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Metal Mining SWMP Guidance Document <br />Page 4 <br />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 of chemicals or equipment; <br />- outdoor milling or processing activities; <br />- historic mine drainage; <br />- tailings ponds; <br />- crushing facilities or significant dust and particulate generating activities; <br />- on-site waste disposal practices; and <br />- stockpiles of overburden, raw material, intermediate products, byproducts, finished <br />products or waste products. <br />Factors to consider include the toxicity of the material; quantify of chemicals used; amount <br />of material processed; the likelihood of contact with stormwater and history of significant <br />drainage, leaks or spills of toxic or hazardous pollutants. <br />This area will involve all industrial activities at the site which have the potential to contaminate stormwater. <br />This includes not only mining and milling activities, but also routine maintenance activities involving fertilizers, <br />pesticides, detergents, solvents, oils, etc. It is a good idea to discuss each activity sepazately. <br />Judge the potential for the taterial to be found in stormwater using, at a minimum, the following criteria: <br />the intensity of the activity (i.e., does it occur every day, or just once a yeaz, etc.) <br />the size of the area over which the activity takes place, the surface type (pavement, gravel, vegetation, etc.), <br />and other physical characteristics such as slope <br />ability of product storage and loading/unloading facilities (fuel tanks, drum storage, etc.} to contain spills and <br />leaks <br />the concentration and toxicity of materials which can be expected to be found in the facility's stormwater <br />runoff <br />the contamination of storage facilities with the substances being stored (e.g., used oil drums or tanks coated <br />with spilled oil) <br />the visibility of any potential problems (e.g., how close is the storage tank to the operations building) <br />Where potential stotmwater contamination sources are identified, appropriate preventive measures must be taken <br />and documented. These should be discussed under the BMPs description, below. The purpose of the SWMP is <br />to reduce or eliminate these sources; therefore, most of the remainder of the SWMP tazgets them. <br />Significant materials include but aze not limited to: raw materials; fuels; hazardous substances designated under <br />section 101(14) of CERCLA; any chemical the facility is required to report pursuant to section 3I3 of title III of <br />SARA; fertilizers; pesticides; and waste products such as tailings, leachate, ashes, slag and sludge that have the <br />potential to be released or mixed with stormwater dischazge. <br />"Significant" spills include, but aze not limited, to releases of oil or hazardous substances in excess of reportable <br />quantities under section 311 of the Clean Water Act (see 40 CFR 110.10 and CFR 117.21) or section 102 of <br />CERCLA (see 40 CFR 302.4). Other significant spills would include spills that could potentially add <br />substantial amounts of pollutants to the environment. For instance, chronically repeated smaller spills can <br />constitute significant spills if taken together. In addition, spills of materials besides hazazdous substances and <br />oil should be addressed if they pose a pollution potential to stotmwater. <br />