The SWPPP must include the following components:
•
A description of the construction activities
and the potential for sediment and other pollutant discharges from the site.
•
Maps showing the locations of all surface
waters, including wetlands, stormwater ponds or basins within one mile of the
site.
•
Areas of the site that will drain to a
public water the Department of Natural Resources has promulgated “work in water
restrictions” for fish spawning timeframes.
•
A determination whether surface waters
within one mile of the site are special or impaired for one of the
construction-related parameters and additional or enhanced BMPs that will be
utilized to address the special or impaired waters.
•
Stormwater pollution mitigation measures to
be utilized as a result of an environmental review.
•
Additional measures needed at the site to
address karst or drinking water supply management areas.
•
Training documentation for all individuals
required to be trained in associated duties in regard to the SWPPP.
•
A site map showing both the existing and
final grades, including direction of flow and pre and post drainage area
divides. The site map must also include locations of steep slopes, impervious
surfaces, soil types, and pollutant-generating activities (building products,
pesticides, herbicides, fertilizer, treatment chemicals, hazardous materials,
solid waste, portable toilets, etc.).
•
Estimated quantities of all erosion
prevention and sediment control BMPs to be used for the life of the project.
•
Stormwater design specifications and
calculations for stormwater management systems, including the number of acres
of existing and new impervious surfaces.
The
following factors must be accounted for in design of BMPs to be used at the
site:
•
the amount, frequency, intensity and
duration of precipitation.
•
stormwater runoff and run-on and expected
flow from impervious surfaces.
•
slope lengths and steepness, the site
location and drainage features.
•
flow rate and volume of channelized flow.
•
soil types.
•
Timing of installation for all erosion
prevention and sediment control BMPs and permanent stormwater management
systems.
•
Location and type of all permanent and
temporary erosion prevention and sediment control BMPs to be installed at the
site along with procedures to establish additional BMPs as necessary.
•
A description of methods to be used for
site dewatering and basin draining.
•
Areas not to be disturbed on the site,
including the location of buffer zones.
•
Locations of areas to be phased to minimize
duration of exposed soils.
•
Methods to minimize soil compaction and
preserve top soil at the site.
•
Methods used to achieve final
stabilization.Image Courtesy of Emmons & Olivier Resources, Inc.
The
NPDES permit requires that all erosion and sediment BMPS be clearly outlined in
a site’s SWPPP. Changes made throughout construction should be documented in
the SWPPP.
•
Documentation why certain design
requirements or SWPPP
components are not feasible and the methods to be substituted as allowable by
the permit.
•
A maintenance plan for permanent stormwater
treatment systems, including who will maintain the system.
•
A description of pollution prevention
measures for storage, handling and disposal of hazardous materials, solid
waste, concrete and equipment wash water, portable toilets, construction
products and materials.
•
Plans for proper use of sediment treatment
chemicals (polymers, flocculants, etc.).
•
A description of inspection and maintenance
activities and record keeping.
•
Procedures for terminating permit coverage.
Author - Bio
It
is very important to understand the necessary components of SWPPP so as to
prepare and implement an effective SWPPP
plan. Quest Consultants & Associate’s SWPPP Professionals all have the
expertise to assist clients in better understanding all aspects of SWPPP
management through onsite training and education services. Please visit http://www.questinc2.com/for
more complete details on SWPPP.
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