trench, remove sediment
accumulation, and grade fence alignment to blend with adjacent ground.
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Construction Site Best Management Practices Manual Silt Fence SC-1
gams November 2000 4 of 5
Silt Fence SC-1
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Ertir Caitrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Silt Fence SC-1
NM atibanc November 2000 5 of 5
Check Dams SC-4
•.;!,•
•
•'.'••
r
VM:
BMP Objectives
••Soil Stabilization•Sediment Control•Tracking Control•Wind Erosion Control
tk •Non-Storm Water Management
•Materials and Waste Management
Definition and A check dam is a small device constructed ofrock, sandbags, or fiber rolls, placed
Purpose across a natural or man-made channel or drainage ditch.Check dams reduce
scour and channel erosion by reducing flow velocity and encouraging sediment
dropout.
iss
qui Appropriate • •Check dams may be installed in the following:
Applications -In small open channels which drain 4 ha (10 ac) or less.
Ago -In steep charnels where storm water runoff velocities exceed 1.5
meters per second (m/s).
ARO -During the establishment of grass linings in drainage ditches or
channels.as
-In temporary ditches where a short length ofservice does not warrant
establishment of erosion-resistant linings.
• •This BMP may be implemented on a project-by-project basis with other
o.BMPs when determined necessary and feasible by the Resident Engineer
AP (RE).
^,R Limitations • •Not to be used in live streams.
••Not appropriate in channels which drain areas greater than 4 ha (10 ac).
••Not to be placed in channels which are already grass lined unless erosion is
expected,as installation may damage vegetation.
••Require extensive maintenance following high velocity flows.or
..41q
di
Caltrans Storm Water Quality Handbooks
rrithr Construction Site Best Management Practices Manual Check Dams SC-4
*a'November 2000 1 of 3
Check Dams SC-4
••Promotes sediment trapping which can be re-suspended during subsequent
storms or removal ofthe check dam.
••Not to be constructed from straw bales or a silt fence.
Standards and ••Check dams shall be placed at a distance and height to allow small pools to
Specifications form behind them.
••Install the first check dam approximately five meters (5 m) from the outfall ,
device and at regular intervals based on slope gradient and soil type.
• •For multiple check dam installation, backwater from downstream check
dam shall reach the toe ofthe upstream dam.
• •High flows (typically a 2-year storm or larger) shall safely flow over the
411 check dam without an increase in upstream flooding or damage to the check
dam.
••Where grass is used to line ditches, check dams shall be removed when
grass has matured sufficiently to protect the ditch or swale.
wat:
• •Rock shall be placed individually by hand or by mechanical methods (no
dumping ofrock) to achieve complete ditch or swale coverage.
da Maintenance and • •Inspect check dams after each significant rainfall event.Repair damage as
Inspection needed or as required by the RE.
maij••Remove sediments when depth reaches one-third ofthe check dam height.
• •Remove accumulated sediment prior to permanent seeding or soil
stabilization.rri
*gni
• •Remove check darn and accumulated sediment when check dams are no
longer needed or when required by the RE.
••Removed sediment shall be incorporated in the project at locations
designated by the RE or disposed of outside the highway right-of-way in
conformance with the Standard Specifications.
LINE
'S
art
PPP Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Check Dams SC-4
2 of 3November 2000
Check Dams SC-4
E
Cr-
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Ertr Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Check Dams SC-4
November 2000 3 of 3
Fiber Rolls SC-5I
-4;BMP Objectives•Soil Stabilization
s.•Sediment Control•Tracking Control•Wind Erosion Controli•Jr,
r•."•Non-Storm Water Management•Materials and Waste Management
1 Definition and A fiber roll consists of straw, flax, or other similar materials that are rolled and
Purpose bound into a tight tubular roll and placed on the face of slopes at regular intervals
to intercept runoff, reduce its flow velocity, release the runoffas sheet flow,and
provide some removal of sediment from the runoff.
Appropriate • •May be used along the top, face, and at grade breaks of exposed and
Applications erodible slopes to shorten slope length and spread runoff as sheet flow.
••Fiber rolls may be used as check dams if approved by the Resident
Engineer (RE).
••This BMP may be implemented on a project-by-project basis with other
BMPs when determined necessary and feasible by the RE.
Limitations • •Is a relatively new sediment control/soil stabilization technology.
Effectiveness and capabilities in the field are not completely known.
••Although fiber rolls provide some sediment removal, this BMP is not to be
used in place of a linear sediment barrier (i.e.,a silt fence, sandbag bather,
or straw bale barrier).
Standards and Fiber Roll Materials
Specifications ••Fiber rolls shall be either:
(1)prefabricated rolls; or,
(2)rolled tubes of erosion control blanket.
Er*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Fiber Rolls SC-5
November 2000 1 of 3
Pber Rolls SC-5
Assembly of Field Rolled Fiber Roll
• •Roll length of erosion control blanket into a tube ofminimum 200 mm (8
in) diameter.
• •Bind roll at each end and every 1.2 m (4 ft)along length of roll with jute-
,type twine.
nstalation
• •Locate fiber rolls on level contours spaced 2.4 to 6.0 m (8 to 20 ft)along the
face of slope, or as required by the RE.
• •Stake fiber rolls into a 50 to 100 mm (2 to 4 in) trench.
• •Drive stakes at the end of each fiber roll and spaced 1.2 m (4 ft) maximum
on center.
• •Use wood stakes with a nominal classification of 19 by 19 mm (3/4 by 3/4
in), and minimum length of 600mm (24 in).
••If more than one fiber roll is placed in a row, the rolls shall be butted; notsatoverlapped.
Removal
••Fiber rolls are typically left in place.
• •If fiber rolls are removed, collect and dispose ofsediment accumulation,
and fill and compact holes, trenches, depressions or any other ground
+•.disturbance to blend with adjacent ground.
omi Maintenance and • •Repair or replace split, torn, unraveling, or slumping fiber rolls.
Inspection
rjr • •Inspect fiber rolls when rain is forecast.Perform maintenance as needed or
as required by the RE.
• •Inspect fiber rolls following rainfall events and a least daily during
prolonged rainfall.Perform maintenance as needed or as required by the
RE.
att
*40
Et/Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Fiber Rolls SC-5
November 2000 2 of 3
Fiber Rolls SC-5
t51'-s/
'-i-••,'.•;•1 //
1„,,,10i<(`-V ///1.";;;;. /ip"Note:
41 N 1.1.0 %.*e%11......Install fiber roll-1/,...',44'.:.1:."hi --V-V /1-'•le'''i 'i e 41 along a level contour./1.•.,..:./,"1"/"
//14;4.'•:'.'liI _I/,-4/if e..44:•..„•.....la
.1.4 .//',;,.,//,/,'1111'4/-.11,.....>1.•.:..,I
..ss ''-III -.V
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/Vertical spacing
--.-V
,
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it ,V .,•
..1 measured along the 10 '4'
1 1 -Vfaceoftheslope'a
varies between •.Install a fiber roll near..2.4 m and 6.0 m slope where it transitions
-V into a steeper slope
ow .
TYPICAL FIBER ROLL INSTALLATION
N.T.S.
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i
Fiber roll
....
Slope 200 mm min
varies r;
,t!
.....
AM G c . -
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.
'19 mm x0Eo...to wood stakes
•max 1.2 m
4.0 spacing
ENTRENCHMENT DETAIL
...0.N.T.S.
,...
CI*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Fiber Rolls SC-5
n...„„.„November 2000 3 of 3
Gravel Bag Berm C-6
•
_...#440.0001P
A.4001:6 g;s!
00.,•••••,.deg'
•.
.Aii111P".
,0 BMP Objectives
40P
•Soil Stabilization•Sediment ControlAP•Tracking Control
pe;
•Wind Erosion Control•Non-Storm Water Management
•Materials and Waste Management
Definition and A gravel bag berm consist of a single row of gravel bags that are installed end-to-
Purpose end to form a barrier across a slope to intercept runoff, reduce runoff velocity,
release runoff as sheet flow,and provide some sediment removal.-
Appropriate ••Along the face and at grade breaks ofexposed and erodible slopes to
Applications shorten slope length and spread runoffas sheet flow.
••BMP may be implemented on a project-by-project basis with other BMPs
when determined necessary and feasible by the Resident Engineer (RE).
Limitations • •Although this BIVP?will remove some sediment,it is not to be used in place
of a linear sediment barrier (i.e.,a silt fence, sandbag barrier, or straw bale
barrier).
• •Degraded gravel bags may rupture when removed, spilling contents.
••Installation can be labor intensive.
• •Limited durability for long term projects.
Standards and Materials
Specifications ••Bag Material:Bags shall be woven polypropylene, polyethylene or
polyamide fabric or burlap, minimum unit weight 135 g/m2 (four ounces per
square yard), mullen burst strength exceeding 2,070 kPa (300 psi) in
conformance with the requirements in ASTM designation D3786, and
ultraviolet stability exceeding 70 percent in conformance with the
requirements in ASTM designation D4355.
Ear&
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Gravel Bag Berm SC-6
November 2000 1 of 2
etravell Bag Berm SC-6
• •Bag Size:Each gravel-filled bag shall have a length of450 mm (18 in),
width of 300 mm (12 in), thickness of 75 mm (3 in), and mass of
approximately 15 kg (331b).Bag dimensions are nominal, and may vary
based on locally available materials.Alternative bag sizes shall be
submitted to the Resident Engineer (RE) for approval prior to deployment.
• •Fill Material: Fill material shall be one-half to one-inch Class 2 aggregate
base, clean and free from clay and deleterious material, conforming to the
provisions in Section 26-1.02 "Class 2 Aggregate Base,"ofthe Standard
Specifications.Fill material is subject to approval by the RE.
Installation
• •Install along a level contour.if*
• •Tightly abut bags
Maintenance and • •Inspect gravel bag berms before and after each rainfall event, and weekly
Inspection throughout the rainy season.
• •Reshape or replace gravel bags as needed, or as directed by the RE.
FIN • •Repair washouts or other damages as needed, or as directed by the RE.
••Inspect gravel bag berms for sediment accumulations and remove sediments
when accumulation reaches one-third of the berm height.Removed
sediment shall be incorporated in the project at locations designated by the
RE or disposed of outside the highway right-of-way in conformance with
the Standard Specifications.
• •Remove gravel bag berms when no longer needed.Remove sediment
accumulation, and clean, re-grade, and stabilized the area.Removed
sediment shall be incorporated in the project at locations designated by the
RE or disposed of outside the highway right-of-way in conformance with
the Standard Specifications.
gib Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Gravel Bag Berm SC-6
.40 th/h.„....November 2000 2 of 2
Material Delivery and Storage
liN11/1-11
Standards and General
Specifications -•Train employees and subcontractors on the proper material delivery and
storage practices.
• •Temporary storage area shall be located away from vehicular traffic.
• •Material Safety Data Sheets (MSDS) shall be supplied to the Resident
Engineer (RE)for all materials stored.
Material Storage Areas and Practices
Liquids, petroleum products, and substances listed in 40 CFR Parts 110, 117,or
302 shall be handled in conformance with the following provisions:
• •Storage, preparation, and mixing shall be accomplished in temporary
containment facilities.Each temporary containment facility shall provide a
spill containment volume equal to 1.5 times the volume of all containers
therein and shall be impervious to the materials contained therein for a
minimum contact time of72 hours.
• •Sufficient separation shall be provided between stored containers to allow
ANN for spill cleanup and emergency response access.
••Incompatible materials, such as chlorine and ammonia, shall not be stored
in the same temporary containment facility.
••To provide protection from wind and rain, throughout the rainy season,
temporary containment facilities shall be covered during non-working days
and prior to rain events.
••Temporary containment facilities shall be maintained free of accumulated
rainwater and spills.
• •Materials shall be stored in their original containers and the original product
labels shall be maintained in place in a legible condition.Damaged or
otherwise illegible labels shall be replaced immediately.
• •Liquid materials, petroleum products, and substances listed in 40 CFR Parts
110, 117 or 302 shall be stored in approved containers and drums shall not
be overfilled.Containers shall be placed in temporary containment
Jam facilities for storage.
••Bagged and boxed materials shall be stored on pallets and shall not be
allowed to accumulate on the ground.To provide protection from wind andtit4rain, throughout the rainy season, bagged and boxed materials shall be
covered during non-working days and prior to rain events.
air*Caltrans
Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Material Delivery and Storage WM-1
November 2000 2 of 3
Material Delivery and Storage VIIM-al
••Stockpiles shall be protected in accordance with BMP WM-3, "Stockpile
Management".
••Minimize the material inventory stored on-site (e.g., only a few days
supply).
••Store materials indoors within existing structures or sheds when available.
• •Have proper storage instructions posted at all times in an open and
conspicuous location.
• •Do not store hazardous chemicals, drums, or bagged materials directly on
the ground.Place these items on a pallet and when possible, under cover in
secondary containment.
• •Keep hazardous chemicals well labeled and in their original containers.
• •Keep ample supply of appropriate spill clean up material near storage areas.
• •Also see BMP WM-6, "Hazardous Waste Management", for storing of
hazardous materials;
goi
41 Material Delivery Practices
• •Keep an accurate, up-to-date inventory of material delivered and stored on-
site.
• •Employees trained in emergency spill clean-up procedures shall be present
when dangerous materials or liquid chemicals are unloaded.
ari
Spill Clean-up
• •Contain and clean up any spill immediately.
• •If significant residual materials remain on the ground after construction is
complete, properly remove and dispose any hazardous materials or
contaminated soil.
• •See BMP WM-4,"Spill Prevention and Control", for spills of chemicals
MIN and/or hazardous materials.
Maintenance and • •Storage areas shall be kept clean, well organized, and equipped with ample
Inspection clean-up supplies as appropriate for the materials being stored.
••Perimeter controls, containment structures, covers, and liners shall be
repaired or replaced as needed to maintain proper function.
Imo
••Inspect storage areas before and after rainfall events, and at least weekly
during other times.
Caltrans Storm Water Quality HandbooksriltConstruction Site Best Management Practices Manual Material Delivery and Storage WM-1
November 2000 3 of 3
Material Use *M-21
.z
•
r•Is •BMP Objectives
'•'Z
•Soil Stabilization
,•Sediment Control
•Tracking Control
•Wind Erosion Control
•Non-Storm Water Management
"°"•Materials and Waste Management
Definition and These are procedures and practices for use of construction material in a manner
Purpose that minimizes or eliminates the discharge ofthese materials to the storm drain
system or to watercourses.
Appropriate This BMP applies to all construction projects.These procedures apply when the
Applications following materials are used or prepared on site:
• •Pesticides and herbicides
• •Fertilizers
• •Detergents
• •Plaster
• •Petroleum products such as fuel, oil, and grease
••Asphalt and other concrete components
••Hazardous chemicals such as acids, lime, glues, adhesives, paints, solvents,
and curing compounds
••Concrete compounds
••Other materials that may be detrimental if released to the environment
Limitations • •Safer alternative building and construction products may not be available or
suitable in every instance.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual
Material Use WM-2
1 of 2
November 2000
Material Use
Standards and • •Material Safety Data Sheets (MSDS) shall be supplied to the Resident
Specifications Engineer (RE) for all materials.
• •Latex paint and paint cans, used brushes, rags, absorbent materials, and
drop cloths, when thoroughly dry and are no longer hazardous, may be
disposed of with other construction debris.
• •Do not remove the original product label,it contains important safety and
disposal information.Use the entire product before disposing of the
container.
• •Mix paint indoors, or in a containment area.Never clean paintbrushes or
rinse paint containers into a street, gutter, storm drain or watercourse.
Dispose ofany paint thinners, residue and sludge(s), that cannot be
recycled,as hazardous waste.
• •For water-based paint, clean brushes to the extent practical, and rinse to a
drain leading to a sanitary sewer where permitted, or into a concrete
washout pit or temporary sediment trap.For oil-based paints, clean brushes
to the extent practical and filter and reuse thinners and solvents.
• •Use recycled and less hazardous products when practical.Recycle residualfa(paints, solvents, non-treated lumber, and other materials.
• •Use materials only where and when needed to complete the construction
activity.Use safer alternative materials as much as possible.Reduce or
eliminate use of hazardous materials on-site when practical.
• •Do not over-apply fertilizers and pesticides.Prepare only the amount
needed.Strictly follow the recommended usage instructions.Apply
surface dressings in smaller applications,as opposed to large applications,
to allow time for it to work in and to avoid excess materials being carried
off-site by runoff.
