HomeMy WebLinkAboutCM_Cons_Mit_&_Haz_Mats_Mgmnt_20210301_v1.pdf
March 1, 2021
Traci Rogstad
Senior Program Director/Project Manager
Renton School District
7812 S. 124th Street
Seattle, WA 98178
Re: Renton ES 16 Project
Construction Mitigation & Hazardous Materials Management
Traci,
The purpose of this letter is to outline certain construction mitigation measures that will be utilized during
construction of the Renton ES #16 Project.
1. Construction Start & Finish Dates:
a. Start: March 1, 2022
b. Completion: September 1, 2023
2. Hours and Days of Operation
a. Days: Monday – Saturday
b. Hours: 6:30am – 5:30pm
3. Haul/Transportation Routes
a. Reference attached Exhibit A_RES #16_Haul Route Plan_21.3.01
4. Measures to be implemented to minimize dust, traffic and transportation impacts, erosion, mud, noise,
and other noxious characteristics
a. Reference attached Exhibit B_RES #16_BMPs_21.03.01
5. Preliminary Traffic Control Plan
a. Reference attached Exhibit C_RES #16_Preliminary Traffic Control Plan_21.03.01
6. Hazardous Materials Management Statement
a. Reference attached Exhibit D_RES #16_CGC Hazardous Materials Management Plan
DRAFT_21.03.01
We look forward to working with the Renton School District to provide a high-quality successful project for the
Renton Community.
Sincerely,
Sam Comer
Cornerstone General Contractor’s, Inc.
PROJECT SITE: Chelan Ave NERenton, WA 98059NORTH BOUND HAUL ROUTE - North on Duvall Ave NE - West on NE Sunset Blvd - North/South on I-405SOUTH BOUND HAUL ROUTE - South on Duvall Ave NE - West on NE 3rd St - North/South on I-405RENTON ES #16 PROJECTHAUL ROUTE PLAN
BMP C101:Preserving Natural Vegetation
Purpose
The purpose of preserving natural vegetation is to reduce erosion wherever practicable.
Limiting site disturbance is the single most effective method for reducing erosion.For
example,conifers can hold up to about 50 percent of all rain that falls during a storm.Up
to 20-30 percent of this rain may never reach the ground but is taken up by the tree or
evaporates.Another benefit is that the rain held in the tree can be released slowly to the
ground after the storm.
Conditions of Use
Natural vegetation should be preserved on steep slopes,near perennial and intermittent
watercourses or swales,and on building sites in wooded areas.
l As required by local governments.
l Phase construction to preserve natural vegetation on the project site for as long as
possible during the construction period.
Design and Installation Specifications
Natural vegetation can be preserved in natural clumps or as individual trees,shrubs and
vines.
The preservation of individual plants is more difficult because heavy equipment is gen-
erally used to remove unwanted vegetation.The points to remember when attempting to
save individual plants are:
l Is the plant worth saving?Consider the location,species,size,age,vigor,and the
work involved.Local governments may also have ordinances to save natural veget-
ation and trees.
l Fence or clearly mark areas around trees that are to be saved.It is preferable to
keep ground disturbance away from the trees at least as far out as the dripline.
Plants need protection from three kinds of injuries:
l Construction Equipment -This injury can be above or below the ground level.
Damage results from scarring,cutting of roots,and compaction of the soil.Placing
a fenced buffer zone around plants to be saved prior to construction can prevent
construction equipment injuries.
l Grade Changes -Changing the natural ground level will alter grades,which affects
the plant's ability to obtain the necessary air,water,and minerals.Minor fills usu-
ally do not cause problems although sensitivity between species does vary and
should be checked.Trees can typically tolerate fill of 6 inches or less.For shrubs
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 266
and other plants,the fill should be less.
When there are major changes in grade,it may become necessary to supply air to
the roots of plants.This can be done by placing a layer of gravel and a tile system
over the roots before the fill is made.A tile system protects a tree from a raised
grade.The tile system should be laid out on the original grade leading from a dry
well around the tree trunk.The system should then be covered with small stones to
allow air to circulate over the root area.
Lowering the natural ground level can seriously damage trees and shrubs.The
highest percentage of the plant roots are in the upper 12 inches of the soil and cuts
of only 2-3 inches can cause serious injury.To protect the roots it may be neces-
sary to terrace the immediate area around the plants to be saved.If roots are
exposed,construction of retaining walls may be needed to keep the soil in place.
Plants can also be preserved by leaving them on an undisturbed,gently sloping
mound.To increase the chances for survival,it is best to limit grade changes and
other soil disturbances to areas outside the dripline of the plant.
l Excavations -Protect trees and other plants when excavating for drainfields,
power,water,and sewer lines.Where possible,the trenches should be routed
around trees and large shrubs.When this is not possible,it is best to tunnel under
them.This can be done with hand tools or with power augers.If it is not possible to
route the trench around plants to be saved,then the following should be observed:
o Cut as few roots as possible.When you have to cut,cut clean.Paint cut root
ends with a wood dressing like asphalt base paint if roots will be exposed for
more than 24-hours.
o Backfill the trench as soon as possible.
o Tunnel beneath root systems as close to the center of the main trunk to pre-
serve most of the important feeder roots.
Some problems that can be encountered with a few specific trees are:
l Maple,Dogwood,Red alder,Western hemlock,Western red cedar,and Douglas fir
do not readily adjust to changes in environment and special care should be taken
to protect these trees.
l The windthrow hazard of Pacific silver fir and madrona is high,while that of
Western hemlock is moderate.The danger of windthrow increases where dense
stands have been thinned.Other species (unless they are on shallow,wet soils
less than 20 inches deep)have a low windthrow hazard.
l Cottonwoods,maples,and willows have water-seeking roots.These can cause
trouble in sewer lines and infiltration fields.On the other hand,they thrive in high
moisture conditions that other trees would not.
l Thinning operations in pure or mixed stands of Grand fir,Pacific silver fir,Noble fir,
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 267
Sitka spruce, Western red cedar, Western hemlock, Pacific dogwood, and Red
alder can cause serious disease problems. Disease can become established
through damaged limbs, trunks, roots, and freshly cut stumps. Diseased and
weakened trees are also susceptible to insect attack.
Maintenance Standards
Inspect flagged and/or fenced areas regularly to make sure flagging or fencing has not
been removed or damaged. If the flagging or fencing has been damaged or visibility
reduced, it shall be repaired or replaced immediately and visibility restored.
l If tree roots have been exposed or injured, “prune” cleanly with an appropriate prun-
ing saw or loppers directly above the damaged roots and recover with native soils.
Treatment of sap flowing trees (fir, hemlock, pine, soft maples) is not advised as
sap forms a natural healing barrier.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 268
BMP C103: High Visibility Fence
Purpose
Fencing is intended to:
1. Restrict clearing to approved limits.
2. Prevent disturbance of sensitive areas, their buffers, and other areas required to be
left undisturbed.
3. Limit construction traffic to designated construction entrances, exits, or internal
roads.
4. Protect areas where marking with survey tape may not provide adequate pro-
tection.
Conditions of Use
To establish clearing limits plastic, fabric, or metal fence may be used:
l At the boundary of sensitive areas, their buffers, and other areas required to be left
uncleared.
l As necessary to control vehicle access to and on the site.
Design and Installation Specifications
High visibility plastic fence shall be composed of a high-density polyethylene material
and shall be at least four feet in height. Posts for the fencing shall be steel or wood and
placed every 6 feet on center (maximum) or as needed to ensure rigidity. The fencing
shall be fastened to the post every six inches with a polyethylene tie. On long continuous
lengths of fencing, a tension wire or rope shall be used as a top stringer to prevent sag-
ging between posts. The fence color shall be high visibility orange. The fence tensile
strength shall be 360 lbs./ft. using the ASTM D4595 testing method.
If appropriate install fabric silt fence in accordance with BMP C233:Silt Fence (p.367)to
act as high visibility fence. Silt fence shall be at least 3 feet high and must be highly vis-
ible to meet the requirements of this BMP.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 269
Metal fences shall be designed and installed according to the manufacturer's spe-
cifications.
Metal fences shall be at least 3 feet high and must be highly visible.
Fences shall not be wired or stapled to trees.
Maintenance Standards
If the fence has been damaged or visibility reduced, it shall be repaired or replaced
immediately and visibility restored.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 270
BMP C105: Stabilized Construction Entrance / Exit
Purpose
Stabilized Construction entrances are established to reduce the amount of sediment
transported onto paved roads by vehicles or equipment. This is done by constructing a
stabilized pad of quarry spalls at entrances and exits for construction sites.
Conditions of Use
Construction entrances shall be stabilized wherever traffic will be entering or leaving a
construction site if paved roads or other paved areas are within 1,000 feet of the site.
For residential construction provide stabilized construction entrances for each residence,
rather than only at the main subdivision entrance. Stabilized surfaces shall be of suf-
ficient length/width to provide vehicle access/parking, based on lot size/configuration.
On large commercial, highway, and road projects, the designer should include enough
extra materials in the contract to allow for additional stabilized entrances not shown in
the initial Construction SWPPP. It is difficult to determine exactly where access to these
projects will take place; additional materials will enable the contractor to install them
where needed.
Design and Installation Specifications
See Figure II-4.1.1 Stabilized Construction Entrance (p.273)for details. Note: the 100’
minimum length of the entrance shall be reduced to the maximum practicable size when
the size or configuration of the site does not allow the full length (100’).
Construct stabilized construction entrances with a 12-inch thick pad of 4-inch to 8-inch
quarry spalls, a 4-inch course of asphalt treated base (ATB), or use existing pavement.
