Description
SWPPPs & BMPs:
What You Need to Know in the Field
about The Rules
WHY ARE WE HERE?
In 1969, the Cuyahoga River in Cleveland caught fire?for the twelfth time.
HISTORICAL PERSPECTIVE
?
1970: EPA was established on December 2, 1970
to consolidate in one agency a variety of federal
research, monitoring, standard-setting and
enforcement activities to ensure environmental
protection.
?
1972: The basis of the CWA was enacted in 1948
and was called the Federal Water Pollution Control
Act. The act was significantly reorganized and
expanded in 1972 and became known as the
“Clean Water Act?.
FUN FACT: In 1967, Sweden became the first country in the world to
establish an ?EPA?.
CLEAN WATER ACT
?
The Clean Water Act (CWA) establishes the basic
structure for regulating discharges of pollutants into
the waters of the United States and regulating quality
standards for surface waters.
?
The CWA made it unlawful to discharge any pollutant
from a point source into navigable waters, unless a
permit was obtained.
?
EPA’s NPDES permit program was mandated by
Congress under the CWA to regulate discharges.
NPDES
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
?
Stormwater discharges were originally exempted from
the NPDES program.
?
In 1987, Congress amended the CWA to require
NPDES permits for stormwater discharges.
?
Regulations for discharge of stormwater from large
construction sites (larger than 5 acres) were issued in
1990.
?
In 1999, the rules were amended to apply to all sites
larger than 1 acre.
THE CONSTRUCTION GENERAL
PERMIT
?
California is authorized to administer the federal
NPDES stormwater permitting program via the
Construction General Permit, aka the CGP, or The
Permit, or General Permit for Discharges of Storm
Water Associated with Construction Activity, NPDES
No. CAS000002.
?
The original CGP was issued in 1999 as Water Quality
Order 99-08-DWQ.
?
The original CGP was superseded in July 2010 by
2009-0009-DWQ which made significant changes.
?
Minor changes were made in 2011 and 2012.
WHAT?S A SWPPP?
?
A Storm Water Pollution Prevention Plan (SWPPP) is
the document that
?
Is filed with the State Water Resources Control
Board
?
Describes how we intend to comply with the
Construction General Permit (CGP) at a given site.
? Risk Determination (Homework Question 1!)
? BMP Selection (Homework Question 2!)
? Monitoring and Reporting Requirements
? Identifies responsible parties
THE PERMIT IS RISK-BASED
?
SEDIMENT RISK: Likely amount of sediment produced (yield)
? Determined by RUSLE: Revised Universal Soil Loss Equation
? Based on
? Duration of project & location of site
? Quality of soil
COMBINED RISK LEVEL MATRIX
? Slope
Sediment Risk
Medium
?
The project risk level determines
sampling and reporting
requirements
Low
RECEIVING WATER RISK:
Proximity to protected waterway
High
?
Receiving Water
Risk
Low
Level 1
Level 2
High
Level 2
Level 3
HOMEWORK QUESTION 1
Determine Risk Level for a project site.
?
Sediment Risk
? Find R, K, LS
? Calculate Sediment Yield
?
Receiving Water Risk
? 303(d) list
? Cold/Migratory/Spawning
SEDIMENT RISK
?
Sediment Yield = R x K x LS, where
? R: Site Rainfall/Runoff Factor
o
o
?
?
?
Project start and end dates
Site location (latitude & longitude)
K: Soil Erodibility Factor (soil type)
LS: Site slope length/gradient Factor (site topography)
Sediment Risk Levels based on Sediment Yield:
? Low Risk: < 15 tons/acre
? Medium Risk: >=15 and = 75 tons/acre
*Site acreage is NOT a factor in determining risk, unless the site is =15 and = 75 tons/acre
?
RECEIVING WATER RISK
RECEIVING WATER (RW) RISK FACTOR WORKSHEET
A. Watershed Characteristics
A.1.(a) Does the disturbed area discharge directly or indirectly to a 303(d)
listed waterbody impaired by sediment?
OR
A.1.(b) Is the disturbed area located within a sub-watershed draining to a
303(d) listed waterbody impaired by sediment?
OR
A.2. Is the disturbed area located within a planning watershed draining to
a waterbody with designated beneficial uses of COLD, SPAWN AND
MIGRATORY?
CALTRANS MAP
Impaired by
Sediment?
