NCS000515_19Appendix G_20200921

Appendix
G

United States Office of Water EPA 832-F-99-021
Environmental Protection Washington, D.C. September 1999
Agency
0EPA storm Water
Management Fact sheet
Materials Inventory
DESCRIPTION
A materials inventory system involves the
identification of all sources and quantities of
"Significant" materials that may be exposed to direct
precipitation or storm water runoff at a particular
site. "Significant" materials are substances related
to industrial activities such as process chemicals,
raw materials, fuels, pesticides, and fertilizers.
When these substances are exposed to direct
precipitation or storm water runoff, they may be
carried to a receiving water body. Therefore,
identification of these materials helps to determine
sources of potential contamination and is the first
step in pollution control.
APPLICABILITY
A materials inventory system is appropriate at most
industrial facilities. Inventory of exposed materials
should be part of a baseline administrative program
and is directly related to both record keeping and
visual inspection Best Management Practices.
ADVANTAGES AND DISADVANTAGES
Since the program is intended to prevent pollution
before it occurs, it is not possible to quantify water
quality benefits to receiving waters of a materials
inventory program. However, it is anticipated that
an effective materials inventory program will
improve the quality of storm water discharges.
Limitations of a materials inventory system include:
• It is an on -going process that continually
needs updating.
• Qualified personnel are required to perform
the materials inventory from a storm water
perspective.
KEY PROGRAM COMPONENTS
Most facilities already have in place a materials
inventory system, but this system is not generally
followed from a storm water contamination
viewpoint. Adding storm water considerations into
an existing inventory should require only minimal
effort. When discussing a material inventory it is
very important to be aware of Material Safety Data
Sheets (MSDS). Currently the United States
Government has created a Hazard Communication
standard, which requires all firms manufacturing
and/or distributing chemicals within the United
States to prepare MSDSs for those chemicals and
distribute them to their customers.
Keeping an up-to-date inventory of all materials
(hazardous and non -hazardous) on the site will help
to track how materials are stored and handled on
site, and identify which materials and activities pose
the greatest risk to the environment. The following
instructions explain the basic steps in completing a
materials inventory:
Identify all chemical substances present in
the work place. Walk through the facility
and review the purchase orders for the
previous year. List all chemical substances
used in the work place and then obtain the
material safety data sheet (MSDS) for each.
• Label all containers to show the name and
type of substance, stock number, expiration
date, health hazards, suggestions for

handling, and first aid information. This
information is found on the MSDS.
Unlabeled chemicals and chemicals with
deteriorated labels are often disposed of
improperly or unnecessarily.
• Clearly mark on the inventory those
hazardous materials that require specific
handling, storage, use, and disposal
considerations.
An example Materials Inventory Worksheet is
provided in Figure 1. Based on your materials
inventory, describe the significant materials that
were exposed to storm water during the past three
years or are currently exposed.
Other BMPs should then be evaluated and
implemented to prevent exposure of these materials
to storm water or them before discharge. Figure 2
illustrates a sample worksheet for evaluating
exposed materials.
IMPLEMENTATION
The key to a proper materials inventory system is
continual updating of records. Maintaining an
up-to-date materials inventory is an efficient way to
identify what materials are handled on -site and
whether they contribute to storm water
contamination problems.
COSTS
Typically, the major cost of implementing a
materials inventory system is the time required to
adapt an existing program to emphasize storm water
quality. The incremental cost is usually small.
Costs of the program are often offset by cost
savings in other areas. Improved material tracking
and inventory practices, such as instituting a shelf
life program, can reduce the waste resulting from
the overstocking and disposal of outdated materials.
Careful tracking of all materials ordered may also
result in more efficient materials use.
Worksheet Completed by:
MATERIAL INVENTORY
Title:
Date:
Instructions: List all materials used, stored, or produced on site. Assess and evaluate these materials for their
potential to contribute pollutants to storm water runoff. Also complete Worksheet 3A if the
material has been exposed during the last three years.
Quantity (units)
Past Significant Spill or
Leak
Quantity
Likelihood
exposed
of contact
Material
Purpose /
Location
Used
Produced
Stored
during
last 3
years
with storm
water. If
yes,
Yes
No
describe
reason
Source: U. S. EPA, 1992.
FIGURE 1 SAMPLE MATERIAL INVENTORY

DESCRIPTION OF EXPOSED SIGNIFICANT MATERIAL
Worksheet Completed by:
Title:
Date:
Instructions: Based on your material inventory, describe the significant materials that were exposed to storm
water during the past three years or are currently exposed. For the definition of "significant
materials" see Appendix B of the manual.
Description of
Exposed
Significant
Material
Period of
Exposure
Quantity
Exposed (units)
Location (as
indicated on
the site map)
Method of
Storage or
Disposal (e.g.,
pile, drum, tank)
Description of
Material
Management
Practice (e.g.,
pile covered,
drum sealed)
Source: U. S. EPA, 1992.
FIGURE 2 EXPOSED MATERIAL WORKSHEET
REFERENCES
1. U.S. EPA, 1992. NPDES Best
Management Practices Guidance
Document.
2. U.S. EPA, 1992. Stormwater Management
for Industrial Activities: Developing
Pollution Prevention Plans and Best
Management Practices. EPA 832-R-92-
006.
ADDITIONAL INFORMATION
Center for Watershed Protection
Tom Schueler
8391 Main Street
Ellicott City, MD 21043
Northern Virginia Planning District Commission
David Bulova
7535 Little River Turnpike, Suite 100
Annandale, VA 22003
Oklahoma Department of Environmental Quality
Don Mooney
Water Quality Division, Storm Water Unit
P.O. Box 1677
Oklahoma City, OK 73101-1677
Southeastern Wis. Regional Planning Commission
Bob Biebel
916 N. East Avenue, P.O. Box 1607
Waukesha, WI 53187
United States Postal Service
Charles Vidich
6 Griffin Road North
Windsor, CT 06006-7030

