FLOOD04935

• County: Statewide
• Basin: Statewide
• Title: Storm Water Management for Constructed Activities
• Date: 9/1/1992
• Prepared By: EPA
• Floodplain - Doc Type: Educational/Technical/Reference Information

Chapter 2-Storm Water Pollution Prevention Plan

2.1

SITE EVALUATION AND DESIGN
DEVELOPMENT

SrTE EVALUAT10N ....ND DE~GN DEVELOPMENT

~

. Collect sit. ,ntormatlon
.Oeyelop sll.plan
. Prepare poUutlon preyenl>on Sit. map

The first phase in a preparing a Storm Water
Pollution Prevention Plan for a construction project
is to define the characteristics of the site and of
the type of construl=tion which will be occurring.
This phase is broken down into three tasks: collect
site information. develop site plan. and prepare site
map. The following. su bsections describe each of
these tasks.

+

ASSESSMENT

t

CONTROL SE..ECTlON/PlAN DESIGN

CERTIFICATION AND NOTIFICATION

CONSTFlUCTlONIIMPLEMEHTATlON

FINAL STABlU2ATlON/TERMINATION

2.1.1 Collect Site Information

The first phase in preparing a pollution prevention plan is to collect information on the site which
will be developed. The following items are suggested.

Existing Conditions Site Map

Obtain a map of the existing conditions at the site. This map will be the starting point for the site
map required by the pollution prevention plan. The map should be to scale and preferably
topographic. The map should indicate the existing land use for the Sitl9 (ie.. wooded area, open
grassed area, pavement, building, etc.) as well as the location of surface waters which are located
on or next to the site (Surface waters include wetlands, streams, rivers, lakes, ponds, etc.). The
best way to obtain a site map is to have your site surveyed by a professional surveyor (either land
based or aerial). If it is not practical to survey the site, then topographic maps may be available
from your State or local government. A final alternative is to use the United States Geological
Survey (USGS) topographical maps. USGS maps are least desirable for lIse as a site map for a
pollution prevention plan because they are only available in a very large scale (1 :24,0001 and the
features of a construction site would be very difficult to distinguish. ThE' scale of the map should
be small enough so that you can easily distinguish important features SUGh as drainage swales and
control measures.

Soils Information

Determine the type of soils present on the site. This information should be based upon information
from your specific site. not regional characteristics. You may use the Selil Conservation Service's
(SCSI Soils Map of your area to determine types of soil on your site. The SCS Soil Surveys are
excellent sources of information for surface soils and typically will indicate if a soil is erodible.
Even more accurate information may be obtained by performing soil borings at the site; this method
is more expensive and is usually only required for some storm water prac:tices such as infiltration.
Soil borings may already be required for the design of foundations or other structures.

2-4

September 1992

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