41111 • •Application of herbicides and pesticides shall be performed by a licensed
applicator.
• •Contractors are required to complete the "Report of Chemical Spray Forms"
when spraying herbicides and pesticides.
ale • •Keep an ample supply of spill clean up material near use areas.Train
employees in spill clean up procedures.
• •Avoid exposing applied materials to rainfall and runoff unless sufficient
time has been allowed for them to dry.
Maintenance and ••Spot check employees and subcontractors monthly throughout the job to
Inspections ensure appropriate practices are being employed.
.64
Aryfr Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Material Use WM-2
ism November 2000 2 of 2a/tam
Hydroseeding SS-4
r114
wo.
.11 4
-,
,
•.143 4A'*
1.SYt
;?-'•jti,la.
•..;‘4i:
talP
•
•BMP Objectives
aaw •Soil Stabilization
•;
•Sediment Control
)..A.;•Tracking Control
•Wind Erosion Control
klittikl...i.;•'
-
'184%•Non-Storm Water Management
sui •Materials and Waste Management
•it'g
Definition and Hydroseeding typically consists of applying a mixture of fiber,seed,fertilizer,
Purpose and stabilizing emulsion with hydro-mulch equipment, which temporarily protects
exposed soils from erosion by water and wind.This is one of five temporary soil
stabilization alternatives to consider.
App
Appropriate • •Hydroseeding is applied on disturbed areas requiring temporary protection
m Applications until permanent vegetation is established, or disturbed areas that must be re-
disturbed following an extended period of inactivity.
v.?Limitations • •Straw mulching may be necessary in addition to hydroseeding during the
establishment of vegetation because temporary vegetation takes several
1111
weeks to establish.
'-•Steep slopes are difficult to protect with temporary seeding.
• •Temporary seeding may not be appropriate in dry periods without
supplemental irrigation.
• •Temporary vegetation may have to be removed before permanent
vegetation is applied.
• •Temporary vegetation is not appropriate for short-term inactivity.
Standards and In order to select appropriate hydroseeding mixtures, an evaluation of site
Specifications conditions shall be performed with respect to:
-Soil conditions -Maintenance requirements
-Site topography -Sensitive adjacent areas
0410
WIN Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Hydroseeding SS-4
nilfrens.November 2000 1 of 3
Hydroseeding SS-4
-Season and climate -Water availability
-Vegetation types -Plans for permanent vegetation
• •Selection of hydroseeding mixtures shall be approved by the Landscape
Architect and the Storm Water Coordinator.
The following steps shall be followed for implementation:
• •Seed mix shall comply with the Standard Specifications, Section 20-2.10,
and the project's special provisions.
• •Avoid use ofhydroseeding in areas where the best management practice
(BMP) would be incompatible with future earthwork activities and would
have to be removed.
dr • •Hydroseeding can be accomplished using a multiple-step or one-step
process.The multiple-step process ensures maximum direct contact of the
seeds to soil.When the one-step process is used to apply the mixture of
fiber,seed, etc., the seed rate shall be increased to compensate for all seeds
not having direct contact with the soil.
• •Prior to application, roughen the slope,fill area,or area to be seeded with
the furrows trending along the contours.See "Slope
Roughening/Terracing/Rounding" BMP (Caltrans Storm Water Quality
Ns Handbooks -Project Planning and Design Manual, May 2000).
••Apply a straw mulch to keep seeds in place and to moderate soil moisture
and temperature until the seeds germinate and grow.
aim
• •All seeds shall be in conformance with the California State Seed Law ofthe
;
Department of Agriculture.Each seed bag shall be delivered to the site
sealed and clearly marked as to species, purity, percent germination,
ell dealer's guarantee,and dates oftest.The container shall be labeled to
clearly reflect the amount ofPure Live Seed (PLS) contained.All legume
seed shall be pellet-inoculated.Inoculant sources shall be species specific
4N111
and shall be applied at a rate of 2 kg of inoculant per 100 kg of seed (2-lb
inoculant per 100-lb seed).
so .
• •Commercial fertilizer shall conform to the requirements ofthe California
4111111 Food and Agricultural Code.Fertilizer shall be pelleted or granular form.
do
• •Follow-up applications shall be made as needed to cover weak spots, and to
maintain adequate soil protection.
• •Avoid over-spray onto the travel way, sidewalks, lined drainage channels
and existing vegetation.
Caltrans Storm Water Quality HandbooksbeConstruction Site Best Management Practices Manual Hydroseeding SS-4
2 of 3
November 2000
Hydroseeding SS-4
Maintenance and • •All seeded areas shall be inspected for failures and re-seeded, fertilized, and
Inspection mulched within the planting season, using not less than halfthe original
application rates.Any temporary revegetation efforts that do not provide
adequate cover must be revegetated as required by the Resident Engineer
(RE).
••After any rainfall event, the Contractor is responsible for maintaining all
slopes to prevent erosion.
I
t.
An
I
Apu
las ,
4111
MIMI
Ain
1111
WWI Caitrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Hydroseeding SS-4solNovember 2000 3 of 3
_Soil Binders SS-5
..,
tamil he''..
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',I.111 •'*-'i''.'
,',:
'
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'.BMP Objectives
Ai •Soil Stabilization
:1324a .
'.4.'I _
-
;
''
..4,:r..t=.:.!....• •Sediment Control
mg gm?t:-L...:.:....
Zil12:•"5%.
.>.
•Tracking Control
32/1
-
.'"":".. li "e.•;••"
.'
-V -...''.:.1.'..s.
-.•:••.:..•Wind Erosion Control
r.„.11W.:::3::E..:'=.:':.:1.1:-,:-_:'4.e 1:;1.
-
' ,..::"F '''..q'::',.''':'';
'"
.';:.'::-'..1..3':.‘'•Non-Storm Water Management
ow f;4.-ij.:'..i..1;...:l ;....._.-.;it....1.;'.";•„';....
-
..;.:‘;`.i,.;',":,:i....'..-:.•.:.'•'''.1,-'.'inv-i •Materials and Waste Management
Definition and Soil binders consist of applying and maintaining polymeric or lignin sulfonate soil
Purpose stabilizers or emulsions.Soil binders are materials applied to the soil surface to
temporarily prevent water-induced erosion ofexposed soils on construction sites.
Soil binders typically also provide dust, wind and soil stabilization (erosion
control) benefits.This is one of five temporary soil stabilization alternatives to
consider.
....,Appropriate Soil binders are applied to disturbed areas requiring short-term temporary
Applications protection.Because soil binders can often be incorporated into the work, they
may be a good choice for areas where grading activities will soon resume.
Limitations • •Soil binders are temporary in nature and may need reapplication.
• •Soil binders require a minimum curing time until fully effective,as
prescribed by the manufacturer, which may be 24 hours or longer.
—• •Soil binders will generally experience spot failures during heavy rainfall
events.If runoff penetrates the soil at the top ofa slope treated with a soil
binder,it is likely that the runoff will undercut the stabilized soil layer and
...discharge at a point further down slope.
• •Soil binders do not hold up to pedestrian or vehicular traffic across treated
areas.
••Soil binders may not penetrate soil surfaces made up primarily of silt and
clay, particularly when compacted.
••Some soil binders may not perform well with low relative humidity.Under
rainy conditions, some agents may become slippery or leach out of the soil.
CVCaltrans
Storm Water Quality Handbooks Soil Binders SS-5
Construction Site Best Management Practices Manual
November 2000
1 of 5
ar/byrns
Soil Binders SS-5
••May not cure if low temperatures occur within 24 hours ofapplication.
Standards and General Considerations
Specifications • •Regional soil types will dictate appropriate soil binders to be used.
••A soil binder must be environmentally benign (non-toxic to plant and
animal life), easy to apply, easy to maintain, economical, and shall not stain
K.paved or painted surfaces.
i • •Some soil binders are compatible with existing vegetation.
• •Performance of soil binders depends on temperature, humidity, and traffic
across treated areas.
• •Avoid over-spray onto the traveled way, sidewalks, lined drainage channels,
.,/and existing vegetation.
Selecting a Soil Binder
Properties of common soil binders used for erosion control are provided on Table
,,,.1 1.Use Table 1 to select an appropriate soil binder.
Id Factors to consider when selecting a soil binder include the following:
timil
1
1
••Suitability to situation -Consider where the soil binder will be applied;if it
di.needs a high resistance to leaching or abrasion, and whether it needs to be
11111
compatible with any existing vegetation.Determine the length oftime soil
MI stabilization will be needed, and if the soil binder will be placed in an area
where it will degrade rapidly.In general, slope steepness is not a
viol discriminating factor for the listed soil binders.The soil binders in Table 1
may also be used for dust control using the provided dust control
Ili application rates.The dust control application rates will not be adequate to
4.I
provide protection from water-induced erosion.
g',• •Soil types and surface materials -Fines and moisture content are key
.."properties ofsurface materials.Consider a soil binder's ability to penetrate,
likelihood of leaching, and ability to form a surface crust on the surface
NI materials.
il.••Frequency of application -The frequency ofapplication can be affected by
km subgrade conditions, surface type, traffic volumes, climate, and
maintenance schedule.Frequent applications could lead to high costs.
mg.
Application frequency may be minimized if the soil binder has good
ill penetration, low evaporation, and good longevity.Consider also that
..,frequent application will require frequent equipment clean-up.
N.rit Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Soil Binders SS-5
al 1vh.„..November 2000 2 of 5
Soil Binders SS-5
After considering the above factors, the soil binders in Table 1 will be
generally appropriate as follows:
Copolymer: Appropriate for long term soil stabilization in areas where
cross-traffic might occur, or where stabilization needs to be achieved in
conjunction with preserving existing vegetation.Longevity can be up to 2
years,it has a high resistance to abrasion, and is compatible with existing
vegetation.However,it is also relatively costly which makes it less
desirable for short-term or frequent applications.
Lignin sulfonate: Appropriate for short-or medium-term soil stabilization
applications in low traffic areas.The moderate relative cost makes it less
desirable to reapply frequently, though it typically lasts longer than
psyllium or guar.With only moderate penetration and a low resistance to
abrasion,it would be more suited to areas which will not be disturbed
frequently by construction activities.
Psyllium/Guar: Appropriate for typical soil stabilizing situations or short-
term applications.Because ofthe relatively low cost, they can be applied
more frequently.Their high penetration provides good stabilization but
1 their moderate resistance to abrasion limits their longevity.They are not
very compatible with vegetation.
Applying Soil Binders
After selecting an appropriate soil binder, the untreated soil surface must be
prepared before applying the soil binder.The untreated soil surface must contain
sufficient moisture to assist the agent in achieving uniform distribution.In
general, the following steps shall be followed:
••Follow manufacturer's recommendations for application rates, pre-wetting
of application area, and cleaning ofequipment after use.
••Prior to application, roughen embankment and fill areas.Track walkingdushall only be used where rolling is impractical.
• •Soil binders shall not be applied during or immediately before rainfall.
di
• •Avoid over-spray onto the traveled way, sidewalks, lined drainage channels,
"di sound walls, and existing vegetation.
rrr
••Do not apply soil binders to frozen soil,areas with standing water, under
.01 freezing or rainy conditions, or when the temperature is below 4°C (40°F).
MIN • •More than one treatment is often necessary, although the second treatment
MN may be diluted or have a lower application rate.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Soil Binders SS-5
November 2000 3 of 5
Soil Binders SS-5
••Generally, soil binders require a minimum curing time of24 hours before
they are fully effective.Refer to manufactufer's instructions for specific
cure times.
• •For liquid agents:
-Crown or slope ground to avoid ponding.
-Uniformly pre-wet ground at 0.14 to 1.41/m2 (0.03 to 0.3 gal/yd2) or
according to manufacturer's recommendations.
-Apply solution under pressure.Overlap solution 150 to 300 mm (6 to
12 in).
-Allow treated area to cure for the time recommended by the
manufacturer; typically, at least 24 hours.
-Apply second treatment before first treatment becomes ineffective,
using 50% application rate.
-In low humidities, reactivate chemicals by re-wetting with water at 0.5
to 0.91/m2 (0.1 to 0.2 gal/yd2).
mai
Maintenance and • •Reapplying the selected soil binder may be needed for proper maintenance.
Inspection High traffic areas shall be inspected on a daily basis, and lower traffic areas
should be inspected on a weekly basis.
• •After any rainfall event, the Contractor is responsible for maintaining all
IREI slopes to prevent erosion.
mi
nw
r*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Soil Binders SS-5
November 2000 4 of 5
Soil Binders SS-5
Table 1
Properties of Soil Binders for Erosion Control
Chemicals Copolymer Lignin Sulfonate Psyllium Guar
Comments -Forms semi-permeable -Paper industry waste -Effective on dry,-Effective on dry,
transparent crust.product hard soils hard soilsI-Resists ultraviolet -Acts as dispersing -Forms a crust -Forms a crust
radiation and moisture agent•induced breakdown.-Best in dry climates
it -Can be slippery
il Relative Cost High Moderate Low Low
,ir Environmental Low Low Low Low
Hazard
4,Penetration Moderate Moderate High High
4.11'Evaporation Moderate Moderate Moderate Moderate
44Highr
to Low High High
Leaching
Resistance to High Low Moderate Moderate
Abrasionsno.
Longevity 1 to 2 years 6 months to 1 year 3 to 6 months 3 to 6 monthsNI
Minimum Curing 24 hours 24 hours 24 hours 24 hours
w•Time before Rain
Compatibility with Good Poor Poor PoorimsExisting Vegetation
at.Mode of Chemically Degradable Biologically/Physically/Biologically Biologically
am"
Degradation Chemically Degradable Degradable
No No
Degradable
Labor Intensive No No
••••,Specialized Yes Yes Yes Yes
ApplicationgirlEquipment
•Liquid/Powder Liquid Powder Powder Powderam4
Surface Crusting Yes Yes, but dissolves on Yes, but dissolves Yes, but dissolvesdirewettingon rewetting on rewetting
gn Clean-Up Solvents Solvents Water Water
ine Erosion Control Apply 800-1,000 I/ha (85-Apply 5,600-6,500 I/ha Apply 170 kg/ha Apply 110-220 kg/ha
Application Rate 110 gal/ac).(600-700 gal/ac).(150 lb./ac) with (100-200 lbs./ac)
560-2,200 kg/ha with 560-2,200WM(500-2,000 lbs./ac)kg/ha (500-2,000
is fiber mulch.lbs./ac) fiber mulch.
Dust Control Apply 280-520 Uha (30-Loosen surface 25-Apply 170 k/ha (150 Apply at 45-70 k/ha
Ion ,Application Rate 55 gaVac).50mm (1-2 in).Need 4-lbs./ac).(40-60 lbs./ac).
8% fines.Apply 470-
1 ,900 I/ha (50-200
gal/ac).
am
—re*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Soil Binders SS-5
sms November 2000 5 of 5
straw Mulch SS-61
7-,4 co
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-'BMP Objectives
P."•Soil Stabilizationi0•Sediment Control
Pr •Tracking Control
•Wind Erosion Control
•Non-Storm Water Management
r •Materials and Waste Management
1
I Definition and Straw mulch consists of placing a uniform layer of straw and incorporating it into
Purpose the soil with a studded roller or anchoring it with a tackifier.This is one of five
temporary soil stabilization alternatives to consider.
Appropriate ••Straw mulch is used for soil stabilization as a temporary surface cover on
Applications disturbed areas until soils can be prepared for re-vegetation and permanent
vegetation is established.
••Also typically used in combination with temporary and/or permanent
seeding strategies to enhance plant establishment.
Limitations ••Availability of erosion control contractors and straw may be limited prior to
the rainy season due to high demand.
••There is a potential for introduction of weed-seed and unwanted plant
material.
• •When straw blowers arc used to apply straw mulch, the treatment areas
must be within 45 m (150 ft) ofa road or surface capable of supporting
trucks.
• •Straw mulch applied by hand is more time intensive and potentially costly.
••May have to be removed prior to permanent seeding or soil stabilization.
••"Punching"of straw does not work in sandy soils.
Of Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Straw Mulch SS-6
1 of 3
November 2000
Straw Mulch SS-6
Standards and -•Straw shall be derived from wheat, rice, or barley.
Specifications • •All materials shall conform to Sections 20-2.06, 20-2.07 and 20-2.11 ofthe
Standard Specifications.
