Hawaii Stabilized Construction Entrance/Exit TR-1
The volcanic islands of Hawai'i have a climate with regular rainfall, which gives rise to hundreds of freshwater streams. Water resources provide essential habitat for a variety of plants, birds, and land animals. The coastal zones of Hawai'i support local industries and sports, including fishing, surfing, and inter-island trade. These prized water features are part of the islands' heritage and culture and are protected from pollution through local and federal efforts.
Hawaii Department of Health Clean Water Branch (CWB) NPDES Permits
In Hawaii, the Health Department's Clean Water Branch (CWB) administers Hawaii's State-administered NPDES program under the Clean Water Act permit. Hawaii's CWB protects and restores the state's inland and coastal waters for native marine wildlife. The department ensures water quality by conducting coastal water surveillance and watershed-based environmental management, including permit issuance, monitoring, enforcement, sponsorship of pollution runoff control projects, and public education. They can identify sources of water pollution through area surveillance, routine inspections, and complaint investigations. CWB oversees compliance with permit conditions through site inspections, source testing, special studies, and corrective measures, and administers these measures. They promote community-based watershed management through education and voluntary compliance with environmental management standards. Federal funding is provided for demonstration of best management practice (BMP) projects from the public and private sectors relating to non-point source control.
HAR Chapter 11-55 – NPDES General Permit Authorizing Discharges of Storm Water Associated with Construction Activity
Hawaii's Construction Stormwater General Permits are required for construction activities that disturb one or more acres of land. These permits provide specific requirements and criteria for controlling pollution sources during construction. To request coverage under the Construction Stormwater General Permit, the contractor must develop, implement, and maintain a Storm Water Pollution Prevention Plan (SWPPP). The SWPPP is a plan that defines the techniques to prevent pollution from leaving the site.
Stabilized Construction Entrance/Exit TR-1
A stabilized construction access is a point of entrance/exit to a construction site that is stabilized to reduce the tracking of mud and dirt onto public roads by construction vehicles. A stabilized construction entrance is a pad of aggregate underlain with filter cloth, located where traffic will enter or leave a construction site and connect to a public right-of-way, such as a street, alley, sidewalk, or parking area. The purpose of a stabilized construction entrance is to reduce or eliminate sediment tracking onto public rights-of-way or streets. Reducing sediment and other pollutant runoff onto paved roads helps prevent sediment deposition into local storm drains and the production of airborne dust. Entrances and exits require periodic top dressing with aggregate 3–6 inches in diameter. This BMP should be used in conjunction with street sweeping on the adjacent public right-of-way and should be constructed on relatively level ground, graded to direct runoff back onto the site where feasible. Stabilized construction entrances are relatively expensive to build, and when a wash rack is included, a sediment trap must also be provided to collect wash water runoff.
Stabilized Construction Roadway TR-2
Stabilized Construction Roadways are access roads, subdivision roads, parking areas, and other onsite vehicle transportation routes that should be stabilized immediately after grading, and frequently maintained to prevent erosion and control dust. Regions graded for construction, transport, and parking are especially susceptible to erosion and dust. The exposed soil surface is continually disturbed, leaving no opportunity for stabilization. However, these roadways must be removed, stabilized, or permanently surfaced as part of final site stabilization. Gravel construction roads are moderately expensive, but reduced construction delays often offset the cost. No additional dust control costs on construction roads should be required beyond those needed to meet local air quality requirements.
Entrance/Outlet Tire Wash TR-3
A tire wash located at stabilized construction access points is designed to remove sediment from tires and undercarriages. This helps prevent sediment from being transported onto public roadways. The tire wash requires a supply of wash water, a drainage ditch to collect runoff from the wash area and direct it to a sediment-trapping device, and a turnout or doublewide exit. Do not use where wet tire trucks leaving the site leave the road dangerously slick.
FODS Track out Control Mats
FODS Trackout Control System is a reusable entrance option that will save you the cost and stress of maintaining a gravel-stabilized construction entrance. FODS mats are easily set up and can be laid on concrete, asphalt, and soil while requiring no excavation. They can be easily relocated and maintained without the need for heavy machinery. A standard layout that commonly replaces these stabilized construction exits is a 1x5T, which provides a wide turning radius and a 35' length. The mat is made of a strong, high-density composite material and features teeth specially designed to grip tires and remove dirt and sediment. Debris is removed and collected at the bottom for easy cleanup. FODS' effective rockless design eliminates the need for periodic stone dressing, expensive wheel washes, and sediment traps. When sediment or rain fills the mat, it can be easily cleaned and restored to full functionality using the FODS shovel. These durable mats are designed to withstand roughly 10+ years of service. FODS can help you save money on construction entrances for years to come.
Additional Resources:
Department of Health: Clean Water Branch
Construction Storm Water General Permit FAQs
Stormwater Best Management Practice Manual
Honolulu DES Best Management Practice Manual Excerpt (TC-1, TC-2, TC-3)