Clean Water Branch

Notice of Public Comment Period for

Kahului Airport

Stormwater Management Plan

NPDES File No. HI22KG725

Docket No. HI22KG725

January 25, 2023

 The Hawaii Department of Health (DOH), Clean Water Branch (CWB) is soliciting comments on the Kahului Airport Stormwater Management Plan (SWMP).

The Director of Health has selected the Two-Step General Permit approach to regulate Small Municipal Separate Storm Sewer Systems (Small MS4s) under the State’s National Pollutant Discharge Elimination System (NPDES) program. The first step of the Two-Step process was the adoption of Hawaii Administrative Rules (HAR) Title 11, Chapter 55, Appendix K. The public notice of the Kahului Airport SWMP is the second step. Both HAR 11-55, Appendix K and the Kahului Airport SWMP will be NPDES permit conditions for the Hawaii Department of Transportation, Airports Division (DOTA), Kahului Airport Small MS4 to regulate and impose water pollution control requirements on the discharge of stormwater and certain non-stormwater discharges to receiving State waters, to meet the MS4 permit standard, and to protect water quality.

Kahului Airport is located on the northeast side of Kahului and encompasses approximately 1,391 acres of land owned and operated by the DOTA. Kahului Airport is the primary airport on the island of Maui, accommodating both overseas and interisland flights. It ranks second to Daniel K. Inouye International Airport (HNL)  in passenger volume in the State of Hawaii. Kahului Airport’s MS4 includes all the Airport operational areas but does not include State land west of the airport (Kanaha Pond) or fallow State land east of the airport that are included in the Urbanized Area. Kahului Airport is categorized as a regulated “Non-Traditional Small MS4.”

Activities at Kahului Airport are primarily aircraft operations, including air carrier, air taxi, general aviation, and military use. Kahului Airport contains two paved runways with multiple taxiways linking them to the terminal area, a small general aviation parking apron, and helicopter/air tour facilities. The airport includes a passenger terminal and parking areas near the southwest ends of the taxiways. The ground equipment service facility is located on the east side of the terminal buildings. The DOTA Maintenance Baseyard is southwest of the terminal building. The Aircraft Rescue and Firefighting (ARFF) station is northeast of the terminal, and the ARFF fire training pit is located in a grassed area north of Runway 5-23. The Consolidated Rental Car Center is west of the terminal building.

The receiving water, Kalialinui Gulch, is classified as a Class 2, Inland Water.  Under HAR 11-54-4. the objective of Class 2 waters is to protect their use for recreational purposes, the support and propagation of aquatic life, agricultural and industrial water supplies, shipping, and navigation.  The uses to be protected in this class of waters are all uses compatible with the protection and propagation of fish, shellfish, and wildlife, and with recreation in and on these waters.

Persons wishing to comment upon or object to the proposed SWMP or to request a public hearing, should submit their comments or requests in writing no later than 30 calendar days after the date of this notice, either through E-mail at [email protected] or by mail at P.O. BOX 3378, Honolulu, HI 96801‑3378.

Copies of the Notice of Intent (NOI), SWMP, and other information are available for public inspection, Monday through Friday (excluding holidays) from 7:45 a.m. until 4:15 p.m., at the DOH Clean Water Branch office located at 2827 Waimano Home Road, Room 225, Pearl City, HI 96782.  Copies may be bought.  The NOI and SWMP are also available on the internet at: https://health.hawaii.gov/cwb/clean-water-branch-home-page/public-notices-and-updates/.  For more information or if you have special needs due to disability that will aid you in inspecting and/or commenting on the public notice permit and related information, please contact Mr. Darryl Lum, Supervisor of the Engineering Section, CWB, at the above address or (808) 586-4309 (Voice) at least seven (7) calendar days before the comment deadline.  For those who use a TTY/TDD, please call through Sprint Relay Hawaii, at 1‑711 or 1-877-447-5991.

All written comments and requests received on time will be considered.  If DOH determines that there is significant public interest, a public hearing may be held after at least 30 calendar days of public notice.

Please notify anyone you know who would be interested in this matter.