••A tackifier is the preferred method for anchoring straw mulch to the soil on
slopes.
• •Crimping, punch roller-type rollers, or track-walking may also be used to
incorporate straw mulch into the soil on slopes.Track walking shall only
be used where other methods are impractical.
• •Avoid placing straw onto the traveled way, sidewalks, lined drainage
channels, sound walls, and existing vegetation.
• •Straw mulch with tackifier shall not be applied during or immediately
before rainfall.
Application Procedures
IMP • •Apply loose straw at a minimum rate of 3,570 kg/ha (4,000 lb./acre), or as
indicated in the project's special provisions, either by machine or by hand
distribution.
gm:• •The straw mulch must be evenly distributed on the soil surface.iis
• •Anchor the mulch in place by using a tackifier or by "punching"it into the
$1114 soil mechanically.
dui
• •A tackifier acts to glue the straw fibers together and to the soil surface.The
tackifier shall be selected based on longevity and ability to hold the fibers in
place.
• •A tackifier is typically applied at a rate of 140 kg/ha (125 lb/ac).In windy
Mir conditions, the rates are typically 200 kg/ha.
• •Methods for holding the straw mulch in place depend upon the slope
steepness,accessibility, soil conditions and longevity.If the selected
method is incorporation of straw mulch into the soil, then do as follows:
-Applying and incorporating straw shall follow the requirements in
Section 20-3.03 ofthe Standard Specifications.
eft -On small areas,a spade or shovel can be used.
dill
-On slopes with soils which are stable enough and of sufficient gradient
to safely support construction equipment without contributing to
as compaction and instability problems, straw can be "punched" into the
IMO Caltrans Storm Water Quality HandbooksEt"Construction Site Best Management Practices Manual Straw Mulch SS-6
4111 November 2000 2 of 3
Straw Mulch SS-6
ground using a knife-blade roller or a straight bladed coulter, known
commercially as a "crimper".
-On small areas and/or steep slopes, straw can also be held in place
using plastic netting or jute.The netting shall be held in place using 11
gauge wire staples, geotextile pins or wooden stakes (as described in
4 BMP SS-7, "Geotextiles, Plastic Covers and Erosion Control
Blankets/Mats".
4 Maintenance and • •The key consideration in maintenance and inspection is that the straw needs
Inspections to last long enough to achieve erosion control objectives.
a • •Reapplication of straw mulch and tackifier may be required by the Resident
Engineer to maintain effective soil stabilization over disturbed areas and
slopes.
• •After any rainfall event, the Contractor is responsible for maintaining all
slopes to prevent erosion.
a
ion
rrr
•••
on
WI;
win
few
to
EhCaltrans
Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Straw Mulch SS-6
November 2000 3 of 3
Material Delivery and Storage WM-1
MS
iih
111
;•4
1 B MP Objectives•Soil Stabilization
Sediment Control•Tracking Control,4 •Wind Erosion Control4
W
j •Non-Storm Water Management•-.•Materials and Waste Managementtai
Definition and Procedures and practices for the proper handling and storage ofmaterials in aPurposemanner that minimizes or eliminates the discharge of these materials to the storm
drain system or to watercourses.
Appropriate These procedures are implemented at all construction sites with delivery andApplicationsstorageofthe following:
••Soil
••Pesticides and herbicides
••Fertilizers
••Detergents
• •Plaster
• •Petroleum products such as fuel, oil, and grease
••Asphalt and concrete components
••Hazardous chemicals such as acids,lime, glues, adhesives, paints, solvents,
and curing compounds
• •Concrete compounds
••Other materials that may be detrimental if released to the environment
Limitations ••Space limitation may preclude indoor storage.
••Storage sheds must meet building & fire code requirements.
irty.Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Material Delivery and Storage WM-1November 2000
1 of 3
Street Sweeping and Vectuiralup SC-7
"I
Siiii•.•••,41-;
1 .I 1 I i.
-n.-117,3
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f...1,BMP Objectives,_..-•Soil Stabilization
,<
•';-•.,,,;,,--•Sediment ControlI'''''4.i i`c.o.°.•Tracking Control
.'r.,.‘ 40.30.‘'r•'••Wind Erosion Control
1.4 '.4.0
..00'......./
•Non-Storm Water Management—•Materials and Waste Management,,,,,
,a
.Definition and Practices to remove tracked sediment to prevent the sediment from entering a
Purpose storm drain or watercourse.
Appropriate These practices are implemented anywhere sediment is tracked from the project
Applications site onto public or private paved roads, typically at points of egress.
Limitations Sweeping and vacuuming may not be effective when soil is wet or muddy.
Standards and ••Do not use kick brooms or sweeper attachments.
Specifications • •Inspect potential sediment tracking locations daily.
• •Visible sediment tracking shall be swept and vacuumed on a daily basis.
• •If not mixed with debris or trash, consider incorporating the removed
sediment back into the project.
Maintenance and ••Inspect ingress/egress access points daily and sweep tracked sediment as
Inspection needed, or as required by the Resident Engineer (RE).
••Be careful not to sweep up any unknown substance or any object that may
be potentially hazardous.
••Adjust brooms frequently; maximize efficiency of sweeping operations.
••After sweeping is finished, properly dispose of sweeper wastes at an
approved dumpsite in conformance with the provisions in Section 7-1.13 of
the Standard Specifications.
at/Caftans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Street Sweeping and Vacuuming SC-7eiltainNovember 2000 1 of 1s.
Storm Drain Inlet Protection ISC-101
00........•.•.L....,44_4.
A01016.70 Olof Or%SAlt kNk,..//
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,-----•Tracking Control•Wind Erosion Control
,,,,,:.,11"'.
•Non-Storm Water Management\•Materials and Waste Management
,.4
Definition and Devices used at storm drain inlets that are subject to runoff from constructionPurposeactivities to detain and/or to filter sediment-laden runoff to allow sediment to
settle and/or to filter sediment prior to discharge of storm water into storm water
drainage systems or watercourses.
Appropriate • •Where ponding will not encroach into highway traffic.
Applications
• •Where sediment laden surface runoff may enter an inlet.
• •Where disturbed drainage areas have not yet been permanently stabilized.
••Where the drainage area is 0.4 ha (1 ac)or less.
1 ••Appropriate during wet and snow-melt seasons.
Limitations ••Use only when ponding will not encroach into highway traffic or onto
erodible surfaces and slopes.If safety is a concern, use other methods of
temporary protection to prevent sediment-laden storm water and non-storm
water discharges to enter the storm drain system.
••Sediment removal may be difficult in high flow conditions or if runoff is
heavily sediment laden.If high flow conditions are expected, use other on-
site sediment trapping techniques in conjunction with inlet protection.
• •Frequent maintenance is required.
••For drainage areas larger than 0.4 ha (1 ac),runoff shall be routed to a
sediment trapping device designed for larger flows.See BMPs SC-2,
"Desilting Basin", and SC-3 "Sediment Traps".
Et.Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Storm Drain Inlet Protection SC-10November 2000
1 of 6
Storm Drain Inlet Protection SC-10
• •Filter fabric fence inlet protection appropriate in open areas is subject to
sheet flow and for flows not exceeding 0.014 m3/s (0.5 cfs).
••Sandbag barriers for inlet protection are applicable when sheet flows or
/II concentrated flows exceed 0.014 m3/s (0.5 cfs), and it is necessary to allow
for overtopping to prevent flooding.
• •Excavated drop inlet sediment traps are appropriate where relatively heavy"NI flows are expected and overflow capability is needed.
Standards and Identify existing and/or planned storm drain inlets that have the potential to
Specifications receive sediment-laden surface runoff.Determine if storm drain inlet protection
is needed, and which method to use.
Methods and Installation
• •DIProtection Type 1 -Filter Fabric Fence -The filter fabric fence (Type
1)protection is illustrated in Page 4.Similar to constructing a silt fence.
See BMP SC-1,"Silt Fence".Do not place filter fabric underneath the inletwe
grate since the collected sediment may fall into the drain inlet when the
fabric is removed or replaced.
au • •DIProtection Type 2 -Excavated Drop Inlet Sediment Trap -The
excavated drop inlet sediment trap (Type 2) is illustrated in Page 5.Similar
to constructing a temporary silt fence,See BMP SC-1,"Silt Fence".SizeANS
excavated trap to provide a minimum storage capacity calculated at the rate
of 130 m3/ha (67 yd3/ac)of drainage area.
• •DIProtection Type 3 -Sandbag Barrier -The sandbag barrier (Type 3) is
illustrated in Page 6.Flow from a severe storm shall not overtop the curb.
In areas of high clay and silts,use filter fabric and gravel as additional filteramemedia.Construct sandbags in accordance with BMP SC-8, "Sandbag
•411111;Barrier".
AS Maintenance and General
qm.Inspection ••Inspect all inlet protection devices before and after every rainfall event, and
weekly during the rest of the rainy season.During extended rainfall events,
inspect inlet protection devices at least once every 24 hours.
we.
• •Inspect the storm drain inlet after severe storms in the rainy season to check
for bypassed material.
••Remove all inlet protection devices within thirty days after the site is
stabilized, or when the inlet protection is no longer needed.
gler Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Storm Drain Inlet Protection SC-10
Ca/tam November 2000 2 of 6
Storm Drain Inlet Protection SC-10
-Bring the disturbed area to final grade and smooth and compact it.
Appropriately stabilize all bare areas around the inlet.
-Clean and re-grade area around the inlet and clean the inside ofthe
storm drain inlet as it must be free ofsediment and debris at the time of
final inspection.
,Is
Requirements by Method
• •Type 1 -Filter Fabric Fence
-Make sure the stakes are securely driven in the ground and are in good
shape (i.e., not bent, cracked, or splintered, and are reasonably
perpendicular to the ground).Replace damaged stakes.
-Replace or clean the fabric when the fabric becomes clogged with
sediment.Make sure the fabric does not have any holes or tears.
011
roi
Repair or replace fabric as needed or as directed by the Resident
Engineer (RE).
-At a minimum, remove the sediment behind the fabric fence when
NW accumulation reaches one-third the height of the fence or barrier
height.Removed sediment shall be incorporated in the project at
locations designated by the RE or disposed of outside the highway
right-of-way in conformance with the Standard Specifications.
••Type 2 -Excavated Drop Inlet Sediment Trap
-Remove sediment from basin when the volume of the basin has been
reduced by one-half.
••Type 3 -Sandbag Barrier
-Inspect bags for holes, gashes, and snags.
-Check sandbags for proper arrangement and displacement.Remove
the sediment behind the barrier when it reaches one-third the height of
the barrier.Removed sediment shall be incorporated in the project at
locations designated by the RE or disposed ofoutside the highway
right-of-way in conformance with the Standard Specifications.
.NP
41111
*mu
r Cs Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Storm Drain Inlet Protection SC-10
November 2000 3 of 6
—----
144 Storm Drain Inlet Protection sc-b
'11.
ilail
'MO Fence Jer !7;C—0I-1GeotextileBlanket44
.4,Drain inlet 5.;
''*,V \.-1 -..-.-
'vs...•.':7"./.
-7 '''•.
"I:..<.<...../.'''/Y/4.V/1\\•0.
al 6 0 0 fl]+ii_--.1
44
sat SECTION A—A
_...
ale
150 mm Min
x
x x x overlap at ends
of silt fence.
Drain inlet
Mei
iNg'<X
_--
eft 1 B.--7--7-:E--MT.
-1...........___-=...----...-..air --Ge ote x t i Ie Blanket
t
x ....---
Sheet flow
t
.
.....
,Less than —s—Silt Fence per SC-01ow'0.4 ha (1 ac)
x x
,......i I x x x x I ,
...
ii*--PLAN (N.
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,....1.ail C.)
i't•
WM
I
it.DI PROTECTION TYPE 1
NOT TO SCALE
mom
:
mo NOTE':::..
Mal I.F Or i.r.:;i in t:Ire ];where gradin a h (AG been completed ..iid final !-:.oil :
-.;tabilizotion
oncl !....eeclinr,j are pendina.im 2 Not applianble in pc:ive.(I ovens-
.1,.Not oi..pli(::nhl e with ::oriaeriti ated flow...,
Mil
.......f
Ellifr
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Storm Drain Inlet Protection SC-10low•November 2000 4 of 6
_,...._
„.,.
...,
..Storm Drain Inlet Protection SC-10
.,.,
„..,
Stabilize area and
iso grade uniformly
so /around perimeter/Geotextile
.os Blon k.et
>
lc
.1
-01—Silt fence Per 50-01jix
as 1:1 sl ober
...........
3 Min i i
N.../,,:2\.Drain inlet .,.,./.\ .,,,. /.4%
300 rrim Min
W\Krs>,--.600 rnm Max
AB ‹..Note:'//..*-----
1.2 m +Remove sediment
Mg before reaching
one-third full.III •
Section A—A
...
i
se flow
14 Concentrated --P."'...... .-
-Rock filter(use if flow
I
---is concentrated)
is
Ira:x '-x---ixpalr
----j<
1 ...„--Edge of
7 ice'.so
iiii\
rsediment trap
Ini x i i
i
..--Drain inlet
XA
Sheet flow -g.i
*IS .------..-======--in----++Geotextilexi
NA I
I
Y.Blanket
L J 1
i
Silt fence Per 50-01
I 1
11111 ..X t_j X()L x_l,,•x x x
0.
(7..
MI r i r)
(,)-,)Plan .,.
0AI
DI PROTEL:TION TYPE
...i NOT TO SCALE
'ii Note
I .For me in cleared and grubbed i7ind in graded areas.
.siq 2 ':.11 o p e basin so that longest inflow (urea faces longest length of trap.
a 3 For concentrated flows,shape boain in 2:I ro tio with length oriented
towards direction of flow.
1
MN
”....!al Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Storm Drain Inlet Protection SC-10
.
WIMP aillYONTS November 2000 5 of 6
Storm Drain Inlet Protection SC-10
Mt
ill.---...
Inlet Edge of Pavement---(77
•
...,.
.
--
••,,j_______
____.._
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.----
Spillway,1—bag highi Sandbags
2—bags high
moll TYPICAL PROTECTION FOR INLET ON SUMP
MI
am1
Or Edge of Pavement
gel
...,_.,----\-----
---,..---..„..... —.....
mu i Spillway,1—bag high --J Sandbags
2—bags high
MR i TYPICAL PROTECTION FOR INLET ON GRADE
IN
-.I .NOTES:
MI 'I.Intended for short—team use.
2.use to inhibit non—storm water flow.
3 Allow for proper maintenance and cleanup.
4 E-k:ig:J;mulct be removed after adjacent operation is completedis5.Nat applicable in areas with high silts and clays without filter fabric.
•Al
via
ier*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Storm Drain Inlet Protection SC-10idNovember 2000 6 of 6
Stabilized Construction Entrance/Exit TC-1I
,•;
rni7rrif -•
_
BMP ObjectivesTIM.•Soil Stabilizatn`•ti0000%°4°•Sediment Corol•Tracking Control
k.4 RAP •Wind Erosion Control•Non-Storm Water Management;i !f •Materials and Waste Management
Definition and A stabilized construction access is a defined point ofentrance/exit to aPurposeconstruction site that is stabilized to reduce the tracking ofmud and dirt ontopublic roads by construction vehicles.
Appropriate ••Use at construction sites:
Applications -where dirt or mud is tracked onto public roads
-adjacent to water bodies
-where poor soils are encountered
-where dust is a problem during dry weather conditions.
• •This BMP may be implemented on a project-by-project basis in addition to
other BMPs when determined necessary and feasible by the Resident
Engineer (RE).
Limitations • •Site conditions will dictate design and need.
Standards and ••Limit the points of entrance/exit to the construction site.Specifications
••Limit speed ofvehicles to control dust.
NiinY
• •Properly grade each construction entrance/exit to prevent runoff from
leaving the construction site.
• •Route runoff from stabilized entrances/exits through a sediment-trapping
device before discharge.
Llijer Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Stabilized Construction Entrance/Exit TC-1November 2000
1 of 4
Stabilized Construction Entrance/Exit TC-1
ink
IN • •Design stabilized entrance/exit to support heaviest vehicles and equipment
that will use it.
err • •Select construction access stabilization (aggregate, asphaltic concrete,
mow,concrete) based on longevity, required performance, and site conditions.
The use of asphalt concrete (AC) grindings for stabilized constructionat
access/roadway is not allowed.
