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reoxygenated if necessary, and volumetrically and velocity <br />controlled to prevent resuspension of sediments in the MS4. <br />Discharges shall be thermally controlled to prevent an increase <br />in temperature of the receiving water. Swimming pool cleaning <br />wastewater and filter backwash shall not be discharged to the <br />MS4. <br />Street and sidewalk wash water, water used to control dust, and <br />routine external building wash -down that does not use <br />detergents. The Secondary Permittee shall reduce these <br />discharges through, at a minimum, public education activities <br />and/or water conservation efforts conducted by the Secondary <br />Permittee and/or the local jurisdiction. To avoid washing <br />pollutants into the MS4, the Secondary Permittee shall <br />minimize the amount of street wash and dust control water <br />used. <br />• Other non-stormwater discharges shall be in compliance with <br />the requirements of a pollution prevention plan reviewed by the <br />Permittee which addresses control of such discharges. <br />iii. The Secondary Permittee shall address any category of discharges in <br />(ii) or (iii) above if the discharge is identified as a significant source <br />of pollutants to waters of the State. <br />Maintain a storm sewer system map showing the locations of all known <br />storm drain outfalls, labeling the receiving waters, other than ground <br />water, and delineating the areas contributing runoff to each outfall. Make <br />the map (or completed portions of the map) available on request to <br />Ecology and to the extent appropriate, to other Permittees. The preferred <br />format for mapping is an electronic format with fully described mapping <br />standards. An example description is provided on Ecology's websitc.1 <br />d. Conduct field inspections and visually inspect for illicit discharges at all <br />known MS4 outfalls. Visually inspect at least one third (on average) of all <br />known outfalls each year beginning no later than two years from the initial <br />date of permit coverage. Implement procedures to identify and remove any <br />illicit discharges. Keep records of inspections and follow-up activities! <br />'New Secondary Permittees shall meet the requirements of S6.D.4.c no later than four and one-half years from the <br />initial date of permit coverage. <br />B New Secondary Permittees shall develop and implement procedures described in S6.D.3.d no later than two years <br />from the initial date of permit coverage. <br />Eastern Washington Phase II Municipal Stormwater Permit August 1, 2014 <br />Page 34 <br />