Do not use crushed concrete, cement, or calcium chloride for construction entrance sta-
bilization because these products raise pH levels in stormwater and concrete discharge
to surface waters of the State is prohibited.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 270
A separation geotextile shall be placed under the spalls to prevent fine sediment from
pumping up into the rock pad.The geotextile shall meet the following standards:
Grab Tensile Strength (ASTM D4751)200 psi min.
Grab Tensile Elongation (ASTM D4632)30%max.
Mullen Burst Strength (ASTM D3786-80a)400 psi min.
AOS (ASTM D4751)20-45 (U.S.standard sieve size)
l Consider early installation of the first lift of asphalt in areas that will paved;this can
be used as a stabilized entrance.Also consider the installation of excess concrete
as a stabilized entrance.During large concrete pours,excess concrete is often
available for this purpose.
l Fencing (see BMP C103:High Visibility Fence (p.269))shall be installed as neces-
sary to restrict traffic to the construction entrance.
l Whenever possible,the entrance shall be constructed on a firm,compacted sub-
grade.This can substantially increase the effectiveness of the pad and reduce the
need for maintenance.
l Construction entrances should avoid crossing existing sidewalks and back of walk
drains if at all possible.If a construction entrance must cross a sidewalk or back of
walk drain,the full length of the sidewalk and back of walk drain must be covered
and protected from sediment leaving the site.
Maintenance Standards
Quarry spalls shall be added if the pad is no longer in accordance with the spe-
cifications.
l If the entrance is not preventing sediment from being tracked onto pavement,then
alternative measures to keep the streets free of sediment shall be used.This may
include replacement/cleaning of the existing quarry spalls,street sweeping,an
increase in the dimensions of the entrance,or the installation of a wheel wash.
l Any sediment that is tracked onto pavement shall be removed by shoveling or
street sweeping.The sediment collected by sweeping shall be removed or sta-
bilized on site.The pavement shall not be cleaned by washing down the street,
except when high efficiency sweeping is ineffective and there is a threat to public
safety.If it is necessary to wash the streets,the construction of a small sump to con-
tain the wash water shall be considered.The sediment would then be washed into
the sump where it can be controlled.
l Perform street sweeping by hand or with a high efficiency sweeper.Do not use a
non-high efficiency mechanical sweeper because this creates dust and throws
soils into storm systems or conveyance ditches.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 271
l Any quarry spalls that are loosened from the pad,which end up on the roadway
shall be removed immediately.
l If vehicles are entering or exiting the site at points other than the construction
entrance(s),fencing (see BMP C103)shall be installed to control traffic.
l Upon project completion and site stabilization,all construction accesses intended
as permanent access for maintenance shall be permanently stabilized.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 272
Figure II-4.1.1 Stabilized Construction Entrance
D EPARTMENT OF
ECOLOGY
State of Washington
Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
limitation of liability, and disclaimer.
Figure II-4.1.1
Stabilized Construction Entrance
Revised June 2015
NOT TO SCALE
Existin
g
R
o
a
d
Notes:
1. Driveway shall meet
the requirements of the
permitting agency.
2. It is recommended that
the entrance be
crowned so that runoff
drains off the pad.
Install driveway
culvert if there is a
roadside ditch present 4" - 8" quarry
spalls
Geotextile
12" minimum thickness
15' min.
100' min.
Provide full width
of ingress/egress
area
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 273
Approved as Equivalent
Ecology has approved products as able to meet the requirements of BMP C105:Stab-
ilized Construction Entrance /Exit. The products did not pass through the Technology
Assessment Protocol – Ecology (TAPE) process. Local jurisdictions may choose not to
accept this product approved as equivalent, or may require additional testing prior to con-
sideration for local use. The products are available for review on Ecology’s website at
http://www.ecy.wa.gov/programs/wq/stormwater/newtech/equivalent.html
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 274
BMP C106: Wheel Wash
Purpose
Wheel washes reduce the amount of sediment transported onto paved roads by motor
vehicles.
Conditions of Use
When a stabilized construction entrance (see BMP C105:Stabilized Construction
Entrance /Exit (p.270)) is not preventing sediment from being tracked onto pavement.
l Wheel washing is generally an effective BMP when installed with careful attention
to topography. For example, a wheel wash can be detrimental if installed at the top
of a slope abutting a right-of-way where the water from the dripping truck can run
unimpeded into the street.
l Pressure washing combined with an adequately sized and surfaced pad with dir-
ect drainage to a large 10-foot x 10-foot sump can be very effective.
l Discharge wheel wash or tire bath wastewater to a separate on-site treatment sys-
tem that prevents discharge to surface water, such as closed-loop recirculation or
upland land application, or to the sanitary sewer with local sewer district approval.
l Wheel wash or tire bath wastewater should not include wastewater from concrete
washout areas.
Design and Installation Specifications
Suggested details are shown in Figure II-4.1.2 Wheel Wash (p.276). The Local Per-
mitting Authority may allow other designs. A minimum of 6 inches of asphalt treated base
(ATB) over crushed base material or 8 inches over a good subgrade is recommended to
pave the wheel wash.
Use a low clearance truck to test the wheel wash before paving. Either a belly dump or
lowboy will work well to test clearance.
Keep the water level from 12 to 14 inches deep to avoid damage to truck hubs and filling
the truck tongues with water.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 274
Midpoint spray nozzles are only needed in extremely muddy conditions.
Wheel wash systems should be designed with a small grade change,6-to 12-inches for
a 10-foot-wide pond,to allow sediment to flow to the low side of pond to help prevent re-
suspension of sediment.A drainpipe with a 2-to 3-foot riser should be installed on the
low side of the pond to allow for easy cleaning and refilling.Polymers may be used to
promote coagulation and flocculation in a closed-loop system.Polyacrylamide (PAM)
added to the wheel wash water at a rate of 0.25 -0.5 pounds per 1,000 gallons of water
increases effectiveness and reduces cleanup time.If PAM is already being used for dust
or erosion control and is being applied by a water truck,the same truck can be used to
change the wash water.
Maintenance Standards
The wheel wash should start out the day with fresh water.
The wash water should be changed a minimum of once per day.On large earthwork
jobs where more than 10-20 trucks per hour are expected,the wash water will need to
be changed more often.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 275
Figure II-4.1.2 Wheel Wash
D EPARTMENT OF
ECOLOGY
State of Washington
Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
limitation of liability, and disclaimer.
Figure II-4.1.2
Wheel Wash
Revised June 2015
NOT TO SCALE
Notes:
1. Build 8' x 8' sump to accomodate
cleaning by trackhoe.
6" sewer pipe with
butterfly valves
8' x 8' sump with 5' of catch
3" trash pump with
floats on suction hose
2" schedule 40
1 12 " schedule 40 for sprayers
midpoint spray nozzles, if needed
15' ATB apron to protect
ground from splashing water
6" sleeve under road
6" ATB construction entrance
Asphalt curb on the low road
side to direct water back to pond
Ball valves
2% slope 5:1 slope
1:1 slope
5:1 slope
2% slope
A
A
Plan View
15'15'20'15'50'
Curb
6" sleeve
Elevation View
Locate invert of top pipe 1'
above bottom of wheel wash
8' x 8' sump
5'
Drain pipe
12'
3'
18'
Water level
1:1 slope
Section A-A
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 276
BMP C107:Construction Road/Parking Area Stabilization
Purpose
Stabilizing subdivision roads,parking areas,and other on-site vehicle transportation
routes immediately after grading reduces erosion caused by construction traffic or runoff.
Conditions of Use
Roads or parking areas shall be stabilized wherever they are constructed,whether per-
manent or temporary,for use by construction traffic.
l High Visibility Fencing (see BMP C103:High Visibility Fence (p.269))shall be
installed,if necessary,to limit the access of vehicles to only those roads and park-
ing areas that are stabilized.
Design and Installation Specifications
l On areas that will receive asphalt as part of the project,install the first lift as soon
as possible.
l A 6-inch depth of 2-to 4-inch crushed rock,gravel base,or crushed surfacing base
course shall be applied immediately after grading or utility installation.A 4-inch
course of asphalt treated base (ATB)may also be used,or the road/parking area
may be paved.It may also be possible to use cement or calcium chloride for soil
stabilization.If cement or cement kiln dust is used for roadbase stabilization,pH
monitoring and BMPs (BMP C252:High pH Neutralization Using CO2 (p.409)and
BMP C253:pH Control for High pH Water (p.412))are necessary to evaluate and
minimize the effects on stormwater.If the area will not be used for permanent
roads,parking areas,or structures,a 6-inch depth of hog fuel may also be used,
but this is likely to require more maintenance.Whenever possible,construction
roads and parking areas shall be placed on a firm,compacted subgrade.
l Temporary road gradients shall not exceed 15 percent.Roadways shall be care-
fully graded to drain.Drainage ditches shall be provided on each side of the road-
way in the case of a crowned section,or on one side in the case of a super-
elevated section.Drainage ditches shall be directed to a sediment control BMP.
l Rather than relying on ditches,it may also be possible to grade the road so that run-
off sheet-flows into a heavily vegetated area with a well-developed topsoil.Land-
scaped areas are not adequate.If this area has at least 50 feet of vegetation that
water can flow through,then it is generally preferable to use the vegetation to treat
runoff,rather than a sediment pond or trap.The 50 feet shall not include wetlands
or their buffers.If runoff is allowed to sheetflow through adjacent vegetated areas,it
is vital to design the roadways and parking areas so that no concentrated runoff is
created.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 277
l Storm drain inlets shall be protected to prevent sediment-laden water entering the
storm drain system (see BMP C220:Storm Drain Inlet Protection (p.357)).
Maintenance Standards
Inspect stabilized areas regularly, especially after large storm events.
Crushed rock, gravel base, etc., shall be added as required to maintain a stable driving
surface and to stabilize any areas that have eroded.