• •Use of constructed or constructed/manufactured steel plates with ribs for
entrance/exit access is allowed with written approval ofthe RE.
• •If aggregate is selected, place crushed aggregate over geotextile fabric to at
least 300 mm (12 in)depth, or place aggregate to a depth recommended by
I..a geotechnical engineer.A crushed aggregate greater than 75 mm (3
inches) but smaller than 150 mm (6 inches) shall be used.
• •Designate combination or single purpose entrances and exits to the
construction site.Require all employees, subcontractors and others to use
them.
••Require that all employees, subcontractors, and suppliers utilize the
stabilized construction access.
Maintenance and • •Inspect routinely for damage and assess effectiveness of the BMP.Repair
Inspection if access is clogged with sediment or as directed by the RE.
on • •Keep all temporary roadway ditches clear.
IN
MI
Caltrans Storm Water Quality Handbookslir*Construction Site Best Management Practices Manual Stabilized Construction Entrance/Exit 1C-1
November 2000 2 of 4
Stabilized Construction Entrance/Exit irc -i
....,
a
Wifa Crushed aggregate greater than 75 mm
(3 in)but smaller than 150 mm (6 in)op
i Filter fabric
r-Originalat_______,:,/&-c;:c.I)00C5,;(
-(-
2)(
--(:PC)6'YL ?-C3(-4.6).(\0 L grade----
A
ipt -.--0 .-&.-.....0L-A______-.-
gok I--300 mm (12 in)Min,unless otherwise
specified by a soils engineeras
...I SECTION B—BdillN TS;
41
i
.
ow NOTE:
_c#Construct sediment barrier
/\(\
_.,0 and channelize runoff to
2)
E
I
sediment trapping device
;....-i (.4,f,<
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Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Stabilized Construction Entrance/Exit TC-1es:ar/frano November 2000 3 of 4
Stabilized Construction Entrance/Exit TC-1
Crushed aggregate greater than 75 mm
(3 in)but smaller than 150 mm (6 in)
Filter fabric
r-Original
------
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specified by a soils engineer
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1.11N Er*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Stabilized Construction Entrance/Exit TC-1
411111 November 2000 4 of 4athrew
Vehicle and Equipment Clearing NS-81....,
ui p---.
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VEHICLE siOfWASH
WIN .............-'.:..''>-'-4':/AREA ..-''.,''--kr-7';
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AEI 'BMP Objectives
..•Soil StabilizationI!•Sediment Control
WO I
:f
4.
rzA
•Tracking Control
.j ,,....,,I .•Wind Erosion Control
•Non-Storm Water Management
•.-reiW..•Materials and Waste Management
—.
Definition and Procedures and practices used to minimize or eliminate the discharge of pollutants
Purpose from vehicle and equipment cleaning operations to storm drain system or to
watercourses.
Appropriate These procedures are applied on all construction sites where vehicle and
Applications equipment cleaning is performed.
Limitations None.
Standards and • •On-site vehicle and equipment washing is discouraged.
Specifications • •Cleaning of vehicles and equipment with soap, solvents or steam shall not
JJ occur on the project site unless the Resident Engineer (RE) has been
....notified in advance and the resulting wastes are fully contained and
disposed of outside the highway right-of-way in conformance with the
provisions in Section 7-1.13 ofthe Standard Specifications.Resulting
AA wastes shall not be discharged or buried within the highway right-of-way.
••Vehicle and equipment wash water shall be contained for percolation or
.*.evaporative drying away from storm drain inlets or watercourses and shall
not be discharged within the highway right-of-way.
...• •All vehicles/equipment that regularly enter and leave the construction site
must be cleaned off-site.
••When vehicle/equipment washing/cleaning must occur on-site, and the
operation cannot be located within a structure or building equipped with
appropriate disposal facilities,the outside cleaning area shall have the
!isle Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Vehicle and Equipment Cleaning NS-8
November 2000 1 of 2
Vehicle and Equipment Cleaning NS-8
following characteristics, and shall be arranged with the construction storm
water coordinator:
-Located away from storm drain inlets, drainage facilities, or
watercourses
ell -Paved with concrete or asphalt and bermed to contain wash waters and
to prevent run-on and runoffmai
rn -Configured with a sump to allow collection and disposal of wash water
-Wash waters shall not be discharged to storm drains or watercourses
-Used only when necessary
• •When cleaning vehicles/equipment with water:a
-Use as little water as possible.High pressure sprayers may use less
water than a hose, and shall be considered.
is -Use positive shutoff valve to minimize water usage.
Maintenance and • •The control measure shall be inspected at a minimum ofonce a week.
Inspection
••Monitor employees and subcontractors throughout the duration ofthe
construction project to ensure appropriate practices are being implemented.
err
• •Inspect sump regularly and remove liquids and sediment as needed or as
1.11
directed by the RE.
wri
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tudd
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41 Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Vehicle and Equipment Cleaning NS-8
thkrans November 2000 2 of 2
Vehicle and Equipment Fueling NS-91
4.
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BMP Objectives
'z ":FUELING N:..)DPI •Soil Stabilization_ad
AREA ME
•
•Sediment Control
•Tracking Control
.
•Wind Erosion Control
•Non-Storm Water Management
•Materials and Waste Management
Definition and Procedures and practices to minimize or eliminate the discharge offuel spills and
Purpose leaks into the storm drain system or to watercourses.
Appropriate These procedures are applied on all construction sites where vehicle and
Applications equipment fueling takes place.
Limitations • •On-site vehicle and equipment fueling shall only be used where it's
impractical to send vehicles and equipment off-site for fueling.
Standards and ••When fueling must occur on-site, the contractor shall select and designate
Specifications an area to be used, subject to approval of the Resident Engineer (RE).
••Absorbent spill clean-up materials and spill kits shall be available in fueling
areas and on fueling trucks and shall be disposed of properly after use.
••Drip pans or absorbent pads shall be used during vehicle and equipment
fueling, unless the fueling is performed over an impermeable surface in a
dedicated fueling area.
••Dedicated fueling areas shall be protected from storm water run-on and
runoff, and shall be located at least 15 m from downstream drainage
facilities and watercourses.Fueling must be performed on level-grade
areas.
••Nozzles used in vehicle and equipment fueling shall be equipped with an
automatic shut-off to control drips.Fueling operations shall not be left
unattended.
414fr
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual
Vehicle and Equipment Fueling NS-9
1 of 2
November 2000
Vehicle and Equipment Fueling NS-9
••Protect fueling areas with berms and/or dikes to prevent run-on, runoff, and
to contain spills.
41111 ••Use vapor recovery nozzles to help control drips as well as air pollution
where required by Air Quality Management Districts (AQMD).
• •Fuel tanks shall not be "topped-off."
••Vehicles and equipment shall be inspected on each day of use for leaks.
Leaks shall be repaired immediately or problem vehicles or equipment shall
be removed from the project site.
di • •Absorbent materials shall be used on small spills instead of hosing down or
burying techniques.The spent absorbent material shall be removed
promptly and disposed of properly.
• •Federal, state, and local requirements shall be observed for any stationary
above ground storage tanks.
• •Mobile fueling of construction equipment throughout the site shall be
minimized.Whenever practical, equipment shall be transported to the'designated fueling area.
Maintenance and • •Fueling areas and storage tanks shall be inspected on a regular basis.
Inspection • •Keep an ample supply of spill cleanup material on the site.
• •Immediately cleanup spills and properly dispose ofcontaminated soil and
cleanup materials.
,a.
dli
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Vehicle and Equipment Fueling NS-9
arafcras November 2000 2 of 2
Vehicle and Equipment Maintenance NS-1OJO.
Jam
•
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WV.40 tiVICV•4'e '
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111;-
B MP Objectives
-
••Soil Stabilization•Sediment Control
•Tracking Control
•Wind Erosion Control•• •
AA...N.,.Ave:.•-Non Storm Water Management
•Materials and Waste Management
Definition and Procedures and practices to minimize or eliminate the discharge ofpollutants to
Purpose the storm drain system or to watercourses from vehicle and equipment
maintenance procedures.
Appropriate These procedures are applied on all construction projects where an on-site yard
Applications area is necessary for storage and maintenance ofheavy equipment and vehicles.
Limitations None identified.
Standards and • •Drip pans or absorbent pads shall be used during vehicle and equipment
Specifications maintenance work that involves fluids, unless the maintenance work is
performed over an impermeable surface in a dedicated maintenance area.
••All fueling trucks and fueling areas are required to have spill kits and/or use
other spill protection devices.
••Dedicated maintenance areas shall be protected from storm water run-on
and runoff, and shall be located at least 15 m from downstream drainage
facilities and watercourses.
••Drip Pans or plastic sheeting shall be placed under all vehicles and
equipment placed on docks, barges, or other structures over water bodies
,„when the vehicle or equipment is planned to be idle for more than one hour.
.•-•Absorbent spill clean-up materials shall be available in maintenance areas
and shall be disposed of properly after use.Substances used to coat asphalt
transport trucks and asphalt spreading equipment shall be non-toxic.
Drainage inlet structures and manholes shall be covered with filter fabric
Lel&
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Vehicle and Equipment Maintenance NS-10
November 2000 1 of 2
Vehicle and Equipment Maintenance NS -101
when seal coat, tack coat ,slurry seal, or fog seal is applied to adjacent
surfaces.Seal coat, tack coat, slurry seal, or fog seal shall not be applied if
rainfall or thunderstorms are predicted to occur during the application or
curing period.
••Use off-site maintenance facilities whenever practical.
••For long-term projects, consider using portable tents or covers over
maintenance areas.
••Properly dispose of used oils, fluids, lubricants and spill cleanup materials.
• •Do not dump fuels and lubricants onto the ground.
• •Do not place used oil in a dumpster or pour into a storm drain or
watercourse.
• •Properly dispose of or recycle used batteries.
••Do not bury used tires.
we,••Repair leaks of fluids and oil immediately.
at'••Provide spill containment dikes or secondary containment around stored oil
and chemical drums.
Maintenance and ••Maintain waste fluid containers in leak proof condition.
Inspection
.03
• •Vehicle and equipment maintenance areas shall be inspected regularly.
••Vehicles and equipment shall be inspected on each day ofuse.Leaks shall
be repaired immediately or the problem vehicle(s) or equipment shall be
460 removed from the project site.
••Inspect equipment for damaged hoses and leaky gaskets routinely.Repair
or replace as needed.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Vehicle and Equipment Maintenance NS-10
November 2000 2 of 2
Stocknile Management 1/11/M-3
.,....•
4
•BMP Objectives
4.
••Soil Stabilization•Sediment Control••Tracking Control•Wind Erosion Control•Non-Storm Water Management
,,•Materials and Waste Management
Definition and Procedures and practices to reduce or eliminate pollution ofstorm water from
Purpose stockpiles ofsoil, and paving materials such as portland cement concrete (PCC)
rubble, asphalt concrete (AC), asphalt concrete rubble, aggregate base, aggregate
subbase or pre-mixed aggregate and asphalt minder (so called "cold mix"
asphalt).
Appropriate Implemented in all projects that stockpile soil and paving materials.
Applications
Limitations None identified
Standards and • •Protection of stockpiles is a year-round requirement.
Specifications • •Locate stockpiles away from concentrated flows of storm water, drainage
courses, and inlets.
••Protect all stockpiles from storm water run-on using a temporary perimeter
sediment barrier such as berms, dikes, silt fences or sandbag barriers.
••Implement wind erosion control practices as appropriate on all stockpiled
material.For specific information see BMP WE-1,"Wind Erosion
Control."
••Stockpiles of contaminated soil shall be managed in accordance with BMP
WM-7 "Contaminated Soil Management".
• •Bagged materials should be placed on pallets and under cover.
Est Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Stockpile Management WM-3
was November 2000 1 of 2
Stockpile Management 1111M-3
Protection of NonActive Stockpiles
Non-active stockpiles ofthe identified materials shall be protected further as
follows:r.
• •Soil stockpiles:
-During the rainy season, soil stockpiles shall be covered or protected
with soil stabilization measures and a temporary perimeter sediment
we barrier at all times.
-During the non-rainy season,soil stockpiles shall be covered or
IMF protected with a temporary perimeter sediment barrier prior to the onset
of precipitation.
otout
All • •Stockpiles ofportland cement concrete rubble, asphalt concrete, asphalt
concrete rubble, aggregate base,or aggregate subbase:
-During the rainy season, the stockpiles shall be covered or protected
with a temporary perimeter sediment barrier at all times.
-During the non-rainy season, the stockpiles shall be covered or
MI protected with a temporary perimeter sediment barrier prior to the onset
ofprecipitation.vo,
• •Stockpiles of "cold mix":
-During the rainy season, cold mix stockpiles shall be placed on and
covered with plastic or comparable material at all times.isr
-During the non-rainy season,cold mix stockpiles shall be placed on
and covered with plastic or comparable material prior to the onset of
precipitation.
Protection of Active Stockpiles
Active stockpiles of the identified materials shall be protected further as follows:MIN
MI • •All stockpiles shall be protected with a temporary linear sediment barrier
prior to the onset ofprecipitation.
• •Stockpiles of "cold mix"shall be placed on and covered with plastic or
comparable material prior to the onset of precipitation.
at Maintenance and • •Repair and/or replace perimeter controls and covers as needed, or as
inspections directed by the RE, to keep them functioning properly.
Elfir Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Stockpile Management WM-3
November 2000 2 of 2
Spill Prevention and Control„„...
„...„A
4Ike
•
BMP Objectives•Soil Stabilization
,
-•Sediment Control4.4 •ftr-a mob •Tracking Control
1
--"*7 tegy¢•Wind Erosion Control
1211 41 •Non-Storm Water Management
N.4 •Materials and Waste Management
Definition and These are procedures and practices implemented to prevent and control spills in a
Purpose manner that minimizes or prevents the discharge of spilled material to the
drainage system or watercourses.
Appropriate This best management practice (BMP) applies to all construction projects.Spill
Application control procedures are implemented anytime chemicals and/or hazardous
substances are stored.Substances may include, but are not limited to:
••Soil stabilizers/binders
••Dust Palliatives
• •Herbicides
• •Growth inhibitors
• •Fertilizers
••Deicing/anti-icing chemicals
••Fuels
••Lubricants
••Other petroleum distillates
To the extent that the work can be accomplished safely, spills of oil, petroleum
products, substances listed under 40 CFR parts 110,117, and 302, and sanitary
and septic wastes shall be contained and cleaned up immediately.
CV Caitrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Spill Prevention and Control WM-4
November 2000 1 of 4
Spill Prevention and Control M.4
Limitations ••This BMP only applies to spills caused by the contractor.
••Procedures and practices presented in this BMP are general.Contractor
shall identify appropriate practices for the specific materials used or stored
on-site.
Standards and ••To the extent that it doesn't compromise clean up activities, spills shall be
imp Specifications covered and protected from storm water run-on during rainfall.
••Spills shall not be buried or washed with water.
• •Used clean up materials, contaminated materials, and recovered spill
material that is no longer suitable for the intended purpose shall be stored
and disposed of in conformance with the provisions in these special
de provisions.
11.1
• •Water used for cleaning and decontamination shall not be allowed to enter
storm drains or watercourses and shall be collected and disposed of in
accordance with BMP WM-10, "Liquid Waste Management".
• •Water overflow or minor water spillage shall be contained and shall not be
allowed to discharge into drainage facilities or watercourses.
• •Proper storage, clean-up and spill reporting instruction for hazardous
materials stored or used on the project site shall be posted at all times in an
open, conspicuous and accessible location.
• •Waste storage areas shall be kept clean, well organized and equipped with
ample clean-up supplies as appropriate for the materials being stored.
Perimeter controls, containment structures, covers and liners shall be
repaired or replaced as needed to maintain proper function.
Education
• •Educate employees and subcontractors on what a "significant spill" is for
ewe'each material they use, and what is the appropriate response for
"significant" and "insignificant" spills.
• •Educate employees and subcontractors on potential dangers to humans and
the environment front spills and leaks.
••Hold regular meetings to discuss and reinforce appropriate disposal
procedures (incorporate into regular safety meetings).
• •Establish a continuing education program to indoctrinate new employees.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Spill Prevention and Control WM-4
November 2000 2 of 4
Spill Prevention and Control
• •The Contractor's Water Pollution Control Manager (WPCM) shall oversee
and enforce proper spill prevention and control measures.
