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ATTACHMENT C <br />2009-0009-DWQ as amended by 2010-0014-DWQ & 2012-2006-DWQ <br />4 <br />all non-visible pollutants which are known, or should be known, to <br />occur on the construction site. At a minimum, when developing BMPs, <br />Risk Level 1 dischargers shall do the following: <br /> <br />a. Consider the quantity, physical characteristics (e.g., liquid, powder, <br />solid), and locations of each potential pollutant source handled, <br />produced, stored, recycled, or disposed of at the site. <br /> <br />b. Consider the degree to which pollutants associated with those <br />materials may be exposed to and mobilized by contact with storm <br />water. <br /> <br />c. Consider the direct and indirect pathways that pollutants may be <br />exposed to storm water or authorized non-storm water discharges. <br />This shall include an assessment of past spills or leaks, non-storm <br />water discharges, and discharges from adjoining areas. <br /> <br />d. Ensure retention of sampling, visual observation, and inspection <br />records. <br /> <br />e. Ensure effectiveness of existing BMPs to reduce or prevent <br />pollutants in storm water discharges and authorized non-storm <br />water discharges. <br /> <br />6. Risk Level 1 dischargers shall implement good housekeeping <br />measures on the construction site to control the air deposition of site <br />materials and from site operations. Such particulates can include, but <br />are not limited to, sediment, nutrients, trash, metals, bacteria, oil and <br />grease and organics. <br /> <br />C. Non-Storm Water Management <br /> <br />1. Risk Level 1 dischargers shall implement measures to control all non- <br />storm water discharges during construction. <br /> <br />2. Risk Level 1 dischargers shall wash vehicles in such a manner as to <br />prevent non-storm water discharges to surface waters or MS4 <br />drainage systems. <br /> <br />3. Risk Level 1 dischargers shall clean streets in such a manner as to <br />prevent unauthorized non-storm water discharges from reaching <br />surface water or MS4 drainage systems. <br /> <br /> <br /> <br />