Following construction, these areas shall be restored to pre-construction condition or bet-
ter to prevent future erosion.
Perform street cleaning at the end of each day or more often if necessary.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 278
BMP C140:Dust Control
Purpose
Dust control prevents wind transport of dust from disturbed soil surfaces onto roadways,
drainage ways,and surface waters.
Conditions of Use
l In areas (including roadways)subject to surface and air movement of dust where
on-site and off-site impacts to roadways,drainage ways,or surface waters are
likely.
Design and Installation Specifications
l Vegetate or mulch areas that will not receive vehicle traffic.In areas where plant-
ing,mulching,or paving is impractical,apply gravel or landscaping rock.
l Limit dust generation by clearing only those areas where immediate activity will
take place,leaving the remaining area(s)in the original condition.Maintain the ori-
ginal ground cover as long as practical.
l Construct natural or artificial windbreaks or windscreens.These may be designed
as enclosures for small dust sources.
l Sprinkle the site with water until surface is wet.Repeat as needed.To prevent
carryout of mud onto street,refer to BMP C105:Stabilized Construction Entrance /
Exit (p.270).
l Irrigation water can be used for dust control.Irrigation systems should be installed
as a first step on sites where dust control is a concern.
l Spray exposed soil areas with a dust palliative,following the manufacturer’s
instructions and cautions regarding handling and application.Used oil is pro-
hibited from use as a dust suppressant.Local governments may approve other
dust palliatives such as calcium chloride or PAM.
l PAM (BMP C126:Polyacrylamide (PAM)for Soil Erosion Protection (p.300))
added to water at a rate of 0.5 lbs.per 1,000 gallons of water per acre and applied
from a water truck is more effective than water alone.This is due to increased infilt-
ration of water into the soil and reduced evaporation.In addition,small soil
particles are bonded together and are not as easily transported by wind.Adding
PAM may actually reduce the quantity of water needed for dust control.Use of
PAM could be a cost-effective dust control method.
Techniques that can be used for unpaved roads and lots include:
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 310
l Lower speed limits. High vehicle speed increases the amount of dust stirred up
from unpaved roads and lots.
l Upgrade the road surface strength by improving particle size, shape, and mineral
types that make up the surface and base materials.
l Add surface gravel to reduce the source of dust emission. Limit the amount of fine
particles (those smaller than .075 mm) to 10 to 20 percent.
l Use geotextile fabrics to increase the strength of new roads or roads undergoing
reconstruction.
l Encourage the use of alternate, paved routes, if available.
l Restrict use of paved roadways by tracked vehicles and heavy trucks to prevent
damage to road surface and base.
l Apply chemical dust suppressants using the admix method, blending the product
with the top few inches of surface material. Suppressants may also be applied as
surface treatments.
l Pave unpaved permanent roads and other trafficked areas.
l Use vacuum street sweepers.
l Remove mud and other dirt promptly so it does not dry and then turn into dust.
l Limit dust-causing work on windy days.
l Contact your local Air Pollution Control Authority for guidance and training on other
dust control measures. Compliance with the local Air Pollution Control Authority
constitutes compliance with this BMP.
Maintenance Standards
Respray area as necessary to keep dust to a minimum.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 311
BMP C150: Materials on Hand
Purpose
Keep quantities of erosion prevention and sediment control materials on the project site
at all times to be used for regular maintenance and emergency situations such as unex-
pected heavy summer rains. Having these materials on-site reduces the time needed to
implement BMPs when inspections indicate that existing BMPs are not meeting the Con-
struction SWPPP requirements. In addition, contractors can save money by buying some
materials in bulk and storing them at their office or yard.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 311
Conditions of Use
l Construction projects of any size or type can benefit from having materials on
hand. A small commercial development project could have a roll of plastic and
some gravel available for immediate protection of bare soil and temporary berm
construction. A large earthwork project, such as highway construction, might have
several tons of straw, several rolls of plastic, flexible pipe, sandbags, geotextile fab-
ric and steel “T” posts.
l Materials are stockpiled and readily available before any site clearing, grubbing, or
earthwork begins. A large contractor or developer could keep a stockpile of mater-
ials that are available for use on several projects.
l If storage space at the project site is at a premium, the contractor could maintain
the materials at their office or yard. The office or yard must be less than an hour
from the project site.
Design and Installation Specifications
Depending on project type, size, complexity, and length, materials and quantities will
vary. A good minimum list of items that will cover numerous situations includes:
Material
Clear Plastic, 6 mil
Drainpipe, 6 or 8 inch diameter
Sandbags, filled
Straw Bales for mulching,
Quarry Spalls
Washed Gravel
Geotextile Fabric
Catch Basin Inserts
Steel "T" Posts
Silt fence material
Straw Wattles
Maintenance Standards
l All materials with the exception of the quarry spalls, steel “T” posts, and gravel
should be kept covered and out of both sun and rain.
l Re-stock materials used as needed.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 312
BMP C160:Certified Erosion and Sediment Control Lead
Purpose
The project proponent designates at least one person as the responsible representative
in charge of erosion and sediment control (ESC),and water quality protection.The des-
ignated person shall be the Certified Erosion and Sediment Control Lead (CESCL)who
is responsible for ensuring compliance with all local,state,and federal erosion and sed-
iment control and water quality requirements.
Conditions of Use
A CESCL shall be made available on projects one acre or larger that discharge storm-
water to surface waters of the state.Sites less than one acre may have a person without
CESCL certification conduct inspections;sampling is not required on sites that disturb
less than an acre.
l The CESCL shall:
l Have a current certificate proving attendance in an erosion and sediment con-
trol training course that meets the minimum ESC training and certification
requirements established by Ecology (see details below).
Ecology will maintain a list of ESC training and certification providers at:
http://www.ecy.wa.gov/programs/wq/stormwater/cescl.html
OR
l Be a Certified Professional in Erosion and Sediment Control (CPESC);for
additional information go to:http://www.envirocertintl.org/cpesc/
Specifications
l Certification shall remain valid for three years.
l The CESCL shall have authority to act on behalf of the contractor or developer and
shall be available,or on-call,24 hours per day throughout the period of con-
struction.
l The Construction SWPPP shall include the name,telephone number,fax number,
and address of the designated CESCL.
l A CESCL may provide inspection and compliance services for multiple con-
struction projects in the same geographic region.
Duties and responsibilities of the CESCL shall include,but are not limited to the fol-
lowing:
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 325
l Maintaining permit file on site at all times which includes the Construction SWPPP
and any associated permits and plans.
l Directing BMP installation, inspection, maintenance, modification, and removal.
l Updating all project drawings and the Construction SWPPP with changes made.
l Completing any sampling requirements including reporting results using
WebDMR.
l Keeping daily logs, and inspection reports. Inspection reports should include:
l Inspection date/time.
l Weather information; general conditions during inspection and approximate
amount of precipitation since the last inspection.
l A summary or list of all BMPs implemented, including observations of all
erosion/sediment control structures or practices. The following shall be
noted:
1. Locations of BMPs inspected.
2. Locations of BMPs that need maintenance.
3. Locations of BMPs that failed to operate as designed or intended.
4. Locations of where additional or different BMPs are required.
l Visual monitoring results, including a description of discharged stormwater.
The presence of suspended sediment, turbid water, discoloration, and oil
sheen shall be noted, as applicable.
l Any water quality monitoring performed during inspection.
l General comments and notes, including a brief description of any BMP
repairs, maintenance or installations made as a result of the inspection.
l Facilitate, participate in, and take corrective actions resulting from inspections per-
formed by outside agencies or the owner.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 326
BMP C200: Interceptor Dike and Swale
Purpose
Provide a ridge of compacted soil, or a ridge with an upslope swale, at the top or base of
a disturbed slope or along the perimeter of a disturbed construction area to convey storm-
water. Use the dike and/or swale to intercept the runoff from unprotected areas and direct
it to areas where erosion can be controlled. This can prevent storm runoff from entering
the work area or sediment-laden runoff from leaving the construction site.
Conditions of Use
Where the runoff from an exposed site or disturbed slope must be conveyed to an
erosion control facility which can safely convey the stormwater.
l Locate upslope of a construction site to prevent runoff from entering disturbed area.
l When placed horizontally across a disturbed slope, it reduces the amount and velo-
city of runoff flowing down the slope.
l Locate downslope to collect runoff from a disturbed area and direct water to a sed-
iment basin.
Design and Installation Specifications
l Dike and/or swale and channel must be stabilized with temporary or permanent
vegetation or other channel protection during construction.
l Channel requires a positive grade for drainage; steeper grades require channel
protection and check dams.
l Review construction for areas where overtopping may occur.
l Can be used at top of new fill before vegetation is established.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 331
l May be used as a permanent diversion channel to carry the runoff.
l Sub-basin tributary area should be one acre or less.
l Design capacity for the peak volumetric flow rate calculated using a 10-minute time
step from a 10-year,24-hour storm,assuming a Type 1A rainfall distribution,for
temporary facilities.Alternatively,use 1.6 times the 10-year,1-hour flow indicated
by an approved continuous runoff model.For facilities that will also serve on a per-
manent basis,consult the local government’s drainage requirements.