Clean up and Storage Procedures
• •Minor Spills
-Minor spills typically involve small quantities of oil, gasoline, paint,
ma,etc.which can be controlled by the first responder at the discovery of
the spill.
-Use absorbent materials on small spills rather than hosing down Ior
burying the spill.
-Remove the absorbent materials promptly and dispose of properly.
-The practice commonly followed for a minor spill is:
1.Contain the spread ofthe spill.
2.Recover spilled materials.
3.Clean the contaminated area and/or properly dispose of
contaminated materials.
• •Semi-Significant Spills
-Semi-significant spills still can be controlled by the first responder
along with the aid ofother personnel such as laborers and the foreman,$••••
etc.This response may require the cessation of all other activities.
1.1
-Clean up spills immediately:
1.Notify the project foreman immediately.The foreman shall notify
the Resident Engineer (RE).
2.Contain spread of the spill.
3.If the spill occurs on paved or impermeable surfaces, clean up
using "dry"methods (absorbent materials, cat litter and/or rags).
Contain the spill by encircling with absorbent materials and do not
let the spill spread widely.
4.If the spill occurs in dirt areas,immediately contain the spill by
constructing an earthen dike.Dig up and properly dispose of
contaminated soil.
5.If the spill occurs during rain, cover spill with tarps or other
material to prevent contaminating runoff.
Cirtr.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Spill Prevention and Control WM-4
November 2000 3 of 4
Spill Prevention and Control;it.*
xit
,11111 Significant/Hazardous Spills
4.
-For significant or hazardous spills that cannot be controlled by
personnel in the immediate vicinity, the following steps shall be taken:
qp,1.Notify the RE immediately and follow up with a written report.
wrr
2.Notify the local emergency response by dialing 911.In addition
mop to 911, the contractor will notify the proper county officials.It is
the contractor's responsibility to have all emergency phone
numbers at the construction site.
3.Notify the Governor's Office of Emergency Services Warning
Center, (805) 852-7550.
401 4.For spills of federal reportable quantities, in conformance with the
killi requirements in 40 CFR parts 110,119, and 302, the contractor
shall notify the National Response Center at (800) 424-8802.
5.Notification shall first be made by telephone and followed up with
a written report.
6.The services of a spills contractor or a Haz-Mat team shall be
eel obtained immediately.Construction personnel shall not attempt to
clean up until the appropriate and qualified staff have arrived at
thejob site.
7.Other agencies which may need to be consulted include, but are
not limited to, the Fire Department, the Public Works Department,
Ofnitt the Coast Guard, the Highway Patrol, the City/County Police
Department, Department of Toxic Substances, California Division
of Oil and Gas, Cal/OSHA, etc.
Maintenance and ••Verify weekly that spill control clean up materials are located near material
Inspection storage, unloading, and use areas.
• •Update spill prevention and control plans and stock appropriate clean-up
materials whenever changes occur in the types of chemicals on site.
4al*
WO*
WI*
nova
44sdio
•••,'
Wfai
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Spill Prevention and Control WM-4
November 2000 4 of 4
-111
Solid Waste Management
MitO
pow 411•`
••
SWM
sss
so
Reg
q,ti ;,./B MP Objectives
--s •Soil Stabilization
•woo 4 .`.*.
1
•t c.'.r
•Sediment Control
*do .blr.—Z11116-Pt°r ,•Tracking Control
•Wind Erosion Control
*44'•Non-Storm Water Management
44"
•Materials and Waste Management
=,'
Definition and These are procedures and practices to minimize or eliminate the discharge of
Purpose pollutants to the drainage system or to watercourses as a result ofthe creation,
stockpiling, and removal of construction site wastes.
Appropriate Solid waste management practices are implemented on all construction projects
Applications that generate solid wastes.
Solid wastes include but are not limited to:
••Construction wastes including brick, mortar, timber, steel and metal scraps,
pipe and electrical cuttings, non-hazardous equipment parts, styrofoam and
rhl
other materials used to transport and package construction materials.
••Highway planting wastes, including vegetative material, plant containers,
and packaging materials.
MENI
••Litter, including food containers, beverage cans, coffee cups, paper bags,
plastic wrappers, and smoking materials, including litter generated by the
public.
Limitations Temporary stockpiling ofcertain construction wastes may not necessitate
stringent drainage related controls during the non-rainy season or in desert areas
with low rainfall.
Standards and Education
Specifications ••The Contractor's Water Pollution Control Manager (WPCM) shall oversee
and enforce proper solid waste procedures and practices.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Solid Waste Management WM-5
November 2000
1 of 3
Solid Waste Management
• •Instruct employees and subcontractors on identification of solid waste and
4417 hazardous waste.
• •Educate employees and subcontractors on solid waste storage and disposal
.1111 procedures.
••Hold regular meetings to discuss and reinforce disposal procedures
(incorporate into regular safety meetings).
me • •Require that employees and subcontractors follow solid waste handling and
storage procedures.
• •Prohibit littering by employees, subcontractors, and visitors.
• •Wherever possible, minimize production of solid waste materials.
1
11111;Collection, Storage, and Disposal
• •Littering on the project site shall be prohibited.
• •To prevent clogging of the storm drainage system litter and debris removal
;from drainage grates, trash racks, and ditch lines shall be a priority.
ale ••Trash receptacles shall be provided in the Contractor's yard, field trailer
areas, and at locations where workers congregate for lunch and break
periods.
W.
• •Litter from work areas within the construction limits ofthe project site shall
be collected and placed in water tight dumpsters at least weekly regardless
ofwhether the litter was generated by the Contractor, the public, or others.
Collected litter and debris shall not be placed in dr next to drain inlets,
•010 )storm water drainage systems or watercourses.
• •Dumpsters of sufficient size and number shall be provided to contain the
solid waste generated by the project.
••Full dumpsters shall be removed from the project site and the contents shall
be disposed of outside the highway right of way in conformance with the
provisions in Section 7-1.13 of the Standard Specifications.
••Litter stored in collection areas and containers shall be handled and
disposed of by trash hauling contractors.
• •Materials that are disposed ofor temporarily stockpiled outside the highway
right-of-way but are visible from the Highway, shall be in a neat and
*AO orderly fashion to the satisfaction of the Resident Engineer (RE).
••Storm water run-on shall be prevented from contacting stored solid waste
through the use of berms, dikes, or other temporary diversion structures or
Caltrans Storm Water Quality HandbookslbrConstruction Site Best Management Practices Manual Solid Waste Management WM-5
Akoi November 2000 2 of 3
Solid Waste Management i/11M-5
through the use ofmeasures to elevate waste form site surfaces.
• •Solid waste storage areas shall be located at least 15m from drainage
facilities and watercourses and shall not be located in areas prone to
flooding or ponding.
• •Except during fair weather, construction and highway planting waste not
stored in watertight dumpsters shall be protected from wind and rain by
securely covering the waste with tarps or plastic sheeting or protected in
conformance with the applicable Disturbed Soil Area protection.
• •Dumpster washout on the project site is not allowed.
114 ••Notify trash hauling contractors that only watertight dumpsters are
acceptable for use on-site.
• •Plan for additional containers during the demolition phase of construction.
• •Plan for more frequent pickup during the demolition phase of construction.
• •Designate on-site waste storage areas and obtain approval ofthe RE.
• •Segregate potentially hazardous waste from non-hazardous construction site
waste.
• •Make sure that toxic liquid wastes (used oils, solvents, and paints) and
chemicals (acids, pesticides, additives, curing compounds) are not disposed
of in dumpsters designated for construction debris.
• •Dispose ofnon-hazardous waste in accordance with Standard Specification
7-1.13, Disposal of Material Outside the Highway right-of-way.
• •For disposal ofhazardous waste,see BMP WM-6, "Hazardous Waste
Management".Have hazardous waste hauled to an appropriate disposal
and/or recycling facility.
• •Salvage or recycle useful vegetation debris, packaging and/or surplus
building materials when practical.For example, trees and shrubs from land
clearing can be used as a brush barrier, or converted into wood chips, then
used as mulch on graded areas.Wood pallets, cardboard boxes, and
construction scraps can also be recycled.
Maintenance and • •The WPCM shall monitor on-site solid waste storage and disposal
Inspection procedures.
••Police site for litter and debris.
4.•r*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Solid Waste Management WM-5
November 2000 3 of 3
OW
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Definition and These are procedures and practices to minimize or eliminate the discharge of
Purpose pollutants from construction site hazardous waste to the storm drain system or to
watercourses.
h.Appropriate ••This best management practice (BMP) applies to all construction projects..Applications ••Hazardous waste management practices are implemented on construction
41.•projects that generate waste from the use of:
-Petroleum Products,-Asphalt Products,
—...'-Concrete Curing Compounds,-Pesticides,
11
-Palliatives,-Acids,
.-Septic Wastes,-Paints,
--,-Stains,-Solvents,
....-Wood Preservatives,-Roofing Tar, or
,..;-Any materials deemed a hazardous waste in California, Title 22
ay
Division 4.5, or listed in 40 CFR Parts 110, 117, 261, or 302.
—Limitations ••Nothing in this BMP relieves the Contractor from responsibility for
compliance with federal, state, and local laws regarding storage, handling,
.....transportation, and disposal ofhazardous wastes.
••This BMP does not cover aerially deposited lead (ADL) soils.For ADL
..._soils refer to BMP WM-7, Contaminated Soil Management, and the project
Special Provisions.
°
Erf*
Caitrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual
Hazardous Waste Management WM-6
1
.c.......__November 2000
of 5
Hazardous Waste Management
wee
Standards and Education
Specifications • •Educate employees and subcontractors on hazardous waste storage and
gill disposal procedures.
• •Educate employees and subcontractors on potential dangers to humans and
fill the environment from hazardous wastes.
• •Instruct employees and subcontractors on safety procedures for common
construction site hazardous wastes.
Oft • •Instruct employees and subcontractors in identification of hazardous and
solid waste.
• •Hold regular meetings to discuss and reinforce hazardous waste
Sri management procedures (incorporate into regular safety meetings).
• •The Contractor's Water Pollution Control Manager (WPCM) shall oversee
and enforce proper hazardous waste management procedures and practices.
• •Make sure that hazardous waste is collected, removed, and disposed of only
at authorized disposal areas.
Storage Procedures
• •Wastes shall be stored in sealed containers constructed of a suitable
bed material and shall be labeled as required by Title 22 CCR, Division 4.5 and
49 CFR Parts 172,173, 178, and 179.
• •All hazardous waste shall be stored, transported, and disposed as required in
Title 22 CCR, Division 4.5 and 49 CFR 261-263.
lika*••Waste containers shall be stored in temporary containment facilities that
shall comply with the following requirements:
.*".4
-Temporary containment facility shall provide a spill containment
volume equal to 1.5 times the volume of all containers.
-Temporary containment facility shall be impervious to the materials
all contained for a minimum contact time of72 hours.
-Temporary containment facilities shall be maintained free of
accumulated rainwater and spills.
-Sufficient separation shall be provided between stored containers to
allow for spill cleanup and emergency response access.
-Incompatible materials,such as chlorine and ammonia, shall not be
stored in the same temporary containment facility.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Hazardous Waste Management WM-6
.wr /baits November 2000 2 of 5
Hazardous Waste Management WM-6
kau ••Throughout the rainy season, temporary containment facilities shall be
covered during non-working days, prior to rain events.
• •Drums shall not be overfilled and wastes shall not be mixed.
••Paint brushes and equipment for water and oil based paints shall be cleaned
within a contained area and shall not be allowed to contaminate site soils,
11111.watercourses or drainage systems.Waste paints, thinners, solvents,
residues, and sludges that cannot be recycled or reused shall be disposed of
as hazardous waste.When thoroughly dry, latex paint and paint cans, used
rati brushes, rags, absorbent materials, and drop cloths shall be disposed of as
solid waste.
• •Ensure that adequate hazardous waste storage volume is available.
••Ensure that hazardous waste collection containers are conveniently located.
••Designate hazardous waste storage areas on site away from storm drains or
watercourses and away from moving vehicles and equipment to prevent
wig accidental spills.
• •Minimize production or generation ofhazardous materials and hazardous
waste on the job site.
• •Use containment berms in fueling and maintenance areas and where the
potential for spills is high.
• •Segregate potentially hazardous waste from non-hazardous construction site
debris.
• •Keep liquid or semi-liquid hazardous waste in appropriate containers
(closed drums or similar) and under cover.yr*
Aldif • •Clearly label all hazardous waste containers with the waste being stored and
the date of accumulation.
MO'• •Place hazardous waste containers in secondary containment.
••Do not allow potentially hazardous waste materials to accumulate on the
ground.
••Unless watertight, containers of dry waste shall be stored on pallets.
• •Do not mix wastes.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Hazardous Waste Management WM-5
November 2000 3 of 5
Hazardous Waste Management WB/1-6
Disposal Procedures
••Waste shall be disposed of outside the highway right-of-way within 90 days
ofbeing generated, or as directed by the Resident Engineer (RE).
••To minimize on-site storage,full containers ofwaste shall be disposed of
outside the highway right-of-way at least weekly. In no case shall hazardous
waste storage exceed requirements in Title 22 CCR, section 66262.34.
go • •Waste shall be disposed ofby a licensed hazardous waste transporter at an
authorized and licensed disposal facility or recycling facility utilizing
properly completed Uniform Waste Manifest forms.In no case shall
410 hazardous waste storage exceed requirements in Title 22 CCR, section
66262.34.
Hig I ••A Caltrans certified laboratory shall sample waste to determine the
appropriate disposal facility.
••Make sure that toxic liquid wastes (used oils, solvents, and paints) andier
chemicals (acids, pesticides, additives, curing compounds) are not disposed
of in dumpsters designated for solid waste construction debris.
••Properly dispose of rainwater in secondary containment that may have
mixed with hazardous waste.
• •Recycle any useful material such as used oil or water-based paint when
•-
1
practical.
1
• •Attention is directed to "Hazardous Material", "Contaminated Material",
and "Aerially Deposited Lead" of the contract documents regarding the
handling and disposal of hazardous materials.
om•
Maintenance and • •The WPCM shall monitor on-site hazardous waste storage and disposal
Inspection procedures.
••Waste storage areas shall be kept clean,well organized, and equipped with
—•ample clean-up supplies as appropriate for the materials being stored.
• •Storage areas shall be inspected in conformance with the provisions in the
contract documents.
• •Perimeter controls, containment structures, covers, and liners shall be
repaired or replaced as needed to maintain proper function.
.10J ••Hazardous spills shall be cleaned up and reported in conformance with the
applicable Material Safety Data Sheet (MSDS) and the instructions posted
at the project site.
4C1*
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Hazardous Waste Management WM-6
0./.„„...November 2000 4 of 5
Hazardous Waste Management
11/1/M
-6
••The National Response Center, at (800) 424-8802, shall be notified of spills
SI ofFederal reportable quantities in conformance with the requirements in 40
CFR parts 110, 117, and 302.,04
••Copy of Bill of Laden and disposal receipts shall be provided to the RE.
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r*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Hazardous Waste Management WM-6
rr November 2000 5 of 5aileraers
Contaminated Soil Management
-4
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/•.••••°BMP Objectives•Soil Stabilization
r •Sediment Control•Tracking Control
.4;i:-S •Wind Erosion Control•Non-Storm Water Management•Materials and Waste Management
Definition and These are procedures and practices to minimize or eliminate the discharges ofPurposepollutants to the drainage system or to watercourses from contaminated soil.
Appropriate ••
Contaminated soil management is implemented on construction projects inApplicationshighly urbanized or industrial areas where soil contamination may have
occurred due to spills,illicit discharges, and leaks from underground
storage tanks.
• •It may also apply to highway widening projects in older areas where median
and shoulder soils may have been contaminated by aerially deposited lead(ADL).
Limitations ••
The procedures and practices presented in this best management practice
(BMP) are general.The contractor shall identify appropriate practices and
procedures for the specific contaminants known to exist or discovered on
site.
Standards and Identifying Contaminated Areas
Specifications • •Contaminated soils are often identified during project planning and
development with known locations identified in the plans and
specifications.The contractor shall review applicable reports and
investigate appropriate call-outs in the plans and specifications.
••
The contractor may further identify contaminated soils by investigating:
-Past site uses and activities.
-Detected or undetected spills and leaks.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Contaminated Soil Management WM-7November 2000 1 r iA
Contaminated Soil, Management [INM-7
-Acid or alkaline solutions from exposed soil or rock formations high in
acid or alkaline forming elements.
