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State" may exist on a construction site as well as off site; for example, a creek running <br /> through a site.) <br /> 2. Stormwater Associated with Construction Support Activity. This permit also authorizes <br /> stormwater discharge from support activities related to the permitted construction site <br /> (for example, an on-site portable rock crusher, off-site equipment staging yards, material <br /> storage areas, borrow areas, etc.) provided: <br /> a. The support activity relates directly to the permitted construction site that is <br /> required to have an NPDES permit; and <br /> b. The support activity is not a commercial operation serving multiple unrelated <br /> construction projects,and does not operate beyond the completion of the <br /> construction activity; and <br /> c. Appropriate controls and measures are identified in the Stormwater Pollution <br /> Prevention Plan (SWPPP) for the discharges from the support activity areas. <br /> 3. Nan-Stormwater Discharges. The categories and sources of non-stormwater discharges <br /> identified below are authorized conditionally, provided the discharge is consistent with <br /> the terms and conditions of this permit: <br /> a. Discharges from fire-fighting activities. <br /> b. Fire hydrant system flushing. <br /> c. Potable water, including uncontaminated water line flushing. <br /> d. Hydrostatic test water. <br /> e. Uncontaminated air conditioning or compressor condensate. <br /> f. Uncontaminated groundwater or spring water. <br /> g. Uncontaminated excavation dewatering water(in accordance with S9.D.10). <br /> h. Uncontaminated discharges from foundation or footing drains. <br /> i. Uncontaminated or potable water used to control dust. Permittees must minimize <br /> the amount of dust control water used. <br /> j. Routine external building wash down that does not use detergents. <br /> k. Landscape irrigation water. <br /> The SWPPP must adequately address all authorized non-stormwater discharges,except for <br /> discharges from fire-fighting activities, and must comply with Special Condition 53. At a <br /> minimum,discharges from potable water(including water line flushing), fire hydrant system <br /> flushing,and pipeline hydrostatic test water must undergo the following: dechlorination to a <br /> concentration of 0.1 parts per million(ppm) or less, and pH adjustment to within 6.5—8.5 <br /> standard units(su), if necessary. <br /> D. Prohibited Discharges <br /> The following discharges to waters of the State, including groundwater, are prohibited: <br /> Construction Stormwater General Permit Page 4 <br />