Interceptor dikes shall meet the following criteria:
l Top Width:2 feet minimum.
l Height:1.5 feet minimum on berm.
l Side Slope:2H:1V or flatter.
l Grade:Depends on topography,however,dike system minimum is 0.5%,and max-
imum is 1%.
l Compaction:Minimum of 90 percent ASTM D698 standard proctor.
l Horizontal Spacing of Interceptor Dikes:
Average Slope Slope Percent Flowpath Length
20H:1V or less 3-5%300 feet
(10 to 20)H:1V 5-10%200 feet
(4 to 10)H:1V 10-25%100 feet
(2 to 4)H:1V 25-50%50 feet
l Stabilization:depends on velocity and reach
l Slopes <5%:Seed and mulch applied within 5 days of dike construction (see BMP
C121:Mulching (p.284)).
l Slopes 5 -40%:Dependent on runoff velocities and dike materials.Stabilization
should be done immediately using either sod or riprap or other measures to avoid
erosion.
l The upslope side of the dike shall provide positive drainage to the dike outlet.No
erosion shall occur at the outlet.Provide energy dissipation measures as neces-
sary.Sediment-laden runoff must be released through a sediment trapping facility.
l Minimize construction traffic over temporary dikes.Use temporary cross culverts for
channel crossing.
Interceptor swales shall meet the following criteria:
l Bottom Width:2 feet minimum;the cross-section bottom shall be level.
l Depth:1-foot minimum.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 332
l Side Slope: 2H:1V or flatter.
l Grade: Maximum 5 percent, with positive drainage to a suitable outlet (such as a
sediment pond).
l Stabilization: Seed as per BMP C120:Temporary and Permanent Seeding (p.278),
or BMP C202:Channel Lining (p.338), 12 inches thick riprap pressed into the bank
and extending at least 8 inches vertical from the bottom.
Inspect diversion dikes and interceptor swales once a week and after every rainfall.
Immediately remove sediment from the flow area.
Damage caused by construction traffic or other activity must be repaired before the end
of each working day.
Check outlets and make timely repairs as needed to avoid gully formation. When the
area below the temporary diversion dike is permanently stabilized, remove the dike and
fill and stabilize the channel to blend with the natural surface.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 333
BMP C220: Storm Drain Inlet Protection
Purpose
Storm drain inlet protection prevents coarse sediment from entering drainage systems
prior to permanent stabilization of the disturbed area.
Conditions of Use
Use storm drain inlet protection at inlets that are operational before permanent sta-
bilization of the disturbed drainage area. Provide protection for all storm drain inlets
downslope and within 500 feet of a disturbed or construction area, unless conveying run-
off entering catch basins to a sediment pond or trap.
Also consider inlet protection for lawn and yard drains on new home construction. These
small and numerous drains coupled with lack of gutters in new home construction can
add significant amounts of sediment into the roof drain system. If possible delay
installing lawn and yard drains until just before landscaping or cap these drains to pre-
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 357
vent sediment from entering the system until completion of landscaping.Provide 18-
inches of sod around each finished lawn and yard drain.
Table II-4.2.2 Storm Drain Inlet Protection (p.358)lists several options for inlet protection.
All of the methods for storm drain inlet protection tend to plug and require a high fre-
quency of maintenance.Limit drainage areas to one acre or less.Possibly provide emer-
gency overflows with additional end-of-pipe treatment where stormwater ponding would
cause a hazard.
Type of Inlet
Protection
Emergency
Overflow
Applicable for
Paved/Earthen
Surfaces
Conditions of Use
Drop Inlet Protection
Excavated drop
inlet protection
Yes,tem-
porary flood-
ing will occur
Earthen
Applicable for heavy flows.Easy
to maintain.Large area Require-
ment:30'x30'/acre
Block and
gravel drop inlet
protection
Yes Paved or Earthen Applicable for heavy concentrated
flows.Will not pond.
Gravel and wire
drop inlet pro-
tection
No
Applicable for heavy concentrated
flows.Will pond.Can withstand
traffic.
Catch basin fil-
ters Yes Paved or Earthen Frequent Maintenance required.
Curb Inlet Protection
Curb inlet pro-
tection with
wooden weir
Small capacity
overflow Paved Used for sturdy,more compact
installation.
Block and
gravel curb inlet
protection
Yes Paved Sturdy,but limited filtration.
Culvert Inlet Protection
Culvert inlet Sed-
iment trap 18 month expected life.
Table II-4.2.2 Storm Drain Inlet Protection
Design and Installation Specifications
Excavated Drop Inlet Protection -An excavated impoundment around the storm drain.
Sediment settles out of the stormwater prior to entering the storm drain.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 358
l Provide a depth of 1-2 ft as measured from the crest of the inlet structure.
l Slope sides of excavation no steeper than 2H:1V.
l Minimum volume of excavation 35 cubic yards.
l Shape basin to fit site with longest dimension oriented toward the longest inflow
area.
l Install provisions for draining to prevent standing water problems.
l Clear the area of all debris.
l Grade the approach to the inlet uniformly.
l Drill weep holes into the side of the inlet.
l Protect weep holes with screen wire and washed aggregate.
l Seal weep holes when removing structure and stabilizing area.
l Build a temporary dike,if necessary,to the down slope side of the structure to pre-
vent bypass flow.
Block and Gravel Filter -A barrier formed around the storm drain inlet with standard con-
crete blocks and gravel.See Figure II-4.2.8 Block and Gravel Filter (p.360).
l Provide a height of 1 to 2 feet above inlet.
l Recess the first row 2-inches into the ground for stability.
l Support subsequent courses by placing a 2x4 through the block opening.
l Do not use mortar.
l Lay some blocks in the bottom row on their side for dewatering the pool.
l Place hardware cloth or comparable wire mesh with ½-inch openings over all
block openings.
l Place gravel just below the top of blocks on slopes of 2H:1V or flatter.
l An alternative design is a gravel donut.
l Provide an inlet slope of 3H:1V.
l Provide an outlet slope of 2H:1V.
l Provide a1-foot wide level stone area between the structure and the inlet.
l Use inlet slope stones 3 inches in diameter or larger.
l Use gravel ½-to ¾-inch at a minimum thickness of 1-foot for the outlet slope.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 359
Figure II-4.2.8 Block and Gravel Filter
D EPARTMENT OF
ECOLOGY
State of Washington
Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
limitation of liability, and disclaimer.
Figure II-4.2.8
Block and Gravel Filter
Revised August 2015
NOT TO SCALE
Plan View
A
A
Section A-A
Drain grate
Concrete block
Gravel backfill
Less than5% slope
Gravel backfill
Concrete block
Water
Overflow
water
Drop inlet
Ponding height
Wire screen or
filter fabric
Notes:
1. Drop inlet sediment barriers are to be used for small, nearly level drainage areas. (less
than 5%)
2. Excavate a basin of sufficient size adjacent to the drop inlet.
3. The top of the structure (ponding height) must be well below the ground elevation
downslope to prevent runoff from bypassing the inlet. A temporary dike may be
necessary on the downslope side of the structure.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 360
Gravel and Wire Mesh Filter -A gravel barrier placed over the top of the inlet.This struc-
ture does not provide an overflow.
l Use a hardware cloth or comparable wire mesh with ½-inch openings.
l Use coarse aggregate.
l Provide a height 1-foot or more,18-inches wider than inlet on all sides.
l Place wire mesh over the drop inlet so that the wire extends a minimum of 1-foot
beyond each side of the inlet structure.
l Overlap the strips if more than one strip of mesh is necessary.
l Place coarse aggregate over the wire mesh.
l Provide at least a 12-inch depth of gravel over the entire inlet opening and extend
at least 18-inches on all sides.
Catchbasin Filters –Use inserts designed by manufacturers for construction sites.The
limited sediment storage capacity increases the amount of inspection and maintenance
required,which may be daily for heavy sediment loads.To reduce maintenance require-
ments combine a catchbasin filter with another type of inlet protection.This type of inlet
protection provides flow bypass without overflow and therefore may be a better method
for inlets located along active rights-of-way.
l Provides 5 cubic feet of storage.
l Requires dewatering provisions.
l Provides a high-flow bypass that will not clog under normal use at a construction
site.
l Insert the catchbasin filter in the catchbasin just below the grating.
Curb Inlet Protection with Wooden Weir –Barrier formed around a curb inlet with a
wooden frame and gravel.
l Use wire mesh with ½-inch openings.
l Use extra strength filter cloth.
l Construct a frame.
l Attach the wire and filter fabric to the frame.
l Pile coarse washed aggregate against wire/fabric.
l Place weight on frame anchors.
Block and Gravel Curb Inlet Protection –Barrier formed around a curb inlet with concrete
blocks and gravel.See Figure II-4.2.9 Block and Gravel Curb Inlet Protection (p.363).
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 361
l Use wire mesh with ½-inch openings.
l Place two concrete blocks on their sides abutting the curb at either side of the inlet
opening.These are spacer blocks.
l Place a 2x4 stud through the outer holes of each spacer block to align the front
blocks.
l Place blocks on their sides across the front of the inlet and abutting the spacer
blocks.
l Place wire mesh over the outside vertical face.
l Pile coarse aggregate against the wire to the top of the barrier.
Curb and Gutter Sediment Barrier –Sandbag or rock berm (riprap and aggregate)3 feet
high and 3 feet wide in a horseshoe shape.See Figure II-4.2.10 Curb and Gutter Barrier
(p.364).
l Construct a horseshoe shaped berm,faced with coarse aggregate if using riprap,3
feet high and 3 feet wide,at least 2 feet from the inlet.
l Construct a horseshoe shaped sedimentation trap on the outside of the berm sized
to sediment trap standards for protecting a culvert inlet.
Maintenance Standards
l Inspect catch basin filters frequently,especially after storm events.Clean and
replace clogged inserts.For systems with clogged stone filters:pull away the
stones from the inlet and clean or replace.An alternative approach would be to use
the clogged stone as fill and put fresh stone around the inlet.
l Do not wash sediment into storm drains while cleaning.Spread all excavated
material evenly over the surrounding land area or stockpile and stabilize as appro-
priate.