Cold,
Migratory, &
Spawning?
PROJECT RISK LEVEL
Combined Risk Level Matrix
Receiving Water
Risk
Sediment Risk
Low
Low
High
Medium
High
Level 2
Level 1
Level 2
Level 3
Project Sediment Risk:
Project RW Risk:
Medium
Low
Project Combined Risk:
Level 2
2
1
BACK TO THE PERMIT
The permit requires us to:
?
?
?
?
Install BMPs
Inspect BMPs
Maintain BMPs
Repair BMPs
to control erosion, reduce sediment, and protect
the environment.
* BMP = Best Management Practice?
THE PERMIT
?
Requires us to address (include in our SWPPP):
?
TRASH
?
DUST
?
FUEL SPILLS
?
CONCRETE WASTE
?
STOCKPILES
?
Activities we engage in everyday, all year
long?not just when its raining.
SWPPP REQUIREMENTS
SWPPPs must include Site Maps that show:
? Project surrounding area (vicinity map)
? Construction site boundaries
? Drainage areas
? Discharge and sampling locations
? Location of sensitive habits or waterways
? Locations of ALL BMPS*
* I sense a homework question coming?
SITE MAP EXAMPLES
STATION 7 LOCATION MAP
STATION 7 BMPs
STATION 11 LOCATION MAP
STATION 11 BMPs
HOMEWORK QUESTION 2
Identify and locate on the
plan sheet the following
BMPs for the project site:
? Sediment Control
? Erosion Control
? Tracking Control
? Wind Erosion Controls
? Non-stormwater Controls
? Waste Management
BMPs:
BEST MANAGEMENT PRACTICES
?
Erosion Controls* (15)
?
Sediment Controls* (14)
?
Wind Erosion Controls (1)
?
Tracking Controls (3)
?
Non-stormwater Controls (16)
?
Waste Management (10)
*TEMPORARY STRUCTURAL CONTROLS
BMP FACT SHEETS
Every BMP has a Fact Sheet
?
Description and Purpose
?
Suitable applications
?
Limitations
?
Implementation/Material Selection
Criteria
?
Installation Details / Diagrams
?
Costs
?
Inspection and Maintenance
?
References
EROSION CONTROLS
This image cannot currently be displayed.
The goal of Erosion
Controls is to:
?
keep soil in place
?
keep rain from
hitting the soil
?
prevent flow
concentration
EROSION CONTROL BMPS
EC-1
SCHEDULING
EC-6
STRAW MULCH
EC-11
SLOPE DRAINS
EC-2
PRESERVE EXISTING
VEGETATION
EC-7
GEOTEXTILES & MATS
EC-12
STREAMBANK
STABILIZATION
EC-3
HYDRAULIC MULCH
EC-4
HYDROSEEDING
EC-5
SOIL BINDERS
EC-8
WOOD MULCHING
EC-9
EARTH DIKES &
DRAINAGE SWALES
EC-10
VELOCITY DISSIPATION
DEVICES
EC-14
COMPOST BLANKET
EC-15
SOIL PREPARATION/
ROUGHENING
EC-16
NON-VEGETATIVE
STABILIZATION
EC-7 GEOTEXTILES
?
For steep slopes
(H:V>3:1)
?
Slopes with high
erosion potential
?
Disturbed areas
where plants are
slow to develop
?
Can be natural or
synthetic
EC-7 GEOTEXTILES
EC-9 DRAINAGE SWALES
EC-15 SOIL
PREPARATION/ROUGHENING
SEDIMENT CONTROLS
The goal of
Sediment Controls
is to:
? Keep soil out of
storm drains
? Slow it down
? Allow it to
settle
? ?Slow it, spread
it, soak it in?
SEDIMENT CONTROL BMPS
SE-1
SILT FENCE
SE-2
SEDIMENT BASIN
SE-3
SEDIMENT TRAP
SE-4
CHECK DAM
SE-5
FIBER ROLLS
SE-6
GRAVEL BAG BERM
SE-7
STREET SWEEPING &
VACUUMING
SE-8
SAND BAG BARRIER
SE-9
STRAW BALE BARRIER
SE-10
STORM DRAIN INLET
PROTECTION
SE-11
ACTIVE TREATMENT
SYSTEMS
SE-12
TEMPORARY SILT DIKE
SE-13
COMPOST SOCKS AND
BERMS
SE-14
BIOFILTER BAGS
SE-1 SILT FENCE
? Not for use on slopes or
where flows are
concentrated
? Must be trenched and
keyed in
? Should be used with upslope erosion controls.
