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' Sutrmwater Management Plar~ ~ Pa;~c Z <br />"fhe drainage areas shown should include [he portions of the site where industrial activities recur, as well as <br />those portions cuntrihuting swrmwater that mixes with runoff from the industrial llfCa. Th CI'C tU rC. [hC Cn11rC <br />drainage area where industrial .activities occur must usually he included. <br />Aside t~um mining, industrial activities can include eyuipmen[ washing, materi:ds sairage, vehicle maintenance <br />ur fueling, incineration, waste treatment, storage or disposal, shipping/loadinglunluading, etc. 1'uu Ju nut need . <br />to include industrial activities which only take place indoors, unless there is some part ur aspect of the activny <br />with which suxmwater could come in contact. Ptir example, if all vehicle maintenance is dune indoors, hui <br />vehicle storage or fueling is outside, the vehicle storage ur fueling area nursl he addressed <br />It is a good idea to sari with a portion of the USGS (U.S. Geological Survey) quad Tangle map showing [hc aitc. <br />These are available and easily uhtainahle titr the entire st,ue, they show a large antoum ut inti~rmation tiu very <br />little etfon. Yuu can then use dte USGS map as a guide for preparing your site map, which will he more <br />tletaildd. <br />Local nwnicipalities may also have maps suitable as bases iu begin mapping procedures If no uihei sunnhlc <br />base maps are available. one must hd developul. Regardless Ut the SUmCC U[ the h;ise map, the .itc map ncc~la <br />ni he of >uitahle scale w show the industrial puninn of the facility and IhC tCallll'C? within u <br />-> I_ocauont of stormwater ou[falls' <br />If the site hat a snnmwater tlrunuge system, the locauun of uutfalls is a simple task. Indicate un the nt,gt <br />where pipeline uurt:dls are. as well as the general layuw of the Jramage system such as mleis. gi :u e~. <br />pipelines, etc. If stnrmw;uer is ainveydd over land witltuul a developed slurm druna~•e <v~lrm. the p~~inl~ <br />where runoff collects and runs off must he Ioeuetl. <br />-> Drainage basins fiir each outfall: <br />Field inspection can usually accomplish this task with acceptable accuracy. Luuk titr high areas such as <br />crests of parking lots, roads, etc. which would form the division between drainages. GIIIIIC~ and sw;des <br />are indicators ut'satrmwa[er flow direction. Obviously, if runoff is uhserverl during a storm. must <br />uncertainties can he eliminated. <br />-~ Surface water hudies (including dry water courses): <br />Matti un the silo map any surf`.tce water hudies. including lakes. stre:uns, springs, wetlands. detention <br />ponds. ruadsitlc ur irngatiun ditches. etc. These do nrn necessarily read u• he within the Ln ilirv. hui mee <br />he adjacent to it ur impacted 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 <br />ponds, diversion ditches, covered material storage areas, fuel farm secondary containment structures, etc. <br />In addition, there are several other features which could 6e included to make the SWMP a more cuntprehensive <br />and usable plan. For example, later sections of the SWMP will include requirements fix spill prevention <br />procedures, which can include a site map showing where materials are stored. By including the following items <br />on the site map, all information would be in one place on a single base map. <br />materials handling and loading areas <br />-~ Aaterials storage areas <br />-- Areas where industrial activities take place <br />-~ Paved and unpaved areas (far hydrologic assessments) <br />