Approved as Equivalent
Ecology has approved products as able to meet the requirements of BMP C220:Storm
Drain Inlet Protection.The products did not pass through the Technology Assessment
Protocol –Ecology (TAPE)process.Local jurisdictions may choose not to accept this
product approved as equivalent,or may require additional testing prior to consideration
for local use.The products are available for review on Ecology’s website at
http://www.ecy.wa.gov/programs/wq/stormwater/newtech/equivalent.html
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 362
Figure II-4.2.9 Block and Gravel Curb Inlet Protection
D EPARTMENT OF
ECOLOGY
State of Washington
Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
limitation of liability, and disclaimer.
Figure II-4.2.9
Block and Gravel Curb Inlet Protection
Revised August 2015
NOT TO SCALE
Plan View
A
A
Section A-A
Notes:
1. Use block and gravel type sediment barrier when curb inlet is located in gently sloping street
segment, where water can pond and allow sediment to separate from runoff.
2. Barrier shall allow for overflow from severe storm event.
3. Inspect barriers and remove sediment after each storm event. Sediment and gravel must be
removed from the traveled way immediately.
Back of sidewalk
Catch basin
Back of curb Curb inlet Concrete block
2x4 Wood stud
Concrete block34 inch (20 mm)
Drain gravel
Wire screen or
filter fabric
3 4 inch (20 mm)
Drain gravel
Wire screen or
filter fabric
Ponding height
Overflow
2x4 Wood stud
(100x50 Timber stud)
Concrete block
Curb inlet
Catch basin
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 363
Figure II-4.2.10 Curb and Gutter Barrier
D EPARTMENT OF
ECOLOGY
State of Washington
Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
limitation of liability, and disclaimer.
Figure II-4.2.10
Curb and Gutter Barrier
Revised September 2015
NOT TO SCALE
Plan View
Back of sidewalk
Runoff
Runoff Spillway
Burlap sacks to
overlap onto curb
Gravel filled sandbags
stacked tightly
Curb inlet
Catch basin
Back of curb
Notes:
1. Place curb type sediment barriers on gently sloping street segments, where water can
pond and allow sediment to separate from runoff.
2. Sandbags of either burlap or woven 'geotextile' fabric, are filled with gravel, layered
and packed tightly.
3. Leave a one sandbag gap in the top row to provide a spillway for overflow.
4. Inspect barriers and remove sediment after each storm event. Sediment and gravel
must be removed from the traveled way immediately.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 364
BMP C233: Silt Fence
Purpose
Use of a silt fence reduces the transport of coarse sediment from a construction site by
providing a temporary physical barrier to sediment and reducing the runoff velocities of
overland flow. See Figure II-4.2.12 Silt Fence (p.369)for details on silt fence con-
struction.
Conditions of Use
Silt fence may be used downslope of all disturbed areas.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 367
l Silt fence shall prevent soil carried by runoff water from going beneath,through,or
over the top of the silt fence,but shall allow the water to pass through the fence.
l Silt fence is not intended to treat concentrated flows,nor is it intended to treat sub-
stantial amounts of overland flow.Convey any concentrated flows through the
drainage system to a sediment pond.
l Do not construct silt fences in streams or use in V-shaped ditches.Silt fences do
not provide an adequate method of silt control for anything deeper than sheet or
overland flow.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 368
Figure II-4.2.12 Silt Fence
D EPARTMENT OF
ECOLOGY
State of Washington
Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
limitation of liability, and disclaimer.
Figure II-4.2.12
Silt Fence
Revised October 2014
NOT TO SCALE
Joints in filter fabric shall be spliced
at posts. Use staples, wire rings or
equivalent to attach fabric to posts
6' max
Post spacing may be increased
to 8' if wire backing is used
2"x2" by 14 Ga. wire or equivalent,
if standard strength fabric used
Minimum
4"x4" trench
2"x2" wood posts, steel
fence posts, or equivalent
12" min
2' min
2"x2" by 14 Ga. wire or equivalent,
if standard strength fabric used
Filter fabric
Minimum
4"x4" trench
2"x2" wood posts, steel
fence posts, or equivalent
Backfill trench with
native soil or 3 4" -
1.5" washed gravel
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 369
Design and Installation Specifications
l Use in combination with sediment basins or other BMPs.
l Maximum slope steepness (normal (perpendicular)to fence line)1H:1V.
l Maximum sheet or overland flow path length to the fence of 100 feet.
l Do not allow flows greater than 0.5 cfs.
l The geotextile used shall meet the following standards.All geotextile properties lis-
ted below are minimum average roll values (i.e.,the test result for any sampled roll
in a lot shall meet or exceed the values shown in Table II-4.2.3 Geotextile Stand-
ards (p.370)):
Polymeric Mesh AOS
(ASTM D4751)
0.60 mm maximum for slit film woven (#30 sieve).
0.30 mm maximum for all other geotextile types (#50 sieve).
0.15 mm minimum for all fabric types (#100 sieve).
Water Permittivity
(ASTM D4491)
0.02 sec-1 minimum
Grab Tensile Strength
(ASTM D4632)
180 lbs.Minimum for extra strength fabric.
100 lbs minimum for standard strength fabric.
Grab Tensile Strength
(ASTM D4632)
30%maximum
Ultraviolet Resistance
(ASTM D4355)
70%minimum
Table II-4.2.3 Geotextile Standards
l Support standard strength fabrics with wire mesh,chicken wire,2-inch x 2-inch
wire,safety fence,or jute mesh to increase the strength of the fabric.Silt fence
materials are available that have synthetic mesh backing attached.
l Filter fabric material shall contain ultraviolet ray inhibitors and stabilizers to provide
a minimum of six months of expected usable construction life at a temperature
range of 0°F.to 120°F.
l One-hundred percent biodegradable silt fence is available that is strong,long last-
ing,and can be left in place after the project is completed,if permitted by local reg-
ulations.
l Refer to Figure II-4.2.12 Silt Fence (p.369)for standard silt fence details.Include
the following standard Notes for silt fence on construction plans and specifications:
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 370
1.The contractor shall install and maintain temporary silt fences at the locations
shown in the Plans.
2.Construct silt fences in areas of clearing,grading,or drainage prior to starting
those activities.
3.The silt fence shall have a 2-feet min.and a 2½-feet max.height above the
original ground surface.
4.The filter fabric shall be sewn together at the point of manufacture to form fil-
ter fabric lengths as required.Locate all sewn seams at support posts.Altern-
atively,two sections of silt fence can be overlapped,provided the Contractor
can demonstrate,to the satisfaction of the Engineer,that the overlap is long
enough and that the adjacent fence sections are close enough together to
prevent silt laden water from escaping through the fence at the overlap.
5.Attach the filter fabric on the up-slope side of the posts and secure with
staples,wire,or in accordance with the manufacturer's recommendations.
Attach the filter fabric to the posts in a manner that reduces the potential for
tearing.
6.Support the filter fabric with wire or plastic mesh,dependent on the properties
of the geotextile selected for use.If wire or plastic mesh is used,fasten the
mesh securely to the up-slope side of the posts with the filter fabric up-slope
of the mesh.
7.Mesh support,if used,shall consist of steel wire with a maximum mesh spa-
cing of 2-inches,or a prefabricated polymeric mesh.The strength of the wire
or polymeric mesh shall be equivalent to or greater than 180 lbs.grab tensile
strength.The polymeric mesh must be as resistant to the same level of ultra-
violet radiation as the filter fabric it supports.
8.Bury the bottom of the filter fabric 4-inches min.below the ground surface.
Backfill and tamp soil in place over the buried portion of the filter fabric,so
that no flow can pass beneath the fence and scouring cannot occur.When
wire or polymeric back-up support mesh is used,the wire or polymeric mesh
shall extend into the ground 3-inches min.
9.Drive or place the fence posts into the ground 18-inches min.A 12–inch min.
depth is allowed if topsoil or other soft subgrade soil is not present and 18-
inches cannot be reached.Increase fence post min.depths by 6 inches if the
fence is located on slopes of 3H:1V or steeper and the slope is perpendicular
to the fence.If required post depths cannot be obtained,the posts shall be
adequately secured by bracing or guying to prevent overturning of the fence
due to sediment loading.
10.Use wood,steel or equivalent posts.The spacing of the support posts shall
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 371
be a maximum of 6-feet.Posts shall consist of either:
l Wood with dimensions of 2-inches by 2-inches wide min.and a 3-feet
min.length.Wood posts shall be free of defects such as knots,splits,or
gouges.
l No.6 steel rebar or larger.
l ASTM A 120 steel pipe with a minimum diameter of 1-inch.
l U,T,L,or C shape steel posts with a minimum weight of 1.35 lbs./ft.
l Other steel posts having equivalent strength and bending resistance to
the post sizes listed above.
11.Locate silt fences on contour as much as possible,except at the ends of the
fence,where the fence shall be turned uphill such that the silt fence captures
the runoff water and prevents water from flowing around the end of the fence.
12.If the fence must cross contours,with the exception of the ends of the fence,
place gravel check dams perpendicular to the back of the fence to minimize
concentrated flow and erosion.The slope of the fence line where contours
must be crossed shall not be steeper than 3H:1V.
l Gravel check dams shall be approximately 1-foot deep at the back of
the fence.Gravel check dams shall be continued perpendicular to the
fence at the same elevation until the top of the check dam intercepts the
ground surface behind the fence.
l Gravel check dams shall consist of crushed surfacing base course,
gravel backfill for walls,or shoulder ballast.Gravel check dams shall be
located every 10 feet along the fence where the fence must cross con-
tours.
l Refer to Figure II-4.2.13 Silt Fence Installation by Slicing Method (p.374)for slicing
method details.Silt fence installation using the slicing method specifications:
1.The base of both end posts must be at least 2-to 4-inches above the top of
the filter fabric on the middle posts for ditch checks to drain properly.Use a
hand level or string level,if necessary,to mark base points before install -
ation.
