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HDOT Highways has embarked on a proactive comprehensive Storm Water Management Program (SWMP). This initiative is being taken to comply with our National Pollutant Discharge Elimination Systems (NPDES) Permit for the Oahu municipal separate storm sewer system (Oahu MS4), and the mandates of a Consent Decree due to non-compliance with previous NPDES permit requirements. The Oahu MS4 qualifies as a “large municipal separate storm sewer system” since it services a population greater than 100,000. The Oahu MS4 is therefore, subject to permitting requirements under the National Pollutant Discharge Elimination System (NPDES) Program for storm water discharges. The program is designed to reduce, to the maximum extent practicable, the amount of storm water containing pollutants from entering and ultimately discharging from the HDOT Highways MS4 into the streams, rivers and ocean that we all enjoy.
Storm water is generally discharged untreated into state waters such as streams, coastal waters and drainage ditches. Storm water runoff often contains pollutants, such as oil, debris and sediments, which adversely affects the quality of state waters.
The State of Hawaii Department of Transportation Highways Division (HDOT Highways) has developed a plan for its Oahu Storm Water Management Program (SWMP). The Oahu SWMP plan outlines the HDOT Highways program to address storm water pollution associated with operating the HDOT Highways-related network and facilities on Oahu.
All files are available in Adobe PDF format and will require Adobe Acrobat Reader to view.
Download the entire plan (without appendices- 7.6 MB) or, download by chapter below.
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