Erosion and Sedimentation Control Presentation - Pennsylvania ...

lameubiquityMechanics

Feb 21, 2014 (3 years and 5 months ago)

71 views

EROSION & SEDIMENTATION
CONTROL

WORKSHOP

Cameron County Conservation District

Chapter 102 Rules and
Regulations


Erosion is natural, so what’s the deal?



Accelerated Erosion is not natural


man’s
activities in moving earth increase natural
erosion rates.



Runoff from construction activities carry
organic and inorganic materials into receiving
streams.

Chapter 102 Rules and
Regulations


Pennsylvania Clean Streams Law


Federal Clean Water Act


Chapter 102

Erosion Control


National Pollutant Discharge Elimination
System (NPDES)


Federal Environmental Protection Agency
(EPA) Court Decisions


Pennsylvania Dept. of Environmental
Protection (PA DEP) Court Decisions

Chapter 102 Rules and
Regulations


Earthmoving (construction activities) shall be
conduct in such a way as to prevent
accelerated erosion and resulting
sedimentation.



A landowner, person or municipality engaged
in earthmoving shall develop, implement and
maintain erosion and sedimentation (E&S)
control measures.


Chapter 102 Rules and
Regulations


E&S measures shall be set forth (illustrated or
demonstrated) in an erosion and
sedimentation control plan (E&S Plan).



Agricultural is
not

excluded from this
regulation! Plowing and tilling is covered, but
the demonstration or illustration is termed
“conservation plan.”

Chapter 102 Rules and
Regulations


Any construction activity disturbing 5000
-
square feet requires a written plan.



Any c0nstruction activity (defined by EPA) for
commercial, residential, or industrial
development having a “point source
discharge” is required to obtain a NPDES
Permit for the Discharge of Stormwater
Associated with Construction Activities.”

Chapter 102 Rules and
Regulations


Okay, what’s a “ point source discharge?”



Through the Federal Clean Water Act, EPA
defines a point source a discernible, discreet
discharge to a surface or non
-
surface water.



A surface water is any swale, ditch or channel,
man
-
made or natural. And basically, a non
-
surface water is anything else.

Chapter 102 Rules and
Regulations


What goes into an E&S Plan:


-

Topographic Features


-

Types, depths, slopes and extent of soils


-

Proposed earthmoving


-
Amount of runoff from upstream area and
construction activity


-
Staging (squence) of construction activity


-
Permanent and temporary E&S Controls


Chapter 102 Rules and
Regulations


What goes into an E&S Plan:



-

MAINTENANCE …..!!!!!


E&S Controls are installed an forgotten.


Most
approved

E&S Plans perform well, but
lack of maintenance ensures problems for
contractor, owner and compliance agencies.

Chapter 102 Rules and
Regulations


What are E&S Controls?


-

Limiting exposed earth


-

Diverting clean water around work area


-

Control velocity in channels (1.5
-
feet per second)


-

Stabilization of slopes, channels, ditches or other
disturbed areas as soon as possible.


-

Temporary seeding and mulching


-

Collecting and treating construction runoff


-

Removal of solids before discharge

Chapter 102 Rules and
Regulations

C0ntrol Facilities:


-

Diversion Terraces



Temporary terraces = 1.6 CFS



Permanent terraces = 2.75 CFS


-

Channels



Velocity = 1.5 FSP



Rock
-
lined or vegetation

Chapter 102 Rules and
Regulations


Sedimentation Basins:


-

7,000
-
cubic feet per acre of project


-

sediment storage of 5000
-
cubic per acre


-

Outlets designed to pass 2
-
cubic feet per
acre


-

basin must discharge to natural waterway


-

basin must be structurally sound

Chapter 102 Rules and
Regulations


How does Cameron County Conservation
District fit into this?


Chapter 102, Section 102.41 (Administration):



-

PA DEP may delegate the administration
and enforcement of this Chapter to counties
or other unit of local government, provided
the unit is approved and qualified by the
Department

Chapter 102 Rules and
Regulations


Federally required NPDES Permits are tied
into Chapter 102.


NPDES Permits are specifically covered by
Chapter 92 Rules and Regulations


Impetus for E&S Plans and Stormwater
Management is Water Quality….!!!!