SE-1 SILT
FENCE
SE-1 SILT FENCE
SE-4 CHECK DAM
SE-4 CHECK DAM
SE-4 CHECK DAM
SE-5 FIBER ROLLS
SE-5 FIBER ROLLS
? Not effective unless
trenched in and
staked.
? Limited capture zone.
? Not for use in high
flow situations.
? Install on level
contours;
? Maximum spacing is
based on slope. E.g.
at 2:1 (H:V) spacing
is 10 ft max.
SE-5 FIBER ROLLS
SE-7 STREET SWEEPING &
VACUUMING
SE-10 STORM DRAIN INLET
PROTECTION
SE-10 STORM DRAIN INLET
PROTECTION
SE-10 STORM DRAIN INLET
PROTECTION
SE-10 STORM DRAIN INLET
PROTECTION
WE-1 WIND EROSION
CONTROLS
WE-1 WIND EROSION/DUST
CONTROL
WE-1 WIND EROSION/DUST
CONTROL
TRACKING CONTROL BMPS
?
TC-1:
Stabilized
Entrance
/Exit
?
TC-2:
Stabilized
Roadway
?
TC-3:
Tire Wash
TC-1 STABILIZED ENTRANCE/EXIT
TC-1
STABILIZED
ENTRANCE
/EXIT
TC-1
STABILIZED
ENTRANCE
/EXIT
TC-3 TIRE WA$H
NON-STORMWATER BMPS
o NS-1: Water Conservation Practices
o NS-9: Vehicle/Equipment Fueling
o NS-2: Dewatering Operations
o NS-10: Vehicle/Equipment Maintenance
o NS-3: Paving & Grinding Operations
o NS-11: Pile Driving Operations
o NS-4: Temporary Stream Crossing
o NS-12: Concrete Curing
o NS-5: Clear Water Diversion
o NS-13: Concrete Finishing
o NS-6: Illicit Connection/ Discharge
o NS-14:
o NS-7: Potable Water/Irrigation
o NS-15: Demolition Adjacent to Water
o NS-8: Vehicle/Equipment Cleaning
o NS-16: Temporary Batch Plants
Material/Equipment Use Over
Water
NS-3 PAVING
& GRINDING
?
?
?
Shovel or vacuum sawcut slurry and remove
from site.
Cover or barricade storm
drains during saw cutting
to prevent slurry from
entering storm drains.
Residue from grinding
operations should be
picked up by a vacuum
attachment. It should
not be allowed to flow
across the pavement or
left on the pavement
surface.
NS-6 ILLICIT DISCHARGE
? Refers to discharges and
dumping caused by someone
other than the contractor.
? Notify the Owner (LRP) as
soon as possible.
NS-8 VEHICLE & EQUIPMENT
CLEANING
? Use phosphate-free
biodegradable soaps
? Do not permit steam
cleaning
? Use high pressure sprayer
? On paved and bermed areas
only
? Provide sump to allow collection
and disposal of washwater
NS-12 CONCRETE CURING
? Avoid overspray
? Minimize drift
? Protect drain inlets
WASTE MANAGEMENT BMPS
?
WM-1: Material Delivery & Storage
?
WM-2: Material Use
?
WM-3: Stockpile Management
?
WM-4: Spill Prevention & Control
?
WM-5: Solid Waste Management
?
WM-6: Hazardous Waste Management
?
WM-7: Contaminated Soil Management
?
WM-8: Concrete Waste Management
?
WM-9: Sanitary & Septic Waste Management
?
WM-10: Liquid Waste Management
WM-1 MATERIAL DELIVERY &
STORAGE
Chemicals must be stored in water-tight
containers with appropriate secondary
containment or in a storage shed.
? Use containment pallets.
? Materials should be stored in their original
containers with the original product label.
? Materials should be covered prior to and during
rain events.
? Temporary containment facilities should be
maintained free of accumulated rainwater and
spills. These liquids should be collected and
placed into drums for disposal as hazardous
waste.*
(*unless testing determines them to be nonhazardous)
?
WM-1 MATERIAL DELIVERY &
STORAGE
WM-1 MATERIAL DELIVERY &
STORAGE
WM-2 MATERIAL USE
?
