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S4JVIP Guidance
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<br />disposal, printing, shipping loading/t~ading, etc. You do not need to includ~ustrial activities which only
<br />take place indoors, unless there is some part or aspect of the activity with which stormwater could come in
<br />contact. For e:tample, if all vehicle maintenance is done indoors, but vehicle storage or fueling is outside, the
<br />' '~Ie storage or fueling azea must be addressed.
<br />It may be helpful to include some measure of the facility size, such as storage capacity, production capacity,
<br />number of units processed, etc. For those under the Heavy Industry permit, in cases where the requirement to
<br />sample is based on some measure of facility capacity or production specialty (such as airports, fertilizer
<br />manufacturers, battery reclaimers, refineries, chemical and rubber/plastic product manufacturers), be sure to
<br />address this issue.
<br />2. ire : a . The plan shall Include a site map indicating an outline of the drainage area of each
<br />stormwater outfalI (to the extent possible), each existing .structural control measure to reduce
<br />pollutants in stormwater runoff, and surface water bodies.
<br />Each facility must develop a site map. In general, the aeeas described in Itetn 1, above, aze the aeeas which
<br />genera[e stormwater affected by industrial activities. The drainage aeeas shown should include the portions of the
<br />site where the activities occur, as well as those portions contributing stotmwater that mixes with runoff from the
<br />industrial area. Therefore, the entire drainage azea where industrial activities occur must usually be included.
<br />It is a good idea to start with a portion of the USGS (U.S. Geological Survey) quadrangle map showing the site.
<br />(See example, Appendix A.) These are available and easily obtainable for the entire state (call USGS, (303)202-
<br />4700); they provide a large amount of information for very little eiiort. You can then use the USGS map as a
<br />m•~~ie for preparing your site trap, which will be more detailed. (See example, Appendix B.)
<br />Local municipalities may also have maps suitable as bases to begin mapping procedures. Regazdless of the source
<br />of the base map, the site map needs to be of a suitable scale to show the industrial portion of the facility and the
<br />features withirt it.
<br />The tnap should show, at a minimum:
<br />- focadons of stormwater outfalls
<br />If the site has a stormwater drainage system, the location of outfalls is a simple task. Indicate on the trap
<br />where pipeline outfalls aze, as well as the general layout of the drainage system such as inleu, grates, pipelines,
<br />etc. If stottnwater is conveyed over Iand without a developed storm drainage system, the points where runoff
<br />collects and pint off must be located.
<br />- drainage basins for each outiall
<br />Field inspection can usually accomplish this task with acceptable accuracy. Look for high areas such as crests
<br />of pazking lots, roads, etc. which would form the division between drainages. Gullies and swales aze indicators
<br />of stormwater flow direction. Obviously, if runoff is observed during a storm, most uncertainties can be
<br />eliminated.
<br />- surface water bodies (including dry water courses)
<br />btazk on the site map any surface water bodies, including lakes, streams, springs, wetlands, detention ponds,
<br />roadside or irrisation ditches, etc. These do not necessarily need to be within the industrial portion of the
<br />facility, but may be adjacent to it or impacted by stottnwater runoff. Also include any existing storm sewers.
<br />- existing structural control measures to reduce stormwater pollution
<br />tow on the map the location of any structural stormwater pollution control measures, such as detention ponds,
<br />diversion ditches, covered material storage aeeas, fuel farm secondary containment structures, etc.
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