Laserfiche WebLink
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; quantity 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 separately. <br /> Judge the potential for the material 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 year, 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 stormwater 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 targets them. <br /> Significant materials include but are 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 313 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 discharge. <br /> "Significant" spills include, but are 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 hazardous substances and <br /> oil should be addressed if they pose a pollution potential to stormwater. <br />