-Look for contaminated soil as evidenced by discoloration, odors,
differences in soil properties, abandoned underground tanks or pipes,
or buried debris.Test suspected soils at a certified laboratory.
iS
Education
• •Prior to performing any excavation work at the locations containing
material classified as hazardous, employees and subcontractors shall
complete a safety training program which meets 29 CFR 1910.120 and 8
CCR 5192 covering the potential hazards as identified.
••Educate employees and subcontractors in identification of contaminated soil
and on contaminated soil handling and disposal procedures.
• •Hold regular meetings to discuss and reinforce disposal procedures
(incorporate into regular safety meetings).
Handling Procedures for Material with Aerially Deposited Lead (ADL)
••Materials from areas designated as containing (ADL) may,if allowed by the
contract special provisions, be excavated, transported, and used in the
construction of embankments and/or backfill.
••Excavation, transportation, and placement operations shall result in no
visible dust.
big • •Use caution to prevent spillage of lead containing material during transport.
••••Monitor the air quality during excavation of soils contaminated with lead.
Handling Procedures for Contaminated Soils
b-„.„
••Test suspected soils at a Caltrans approved certified laboratory.
11.1
••If the soil is contaminated, work with the local regulatory agencies to
develop options for treatment and/or disposal.4.0
• •Avoid temporary stockpiling ofcontaminated soils or hazardous material.
0w'• •If temporary stockpiling is necessary:
(1)Cover the stockpile with plastic sheeting or tarps.
(2)Install a berm around the stockpile to prevent runoff from leaving the
area.
E*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Contaminated Soil Management WM-7
November 2000 2 of 4
Contaminated Soil Management
(3)Do not stockpile in or near storm drains or watercourses.
••Contaminated material and hazardous material on exteriors of transport
vehicles shall be removed and placed either into the current transport
•vehicle or the excavation prior to the vehicle leaving the exclusion zone.
• •Monitor the air quality continuously during excavation operations at all
locations containing hazardous material.
irk • •Procure all permits and licenses, pay all charges and fees, and give all
notices necessary and incident to the due and lawful prosecution of the
sal work, including registration for transporting vehicles carrying the
contaminated material and the hazardous material.
• •Collect water from decontamination procedures and treat and/or dispose of
Mit it at an appropriate disposal site.
3 ••Collect non-reusable protective equipment, once used by any personnel, and
dispose of at an appropriate disposal site.
• •Install temporary security fence to surround and secure the exclusion zone.
Remove fencing when no longer needed.
• •Excavation, transport, and disposal ofcontaminated material and hazardous
material shall be in accordance with the rules and regulations of the
following agencies (the specifications ofthese agencies supersede the
procedures outlined in this BMP):
-United States Department of Transportation (USDOT);
-United States Environmental Protection Agency (USEPA);
-California Environmental Protection Agency (CAL-EPA);
-California Division of Occupation Safety and Health Administration
(CAL-OSHA); and
-Local regulatory agencies.
Procedures for Underground Storage Tank Removals
••Prior to commencing tank removal operations, obtain the required
underground storage tank removal permits and approval from the federal,
state, and local agencies which have jurisdiction over such work.
• •Arrange to have tested,as directed by the Resident Engineer (RE), any
liquid or sludge found in the underground tank prior to its removal to
determine if it contains hazardous substances.
Cribr
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Contaminated Soil Management WM-7
November 2000 3 of 4
Contaminated Soil Management
w.
••Following the tank removal, take soil samples beneath the excavated tank
and perform analysis as required by the local agency representative(s).
4111 • •The underground storage tank, any liquid and/or sludge found within the
tank, and all contaminated substances and hazardous substances removed
during the tank removal shall be transported to disposal facilities permitted
dio
to accept such waste.
Water Control
••Take all necessary precautions and preventive measures to prevent the flow
ofwater, including ground water, from mixing with hazardous substances
or underground storage tank excavations.Such preventative measures may
consist of, but are not limited to: berms, cofferdams, grout curtains, freeze
walls, and seal course concrete or any combination thereof.
• •If water does enter an excavation and becomes contaminated, such water,
3 when necessary to proceed with the work, shall be discharged to clean,
closed top, watertight holding tanks, treated, and disposed of in accordance
with federal, state, and local laws.
Maintenance and • •The Contractor's Water Pollution Control Manager and/or construction
Inspection supervisor shall monitor on-site contaminated soil storage and disposal
procedures.
• •Monitor air quality continuously during excavation operations at all
locations containing hazardous material.
• •Coordinate contaminated soils and hazardous substances/waste
management with the appropriate federal, state, and local agencies.
040
••Inspect hazardous waste receptacles and areas regularly.
WIN
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gar Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Contaminated Soil Management WM-7
November 2000 4 of 4
Concrete Waste Management -
1A1M-81
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CONCRETE .p-,WASHOUT
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f$.•Non-Storm Water Management::'•Materials and Waste Management
.111.•V
Definition and These are procedures and practices that are implemented to minimize or eliminatePurposethe discharge of concrete waste materials to the storm drain system or to
watercourses.
Appropriate ••Concrete waste management practices are implemented on constructionApplicationsprojects where concrete is used as a construction material or where concrete
dust and debris result form demolition activities.
••Where slurries containing portland cement concrete (PCC) or asphalt
concrete (AC) are generated, such as from sawcutting, coring, grinding,
grooving, and hydro-concrete demolition.
• •Where concrete trucks and other concrete-coated equipment are washed on
site, when approved by the Resident Engineer (RE).See also NS-8, Vehicle
and Equipment Cleaning.
...,••Where mortar-mixing stations exist.
Limitations None identified..„,
Standards and Education
Specifications
41.6 ••Educate employees, subcontractors, and suppliers on the concrete waste
management techniques described herein.
.._••The Contractor's Water Pollution Control Manager (WPCM) shall oversee
and enforce concrete waste management procedures.
,,...
.
CA*Caitrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Concrete Waste Management WM-8AidaNovember 2000
1 of 4
Concrete Waste Management liAIM-8
Concrete Slurry Wastes
••PCC and AC waste shall not be allowed to enter storm drains or
watercourses.
•d.• •PCC and AC waste shall be collected and disposed ofoutside the highway
de•right-of-way in conformance with section 7-1.13 ofStandard Specifications
or placed in a temporary concrete washout facility.
••Disposal of hardened PCC and AC waste shall be in conformance with
Section 15-3.02 of the Standard Specifications.
dwi • •A sign shall be installed adjacent to each temporary concrete washout
facility to inform concrete equipment operators to utilize the proper
facilities.
• •Below grade concrete washout facilities are typical.Above grade facilities
3
are used if excavation is not practical.
• •Do not allow slurry residue from wet coring or saw-cutting AC or PCC to
enter storm drains or receiving waters by:
-Placing temporary berms or sandbags around coring or saw-cutting
locations to capture and contain slurry runoff.
-Placing straw bales, sandbags, or gravel dams around inlets to prevent
slurry from entering storm drains.
.• •Vacuum slurry residue and dispose in a temporary pit (as described in On-
Site Temporary Concrete Washout Facility, Concrete Transit Truck
Washout Procedures, below) and allow slurry to dry.Dispose ofdry slurry
residue in accordance with BMP WM-5, "Solid Waste Management", or,
for on-site disposal,in accordance with Standard Specification 15-3.02,
Removal Methods.
••Collect residue from grooving and grinding operations in accordance with
Standard Specifications Section 42-1.02 and 42-2.02, "Construction."
On-site Temporary Concrete Washout Facility, Transit Truck
Washout Procedures
••Temporary concrete washout facilities shall be located a minimum of 15 m
(50 ft) from storm drain inlets, open drainage facilities, and watercourses,
unless determined unfeasible by the RE.Each facility shall be located away
from construction traffic or access areas to prevent disturbance or tracking.
• •A sign shall be installed adjacent to each washout facility to inform concrete
equipment operators to utilize the proper facilities.The sign shall be
Eritr Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Concrete Waste Management WM-8
November 2000 2 of 4
.Concrete Waste Management IWM-8
..,
installed as shown on the plans and in conformance with the provisions in
Section 56-2, "Roadside Signs",ofthe Standard Specifications.
• •Temporary concrete washout facilities shall be constructed above grade or
"below grade at the option ofthe Contractor.Temporary concrete washout
AI facilities shall be constructed and maintained in sufficient quantity and size
to contain all liquid and concrete waste generated by washout operations.
Au
co • •Temporary washout facilities shall have a temporary pit or bermed areas of
sufficient volume to completely contain all liquid and waste concrete
materials generated during washout procedures.
•.Perform washout of concrete trucks in designated areas only.
1 ••Once concrete wastes are washed into the designated area and allowed to
ime harden, the concrete shall be broken up, removed, and disposed of per BMP
WM-5,"Solid Waste Management", and in conformance with the
3 provisions in Section 15-3.02, "Removal Methods",ofthe Standard
Specifications.Dispose ofhardened concrete on a regular basis.
moo ••Temporary Concrete Washout Facility (Type Above Grade)
.....,-Temporary concrete washout facility (type above grade) shall be
constructed as shown on the plans, with a recommended minimum
length and minimum width of3m, but with sufficient quantity and—volume to contain all liquid and concrete waste generated by washout
•operations.The length and width.ofa facility may be increased, at the
Contractor's expense, upon approval ofthe RE.
)
-Straw bales, wood stakes, and sandbag materials shall conform to the.-
provisions in BMP SC-9, "Straw Bale Barrier".
-Plastic lining material shall be a minimum of 60 mil polyethylene
sheeting and shall be freeof holes, tears or other defects that
...,compromise the impermeability ofthe material.
—-Portable delineators shall conform to the provisions in Section 12-3.04,
"Portable Delineators",ofthe Standard Specifications.The delineator
bases shall be cemented to the pavement in the same manner as
provided for cementing pavement markers to pavement in Section
--85-1.06, "Placement",ofthe Standard Specifications.Portable
delineators shall be applied only to a clean, dry surface.
—• •Temporary Concrete Washout Facility (Type Below Grade)
-Temporary concrete washout facility (type below grade) shall be
constructed as shown on the plans, with a recommended minimum
LIAlep.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Concrete Waste Management WM-8.0.November 2000 3 of 4MilynnAr
al*Concrete Waste Management
length and minimum width of 3m (10 ft).The quantity and volume
shall be sufficient to contain all liquid and concrete waste generatedby
washout operations.The length and width of a facility may be
increased, at the Contractor's expense, upon approval ofthe RE.Lath
and flagging shall be commercial type.
.11 Removal of Temporary Concrete Washout Facilities
• •When temporary concrete washout facilities are no longer required for the
work,as determined by the RE, the hardened concrete shall be removed and
disposed of in conformance with the provisions in Section 15-3.02 of the
1
Standard Specifications.Materials used to construct temporary concrete
washout facilities shall become the property ofthe Contractor, shall be
removed from the site ofthe work, and shall be disposed ofoutside the
.1 highway right-of-way in conformance with the provisions in Section 7-1.13
of the Standard Specifications.
• •Holes, depressions or other ground disturbance caused by the removal of the
temporary concrete washout facilities shall be backfilled and repaired in
conformance with the provisions in Section 15-1.02, "Preservation of
Property,"of the Standard Specifications.
Maintenance and • •The Contractor's Water Pollution Control Manager (WPCM) shall monitor
Inspection on site concrete waste storage and disposal procedures at least weekly.
• •The WPCM shall monitor concrete working tasks, such as saw cutting,
coring, grinding and grooving at least weekly to ensure proper methods are
employed.
• •Temporary concrete washout facilities shall be maintained to provide
adequate holding capacity with a minimum freeboard of 100mm for above
grade facilities and 300mm for below grade facilities.Maintaining
temporary concrete washout facilities shall include removing and disposing
ofhardened concrete and returning the facilities to a functional condition.
Hardened concrete materials shall be removed and disposed of in
conformance with the provisions in Section 15-3.02, "Removal Methods,"
of the Standard Specifications.
••Existing facilities must be cleaned, or new facilities must be constructed and
ready for use once the washout is 75% full.
1 OCaltrans
Storm Water Quality HandbooksfConstruction Site Best Management Practices Manual Concrete Waste Management WM-8
November 2000 4 of 4
ii111
Sanitary/Septic Waste Management 11NM-9
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4 BMP Objectives•Soil Stabilization•Sediment Control
awl •Tracking Control•Wind Erosion Control
•Non-Storm Water Management
-'•Materials and Waste Management
Definition and Procedures and practices to minimize or eliminate the discharge ofconstruction
Purpose site sanitary/septic waste materials to the storm drain system or to watercourses.
Appropriate Sanitary/septic waste management practices are implemented on all construction
Applications sites that use temporary or portable sanitary/septic waste systems.
Limitations Not applicable.
Standards and Education
Specifications • •Educate employees, subcontractors, and suppliers on sanitary/septic waste
storage and disposal procedures.%MO
• •Educate employees, subcontractors, and suppliers of potential dangers to
humans and the environment from sanitary/septic wastes.
••Instruct employees, subcontractors, and suppliers in identification of
sanitary/septic waste.
'WO • •Hold regular meetings to discuss and reinforce disposal procedures
(incorporate into regular safety meetings).
• •Establish a continuing education program to indoctrinate new employees.
Storage and Disposal Procedures
• •Temporary sanitary facilities shall be located away from drainage facilities,
watercourses, and from traffic circulation.When subjected to high winds or
risk of high winds, as determined by the Resident Engineer (RE), temporary
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Sanitary/Septic Waste Management WM-9
November 2000 1 of 2
Sanitary/Septic Waste Management
sanitary facilities shall be secured to prevent overturning.
••Wastewater shall not be discharged or buried within the highway
right-of-way.
•••Sanitary and septic systems that discharge directly into sanitary sewer
systems, where permissible, shall comply with the local health agency, city,
county, and sewer district requirements.
• •If using an on site disposal system, such as a septic system, comply with
local health agency requirements.
41 • •Properly connect temporary sanitary facilities that discharge to the sanitary
sewer system to avoid illicit discharges.
owl ••Ensure that sanitary/septic facilities are maintained in good working order
by a licensed service.
• •Use only reputable, licensed sanitary/septic waste haulers.
Maintenance and ••The Contractor's Water Pollution Control Manager (WPCM) shall monitor
41101 Inspection on site sanitary/septic waste storage and disposal procedures at least
weekly.
4•RI
*MI
.,+04 E*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Sanitary/Septic Waste Management WM-9
ioir•November 2000 2 of 2
Liquid Waste Managernent
,vonr.1.1
11.
IF 1
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1 1
4
BMP Objectives•Soil Stabilization
;1 •Sediment Control
,44 •Tracking Control•Wind Erosion Control
-,;„1 •Non-Storm Water Management
•Materials and Waste Management
Definition and Procedures and practices to prevent discharge ofpollutants to the storm drain
Purpose system or to watercourses as a result of the creation, collection, and disposal of
non-hazardous liquid wastes.
Appropriate Liquid waste management is applicable to construction projects that generate any
Applications of the following non-hazardous byproducts, residuals, or wastes, such as:
• •Drilling slurries and drilling fluids
• •Grease-free and oil-free wastewater and rinse water
••Dredgings
••Other non-storm water liquid discharges not permitted by separate permits.
Limitations ••Disposal of some liquid wastes may be subject to specific laws and
regulations, or to requirements ofother permits secured for the construction
project (e.g., National Pollutant Discharge Elimination System [NPDES]
permits, Army Corps permits, Coastal Commission permits, etc.).
••Does not apply to dewatering operations (see BMP NS-2 Dewatering
Operations"), solid waste management (see BMP WM-5, "Solid Waste
Management"), hazardous wastes (see BMP WM-6, "Hazardous Waste
Management"), or concrete slurry residue (see BMP WM-8, "Concrete
Waste Management").
••Does not apply to non-stormwater discharges permitted by any NPDES
permit held by the pertinent Caltrans District, unless the discharge is
determined by Caltrans to be a source of pollutants.Typical permitted non-
stormwater discharges can include: water line flushing; landscape irrigation;
Elf Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Liquid Waste Management WM-10
November 2000 1 of 4
Liquid Waste Management
diverted stream flows; rising ground waters; uncontaminated pumped
ground water; discharges from potable water sources; foundation drains;
irrigation water; springs; water from crawl space pumps; footing drains;
lawn watering; flows from riparian habitats and wetlands; and, discharges
or flows from emergency fire fighting activities.
