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It is a good idea to start with a portion of the USGS (U.S. Geological Survey) quadrangle map showing the site. These are
<br />available and easily obtainable for the entire state; they show a large amount of information for very little effort. You can
<br />then use the USGS map as a guide for preparing your site map, which will be more detailed. Regardless of the source of
<br />the base map, the site map needs to be of suitable scale to show the industrial portion of the facility and the features within
<br />it.
<br />? Locations of stormwater outfalls:
<br />If the site has a stormwater drainage system, the location of outfalls is a simple task. Indicate on the map where
<br />pipeline outfalls are, as well as the general layout of the drainage system such as inlets, grates, pipelines, etc. If
<br />stormwater is conveyed over land without a developed storm drainage system, the points where runoff collects and
<br />runs off must be located.
<br />? Drainage basins for each outfall:
<br />Field inspection can usually accomplish this task with acceptable accuracy. Look for high areas such as crests of
<br />parking lots, roads, etc. which would form the division between drainages. Gullies and swales are indicators of
<br />stormwater flow direction. Obviously, if runoff is observed during a storm, most uncertainties can be eliminated.
<br />? Surface water bodies (including dry water courses):
<br />Mark on the site map any surface water bodies, including lakes, streams, springs, wetlands, detention ponds, roadside
<br />or irrigation ditches, etc. These do not necessarily need to be within the facility, but may be adjacent to it or impacted
<br />by stormwater runoff. Also include any existing storm sewers.
<br />? Existing structural control measures to reduce stormwater pollution:
<br />Show on the map the location of any structural stormwater pollution control measures, such as detention ponds,
<br />diversion ditches, covered material storage areas, fuel farm secondary containment structures, etc.
<br />In addition, there are several other features which could be included to make the SWMP a more comprehensive and usable
<br />plan. For example, later sections of the SWMP will include requirements for spill prevention procedures, which can include
<br />a site map showing where materials are stored. By including the following items on the site map, all information would be in
<br />one place on a single base map.
<br />? Materials handling and loading areas
<br />? Materials storage areas
<br />? Paved and unpaved areas (for hydrologic assessments)
<br />2. Description of Potential Pollutant Sources/Material Inventory
<br />The plan shall provide a description of all potential sources (activities and materials) which may reasonably be
<br />expected to add pollutants to stormwater discharges. Such sources may include haul roads, equipment
<br />storage and maintenance areas, fuel storage areas, etc.
<br />In each case where stormwater pollution potential exists, appropriate preventive measures must be taken and
<br />documented.
<br />This section of the SWMP summarizes the existing potential for stormwater contamination at the site. It is a narrative
<br />description which states what is stored, where it is stored, how it is used, what has been used, etc. These can include such
<br />pollutants as fuels, oils, detergents, pesticides, herbicides, fertilizers, etc.
<br />3. Stormwater Quality Controls
<br />Each mining site covered by this plan shall develop a description of stormwater quality controls appropriate
<br />for that site, and implement such controls. The appropriateness and priorities of controls in the plan shall
<br />reflect identified potential sources of pollutants at the site. The description of stormwater quality controls
<br />shall address the following minimum components, including a schedule for implementing such controls:
<br />This section of the SWMP, when completed, will spell out what the facility is doing to control stormwater pollution, what the
<br />facility will do in the future, when Best Management Practices (BMPs) will be implemented, and who at the facility is
<br />responsible for the plan.
<br />a) SWMP Administrator -The SWMP shall identify a specific individual or individuals within the mining
<br />organization who is responsible for developing the SWMP and assisting the mine operator in its
<br />implementation, maintenance, and revision.
<br />B2
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