2.Install posts 3-to 4-feet apart in critical retention areas and 6-to 7-feet apart
in standard applications.
3.Install posts 24-inches deep on the downstream side of the silt fence,and as
close as possible to the filter fabric,enabling posts to support the filter fabric
from upstream water pressure.
4.Install posts with the nipples facing away from the filter fabric.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 372
5.Attach the filter fabric to each post with three ties,all spaced within the top 8-
inches of the filter fabric.Attach each tie diagonally 45 degrees through the fil-
ter fabric,with each puncture at least 1-inch vertically apart.Each tie should
be positioned to hang on a post nipple when tightening to prevent sagging.
6.Wrap approximately 6-inches of fabric around the end posts and secure with
3 ties.
7.No more than 24-inches of a 36-inch filter fabric is allowed above ground
level.
Compact the soil immediately next to the filter fabric with the front wheel of
the tractor,skid steer,or roller exerting at least 60 pounds per square inch.
Compact the upstream side first and then each side twice for a total of four
trips.Check and correct the silt fence installation for any deviation before
compaction.Use a flat-bladed shovel to tuck fabric deeper into the ground if
necessary.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 373
Figure II-4.2.13 Silt Fence Installation by Slicing Method
D EPARTMENT OF
ECOLOGY
State of Washington
Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
limitation of liability, and disclaimer.
Figure II-4.2.13
Silt Fence Installation by Slicing Method
Revised November 2015
NOT TO SCALE
Completed Installation
Silt Fence
Post
installed
after
compaction
Vibratory plow is not acceptable because of horizontal compaction
Slicing blade
(18 mm width)
Horizontal chisel point
(76 mm width)
Fabric
above
ground
200 -
300mm
Roll of silt fenceOperation
No more than 24" of a 36"
fabric is allowed above groundSteel support post100% compaction 100% compaction
FLOW
Drive over each side of
silt fence 2 to 4 times
with device exerting 60
p.s.i. or greater
Attach fabric to
upstream side of post
Ponding height max. 24"
POST SPACING:
7' max. on open runs
4' max. on pooling areas
POST DEPTH:
As much below ground
as fabric above ground
Top of Fabric
Belt
top 8"
Diagonal attachment
doubles strength
Attachment Details:
x Gather fabric at posts, if needed.
x Utilize three ties per post, all within top 8"
of fabric.
x Position each tie diagonally, puncturing
holes vertically a minimum of 1" apart.
x Hang each tie on a post nipple and tighten
securely. Use cable ties (50 lbs) or soft
wire.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 374
Maintenance Standards
l Repair any damage immediately.
l Intercept and convey all evident concentrated flows uphill of the silt fence to a sed-
iment pond.
l Check the uphill side of the fence for signs of the fence clogging and acting as a
barrier to flow and then causing channelization of flows parallel to the fence. If this
occurs, replace the fence or remove the trapped sediment.
l Remove sediment deposits when the deposit reaches approximately one-third the
height of the silt fence, or install a second silt fence.
l Replace filter fabric that has deteriorated due to ultraviolet breakdown.
2014 Stormwater Management Manual for Western Washington
Volume II - Chapter 4 - Page 375
BMP C240:Sediment Trap
Purpose
A sediment trap is a small temporary ponding area with a gravel outlet used to collect
and store sediment from sites cleared and/or graded during construction.Sediment
traps,along with other perimeter controls,shall be installed before any land disturbance
takes place in the drainage area.
Conditions of Use
Prior to leaving a construction site,stormwater runoff must pass through a sediment
pond or trap or other appropriate sediment removal best management practice.Non-
engineered sediment traps may be used on-site prior to an engineered sediment trap or
sediment pond to provide additional sediment removal capacity.
It is intended for use on sites where the tributary drainage area is less than 3 acres,with
no unusual drainage features,and a projected build-out time of six months or less.The
sediment trap is a temporary measure (with a design life of approximately 6 months)and
shall be maintained until the site area is permanently protected against erosion by veget-
ation and/or structures.
Sediment traps and ponds are only effective in removing sediment down to about the
medium silt size fraction.Runoff with sediment of finer grades (fine silt and clay)will
pass through untreated,emphasizing the need to control erosion to the maximum extent
first.
Whenever possible,sediment-laden water shall be discharged into on-site,relatively
level,vegetated areas (see BMP C234:Vegetated Strip (p.375)).This is the only way to
effectively remove fine particles from runoff unless chemical treatment or filtration is
used.This can be particularly useful after initial treatment in a sediment trap or pond.
The areas of release must be evaluated on a site-by-site basis in order to determine
appropriate locations for and methods of releasing runoff.Vegetated wetlands shall not
be used for this purpose.Frequently,it may be possible to pump water from the col -
lection point at the downhill end of the site to an upslope vegetated area.Pumping shall
only augment the treatment system,not replace it,because of the possibility of pump fail -
ure or runoff volume in excess of pump capacity.
All projects that are constructing permanent facilities for runoff quantity control should
use the rough-graded or final-graded permanent facilities for traps and ponds.This
includes combined facilities and infiltration facilities.When permanent facilities are used
as temporary sedimentation facilities,the surface area requirement of a sediment trap or
pond must be met.If the surface area requirements are larger than the surface area of
the permanent facility,then the trap or pond shall be enlarged to comply with the surface
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 383
area requirement.The permanent pond shall also be divided into two cells as required
for sediment ponds.
Either a permanent control structure or the temporary control structure (described in BMP
C241:Temporary Sediment Pond (p.388))can be used.If a permanent control structure
is used,it may be advisable to partially restrict the lower orifice with gravel to increase
residence time while still allowing dewatering of the pond.A shut-off valve may be
added to the control structure to allow complete retention of stormwater in emergency
situations.In this case,an emergency overflow weir must be added.
A skimmer may be used for the sediment trap outlet if approved by the Local Permitting
Authority.
Design and Installation Specifications
l See Figure II-4.2.16 Cross Section of Sediment Trap (p.386)and Figure II-4.2.17
Sediment Trap Outlet (p.387)for details.
l If permanent runoff control facilities are part of the project,they should be used for
sediment retention.
l To determine the sediment trap geometry,first calculate the design surface area
(SA)of the trap,measured at the invert of the weir.Use the following equation:
SA =FS(Q2/Vs)
where
Q2 =Design inflow based on the peak discharge from the developed 2-year runoff event
from the contributing drainage area as computed in the hydrologic analysis.The 10-year
peak flow shall be used if the project size,expected timing and duration of construction,
or downstream conditions warrant a higher level of protection.If no hydrologic analysis
is required,the Rational Method may be used.
Vs =The settling velocity of the soil particle of interest.The 0.02 mm (medium silt)
particle with an assumed density of 2.65 g/cm3 has been selected as the particle of
interest and has a settling velocity (Vs)of 0.00096 ft/sec.
FS =A safety factor of 2 to account for non-ideal settling.
Therefore,the equation for computing surface area becomes:
SA =2 x Q2/0.00096
or
2080 square feet per cfs of inflow
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 384
Note:Even if permanent facilities are used,they must still have a surface area that is at
least as large as that derived from the above formula.If they do not,the pond must be
enlarged.
l To aid in determining sediment depth,all sediment traps shall have a staff gauge
with a prominent mark 1-foot above the bottom of the trap.
l Sediment traps may not be feasible on utility projects due to the limited work space
or the short-term nature of the work.Portable tanks may be used in place of sed-
iment traps for utility projects.
Maintenance Standards
l Sediment shall be removed from the trap when it reaches 1-foot in depth.
l Any damage to the pond embankments or slopes shall be repaired.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 385
Figure II-4.2.16 Cross Section of Sediment Trap
D E P A R T M E N T O F
E C O L O G Y
S t a t e o f W a s h i n g t o n
Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
limitation of liability, and disclaimer.
Figure II-4.2.16
Cross Section of Sediment Trap
Revised November 2015
NOT TO SCALE
3H
:
1
V
M
a
x
.
3.5' - 5'
Flat Bottom
1.5' Min.
1' Min.
Surface area determined
at top of weir
3 4" - 1.5"
Washed gravel
Geotextile
2" - 4" Rock
Rip Rap
Discharge to
stabilized
conveyance,
outlet, or level
spreader
4' Min.
1' Min.
1' Min.
Overflow
Note: Trap may be formed by berm or by
partial or complete excavation.
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 386
Figure II-4.2.17 Sediment Trap Outlet
D E P A R T M E N T O F
E C O L O G Y
S t a t e o f W a s h i n g t o n
Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions,
limitation of liability, and disclaimer.
Figure II-4.2.17
Sediment Trap Outlet
Revised November 2015
NOT TO SCALE
6' Min.