Do not remove original
product labels.
?
Mix paint in a containment
area.
?
Never clean paintbrushes or
rinse pain containers into a
street, gutter, storm drain or
watercourse.
?
Provide containment for
material use areas such as
masons? areas or paint
mix/prep areas.
WM-2 MATERIAL USE
WM-3 STOCKPILE MANAGEMENT
?
This is a year-round
requirement.
?
?All stockpiles are
required to be
protected
immediately if they
are not scheduled to
be used with 14
days.?
?
Protect all stockpiles
from stormwater runon.
WM-3 STOCKPILE MANAGEMENT
WM-4 SPILL
PREVENTION
WM-5 SOLID WASTE
MANAGEMENT
? Designated waste
collection areas
? Dumpsters must
be water-tight
? Cover waste
containers at the
end of every
workday and when
it is raining
? Don?t put
hazardous waste
in the regular trash
WM-8 CONCRETE WASTE
MANAGEMENT
?
Can be above grade
or below grade
?
Must be lined with
plastic
?
Must have a sign
?
Must be cleaned out
when 75% full
WM-8 CONCRETE WASTE
MANAGEMENT
? Washout containers must be
water-tight.
WM-8 CONCRETE WASTE
MANAGEMENT
WM-9 SANITARY/SEPTIC WASTE
MANAGEMENT
? Located away from
drainage facilities
and traffic
? Equipped with
secondary
containment
? Serviced regularly
to prevent spills
WM-9 SANITARY/SEPTIC WASTE
MANAGEMENT
PERIMETER CONTROLS
?
?
The Permit also requires us to
control the site perimeters:
? Run-on: Keep off-site
rainwater from entering
your work site.
? Run-off: The only thing
that should leave the work
site is clear water.
There is no BMP called
?Perimeter Controls?
HOMEWORK QUESTION 2
Identify and locate on the
plan sheet the following
BMPs for the project site:
? Sediment Control
? Erosion Control
? Tracking Control
? Wind Erosion Controls
? Non-stormwater Controls
? Waste Management
Questions?
Part 1: Types of Loads on Temporary Structures
1. Name at least 3 sources of forces on Temporary Structures.
2. How does the water table affect pressure on a Support of Excavation (SOE)?
3. Explain the difference between the two moment formulas wL2/8 and wL2/10 and draw
shear and moment diagrams
4. If a 25 ft column was pinned at the top and bottom, what would its effective unsupported
length if ft be?
5. If the same column presented in the previous question (25 ft column) is encased in
concrete at the bottom (fixed) and pinned at the top, what would its effective length
be? Briefly explain the reasoning behind the value found compared the answer
calculated in the previous problem.
Part 2: SWPPP
Using the Gobernadora Basin Plan sheet (found under Assignment 2) and the
information below answer the following questions.
Given:
Project: Gobernadora Multipurpose Basin
Schedule: Start 9/27/14, End 5/30/15
Location: Latitude= 33.55777, Longitude: -117.58861
Required:
1. Determine the Risk Assessment for project site.
2. Identify and locate on the plan sheet the following BMPs for the
project site:
a. Sediment Control
b. Erosion Control
c. Tracking Control
d. Wind Erosion Controls
e. Non-stormwater Controls
f. Waste Management
6. Question: Identify the rainfall erosivity factor (R).
7. Identify the soil erodibility factor K.
8. Determine the site slope length/gradient Factor LS.
9. Calculate the sediment risk factor in tons of sediment/acre.
10. Identify and locate on the plan sheet sediment control BMPs. List the BMPs below and
briefly describe your reasoning for where the BMPs are located.
11. Identify and locate on the plan sheet erosion control BMPs. List the BMPs below and briefly
describe your reasoning for where the BMPs are located.
12. Identify and locate on the plan sheet tracking control BMPs. List the BMPs below and briefly
describe your reasoning for where the BMPs are located.
13. Identify and locate on the plan sheet wind erosion control BMPs. List the BMPs below and
briefly describe your reasoning for where the BMPs are located.
14. Identify and locate on the plan sheet non-stormwater control BMPs. List the BMPs below and
briefly describe your reasoning for where the BMPs are located.
15. Identify and locate on the plan sheet waste management BMPs. List the BMPs below and
briefly describe your reasoning for where the BMPs are located.
Purchase answer to see full
attachment
