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APPENDIX B (cont.) <br />At a minimum, each of the following shall be evaluated for the reasonable potential for <br />contributing pollutants to runoff: <br />-Loading and unloading operations <br />-Outdoor storage activities <br />-Outdoor manufacturing or processing activities <br />-Significant dust or particulate generating processes <br />-On-site waste disposal practices <br />-The presence of salt piles <br />-SARA Title III Section 313 Water Priority Chemicals <br />-Areas where significant spills and significant leaks of toxic or hazazdous substances have <br />occurred at the facility from three years prior to permit certification to the time of SWMP <br />preparation. <br />Factors to consider include the toxicity of chemicals; quantity of chemicals used, produced, or <br />discharged; the likelihood of contact with stonnwater; and history of significant leaks or spills <br />of toxic or hazardous substances. <br />The description of BMPs shall include: <br />1) Stormwater diversion: Describe how and where stormwater will be diverted away from <br />industrial areas to prevent stormwater contamination. <br />2) Materials handling and snill nrevention: Where materials can impact stotmwater runoff, <br />existing practices that reduce the potential for contamination shall be described. For <br />example, materials shall be stored and handled in covered areas to prevent contact with <br />stormwater, and chemicals shall be stored within berms or secondary containment devices to <br />prevent leaks and spills from entering stormwater runoff. <br />3) Sediment and erosion prevention: The plan shall identify areas which, due to topography, <br />activities, or other factors, have a high potential for significant soil erosion, and identify <br />measures taken to limit erosion. <br />4) Other pollution prevention measures: The plan shall identify any other structural and non- <br />structural measures for stormwater quality control on-site. <br />In each case where stormwater pollution potential exists, appropriate preventive measures must <br />be taken and documented. <br />c. Sampling Information -The plan shall include a summary of any existing discharge sampling <br />data describing pollutants in stormwater discharges, and a description of each proposed <br />sampling point, should monitoring be required. <br />d. Preventive Maintenance - A preventive maintenance program is required, and shall involve <br />inspection and maintenance of stormwater management devices (cleaning oil/water separators, <br />catch basins, etc.) as well as inspecting and testing plant equipment and systems to uncover <br />conditions that could cause breakdowns or failures resulting in dischazges of pollutants to <br />surface waters. <br />7/96/lhm B-2 <br />