1' Min. depth overflow spillway
Native soil or
compacted backfill
Geotextile
Min. 1' depth 2" - 4" rock
Min. 1' depth 3 4" - 1.5"
washed gravel
2014 Stormwater Management Manual for Western Washington
Volume II -Chapter 4 -Page 387
Duvall Ave NeNe 9th St
Ne 8th St
Ne 7th St
Ne 6th St
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
RIGHT LANE
CLOSED
AHEAD
W20-5R
RIGHT LANE
CLOSED
AHEAD
W20-5R
RIGHT LANE
CLOSED
AHEAD
W20-5R
W4-2R
BIKES
MERGE WITH
TRAFFIC
Ne 10th St Ne 10th St
SIDEWALK CLOSED
AHEAD
CROSS HERE
R9-11(L)
All Signs & Spacing to conform to the MUTCD & The City of Renton Traffic Control Manual
N
* Place on Ne 12th St
Jobsite Address: Duvall Ave Ne at Ne 10th st
Contact: Sam Cormer (425)-765-0037
Work Hours: 6:30am to 5:30pm Mon-Sat
Working Days:
Type of Work: Utility crossings, Curb, Gutter,
Sidewalk, Pavement Patch
*PLAN NOT TO SCALE
*Signs, devices and spacing shall conform to the MUTCD
*Coordinate/facilitate driveway/load zone access
*Maintain 11' vehicle lane widths
*Priority access shall be provided to emergency vehicles
*Notify metro of bus route/stop impacts
*NOT TO SCALE
*Sign spacing may be reduced to fit road condirions
Legend
Arrowboard (Chevron)
Cone
SIDEWALK CLOSEDAHEAD
CROSS HERE R9-11(L) Sidewalk Closed Ahead, Cross Here R9-11(L)
SIDEWALK CLOSEDAHEAD
CROSS HERE R9-11(R) Sidewalk Closed Ahead, Cross Here R9-11(R)
ROAD
WORKAHEAD W20-1 Road Work Ahead
RIGHT LANECLOSEDAHEAD W20-5R Right Lane Closed Ahead
W4-2R
Work Area
Traffic Control Plan
P#
Plan #1
Keone Padilla
TCS#K142JW
Northwesttcps@gmail.com
206-471-0934
Date: 3-5-2021
TCP PG __1__ OF __3__
SIDEWALK CLOSED
AHEAD
CROSS HERE
R9-11(R)
www.invarion.com
Duvall Ave NeNe 10th St Ne 10th St
SIDEWALK CLOSEDAHEAD
CROSS HERE
R9-11(R)
All Signs & Spacing to conform to the MUTCD & The City of Renton Traffic Control Manual
N
Jobsite Address: Duvall Ave Ne at Ne 10th st
Contact: Sam Cormer (425)-765-0037
Work Hours: 6:30am to 5:30pm Mon-Sat
Working Days:
Type of Work: Utility crossings, Curb, Gutter,
Sidewalk, Pavement Patch
*PLAN NOT TO SCALE
*Signs, devices and spacing shall conform to the MUTCD
*Coordinate/facilitate driveway/load zone access
*Maintain 11' vehicle lane widths
*Priority access shall be provided to emergency vehicles
*Notify metro of bus route/stop impacts
*NOT TO SCALE
*Sign spacing may be reduced to fit road condirions
Legend
Arrowboard (Chevron)
Cone
SIDEWALK CLOSEDAHEAD
CROSS HERE R9-11(R) Sidewalk Closed Ahead, Cross Here R9-11(R)
ROADWORK
AHEAD W20-1 Road Work Ahead
RIGHT LANECLOSEDAHEAD W20-5R Right Lane Closed Ahead
W4-2 road narrows
Work Area
Traffic Control Plan
P#
Plan #2
Keone Padilla
TCS#K142JW
Northwesttcps@gmail.com
206-471-0934
Date: 3-5-2021
TCP PG __2__ OF __3__
Ne 12th St Ne 12th St
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
RIGHT LANE
CLOSED
AHEAD
W20-5R
RIGHT LANE
CLOSED
AHEAD
W20-5R
W4-2
BIKES
MERGE WITH
TRAFFIC
SIDEWALK CLOSED
AHEAD
CROSS HERE
R9-11(L)
www.invarion.com
Duvall Ave NeNe 10th St Ne 10th St
All Signs & Spacing to conform to the MUTCD & The City of Renton Traffic Control Manual
N
Jobsite Address: Duvall Ave Ne at Ne 10th st
Contact: Sam Cormer (425)-765-0037
Work Hours: 6:30am to 5:30pm Mon-Sat
Working Days:
Type of Work: Utility crossings, Curb, Gutter,
Sidewalk, Pavement Patch
*PLAN NOT TO SCALE
*Signs, devices and spacing shall conform to the MUTCD
*Coordinate/facilitate driveway/load zone access
*Maintain 11' vehicle lane widths
*Priority access shall be provided to emergency vehicles
*Notify metro of bus route/stop impacts
*NOT TO SCALE
*Sign spacing may be reduced to fit road condirions
Legend
Arrowboard (Chevron)
Cone
ROAD
WORKAHEAD W20-1 Road Work Ahead
LEFT LANECLOSEDAHEAD W20-5L Left Lane Closed Ahead
W4-2 road narrows
Work Area
Traffic Control Plan
P#
Plan #3
Keone Padilla
TCS#K142JW
Northwesttcps@gmail.com
206-471-0934
Date: 3-5-2021
TCP PG __3__ OF __3__
Ne 12th St Ne 12th St
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
LEFT LANE
CLOSED
AHEAD
W20-5L
Ne 9th St
ROAD
WORK
AHEAD
W20-1
ROAD
WORK
AHEAD
W20-1
LEFT LANE
CLOSED
AHEAD
W20-5L
W4-2
ROAD
WORK
AHEAD
W20-1
LEFT LANE
CLOSED
AHEAD
W20-5L
LEFT LANE
CLOSED
AHEAD
W20-5L
ROAD
WORK
AHEAD
W20-1
W4-2
www.invarion.com
Page i
Hazardous Materials Management
Spill Prevention, Control, and Countermeasure Plan
Table of Contents
SPCC Plan Implementation Requirements ..................................................................... 1
SPCC Plan Elements ...................................................................................................... 2
1. Responsible Personnel ........................................................................................... 2
2. Spill Reporting ........................................................................................................ 2
3. Project and Site Information ................................................................................... 4
4. Potential Spill Sources ............................................................................................ 5
5. Pre-Existing Contamination .................................................................................... 7
6. Spill Prevention and Response Training ................................................................. 8
7. Spill Prevention ....................................................................................................... 9
8. Spill Response ...................................................................................................... 10
Page 1
Spill Prevention, Control, and Countermeasures Plan Implementation
Requirements
The purpose of this Plan is to protect human health and the environment from spills and
releases of “hazardous materials,” a term used to mean dangerous waste, problem waste,
petroleum products, and hazardous substances. This Plan shall also address conditions that
may be required by Section 3406 of the current International Fire Code, or as approved by the
local Fire Marshal.
Page 2
SPCC Plan Elements
1. Responsible Personnel
Table 1.1 identifies the name(s), title(s), and contact information for the personnel responsible
for implementing and updating the SPCC Plan, and for responding to spills. If spill response
Subcontractor(s) will be used for spill response (as described in Section 8, Spill Response,
below), the Subcontractor(s) company name(s) and contact information are also included in
Table 1.1. Complete Table 1.
Table 1 Responsible Personnel
Responsibility Name and Title Contact Information
Implementing and Updating
SPCC Plan (primary
contact person)
Company:
Office Phone:
Cell Phone:
Implementing and Updating
SPCC Plan (secondary
contact person)
Company:
Office Phone:
Cell Phone:
On-Site Spill Responder
Company:
Office Phone:
Cell Phone:
On-Site Spill Responder
Company:
Office Phone:
Cell Phone:
2. Spill Reporting
Event: Hazardous Material Spill, Release or Encounter
If a spill or release is caused by the Contractor, the Contractor reports it to the regulatory
agencies as indicated below.
Spill or Release to
Water
Including ponds, wetlands, ditches,
& seasonally dry streams
Immediately call all
three of the following
24-hour numbers:
· National Response
Center
1-800-424-8802
· Washington State
Division of
Emergency
Management
1-800-258-5990
· Washington State
Department of
Ecology (Ecology)
Regional Office1
If an immediate threat to
health or environment
(e.g., explosive,
flammable, or toxic
vapors; nearby water
body; shallow
groundwater; etc.)
immediately call
Ecology’s Regional
Office1
If confirmed release from
UST, report to Ecology’s
Regional Office1 within 24
hours
After removal of regulated
USTs, provide reports to
Ecology’s Regional Office
within 20 and 30/90 days
per WAC 173-340 and
173-360.
If NOT an immediate
threat but may be a
threat to health or the
environment, report to
Ecology’s Regional
Office1 within 90 days
1 Ecology Regional Office Numbers
Eastern (Spokane): 509-329-3400 Northwest (Bellevue): 425-649-7000
Central (Yakima): 509-575-2490 Southwest (Lacey): 360-407-6300
Ecology regional lines and the type of information needed is provided on Ecology’s spill
reporting website at
http://www.ecy.wa.gov/programs/spills/other/reportaspill.htm
Spill or Release to Soil
Including encounters of pre-existing
contamination
Underground Storage
Tank (UST)
Encountering known or unknown
USTs in excavations
Page 4
3. Project and Site Information
Please describe the following items:
A. The Project work: (briefly describe the construction activities that will take place)
B. The site location and boundaries:
C. The drainage pathways from the site: (either provide information here or complete Table 3)
D. Nearby waterways and sensitive areas and their distances from the site: (either provide
information here or complete Table 3)
Either complete Table 3, below, or provide information above for 3.C and 3.D. and delete Table
3
Table 3 Nearby Waterways1 and Sensitive Areas2
Waterway1 or
Sensitive Area2
Distance from
Project Site
Direction of Flow
from Project Site
Runoff Drainage Pathway
from Site
(e.g., Derby Creek)
(e.g., 35 feet
east of Project
Site)
(e.g., downhill towards
the northeast)
(e.g., downhill to northeast from
the Project staging area to the
lower reach of Derby Creek)
(e.g., Milwaukee Ditch) (e.g., 350 feet
south of Project
site)
(e.g., across the
pavement to the east)
(e.g., across the pavement east of
the roundabout, into the catch
basin, and into Milwaukee Ditch)
Notes:
1 Waterways include streams, creeks, sloughs, rivers, Puget Sound, etc.
2 Sensitive areas are areas that typically contain populations that could be particularly sensitive to a hazardous
materials spill or release. Such areas include wetlands, areas that provide habitat for threatened or endangered
species, nursing homes, hospitals, child care centers, etc. Sensitive areas also include areas where
groundwater is used for drinking water, such as wellhead protection zones and sole source aquifer recharge
areas.