Standards and General Practices
Specifications ••The Contractor's Water Pollution Control Manager (WPCM) shall oversee
and enforce proper liquid waste management procedures and practices.
• •Instruct employees and subcontractors how to safely differentiate between
non-hazardous liquid waste and potential or known hazardous liquid waste.
•••Instruct employees, subcontractors, and suppliers that it is unacceptable for
any liquid waste to enter any storm drainage device, waterway, or receiving
water.
•••Educate employees and subcontractors on liquid waste generating activities,
and liquid waste storage and disposal procedures.
• •Hold regular meetings to discuss and reinforce disposal procedures
(incorporate into regular safety meetings).
••Verify which non-stormwater discharges are permitted by the Caltrans
Statewide NPDES permit; different regions might have different
requirements not outlined in this permit.Some listed discharges may be
prohibited if Caltrans determines the discharge to be a source ofpollutants.
• •Apply the "Vehicle and Equipment Cleaning" best management practice
(BMP) for managing wash water and rinse water from vehicle and
equipment cleaning operations.
Containing Liquid Wastes
• •Drilling residue and drilling fluids shall not be allowed to enter storm drains
and watercourses and shall be disposed of outside the highway right-of-way
in conformance with the provisions in Section 7-1.13 of the Standard
Specifications.
• •If an appropriate location is available,as determined by the Resident
Engineer (RE),drilling residue and drilling fluids that are exempt under
CCR T23 • 2.511(g) may be dried by infiltration and evaporation in a
containment facility constructed in conformance with the provisions
concerning the Temporary Concrete Washout Facilities detailed in BMP
WM-08, "Concrete Waste Management"
fief Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Liquid Waste Management WM-10
Gerhivans November 2000 2 of 4
Liquid Waste Management iNM_1®
••Liquid wastes generated as part ofan operational procedure, such as water-
laden dredged material and drilling mud, shall be contained and not allowed
to flow into drainage channels or receiving waters prior to treatment.
• •Contain liquid wastes in a controlled area, such as a holding pit, sediment
basin,roll-offbin, or portable tank.
.AI
••Containment devices must be structurally sound and leak free.
••Containment devices must be of sufficient quantity or volume to completely
contain the liquid wastes generated.
• •Take precautions to avoid spills or accidental releases of contained liquid
wastes.Apply the education measures and spill response procedures
outlined in BMP WM-4,"Spill Prevention and Control".
• •Do not locate containment areas or devices where accidental release ofthe
contained liquid can threaten health or safety, or discharge to water bodies,
channels, or storm drains.
Capturing Liquid Wastes
• •Capture all liquid wastes running off a surface which has the potential to
affect the storm drainage system, such as wash water and rinse water from
cleaning walls or pavement.
••Do not allow liquid wastes to flow or discharge uncontrolled.Use
temporary dikes or berms to intercept flows and direct them to a
containment area or device for capture.
• •If the liquid waste is sediment laden, use a sediment trap (see BMP SC-3,
"Sediment Trap")for capturing and treating the liquid waste stream, or40F.capture in a containment device and allow sediment to settle.
Disposing of Liquid Wastes
••Typical method is to dewater the contained liquid waste, using procedures
such as described in BMP NS-2, "Dewatering Operations", and BMP SC-2,
"Desilting Basin"; and dispose of resulting solids per BMP WM-5,"Solid
Waste Management", or per Standard Specifications Section 7-1.13,
"Disposal ofMaterial Outside the Highway Right-of-Way", for off-site
disposal.
••Method of disposal for some liquid wastes may be prescribed in Water
Quality Reports, NPDES permits, Environmental Impact Reports, 401 or
404 permits, local agency discharge permits, etc., and may be defined
elsewhere in the Special Provisions.
Et.Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Liquid Waste Management WM-10
November 2000 3 of 4
Liquid Waste Management liA1M-10
••Liquid wastes, such as from dredged material, may require testing and
certification whether it is hazardous or not before a disposal method can be
determined.
• •For disposal ofhazardous waste,see BMP WM-6, "Hazardous Waste
Management".
••If necessary, further treat liquid wastes prior to disposal.Treatment may
include, though is not limited to, sedimentation, filtration, and chemical
40111
neutralization.
oft
Maintenance and • •Spot check employees and subcontractors at least monthly throughout the
Inspection job to ensure appropriate practices are being employed.
• •Remove deposited solids in containment areas and capturing devices as
needed, and at the completion ofthe task.Dispose of any solids as
described in BMP WM-5, "Solid Waste Management".
• •Inspect containment areas and capturing devices frequently for damage, and
repair as needed.
dio
drr
w.
r*Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual Liquid Waste Management 1NM-10
November 2000 4 of 4
ATTACHMENT 5
J
_..,.,
BMP.:BIOFILTERS
Considerations
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GRASS As .4..........•..Environmental Side44ASvcr'•''N"'".46 JO ''',si`z`..10 c".////.01 •••:..^Z..Effects
.1 DESCRIPTION Targeted Constituents
,,,,i Makers are of two types:swale and strip.A swale is a vegetated channel that treats •Sediment
concentrated flow. A strip treats sheet flow and is placed parallel to the contributing
.,%.,surface.Q Nutrients
EXPERIENCE IN CALIFORNIA Q Heavy Metals
:11
No biofilmrs specifically designed to treat storm water have been located.However,Q Toxic Materials
instances of "biofilter by happenstance-exist in northern communities (Davis, Sacramento,
Turlock, Fresno) where storm water is discharged to a grassed area prior to an inlet or an Q Floatable Materials
infiltration area...,[Q Oxygen Demand-
i SELECTION CRITERIA
•Ing Substances
•Comparable performance to wet ponds and constructed wetlands.Q Oil & Grosso
.•Limited to treating a few acres.
•Availability of water during dry season.0 Bacteria & Viruses
..,to HLIM•ITATIONS !likAteantimavepact-•Poor performance has occurred but this appears to be due to poor design.0 Probable LAW or
.,&•May be limited to areas where summer irrigation is feasible.Unknown Impact
•Can be difficult to maintain sheet flow in strips.
7id
•Can be difficult to avoid channelization in swales.Implementation
•Cannot be placed on steep slope.Requirements
•Area required may make infeasible on industrial sites.
•Proper maintenance required to maintain health and density of vegetation.Q Capital Costs
Q O&M Costs:DESIGN AND SIZING CONSIDERATIONS Q Maintenance
-...•The surface area is defined by Figure 4A.0 Training•The minimum width for a swaleis determined by Mannings Equation.
400 •Minimum length of a strip is 10 feet.
•The longitudinal slope must not exceed 5%.
•Use a flow spreader and energy dissipater at the entrance of a swale.
ala
•High 0 Low•Good soils are important to achieve good vegetation cover..CONSTRUCTION/INSPECTION CONSIDERATIONS TC4
,...•Make sure soils are suitable for healthy vegetation.
•Level cross-section and even longitudinal slope for swales.
.-•Achieve sheet flow with strips.P.f0r-'t1--
/-eV
.....Best
Managemen
Practices.,_
Industrial Handbook 5 -33 March,1993
,
...•
Additional Information —Blofilters
A biofilter swale is a vegetated channel that looks similar to. but is wider than, a ditch that is sized only to transport
flow. The biofilter. swale must be wider to maintain low flow velocities and to keep the depth of the water below the
height of the vegetation up to a particular design event.A filter strip is placed along the edge ofthe pavement (its full
length if possible).The pavement grade must be such as to achieve sheet flow to the maximum extent practical along
,I the strip.
1 Vegetated biofl1ters will likely see limited application in industrial settings.Strips are most suitable for parking lots
which under this general permit do not require consideration unless they drain to a drainage system that also receives
flows from the industrial activities of concern.Within the industrial site itself conditions are usually not suitable for
locating a grassy area next to a paved area. Typically,the industrial area is paved to the property line.If the storm
water passes through a ditch prior to leaving the site itmay be possible to widen the ditch into a swale.
The performance ofbiofilters is probably somewhat less than wet ponds and constructed wetlands because the latter
provide treatment both during and between storms.Some =catchers have observed poor performance, recommending
their use only in combination with other treatment control BMPs. However. most field research on swale performance
has been conducted on grassed roadside ditches.A swab must be wider than a traditional roadside ditch, to avoid
ilig excessive flow velocities which topples the grass and causes channelization.
ori The swale bottom must be as level as possible; energy dissipation and a flow spreader should be placed at the entrance
to minimize diannelizadon.The pavement must be as level as possible along its boundary with a biofilter strip.The
pavement edge should be left clean that is. no curbs.Parking stall blocks must be open to pass the flow as unhindered
as possible.Use ofcurb cuts in curbs is not a satisfactory approach. The cuts channelize the water and can clog with
debris.The performance of strips may be compromised by the failure to achieve sheet flow at the interface between
the paved area and the strip.
Turfgrass is the preferred vegetation.Figure 4B shows recommendations for seven species of turf grass and one
ground cover plant for various areas of California (Youngner, et a1.,1962). More recent information in this regard is
also shown in Figure 4C (CCAE. 1984).Turfgrass will require summer irrigation to remain active.Although it has
not been tried it may be possible to allow the grass to become dormant during the summer since the biofilter is only in
service during the wet season.The biofilter could be irrigated beginning in October to bring it to a healthy condition
prior to the first storms.Ground cover species suitable for a non-irrigation situation may work but,it also has not been
tried.The soil must be of a fertility and porosity that allows for healthy vegetation.A porous soil also promotes
—1 infiltration.See the references that follow for Agricultural Extensive publications on efficient water use by turf
grasses.
If erosion of the swale is of concern because ofthe difficulty of maintaining a good grass cover, consider the use of
concrete grids (see Infiltration Systems) or similar material.Another concept is to use check dams to divide the swale
into a series of terraces, reducing the longitudinal slope to perhaps 1%, thereby reducing flow velocities.
Mg =
Several methods have been proposed to size biofilters (Homer. 1988; FHWA, 1989;1E11.1991;Tollnen et al.. 1976).
However. information on the relationship between biofilter area and performance is lacking for urban conditions.
Figure 4A uses the method of Homer (1988) with the 2-year storm as the design event, a slope of 3%, and a grass
height of 4 inches.A biofilter is sized to treat all storms up to a particular design event The design event can be
relatively small because the aggregate of all small events represents the majority of pollutant runoff.Research in
western Washington (Metro. 1992) found that a biofilter sized according to this technique removed 80 percent of the
suspended solids and attached pollutants and 50%of the soluble zinc,It was not able to remove dissolved phosphorus
.agg Of copper.
TC4
11114.41
heelless
.1111111=111114•1111Mmmo.MINNIMIL
Industrial Handbook 5 •34 March,1993
omm
Additional Information —Biofifters
Figure 4A is meant for guidance only and should be used with caution in areas where precipitation varies greatly
because of terrain.
The design engineer must determine the width of a swale using Manning's Equation and the 2-yearrainfall intensity(California,1976) appropriate to the site.An "n" of 0.20 is recommended (Metro, 1992). The design engineer must also
calculate the peak flow of the 100-year event to determine the depth of a swale.Since a width using an "n" of 0.20 is
generally wider than what is required of a grass lined channel, channel stability should not be of concern.It is generallynotnecessary to have a bypass for the extreme events because the minimum width specification combined with the
relatively gentle slope avoids excessive velocities.If erosion at extreme events is ofconcern, consider the above
concepts to minimize erosion.
The design engineer can make the swain wider than determined in the above step, with a corresponding shortening of thewalelength to obtain the same surface area.However, there is a practical limitation on how wide the swale can be andstillbe able to spread the flow across the swain width.Splitting the flow into multiple inlets and/or placing a flow
spreader near the storm inlet should be incorporated into the design.A concept that may work is to place a level 2"x
12" timber across the width ofthe male perhaps 10 feet from the pipe outlet Place gravel between the outlet and thetimber, to within 2 inches or so ofthe top ofthe timber.Place large rock immediately near the outlet to dissipate theflowenergy; the rock also may help distribute the flow.The timber will function like a weir.Flow spreaders have seen
limited application and their effect on performance has not been evaluated.r.
The problem of spreading the flow across the width of the wale may limit its use to tributary catchments of only a few
acres. The minimum width based on using Manning's Equation results in widths of3 to 12 feet per acre of impervious
tributary surface, depending on the location and longitudinal slope.
A minimum length of 10 feet is recommended for biofilter strips.Length here is defined as the measurement in the
direction of flow from the adjoining pavement.Lengths of 20 to 50 feet have been recommended by most practitioners
perhaps because ofthe concern that sheet flow cannot be maintained.Wherever room permits a length greater than 10
40 feet should be used.The short length is recommended in this handbook because space is at a premium at most existingindustrial sites:10 feet should work satisfactory if good sheet flow is maintained and no obstructions such as curbs are
placed along the pavement edge.
The type of strip discussed here is not to be confused with the natural vegetated buffer strip used in residential develop-ments to separate the housing from a stream or wetland.As the later type follows the natural contour flow
channelization is more likely and lengths of 75 to 150 feet are recommended.
The length of pavement prior to the strip should not exceed a few hundred feet to avoid channelization of large aggre-
r4
gates of runoff along the pavement before it reaches the pavement edge.To avoid channelization, care must be taken
during construction to make sure that the cross-section of the biofilter is level and that its longitudinal slope is even.
Channelization will reduce the effective area ofthe biofilter used for treatment and may erode the grass because ofexcessive velocities.
Maintenance
The facility should be checked annually for signs of erosion, vegetation loss, and channelization of the flow.The grassshould be mowed when it reaches a height of 6 inches.Allowing the grass to grow taller may cause it to thin andbecome less effective.The clippings should be removed.
TC4
Boot
Practkime
Industrial Handbook 5 -35 March,1993
Additional Information —Biofitters
REFERENCES
California (State of), 1976, "Rainfall Analysis for Drainage Design, Volume 3, Intensity-Duration-Frequency Curves".
Bulletin No. 195. Department of Water Resources.
California Cooperative Agricultural Extension (CCAE), 1984, "Selecting the Best Turf Grass".Leaflet 2589.
I
•
CCAE, 1985, "Turfgrass Water Conservation", Bulletin 21405.
1
CCAE, 1991, "Effluent Water for Turfgrass Irrigation", Bulletin 21500.
Federal Highway Administration (FHWA),1989, "Retention, Detention, and Overland Flow for Pollutant Removal of
Highway Stormwater Runoff (Draft)", Report No. FHWA/FtD-89/203.
Homer,ILL,1988,"Biofiltration Systems for Storm Runoff Water Quality Control", Washington State Department of
Ecology.
571 IE.P, 1991. "Vegetated Buffer Strip Designation Method Guidance Manual", Narragansett Bay Project.
Lager, J.A., W.G. Smith, and G. Tchobarioglous, 1977. "Catchbasin Technology Overview and
Assessment". USEPA 600/2-77-051.
Metropolitan Washington Council of Governments (MWCOG). March, 1992,"A Current Assessment ofUrban Best
Management Practice=Techniques for Reducing Nonpoint Source Pollution in the Coastal Zone".
Municipality ofMetropolitan Seattle, (Metro).1992,"Pollutant Removal Effectiveness ofa Designed Grassy Swale in
j•1 Mountlake Terrace, Washington (Draft)".
Sacramento County Cooperative Agricultural Extension, "Water Efficient Landscape Plants" by Pamela S. Bone,
Environmental Horticultural Notes.
Tollner, E.W., and BJ. Barfield., 1976. "Suspended Sediment Filtration Capacity of Simulated
Vegetation", Trans. American Society of Agricultural Engineers,19,678.
Youngner. V.B., J.H. Madison, M.H. Kimball, and W.B. Davis, 1962, "Climatic Zones for Turfgrass in California".
California Agriculture,16 (7), 2.
TC4
Brno
Industrial Handbook 5 -36 March,1993
1•••••••••
ATTACHMENT 6
4
Numeric Sizing
A bio-filter insert will be used to treat the storm water runoff,see following pages for
specifications.BIO CLEAN® Grate Inlet Skimmer Box (es), part number BC-GISB-15-
30-25 or approved equal,will be used in the trench drain at the parking entry to Building
No. 2.
This bio-filter has the capability of treating up to 18.5 cfs,per manufactures
specifications.The total site runoff is into the trench drain is approximately 3.5 cfs.
