2008-07-22 Resolution_702-08_re_Violations_of_federal_clean_air_act_gas_emissions_and_controls_for_West_Hawaii_Landfill

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excavation of burning waste material and suppression on an adjacent suppression deck using a fire-retardant foam product;and 2) trials of an innovative in-situ suppression approach using foam infiltration and waste blending (to the extent necessary to improve foam/waste contact) in an attempt to extinguish burning waste without removal of waste material. The demonstration area will be selected based on evidence of active shallow waste combustion activity. A suppression deck will be created using crushed stone materials adjacent to the area to be excavated. A dozer or excavator will be employed to remove the two (2)feet of cover materials overlying the existing polyvinyl chloride (PVC) geomembrane, exposing the underlying waste material. Waste material,anticipated to be in part burning,will be excavated in approximate 1-foot lifts and transferred to the adjacent suppression deck for Class A foam suppression. The material on the suppression deck will be worked with a dozer or excavator and foam added to complete the extinguishment. Extinguished waste material will then re-positioned for staging and eventual re-deposition. Excavation and ex-situ waste suppression will occur to approximately 10 feet deep into the waste pile within the footprint of the demonstration area(approximately 65 feet by 65 feet in dimension). Once ex-situ excavation and above-ground foam fire-suppression has been completed, a trial of in-situ foam fire extinguishment will be performed. Infiltration trenches will be excavated an additional 10-20 feet below the bottom of the existing excavation to facilitate downward penetration of the fire retardant foam into the underlying burning subsurface waste. Trenches will be developed with proper safety precautions and then filled with fire-retardant foam which is intended to penetrate into the underlying burning waste to extinguish combustion. Based on observations of foam infiltration effectiveness, the excavator will be utilized to the degree necessary to loosen waste material facilitating foam penetration. Once the in-situ foam suppression testing has been completed, the prior removed and foamed waste material will be re-deposited and compacted in the excavation. A 4-foot thick cover of crushed stone material will be placed above the re-buried waste as final cover. To assess the longer-term effectiveness of the fire-suppression demonstration project,underground temperatures will be monitored over time. Well points containing thermocouples will be placed within the demonstration site near the base of excavated material(and/or near the base of the constructed trenches and in-situ treated materials). Temperatures will be monitored periodically over several months to ERM 10 KAILUA-KONA LANDFILL/0061204-3/14/2008