The mention oftrade names or commercial products
does not constitute endorsement or recommendation
for the use by the U.S. Environmental Protection
Agency.
For more information contact:
Municipal Technology Branch
U.S. EPA
Mail Code 4204
401 M St., S.W.
Washington, D.C., 20460
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United States Office of Water 832-F-99-004
Environmental Protection Washington, D.C. September 1999
Agency
1 GoEP/� Storm Water
O&M Fact Sheet
Preventive Maintenance
DESCRIPTION
Preventive maintenance involves the regular
inspection, testing, and replacement or repair of
equipment and operational systems. As a storm
water best management practice (BMP), preventive
maintenance should be used to monitor systems
built to control storm water. These systems should
be inspected to uncover cracks, leaks, and other
conditions that could cause breakdowns or failures
of storm water mitigation structures and equipment,
which, in turn, could result in discharges of
chemicals to surface waters either by direct
overland flow or through storm drainage systems.
A preventive maintenance program can prevent
breakdowns and failures through adjustment, repair,
or replacement of equipment before a major
breakdown or failure occurs.
Typically, a preventive maintenance program
should include inspections of catch basins, storm
water detention areas, and water quality treatment
systems. Without adequate maintenance, sediment
and debris can quickly clog storm drainage facilities
and render them useless.
APPLICABILITY
Preventive maintenance procedures and activities
are applicable to almost all industrial facilities.
This concept should be a part of a general good
housekeeping program designed to maintain a clean
and orderly work environment. Often the most
effective first step towards preventing storm water
pollution from industrial sites is to improve the
facility's preventive maintenance and general good
housekeeping methods.
For many facilities, preventive maintenance to
protect water quality is simply an extension of
current plant preventive maintenance programs.
Most plants already have preventive maintenance
programs that provide some degree of
environmental protection. Such programs could be
expanded to include storm water considerations.
ADVANTAGES AND DISADVANTAGES
Preventive maintenance takes a proactive approach
to storm water management and seeks to prevent
problems before they occur. A preventive
maintenance program can improve water quality by
controlling pollutant discharges to surface water
that would result from spills and leaks. Preventive
maintenance programs can also save a facility
money by reducing the likelihood of having a
system breakdown and also by reducing the
likelihood of funding costly cleanup projects. In
addition, a preventive maintenance program can be
an effective community relations tool.
The primary limitations of implementing a
preventive maintenance program include:
Cost.
Availability of trained preventive
maintenance staff technicians.
Management direction and staff motivation
in expanding the preventive maintenance
program to include storm water
considerations.

KEY PROGRAM COMPONENTS
Elements of a good preventive maintenance
program should include the following:
• Identification of equipment or systems that
may malfunction and cause spills or leaks,
or may otherwise contaminate storm water
runoff. Typical equipment to be inspected
inspected includes pipes, pumps, storage
tanks and bins, pressure vessels, pressure
release valves, process and material
handling equipment, and storm water
management devices.
• Establishment of schedules and procedures
for routine inspections.
• Periodic testing of plant equipment for
structural soundness.
• Prompt repair or replacement of defective
equipment found during inspection and
testing.
• Maintenance of a supply of spare parts for
equipment that needs frequent repairs.
• Use of an organized record -keeping system
to schedule tests and document inspections.
• Commitment to ensure that records are
complete and detailed, and that they record
test results and follow-up actions.
Preventive maintenance inspection records
should be kept with other visual inspection
records.
IMPLEMENTATION
The key to properly implementing and tracking a
preventive maintenance program is through the
continual updating ofmaintenance records. Update
records immediately after performing preventive
maintenance or repairing an item and review them
annually to evaluate the overall effectiveness of the
program. Then refine the preventive maintenance
procedures as necessary.
No quantitative data on the effectiveness of
preventive maintenance as a BMP is available.
However, it is intuitively clear that an effective
preventive maintenance program will result in
improved storm water discharge quality.
COSTS
The major cost of implementing a preventive
maintenance program on storm water quality is the
staff time required to administer the program.
Typically, this is a small incremental increase if a
preventive maintenance program already exists at
the facility.
REFERENCES
1. U.S. EPA, June, 1981. NPDES Best
ManagementPractice GruidanceDocument.
2. U.S. EPA, Pre-print, July 1992. Storm
Water Management for Industrial
Activities: DevelopingPollution Prevention
Plans and Best Management Practices.
EPA 832-R-92-006.
3. Washington State Department of Ecology,
February 1992. Storm Water Management
Manual for Puget Sound.
ADDITIONAL INFORMATION
Center for Watershed Protection
Tom Schueler
8391 Main Street
Ellicott City, MD 21043
Northern Virginia Planning District Commission
David Bulova
7535 Little River Turnpike, Suite 100
Annandale, VA 22003
Oklahoma Department of Environmental Quality
Don Mooney
Water Quality Division, Storm Water Unit
P.O. BOX 1677
Oklahoma City, OK 73101-1677

Southeastern Wisconsin Regional Planning
Commission
Bob Biebel
916 N. East Avenue, P.O. Box 1607
Waukesha, WI 53187
United States Postal Service
Charles Vidich
6 Griffin Road North
Windsor, CT 06006-7030
The mention of trade names or commercial
products does not constitute endorsement or
recommendation for the use by the U.S.
Environmental Protection Agency.
For more information contact:
Municipal Technology Branch
U.S. EPA
Mail Code 4204
401 M St., S.W.
Washington, D.C., 20460
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