Clean Water Branch

NOTICE OF CLEAN WATER BRANCH RECOMMENDATIONS FOR
WATER POLLUTION CONTROL PERMIT FOR
HAWAIIAN CEMENT
HALAWA QUARRY LOWER AREA
NPDES PERMIT NO. HI 0021951

DOCKET NO. HI 0021951

PUBLIC COMMENT PERIOD
December 10, 2025 – January 9, 2026

The Hawaii Department of Health (DOH), Clean Water Branch (CWB) tentatively recommends to the Director of Health (Director) to issue a National Pollutant Discharge Elimination System (NPDES) Permit to regulate and impose water pollution control requirements on the discharge commingled process wastewater and storm water overflows from holding ponds from the Halawa Quarry Lower Area (Facility), to receiving State waters, subject to special conditions, to:

HAWAIIAN CEMENT

A permit for such discharge would expire five (5) years from the effective date of the permit. The facility is located at: 99-1300 Halawa Valley Street, Aiea, Hawaii 96701.

Hawaiian Cement (Permittee) operates the Facility, located in Halawa Industrial Park in Aiea, Hawaii on the Island of Oahu.  The Facility consists of a wet and dry batch plants, a conveyor building with a gravel mound, three (3) truck washing areas, and various maintenance, storage, and administrative buildings.  Site operations include rock crushing equipment, an aggregate wash plant, a wash water clarifier, aggregate stockpile areas, an aggregate screening mill, two (2) ready-mix concrete batch plants, the Halawa Asphalt plant, maintenance shop/warehouse, scale house, concrete reclaim system, truck tire wash, and miscellaneous smaller support buildings. The lower quarry area contains multiple process wastewater and storm water conveyances, holding (settling) ponds, and high-volume sumps.  Hawaiian Cement requests to discharge comingled process wastewater and storm water overflows from holding ponds during heavy rain events that result in greater than nine (9) inches of rainfall, overflow from the to North Halawa Stream at Outfall Serial No. 001 at coordinates: Latitude 21°22’31.5ʺN and Longitude 157°54’32.5ʺW.

The receiving water, North Halawa Stream, is classified by the DOH as Class 2 Inland Waters under Hawaii Administrative Rules (HAR), Sections 11-54-5.  It is the objective of Class 2 waters 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.  Class 2 waters shall not act as receiving waters for any discharge which has not received the best degree of treatment or control compatible with the criteria established for these classes.

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 [email protected] or by mail at P.O. BOX 3378, Honolulu, Hawaii 96801‑3378.

Copies of the Public Notice Permit recommended by CWB 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, Hawaii 96782. Copies may be bought. Electronic copies of the proposed Public Notice Permit and other information are also available online 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 a disability and require aid in inspecting and/or commenting on the Public Notice Permit and related information, please contact Mr. Reef Migita, Supervisor of the Engineering Section, Clean Water Branch, at the above address or (808) 586-4309 (Voice) as soon as possible before the end of the comment period. For those who use a TTY/TDD, please call through Sprint Relay Hawaii, at 1 711 or 1-877-447-5991. If a request for assistance is made after the end of the comment period, the CWB will try to fulfill the request. However, fulfillment prior to a final determination cannot be guaranteed. Requests submitted as early as possible are more likely to be fulfilled.

All written comments and requests received on time will be considered. If the Director determines that there is significant public interest, a Public Hearing may be held after at least 30 calendar days of Public Notice.

If CWB believes, after considering all timely written comments at any Public Hearing that may be held, that no substantive changes to the conditions of the Public Notice Permit are necessary or warranted, then CWB may recommend to the Director that the NPDES Permit be issued.

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

DARRYL LUM, P.E.

Clean Water Branch Chief