Page 5
4. Potential Spill Sources
A description of each potential fuel, petroleum product and other hazardous material brought or
generated on-site is set forth in Table 4.1. The potential fuel, petroleum product and other
hazardous materials listed on Table 4.1 include materials used for operating, refueling,
maintaining, and cleaning equipment - including equipment used below the ordinary high water
line. Complete Table 4, listing information for EACH fuel, petroleum product and hazardous
material.
Page 6 Table 4 Fuel, Petroleum Product and other Hazardous Materials Brought or Generated On-Site Hazardous Material Name Intended Use of Material Est. Max. Amount of Material On-Site at Any One Time Material Staging, Use, and Storage Location(s), & Material Storage and Secondary Containment Practices and Structures, in accordance with Element 71 Distance of Material Staging, Use, and Storage Locations from Nearby Waterways2 and Sensitive Areas3 (e.g., gasoline, diesel, motor oil, hydraulic oil, cleaning solvent, paint) Notes: 1 See also Section 7 (Spill Prevention, secondary containment and structures should be described in Table 4 and under Section 7D). 2 Waterways include streams, creeks, sloughs, rivers, Puget Sound, etc. 3 Sensitive areas are areas that typically contain populations that could be particularly sensitive to a hazardous materials spill or release. Such areas include wetlands, areas that provide habitat for threatened or endangered species, nursing homes, hospitals, child care centers, etc. Sensitive areas also include areas where groundwater is used for drinking water, such as wellhead protection zones and sole source aquifer recharge areas.
Page 7
5. Pre-Existing Contamination
* Describe any pre-existing contamination and contaminant sources (such as buried pipes,
buried tanks, buried drums or other buried containers) in the Project area that are described
in the Contract documents; and
* Identify equipment and work practices that will be used to prevent the release of
contamination.
- if no pre-existing contamination or contaminant sources -
are described in the Contract documents, write “N/A”
Example: Soil contaminated with petroleum products is suspected of existing near the
southeast corner of the intersection of SR 99 and Cordane Street. If soil that is
suspected of being contaminated is encountered, it will be stockpiled in the vicinity of the
excavation for characterization sampling and determination of disposal options. Soil that
is suspected of being contaminated will be stockpiled separately from soil showing no
indication of contamination. Soil that is suspected of being contaminated will be
stockpiled on an impervious surface and will be set up to allow for ease of sampling and
load-out once characterization is complete. Stockpiles of suspected contaminated soil
will be covered with plastic sheeting when not being worked; stormwater that could run
into the base of such stockpiles will be diverted from the area.
**If a Project-specific soil management plan (SMP), water management plan (WMP), temporary
erosion and sediment control (TESC) plan, contaminated media management plan (CMMP) or
other plan concerning contaminated materials has been prepared for known SPCC-related
Project conditions, please briefly refer to them here and attach final versions to this Plan.
Page 8
6. Spill Prevention and Response Training
Describe how and when all Project personnel (including refueling personnel and other
subcontractors) shall be trained in spill prevention, containment, and response, and the location
of spill response kits.
Page 9
7. Spill Prevention
A. Spill response kit contents and location(s) (see Table 7). Appropriately stocked spill
response kits shall be maintained in close proximity to hazardous materials and equipment
and shall be immediately accessible to all Project personnel. Complete Table 7.
Table 7 Spill Response Kit Contents and Locations
Type of Spill Kit Spill Kit Contents Spill Kit Location(s)
(e.g. vehicle kit,
drum kit, conex kit)
(e.g., air horn to get attention of those
working nearby, personal protective
equipment (PPE, such as safety glasses,
gloves, coveralls, boot covers), spill pads,
absorbent, booms, catch basin covers,
anti-static shovels, garbage bags, plastic
sheeting, overpack or disposal drum,
complete copy of SPCC Plan, etc.)
(e.g., adjacent to in-water work,
on bridge ramp, within 1,000’ of
active construction areas, next to
Honey Buckets, on large
equipment, outside main job
trailer, in staging area conex, on
mitigation site, below north end of
bridge, etc.)
B. Security measures for potential spill sources. The staging area will be surrounded by a
secured fence, hazardous materials will be stored inside a locked storage shed.
C. Methods used to prevent stormwater from contacting fuel, petroleum products and
hazardous materials. Contaminated soil will be placed on bermed plastic and covered.
D. Secondary containment for each potential spill source listed in Section 4, above.
· Secondary containment structures shall be in accordance with Section S9.D.9
(http://www.ecy.wa.gov/programs/wq/stormwater/construction/permitdocs/cswgppermit1
20110.pdf) of Ecology’s Construction Stormwater General NPDES Permit, where
secondary containment means placing tanks or containers within an impervious
structure capable of containing 110% of the volume contained in the largest tank within
the containment structure.
E. Best Management Practices (BMP) Methods used to prevent discharges to ground or water
during mixing and transfers of hazardous materials, petroleum product and fuel.
F. Refueling procedures for equipment that cannot be moved from below the ordinary high
water line. Describe these procedures. Write N/A if no work will be performed below the
ordinary high water line.
G. Daily inspection and cleanup procedures that ensure all equipment used below the ordinary
high water line is free of all external petroleum-based products. Describe these procedures.
Write N/A if no work will be performed below the ordinary high water line.
H. Daily equipment, storage area, and structure inspection will be conducted to prevent drips,
leaks or failures of hoses, valves, fittings, containers, pumps, or other systems that contain
or transfer hazardous materials.
Page 10
8. Spill Response
Tables 8A and 8B, below, outline the response procedures that the contractors shall follow for
the scenarios described in the tables below, indicating that if hazardous materials are
encountered or spilled to soil or water (including stormwater, as described in Section 7C) during
construction, the contractor shall do everything possible to control and contain the material until
appropriate measures can be taken.
Page 11 Table 8A Spill Response Procedures, Including Actions to be Taken and Equipment to be Used Hazardous Material and Location Spill Response Task Assess the Spill Secure the Area Contain and Eliminate the Spill Source Clean Up Spilled Material Decontaminate Equipment Dispose of Spilled & Contaminated Material1 (e.g., identify each fuel, petroleum product and hazardous material listed in Section 4, stormwater that has come into contact with hazardous material, pre-existing contamination or contaminant sources, and unknown pre-existing contamination or contaminant sources. Exception: complete Table 8B for spills occurring during work below the Ordinary High Water Line) (e.g., include in this or other columns a description of the internal, emergency assistance, WSDOT, and agency notifications that will be made as part of the response procedures, referencing and adding to Table 2.1 as appropriate) (e.g. identify which area will be secured and how the area will be secured) (e.g. identify how the spill source will be contained and eliminated during spill response) (e.g., Identify how the spill will be cleaned up whether in soil or water, including stormwater that has contacted petroleum product, fuel or a hazardous material). Explain how the spilled material and all cleanup supplies will be disposed of; describe documentation substantiating such disposal that will be provided to the WSDOT PE and when it will be provided. Notes: 1 Spilled fuel, petroleum product and hazardous materials, contaminated stormwater, contaminated soil and water, and all cleanup supplies shall be transported off site for disposal at a facility approved by the Department of Ecology. No potentially hazardous materials, contaminated soil or water, or cleanup supplies may be discharged to any sanitary sewer without approval of the local sewer authority. Contaminated stormwater will not be discharged to any sanitary sewer without approval of the local sewer authority. Petroleum products, fuel, and hazardous material spills shall be addressed and shall be prevented from reaching storm drains or other discharge points. It is acceptable to combine materials covered by the same response procedures, as long each material is clearly identified.
Page 12 Table 8B Spill Response Procedures for Spills Occurring During Work with Equipment Used Below the Ordinary High Water Line (Including Actions to be Taken and Equipment to be Used) Hazardous Material and Location Spill Response Task Assess the Spill Secure the Area Contain and Eliminate the Spill Source Clean Up Spilled Material Decontaminate Equipment Dispose of Spilled & Contaminated Material1 (e.g., identify each fuel, petroleum product and hazardous material to be used below the ordinary high water mark) (e.g., include in this or other columns a description of the internal, emergency assistance, WSDOT, and agency notifications that will be made as part of the response procedures, referencing and adding to Table 2.1 as appropriate) (e.g. identify which area will be secured and how the area will be secured) (e.g. identify procedures on how the spill source will be contained and eliminated during spill response) (e.g., Identify how the spill will be cleaned up whether in soil or water, including stormwater that has contacted petroleum product, fuel or a hazardous material). Explain how the spilled material and all cleanup supplies will be disposed of; describe documentation substantiating such disposal that will be provided to the WSDOT PE and when it will be provided. Notes: 1 Spilled fuel, petroleum product and hazardous materials, contaminated stormwater, contaminated soil and water, and all cleanup supplies shall be transported off site for disposal at a facility approved by the Department of Ecology. No potentially hazardous materials, contaminated soil or water, or cleanup supplies may be discharged to any sanitary sewer without approval of the local sewer authority. Contaminated stormwater will not be discharged to any sanitary sewer without approval of the local sewer authority. Write N/A if no equipment will be used below the ordinary high water line and delete the following table (but not the table title, above).
SPCC Plan Acknowledgement Form (to be signed by all Project personnel)
This is to certify that I have read this Project SPCC Plan and understand its contents. I
have attended a Project orientation meeting discussing the elements of this SPCC Plan
and the safety and health hazards associated with SPCC operations to be performed at
this Project. Failure to comply with the requirements contained in this SPCC Plan may
result in my removal from the Project.
PRINT NAME SIGNATURE DATE