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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 available and easily
<br />obtainable for the entire state; they show a large amount of information for very little effort. You can then use the USGS map as a guide for preparing
<br />your site map, which will be more detailed. Regardless of the source of the base map, the site map needs to be of suitable scale to show the industrial
<br />portion of the facility and the features within it.
<br />• Locations of stormwater outfalls:
<br />If the site has a stonnwate:r drainage system, the location of outfalls is a sunple task. Indicate on the map where pipeline outfalls are, as well as
<br />the general layout of the drainage system such as inlets, grates, pipelines, etc. If stormwater is conveyed over land without a developed storm
<br />drainage system, the points where runofFcollects and runs offmust be located.
<br />• Drainage basins for each eutiall:
<br />Field inspection can usual ly accomplish this task with acceptable accuracy. Look for high areas such as crests of parking lots, roads, eta which
<br />would form the division between drainages. Gullies and swales are indicators of stormwater flow direction. Obviously, if runoff' is observed
<br />during a storm, most unce~tain6es can be eliminated.
<br />• Surface water bodies (includiing dry water courses):
<br />Mark on the site map any surface water bodies, including lakes, streams, springs, wetlands, detention ponds, roadside or irrigation ditches, etc.
<br />'T'hese do not necessarily need to be within the facility, but may be adjacent to it or impacted by sloimwater runoff. Also include any existing
<br />stoma sewers.
<br />• l:xis6ng 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, diversion ditches, covered
<br />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 plan. For example, later
<br />sections of the SWMP will include requirements for spill prevention procedures, which can include a site map showing where materials are stored. By
<br />including the following items on the site map, all information would be in 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/Materiallnventory
<br />The plan shall provide a description of all potential sources (activities and materials) which may reasonably be expected to add
<br />pollutants to stor-nrvate,r discharges. Srrch sources may include haul roads, equipment storage and maintenance areas, fuel
<br />storage areas, etc.
<br />In each case where stormwater poldrrtion potential exists, appropriate preventivemcasures must be taken and documented.
<br />This section of the SWMP summarizes the existing potential for stormwater contamination at the site. It is a narrative description which states what is
<br />stored, where it is stored, how it is used, what has been used, etc. These can include such pollutants as fuels, oils, detergents, pesticides, herbicides,
<br />fertilizers, etc.
<br />3. stormwater Quality Controls
<br />Each mining site covered by this plan shall develop a description of stormwater quality controls appropriate for that site, and
<br />implement such controls. Tlae appropriateness and priorities of controls in the plan shall reflect identified potential sources of
<br />pollutants at the site. The description of stormwater duality controls shall address the following mininrur» components,
<br />including a schedule for implementing suet: controls:
<br />This section of the SWMP, when completed, will spell out what the faciliryis doing to control stormwater pollution, what the facility will do in the
<br />future, when Best Management :Practices (BMPs) will be implemented, and who at the facility is responsible for the plan.
<br />a) SWMPAdministrator- Tke SWMPsl:all identify a specific individual or individuals within the mining organization who is
<br />responsible for developitrg the SWMP and assisting the mine operator in its implementation, maintenance, and revision.
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