..0v)
Li
GAAccts\031060Numeric Sizing doe
Storm Water Standards
4/03/03
Table 3.Numeric Sizing Treatment Standards.
Volume
1.Volume-based BMPs shall be designed to mitigate (infiltrate, filter, or treat) the volume of runoff
produced from a 24-hour 85th percentile storm event,as determined from isopluvial maps
contained in the County of San Diego Hydrology Manual.
OR
Flow
2.Flow-based BMPs shall be designed to mitigate (infiltrate, filter, or treat) the maximum flow rate
of runoff produced from a rainfall intensity of 0.2 inch of rainfall per hour for each hour of a storm
event.
MHO
L Structural Treatment BMP Selection Procedure
Priority projects shall select a single or combination of treatment BMPs from the
categories in Table 4 that maximize pollutant removal for the particular pollutant(s) of
concern.A ny pollutants the p roject i s expected t o g enerate t hat a re a Iso causing a
Clean Water Act section 303(d) impairment of the downstream receiving waters of the
project should be given top priority in selecting treatment BMPs.
To select a structural treatment BMP using the Structural Treatment Control BMP
Selection Matrix (Table 4), each priority project shall compare the list of pollutants for
a which the downstream receiving waters are impaired (if any).According to the 1998 •
303(d) listing, the Agua Hedionda Lagoon is impaired for sediment and siltation.Buena
Vista Lagoon also has impaired beneficial uses (aquatic life)due to high
sedimentation/siltation. Portions of Carlsbad where construction sites have the potential
to d ischarge i nto a tributary of a 303(d) o r d irectl.y into a 3 03(d) w ater body o r sites
locatedwithin 200 feet of an ESA require additional BMP implementation.These water
bodies include the Pacific Ocean, Buena Vista Lagoon, Encinas Creek, Agua Hedionda
Lagoon, and Batiquitos Lagoon.
Priority projects that are not anticipated to generate a pollutant for which the receiving
water is Clean Water Act Section 303(d) impaired shall select a single or combination of
structural treatment BMPs from Table 4 that are effective for pollutant removal of the
identified pollutants of concern determined to be most significant for the project.
Selected BMPs must be effective for the widest range of pollutants of concern
anticipated to be generated by a priority project (as identified in Table 1).
Alternative storm water BMPs not identified in Table 4 may be approved at the
discretion of the City Engineer, provided the alternative BMP is as effective in removal
of pollutants of concern as other feasible BMPs listed in Table 4.
1
.
Storm Water Standards
4/03/03
Table 4. Structural Treatment Control BMP Selection Matrix.
Pollutant of Concern Treatment Control BMP Categories
Biofilters Detention Infiltration Wet Ponds or Drainage Filtration Hydrodynamic
Basins Basins(1)Wetlands Inserts Separator. Systems(2)
Sediment M H H H L H M
Nutrients L M M i M L M L
...,Heavy Metals M M M H L H L
•Organic Compounds U U U U L M L
,...Trash & Debris L H U U M H M
.4.14 Oxygen Demanding L M M M L M LSubstances
l!;:1 Bacteria U U H U L M L
Oil & Grease M M U U L H L
.,.#Pesticides U U U U L U L
(1) Including trenches and porous pavement.
(2) Also known as hydrodynamic devices and baffle boxes.
L:Low removal efficiency
M:Medium removal efficiency
H:High removal efficiency
U:Unknown removal efficiency •......
Sources: Guidance Specifying Management Measures for Sources ofNonpoint Pollution in Coastal Waters (1993), National
Stonnwater Best Management Practices Database (2001), and Guide for BMP Selection in Urban Developed Areas (2001).
ii.Restrictions on the Use of Infiltration Treatment BMPs
!31.Treatment control BMPs that are designed to primarily function as infiltration
—devices shall meet the following conditions (these conditions do not apply to
.. 1
treatment BMPs which allow incidental infiltration and are not designed to primarily
1
function as infiltration devices, such as grassy swales, detention basins, vegetated
—buffer strips,constructed wetlands,etc.):(1)urban runoff from commercial
developments shall undergo pretreatment to remove both physical and chemicalrcontaminants,such as sedimentation or filtration,prior to infiltration;(2)all dry
weather flows shall be diverted from infiltration devices except for those non-storm
-,1 water discharges authorized pursuant to 40 CFR 122.26(d)(2)(iv)(B)(1):d iverted
stream flows,rising ground waters,uncontaminated ground water infiltration [as
.,.,.defined at 40 CFR 35.2005(20)]to storm water conveyance systems,
.1.uncontaminated pumped ground water,foundation drains,springs,water from
crawl space pumps,footing drains,air conditioning condensation,flow from
—riparian habitats and wetlands, water line flushing, landscape irrigation,, discharges
from potable water sources other than water main breaks,irrigation water,
individual residential car washing, a nd d echiorinated swimming p ool discharges;..(3) pollution prevention and source control BMPs shall be implemented at a level
J..appropriate to protect groundwater quality at sites where infiltration structural
treatment BMPs are to be used;(4) the vertical distance from the base of any
—infiltration structural treatment BMP to the seasonal high groundwater mark shall
J..be at least 10 feet.Where groundwater does not support beneficial uses,this
vertical distance criterion may be reduced,provided groundwater quality is
1,
Storm Water Standards
4/03/03
maintained; (5) the soil through which infiltration is to occur shall have physical and
chemical characteristics that are adequate for proper infiltration durations and
treatment of urban runoff for the protection of groundwater beneficial uses; (6) the
horizontal distance between the base of any infiltration structural BMP and any
water supply wells shall be 100 feet or as determined appropriate by the City
Engineer.
32.Notification to neighboring jurisdictions may be required where staff determines
the infiltration BMP(s) may impact the groundwater in a neighboring jurisdiction.
Structural Treatment Limited Exclusions
(a.) Proposed restaurants,where the land area for development or redevelopment is
less than 5,000 square feet,are excluded from the numerical sizing criteria
--requirements listed in Table 3.
(b.) Where significant redevelopment results in an increase of less than 50 percent of
the impervious surfaces of a previously existing development,and the existing
development was not subject to priority project requirements, the numeric sizing criteria
apply only to the addition, and not to the entire development.
FLOW SPECIFICATIONS
I
_2 8 Description Percent Total Square Flow
i 1 of filter Open Square Inches Rate
Inchesof Total opening (Cubic
—1—sc...per Unit Unobstructed Feet perDimensionsOpeningsSecond)
7
)1 4i .f.:i:Iiii:::iiiiiiiiiiitffiniiiiNiiiiii
Skimmer
protected 100%186.4 186.4 6.6 cfsiii::e By-Pass
I i
Coarse screen
3lless/4n1 steel
x 1-314°62%165.3 102.5 4.4 cfs—I sta
flattened expanded
'1
TOP VIEW Medium Screen
10x10 mesh 56%165.3 92.5 4.6 cfsstainless steel.,.j ...
Fine screen
.,,,,ii FLOW SCHEMATIC 14x16 mesh 68%246.1 167.4 9.5 cfs
I stainless steel
—I STORM BOOM MAXIMUM THROAT FLOW RATE SCREEN TREATED FLOW RATE
1 •
SKIMMER III Total:0.54 cfs Total:18.5 cfs
41:
411
FLOW RATES BASED ON UNOBSTRUCTED SCREEN OPENINGS
ell %i
do -THROAT III%g GRATE 7-11AMMV ....,
...---Th
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TURBULENCE '111111.DEFLECTOR 1
.skiir eq.••.......%...cp.'..'4 .
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2 5 t,*:!:t:t:..:t.:...t..„:„..........*:!.3.*:.t.:t.al...:.:.:.:.:....„..COARSE SCREEN
.4 .•—1""I 8°-1..
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•
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............-.......::.-........-....................2.-....:....:•:•.-:.:-:%.:.:.:-.-:.:•:.....-:•:-:•:•f:•:-.•:.:.:-:::....f........................................„.....„.......--........•FINE SCREEN..............................................•CONCRETE STRUCTURE
.............................................................
BOX MANUFACTURED FROM
r MARINE GRADE FIBERGLASS & GEL MOUNT TO WALL BELOW
I COATED FOR UV PROTECTION GRATE WITH MOUNTINGKITCONSISTINGOF ALUMINUM
5 YEAR MANUFACTURERS WARRANTY ANGLES, TAPCONS, AND DRILL BITS
....,MOUNTING KITPATENTEDSOLD SEPARATELY
ALL FILTER SCREENS ARE STAINLESS STEEL
,.,
...,BIO CLEAN A BIPOBo SEAN69
ENVIRONMENTAL SERVICES.INC.Oceanside, CA 92049
,Office: (760) 433-7640AllDimensionsorein
GRATE INLET SKIMMER BOX inches.unless Fax: (760) 433-3176
otherwise noted.gkent@biocleanenironmentaLnet
1 Part #BC-GISB-15-30-25 Scale:www.blocleanenvironmentaLnetnone
O'Day Consultants Inc.
2710 Loker Avenue West,Suite 100
Carlsbad,CA 92008
Tel:(760)931-7700 Fax:(760)931 -8680
************
******
******
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******
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111
"11 Triangular Channel
Flowrate 0.097 CFS
Velocity 0.311 fps
Depth of Flow 0.401 feet
Critical Depth 0.171 feet
Freeboard 0.000 feet
Total Depth 0.401 feet
Width at Water Surface 1.603 feet
Top Width 1.603 feet
10 Slope of Channel 2.700 %
Left Side Slope 2.000 :1
Right Side Slope 2.000 :1
X-Sectional Area 0.321 sq.ft.rzuj Wetted Perimeter 1.792 feet
AR^(2/3)0.102
Mannings 'n'0.250
O'Day Consultants Inc..
2710 Loker Avenue West,Suite 100 .
4 Carlsbad,CA 92008
Tel:(760)931-7700 Fax:(760)931-8680 .
if
************
******..11
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******
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.Triangular Channel
AiII
Flowrate 0.154 CFS
Velocity 0.332 fps....Depth of Flow 0.477 feet
ma Critical Depth 0.206 feet
Freeboard 0.000 feet-•Total Depth 0.477 feet
Width at Water Surface 1.908 feet
Top Width 1.908 feet
All
Slope of Channel 2.450 %
Left Side Slope 2.000 :1
Right Side Slope 2.000 :1
.1
X-Sectional Area 0.455 sq.ft.
Wetted Perimeter 2.133 feet
AR^(2/3)0.1624.0
Mannings 'n'0.250
,..
i.444
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40
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.-_
_---
O'Day Consultants Inc..
2710 Loker Avenue West,Suite 100 .
Carlsbad,CA 92008 .
Tel:(760)931-7700 Fax:(760)931 -8680 .
,,,4
,************
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,441
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Aig
,,,
Ai'Flowrate 0.065 CFS
-Velocity 0.196 fps
Depth of Flow 0.420 feet
...Critical Depth 0.146 feet
Freeboard 0.000 feet
''''.Total Depth 0.420 feet
Width at Water Surface 1.679 feet
Top Width 1.679 feet
ME Slope of Channel 1.000 %
Left Side Slope 2.000 :1
mw Right Side Slope 2.000 :1
X-Sectional Area 0.352 sq.ft.
.
-...Wetted Perimeter 1.877 feet
AR^(2/3)0.116ow.Mannings 'n'0.250
.4.1
.....
1
_______.........—
.O'Day Consultants Inc..
.2710 Loker Avenue West,Suite 100 .
..Carlsbad,CA 92008 .
.Tel:(760)931 -7700 Fax:(760)931-8680 .
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.04.1 ***I<(2.25')>1
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0..0AAA.w.s.(0.56.)^.....
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41C ******
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Triangular Channel
...
*#,
Flowrate 0.269 CFS
Velocity 0.428 fps
Depth of Flow 0.563 feet
Critical Depth 0.257 feet
Freeboard 0.000 feet
Total Depth 0.563 feet
Width at Water Surface 2.251 feet
Top Width 2.251 feet
3 Slope of Channel 3.250 %
Left Side Slope 2.000 :1
Right Side Slope 2.000 :1
--X-Sectional Area 0.633 sq.ft.
Wetted Perimeter 2.517 feet
.0 AR^(2/3)0.252
Mannings 'n'0.250
--,
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ATTACHMENT 7
,
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1 .
Grate Inlet Skimmer Box
For Grated Inlets
.Special
Stormwater _..t.., .44.--44.,,.444'4-
.41
41 Application
.Hydrocarbon ..4
Absorption...
Boom
Multi-stage Filtration _
.
E Captures Everything .
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Aat From Hydrocarbons,s; ..-.04...
,-,,-,„1 .. rTo Sediment, To Grass ..i;,.....,.,...
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Clippings,To Human
,),:::',.,'..4.i 1%Trash...Everything!..„....‘.,.!„
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4.Will Not .
1...t
.
,,Impede The .
_.Designed Flow
+,..Of The Inlet
The Grate Inlet Skimmer Box is made of custom Sizes...
durable fiberglass, with stainless steel filter No Problemscreensbackedbyheavydutyaluminum
grating.Suntree Technologies has the
ability to make custom shaped units to .,
....accommodate any unique retrofit .....'.4'
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.„-.,...,_Phone (321) 799-0001 Fax (321) 799-1245
'.4'''4'.'1-',N*1..frr4;:itak '5*—;•1•4'':•,;,%•'--..www.suntreetech.com happel@suntreetech.com
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For Grated Or Non-Grated Curb Inlets
Utilizing filtration screens of e ..4 so.lempt.vorso.....'
filldifferentsievesizesoptimizesthe..,.
,ifaigargr .water flow and the potential for -....--
.-........-:.„A \,,.....;-1 \• •,capturing debris.If the unit becomes
full of debris,the water flow can '
....Eip,.,..„...,-....i..,,iltd.„„..bypass the filtration process......th 4....!t.n .r,.,01.;i'....4 t 'itt/t A,'‘
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-4'Left: View of the Grate Inlet Skimmer Box....e.-.c.....,4 ,‘,4 ':•,,,,..r with flume,completely installed and ready„,...
...,.
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ji h1 t`yr.:1 r)f,,:t4r..1.74''.,,,, i;-'.„4.for the grate to be placed back.r,`r.critir.i-r Ffiritii •.''''''.,
1 t ..,,.,......6
a .e Models are available for all standard.'ii;Aftt;,1\.. .
,..,
C:.:07:.+I
'
\.
San Diego and California type inlets,=„1ii .
..and can be easily serviced without
entering the catchbasin.
Below: The installed unit is barely visible.
.For More Information:-44 ...
:-.),1 ....req,1 .--'\:.'...x:1--.!,;-j \_\
ENVIRONMENTAL SERVICES
P.O. Box 869
--g -,-'
:,.-.-,.,:,,,._4......,r Oceanside, CA 92049 -,,,$'....\,,,,,--'Ph:(760) 433-7640f1.3 -:-1..,'
I :FAX (760) 433 -3176 ...
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-,..,..r.1..t:._-.4;,..':',4 ...ww.biocleanenvironirlental,net --
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-----(-----
BIO CLEAN ENVIRONMENTAL SERVICES
.P 0 Box 869, Oceanside, CA 92049
(760) 433-7640 FAX (760)433-3176
Local Distributor •Sales •Installatlan •Service
,
F 23 "--..I k
TOP VIEW
d.,"
,T /23"
()1..m25"Mounts below the grate \
or with aluminum angle
Air 18"and attaches to wall with
41 .tap cons .All parts -3'1k'.''4,-,.Oil
furnished with ./.003,.i.installation kit including
.
II
111
71
I drill bit.•,.Can also be mounted in
0 14—11"same notch that the grate .
sets in and the aluminum...iti angle is not used Either -.2.-—
°•^1 END VIEW system is ok but I prefer
the aluminum angle
me.system.SIDE VIEW
.:147
I.36"-----.1
..-;
F Overflow(open )
I I
----f.,
rg ----
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25"
3/4 "X 1-3/4 "G •11 M or( Diamond Mesh)
..A 18".io a 10 Mesh
( per sq inch )
14 x 18 Sive size ---•--—
11ilkall ( per sq.inch)
.
14--24"—4,....
idea'PAT PEND.
s..-....
0....
11.Mi
SAN-DIEGO REGIONAL STANDARD SINGLE .-f:t>
.`,
--
._
CATCH BASIN TYPE G PART # SD-G-36-23
..
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ISOMETRIC
.......