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Waimanalo Gulch Landfill -
Oahu
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EXPANSION PLANS FULFILL ONGOING CAPACITY NEEDS
Extending the use of the local landfill will save money for residents and local businesses and provide economic benefits for the Waianae Community.
Compete Details
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- Opened in 1989
- Approximately 200 acres
- 78.9 acres in use since 1989
- 64.5 acres used for landfilling
- 29 acres used for administration
- Owned by the City and County of Honolulu and operated by Waste Management of Hawaii
- Fulfills ongoing capacity needs
- Takes in 400,000 tons of waste per year including 100,000 tons of ash from waste-to-energy H-POWER generators
- Constantly monitored and tested by regulatory agencies
- Managed by a team of professional engineers and environmentalists
- Environmental safeguards and technologies are employed
- Berm used for aesthetics and operational best practice
- $150,000-$250,000 planned for additional landscaping and vegetative buffers
- $2.5-million Community Benefits Package focused on the Leeward communities was implemented by the City and County of Honolulu
The Waimanalo Gulch Landfill is owned by the City and County of Honolulu and operated under a contract with Waste Management of Hawaii. The site is approximately 200 acres - of which 78.9 have been in use since the landfill opened in 1989. Of this site, 64.5 acres are used for landfilling and 29 for administration. In 2002, a 14.9-acre expansion was approved for additional landfill capacity.
Each year on Oahu, roughly 1.6 million tons of waste are generated each year. Approximately 500,000 tons of reusable waste - including green waste, tires and concrete, are recycled through a variety of programs. H-POWER, which is the City and County's waste-to-energy facility, processes 600,000 tons of waste. Another 200,000 tons are deposited into a private construction and demolition landfill. This leaves roughly 400,000 tons of waste a year that is brought to the City's Waimanalo Gulch Landfill, including 100,000 tons of ash per year generated by H-POWER incineration.
In June, 2005 a gas collection and control system was installed. The well-field captures methane gas from the landfill, sends it to the flare which burns it at 1,600 degrees. This $1.5 million system also helps to mitigate odors.
At the end of 2005, construction of a new $2-million berm fronting the landfill was completed. Berms are used as a windbreak, to improve aesthetics, and to reinforce the stability of a landfill. The new berm provides an additional safety factor to guard against catastrophic events (hurricanes, earthquakes) shifting material in the landfill.
Hours of Operation: 7 a.m. to 4:30 p.m. daily except for Christmas and New Year’s Day.
Waimanalo Gulch Landfill -
(808) 668-2985
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