NOTICE OF PROPOSED WATER POLLUTION CONTROL PERMIT
FOR THE KAILUA REGIONAL WASTEWATER TREATMENT PLANT
KAILUA, ISLAND OF OAHU
NPDES PERMIT NO. HI 0021296
DOCKET NO. HI 0021296
January 20, 2020
The State Department of Health (DOH) tentatively proposes to issue a renewal National Pollutant Discharge Elimination System (NPDES) permit to discharge secondary-treated wastewater from the Kailua Regional Wastewater Treatment Plant, to receiving State waters, subject to special conditions to:
CITY AND COUNTY OF HONOLULU
DEPARTMENT OF ENVIRONMENTAL SERVICES
(Permittee)
The proposed NPDES permit for the existing discharge will expire five (5) years from the date of issuance.
The Permittee owns and operates the facility, located in Kailua, Hawaii, on the Island of Oahu. The facility has a design capacity of 15.25 MGD and provides secondary treatment of wastewater for approximately 94,000 in the communities of Ahuimanu, Kaneohe, and Kailua. Treatment consists of three mechanical fine bar screens, two grit removal systems, four primary clarifiers, two biotowers, two aerated solids contact tanks, and three secondary clarifiers. Treated effluent from the facility flows through a Parshall flume and then comingles with treated effluent from the Kaneohe Marine Corps Base. Mixed effluent is conveyed by forcemain to the Pacific Ocean off of the Mokapu Peninsula through Outfall Serial No. 001 at Latitude 21°27’32” N and Longitude 157°42’56” W. Outfall Serial No. 001 is a 48 inch diameter, deep ocean outfall that discharges treated effluent approximately 105 feet below the surface of the water through a diffuser that is approximately 960 feet long and begins 3,500 feet offshore.
Sludge processing consists of two dissolved air flotation thickeners, four anaerobic digestors, and three centrifuges. Processed sludge is hauled to H Power for waste to energy conversion and is only disposed of in a landfill when H Power is not available.
Persons wishing to comment upon or object to the proposed NPDES permit 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: cleanwaterbranch@doh.hawaii.gov or by mail at 2827 Waimano Home Road, Room 225, Pearl City, Hawaii 96782.
Copies of the proposed public notice permit 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 (CWB) office located at the 2827 Waimano Home Road 225, Pearl City, Hawaii 96782. Copies may be bought. The public notice permit and fact sheet are also available on the internet at: http://health.hawaii.gov/cwb/site-map/home/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.
If DOH’s position is substantially unchanged after considering all timely written comments and all oral comments at any public hearing that may be held, then the DOH will issue the NPDES permit and this action will be final.
Please notify anyone you know who would be interested in this matter.
BRUCE S. ANDERSON, Ph.D.
Director of Health
01004PKP.20a
(SA1258416 1/20/20)
